CN107565725A - A Flux Compensated Surface Mount Slant Pole Rotor Structure - Google Patents

Abstract

The invention relates to a magnetic flux compensation surface-mounted oblique pole rotor structure, which comprises two non-magnetically conductive end plates (1), a heat dissipation ring (2), several sections of rotor cores (3), and several permanent magnets (4) and several magnetic pole fixing assemblies (5), several sections of rotor cores (3) are fastened on the cooling ring (2), and the outer surface of each section of rotor iron cores (3) is evenly distributed along the circumference with a number of the same number and the same size A permanent magnet (4), a magnetic pole fixing assembly (5) in the middle of two adjacent rotor cores (3), non-magnetic end plates (1) on both sides of the outer end of the rotor structure, and non-magnetic end plates (1) on both sides ) and heat dissipation ring (2) are fixed on the rotating shaft; the outer surface of each rotor core (3) is provided with dovetail grooves with the same number of poles, and the inner surface is provided with positioning grooves. The invention has the characteristics of magnetic flux compensation, easy inclination, strong heat dissipation capability and fast installation, and improves the applicable speed range of the surface-mounted permanent magnet motor.

Description

A Flux Compensated Surface Mount Slant Pole Rotor Structure

technical field

The invention relates to a surface-mounted permanent magnet motor rotor, in particular to a flux-compensated surface-mounted oblique pole rotor structure.

Background technique

The commonly used fixing method for surface-mounted permanent magnets is usually glue, which is combined with a non-weft-wrapped strap or metal sleeve, or screw fastening and dovetail groove limit methods. The above measures are prone to the following problems: the glue process is complicated and time-consuming Longer; no weft straps and metal sleeves occupy the air gap, which reduces the utilization rate of the permanent magnet and has the risk of bore sweeping, and the permanent magnet is likely to demagnetize when the metal sleeve is heated; the screw directly damages the permanent magnet, and a thinner magnetic pole is used for low power For the motor, the embedding of the screw has a great influence on the magnetic flux; the method of opening the dovetail groove of the rotor is more common, but it is easy to fail to achieve the required fixation for the motor with short axial length or the motor with chamfered permanent magnet. The strength reduces the speed range of the surface-mounted motor, and other fixing methods such as gluing reduce the advantages of the dovetail groove.

In addition, industrial servo motors have relatively high requirements on control accuracy and response time. Surface-mounted embedded motors have different AC and direct axis inductances, and the magnetic permeability of the air gap magnetic circuit is uneven. It is necessary to reduce the cogging torque with an oblique pole. There are two methods : The effect of continuous oblique poles is better, but the assembly process of the rotor punching is complicated, and the angle of the oblique poles and the continuity of the oblique poles are not easy to control; the segmented oblique poles need to process several rotor laminations with different relative angles, which are easy to assemble but During the processing process, the punching die opening mold needs to be adjusted several times, which is time-consuming. CN102355073 A simplifies the segmented oblique pole by adopting a punching sheet positive and negative lamination method, but the angle of the oblique pole is single, and it is difficult to realize the optimal design of the oblique pole angle; another convenience, in order to reduce the control response time of the servo motor, generally in the rotor punching The weight-reducing holes are opened on the chip to reduce the moment of inertia, and the process is complicated and the poor thermal conductivity of the air affects the heat dissipation of the rotor.

Contents of the invention

Based on the above deficiencies, the object of the present invention is to provide a magnetic flux compensation type surface mount inclined pole rotor structure with simple assembly and magnetic flux compensation after the inclined pole, which is suitable for industrial servo motors.

