CN114499089A - Permanent magnet double-rotor motor - Google Patents

Permanent magnet double-rotor motor Download PDF

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Publication number
CN114499089A
CN114499089A CN202111345813.0A CN202111345813A CN114499089A CN 114499089 A CN114499089 A CN 114499089A CN 202111345813 A CN202111345813 A CN 202111345813A CN 114499089 A CN114499089 A CN 114499089A
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CN
China
Prior art keywords
stator
rotor
magnetic steel
yoke
outer rotor
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Pending
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CN202111345813.0A
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Chinese (zh)
Inventor
V·V·谢尔巴科夫
雷厉
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Individual
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K16/00—Machines with more than one rotor or stator
    • H02K16/02—Machines with one stator and two or more rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28—Layout of windings or of connections between windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation
    • H02K3/345—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation between conductor and core, e.g. slot insulation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

A permanent magnet double-rotor motor comprises a rotor connecting disc; the adjacent two outer rotor magnetic steels have different lengths along the circumferential direction, and the adjacent two outer rotor magnetic steels have gaps which are the same; the stator includes: the heat dissipation device comprises an outer stator, an inner stator, a heat dissipation part, a stator fixing seat and a bearing; the outer stator and the inner stator are fixed on the stator fixing seat; the bearing is connected with the stator fixing seat and the rotor connecting disc. According to the technical scheme, the radians of the magnetic steels of the outer rotor and the inner rotor in the double-rotor motor are different, and the longer arc-shaped magnetic steel of the outer rotor is opposite to the shorter arc-shaped magnetic steel of the inner rotor; the shorter arc-shaped magnetic steel of the outer rotor is opposite to the longer arc-shaped magnetic steel of the inner rotor; the cogging torque is further reduced, the higher torque density is ensured, the torque pulsation is reduced, and the power density of the motor is further improved.

Description

Permanent magnet double-rotor motor
Technical Field
The invention relates to the field of motors, in particular to a permanent magnet double-rotor motor.
Background
The double-rotor radial magnetic field permanent magnet motor disclosed abroad is a novel motor which is formed by sleeving an outer rotor permanent magnet motor and an inner rotor permanent magnet motor together and sharing a stator, the inner and outer rotor magnets of the motor adopt a conventional magnet structure, namely the number of the inner and outer rotor magnets of the motor is equal to the number of poles of the motor, and each magnet forms a magnetic pole of the motor, so that the essence of the low air gap magnetic density of the motor is not changed, and the further improvement of the performance of the motor is limited; meanwhile, the motor adopts a conventional magnet structure, and the generated air gap flux density waveform is trapezoidal wave, so that the phase potential waveform is also trapezoidal wave and is not suitable for the power supply of a sine alternating current power supply.
The cogging torque of the permanent magnet motor is torque generated by interaction between a permanent magnet magnetic field and a slotted iron core when a winding is not electrified, can generate adverse effect on stable operation of the motor, can generate vibration and noise, is an influence on the performance of a motor speed control and position control system, and is one of the problems needing to be considered in permanent magnet motor design. For surface type and common built-in type permanent magnet motors, the weakening measures of the cogging torque can be divided into four types: the matching of the number of the armature teeth and the number of the motor poles is changed, armature parameters are changed, parameters of the permanent magnet rotor are changed, and the influence of cogging torque is counteracted through a motor control method.
Although the existing double-rotor motor can reduce the cogging torque and the torque ripple to a certain extent by cutting a permanent magnet, a skewed pole chute, optimizing the shape of a tooth part or adopting a complex driving algorithm, the reduction of the output torque and the increase of the manufacturing difficulty cannot be avoided, so that the existing double-rotor motor has the problem of uncoordinated torque density improvement and torque ripple inhibition.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the technical problem to be solved by the present invention is to reduce torque ripple while maintaining torque density of a dual-rotor motor.
