CN207454554U - A kind of low power consumption permanent magnet biased decoupling magnetic bearing of Three Degree Of Freedom - Google Patents

Abstract

The utility model discloses a three-degree-of-freedom low-power permanent magnet bias decoupling magnetic bearing, which is mainly composed of a stator system and a rotor system. The stator system mainly includes: stator core, excitation coil, magnetic steel, stator iron Core support and stator end cover; the rotor system mainly includes: annular rotor laminations and turntable. The axial magnetic bearing stator parts described in the utility model need to be used in pairs in the same device, and can perform axial translation control and radial two-degree-of-freedom deflection control on the rotor. In addition, the utility model uses the permanent magnetic field generated by the magnetic steel as the bias magnetic field, and the electromagnetic field generated by the energized coil as the control magnetic field. The electromagnetic utilization rate further reduces the power consumption of the permanent magnet bias magnetic bearing.

Description

A three-degree-of-freedom low-power permanent magnet bias decoupling magnetic bearing

technical field

The utility model relates to a non-contact magnetic suspension bearing, in particular to a three-degree-of-freedom low-power permanent magnet bias decoupling magnetic bearing.

Background technique

According to the generation method of the bias magnetic field, the reluctance active magnetic bearing can be divided into a pure electromagnetic magnetic bearing and a permanent magnetic bias magnetic bearing. Stable suspension with high power consumption; the latter uses the permanent magnetic field generated by the magnetic steel as the bias magnetic field, and the electromagnetic field generated by the energized coil as the control magnetic field. The magnetic steel provides the main bearing capacity, and the control current provides the auxiliary control force. By controlling the electrification The control magnetic field generated by the control current in the coil and the bias magnetic field are superimposed forward/reversely to keep the magnetic density between each magnetic pole surface of the magnetic bearing and the rotor uniform, and to realize the non-contact stable suspension support of the rotor. Compared with pure electromagnetic magnetic bearings, the bias magnetic field in permanent magnet bias magnetic bearings does not consume electric energy, which greatly reduces the power consumption of magnetic bearing suspension, and is widely used in magnetic suspension inertial actuators, magnetic suspension motors, magnetic suspension blowers, magnetic suspension molecular pumps High speed equipment.

In the prior art, a low-power permanent magnet bias axial magnetic bearing described in Chinese patent 200510011272.2 adopts the second air gap scheme, so that most of the electromagnetic flux passes through the second air gap, and only a small part of the magnetic flux passes through The magnetic steel reduces the reluctance of the electromagnetic magnetic circuit and the power consumption of the levitation. The permanent magnet bias axial magnetic bearing described in the authorized patent 200710098748.X also adopts the second air gap scheme, so that most of the electromagnetic flux does not pass through the magnetic steel, which reduces the power consumption of the bearing suspension. Most of the electromagnetic flux of the above-mentioned permanent magnet bias magnetic bearing passes through the second air gap, but a small part flows through the magnetic steel, so the decoupling of the permanent magnet and the electromagnetic is not realized in a real sense.

Utility model content

The purpose of the utility model is to provide a three-degree-of-freedom low-power permanent magnet bias decoupling magnetic bearing which completely decouples the permanent magnet magnetic circuit and the electromagnetic magnetic circuit.

The purpose of this utility model is achieved by the following technical solutions:

The preferred embodiment of the three-degree-of-freedom low-power permanent magnet bias decoupling magnetic bearing of the present invention is:

It is mainly composed of stator system and rotor system. The stator system mainly includes: left stator core, right stator core, front stator core, rear stator core, excitation coil, left front magnet, left rear magnet, right front magnet Steel, right rear magnetic steel, stator core bracket and stator end cover; the rotor system mainly includes: annular rotor laminations and turntable; the left stator core contains two stator poles in the +X direction, and the right stator core contains -X Two stator poles in the direction, the front stator core contains two stator poles in the +Y direction, the rear stator core contains two stator poles in the -Y direction, the left stator core, the right stator core, the front stator The core 1C and the rear stator core form 8 stator poles in the circumferential direction of the magnetic bearing, and the excitation coil 2 is wound on the 8 stator poles of the left stator core, right stator core, front stator core and rear stator core , and cured on the 8 stator poles of the left stator core, right stator core, front stator core and rear stator core by epoxy resin glue, the left stator core, right stator core, front stator core and The rear stator core is placed orthogonally in the circumferential direction of the magnetic bearing, and is located on the +X, -X, +Y, -Y axes respectively. The left front magnet is located between the left stator core and the front stator core, and the left rear magnet Located between the left stator core and the rear stator core, the right front magnetic steel is located between the right stator core and the front stator core, the right rear magnetic steel is located between the right stator core and the rear stator core, the stator core support Located on the axial upper side of the left stator core, right stator core, front stator core, rear stator core, left front magnet, left rear magnet, right front magnet and right rear magnet, the two The two stator poles pass through the two through holes in the +X direction on the stator core support, the two stator poles on the right stator core pass through the two through holes in the -X direction on the stator core support, and the front stator iron The two stator poles on the core pass through the two through holes in the +Y direction on the stator core support, and the two stator poles on the rear stator core pass through the two through holes in the -Y direction on the stator core support. The left stator core, the right stator core, the front stator core, the rear stator core, the left front magnet, the left rear magnet, the right front magnet and the right rear magnet are located on the radial inner side of the outer wall of the stator end cover and the stator core On the radial outside of the inner wall of the bracket, the left stator core, right stator core, front stator core, rear stator core, left front magnet, left rear magnet, right front magnet, right rear magnet and stator core support pass The fastening screws are fixed on the stator end cover, the annular rotor laminations are located in the annular groove of the turntable, and are cured on the turntable by epoxy resin glue, the upper surface of the two stator poles on the left stator core, and the upper surface of the right stator core There is air between the upper surfaces of the two stator poles on the upper surface, the upper surfaces of the two stator poles on the front stator core, the upper surfaces of the two stator poles on the rear stator core and the end surfaces of the annular rotor laminations. Gap.

It can be seen from the technical solution provided by the above-mentioned utility model that the three-degree-of-freedom low-power permanent magnet bias decoupling magnetic bearing provided by the embodiment of the utility model fully decouples the permanent magnet magnetic circuit from the electromagnetic magnetic circuit, which improves the electromagnetic The utilization rate of the magnetic flux reduces the levitation power consumption of the magnetic bearing, and can be used as a non-contact support for rotor components in the inertial actuators of spacecraft such as magnetic levitation flywheels.

Description of drawings

Fig. 1 is a schematic structural diagram of a three-degree-of-freedom low-power permanent magnet bias decoupling magnetic bearing provided by an embodiment of the present invention.

Fig. 2 is an axial partial cross-sectional view of the three-degree-of-freedom low-power permanent magnet bias decoupling magnetic bearing provided by the embodiment of the utility model;

Figure 3a is a top view of the stator system in the embodiment of the utility model;

Fig. 3b is a partial sectional view of the stator system in the embodiment of the present invention;

Fig. 4 is a sectional view of the rotor system in the embodiment of the present invention;

Fig. 5 is a three-dimensional structure diagram of the left stator core, the right stator core, the front stator core and the rear stator core in the embodiment of the utility model;

Fig. 6a is a cross-sectional view of the stator core support in the embodiment of the present invention;

Fig. 6b is a three-dimensional structural schematic diagram of the stator core support in the embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. . Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present utility model.

