CN106787295B

CN106787295B - Permanent magnet motor

Info

Publication number: CN106787295B
Application number: CN201710094834.7A
Authority: CN
Inventors: 高树彪; 高永升
Original assignee: Zhejiang Yongfa Electromechanics Ltd
Current assignee: Zhejiang Yongfa Electromechanics Ltd
Priority date: 2017-02-22
Filing date: 2017-02-22
Publication date: 2023-04-11
Anticipated expiration: 2037-02-22
Also published as: CN106787295A

Abstract

The permanent magnet motor comprises a motor shell, a stator, a rotor, a motor rotating shaft, an end cover, a fan and a protective cover, and further comprises a heat dissipation frame, wherein a stator iron core is fixed on the heat dissipation frame, the heat dissipation frame is fixed on the inner wall of the motor shell, a heat dissipation pipe is arranged in the heat dissipation frame, and a heat dissipation medium flows in the heat dissipation pipe; the end cover comprises an end cover body and a bulge part, the bulge part is provided with a shaft hole, and the end cover body is provided with a bearing cover mounting hole and a bearing mounting hole which are communicated with the shaft hole; the bearing cover mounting holes, the bearing mounting holes and the shaft hole are sequentially distributed from outside to inside, a bearing is mounted in each bearing mounting hole, a bearing cover for sealing the bearing is fixedly arranged in each bearing cover mounting hole, and a through hole is formed in the center of each bearing cover; the inner wall of the bearing cover is provided with a pressing ring which protrudes inwards, and the pressing ring extends into the bearing mounting hole and is abutted against the inner wall of the bearing mounting hole and the outer ring of the bearing; a plurality of oil storage blocks are welded on the inner wall of the bearing cover at intervals, and the outer edges of the oil storage blocks extend upwards to define an oil storage tank.

Description

Permanent magnet motor

Technical Field

The invention belongs to the technical field of motors, and relates to a permanent magnet motor.

Background

The permanent magnet motor has the advantages of high power density, high efficiency, brushless performance and the like, and gradually becomes the first choice of a high-speed motor. When the motor works, various losses need to be converted into heat, so that the internal temperature of the permanent magnet motor is increased, and the magnetism is easily influenced by overhigh temperature. There is serious heat dissipation problem in present solid rotor motor, and the inside air circulation of motor flows when solving the heat dissipation problem and mainly adopting the fan leaf that sets up on the pivot end ring to make the rotor rotatory, takes the casing to distribute away with the heat that stator and rotor produced, but inside air flow is obstructed easily, and the circulation mobility is relatively poor, ventilates unobviously, not only does not reduce the temperature rise, still makes motor efficiency hang down, and life subtracts the weak point.

In the prior art, the permanent magnet motor includes, according to the position of the permanent magnet on the rotor: surface mount, in-cell, and claw pole types. Wherein the manufacturing process of surface-mounted rotor structure is simple, low cost, wide application, for high-speed permanent magnet motor, some electric motor rotor adopt surface-mounted electric motor rotor, its electric motor rotor generally includes the sheath, the permanent magnet, the iron core, the apparatus further comprises a rotating shaft, the end plate, the iron core cover is in the pivot, the permanent magnet is located the iron core outside, the sheath is located the radial outside of permanent magnet, the permanent magnet is wrapped, the end plate is located permanent magnet axial both sides, in order to reduce eddy current loss and improve the intensity of sheath, the sheath generally is nonmetal, because nonmetal material's coefficient of thermal expansion is smaller, can't carry out interference fit with the shrink fit method, when permanent magnet motor rotational speed is high, permanent magnet and nonmetal sheath can take place the separation, lead to the rotor can not normally work. The arrangement mode of the permanent magnet has correlation influence on the heat dissipation of the rotor.

In addition, when the internal temperature of the motor rises and the heat is conducted to the bearings at the two ends of the rotor, the lubricating oil sealed in the bearings leaks due to the reduction of the viscosity of the temperature rise, so that the friction resistance of the bearings is increased, the power of the motor is reduced, and the motor is damaged in severe cases, which is a problem to be solved by the person skilled in the art.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a permanent magnet motor which is used for solving the heat dissipation problem of the permanent magnet motor and prolonging the service life of the permanent magnet motor.