In order to achieve the above object, the present invention provides a permanent magnet dual rotor motor, comprising:
the rotor comprises an outer rotor, a stator, an inner rotor and a rotor connecting disc; wherein the stator is between the outer rotor and the inner rotor; external rotor
An outer air gap is arranged between the stator and the stator; an inner air gap is arranged between the inner rotor and the stator;
the outer rotor includes:
the outer rotor yoke is used for fixing the outer rotor magnetic steel;
n (N > =2) outer rotor magnetic steel groups which are arranged to be uniformly distributed along the circumferential direction of the cylindrical outer rotor yoke, wherein the outer rotor magnetic steel groups are 2 outer rotor magnetic steels which are arranged along the circumferential direction and have different polarities, the polarities of any two adjacent outer rotor magnetic steels are different, the lengths of any two adjacent outer rotor magnetic steels are different along the circumferential direction, and gaps between any two adjacent outer rotor magnetic steels are the same;
the inner rotor includes:
the inner rotor yoke is used for fixing the inner rotor magnetic steel;
n (N > =2) inner rotor magnetic steel groups which are uniformly distributed along the circumferential direction of the cylindrical inner rotor yoke, wherein the inner rotor magnetic steel groups are 2 inner rotor magnetic steels which are arranged along the circumferential direction and have different polarities, the polarities of any two adjacent inner rotor magnetic steels are different, and the lengths of any two adjacent inner rotor magnetic steels are different along the circumferential direction; gaps between any two adjacent inner rotor magnetic steels are the same;
the rotor connecting disc is used for fixing the outer rotor yoke and the inner rotor yoke, so that the outer rotor yoke and the inner rotor yoke have a common axis, and the rotating speeds of the outer rotor yoke and the inner rotor yoke are the same;
the outer rotor magnetic steel and the inner rotor magnetic steel correspond to each other one by one; the middle vertical plane of the longer magnetic steel on the outer rotor yoke is coplanar with the middle vertical plane of the shorter magnetic steel on the inner rotor yoke; the middle vertical plane of the shorter magnetic steel on the outer rotor yoke is coplanar with the middle vertical plane of the longer magnetic steel on the inner rotor yoke;
the stator includes: the heat dissipation device comprises an outer stator, an inner stator, a heat dissipation part, a stator fixing seat and a bearing;
the outer stator and the inner stator are fixed on the stator fixing seat; the bearing is connected with the stator fixing seat and the rotor connecting disc.
Further, the magnetic steel is magnetized in the radial direction, and the magnetic steel is of a fan-shaped, rectangular or trapezoidal cylindrical structure with the bottom surface.
Further, the outer rotor magnetic steel is arc-shaped magnetic steel along the circumferential direction.
Furthermore, the outer rotor magnetic steel and the inner rotor magnetic steel are opposite one to one and have the same polarity.
Further, the thickness of the magnetic steel on the outer rotor yoke is smaller than that of the magnetic steel on the inner rotor yoke.
Further, an outer shaft of the bearing is fixed on the stator fixing seat, and an inner shaft of the bearing is connected with the rotor connecting disc.
Further, the inner edge length of the inner rotor magnetic steel along the circumferential direction is larger than the outer edge length.
Further, the inner side length of the outer rotor magnetic steel along the circumferential direction is smaller than the outer side length.
Further, the outer rotor magnetic steel surface-mounted fixes the inner side of the outer rotor yoke.
Further, the inner rotor magnetic steel surface-mounted fixes the outer side of the inner rotor yoke.
Further, the length ratio of the two magnetic steels with different lengths along the circumferential direction of the outer rotor magnetic steel group ranges from 1.5 to 1.3: 1.
Furthermore, the length ratio of the two magnetic steels with different lengths along the circumferential direction of the inner rotor magnetic steel group ranges from 1.5 to 1.1: 1.
Further, the outer stator includes: the outer stator slots are used for arranging electromagnetic coils, the outer stator teeth are used for fixing the electromagnetic coils, and the stator yoke is used for connecting the outer stator slots and the outer stator teeth;
the inner stator includes: the inner stator slot is used for arranging an electromagnetic coil, the inner stator teeth are used for fixing the electromagnetic coil, and the stator yoke is used for connecting the inner stator slot and the inner stator teeth;
the outer stator slots are opposite to the inner stator slots one by one and the number of the slots is equal; the outer stator teeth are opposite to the inner stator teeth one by one; the number of teeth is equal;
the heat dissipation portion includes: the plurality of cooling liquid channels are arranged between the plurality of inner stators and the outer stators, and thermosensitive fluid passes through the cooling liquid channels and is used for taking away heat generated by the stators.
