CN117424393A - Mixed-cooling double-rotor radial magnetic flux hub motor - Google Patents

Mixed-cooling double-rotor radial magnetic flux hub motor Download PDF

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Publication number
CN117424393A
CN117424393A CN202311438968.8A CN202311438968A CN117424393A CN 117424393 A CN117424393 A CN 117424393A CN 202311438968 A CN202311438968 A CN 202311438968A CN 117424393 A CN117424393 A CN 117424393A
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CN
China
Prior art keywords
driving end
rotor
cooling
end cover
stator
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Pending
Application number
CN202311438968.8A
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Chinese (zh)
Inventor
陈起旭
李维吕
李国丽
王群京
邓文哲
钱喆
孙泽辉
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Anhui University
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Anhui University
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Publication date
Application filed by Anhui University filed Critical Anhui University
Priority to CN202311438968.8A priority Critical patent/CN117424393A/en
Publication of CN117424393A publication Critical patent/CN117424393A/en
Pending legal-status Critical Current

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Abstract

The invention provides a mixed cooling double-rotor radial magnetic flux hub motor, which belongs to the field of hub motors and adopts double-rotor topology, a non-magnetic yoke segmented stator and air-water mixed cooling. The non-magnetic yoke segmented stator is positioned between the inner rotor and the outer rotor. The rotor bracket is integrated with a centrifugal cooling fan, the back iron of the inner/outer rotor is provided with rectangular ventilation holes along the axial direction, and cooling airflow at the driving end forms a circulating cooling air path through the rotor bracket and an air gap between the inner/outer sides; the stator is fixed through double-side stator tooth pressing plates, wherein the stator tooth pressing plates at the non-moving end and the end covers at the non-moving end are fixed, and the inner parts of the end covers at the two sides are respectively provided with a circumferential rectangular groove water cooling channel; the invention has more compact axial length, increases the power density of the motor and improves the heat dissipation efficiency.