The preferred embodiment of the three-degree-of-freedom low-power permanent magnet bias decoupling magnetic bearing of the present invention is:

It is mainly composed of stator system and rotor system. The stator system mainly includes: left stator core, right stator core, front stator core, rear stator core, excitation coil, left front magnet, left rear magnet, right front magnet Steel, right rear magnetic steel, stator core bracket and stator end cover; the rotor system mainly includes: annular rotor laminations and turntable; the left stator core contains two stator poles in the +X direction, and the right stator core contains -X Two stator poles in the direction, the front stator core contains two stator poles in the +Y direction, the rear stator core contains two stator poles in the -Y direction, the left stator core, the right stator core, the front stator The core 1C and the rear stator core form 8 stator poles in the circumferential direction of the magnetic bearing, and the excitation coil 2 is wound on the 8 stator poles of the left stator core, right stator core, front stator core and rear stator core , and cured on the 8 stator poles of the left stator core, right stator core, front stator core and rear stator core by epoxy resin glue, the left stator core, right stator core, front stator core and The rear stator core is placed orthogonally in the circumferential direction of the magnetic bearing, and is located on the +X, -X, +Y, -Y axes respectively. The left front magnet is located between the left stator core and the front stator core, and the left rear magnet Located between the left stator core and the rear stator core, the right front magnetic steel is located between the right stator core and the front stator core, the right rear magnetic steel is located between the right stator core and the rear stator core, the stator core support Located on the axial upper side of the left stator core, right stator core, front stator core, rear stator core, left front magnet, left rear magnet, right front magnet and right rear magnet, the two The two stator poles pass through the two through holes in the +X direction on the stator core support, the two stator poles on the right stator core pass through the two through holes in the -X direction on the stator core support, and the front stator iron The two stator poles on the core pass through the two through holes in the +Y direction on the stator core support, and the two stator poles on the rear stator core pass through the two through holes in the -Y direction on the stator core support. The left stator core, the right stator core, the front stator core, the rear stator core, the left front magnet, the left rear magnet, the right front magnet and the right rear magnet are located on the radial inner side of the outer wall of the stator end cover and the stator core The radial outside of the inner wall of the bracket, the left stator core, right stator core, front stator core, rear stator core, left front magnet, left rear magnet, right front magnet, right rear magnet and stator core support pass The fastening screws are fixed on the stator end cover. The annular rotor laminations are located in the annular groove of the turntable and are cured on the turntable by epoxy resin. The upper surface of the two stator poles on the left stator core and the right stator core There is air between the upper surfaces of the two stator poles on the upper surface, the upper surfaces of the two stator poles on the front stator core, the upper surfaces of the two stator poles on the rear stator core and the end surfaces of the annular rotor laminations. Gap.

The left stator core, the right stator core, the front stator core and the rear stator core are all made of any one of 1J22 rods or electrical pure iron. The left front magnet, the left rear magnet, the right front magnet and the right rear magnet are all hard magnetic materials of neodymium-iron-boron alloy or cobalt-cobalt alloy, and they are all magnetized in parallel in the circumferential direction, and the magnetization directions are as follows: left Back S right front N, left front S right back N, left front N right back S, left back N right front S or left back N right front S, left front N right back S, left front S right back N, left back S right front N. The stator core support and the stator end cover are both hard aluminum alloy 2A12 or superhard aluminum alloy 7A09 bar materials with good thermal conductivity. The annular rotor laminations are 1J22 or 1J50 lamination materials with a thickness of 0.1mm, and the lamination direction is radial. The axial magnetic bearing stator parts need to be used in pairs in the same device, and can perform axial translation control and radial three-degree-of-freedom deflection control on the rotor.

The principle of the above scheme is:

The permanent magnetic field generated by the magnetic steel is used as the bias magnetic field, and the electromagnetic field generated by the energized coil is used as the control magnetic field. The magnetic steel provides the main bearing capacity, and the control current provides the auxiliary control force. By controlling the control magnetic field generated by the control current in the energized coil and the bias The magnetic field is superposed in the forward/reverse direction to keep the magnetic density between each magnetic pole surface of the magnetic bearing and the rotor uniform, and to realize the non-contact stable suspension support of the rotor. As shown by the solid line in Figure 1 and Figure 2, the front-end electromagnetic magnetic circuit of the utility model is: the magnetic flux starts from the front magnetic pole of the left stator core, passes through the air gap, the annular rotor laminations, the air gap and the left stator core The rear magnetic pole of the front stator core returns to the front magnetic pole of the front stator core to form a closed loop; the electromagnetic magnetic circuit at the right end is: the magnetic flux starts from the front magnetic pole of the right stator core, passes through the air gap, annular rotor laminations, air gap and right stator iron The rear magnetic pole of the core returns to the front magnetic pole of the right stator core to form a closed loop; the front-end electromagnetic magnetic circuit is: the magnetic flux starts from the left magnetic pole of the front stator core, passes through the air gap, annular rotor laminations, air gap and front stator iron The right magnetic pole of the core returns to the left magnetic pole of the front stator core to form a closed loop; the rear end electromagnetic magnetic circuit is: the magnetic flux starts from the left magnetic pole of the rear stator core, passes through the air gap, annular rotor laminations, air gap and rear The right magnetic pole of the stator iron core and the right magnetic pole of the stator iron core after returning form a closed loop; the dotted line shows the permanent magnet magnetic circuit, and the permanent magnet magnetic circuit at the left front end is: the magnetic flux starts from the N pole of the left front magnetic steel and passes through the front The right magnetic pole of the stator core, the air gap, the annular rotor laminations, the air gap and the front magnetic pole of the left stator core return to the S pole of the left front magnetic steel to form a closed loop; the permanent magnet magnetic circuit at the left rear end is: the magnetic flux from Starting from the N pole of the left rear magnet, passing through the left magnetic pole of the rear stator core, the air gap, the annular rotor laminations, the air gap and the rear magnetic pole of the left stator core, returning to the S pole of the left front magnet to form a closed loop; The front permanent magnet magnetic circuit is: the magnetic flux starts from the N pole of the right front magnet, passes through the right magnetic pole of the front stator core, the air gap, the annular rotor laminations, the air gap and the front magnetic pole of the right stator core, and returns to the right front magnet. The S pole of the steel forms a closed loop; the permanent magnet magnetic circuit at the right rear end is: the magnetic flux starts from the N pole of the right rear magnetic steel, passes through the right magnetic pole of the rear stator core, the air gap, the annular rotor laminations, the air gap and the right The rear magnetic pole of the stator core returns to the S pole of the right rear magnetic steel to form a closed loop; the electromagnetic magnetic circuit of the utility model does not pass through the magnetic steel, which reduces the reluctance of the electromagnetic magnetic circuit, reduces the reluctance loss and the power consumption of the magnetic bearing .

Compared with the prior art, the utility model has the following advantages:

The utility model uses the permanent magnet magnetic field generated by the magnetic steel as the bias magnetic field, and the electromagnetic magnetic field generated by the energized coil as the control magnetic field. rate, further reducing the permanent magnet bias magnetic bearing power consumption.

Specific examples:

As shown in Figures 1 and 2, a three-degree-of-freedom low-power permanent magnet bias decoupling magnetic bearing is mainly composed of a stator system and a rotor system. The stator system mainly includes: left stator core 1A, right stator iron core Core 1B, front stator core 1C, rear stator core 1D, excitation coil 2, left front magnet 3A, left rear magnet 3B, right front magnet 3C, right rear magnet 3D, stator core bracket 4 and stator end cover 5. The rotor system mainly includes: annular rotor laminations 6 and turntable 7; the left stator core 1A contains two stator poles in the +X direction, the right stator core 1B contains two stator poles in the -X direction, and the front stator Iron core 1C contains two stator poles in +Y direction, rear stator core 1D contains two stator poles in -Y direction, left stator core 1A, right stator core 1B, front stator core 1C and rear stator core The iron core 1D forms 8 stator poles in the circumferential direction of the magnetic bearing, and the excitation coil 2 is wound on the 8 stator poles of the left stator core 1A, the right stator core 1B, the front stator core 1C and the rear stator core 1D, And cured on the 8 stator magnetic poles of left stator core 1A, right stator core 1B, front stator core 1C and rear stator core 1D through epoxy resin glue, left stator core 1A, right stator core 1B, The front stator core 1C and the rear stator core 1D are placed orthogonally in the circumferential direction of the magnetic bearing, respectively located on the +X, -X, +Y, -Y axes, and the left front magnetic steel 3A is located on the left stator core 1A and the front stator Between the iron core 1C, the left rear magnet 3B is located between the left stator core 1A and the rear stator core 1D, the right front magnet 3C is located between the right stator core 1B and the front stator core 1C, and the right rear magnet 3D Located between the right stator core 1B and the rear stator core 1D, the stator core support 4 is located between the left stator core 1A, the right stator core 1B, the front stator core 1C, the rear stator core 1D, the left front magnetic steel 3A, The left rear magnetic steel 3B, the right front magnetic steel 3C and the right rear magnetic steel 3D are axially upward, and the two stator magnetic poles on the left stator core 1A pass through the two through holes in the +X direction on the stator core support 4, The two stator poles on the right stator core 1B pass through the two through holes in the -X direction on the stator core support 4, and the two stator poles on the front stator core 1C pass through the two through holes on the stator core support 4. Through holes in the +Y direction, the two stator poles on the rear stator core 1D pass through the two through holes in the -Y direction on the stator core support 4, the left stator core 1A, the right stator core 1B, the front stator Iron core 1C, rear stator iron core 1D, left front magnet steel 3A, left rear magnet steel 3B, right front magnet steel 3C and right rear magnet steel 3D are located at the radial inner side of the outer wall of the stator end cover 5 and the diameter of the inner wall of the stator core support 4. To the outside, left stator core 1A, right stator core 1B, front stator core 1C, rear stator core 1D, left front magnet 3A, left rear magnet 3B, right front magnet 3C, right rear magnet 3D and stator The iron core bracket 4 is fixedly installed on the stator end cover 5 by fastening screws, the annular rotor laminations 6 are located in the annular groove of the turntable 7, and are cured on the turntable 7 by epoxy resin glue, the two on the left stator core 1A Certainly The upper surfaces of the sub poles, the upper surfaces of the two stator poles on the right stator core 1B, the upper surfaces of the two stator poles on the front stator core 1C and the upper surfaces of the two stator poles on the rear stator core 1D An air gap 8 is left between the end faces of the annular rotor laminations 6 .

Fig. 3a is a top view of the stator system in the utility model, and Fig. 3b is a partial cross-sectional view of the stator system in the utility model, the left stator core 1A contains two stator poles in the +X direction, and the right stator core 1B contains the -X direction The two stator poles on the top, the front stator core 1C contains two stator poles in the +Y direction, the rear stator core 1D contains two stator poles in the -Y direction, the left stator core 1A, the right stator core 1B , the front stator core 1C and the rear stator core 1D form 8 stator poles in the circumferential direction of the magnetic bearing, and the excitation coil 2 is wound on the left stator core 1A, the right stator core 1B, the front stator core 1C and the rear stator core 8 stator poles of core 1D, and cured by epoxy resin on 8 stator poles of left stator core 1A, right stator core 1B, front stator core 1C and rear stator core 1D, left stator core Core 1A, right stator core 1B, front stator core 1C and rear stator core 1D are placed orthogonally in the circumferential direction of the magnetic bearing, respectively on the +X, -X, +Y, -Y axes, and the left front magnetic steel 3A Located between the left stator core 1A and the front stator core 1C, the left rear magnet 3B is located between the left stator core 1A and the rear stator core 1D, and the right front magnet 3C is located between the right stator core 1B and the front stator core Between 1C, the right rear magnetic steel 3D is located between the right stator core 1B and the rear stator core 1D, and the stator core support 4 is located between the left stator core 1A, the right stator core 1B, the front stator core 1C, and the rear stator core Iron core 1D, left front magnetic steel 3A, left rear magnetic steel 3B, right front magnetic steel 3C and right rear magnetic steel 3D are axially upward, and the two stator magnetic poles on the left stator core 1A pass through the two poles on the stator core support 4. Two through holes in the +X direction, the two stator poles on the right stator core 1B pass through the two through holes in the -X direction on the stator core support 4, and the two stator poles on the front stator core 1C pass through Through the two through holes in the +Y direction on the stator core support 4, the two stator poles on the rear stator core 1D pass through the two through holes in the -Y direction on the stator core support 4, and the left stator core 1A , the right stator core 1B, the front stator core 1C, the rear stator core 1D, the left front magnet 3A, the left rear magnet 3B, the right front magnet 3C and the right rear magnet 3D are located on the radial inner side of the outer wall of the stator end cover 5 And the radial outside of the inner wall of stator core support 4, left stator core 1A, right stator core 1B, front stator core 1C, rear stator core 1D, left front magnet 3A, left rear magnet 3B, right front magnet 3C, the right rear magnetic steel 3D and the stator core support 4 are fixedly installed on the stator end cover 5 by fastening screws.

