Magnetic steel cooling structure of permanent magnet motor rotor

Abstract

A magnetic steel cooling structure of a permanent magnet motor rotor comprises a rotating shaft, and a front balance plate, a rotor iron core and a rear balance plate are sequentially arranged on the rotating shaft. The rotating shaft is provided with an oil duct hole, the circumference of the rotating shaft is provided with an oil through hole, and the oil through hole is communicated with the oil duct hole; the front balance plate is provided with an oil inlet groove and an oil outlet groove, the position of the oil inlet groove in the front balance plate is opposite to the position of the oil outlet groove in the rear balance plate, and the oil inlet groove in the front balance plate is communicated with the oil outlet groove in the rear balance plate through a magnetic steel groove. Cooling oil can enter the magnetic steel grooves to directly cool the magnetic steel, the cooling effect of the magnetic steel is greatly improved, the risk of high-temperature demagnetization is reduced, the number of the magnetic steel can be reduced, the purposes of reducing cost and increasing efficiency are achieved, the cooling oil can be sprayed to the end of the winding through the oil outlet holes, the purpose of cooling the winding is achieved, the efficiency of the motor is improved, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of motors, in particular to a motor cooling technology, in particular to a magnetic steel cooling structure of a permanent magnet motor rotor. Background Art

[0002] In the alternating electromagnetic field environment of the permanent magnet motor, the magnetic steel will produce eddy current loss, causing the temperature to rise, and the magnetic steel performance will gradually decrease with the increase in temperature. Therefore, it is necessary to control the temperature of the magnetic steel. The motor cooling method in the existing technology cannot directly cool the magnetic steel, but indirectly cools it through the casing or iron core, and the cooling effect is poor. Summary of the invention

[0003] The utility model aims to provide a magnetic steel cooling structure for a permanent magnet motor rotor, which is intended to solve the technical problem in the prior art that the cooling effect of the magnetic steel of the permanent magnet motor rotor is not good enough.

[0004] The utility model discloses a magnetic steel cooling structure of a permanent magnet motor rotor, comprising a rotating shaft, on which a front balancing plate, a rotor core and a rear balancing plate are sequentially arranged;

[0005] An oil passage hole is axially arranged in the front end face of the rotating shaft, and at least two radial oil holes are arranged at intervals along the circumferential direction at the positions of the front balance plate and the rear balance plate on the rotating shaft, and the oil holes are connected to the oil passage hole;

[0006] At least two oil inlet grooves and at least two oil outlet grooves are respectively arranged on the end surfaces facing each other of the front balancing plate and the rear balancing plate, any one of the oil inlet grooves is communicated with the oil through hole, and any one of the oil outlet grooves is respectively communicated with an oil outlet hole, the position of the oil inlet groove on the front balancing plate is opposite to the position of the oil outlet groove on the rear balancing plate, and the position of the oil outlet groove on the front balancing plate is opposite to the position of the oil inlet groove on the rear balancing plate, at least two magnetic steel grooves are arranged in the rotor core at intervals along the circumferential direction, the magnetic steel grooves extend parallel to the axial direction of the rotor core and penetrate the rotor core, any one of the oil inlet grooves on the front balancing plate is respectively communicated with the corresponding oil outlet groove on the rear balancing plate through one of the magnetic steel grooves, and any one of the oil outlet grooves on the front balancing plate is respectively communicated with the corresponding oil inlet groove on the rear balancing plate through one of the magnetic steel grooves.

[0007] Furthermore, the oil inlet grooves and the oil outlet grooves are arranged alternately and spaced along the circumferential direction.

[0008] Furthermore, the oil outlet holes are arranged on the radial outer circumferential surfaces of the front balance plate and the rear balance plate.

[0009] Furthermore, an oil storage ring is provided between the inner circumferential surface of the front balance plate and the rear balance plate and the rotating shaft, and the oil storage ring is communicated with the oil through hole and the oil inlet groove.

