CN106953430B - High Power Density Motor - Google Patents

Abstract

The invention discloses a high power density motor, which includes a casing, a rotor and a stator; the stator core includes several first sections and several second sections, and each first section includes several first stators. Each second section includes a stator yoke and several second stator teeth, the first stator teeth and the second stator teeth are arranged in one-to-one correspondence, and the corresponding first stator teeth and the second stator teeth coincide with the axial direction of the stator core; there are several stator slots on the stator core, and a heat conduction plate is arranged at the bottom of each stator slot, and each heat conduction plate is provided with several heat conduction teeth, A heat conduction ring is arranged between any two adjacent first sections and second sections, the outer periphery of each heat conduction ring is in contact with the inner wall of the casing, and the inner periphery of each heat conduction ring is in contact with each heat conduction ring. Plate contact, heat conduction plate, heat conduction tooth and heat conduction ring are all made of heat conduction material. The heat dissipation effect of the present invention is better.

Description

High Power Density Motor

technical field

The invention relates to the field of motors, in particular to a high power density motor.

Background technique

In the fields of modern transportation, high-end manufacturing equipment, aerospace, distributed energy supply systems and advanced household appliances, the requirements for the performance and reliability of related drive systems are increasing, while some high-end equipment require high-performance motors and their control systems. High power density and strong fault tolerance are required. For high-power-density and ultra-high-power-density motors, their operation is close to the limit of heat dissipation and mechanical strength. How to increase the power density of the motor while ensuring the thermal stability and fault tolerance of the system has become a key issue and challenge for high-performance motor design.

Contents of the invention

The technical problem to be solved by the present invention is to provide a high power density motor with better heat dissipation effect.

In order to solve the above-mentioned technical problems, the high power density motor provided by the present invention includes a casing, a rotor and a stator;

Stator core and stator winding, the stator core includes several first sections and several second sections, the first section and the second section are distributed along the axial direction of the stator core at intervals, and each first section includes several a plurality of first stator teeth distributed circumferentially around the axis of the stator core at intervals, each second section includes a stator yoke and several second stator teeth distributed circumferentially around the axis of the stator core at intervals, the first The stator teeth and the second stator teeth are arranged in one-to-one correspondence, and the corresponding first stator teeth and the second stator teeth are all coincident along the axial direction of the stator core;

There are several stator slots on the stator core, and a heat conduction plate is arranged at the bottom of each stator slot, and each heat conduction plate extends along the axial direction of the stator core, and each heat conduction plate is provided with several heat conduction teeth, any phase A heat conduction ring is arranged between the two adjacent first sections and the second section, the outer periphery of each heat conduction ring is in contact with the inner wall of the casing, and the inner periphery of each heat conduction ring is in contact with each heat conduction plate , the heat conduction plate, heat conduction tooth and heat conduction ring are all made of heat conduction material.

Preferably, the stator winding includes a main winding and an auxiliary winding, the main winding is a concentrated winding, the main winding wraps around the first stator teeth and the second stator teeth, the auxiliary winding is a distributed winding, and the auxiliary winding wraps around on the heat transfer tooth.

Preferably, the axial length of the first section of the stator core is much smaller than the axial length of the second section.

As a preference, the plurality of heat-conducting teeth on each heat-conducting plate are arranged as a plurality of tooth rows, and the plurality of tooth rows are arranged at intervals along the width direction of the heat-conducting plate, and the heat-conducting teeth in each tooth row are arranged along the length direction of the heat-conducting plate Arranged at intervals.

As a preference, a water cooling channel is arranged in the casing.

After adopting the above structure, compared with the prior art, the present invention has the following advantages:

In the motor of the present invention, since a heat conduction plate is arranged in the stator slot, and heat conduction teeth are arranged on the heat conduction plate, the outer periphery of the heat conduction ring is in contact with the inner wall of the casing, and the inner periphery of the heat conduction ring is in contact with each heat conduction plate, thus, The heat generated when the motor is running can be conducted axially through the heat-conducting teeth and the heat-conducting plate in turn, and the heat on the heat-conducting plate can be conducted radially through the heat-conducting ring. The heat conduction ring conducts to the casing quickly, and then the casing dissipates heat into the air through the water cooling channel, so that the heat dissipation efficiency of the present invention is relatively high.

The motor of the present invention is provided with a main winding and an auxiliary winding, and a high-frequency small current under a certain control strategy is passed through the auxiliary winding to generate a high-frequency harmonic magnetic field, and the magnetic field generated by the original main winding is compensated and modulated, The quality of the air-gap magnetic field is greatly improved through magnetic field synthesis, thereby reducing the frequency of the power current flowing through the main winding, reducing the switching frequency and loss of the main winding inverter power supply device, and improving system reliability; and it is possible to set the main winding and auxiliary winding. The fault-tolerant operation control strategy can quickly rebuild and restore the balanced magnetic field when a fault occurs, and give full play to the different functions of the auxiliary winding in normal operation and fault operation.

Description of drawings

Fig. 1 is a sectional view of the present invention;

Fig. 2 is A-A to sectional view among Fig. 1;

Fig. 3 is B-B direction sectional view among Fig. 1;

Fig. 4 is a structural schematic diagram of an assembly composed of a heat conducting plate, a heat conducting tooth and a heat conducting ring;

Fig. 5 is a cross-sectional view of an assembly composed of a heat conducting plate, a heat conducting tooth and a heat conducting ring.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in FIGS. 1 to 5 , the high power density motor of the present invention includes a casing 1 , a rotor 2 , a stator 3 and a motor shaft 9 .