Description

Mixed-cooling double-rotor radial magnetic flux hub motor
Technical Field
The invention belongs to the field of hub motors, and particularly relates to a mixed cooling dual-rotor radial magnetic flux hub motor.
Background
The traditional hub motor generally adopts end cover liquid cooling, and under the high-rotation-speed working condition, because the air flow in the motor does not flow, the heat cannot be effectively dissipated only by the aid of the end cover liquid cooling. In particular, for an in-wheel motor with compact axial space, the heat dissipation efficiency of the internal windings and the stator is low.
Conventional in-wheel motors typically employ a radial magnetic field, but generally have a relatively long axial dimension. Or an axial magnetic field is used to increase torque and power density, but with relatively high manufacturing costs and difficulties.
United states patent application US20070205682A1 (Dual Rotor Type Motor) allows the rotor to be air-cooled by passing a cooling air flow through the inside and outside of the inner rotor by means of opening holes in the circumferential direction of the inner rotor, but does not take into account the cooling of the stator assembly and has a low air-cooled cooling efficiency.
Chinese patent application CN115864768A (dual-rotor hub motor) coaxially fixes the inner rotor and the outer rotor on the rotor shell, and adopts a stator liquid cooling heat dissipation mode to pressurize the interior of the motor to prevent foreign matters from entering. But the sealing property is required to be high.
Chinese patent application CN112564340B (air-water cooled high speed motor structure with middle ventilation) adopts the heat dissipation scheme of inside forced air cooling and liquid cooling combination, through seting up the ventilation groove at stator skeleton, the hot air that passes stator core gets into the water cooling jacket and cools off, and vortex fan intercommunication water cooling jacket makes inside air cycle, can effectively dispel the heat. However, the complete cooling assembly provides the motor with a relatively long axial length, which is difficult to apply in the field of in-wheel motors.
Chinese patent application CN 110190713A (dual rotor direct-cooled motor) encloses oil cavities in the windings on both sides to effectively dissipate heat from the stator assembly, but does not take into account the heat dissipation from the rotor assembly, and the presence of the winding housing also allows the motor to have a relatively long axial length.
Chinese patent application CN 115733325A (an axial flux motor with a centrifugal fan built-in rotor and a stator oil-cooled) adopts an oil-water mixed cooling scheme of rotor integrated centrifugal fan and stator closed oil-immersed cooling, so that the heat dissipation efficiency of the internal structure is improved. The patent is suitable for low protection level (IP 21) and heavy load application, and the scheme cannot meet the situation of high protection level (IP 54 and above).
Chinese patent application CN 204131322U (a heat dissipation structure combining water cooling and air cooling for an in-wheel motor) adopts a heat dissipation mode of air-water mixed cooling, and generates cooling air flow through spiral stripes on the inner wall of the casing, and the cooling air flow exchanges heat with cooling water pipes on two sides of the flange. But the cooling air flow generated by the spiral stripes on the inner wall is smaller, and the heat dissipation efficiency is lower in high-power application occasions. The mode of centrifugal cooling fan is arranged to this scheme adoption axial, strengthens the cooling air flow output for both sides air current circulation efficiency.
Chinese patent application CN 106357053B (a hub motor driving system adopting a spraying and air cooling mixed cooling mode) adopts a mixed cooling mode that an oil spraying device and rotor support mounting fan blades are arranged on the inner wall of a shell, so that the interior of a motor can be effectively cooled, but the arrangement of an oil duct occupies a larger radial space, and the requirement on the tightness of the interior of the motor is higher; the cooling fan is arranged inside the rotor bracket, and can not effectively dissipate heat of the stator assembly.
Chinese patent application CN 217508373U (a wheel hub motor with mixed cooling structure) adopts the heat dissipation mode of air-water mixed cooling, arranges the circulation wind channel at stator support section of thick bamboo and carries out the forced air cooling heat dissipation to stator module, and stator support section of thick bamboo integrated liquid cooling U type pipe carries out the water-cooling heat dissipation simultaneously, can make the effective heat dissipation of stator armature assembly. However, the hybrid cooling devices are all positioned on the stator support cylinder, so that the rotor assembly cannot be effectively cooled.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a mixed cooling double-rotor radial magnetic flux hub motor which adopts double-rotor topology, a non-yoke segmented stator and air-water mixed cooling. The invention has more compact axial length, increases the power density of the motor and improves the heat dissipation efficiency.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a mixed cooling double-rotor radial magnetic flux hub motor adopts an inner/outer double-rotor topology, and a rotor is provided with surface-mounted radial sectional permanent magnets, wherein the inner/outer permanent magnets are fixed on a rotor support through inner/outer rotor back irons, and a centrifugal cooling fan is axially arranged on the rotor support. The stator is characterized in that stator iron cores are fixed by stator tooth pressing plates at two sides, stator windings are wound on the stator iron cores, the non-driving end stator tooth pressing plates and the non-driving end cover are integrated into a whole, and rectangular liquid cooling grooves along the circumferential direction are formed in the two side end covers. The hub motor adopts fractional slot concentrated windings of 20 poles and 18 slots.