[0010] Compared with the prior art, the utility model has a positive and obvious effect. The utility model sets oil channel holes, oil inlet grooves, oil outlet grooves, etc. on the rotating shaft, the front balance plate, and the rear flat plate, so that the cooling oil can enter the magnetic steel groove to directly cool the magnetic steel, which greatly improves the cooling effect of the magnetic steel and reduces the risk of high-temperature demagnetization, thereby reducing the grade of the magnetic steel (selecting magnetic steel materials with lower magnetic performance indicators but lower costs), achieving the purpose of reducing costs and increasing efficiency. The cooling oil can also be sprayed to the end of the winding through the oil outlet hole to achieve the purpose of cooling the winding, improve the efficiency of the motor, and extend the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The utility model is a schematic diagram of a magnetic steel cooling structure of a permanent magnet motor rotor.

[0012] Figure 2 The utility model is a schematic diagram of a rotating shaft in a magnetic steel cooling structure of a permanent magnet motor rotor.

[0013] Figure 3 The utility model is a schematic diagram of a front balancing plate and a rear balancing plate in a magnetic steel cooling structure of a permanent magnet motor rotor.

[0014] Figure 4 The utility model is a schematic diagram of a rotor and a rotor core in a magnetic steel cooling structure of a permanent magnet motor rotor. DETAILED DESCRIPTION

[0015] The present invention is further described below in conjunction with an embodiment, but the present invention is not limited to the embodiment. Any similar structure and similar changes of the present invention should be included in the protection scope of the present invention. The use of directions such as up, down, front, back, left, and right in the present invention is only for the convenience of clear description and is not a limitation on the technical solution of the present invention.

[0016] like Figure 1-Figure 4 As shown, a magnetic steel cooling structure of a permanent magnet motor rotor of the utility model comprises a rotating shaft 1, on which a front balancing plate 2, a rotor core 3 and a rear balancing plate 4 are sequentially arranged;

[0017] An oil passage hole 5 is axially arranged in the front end face of the rotating shaft 1, and at least two radial oil holes 6 are arranged at intervals along the circumferential direction at positions adjacent to the front balance plate 2 and the rear balance plate 4 of the rotating shaft 1, and the oil holes 6 are communicated with the oil passage hole 5;

[0018] At least two oil inlet grooves 8 and at least two oil outlet grooves 9 are respectively arranged on the end surfaces of the front balancing plate 2 and the rear balancing plate 4 facing each other, any one of the oil inlet grooves 8 is communicated with the oil through hole 6, and any one of the oil outlet grooves 9 is respectively communicated with an oil outlet hole 10, the position of the oil inlet groove 8 on the front balancing plate 2 is opposite to the position of the oil outlet groove 9 on the rear balancing plate 4, and the position of the oil outlet groove 9 on the front balancing plate 2 is opposite to the position of the oil inlet groove 8 on the rear balancing plate 4. At least two magnetic steel grooves 7 are arranged in the rotor core 3 at intervals along the circumferential direction, and the magnetic steel grooves 7 extend parallel to the axial direction of the rotor core 3 and penetrate the rotor core 3. Any one of the oil inlet grooves 8 on the front balancing plate 2 is respectively communicated with the corresponding oil outlet groove 9 on the rear balancing plate 4 through one of the magnetic steel grooves 7, and any one of the oil outlet grooves 9 on the front balancing plate 2 is respectively communicated with the corresponding oil inlet groove 8 on the rear balancing plate 4 through one of the magnetic steel grooves 7.

[0019] Furthermore, the oil inlet grooves 8 and the oil outlet grooves 9 are arranged alternately and spaced apart in the circumferential direction.

[0020] Furthermore, the oil outlet holes 10 are arranged on the radial outer circumferential surfaces of the front balance plate 2 and the rear balance plate 4 .

[0021] Furthermore, an oil storage ring 11 is disposed between the inner circumferential surface of the front balance plate 2 and the rear balance plate 4 and the rotating shaft 1 , and the oil storage ring 11 is communicated with the oil through hole 6 and the oil inlet groove 8 .