The stator 3 includes a stator core and a stator winding. The stator core includes several first sections and several second sections. The first sections and the second sections are distributed at intervals along the axial direction of the stator core. The diameter is small, and each first section includes several first stator teeth 301 that are spaced circumferentially around the axis of the stator core, and the outer diameter of the second section is larger, and each second section includes The stator yoke 302 and a number of second stator teeth 303 distributed circumferentially around the axis of the stator core at intervals, the first stator teeth 301 and the second stator teeth 303 are provided in one-to-one correspondence, and the corresponding first stator Both the tooth portion 301 and the second stator tooth portion 302 overlap along the axial direction of the stator core.

There are several stator slots 304 on the stator core, and a heat conduction plate 4 is arranged at the bottom of each stator slot 304, and each heat conduction plate 4 extends along the axial direction of the stator core, and each heat conduction plate 4 is provided with several The heat conduction tooth 5, the heat conduction tooth 5 is located in the stator slot 304, a heat conduction ring 6 is arranged between any two adjacent first sections and the second section, and the outer periphery of each heat conduction ring 6 is connected with the casing 1 Inner wall contact, the inner periphery of each heat conduction ring 6 is in contact with each heat conduction plate 4, the heat conduction plate 4, heat conduction teeth 5 and heat conduction ring 6 are all made of heat conduction materials, and the heat conduction teeth 5 on each heat conduction plate 4 are It is integrally formed with the heat conduction plate 4 , and all the heat conduction plates 4 are integrally formed with all the heat conduction rings 6 .

The stator winding includes a main winding 7 and an auxiliary winding 8, the main winding 7 is a concentrated winding, the main winding 7 is wound around the first stator tooth portion 301 and the second stator tooth portion 302, and the auxiliary winding 8 is a distributed winding , the auxiliary winding 8 wraps around the heat conducting teeth 5 .

The axial length of the first section of the stator core is much smaller than the axial length of the second section.

Several heat conduction teeth 5 on each heat conduction plate 4 are arranged as a plurality of tooth rows, and the plurality of tooth rows are arranged at intervals along the width direction of the heat conduction plate 4, and the heat conduction teeth 5 in each tooth row are arranged along the width direction of the heat conduction plate 4. Arranged at intervals along the length direction.

The casing 1 is provided with a water cooling channel 101 .

When the motor is working normally, a high-frequency and small current under a certain control strategy is passed through the auxiliary winding 8 through the high-frequency low-power controller C2 to generate a high-frequency harmonic magnetic field; through the low-frequency high-power controller C1, the main winding 7 is passed through The power current is used to generate energy to convert the main magnetic field; the high-frequency harmonic magnetic field compensates and modulates the main magnetic field, and the quality of the air-gap magnetic field is greatly improved through magnetic field synthesis, thereby reducing the additional iron loss of the stator core and the loss of the rotor.

When the motor is open-circuited or short-circuited, the high-frequency low-power controller C2 passes through the auxiliary winding 8 under the time-frequency control strategy of the active filter effect to follow the compensation current to generate an auxiliary magnetic field, accompanied by compensation for the gas caused by the failure of the main winding 7. Gap magnetic field distortion, re-establish a balanced magnetic field, to ensure a certain working ability in the case of motor failure.

The above is only a description of the preferred examples of the application of the present invention, but it should not be construed as a limitation on the claims. The structure of the present invention can have other changes and is not limited to the above structure. In a word, all the various changes made within the protection scope of the independent claims of the present invention are within the protection scope of the present invention.

Claims (4)

1. A high power density motor is characterized in that it comprises a casing (1), a rotor (2) and a stator (3); The stator (3) includes a stator core and a stator winding. The stator core includes several first sections and several second sections. The first sections and the second sections are distributed along the axial direction of the stator core at intervals. Each first The segments each include a plurality of first stator teeth (301) distributed at intervals around the axis of the stator core, and each second segment includes a stator yoke (302) and several circumferential teeth around the axis of the stator core. The second stator teeth (303) distributed at intervals, the first stator teeth (301) and the second stator teeth (303) are provided in one-to-one correspondence, and the corresponding first stator teeth (301) and the second The stator teeth (303) all overlap along the axial direction of the stator core; There are several stator slots (304) on the stator core, and a heat conduction plate (4) is arranged at the bottom of each stator slot (304), each heat conduction plate (4) extends along the axial direction of the stator core, and each heat conduction plate (4) A plurality of heat conducting teeth (5) are arranged on each plate (4), and a heat conducting ring (6) is arranged between any two adjacent first sections and second sections, and the outer circumference of each heat conducting ring (6) The edge is in contact with the inner wall of the casing (1), and the inner periphery of each heat conduction ring (6) is in contact with each heat conduction plate (4). The heat conduction plate (4), heat conduction teeth (5) and heat conduction ring (6) ) are made of heat-conducting materials; the heat-conducting teeth (5) on each heat-conducting plate (4) are integrated with the heat-conducting plate (4), and all heat-conducting plates (4) are integrally formed with all heat-conducting rings (6) ; The stator winding includes a main winding (7) and an auxiliary winding (8), the main winding (7) is a concentrated winding, and the main winding (7) surrounds the first stator tooth (301) and the second stator tooth (303) Above, the auxiliary winding (8) is a distributed winding, and the auxiliary winding (8) wraps around the heat conducting tooth (5). 2. The high power density motor according to claim 1, characterized in that: the axial length of the first section of the stator core is much smaller than the axial length of the second section. 3. The high power density motor according to claim 1, characterized in that: several heat conduction teeth (5) on each heat conduction plate (4) are arranged as a plurality of tooth rows, and the plurality of tooth rows are all along the heat conduction plate (4) are arranged at intervals in the width direction, and the heat conduction teeth (5) in each tooth row are arranged at intervals along the length direction of the heat conduction plate (4). 4. The high power density motor according to claim 1, characterized in that: a water cooling channel (101) is arranged in the casing (1).