CN112366894A

CN112366894A - Rare earth permanent magnet motor

Info

Publication number: CN112366894A
Application number: CN202011296821.6A
Authority: CN
Inventors: 邹联石
Original assignee: Jiangxi Lima Electromechanical Technology Co ltd
Current assignee: Jiangxi Lima Electromechanical Technology Co ltd
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2021-02-12

Abstract

The invention relates to the technical field of permanent magnet motors, and provides a rare earth permanent magnet motor. The motor rotor comprises a housing body, a rotating shaft, a rotor core, permanent magnetic pole pieces, a stator core and a winding, wherein a ventilation cavity and two cavities inside and outside an oil cavity are arranged in the housing body, a cooling blade is led out from the bottom of the oil cavity, the stator core is radially provided with an air vent I, the cooling blade is provided with a plurality of groups of air vents III, a through hole is formed in the middle of the rotating shaft, auger blades are fixed in the through hole, the rotating shaft is provided with a plurality of groups of radial air vents II, the rotor core is provided with radial air vents corresponding to the positions of the air vents II, the rotor core is provided. The invention cancels the ventilation hole on the motor shell and ventilates through the rotating shaft; meanwhile, the rotor core and the stator core are provided with the vent holes, so that the heat dissipation efficiency in the motor is improved; and air cooling and liquid cooling are combined to dissipate heat, so that the overall heat dissipation performance of the motor is improved.

Description

Rare earth permanent magnet motor

Technical Field

The invention relates to the technical field of permanent magnet motors, in particular to a rare earth permanent magnet motor.

Background

The permanent magnet motor runs at a high speed, a large amount of heat is generated, and a permanent magnet of the permanent magnet motor loses magnetism at a high temperature. In the prior art, ventilation and heat dissipation are generally adopted to solve the heat dissipation problem. In order to provide a ventilation air duct, the motor is provided with a ventilation hole in the casing, and then heat is dissipated by a heat dissipation fan in the motor. However, dust and water vapor can enter the ventilation holes formed in the shell and pollute the electrical property of the windings and the permanent magnetic pole pieces in the motor, and finally the performance of the motor is influenced.

In order to overcome the defects of ventilation and heat dissipation in the prior art, a liquid cooling mode is adopted to dissipate heat of the motor. However, the liquid inventory for liquid cooling is generally fixed, so cooling with the cooling liquid alone does not provide efficient heat dissipation if the motor is operated for a long period of time. So the cooling by liquid can be combined with the ventilation and heat dissipation.

The heating parts of the permanent magnet motor are mainly permanent magnet pole pieces and windings, a rotor core and a stator core are generally solid in the prior art, and the solid structure is not beneficial to the dissipation of heat inside the motor.

Disclosure of Invention

The invention aims to provide a rare earth permanent magnet motor which is mainly used for solving the problem that dust and water vapor are easy to enter a vent hole of the existing motor shell and solving the problem that solid rotor cores and stator cores are not beneficial to heat dissipation.

The technical problem of the invention is mainly solved by the following technical scheme: the cooling device comprises an outer shell, end covers are fixed at two ends of the outer shell through bolts, a rotating shaft is connected in the middle of each end cover through a bearing rotating shaft, a rotor core is arranged in the middle of the rotating shaft, a plurality of groups of permanent magnetic pole pieces are fixed on the outer wall of the rotor core, a stator core is fixed on the inner wall of the outer shell, a winding is arranged in the stator core, a ventilation cavity and two cavities inside and outside the oil cavity are arranged in the outer shell, a plurality of groups of cooling blades are led out from the bottom of the oil cavity, the tops of the cooling blades penetrate through the outer wall of the outer shell, the stator core is radially provided with a plurality of groups of ventilation holes I, the ventilation holes I are communicated with the ventilation cavity, the cooling blades are provided with a plurality of groups of ventilation holes III, the ventilation holes III are communicated with the ventilation cavity, the rotor core is provided with radial vent holes corresponding to the positions of the vent holes II, the rotor core is provided with a plurality of groups of axial vent holes in the axial direction, the radial vent holes are communicated through the axial vent holes, and one end of the rotating shaft is fixed with fan blades.

The invention has the beneficial effects that: the ventilation hole on the motor shell is eliminated, the through channel is arranged in the rotating shaft, and the auger blade is arranged in the rotating shaft, so that the ventilation speed can be improved; meanwhile, the rotor core and the stator core are provided with the vent holes, so that the heat dissipation efficiency in the motor is improved; and air cooling and liquid cooling are combined to dissipate heat, so that the overall heat dissipation performance of the motor is improved.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention;

description of reference numerals: 1. the motor comprises an outer shell, 2 parts of an end cover, 3 parts of a stator core, 301 parts of vent holes I, 4 parts of windings, 5 parts of a rotating shaft, 501 parts of through holes, 502 parts of vent holes II, 6 parts of a bearing, 7 parts of a rotor core, 701 parts of axial vent holes, 702 parts of radial vent holes, 8 parts of fan blades, 9 parts of radiating blades, 901 parts of vent holes III, 10 parts of an oil cavity, 11 parts of a vent cavity, 12 parts of permanent magnetic pole pieces and 13 parts of auger blades.