Further, rectangular ventilation grooves are formed in the inner/outer rotor back iron along the inner/outer rotor contact surface, and an axial cooling air path generated by the centrifugal cooling fan firstly passes through the inner/outer air gaps, and then passes through the rectangular ventilation grooves formed in the inner/outer rotor back iron to form a circulating air path. The cooling path enables the cooling air path to fully contact the permanent magnet, the stator core, the inner/outer rotor back iron and the rotor support, and the internal structure can be effectively cooled.
Further, rectangular groove water channels are formed in the driving end/non-driving end cover along the circumferential direction, water inlets and water outlets are formed in the non-driving end cover, a water inlet channel and a water outlet channel are formed in the casing along the circumferential direction, cooling water is led in through the water inlets of the non-driving end cover, firstly flows through the cooling channels of the non-driving end cover, then reaches the driving end cover through the casing water inlet channel, completely passes through the driving end cover, and then flows out to the water outlets of the non-driving end cover through the casing water outlet channel, and a circulating cooling waterway of the two side end covers is formed.
Further, the circulating cooling air path can be in contact with the end covers at two sides, and can perform full heat exchange with the liquid cooling end covers, so that the liquid cooling heat dissipation efficiency is accelerated while internal air circulates.
Further, the hub motor adopts a double-rotor topology, and the inner rotor and the outer rotor are coaxially arranged, so that the torque and the power density are effectively increased.
The invention has the beneficial effects that:
(1) In terms of performance improvement, compared with the scheme of the traditional inner rotor hub motor, the dual-rotor topology adopted by the invention generates radial magnetic fields, so that the air gap magnetic flux density is effectively increased, and the torque and the power density are improved.
(2) In the aspect of heat radiation capability, compared with the traditional liquid cooling hub motor scheme, the invention adopts the mixed cooling scheme of external water cooling and internal air cooling, and three circulating air paths formed by the internal centrifugal cooling fans strengthen the air flow circulation in the motor and effectively improve the water cooling heat radiation efficiency while the end covers at two sides are continuously water-cooled.
Drawings
Fig. 1 is a schematic diagram of a stator assembly 100 of a hybrid cooled dual rotor radial flux in-wheel motor according to the present invention, wherein 101 is a first screw, 102 is a drive end stator tooth platen, 103 is a stator core, and 104 is a winding.
Fig. 2 (a) is a schematic diagram of a rotor assembly 200 of a hybrid cooled dual rotor radial flux hub motor according to the present invention, wherein 201 is an inner oil seal, 202 is an outer oil seal, 203 is an inner rotor back iron, 204 is an inner permanent magnet, 205 is an outer rotor back iron, 206 is an outer permanent magnet, 207 is a centrifugal cooling fan, 208 is a rotor support, 209 is a deep groove ball bearing, 210 is a main shaft, 211 is a second screw, 212 is a third screw, 213 is an outer rotor ventilation groove, 214 is an inner rotor ventilation groove, and 215 is a fourth screw.
Fig. 2 (b) shows a wind path structure of a hybrid cooling dual-rotor radial flux hub motor according to the present invention, wherein 216 is a first wind path, 217 is a second wind path, 218 is a third wind path, 219 is an outer air gap, and 220 is an inner air gap.
Fig. 3 (a) is a schematic diagram of a housing assembly 300 of a hybrid cooled dual rotor radial flux hub motor according to the present invention, wherein 301 is a fifth screw, 302 is a drive end bearing housing, 303 is a sixth screw, 304 is a drive end cover, 305 is a housing, 306 is a non-drive end cover, 307 is a seventh screw, 308 is a non-drive end bearing housing, 309 is a water inlet, 310 is a water outlet, 311 is a water channel seal sleeve.
Fig. 3 (b) is a schematic water path structure of a dual-rotor radial flux hub motor with hybrid cooling according to the present invention, wherein 312 is a housing water inlet channel, 313 is a housing water outlet channel, 314 is a driving end cover water inlet, 315 is a driving end cover water outlet, 316 is a winding lead-out wire, 317 is a non-driving end water cooling channel, and 318 is a driving end water cooling channel.
Fig. 4 is a schematic diagram of a hub assembly 400 of a hybrid cooled dual rotor radial flux in-wheel motor of the present invention, wherein 401 is an eighth screw, 402 is a ninth screw, 403 is a brake assembly, 404 is a hub, and 405 is an in-wheel motor.
Fig. 5 is an exploded view of the overall structure of a hybrid cooled dual rotor radial flux in-wheel motor of the present invention.
Fig. 6 is a motor cross-sectional view of a hybrid cooled dual rotor radial flux in-wheel motor of the present invention.