Furthermore, the number of the inner stator slot and the outer stator slot is three times of the number of the inner rotor magnetic steel and the outer rotor magnetic steel.
Furthermore, a three-phase star-shaped outer winding is arranged in the outer stator slot, and a three-phase star-shaped inner winding is arranged in the inner stator slot.
Further, the inner and outer windings may be independently controlled, connected in series, or connected in parallel.
Further, the iron core of the outer stator and the iron core of the inner stator are of an integral structure.
Further, the iron core of the outer stator and the iron core of the inner stator are of a split structure.
The technical scheme of the invention ensures that the magnetic steel of the outer rotor in the double-rotor motor consists of magnetic steel groups with different radians, the magnetic steel of the inner rotor consists of magnetic steel groups with different radians, and the longer arc-shaped magnetic steel of the outer rotor is opposite to the shorter arc-shaped magnetic steel of the inner rotor; the shorter arc-shaped magnetic steel of the outer rotor is opposite to the longer arc-shaped magnetic steel of the inner rotor; the tooth space torque is further reduced, the torque pulsation is reduced while the high torque density is ensured, meanwhile, the heat dissipation device in the stator is beneficial to taking away the heat generated by the stator when the motor runs, and the power density of the motor is further improved.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
Fig. 1 is an exploded view of a dual rotor motor according to a preferred embodiment of the present invention;
fig. 2 is a perspective view of a dual rotor motor according to a preferred embodiment of the present invention;
fig. 3 is a stator assembly view of a double rotor motor according to a preferred embodiment of the present invention;
fig. 4 is a plan view of a stator core of a double-rotor motor according to a preferred embodiment of the present invention;
fig. 5 is a perspective view of a cooling pipe and a cooling liquid passage of a dual rotor motor according to a preferred embodiment of the present invention;
fig. 6 is a position view of outer rotor magnetic steel and inner rotor magnetic steel of a double-rotor motor according to a preferred embodiment of the present invention;
fig. 7 is a superimposed torque ripple diagram of the torque of the outer rotor and the torque of the inner rotor of the double rotor motor according to a preferred embodiment of the present invention.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components has been exaggerated in some places in the drawings where appropriate for clarity of illustration.
As shown in fig. 1, a preferred embodiment of the present invention is a permanent magnet dual rotor motor, comprising:
as shown in fig. 1, with the stator 4 between the outer and inner rotors; an outer air gap is arranged between the outer rotor and the stator 4; an inner air gap is arranged between the inner rotor and the stator 4; the outer rotor magnetic steel 6 is arranged on the outer rotor yoke 1, the inner rotor magnetic steel 7 is arranged on the inner rotor yoke 2, and the rotor connecting disc 3 fixes the outer rotor yoke 1 and the inner rotor yoke 2, so that the outer rotor yoke 1 and the inner rotor yoke 2 have a common axis, and the rotating speeds of the outer rotor yoke 1 and the inner rotor yoke 2 are the same; the stator core 8 is fixed to the stator fixing base 5, and a coolant passage for circulating a coolant is provided inside the stator fixing base 5 and connected to an external compressor through a connection pipe 17. The heat-sensitive fluid is used for the circulation of a cooling fluid through the cooling pipe 9, carrying away the heat generated by the stator 4. The stator 4 includes: the outer stator, the inner stator and the heat dissipation part; the outer stator and the inner stator of the outer rotor yoke 1 and the inner rotor yoke 2 are fixed on the stator fixing seat 5; the bearing 15 connects the stator fixing seat 5 and the rotor connecting disc 3. An outer shaft 11 of the bearing is fixed on the stator fixing seat, and an inner shaft 12 of the bearing is connected with the rotor connecting disc.