The purpose of the invention can be realized by the following technical scheme:

the permanent magnet motor comprises a motor shell, a stator, a rotor, a motor rotating shaft and end covers, wherein the stator and the rotor are arranged in a shell cavity of the motor shell, the end covers are locked and fixed at the front end and the rear end of the motor shell, the stator comprises a stator core and a stator winding arranged on the stator core, the rotor comprises a rotor core and a permanent magnet arranged on the rotor core, the motor rotating shaft penetrates through and fixes the rotor core and is connected with the end covers, a fan is arranged outside the end cover at the rear end of the motor shell, the fan is coaxially fixed on the motor rotating shaft, a grid-shaped protective cover is arranged outside the fan, and the protective cover is fixedly connected with the end covers; the permanent magnet motor also comprises a heat dissipation frame, wherein the heat dissipation frame is positioned between the motor shell and the stator, the stator core is fixed on the heat dissipation frame, the heat dissipation frame is fixed on the inner wall of the motor shell, a heat dissipation pipe is arranged in the heat dissipation frame, a heat dissipation medium flows in the heat dissipation pipe, and the heat dissipation medium is water or oil; the end cover comprises an end cover body and a bulge part axially extending inwards from the end cover body, the bulge part is provided with a shaft hole matched with the motor rotating shaft, and the end cover body is provided with a bearing cover mounting hole and a bearing mounting hole which are communicated with the shaft hole; the bearing cover mounting holes, the bearing mounting holes and the shaft holes are sequentially distributed from outside to inside, bearings are mounted in the bearing mounting holes and form interference fit with the bearings, bearing covers are fixedly arranged in the bearing cover mounting holes and cover the bearings, through holes for the motor rotating shaft to penetrate through are formed in the centers of the bearing covers, the bearing covers are further provided with a plurality of mounting holes, the mounting holes are uniformly formed in the inner sides of the edges of the bearing covers, and the bearing covers are fixed with the end cover body through screws; the outer wall of the bearing cover is flush with the outer wall of the end cover body; the inner wall of the bearing cover is provided with a press ring which protrudes inwards, the thickness of the bearing is smaller than the depth of the bearing mounting hole, and the press ring extends into the bearing mounting hole and is abutted against the inner wall of the bearing mounting hole and the outer ring of the bearing; a plurality of oil storage blocks are welded on the inner wall of the bearing cover at intervals, the axial length of each oil storage block is smaller than that of the compression ring, and the outer edge of each oil storage block extends upwards to define an oil storage tank.

In the above-mentioned permanent magnet motor, the heat dissipation frame includes an inner frame and an outer frame, the outer frame is sleeved on the inner frame, and the heat dissipation pipe is located between the outer frame and the inner frame and is wound on the inner frame; the inner wall of the inner frame is convexly provided with a first wedge block, the outer wall of the stator iron core is provided with a first clamping groove matched with the first wedge block, the stator iron core is pressed in the inner frame, and each first wedge block of the inner frame is clamped in a corresponding first clamping groove; the inner wall of the motor shell is convexly provided with a second wedge block, the outer wall of the outer frame is provided with a second clamping groove matched with the second wedge block, the heat dissipation frame is pressed in the motor shell, and each second wedge block of the motor shell is clamped into the corresponding second clamping groove.

In the permanent magnet motor, the number of the first clamping grooves is twice that of the first wedges, the distance between every two adjacent wedges is twice that of the first clamping grooves, the radial length of each wedge is larger than the depth of each clamping groove, and a ventilation gap is formed between the outer wall of the stator core and the inner wall of the inner frame.

In the permanent magnet motor, the number of the second clamping grooves is the same as that of the second wedges, and the outer frame is attached to the inner wall of the motor shell.

In the above permanent magnet motor, the heat dissipation frame further includes end rings at both ends, the end rings are provided with mounting holes corresponding to the inner frame and the outer frame, the corresponding positions of the inner frame and the outer frame are also provided with mounting holes corresponding to the end rings, and the inner frame and the outer frame are locked and fixed with the end rings.

In the permanent magnet motor, the end rings are provided with outlet nozzles, one end of the radiating pipe penetrates out of the outlet nozzle of one end ring and is connected with a liquid inlet pipe, and the other end of the radiating pipe penetrates out of the outlet nozzle of the other end ring and is connected with a liquid outlet pipe.

In the above permanent magnet motor, the outer wall of the motor case has the heat radiating fins.