Fig. 7 is a sectional view showing the overall structure of a hybrid-cooled dual-rotor radial flux in-wheel motor according to the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The invention adopts double-rotor topology, the rotors on two sides adopt surface-mounted permanent magnets, and the inner rotor and the outer rotor are respectively fixed on a rotor bracket through inner rotor back iron and outer rotor back iron; the rotor bracket is fixed on the main shaft and is integrated with the centrifugal cooling fan; the stator is of a non-magnetic yoke block structure formed by axially laminating silicon steel sheets and is fixed by a driving end and a non-driving end tooth pressing plate, wherein the non-driving end tooth pressing plate is integrated on a non-driving end cover, and a water cooling channel is arranged in the non-driving end cover; the radial flux motor employs fractional slot concentrated windings of 20 poles 18 slots.
As shown in fig. 5 and 7, a hybrid cooled dual rotor radial flux hub motor of the present invention includes a stator assembly 100, a rotor assembly 200, a housing assembly 300, and a hub assembly 400. The stator assembly 100 is fixed to the housing assembly 300 by a seventh screw 307; rotor assembly 200 is supported by spindle 210 and is retained on housing assembly 300 by drive end bearing housing 302 and non-drive end bearing housing 308; the hub assembly 400 is secured to the housing assembly 300 by a ninth screw 402.
As shown in fig. 1 and 6, the stator assembly 100 includes a first screw 101, a driving end stator tooth platen 102, a stator core 103, and windings 104. The first screw 101 fixes the driving end stator tooth presser 102 on the stator core 103, and the winding 104 is wound on the stator core 103.
As shown in fig. 2 (a), fig. 6, the rotor assembly 200 includes an inner oil seal 201, an outer oil seal 202, an inner rotor back iron 203, an inner permanent magnet 204, an outer rotor back iron 205, an outer permanent magnet 206, a centrifugal cooling fan 207, a rotor bracket 208, a deep groove ball bearing 209, a main shaft 210, a second screw 211, a third screw 212, an outer rotor ventilation groove 213, an inner rotor ventilation groove 214, and a fourth screw 215. The inner oil seal 201 and the outer oil seal 202 are installed on a rotor support 208, an inner permanent magnet 204 is attached to the surface of an inner rotor back iron 203, an outer permanent magnet 206 is attached to the surface of an outer rotor back iron 205, the inner rotor back iron 203 and the outer rotor back iron 205 are respectively fixed through a fourth screw 215 and a third screw 212, a centrifugal cooling fan 207 is fixed on the rotor support 208 through a second screw 211, and a deep groove ball bearing 209 is installed on a main shaft 210.
The wind path of the invention is designed as follows: referring to fig. 2 (a) and 2 (b), the main cooling air flow generated by the centrifugal cooling fan 207 first passes through the inner air gap 220, and then the air flow is split to form three air paths, namely, a first air path 216, a second air path 217 and a third air path 218 after passing through the outer air gap 219, the outer rotor ventilation groove 213 and the inner rotor ventilation groove 214, and finally the three cooling air flows are converged to the centrifugal cooling fan 207 to form a circulating air path. The three cooling air flows fully contact the inner permanent magnet 204, the outer permanent magnet 206, the stator core 103 and the windings 104. The outer air gap 219 is located between the outer permanent magnet 206 and the stator core 103, the inner air gap 220 is located between the inner permanent magnet 204 and the stator core 103, the outer air gap 219 and the inner air gap 220 are coaxial, and three cooling air flows can accelerate air circulation inside the air gaps at two sides, so that heat dissipation efficiency is improved.
As shown in fig. 3 (a), fig. 6, the housing assembly 300 includes a fifth screw 301, a driving end bearing seat 302, a sixth screw 303, a driving end cover 304, a housing 305, a non-driving end cover 306, a seventh screw 307, a non-driving end bearing seat 308, a water inlet 309, a water outlet 310, and a waterway gland 311. A fifth screw 301 secures the drive end housing 302 to the drive end cap 304, a sixth screw 303 secures the drive end cap 304 and the non-drive end cap 306 to the housing 305, a seventh screw 307 secures the stator core 103 of fig. 1 to the non-drive end cap 306, and a non-drive end housing 308 is secured to the non-drive end cap 306 by the fifth screw 301. The water channel sealing sleeve 311 is installed on the casing water inlet channel 312, the casing water outlet channel 313, the driving end cover water inlet 314 and the driving end cover water outlet 315 in fig. 3 (b), and is used for sealing the water channel, and the winding outgoing line 316 is located at one side of the non-driving end cover 304.
The waterway of the invention is designed as follows: referring to fig. 3 (a) and 3 (b), the cooling water flows from the water inlet 309, flows through the non-driving end water cooling channel 317, flows into the driving end cover water inlet 314 of the driving end cover 306 through the driving end cover water inlet channel 312 on the casing 305, then reaches the driving end water cooling channel 318, flows back to the casing water outlet channel 313 on the casing 305 through the driving end cover water outlet 315 of the driving end cover 306, and finally flows out through the water outlet 310 of the non-driving end cover 304. The cooling water path flows through the end covers and the casing at two sides, wherein the non-driving end cover water cooling channel mainly cools the stator core 103 and the winding 104, the driving end cover water cooling channel mainly cools the brake component 403, and the cooling water path cooperates with the air cooling circulation of the internal centrifugal cooling fan 207 to improve the heat dissipation efficiency.
As shown in fig. 4 and 6, the hub assembly 400 includes an eighth screw 401, a ninth screw 402, a brake assembly 403, a hub 404, and a hub motor 405. Eighth screw 401 secures brake assembly 403 to hub 404 and ninth screw 402 secures brake assembly 403 to hub motor 405.

