WO2018054225A1

WO2018054225A1 - Cooling device for reducing temperature of permanent magnet in permanent magnet motor

Info

Publication number: WO2018054225A1
Application number: PCT/CN2017/100873
Authority: WO
Inventors: 李伟力; 曹钊滨; 李金阳; 李栋; 张晓晨; 曹君慈; 沈稼丰; 程鹏
Original assignee: 北京交通大学
Priority date: 2016-09-20
Filing date: 2017-09-07
Publication date: 2018-03-29
Also published as: CN106340981B; RU2728758C1; CN106340981A

Abstract

A cooling device for reducing the temperature of a permanent magnet in a permanent magnet motor. The device comprises a motor stator, a motor rotor, and a rotating shaft (13). The motor stator comprises a stator core (1), a stator winding (2), stator axial ventilation grooves (3), and a stator radial ventilation groove (4). The motor rotor comprises a rotor core (6), a rotor radial ventilation groove (12), starting cage bars (7), permanent magnet steels (8), a magnetic isolating ring (9), photo-frame-type derivative slot wedges (10), and slot wedge axial ventilation holes (11). The stator core (1) is axially provided with the stator radial ventilation groove (4), and is provided with the stator axial ventilation grooves (3) along the circumference. The rotor core (6) is axially provided with the rotor radial ventilation groove (12). The photo-frame-type derivative slot wedges (10) are provided with the slot wedge axial ventilation holes (11). The rotating shaft (13) is provided with an axial-flow fan (14). Under the action of an axial-flow fan (14) or a centrifugal fan, a photo-frame-type derivative cooling structure for reducing the temperature of a permanent magnet in a permanent magnet motor can effectively reduce the temperatures of a stator core and a rotor core, and in particular, the temperature of the permanent magnet in a rotor, thereby improving the cooling efficiency of the motor.

Description

Cooling device for lowering permanent magnet temperature in permanent magnet motor

[0001] The present invention relates to the field of permanent magnet motor technology, and more particularly to a cooling device for reducing the temperature of a permanent magnet in a permanent magnet motor.

Background technique

[0002] Permanent magnet motors, especially solid rotor permanent magnet motors, have a large number of harmonics in the air gap magnetic field during operation, and a large amount of eddy current loss occurs in the rotor permanent magnets, and the power density of the permanent magnet motor is high. The motor is small in size, the heat dissipation condition is relatively poor, and the ambient temperature changes greatly, which causes the permanent magnet in the motor to have an irreversible demagnetization risk, resulting in a decrease in the performance of the permanent magnet motor or even completely losing the driving capability.

[0003] Therefore, how to effectively suppress the motor temperature and reduce the temperature of the permanent magnet has become the focus of current research.

technical problem

Embodiments of the present invention provide a cooling device that reduces the temperature of a permanent magnet in a permanent magnet motor to effectively reduce the temperature of a permanent magnet in a permanent magnet motor.

Problem solution

Technical solution

In order to achieve the above object, the present invention adopts the following technical solutions.

[0006] A cooling device for reducing the temperature of a permanent magnet in a permanent magnet motor, comprising:

[0007] a motor stator, a motor rotor, the motor stator is mounted outside the motor rotor, the motor stator includes a stator core, a stator winding, a stator axial ventilation groove, a stator radial ventilation groove, and the motor rotor Including rotor core, rotor radial ventilation groove, starting cage, permanent magnet steel, magnetic isolation ring, wedge, slot wedge axial ventilation hole.

[0008] Further, the stator core has N stator radial ventilation grooves in the axial direction, and N stator axial ventilation grooves in the circumferential direction; the rotor core has a rotor radial ventilation groove.

[0009] Further, the starting cage strip and the slot wedge are embedded in the rotor core, and the slot wedge has a slot wedge axial venting hole.

[0010] Further, the slot wedge is a frame structure or a trapezoidal structure or an inverted T structure, and the permanent magnet magnetic steel embedded system The groove wedge material; the groove wedge material is a non-magnetic non-conductive material.

[0011] Further, the rotor radial ventilation groove and the stator radial ventilation groove have a one-to-one correspondence in the radial direction.

[0012] further, the slot wedge is a cavity structure;

[0013] further, the rotor core is provided with a rotor pressure plate at both ends thereof;

[0014] Further, the rotor pressure plate is provided with a venting hole that matches the size of the axial venting hole of the wedge.

[0015] Further, a rotating shaft is disposed in an internal cavity of the rotor of the motor, and the rotating shaft has an axial fan.

[0016] It can be seen from the technical solutions provided by the embodiments of the present invention that the cooling device for reducing the temperature of the permanent magnet in the permanent magnet motor can effectively reduce the cooling device under the action of the axial fan or the centrifugal fan. The temperature of the rotor core and the permanent magnet increases the cooling efficiency of the motor.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows.

Advantageous effects of the invention

Beneficial effect

[0018] The cooling device for reducing the temperature of the permanent magnet in the permanent magnet motor provided by the embodiment of the invention can effectively reduce the temperature of the stator core and the permanent magnet under the action of the axial fan or the centrifugal fan, and improve the cooling efficiency of the motor.