Compared with the prior art, the technical scheme has the advantages that:

1. set up the heat dissipation frame between motor casing and stator, be equipped with the cooling tube in the heat dissipation frame, the produced heat of stator can be given for the heat dissipation frame, and the heat is absorbed by the radiating medium in the cooling tube, distributes away the heat through the cooling tube to improve the radiating efficiency of stator, avoid the temperature rise too high, avoid the heat to gather on the stator winding.

2. The quantity of stator core draw-in groove one is the twice of the quantity of heat dissipation frame wedge piece one, all has an empty draw-in groove one between per two block positions, is favorable to the air to flow to the other end from stator core's one end through empty draw-in groove one, has improved the air permeability of stator core itself to do not paste mutually and form the ventilation gap between stator core's outer wall and the inner wall of heat dissipation frame, be favorable to further improving stator core's air permeability.

3. The end cover is provided with an oil storage block, when lubricating oil in the bearing is thrown out due to the reduction of temperature rise viscosity, the lubricating oil can be thrown into the oil storage tank and collected by the oil storage tank due to the existence of the oil storage block, and the collected lubricating oil can be used for lubrication at a later stage.

Drawings

Fig. 1 is a schematic structural view of a permanent magnet motor of the present invention.

Fig. 2 is a partially enlarged schematic view of fig. 1.

Fig. 3 is a schematic end view of a heat dissipation frame of a permanent magnet motor of the present invention.

Fig. 4 is a schematic structural diagram of a heat dissipation frame of a permanent magnet motor according to the present invention.

Fig. 5 is a schematic view of a stator core of a permanent magnet motor according to the present invention.

Fig. 6 is a partially enlarged view of a motor housing of the permanent magnet motor of the present invention.

Fig. 7 is a schematic cycle diagram of a heat sink of the permanent magnet motor of the present invention.

Fig. 8 is a schematic structural view of an end cover of a permanent magnet motor of the present invention.

Fig. 9 is a schematic structural view of a bearing cap of the permanent magnet motor of the present invention.

Fig. 10 is a partially enlarged schematic view of fig. 9.

Fig. 11 is a schematic view of a rotor core of a permanent magnet motor according to the present invention.

Fig. 12 is a schematic structural view of an end plate of the permanent magnet motor of the present invention.

In the figure, 1, a motor shell; 2. a stator; 3. a rotor; 4. a motor shaft; 5. an end cap; 6. a stator core; 7. a stator winding; 8. a rotor core; 9. a permanent magnet; 10. a fan; 11. a protective cover; 12. a heat dissipation frame; 13. a radiating pipe; 14. an inner frame; 15. an outer frame; 16. a first wedge block; 17. a first clamping groove; 18. a second wedge block; 19. a second clamping groove; 20. an end ring; 21. an outlet pipe orifice; 22. a liquid inlet pipe; 23. a liquid outlet pipe; 24. a heat sink; 25. an end cap body; 26. a projection; 27. a shaft hole; 28. a bearing cap mounting hole; 29. a bearing mounting hole; 30. a bearing; 31. a bearing cap; 32. pressing a ring; 33. an oil storage block; 34. an oil storage tank; 35. a liquid storage tank; 36. a reflux tank; 37. a cooling mechanism; 38. flanging part; 39. a bayonet; 40. a step portion; 41. a clamping block; 42. an explosion-proof junction box; 43. an outgoing line; 44. a power line; 45. a rotor cavity; 46. a ventilation channel; 47. and an end plate.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1 to 12, the present invention provides a permanent magnet motor, which includes a motor housing 1, a stator 2, a rotor 3, a motor shaft 4 and end caps 5, wherein the stator 2 and the rotor 3 are disposed in a housing cavity of the motor housing 1, the end caps 5 are locked and fixed at front and rear ends of the motor housing 1, the stator 2 is fixedly connected to the motor housing 1, the stator 2 includes a stator core 6 and a stator winding 7 disposed on the stator core 6, the stator 2 has an axial stator cavity, and the rotor 3 is disposed in the stator cavity and forms a rotation gap with the stator 2. Rotor 3 includes rotor core 8 and sets up permanent magnet 9 on rotor core 8, and rotor core 8 has axial rotor chamber 45, and motor shaft 4 wears to establish rotor chamber 45 and passes through the key with rotor core 8 and fix, and motor shaft 4's both ends are worn to establish end cover 5 respectively and are rotated with end cover 5 and link to each other.