As shown in fig. 2, the outer rotor includes:
the outer rotor yoke is used for fixing the outer rotor magnetic steels 6 into N (N > =2) outer rotor magnetic steel groups which are uniformly distributed along the circumferential direction of the cylindrical outer rotor yoke, wherein the outer rotor magnetic steel groups are 2 outer rotor magnetic steels which are arranged along the circumferential direction and have different polarities, the polarities of any two adjacent outer rotor magnetic steels are different, the lengths of any two adjacent outer rotor magnetic steels are different along the circumferential direction, and gaps of any two adjacent outer rotor magnetic steels are the same;
an inner rotor, comprising:
the inner rotor yoke is used for fixing the inner rotor magnetic steel 7 into N (N > =2) inner rotor magnetic steel groups which are uniformly distributed along the circumferential direction of the cylindrical inner rotor yoke, wherein the inner rotor magnetic steel groups are 2 inner rotor magnetic steels which are arranged along the circumferential direction and have different polarities, the polarities of any two adjacent inner rotor magnetic steels are different, and the lengths of any two adjacent inner rotor magnetic steels are different along the circumferential direction; gaps between any two adjacent inner rotor magnetic steels are the same;
and the rotor connecting disc 3 is used for fixing the outer rotor yoke and the inner rotor yoke, so that the outer rotor yoke and the inner rotor yoke have a common axis, and the rotating speeds of the outer rotor yoke and the inner rotor yoke are the same.
As shown in fig. 3, the stator includes: the heat dissipation device comprises an outer stator, an inner stator, a heat dissipation part, a stator fixing seat and a bearing;
the outer stator and the inner stator are fixed on the stator fixing seat; the bearing is connected with the stator fixing seat and the rotor connecting disc.
As shown in fig. 4, the core of the outer stator and the core of the inner stator are of an integrated structure. The outer stator includes: the outer stator slots are used for arranging electromagnetic coils, the outer stator teeth are used for fixing the electromagnetic coils, and the stator yoke is used for connecting the outer stator slots and the outer stator teeth; the inner stator includes: the inner stator slot is used for arranging an electromagnetic coil, the inner stator teeth are used for fixing the electromagnetic coil, and the stator yoke is used for connecting the inner stator slot and the inner stator teeth; the outer stator grooves are opposite to the inner stator grooves one by one and the number of the grooves is equal; the outer stator teeth are opposite to the inner stator teeth one by one; and the number of teeth is equal;
the number of the inner stator slot and the outer stator slot is three times of the number of the inner rotor magnetic steel and the outer rotor magnetic steel.
And a three-phase star-shaped outer winding is arranged in the outer stator slot, and a three-phase star-shaped inner winding is arranged in the inner stator slot.
The inner and outer windings can be independently controlled, connected in series or connected in parallel.
Preferably, the core of the outer stator and the core of the inner stator are of a split structure.
As shown in fig. 5, the heat dissipation portion includes: a plurality of cooling fluid passages 10 are formed between the plurality of inner stators and the outer stator, and a heat sensitive fluid is arranged between the cooling fluid passages 10 through the cooling pipe 9 for circulation of the cooling fluid.
The cooling tube is the main component of stator fixing base 5 through epoxy glue fixed stator core for take away the heat that the stator produced. A cooling fluid channel 10 for circulating a cooling fluid is located inside the stator fixing base and is connected to an external compressor through a connection pipe.
As shown in fig. 6, the outer rotor magnetic steels 6 correspond to the inner rotor magnetic steels 7 one to one; the middle vertical plane of the longer magnetic steel on the outer rotor yoke is coplanar with the middle vertical plane of the shorter magnetic steel on the inner rotor yoke; the middle vertical plane of the shorter magnetic steel on the outer rotor yoke is coplanar with the middle vertical plane of the longer magnetic steel on the inner rotor yoke; the magnetic steel is magnetized in the radial direction, and the magnetic steel is of a fan-shaped, rectangular or trapezoidal cylindrical structure with the bottom surface. The outer rotor magnetic steel is arc-shaped magnetic steel along the circumferential direction. The outer rotor magnetic steel and the inner rotor magnetic steel are opposite one to one and have the same polarity. The thickness of the magnetic steel on the outer rotor yoke is smaller than that of the magnetic steel on the inner rotor yoke. The inner edge length of the inner rotor magnetic steel along the circumferential direction is larger than the outer edge length. The inner side length of the outer rotor magnetic steel along the circumferential direction is smaller than the outer side length. The outer rotor magnetic steel surface-mounted type fixes the inner side of the outer rotor yoke. The inner rotor magnetic steel surface-mounted type fixes the outer side of the inner rotor yoke. The length ratio of two magnetic steels with different lengths along the circumferential direction of the outer rotor magnetic steel group ranges from 1.5 to 1.3: 1. The length ratio of the two magnetic steels with different lengths along the circumferential direction of the inner rotor magnetic steel group ranges from 1.5 to 1.1: 1.