Figure 4 is a cross-sectional view of the rotor assembly of the technical solution of the present invention. The rotor part mainly includes: annular rotor laminations 6 and a turntable 7. The annular rotor laminations 6 are located in the annular groove of the turntable 7 and are cured on the turntable by epoxy resin glue. 7 on. The annular rotor laminations 6 are 1J22 or 1J50 lamination materials with a thickness of 0.1 mm, the lamination direction is radial, and the turntable 7 is a hard aluminum alloy 2A12 or superhard aluminum alloy 7A09 rod material with good thermal conductivity .

Fig. 5 is a three-dimensional structural schematic diagram of the left stator core 1A, the right stator core 1B, the front stator core 1C and the rear stator core 1D of the technical solution of the utility model. The left stator core 1A contains two stator poles in the +X direction, the right stator core 1B contains two stator poles in the -X direction, the front stator core 1C contains two stator poles in the +Y direction, and the rear stator core 1B contains two stator poles in the +Y direction. The iron core 1D contains two stator magnetic poles in the -Y direction. The left stator iron core 1A, the right stator iron core 1B, the front stator iron core 1C and the rear stator iron core 1D form 8 stator magnetic poles in the circumferential direction of the magnetic bearing. The excitation coil 2 is wound on each stator pole, and the left stator core 1A, right stator core 1B, front stator core 1C and rear stator core 1D are evenly placed in the circumferential direction of the magnetic bearing, and 1J22 rods with strong magnetic permeability are used. It is made of either material or electrical pure iron.

Figure 6b is a three-dimensional structural schematic diagram of the stator core support 4 of the technical solution of the present invention; the stator core support 4 contains 8 circumferentially distributed on both sides of the +X, -X, +Y, and -Y axes Through holes are used for the positioning of left stator core 1A, right stator core 1B, front stator core 1C and rear stator core 1D. The stator core support (4) is duralumin alloy 2A12 or super Hard aluminum alloy 7A09 bar material.

The contents not described in detail in the description of the utility model belong to the prior art known to those skilled in the art.

The above is only a preferred embodiment of the utility model, but the scope of protection of the utility model is not limited thereto, and any person familiar with the technical field can easily think of All changes or replacements should fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (5)