The technical solution of the present invention is: a magnetic flux compensation type surface-mounted oblique pole rotor structure, including two non-magnetic end plates, heat dissipation rings, several sections of rotor cores, several permanent magnets and several magnetic pole fixing components, several The segmented rotor cores are fastened to the cooling ring. Several permanent magnets of the same number and size are evenly distributed along the circumference of each segment of the rotor core. The magnetic pole fixing components are in the middle of the adjacent two segments of the rotor core. The outer end of the rotor structure There are non-magnetic end plates on both sides, and the non-magnetic end plates and cooling rings on both sides are fixed on the rotating shaft; the outer surface of each rotor core has dovetail grooves with the same number of poles, and the inner surface has positioning grooves.

The present invention also has the following technical features:

1. The number of positioning slots and slotting positions are determined according to the required oblique pole angle α; different sections of the rotor core realize segmented oblique poles.

2. The heat dissipation ring is made of non-magnetic material.

3. There are several weight-reducing holes on the heat dissipation ring.

4. The rotor core is formed by laminating a plurality of rotor punches.

5. The four side end faces of the permanent magnet parallel to the magnetization direction are all chamfered, the axial chamfering angle is matched with the non-magnetic end plate and the magnetic pole fixing assembly, and the circumferential chamfering angle is matched with the dovetail on the rotor core Groove fit.

6. The magnetic pole fixing assembly includes two magnetic pole pieces and a magnetic isolation plate. The magnetic isolation plate is fixed axially between the two magnetic pole pieces by several screws, and the screws are evenly distributed along the circumference. A limit slot is arranged at the same position of the inner diameter of the magnetic plate.

7. The magnetic pole piece and the rotor core in the magnetic pole fixing assembly are made of the same material, the magnetic isolation plate in the middle of the magnetic pole piece, the heat dissipation ring and the non-magnetic end plate are made of the same material, and the outer diameter of the magnetic pole fixing assembly is the same as Permanent magnets are the same.

8. The two non-magnetic end plates have the same structure. The non-magnetic end plates protrude two radially symmetrical positioning keys to the heat dissipation ring at the height of the rotating shaft. The outer diameter of the non-magnetic end plates is the same as that of the permanent magnet. The corner angle matches the axial chamfering angle of the permanent magnet, and the axial outer side adopts symmetrical chamfering.

The advantages of the present invention are: the permanent magnets are fixed on four sides closed, and are not limited by the size of the magnetic poles, and can resist greater centrifugal force and be applied at higher speeds; the axial permanent magnets are fixed with magnetically conductive materials, and the corresponding main air gap still exists Electromagnetic coupling realizes magnetic flux compensation, and at the same time, the magnetic isolation plate blocks the magnetic flux leakage between the poles and the eddy current path of the rotor core generated by the oblique poles; the rotor punching is exactly the same, and the process is simple. The axial outside of the end plate is chamfered, which acts as a wind thorn to accelerate the air flow, and at the same time facilitates the balance of the rotor. It has the characteristics of magnetic flux compensation, easy inclination, fast installation, strong heat dissipation, and high speed.

Description of drawings

Figure 1 is a schematic diagram of the rotor structure;

Fig. 2 is a schematic diagram of a permanent magnet;

Fig. 3 is the front view of Fig. 2;

Fig. 4 is a schematic diagram of a magnetic pole fixing assembly;

Fig. 5 is a side view of Fig. 4;

Figure 6 is a schematic diagram of rotor punching;

Fig. 7 is a schematic diagram of the cooling ring.

Explanation of reference signs

1. End cover, 2. Cooling ring, 2a. Lightening hole, 2b. Limit key, 3. Rotor core, 3a0. Reference limit key, 3a1. Incline pole a1° limit key, 3a2. Incline pole a2 °Limit key, 4. Permanent magnet, 5. Magnetic pole fixing component, 6. Shaft limit key, 7. Pressure ring, 5a. Magnetic pole shoe, 5b. Magnetic isolation plate, 5c. Limit slot, 5d. Screw hole , a1. Oblique angle a1°, a2. Oblique angle a2°.

detailed description

The present invention will be further described now in conjunction with accompanying drawing.