The fan 10 is arranged outside the end cover 5 at the rear end of the motor shell 1, the end cover 5 at the front end of the motor shell 1 is called a front end cover 5, the end cover 5 at the rear end of the motor shell 1 is called a rear end cover 5, the fan 10 is coaxially fixed on the motor rotating shaft 4, a grid-shaped protective cover 11 is arranged outside the fan 10, the fan 10 is surrounded by the protective cover 11, the protective cover 11 is fixedly connected with the rear end cover 5, and the fan 10 synchronously rotates along with the motor rotating shaft 4 to push air to flow, so that the ventilation effect is achieved inside the motor shell 1, and the temperature rise is reduced.

It is worth mentioning that the permanent magnet motor further comprises a heat dissipation frame 12, the heat dissipation frame 12 is located between the motor housing 1 and the stator 2, the stator 2 is fixedly connected with the motor housing 1 through the heat dissipation frame 12, the stator core 6 is fixed on the heat dissipation frame 12, the heat dissipation frame 12 is fixed on the inner wall of the motor housing 1, a heat dissipation pipe 13 is arranged in the heat dissipation frame 12, a heat dissipation medium flows in the heat dissipation pipe 13, and the heat dissipation medium is water or oil. When the motor works, the heat generated by the stator 2 can be transmitted to the heat dissipation frame 12, and is absorbed by the heat dissipation medium in the heat dissipation pipe 13, and then the heat is dissipated, so that the heat dissipation efficiency of the stator 2 is improved, and the overhigh temperature rise is avoided.

Specifically, the heat dissipating frame 12 includes an inner frame 14 and an outer frame 15, the outer frame 15 is sleeved on the inner frame 14, and the heat dissipating pipe 13 is located between the outer frame 15 and the inner frame 14 and wound on the inner frame 14, so as to increase the heat absorbing area of the heat dissipating pipe 13, which is beneficial to improving the heat dissipating efficiency of the stator 2. The inner wall of the inner frame 14 is convexly provided with a first wedge block 16, the outer wall of the stator iron core 6 is provided with a first clamping groove 17 matched with the first wedge block 16, the stator iron core 6 is pressed in the inner frame 14, and each first wedge block 16 of the inner frame 14 is clamped in a corresponding first clamping groove 17, so that the stator iron core 6 and the inner frame 14 are clamped and fixed.

Preferably, the number of the first clamping grooves 17 is twice that of the first wedges 16, and the distance between two adjacent first wedges 16 is twice that of two adjacent first clamping grooves 17, so that when the stator core 6 is clamped and connected with the inner frame 14, an empty clamping groove 17 is arranged between every two clamping parts, air can flow from one end of the stator core 6 to the other end through the empty clamping groove 17, and ventilation of the stator core 6 is improved.

Optionally, the radial length of the wedges one 16 is greater than the depth of the slots one 17, and when the stator core 6 is in clamping connection with the inner frame 14, the outer wall of the stator core 6 is not attached to the inner wall of the inner frame 14 to form a ventilation gap, so that the ventilation of the stator core 6 is further improved.

Correspondingly, the inner wall of the motor shell 1 is convexly provided with a second wedge 18, the outer wall of the outer frame 15 is provided with a second clamping groove 19 matched with the second wedge 18, the heat dissipation frame 12 is pressed in the motor shell 1, and each second wedge 18 of the motor shell 1 is clamped into the corresponding second clamping groove 19, so that the heat dissipation frame 12 is fixedly connected with the motor shell 1. The number of the second clamping grooves 19 is the same as that of the second wedges 18, and the outer frame 15 is attached to the inner wall of the motor shell 1, so that the heat transfer efficiency is improved. The outer wall of the motor housing 1 has heat dissipation fins 24, and the heat dissipation frame 12 can transfer heat to the motor housing 1 to dissipate heat from the motor housing 1.

Furthermore, the heat dissipation frame 12 further includes end rings 20 at two ends, the end rings 20 are provided with mounting holes corresponding to the inner frame 14 and the outer frame 15, corresponding mounting holes are also provided at corresponding positions of the inner frame 14 and the outer frame 15, the mounting holes are used for screws to pass through, the inner frame 14 and the outer frame 15 are locked and fixed with the end rings 20, and the end rings 20 are connected with the inner frame 14 and the outer frame 15 through the screws, so as to cover the two ends of the heat dissipation frame 12, so that the heat dissipation frame 12 is in an annular closed structure.