[0019] The cooling device for reducing the temperature of the permanent magnet in the permanent magnet motor provided by the embodiment of the present invention improves the working reliability of the motor by changing the wind path structure of the motor and suppressing the temperature of the motor under the premise of ensuring the starting and running performance of the motor.

Brief description of the drawing

DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some implementations of the present invention. For example, other drawings may be obtained from those skilled in the art without any inventive labor.

1 is a schematic structural diagram of a cooling device for reducing the temperature of a permanent magnet in a permanent magnet motor according to an embodiment of the present invention; 2 is a schematic diagram of ventilation of a cooling device for reducing the temperature of a permanent magnet in a permanent magnet motor according to an embodiment of the present invention;

3 is a schematic diagram of a rotor wedge derivative in a cooling device for reducing the temperature of a permanent magnet in a permanent magnet motor according to an embodiment of the present invention;

4 is a schematic diagram of a rotor wedge derivative in a cooling device for reducing the temperature of a permanent magnet in a permanent magnet motor according to an embodiment of the present invention;

[0025] FIG. 5 is a schematic diagram of a rotor wedge derivative in a cooling device for reducing the temperature of a permanent magnet in a permanent magnet motor according to an embodiment of the present invention;

[0026] In the figure: stator core 1, stator winding 2, stator axial ventilation groove 3, stator radial ventilation groove 4, air gap 5, rotor core 6, starting cage 7, permanent magnet steel 8, partition The magnetic ring 9, the wedge 10, the wedge axial vent 11 , the rotor radial vent 12, the rotating shaft 13, and the axial fan 14.

BEST MODE FOR CARRYING OUT THE INVENTION

[0027] The paragraphs describing the best mode of the invention are entered here.

Embodiments of the invention

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions.

. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

[0029] The singular forms "a", "an", "the" It will be further understood that the phrase "comprising", used in the <RTI ID=0.0></RTI><RTIgt;</RTI><RTIgt;</RTI><RTIgt;</RTI> is intended to mean the presence of the features, integers, steps, operations, components and/or components, but does not exclude the presence or addition of one or more other features, Integers, steps, operations, components, components, and/or their groups. It will be understood that when we refer to an element being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or an intermediate element can be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. The phrase "and/or" used herein includes any and all combinations of one or more of the associated listed. [0030] Those skilled in the art will appreciate that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs, unless otherwise defined. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the context of the prior art, and unless defined as herein, will not be idealized or overly formal. Explanation.

[0031] In order to facilitate the understanding of the embodiments of the present invention, the following detailed description of the embodiments of the invention,

[0032] The present invention provides a cooling device for reducing the temperature of a permanent magnet in a permanent magnet motor. Under the premise of ensuring the starting and running performance of the motor, the motor wind circuit structure is changed, the motor temperature is suppressed, and the working reliability of the motor is improved.

[0033] A cooling device for reducing the temperature of a permanent magnet in a permanent magnet motor according to an embodiment of the present invention includes a motor stator and a motor rotor, and the motor stator is mounted outside the rotor of the motor. The motor stator includes a stator core, a stator winding, a stator axial ventilation groove, and a stator radial ventilation groove; the motor rotor includes a rotor core, a rotor radial ventilation groove, a starting cage strip, a permanent magnet magnet, and a magnetic isolation Ring, wedge, and wedge axial vents.

[0034] the stator core has N stator radial ventilation grooves in the axial direction, N stator axial ventilation grooves in the circumferential direction; the rotor core has a rotor radial ventilation groove; the groove wedge The upper jaw has a slotted axial vent.

[0035] The slot wedge is a frame structure or an inverted T-shaped structure or a trapezoidal structure, and the permanent magnet magnetic steel is embedded in the slot wedge; the slot wedge material is a non-magnetic non-conductive material.

[0036] The rotor radial ventilation groove and the stator radial ventilation groove have a one-to-one correspondence in the radial direction. The wedge is a cavity structure; rotor cores are disposed at both ends of the rotor core.

[0037] The rotor pressure plate is provided with a venting hole that matches the size of the axial venting hole of the wedge.

[0038] A rotating shaft is disposed in an inner cavity of the motor rotor, and the rotating shaft has an axial fan.

1 is a schematic structural diagram of a cooling device for reducing the temperature of a permanent magnet in a permanent magnet motor according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of ventilation of the device. An embodiment of the present invention is described below with reference to FIG. 1 and FIG. 2 . A cooling device for reducing the temperature of a permanent magnet in a permanent magnet motor includes a stator core 1 , a stator winding 2 , and an axial axial venting groove 3 . Stator radial venting groove 4, air gap 5, rotor core 6, starting cage strip 7, permanent magnet steel 8, magnetic isolation ring 9, wedge 10, wedge axial venting hole 11, radial ventilation of the rotor The hole 12, the rotating shaft 13, and the axial fan 14 are composed. Wherein, the stator core 1 has a stator axial ventilation groove 3 along the circumference, and a stator radial ventilation groove 4 is axially arranged. As shown in FIG. 1, a rotor cage 7 is embedded in the rotor core 6, and the wedge 10 is a frame-like structure. A permanent magnet magnet 8 is embedded in the wedge 10, the wedge 10 has a wedge axial vent 11 and a rotor radial vent 12, and the wedge 10 has a cavity structure.