As shown in Figure 1, a magnetic flux compensation surface-mounted oblique rotor structure, including two non-magnetic end plates 1, heat dissipation ring 2, two-stage rotor core 3, several permanent magnets 4 and two fixed magnetic poles Component 5, two sections of rotor core 3 are fastened on the cooling ring 2, and the outer surface of each section of rotor core 3 is evenly distributed along the circumference with a number of permanent magnets 4 of the same number and size, and the middle of two adjacent sections of rotor core 3 It is a magnetic pole fixing component 5, and the two sides of the outer end of the rotor structure are non-magnetic end plates 1, and the non-magnetic end plates 1 and heat dissipation rings 2 on both sides are fixed on the rotating shaft; the outer surface of each rotor core 3 is provided with the same pole The number of dovetail grooves is counted, and the inner surface is provided with positioning grooves; different segments of the rotor core 3 realize segmented oblique poles. The permanent magnet is similar to a quadrangular truss fan.

The specific installation method is as follows: first fix the non-magnetic end plate 1 on the shaft limit key 6, and then heat-fix the heat dissipation ring 2 on the rotating shaft, the limit groove is matched with the limit key of the end plate, and after cooling Thermally fix the first rotor core 3 on the heat dissipation ring 2, insert the magnetized permanent magnet 4 and magnetic pole fixing assembly 5 along the circumference after cooling, thermally install the outer side of the first rotor core in the axial direction, and magnetically conduct pole shoes 5a matches the chamfer of the permanent magnet 4, and then assembles the second section of the rotor core in the same way as the first section. After all the iron core sections are assembled, axially buckle the end plate on the other side to ensure The bit key is inserted in the limit groove of the heat dissipation ring 2, and is pressed tightly with the pressure ring 7 at last. The inner diameter of the cooling ring 2 cooperates with the outer diameter of the rotating shaft, and the outer diameter cooperates with the inner diameter of the rotor iron core 3. In order to further reduce the moment of inertia, as shown in Figure 7, the cooling ring can also have weight-reducing holes. The heat dissipation ring can be made of the same non-magnetic material as the end plate and the magnetic isolation plate, which has better thermal conductivity and lower density, which is conducive to heat dissipation of the rotor and reduces the moment of inertia. Good material like white steel.

The four sides of the permanent magnet 4 are chamfered, as shown in Fig. 2 and Fig. 3, and the axial end is chamfered at 45° to ensure a certain fixing strength, so that the chamfered circumferential end can be optimally designed according to the air gap magnetic density waveform.

The non-magnetically conductive end plate protrudes two radially symmetrical positioning keys toward the heat dissipation ring at the height of the rotating shaft, the end plate has the same outer diameter as the permanent magnet, and the chamfering angle matches the axial chamfering angle of the permanent magnet. The axial outside is also chamfered.

The non-magnetic end plate 1 has two limit keys evenly distributed along the circumference, and its main purpose is to fix with the cooling ring 2 to prevent relative displacement in the circumferential direction. The size and number of limit keys can be determined according to the motor speed.

The rotor core 3 is formed by stacking rotor punches. The rotor punches are shown in Figure 6. According to the requirements of the oblique pole angle (such as non-inclined pole, oblique pole a1°, oblique pole a2°), etc., openings are made inside the punching sheet. Several limit grooves (such as 3a0, 3a1, 3a2), each punching sheet is exactly the same, no need to adjust the mold during stamping and lamination, when the rotor core 3 is assembled, the corresponding limit grooves of the iron cores at different positions and the cooling ring The only limit key 2b on the 2 cooperates to realize the oblique pole of the permanent magnet.