Detailed Description

The technical solution of the present invention is further specifically described below by way of examples with reference to fig. 1.

Example 1

The rare earth permanent magnet motor comprises an outer shell 1, end covers 2 are fixed at two ends of the outer shell 1 through bolts, a rotating shaft 5 is connected to the middle of each end cover 2 through a bearing 6 and the rotating shaft 5, a rotor core 7 is arranged in the middle of each rotating shaft 5, a plurality of groups of permanent magnetic pole pieces 12 are fixed on the outer wall of each rotor core 7, a stator core 3 is fixed on the inner wall of the outer shell 1, a winding 4 is arranged in each stator core 3, a ventilation cavity 11 and two cavities inside and outside an oil cavity 10 are arranged in the outer shell 1, a plurality of groups of radiating blades 9 are led out from the bottom of the oil cavity 10, the tops of the radiating blades 9 penetrate through the outer wall of the outer shell 1, a plurality of groups of air vents I301 are radially arranged on the stator core 3, the air vents I301 are communicated with the ventilation cavity 11, the radiating blades 9 are respectively provided with a plurality of, the rotating shaft 5 is provided with a plurality of groups of radial vent holes II 502, the rotor core 7 is provided with radial vent holes 702 corresponding to the positions of the vent holes II 502, the rotor core 7 is provided with a plurality of groups of axial vent holes 701 in the axial direction, the radial vent holes 702 are communicated through the axial vent holes 701, and one end of the rotating shaft 5 is fixed with a fan blade 8.

In the using process, the rotating shaft 5 rotates under the action of magnetic flux, the auger blade 13 inside the rotating shaft 5 rotates synchronously in the rotating process, the rotating auger blade 13 continuously introduces outside air into the rotating shaft 5, and simultaneously the air entering the rotating shaft 5 enters the motor from the air vent II 502. And the rotating shaft 5 also drives the fan blades 8 to rotate, the rotating fan blades 8 accelerate air to enter the motor from the air vent II 502, and simultaneously wind power formed by the fan blades 8 enters the axial air vent 701 of the rotor core 7. And the heat generated by the permanent magnet pole pieces 12 on the rotor core 7 can enter the radial vent holes 702, so that the wind force entering the axial vent holes 701 can take the heat in the radial vent holes 702 away from the rotor core 7. Meanwhile, air inside the motor can enter the ventilation cavity 11 from the ventilation holes I301 on the stator core 3 and is discharged out of the motor from the ventilation holes III 901 on the radiating blades 9. When the hot air in the motor is discharged out of the motor from the ventilation cavity 11, the oil cavity 10 on the motor outer shell 1 dissipates the heat of the ventilation cavity 11, so that the hot air can be discharged after being dissipated. Therefore, the motor can not be surrounded by high-temperature gas, and the air cooling effect is not reduced due to overhigh temperature of air entering the motor.

While the foregoing embodiments are illustrative of the present invention, various modifications and changes may be readily made by those skilled in the art based upon the teachings and principles of this invention, which are intended to be limited not to the details of construction and methods herein shown, but rather to the preferred embodiments described, and therefore all equivalent modifications and changes in light of the above teachings are intended to be included within the scope of the present invention as defined in the appended claims.

Claims

1. A rare earth permanent magnet motor comprises a shell body (1), wherein end covers (2) are fixed at two ends of the shell body (1) through bolts, a rotating shaft (5) is connected to the middle of each end cover (2) through a bearing (6) and the rotating shaft (5), a rotor core (7) is arranged in the middle of each rotating shaft (5), a plurality of groups of permanent magnet pole pieces (12) are fixed on the outer wall of each rotor core (7), a stator core (3) is fixed on the inner wall of the shell body (1), a winding (4) is arranged in each stator core (3), the rare earth permanent magnet motor is characterized in that a ventilation cavity (11) and two inner and outer cavities of an oil cavity (10) are arranged in the shell body (1), a plurality of groups of heat dissipation blades (9) are led out from the bottom of the oil cavity (10), the tops of the heat dissipation blades (9) penetrate through the outer wall of the shell body (1), and a, air vent I (301) with ventilate chamber (11) intercommunication, heat dissipation blade (9) all are equipped with multiunit air vent III (901), air vent III (901) with ventilate chamber (11) intercommunication, be equipped with through-hole (501) in the middle of pivot (5), through-hole (501) internal fixation has auger leaf (13), pivot (5) are equipped with multiunit radial air vent II (502), rotor core (7) be equipped with the corresponding radial air vent (702) in air vent II (502) position, rotor core (7) are equipped with multiunit axial air vent (701) in the axial, axial air vent (701) will radial air vent (702) intercommunication, the one end of pivot (5) is fixed with flabellum (8).