[0040] As shown in the ventilation diagram of FIG. 2, under the action of the axial flow fan 14, the cooling air outside the motor enters the inside of the motor along the air gap 5, the stator axial ventilation groove 3, and the wedge axial vent hole 11. A part of the air in the axial vent 11 of the wedge reaches the extension end of the motor shaft in the axial direction, and the other part enters the radial venting groove 3 of the stator and the radial venting hole 12 of the rotor under the action of the centrifugal force of the high-speed rotation of the rotor.

[0041] The above cooling device for reducing the temperature of the permanent magnet in the permanent magnet motor fully utilizes the radial radial ventilation structure to reduce the motor temperature, in particular, the frame type wedge-wound hollow structure, which can isolate the rotor core from transferring heat to the permanent magnet magnetic steel, The heat of the surface of the permanent magnet steel is taken away by the radial vent of the frame of the frame wedge, which effectively reduces the temperature of the permanent magnet.

3, FIG. 4 and FIG. 5 are schematic diagrams of a photo frame type derivation cooling device for reducing the temperature of a permanent magnet in a permanent magnet motor according to an embodiment of the present invention, and the working principle is similar to the device shown in FIG.

[0043] The difference between the device shown in FIG. 3, FIG. 4, and FIG. 5 and the device shown in FIG. 1 is mainly that the structure of the wedge 10 is different. The wedge 10 in FIG. 1 is a frame structure, and the frame-shaped structure has a groove inner band. In Fig. 3, the wedge 10 is a trapezoidal structure, and the width of the bottom of the wedge is the same as that of the permanent magnet; in Fig. 4, the wedge 10 is a trapezoidal structure, and the width of the bottom of the wedge is larger than the width of the permanent magnet; The wedge 10 is an inverted T-shaped structure, and the inside of the wedge has a groove axial axial ventilation groove.

[0044] In summary, the cooling device for reducing the temperature of the permanent magnet in the permanent magnet motor according to the embodiment of the present invention can effectively reduce the temperature of the stator core and the permanent magnet under the action of the axial fan or the centrifugal fan, thereby improving the temperature of the stator core and the permanent magnet. The cooling efficiency of the motor.

[0045] The cooling device for reducing the temperature of the permanent magnet in the permanent magnet motor provided by the embodiment of the present invention improves the working reliability of the motor by changing the wind path structure of the motor and suppressing the temperature of the motor under the premise of ensuring the starting and running performance of the motor.

It will be understood by those of ordinary skill in the art that the drawings are only a schematic representation of one embodiment, and the modules or processes in the drawings are not necessarily required to practice the invention.

[0047] Those skilled in the art can understand that the components in the device in the embodiment can be described in accordance with an embodiment. Distributed in the apparatus of the embodiment, it is also possible to make corresponding changes in one or more of the devices different from the embodiment. The components of the above embodiments may be combined into one component or may be further split into a plurality of subcomponents.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. Alternatives are intended to be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

Claim

A cooling device for reducing the temperature of a permanent magnet in a permanent magnet motor, comprising: a motor stator and a motor rotor, wherein the motor stator is mounted outside the rotor of the motor, and the stator of the motor comprises a stator core and a stator winding The stator axial ventilation groove and the stator radial ventilation groove, the motor rotor includes a rotor core, a rotor radial ventilation groove, a starting cage strip, a permanent magnet magnet, a magnetic isolation ring, a wedge wedge, and a wedge axial axial ventilation hole .

The device according to claim 1, wherein the stator core has N stator radial ventilation grooves in the axial direction, and N stator axial ventilation grooves in the circumferential direction; There is a rotor radial ventilation groove.

The device according to claim 1, wherein the starter cage and the wedge are embedded in the rotor core, and the wedge has an axial vent hole on the wedge.

The device according to claim 1, wherein the slot wedge is a frame structure or a trapezoidal structure or an inverted T-shaped structure, and a permanent magnet magnetic steel is embedded in the slot wedge; the slot wedge material is non-magnetically Conductive material.

The apparatus according to claim 2, wherein said rotor radial venting groove is in one-to-one correspondence with the stator radial venting groove.

The apparatus according to claim 4, wherein the slot wedge is a cavity structure; the apparatus according to claim 2, wherein both ends of the rotor core are provided with a rotor pressure plate;

The apparatus of claim 7 wherein said rotor platen retains a venting aperture that matches the axial venting aperture of said wedge.

The apparatus according to claim 8, wherein a rotating shaft is provided in an internal cavity of the rotor of the motor, the rotating shaft having an axial fan.