Motor, compressor, and electrical appliance having the same

Abstract

The present application provides a motor, a compressor, and an appliance having the same, including a motor rotating shaft and a stator core; the motor rotating shaft includes a magnet segment and a heat insulation portion; the heat insulation portion is disposed at an end of the magnet segment; the stator core is disposed on an outer peripheral side of the magnet segment; a heat conduction portion is provided on the stator core; the heat conduction portion extends from the outer peripheral side of the stator core to the inner peripheral side of the stator core. According to the motor, the compressor, and the equipment having the same of the present application, the structure is simple and the overall cooling effect can be improved.

Description

Technical Field

[0001] The present application belongs to the field of motor technology, and specifically relates to a motor, a compressor, and an electrical appliance having the same. Background Art

[0002] At present, the common surface-mounted permanent magnet high-speed motor rotor structure consists of a sheath / carbon fiber, front and rear short shafts and magnetic steel, of which the magnetic steel can be designed as a solid or annular structure. During the high-speed operation of the high-speed motor, under the action of high-frequency harmonics, the rotor will generate eddy current losses, which will cause the rotor to heat up. When the rotor heats up seriously, the high-speed permanent magnet motor will have the following problems: ① The magnetic steel may be permanently and irreversibly demagnetized; ② The heating of the rotor causes a large temperature rise of the entire shaft, resulting in axial deformation, causing bearing failure and the whole machine to be scrapped; ③ The heating of the rotor part is due to the contact between the front and rear short shafts and the magnetic steel and the sheath / carbon fiber, which makes the front and rear bearings have a large amount of heat and radial deformation. ④ When a metal sheath is used, after the heat accumulates in the rotor part, due to the different thermal expansion coefficients of the sheath and the magnetic steel material, the expansion of the sheath after the temperature rises will be greater than the expansion of the magnetic steel, resulting in the actual interference amount being far less than the design value, creating a safety hazard.

[0003] However, the main cooling methods for surface-mounted high-speed permanent magnet motors include air cooling, water cooling, or a combination of water cooling and air cooling. The water cooling method is to add circulating water to the outer circle of the stator core to continuously cool the stator core. Due to the air gap between the rotor and the stator core, the heat generated by the high-speed movement of the rotor cannot be effectively transferred to the stator core through the air gap, and the synchronous cooling of the stator and rotor of the high-speed motor cannot be achieved, and the cooling effect is poor. The air cooling method is to add an axial axial flow fan inside the high-speed permanent magnet motor to remove the heat through the flowing air. When the fan is running at high speed, the airflow and vibration generated will cause the dynamic balance of the motor, affecting the stability of the motor, and the outer diameter of the motor will increase, the overall modality will decrease, and the strength will also decrease. An air film will be generated between the air gap between the rotor and the stator, and the cooling wind generated by the axial flow fan cannot blow into the air film, resulting in poor cooling effect. The combination of water cooling and air cooling can achieve a better cooling effect. However, adding air cooling to water cooling will introduce external sources, making the structure of the motor more complicated, making the design and manufacturing more difficult, and increasing costs. The addition of radial ventilation holes in the water flow wall will lead to safety hazards in the water flow wall. The interior of the high-speed motor is composed of many precision parts. Air cooling will produce some impurities that enter the interior of the motor, which will damage or even destroy the parts in long-term operation.

[0004] Therefore, how to provide a motor, a compressor and an electrical appliance having the same which have a simple structure and can improve the overall cooling effect has become a problem that technicians in this field need to solve urgently. Summary of the invention

[0005] Therefore, the technical problem to be solved by this application is to provide a motor, a compressor, and an electrical appliance having the same, which have a simple structure and can improve the overall cooling effect.

[0006] To solve the above problems, this application provides a motor, including:

[0007] A motor shaft; the motor shaft includes a magnet steel section and a heat insulation section; the heat insulation section is arranged at the end of the magnet steel section;

[0008] And a stator core; the stator core is arranged on the outer peripheral side of the magnet steel section; a heat conduction part is arranged on the stator core; the heat conduction part extends from the outer peripheral side of the stator core to the inner peripheral side of the stator core.

[0009] Preferably, the motor shaft further includes a main shaft; the main shaft includes a front short shaft and a rear short shaft; in the central axis direction of the front short shaft, the front short shaft, the magnet steel section, and the rear short shaft are arranged in sequence; the heat insulation section is arranged between the front short shaft and the magnet steel section;

[0010] And / or, the heat insulation section is arranged between the rear short shaft and the magnet steel section.