Claims (7)

1. The utility model provides a birotor radial magnetic flux in-wheel motor of hybrid cooling which characterized in that: adopting an inner/outer double-rotor topology, wherein rotors on two sides adopt surface-mounted type segmented permanent magnets, and the inner/outer rotors are respectively fixed on a rotor bracket through inner/outer rotor back irons; the rotor support is fixed on the main shaft, and the centrifugal cooling fan is integrally arranged on the rotor support along the axial direction; the stator is of a non-magnetic yoke block structure formed by axially laminating silicon steel sheets and is fixed by a driving end and a non-driving end tooth pressing plate, wherein the non-driving end tooth pressing plate is integrally integrated on a non-driving end cover, and a water cooling channel is arranged in the non-driving end cover; the stator winding is wound on the stator core; the radial flux motor employs fractional slot concentrated windings of 20 poles 18 slots.
2. A hybrid cooled dual rotor radial flux in-wheel motor as claimed in claim 1, wherein: the hub motor comprises a rotor assembly, a stator assembly, a shell assembly and a hub assembly; the rotor assembly comprises a rotor bracket, an inner/outer rotor back iron, an inner/outer permanent magnet, a main shaft and a centrifugal cooling fan; the stator assembly comprises a stator core, a stator tooth pressing plate and a winding; the shell component comprises a driving end cover, a non-driving end cover integrated with a non-driving end stator tooth pressing plate, a shell and a water cooling channel; the hub assembly comprises a hub and a brake assembly; the main shaft supports the rotor assembly, the stator assembly is fixed on the non-driving end cover, and the hub assembly is fixed on the driving end.
3. A hybrid cooled dual rotor radial flux in-wheel motor as claimed in claim 1, wherein: the method comprises the steps of adopting a cooling mode combining water cooling and air cooling, wherein a non-driving end cover cools a stator core and a winding in a water cooling mode, and a driving end cover cools a brake assembly in a water cooling mode; the centrifugal cooling fan forms three circulating air paths for cooling the inner/outer permanent magnets, the inner/outer rotor back iron, the stator core and the windings, wherein the inner/outer permanent magnets, the inner/outer rotor back iron and the windings comprise double-side air gaps, and the circulating air paths can contact the liquid cooling end cover for heat exchange.
4. A hybrid cooled dual rotor radial flux in-wheel motor as claimed in claim 2, wherein: an inner/outer double-rotor coaxial arrangement is adopted, wherein an inner air gap is formed between an inner permanent magnet and a stator core, and an outer air gap is formed between an outer permanent magnet and the stator core.
5. A hybrid cooled dual rotor radial flux in-wheel motor as claimed in claim 4, wherein: rectangular ventilation grooves are formed in the inner/outer rotor back iron along the inner/outer rotor contact surface, and a circulating cooling air path generated by the centrifugal cooling fan firstly passes through the inner/outer air gaps and then passes through the rectangular ventilation grooves formed in the inner/outer rotor back iron to form a circulating cooling air path; the circulating cooling air path is fully contacted with the permanent magnet, the stator core, the inner/outer rotor back iron and the rotor support, and the internal structure of the hub motor is effectively cooled.
6. A hybrid cooled dual rotor radial flux in-wheel motor as claimed in claim 3, wherein: rectangular groove water channels are formed in the driving end cover and the non-driving end cover along the circumferential direction, a water inlet and a water outlet are formed in the non-driving end cover, a water inlet channel and a water outlet channel are formed in the casing along the circumferential direction, cooling water is introduced into the casing through the water inlet of the non-driving end cover, the cooling water firstly flows through the circumferential rectangular groove-shaped non-driving end water cooling channel of the non-driving end cover, then flows through the casing water inlet channel to the driving end cover, and finally flows out to the water outlet of the non-driving end cover through the casing water outlet channel after completely passing through the circumferential rectangular groove-shaped driving end water cooling channel of the driving end cover, so that a circulating cooling waterway of the driving end cover and the non-driving end cover is formed.
7. A hybrid cooled dual rotor radial flux in-wheel motor as claimed in claim 4, wherein: the circulating cooling air path is in contact with the driving end cover and the non-driving end cover, and is fully in heat exchange with the driving end cover and the non-driving end cover, so that the liquid cooling heat dissipation efficiency is accelerated while internal air circulation is realized.
CN202311438968.8A 2023-10-31 2023-10-31 Mixed-cooling double-rotor radial magnetic flux hub motor Pending CN117424393A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311438968.8A CN117424393A (en) 2023-10-31 2023-10-31 Mixed-cooling double-rotor radial magnetic flux hub motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311438968.8A CN117424393A (en) 2023-10-31 2023-10-31 Mixed-cooling double-rotor radial magnetic flux hub motor

Publications (1)

Publication Number Publication Date
CN117424393A true CN117424393A (en) 2024-01-19

Family

ID=89532301

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311438968.8A Pending CN117424393A (en) 2023-10-31 2023-10-31 Mixed-cooling double-rotor radial magnetic flux hub motor

Country Status (1)

Country Link
CN (1) CN117424393A (en)

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