Alternatively, the heat dissipation medium in the heat dissipation pipe 13 may be in a non-circulating state, i.e. the heat dissipation medium is encapsulated in the heat dissipation pipe 13, and the heat absorption performance of the heat dissipation medium is good, so that the heat is rapidly diffused from the direction of the stator 2 to the direction of the motor housing 1, and the heat is prevented from accumulating on the stator winding 7.

Preferably, the end rings 20 are provided with the outlet pipe openings 21, one end of the radiating pipe 13 penetrates out of the outlet pipe opening 21 of one of the end rings 20 and is connected with an inlet pipe 22, the other end of the radiating pipe 13 penetrates out of the outlet pipe opening 21 of the other end ring 20 and is connected with an outlet pipe 23, the inlet pipe 22 and the outlet pipe 23 are both located outside the motor housing 1, the inlet pipe 22 is connected with a liquid storage tank 35, the outlet pipe 23 is connected with a return tank 36, a cooling mechanism 37 is arranged in the return tank 36, the return tank 36 is connected with the liquid storage tank 35, the radiating medium in the radiating pipe 13 is in a circulating flow state, the liquid storage tank 35 contains the radiating medium, the radiating medium in the liquid storage tank 35 is input into the radiating pipe 13, the radiating medium absorbs heat and is output from the outlet pipe 23 and flows to the return tank 36, when passing through the cooling mechanism 37 in the return tank 36, the heat of the radiating medium is input into the liquid storage tank 35 again, so as to form circulating flow for use.

Interior frame 14 and outrigger 15 adopt non-magnetic heat conduction material to make, can not disturb magnetism, and heat conductivility is good moreover, and interior frame 14 can transmit the heat for cooling tube 13 fast, and outrigger 15 can transmit the heat on cooling tube 13 for motor casing 1 fast again, realizes that thermal outside transmission gives off.

Preferably, end cover 5 includes end cover body 25 and the bulge 26 of the inside axial extension of end cover body 25, and bulge 26 is inside towards the motor, and end cover body 25 and bulge 26 are integrated into one piece, and bulge 26 offers and motor shaft 4 assorted shaft hole 27, and motor shaft 4 forms the flame proof face with the shaft hole 27 of bulge 26. The end cover body 25 is provided with a bearing cover mounting hole 28 and a bearing mounting hole 29 which are communicated with the shaft hole 27, the bearing cover mounting hole 28, the bearing mounting hole 29 and the shaft hole 27 are sequentially arranged from outside to inside, the inner diameter of the bearing cover mounting hole 28 is larger than that of the bearing mounting hole 29, and the inner diameter of the bearing mounting hole 29 is larger than that of the shaft hole 27. The bearing 30 is arranged in the bearing mounting hole 29 and forms interference fit with the bearing, and the end cover 5 is fixed with the outer ring of the bearing 30. The bearing cover 31 is fixedly arranged in the bearing cover mounting hole 28, the bearing cover 31 covers the bearing 30, a through hole for the motor rotating shaft 4 to penetrate through is formed in the center of the bearing cover 31, the bearing cover 31 is further provided with a plurality of mounting holes, the mounting holes are uniformly formed in the inner side of the edge of the bearing cover 31, the corresponding position of the end cover body 25 is provided with the mounting hole corresponding to the bearing cover 31, and the bearing cover 31 is fixed with the end cover body 25 through a screw.

The outer wall of the bearing cap 31 is flush with the outer wall of the end cap body 25 to make the structure more compact. The inner wall of the bearing cover 31 is provided with a press ring 32 protruding inwards, the press ring 32 is integrally formed on the end cover body 25, the thickness of the bearing 30 is smaller than the depth of the bearing mounting hole 29, the press ring 32 extends into the bearing mounting hole 29 and abuts against the inner wall of the bearing mounting hole 29 and the outer ring of the bearing 30, and the press ring 32 and the bearing mounting hole 29 form interference fit and further fix the bearing 30. The motor shaft 4 sequentially penetrates through the shaft hole 27, the bearing hole and the through hole of the bearing cover 31, the front end of the motor shaft 4 penetrates through the front end cover 5 to form an output end of the motor shaft 4, and the rear end of the motor shaft 4 penetrates through the rear end cover 5 to be used for assembling the fan 10.