[0011] Preferably, the magnet steel section includes a magnet steel body; the heat insulation section includes a first heat insulation section; in the central axis direction of the main shaft, the first heat insulation section is located between the front short shaft and the magnet steel body; and / or, the first heat insulation section is located between the rear short shaft and the magnet steel body;

[0012] And / or, the magnet steel section further includes a sheath; the heat insulation section includes a second heat insulation section; the sheath is sleeved outside the magnet steel body; and the second heat insulation section is arranged at at least one end of the sheath.

[0013] Preferably, the motor further includes a housing; the stator core is arranged in the housing; the heat conduction part is in contact with the housing; and / or, a cooling structure is arranged on the housing.

[0014] Preferably, the heat conduction part is a heat pipe; the first end of the heat pipe is in contact with the housing; the second end of the heat pipe extends to the inner peripheral side of the stator core.

[0015] Preferably, a cooling channel is arranged on the stator core; the cooling channel extends in the radial direction of the stator core; and / or, the heat conduction part is arranged in the cooling channel.

[0016] Preferably, the number of the heat conduction parts is set to be multiple; multiple heat conduction parts form at least one heat conduction group; when the number of the heat conduction groups is more than two groups, the two or more heat conduction groups are arranged in sequence in the central axis direction of the stator core.

[0017] Preferably, the number of the heat conduction groups is 2-3 groups;

[0018] And / or, each heat conduction group includes more than two heat conduction parts; in each heat conduction group, the more than two heat conduction parts are arranged in sequence in the circumferential direction of the stator core.

[0019] According to another aspect of the present application, a compressor is provided, including a motor, and the motor is the above-mentioned motor.

[0020] According to another aspect of the present application, an electrical appliance is provided, including a compressor, and the compressor is the above-mentioned compressor.

[0021] The motor, compressor and electrical appliance provided by the present application can achieve synchronous cooling of the stator and rotor of a high-speed motor without introducing an external gas source and complex structure; it can effectively solve the problems of increased overall axial deformation of the shaft and increased radial deformation of the bearing position due to rotor heating in a surface-mounted high-speed permanent magnet motor, which affect the operation of high-speed special bearings. The structure is simple and the overall cooling effect can be improved. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of the motor according to the embodiment of the present application.

[0023] The reference numerals are represented as:

[0024] 11, front short shaft; 12, rear short shaft; 2, magnet body; 21, sheath; 31, first heat insulation part; 32, second heat insulation part; 4, stator core; 41, stator winding; 5, heat conduction part; 6, housing; 61, water cooling channel. Detailed Embodiments

[0025] Referring to Figure 1 As shown, a motor includes a motor rotating shaft and a stator core 4; the motor rotating shaft includes a magnet segment and a heat insulation part; the heat insulation part is arranged at the end of the magnet segment; the stator core 4 is arranged on the outer peripheral side of the magnet segment; a heat conduction part 5 is arranged on the stator core 4; the heat conduction part 5 extends from the outer peripheral side of the stator core 4 to the inner peripheral side of the stator core 4, achieving synchronous cooling of the stator and rotor of a high-speed motor without introducing an external gas source and complex structure; it can effectively solve the problems of increased overall axial deformation of the shaft and increased radial deformation of the bearing position due to rotor heating in a surface-mounted high-speed permanent magnet motor, which affect the operation of high-speed special bearings. The structure is simple and the overall cooling effect can be improved. The motor includes a stator structure, and the stator structure includes not only the stator core 4 and the stator winding 41.

[0026] The present application also discloses some embodiments. The motor rotating shaft further includes a main shaft; the main shaft includes a front short shaft 11 and a rear short shaft 12; in the central axis direction of the front short shaft 11, the front short shaft 11, the magnet segment and the rear short shaft 12 are arranged in sequence; the heat insulation part is arranged between the front short shaft 11 and the magnet segment, which can improve the overall cooling effect, achieve a higher power density, reduce the risk of demagnetization of the permanent magnet rotor, has a simple structure without introducing external parts, and is small in volume.

[0027] The present application also discloses some embodiments, where the heat insulation part is arranged between the rear short shaft 12 and the magnet segment.