[0022] Specifically, the rotating shaft 1, the rotor core 3, the magnetic steel slot 7, etc. in this embodiment all adopt well-known solutions in the prior art, which are well understood by those skilled in the art and will not be described in detail here.

[0023] The working principle of this embodiment is as follows: during operation, the cooling oil enters the oil channel hole 5 of the rotating shaft 1, and enters the oil inlet groove 8 of the front balancing plate 2 and the rear balancing plate 4 from the oil holes 6 at both ends respectively. Then, the cooling oil in the oil inlet groove 8 of the front balancing plate 2 enters the magnetic steel groove 7 along the axial direction to directly cool the magnetic steel, and then the oil leaves the rotor through the oil outlet groove 9 and the oil outlet hole 10 on the rear balancing plate 4 to spray to the outer winding, thereby cooling the stator coil winding and achieving the purpose of cooling the winding; similarly, the cooling oil in the oil inlet groove 8 of the rear balancing plate 4 enters the magnetic steel groove 7 along the axial direction to directly cool the magnetic steel, and finally the oil leaves the rotor through the oil outlet groove 9 and the oil outlet hole 10 on the front balancing plate 2 to spray to the outer winding, thereby cooling the stator coil winding.

[0024] The utility model arranges oil channel holes 5, oil inlet grooves 8, oil outlet grooves 9, etc. on the rotating shaft 1, the front balance plate 2, and the rear flat plate, so that cooling oil can enter the magnetic steel groove 7 to directly cool the magnetic steel, which greatly improves the cooling effect of the magnetic steel and reduces the risk of high-temperature demagnetization, so that the magnetic steel grade can be reduced (magnetic steel materials with lower magnetic performance indicators but lower costs can be selected), achieving the purpose of reducing costs and increasing efficiency. The cooling oil can also be sprayed to the winding end through the oil outlet hole 10 to achieve the purpose of cooling the winding, improve the efficiency of the motor, and extend the service life.

Claims

1. A magnetic steel cooling structure for a permanent magnet motor rotor, comprising a rotating shaft, on which a front balancing plate, a rotor core and a rear balancing plate are sequentially arranged; characterized in that: An oil passage hole is axially arranged in the front end face of the rotating shaft, and at least two radial oil holes are arranged at intervals along the circumferential direction at the positions of the front balance plate and the rear balance plate on the rotating shaft, and the oil holes are connected to the oil passage hole; At least two oil inlet grooves and at least two oil outlet grooves are respectively arranged on the end surfaces facing each other of the front balancing plate and the rear balancing plate, any one of the oil inlet grooves is communicated with the oil through hole, and any one of the oil outlet grooves is respectively communicated with an oil outlet hole, the position of the oil inlet groove on the front balancing plate is opposite to the position of the oil outlet groove on the rear balancing plate, and the position of the oil outlet groove on the front balancing plate is opposite to the position of the oil inlet groove on the rear balancing plate, at least two magnetic steel grooves are arranged in the rotor core at intervals along the circumferential direction, the magnetic steel grooves extend parallel to the axial direction of the rotor core and penetrate the rotor core, any one of the oil inlet grooves on the front balancing plate is respectively communicated with the corresponding oil outlet groove on the rear balancing plate through one of the magnetic steel grooves, and any one of the oil outlet grooves on the front balancing plate is respectively communicated with the corresponding oil inlet groove on the rear balancing plate through one of the magnetic steel grooves.

2. The magnetic steel cooling structure of a permanent magnet motor rotor according to claim 1, characterized in that: The oil inlet grooves and the oil outlet grooves are arranged alternately along the circumferential direction.

3. The magnetic steel cooling structure of a permanent magnet motor rotor according to claim 1, characterized in that: The oil outlet holes are arranged on the radial outer circumferential surfaces of the front balance plate and the rear balance plate.

4. The magnetic steel cooling structure of a permanent magnet motor rotor according to claim 1, characterized in that: An oil storage ring is arranged between the inner circumferential surface of the front balance plate and the rear balance plate and the rotating shaft, and the oil storage ring is communicated with the oil through hole and the oil inlet groove.

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