As shown in Fig. 4 and Fig. 5, the magnetic pole fixing assembly 5 includes two magnetic pole pieces 5a and a magnetic isolation plate 5b, and the magnetic isolation plate 5b is axially fixed on the two magnetic pole pieces 5a by several screws 5d. Between them, the screws 5d are evenly distributed along the circumferential direction, and a limiting groove 5c is formed at the same position on the inner diameter of the magnetically conductive pole piece 5a and the magnetically isolating plate 5b. Both sides of the magnetically conductive pole piece 5a with a chamfer of 45° can be made of the same material as the rotor core 3, and the magnetic isolation plate 5b is sandwiched in the middle, which can be made of the same material as the end plate 1 and heat dissipation ring 2, and the three are riveted into one The combination increases the strength of the component itself, and the number of rivets is the same as the number of poles, which are evenly distributed along the circumference.

Claims (9)

1. A magnetic flux compensation surface-mounted oblique rotor structure, including two non-magnetic end plates (1), heat dissipation ring (2), several sections of rotor core (3), several permanent magnets (4) and Several magnetic pole fixing assemblies (5), are characterized in that: several sections of rotor iron cores (3) are fastened on the cooling ring (2), and the outer surface of each section of rotor iron core (3) is evenly distributed along the circumference of several identical, Permanent magnets (4) of the same size, a magnetic pole fixing assembly (5) in the middle of two adjacent rotor cores (3), non-magnetic end plates (1) on both sides of the outer end of the rotor structure, and non-magnetic end plates (1) on both sides The plate (1) and the cooling ring (2) are fixed on the rotating shaft; the outer surface of each segment of the rotor core (3) is provided with dovetail grooves with the same number of poles, and the inner surface is provided with positioning grooves. 2. A magnetic flux compensation type surface-mounted oblique rotor structure according to claim 1, characterized in that: the number of positioning slots and slotting positions are determined according to the required oblique angle α; rotor cores of different sections (3 ) to realize segmented oblique poles. 3. The flux-compensated surface-mounted oblique rotor structure according to claim 1, characterized in that the heat dissipation ring (2) is made of non-magnetic material. 4. The flux-compensated surface-mounted oblique rotor structure according to claim 1, characterized in that: the heat dissipation ring (2) is provided with several weight-reducing holes (2a). 5. The magnetic flux compensation type surface-mounted skewed rotor structure according to claim 1, characterized in that: the rotor core (3) is formed by laminating a plurality of rotor punches. 6. The flux-compensated surface-mounted oblique rotor structure according to claim 1, characterized in that: the four side end faces of the permanent magnet (4) parallel to the magnetization direction are all chamfered, and the axial chamfer The angle matches the non-magnetic end plate (1) and the magnetic pole fixing assembly (5), and the circumferential chamfer angle matches the dovetail groove on the rotor core (3). 7. The magnetic flux compensation type surface-mounted skewed rotor structure according to claim 1, characterized in that: said magnetic pole fixing assembly (5) includes two magnetically conductive pole pieces (5a) and a magnetically isolating plate (5b) , the magnetic isolation plate (5b) is axially fixed between the two magnetic pole pieces (5a) by several screws (5d), the screws (5d) are evenly distributed along the circumference, the magnetically conductive pole piece (5a) and the magnetic isolation plate (5b ) has a limit slot (5c) at the same position as the inner diameter. 8. The flux-compensated surface-mounted oblique-pole rotor structure according to claim 1, characterized in that: the magnetic pole piece (5a) in the magnetic pole fixing assembly (5) is the same as the rotor core (3) Materials, the magnetic isolation plate (5b) in the middle of the magnetic pole piece (5a) is made of the same material as the cooling ring (2) and the non-magnetic end plate (1), and the outer diameter of the magnetic pole fixing component (5) is the same as that of the permanent magnet (4 )same. 9. The flux-compensated surface-mounted oblique rotor structure according to claim 1, characterized in that: the two non-magnetic end plates (1) have the same structure, and the non-magnetic end plates (1) face The cooling ring (2) protrudes two radially symmetrical positioning keys, the outer diameter of the non-magnetic end plate (1) is the same as that of the permanent magnet (4), and the chamfering angle is the same as the axial chamfer of the permanent magnet (4) Angle fit, symmetrical chamfering on the axial outer side.