Another preferred embodiment of the present invention is a permanent magnet dual rotor motor including:
the 12 outer rotor magnetic steel groups are uniformly distributed along the circumferential direction of the cylindrical outer rotor yoke, wherein the outer rotor magnetic steel groups are 2 outer magnetic steels which are arranged along the circumferential direction and have different polarities, the polarities of any two adjacent outer magnetic steels are different, the lengths of any two adjacent outer magnetic steels are different along the circumferential direction, and gaps between any two adjacent outer magnetic steels are the same; the magnetic steels with different lengths are alternately arranged, so that the tooth space torque is reduced;
the 12 inner rotor magnetic steel groups are uniformly distributed along the circumferential direction of the cylindrical inner rotor yoke, wherein the outer rotor magnetic steel groups are provided with 2 inner magnetic steels which are arranged along the circumferential direction and have different polarities, the polarities of any two adjacent inner magnetic steels are different, and the lengths of any two adjacent inner magnetic steels are different along the circumferential direction; gaps between any two adjacent inner magnetic steels are the same; the magnetic steels with different lengths are alternately arranged, so that the tooth space torque is reduced;
the rotor connecting disc is used for fixing the outer rotor yoke and the inner rotor yoke, so that the outer rotor yoke and the inner rotor yoke have a common axis, and the rotating speeds of the outer rotor yoke and the inner rotor yoke are the same; the torque provided by the outer rotor and the inner rotor is superposed to further reduce the tooth socket torque; as shown in fig. 7, torque ripple reduction is clearly seen in torque 201 provided by the outer rotor, torque 202 provided by the inner rotor, and superimposed torque 203. As shown in fig. 7: torque 201 provided by the outer rotor, torque 202 provided by the inner rotor, and superimposed torque 203, a reduction in torque ripple is evident. The torque ripple values obtained by the software simulation were as follows:
torque pulsation Maximum value Mean value of Minimum value
Instantaneous total torque 62.9267 62.0582 61.2032
The outer rotor providing instant torque 27.1005 22.6052 17.9061
Inner rotor providing instant torque 43.897 39.4529 34.2016
As shown in fig. 1, an outer rotor magnetic steel 6 is arranged on an outer rotor yoke 1, an inner rotor magnetic steel 7 is arranged on an inner rotor yoke 2, and a rotor connecting disc 3 fixes the outer rotor yoke 1 and the inner rotor yoke 2, so that the outer rotor yoke 1 and the inner rotor yoke 2 have a common axis, and the rotating speeds of the outer rotor yoke 1 and the inner rotor yoke 2 are the same; wherein the stator 4 is between the outer rotor and the inner rotor; an outer air gap is arranged between the outer rotor and the stator 4; an inner air gap is arranged between the inner rotor and the stator 4; the stator core 8 is fixed to the stator fixing base 5, and a coolant passage for circulating a coolant is provided inside the stator fixing base 5 and connected to an external compressor through a connection pipe 17. The heat-sensitive fluid is used for the circulation of a cooling fluid through the cooling pipe 9, carrying away the heat generated by the stator 4. The stator 4 includes: the outer stator, the inner stator and the heat dissipation part; the outer stator and the inner stator of the outer rotor yoke 1 and the inner rotor yoke 2 are fixed on the stator fixing seat 5; the bearing 15 connects the stator fixing seat 5 and the rotor connecting disc 3. An outer shaft 11 of the bearing is fixed on the stator fixing seat, and an inner shaft 12 of the bearing is connected with the rotor connecting disc.
As shown in fig. 2, the outer rotor includes:
the outer rotor yoke is used for fixing the outer rotor magnetic steels into 12 outer rotor magnetic steel groups, and 24 outer rotor magnetic steels are uniformly distributed along the circumferential direction of the cylindrical outer rotor yoke, wherein the outer rotor magnetic steel groups are 2 outer rotor magnetic steels which are arranged along the circumferential direction and have different polarities;
an inner rotor, comprising:
the inner rotor yoke is used for fixing the inner rotor magnetic steels and is provided with 12 inner rotor magnetic steel groups, 24 inner rotor magnetic steels are uniformly distributed along the circumferential direction of the cylindrical inner rotor yoke, the inner rotor magnetic steel groups are provided with 2 inner rotor magnetic steels which are arranged along the circumferential direction and have different polarities, the polarities of any two adjacent inner rotor magnetic steels are different, and the lengths of any two adjacent inner rotor magnetic steels are different along the circumferential direction; gaps between any two adjacent inner rotor magnetic steels are the same;
and the rotor connecting disc is used for fixing the outer rotor yoke and the inner rotor yoke, so that the outer rotor yoke and the inner rotor yoke have a common axis, and the rotating speeds of the outer rotor yoke and the inner rotor yoke are the same. The end parts of the outer rotor yoke and the inner rotor yoke are used for being fixed with the rotor connecting disc.