It is worth mentioning that a plurality of oil storage blocks 33 are welded on the inner wall of the bearing cover 31 at intervals, the axial length of the oil storage blocks 33 is smaller than that of the pressing ring 32, a gap is reserved between the oil storage blocks 33 and the end face of the bearing 30, so that the rotation of the inner ring of the bearing 30 is not affected, the outer edges of the oil storage blocks 33 extend upwards to define an oil storage groove 34, when the lubricating oil in the bearing 30 is thrown out due to the temperature rise and the viscosity is reduced, the lubricating oil can be thrown into the oil storage groove 34 due to the existence of the oil storage blocks 33 and is collected by the oil storage groove 34, and the collected lubricating oil can be used for lubrication at a later stage.

Further, the end cover body 25 has the protruding turn-ups portion 38 of axial, turn-ups portion 38 extends in the tip of end cover body 25 integratively, turn-ups portion 38 is towards motor casing 1, a plurality of bayonet sockets 39 have been seted up uniformly to the inner wall of end cover body 25, the both ends of motor casing 1 are step portion 40, the terminal surface of step portion 40 is towards end cover body 25, and the terminal surface of step portion 40 has a plurality of convex fixture blocks 41, fixture block 41 matches with bayonet sockets 39 one by one, the inner wall of end cover body 25 presses on the terminal surface of step portion 40, each fixture block 41 all blocks into a corresponding bayonet socket 39, turn-ups portion 38 presses on the step surface of step portion 40, corresponding radial mounting hole has all been seted up to turn-ups portion 38 and step portion 40, turn-ups portion 38 and step portion 40 are fixed through screw locking, namely, end cover 5 and motor casing 1 are fixed through screw locking in footpath, meet fixedly through the block in the axial, make the fixing of end cover 5 with motor casing 1, the whole rigidity of motor is promoted, be favorable to reducing the noise that the motor during operation produced.

The number of mounting holes in the burring portion 38 and the step portion 40 is even. Specifically, the number of the mounting holes on the flanging part 38 and the stepped part 40 is 6 or 8, and the mounting holes are distributed at even intervals, so that the stress is even.

The motor shell 1 is provided with a wire outlet, the upper end face of the motor shell 1 is provided with an explosion-proof junction box 42, the explosion-proof junction box 42 is positioned at the upper end of the wire outlet, and a leading-out wire 43 of the stator winding 7 penetrates out of the wire outlet and penetrates into the explosion-proof junction box 42 to be electrically connected with a power wire 44 penetrating into the explosion-proof junction box 42 from the outside. The motor further comprises a base on which the motor housing 1 is mounted. In addition, the motor shell 1 is made of a non-magnetic cast aluminum alloy material; the stator winding 7 is made of high-temperature resistant enameled wires; the permanent magnet 9 is made of high-temperature resistant neodymium iron boron permanent magnet material.

Rotor cavity 45 that matches with motor shaft 4 is seted up at rotor core 8's center, motor shaft 4 passes through the key with rotor core 8 and fixes, axial mounting groove has still been seted up on rotor core 8, the mounting groove is symmetry evenly distributed around rotor cavity 45, permanent magnet 9 encapsulates in the mounting groove, and the encapsulation has multistage permanent magnet 9 in every mounting groove, a ventilation passageway 46 has all been seted up between every two adjacent mounting grooves, the quantity of permanent magnet 9 is the even number, rotor core 8 is formed by the lamination of multi-disc rotor punching, rotor core 8's both ends are fixed by end plate 47 locking, set up the ventilation hole that is linked together with ventilation passageway 46 and the pivot hole 27 that communicates with rotor cavity 45 on the end plate 47, ventilation passageway 46 has improved the inside air permeability of rotor, thereby make the air current flow through from the rotor inside and take away the inside heat of rotor, solve the rotor temperature rise problem.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although the motor case 1 is used here more; a stator 2; a rotor 3; a motor shaft 4; an end cap 5; a stator core 6; a stator winding 7; a rotor core 8; a permanent magnet 9; a fan 10; a protective cover 11; a heat dissipation frame 12; a radiating pipe 13; an inner frame 14; an outer frame 15; a first wedge block 16; a first clamping groove 17; a second wedge block 18; a second clamping groove 19; an end ring 20; an outlet pipe orifice 21; a liquid inlet pipe 22; a liquid outlet pipe 23; a heat sink 24; an end cap body 25; a projection 26; a shaft hole 27; bearing cap mounting holes 28; bearing mounting holes 29; a bearing 30; a bearing cap 31; a pressure ring 32; an oil reservoir block 33; an oil reservoir 34; a liquid storage tank 35; a reflux drum 36; a cooling mechanism 37; a hem portion 38; a bayonet 39; a step portion 40; a latch 41; an explosion-proof junction box 42; an outgoing line 43; a power supply line 44; a rotor chamber 45; a ventilation passage 46; end plate 47, etc., but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims

1. The permanent magnet motor comprises a motor shell, a stator, a rotor, a motor rotating shaft and end covers, wherein the stator and the rotor are arranged in a shell cavity of the motor shell, the end covers are locked and fixed at the front end and the rear end of the motor shell, the stator comprises a stator core and a stator winding arranged on the stator core, the rotor comprises a rotor core and a permanent magnet arranged on the rotor core, and the motor rotating shaft penetrates through and fixes the rotor core and is connected with the end covers; the permanent magnet motor also comprises a heat dissipation frame, wherein the heat dissipation frame is positioned between the motor shell and the stator, the stator core is fixed on the heat dissipation frame, the heat dissipation frame is fixed on the inner wall of the motor shell, a heat dissipation pipe is arranged in the heat dissipation frame, a heat dissipation medium flows in the heat dissipation pipe, and the heat dissipation medium is water or oil; the end cover comprises an end cover body and a bulge part axially extending inwards from the end cover body, the bulge part is provided with a shaft hole matched with the motor rotating shaft, and the end cover body is provided with a bearing cover mounting hole and a bearing mounting hole which are communicated with the shaft hole; the bearing cover mounting holes, the bearing mounting holes and the shaft holes are sequentially distributed from outside to inside, bearings are mounted in the bearing mounting holes and form interference fit with the bearings, bearing covers are fixedly arranged in the bearing cover mounting holes and cover the bearings, through holes for the motor rotating shaft to penetrate through are formed in the centers of the bearing covers, the bearing covers are further provided with a plurality of mounting holes, the mounting holes are uniformly formed in the inner sides of the edges of the bearing covers, and the bearing covers are fixed with the end cover body through screws; the outer wall of the bearing cover is flush with the outer wall of the end cover body; the inner wall of the bearing cover is provided with a press ring which protrudes inwards, the thickness of the bearing is smaller than the depth of the bearing mounting hole, and the press ring extends into the bearing mounting hole and is abutted against the inner wall of the bearing mounting hole and the outer ring of the bearing; a plurality of oil storage blocks are welded on the inner wall of the bearing cover at intervals, the axial length of each oil storage block is smaller than that of the compression ring, and the outer edges of the oil storage blocks extend upwards to define an oil storage groove; the radiating frame comprises an inner frame and an outer frame, the outer frame is sleeved on the inner frame, and the radiating pipe is positioned between the outer frame and the inner frame and wound on the inner frame; the inner wall of the inner frame is convexly provided with a first wedge block, the outer wall of the stator iron core is provided with a first clamping groove matched with the first wedge block, the stator iron core is pressed in the inner frame, and each first wedge block of the inner frame is clamped in a corresponding first clamping groove; the inner wall of the motor shell is convexly provided with a second wedge block, the outer wall of the outer frame is provided with a second clamping groove matched with the second wedge block, the heat dissipation frame is pressed in the motor shell, and each second wedge block of the motor shell is clamped into the corresponding second clamping groove; the number of the first clamping grooves is twice that of the first wedges, the distance between every two adjacent first wedges is twice that of the first clamping grooves, the radial length of each first wedge is larger than the depth of each first clamping groove, and a ventilation gap is formed between the outer wall of the stator core and the inner wall of the inner frame.

2. The permanent magnet motor according to claim 1, wherein the number of the second clamping grooves is the same as that of the second wedges, and the outer frame abuts against the inner wall of the motor shell.

3. The permanent magnet motor of claim 1, wherein the heat dissipation frame further comprises end rings at two ends, the end rings are provided with mounting holes corresponding to the inner frame and the outer frame, the corresponding positions of the inner frame and the outer frame are also provided with mounting holes corresponding to the end rings, and the inner frame and the outer frame are locked and fixed with the end rings.

4. The permanent magnet motor of claim 1, wherein the end rings are provided with outlet openings, one end of the heat dissipating pipe is extended out of the outlet opening of one of the end rings and connected to an inlet pipe, and the other end of the heat dissipating pipe is extended out of the outlet opening of the other end ring and connected to an outlet pipe.

5. The permanent magnet electric machine of claim 1 wherein the outer wall of the machine housing has fins.