[0028] The present application also discloses some embodiments. The magnet segment includes a magnet body 2; the heat insulation part includes a first heat insulation part 31; in the central axis direction of the main shaft, the first heat insulation part 31 is located between the front short shaft 11 and the magnet body 2; the present application also discloses some embodiments, where the first heat insulation part 31 is located between the rear short shaft 12 and the magnet body 2; that is, the first heat insulation part 31 is arranged at both ends of the magnet segment; by adding a heat insulation part between the magnet body 2, the sheath 21 and the front short shaft 11, the rear short shaft 12, and using a low thermal conductivity material as the heat insulation material, the heat transfer in the axial direction is blocked. The blocked heat will be conducted along the axial direction into the sheath 21 and the air gap of the stator, which can effectively block the heat from diffusing to the bearing position, and further prevent the problem that during the high-speed operation of the motor, the rotor will cut the magnetic induction lines in the stator magnetic field and generate a large amount of heat, and the heat will be transferred along the axial direction to the bearing position, and the increase in the temperature of the bearing position will have a huge impact on the electromechanical device.

[0029] The present application also discloses some embodiments. The magnet segment further includes a sheath 21; the heat insulation part includes a second heat insulation part 32; the sheath 21 is sleeved outside the magnet body 2; and the second heat insulation part 32 is arranged at at least one end of the sheath 21. The number of the second heat insulation parts 32 is set to two, and the two second heat insulation parts 32 are respectively arranged at both ends of the sheath 21; the second heat insulation part 32 is a heat insulation ring; the heat insulation ring is sleeved outside the magnet, and one of the second heat insulation parts 32 is located between the sheath 21 and the front short shaft 11; the other second heat insulation part 32 is located between the sheath 21 and the rear short shaft 12. It can effectively prevent the heat from being transferred to the front short shaft 11 and the rear short shaft 12.

[0030] The present application also discloses some embodiments. The motor further includes a housing 6; the stator core 4 is arranged inside the housing 6; the heat conduction part 5 is in contact with the housing 6; the present application also discloses some embodiments, where a cooling structure is arranged on the housing 6.

[0031] The present application also discloses some embodiments, where the heat conduction part 5 is a heat pipe; the first end of the heat pipe is in contact with the housing 6; the second end of the heat pipe extends to the inner peripheral side of the stator core 4. Through the heat pipe with high heat absorption and high thermal conductivity, the heat generated by the rotor operation is quickly transferred to the housing 6 through the air gap, and is quickly cooled by the circulating cooling water in the water cooling channel 61 on the housing 6, so as to realize the synchronous cooling of the stator and rotor of the high-speed motor, ensure the operation at a lower temperature of the bearing position, reduce the possibility of bearing failure, reduce the risk of demagnetization of the permanent magnet rotor, finally improve the overall cooling effect, realize a higher power density, and extend the service life of the motor.

[0032] The present application also discloses some embodiments, in which a cooling channel is provided on the stator core 4; the cooling channel extends in the radial direction of the stator core 4; the present application also discloses some embodiments, in which a heat conducting part 5 is arranged in the cooling channel. A rotor cooling channel is added in the radial direction of the stator core 4, and a heat pipe extending radially is arranged in the cooling channel. The heat pipe is perpendicular to the axis of the stator core 4 and is evenly distributed in a ring shape within the stator. One end of the heat pipe is in contact with the housing 6, and the other end is in contact with the air gap between the stator and the rotor. The heat pipe is installed and fixed by interference fit with the cooling channel or potting encapsulation.

[0033] The present application also discloses some embodiments, in which the number of the heat conducting parts 5 is set to be multiple; the multiple heat conducting parts 5 form at least one heat conducting group; when the number of the heat conducting groups is more than two, the two or more heat conducting groups are arranged in sequence in the central axis direction of the stator core 4.

[0034] The present application also discloses some embodiments, in which the number of the heat conducting groups is 2 - 3 groups; the 2 - 3 groups of heat conducting groups are evenly arranged in the central axis direction of the stator core 4.

[0035] The present application also discloses some embodiments, in which each heat conducting group includes more than two heat conducting parts 5; in each heat conducting group, the more than two heat conducting parts 5 are arranged in sequence in the circumferential direction of the stator core 4. The heat conducting parts 5 in each heat conducting group are evenly distributed along the circumferential direction of the stator core 4. Each heat conducting group includes 2 - 6 heat conducting parts 5, which can effectively ensure that there is enough contact area between the heat pipe and the stator core 4 and the air gap, achieving a fast cooling effect. It can also prevent the problem that when too many heat pipes are added, it will affect the overall performance of the motor, and at the same time increase the cost, which is not conducive to industrial popularization and mass production. During the high-speed operation of the motor, eddy current loss is generated due to the induction of eddy currents in the magnetic steel and the sheath 21, causing the entire rotor to generate heat. The heat can be transferred to the housing 6 through the heat conducting part 5, and the cooling structure on the housing 6 cools it.