1. A three-degree-of-freedom low-power permanent magnet bias decoupling magnetic bearing, mainly composed of a stator system and a rotor system, is characterized in that: The stator system mainly includes: left stator core (1A), right stator core (1B), front stator core (1C), rear stator core (1D), excitation coil (2), left front magnet (3A ), left rear magnet (3B), right front magnet (3C), right rear magnet (3D), stator core support (4) and stator end cover (5); The rotor system mainly includes: annular rotor laminations (6) and a turntable (7); The left stator core (1A) contains two stator poles in the +X direction, the right stator core (1B) contains two stator poles in the -X direction, and the front stator core (1C) contains two stator poles in the +Y direction. The two stator poles of the rear stator core (1D) contain two stator poles in the -Y direction, the left stator core (1A), the right stator core (1B), the front stator core (1C) and the rear stator core The iron core (1D) forms 8 stator poles in the circumferential direction of the magnetic bearing, and the excitation coil (2) is wound on the left stator core (1A), the right stator core (1B), the front stator core (1C) and the rear stator on the 8 stator poles of the core (1D), and cured on the left stator core (1A), right stator core (1B), front stator core (1C) and rear stator core (1D) by epoxy glue ), the left stator core (1A), the right stator core (1B), the front stator core (1C) and the rear stator core (1D) are placed orthogonally in the circumferential direction of the magnetic bearing, respectively Located on the +X, -X, +Y, -Y axes, the left front magnet (3A) is located between the left stator core (1A) and the front stator core (1C), and the left rear magnet (3B) is located in the left stator Between the iron core (1A) and the rear stator core (1D), the right front magnet (3C) is located between the right stator core (1B) and the front stator core (1C), and the right rear magnet (3D) is located on the right Between the stator core (1B) and the rear stator core (1D), the stator core support (4) is located at the left stator core (1A), right stator core (1B), front stator core (1C), rear The axial upper part of stator core (1D), left front magnet (3A), left rear magnet (3B), right front magnet (3C) and right rear magnet (3D), left stator core (1A) The two stator poles pass through the two through holes in the +X direction on the stator core support (4), and the two stator poles on the right stator core (1B) pass through the two through holes on the stator core support (4). Through holes in the -X direction, the two stator poles on the front stator core (1C) pass through the two through holes in the +Y direction on the stator core support (4), and the two through holes on the rear stator core (1D) A stator pole passes through two through holes in the -Y direction on the stator core support (4), the left stator core (1A), the right stator core (1B), the front stator core (1C), and the rear stator core (1D), the left front magnet (3A), the left rear magnet (3B), the right front magnet (3C) and the right rear magnet (3D) are located on the radial inner side of the outer wall of the stator end cover (5) and the stator core support (4) Radially outside the inner wall, left stator core (1A), right stator core (1B), front stator core (1C), rear stator core (1D), left front magnet (3A), left rear The magnet (3B), the right front magnet (3C), the right rear magnet (3D) and the stator core support (4) are fixed on the stator end cover (5) by fastening screws, and the annular rotor laminations (6) Located in the annular groove of the turntable (7), and cured on the turntable (7) by epoxy resin glue, the upper surface of the two stator poles on the left stator core (1A), the right stator The upper surfaces of the two stator poles on the iron core (1B), the upper surfaces of the two stator poles on the front stator core (1C) and the upper surfaces of the two stator poles on the rear stator core (1D) and the ring An air gap (8) is left between the end faces of the rotor laminations (6). 2. The three-degree-of-freedom low-power permanent magnet bias decoupling magnetic bearing according to claim 1, characterized in that: the left stator core (1A), the right stator core (1B), the front stator core Both the core (1C) and the rear stator core (1D) are made of any one of 1J22 rods or pure electrical iron. 3. The three-degree-of-freedom low-power permanent magnet bias decoupling magnetic bearing according to claim 1 is characterized in that: the left front magnet (3A), the left rear magnet (3B), the right front magnet ( 3C) and the right rear magnet (3D) are both neodymium-iron-boron alloy or shirt-cobalt alloy hard magnetic materials, and they are all magnetized in parallel in the circumferential direction. The magnetization directions are: left rear S right front N, left front S right rear N , Left Front N Right Back S, Left Back N Right Front S or Left Back N Right Front S, Left Front N Right Back S, Left Front S Right Back N, Left Back S Right Front N. 4. The three-degree-of-freedom low-power permanent-magnet bias decoupling magnetic bearing according to claim 1, characterized in that: the stator core support (4) and the stator end cover (5) are both relatively high thermal conductivity Good duralumin 2A12 or super duralumin 7A09 bar material. 5. The three-degree-of-freedom low-power permanent magnet bias decoupling magnetic bearing according to claim 1, characterized in that: the annular rotor laminations (6) are 1J22 or 1J50 lamination materials with a thickness of 0.1mm , the lamination direction is radial.