[0036] There is an air gap between the stator and the rotor, and an interference fit exists between the stator and the housing 6. The cooling structure is a water cooling channel 61. The water cooling channel 61 and the housing 6 form a water-cooled housing. A rotor cooling channel is added in the radial direction of the stator. A radial heat pipe is installed in the cooling channel; a heat insulation ring is installed between the magnetic steel, the sheath 21 / carbon fiber and the contact between the two end parts, so that the heat generated by the rotor magnetic steel and the sheath 21 cannot be axially transferred to the bearing position. Since the axial heat dissipation is blocked, most of the heat will enter the air gap. Due to the high heat absorption and high thermal conductivity of the heat pipe, the heat in the air gap can be quickly transferred to the water-cooled housing for cooling.

[0037] According to the embodiments of the present application, a compressor is provided, including a motor, and the motor is the above-mentioned motor. The motor is a permanent magnet type high-speed motor.

[0038] According to an embodiment of the present application, a device is provided, including a compressor, which is the compressor described above. The device can be an electrical appliance, such as an air conditioner, or an air compressor device for a hydrogen fuel cell vehicle.

[0039] It is easily understood by those skilled in the art that, on the premise of no conflict, the above advantageous ways can be freely combined and superimposed.

[0040] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only the preferred implementation manner of the present application. It should be noted that for those of ordinary skill in the art in the technical field, without departing from the technical principle of the present application, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present application.

Claims

1. A motor, characterized in that, it includes: a motor rotating shaft; the motor rotating shaft includes a magnet segment and a heat insulation part; the heat insulation part is arranged at the end of the magnet segment; and a stator core (4); the stator core (4) is arranged on the outer peripheral side of the magnet segment; a heat conduction part (5) is arranged on the stator core (4); the heat conduction part (5) extends from the outer peripheral side of the stator core (4) to the inner peripheral side of the stator core (4); the motor rotating shaft further includes a main shaft; the main shaft includes a front short shaft (11) and a rear short shaft (12); in the central axis direction of the front short shaft (11), the front short shaft (11), the magnet segment and the rear short shaft (12) are arranged in sequence; the heat insulation part is arranged between the front short shaft (11) and the magnet segment and between the rear short shaft (12) and the magnet segment; the magnet segment includes a magnet body (2); the heat insulation part includes a first heat insulation part (31); in the central axis direction of the main shaft, the first heat insulation part (31) is located between the front short shaft (11) and the magnet body (2) and between the rear short shaft (12) and the magnet body (2); the magnet segment further includes a sheath (21); the heat insulation part includes a second heat insulation part (32); the sheath (21) is sleeved outside the magnet body (2); and the second heat insulation part (32) is arranged at at least one end of the sheath (21); the motor further includes a housing (6), and the stator core (4) is arranged in the housing (6); the heat conduction part (5) is in contact with the housing (6).

2. The motor according to claim 1, characterized in that, a cooling structure is arranged on the housing (6).

3. The motor according to claim 2, characterized in that, the heat conduction part (5) is a heat pipe; the first end of the heat pipe is in contact with the housing (6); the second end of the heat pipe extends to the inner peripheral side of the stator core (4).

4. The motor according to claim 1, characterized in that, a cooling channel is arranged on the stator core (4); the cooling channel extends in the radial direction of the stator core (4); and / or, the heat conduction part (5) is arranged in the cooling channel.

5. The motor according to claim 1, characterized in that, the number of the heat conduction parts (5) is set to be multiple; multiple heat conduction parts (5) form at least one heat conduction group; when the number of the heat conduction groups is more than two groups, two or more heat conduction groups are arranged in sequence in the central axis direction of the stator core (4).

6. The motor according to claim 5, characterized in that, the number of the heat conduction groups is 2 - 3 groups; and / or, each heat conduction group includes two or more heat conduction parts (5); in each heat conduction group, two or more heat conduction parts (5) are arranged in sequence in the circumferential direction of the stator core (4).

7. A compressor, including a motor, characterized in that, the motor is the motor according to any one of claims 1 - 6.

8. An electrical appliance, including a compressor, characterized in that, The compressor is the compressor described in claim 7.

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