As shown in fig. 3, the stator includes: the outer stator, the inner stator and the heat dissipation part;
the outer stator and the inner stator are fixed on the stator fixing seat; the bearing is connected with the stator fixing seat and the rotor connecting disc.
As shown in fig. 4, the core of the outer stator and the core of the inner stator are of an integrated structure. The outer stator includes: the outer stator slots are used for arranging electromagnetic coils, the outer stator teeth are used for fixing the electromagnetic coils, and the stator yoke is used for connecting the outer stator slots and the outer stator teeth; the inner stator includes: the inner stator slot is used for arranging an electromagnetic coil, the inner stator teeth are used for fixing the electromagnetic coil, and the stator yoke is used for connecting the inner stator slot and the inner stator teeth; the outer stator grooves are opposite to the inner stator grooves one by one and the number of the grooves is equal; the outer stator teeth are opposite to the inner stator teeth one by one; and the number of teeth is equal;
the number of inner and outer stator slots is 72.
And a three-phase star-shaped outer winding is arranged in the outer stator slot, and a three-phase star-shaped inner winding is arranged in the inner stator slot.
The inner and outer windings can be independently controlled, connected in series or connected in parallel.
Preferably, the core of the outer stator and the core of the inner stator are of a split structure.
As shown in fig. 5, the heat dissipation portion includes: a plurality of cooling fluid passages 10 are formed between the plurality of inner stators and the outer stator, and a heat sensitive fluid is arranged between the cooling fluid passages 10 through the cooling pipe 9 for circulation of the cooling fluid.
The cooling tube is the essential element of stator fixing base through epoxy glue fixed stator core for take away the heat that the stator produced. The cooling liquid channel for circulating cooling liquid is positioned in the stator fixing seat and is connected to an external compressor through a connecting pipe.
As shown in fig. 6, the outer rotor magnetic steels 6 correspond to the inner rotor magnetic steels 7 one to one; the middle vertical plane of the longer magnetic steel on the outer rotor yoke is coplanar with the middle vertical plane of the shorter magnetic steel on the inner rotor yoke; the middle vertical plane of the shorter magnetic steel on the outer rotor yoke is coplanar with the middle vertical plane of the longer magnetic steel on the inner rotor yoke; the magnetic steel is magnetized in the radial direction, and the magnetic steel is of a fan-shaped, rectangular or trapezoidal cylindrical structure with the bottom surface. The outer rotor magnetic steel is arc-shaped magnetic steel along the circumferential direction. The outer rotor magnetic steel and the inner rotor magnetic steel are opposite one to one and have the same polarity. The thickness of the magnetic steel on the outer rotor yoke is smaller than that of the magnetic steel on the inner rotor yoke. The inner edge length of the inner rotor magnetic steel along the circumferential direction is larger than the outer edge length. The inner side length of the outer rotor magnetic steel along the circumferential direction is smaller than the outer side length. The outer rotor magnetic steel surface-mounted type fixes the inner side of the outer rotor yoke. The inner rotor magnetic steel surface-mounted type fixes the outer side of the inner rotor yoke. The length ratio of two magnetic steels with different lengths along the circumferential direction of the outer rotor magnetic steel group ranges from 1.5 to 1.3: 1. The length ratio of the two magnetic steels with different lengths along the circumferential direction of the inner rotor magnetic steel group ranges from 1.5 to 1.1: 1.
The technical scheme of the invention ensures that the magnetic steel of the outer rotor in the double-rotor motor consists of magnetic steel groups with different radians, the magnetic steel of the inner rotor consists of magnetic steel groups with different radians, and the longer arc-shaped magnetic steel of the outer rotor is opposite to the shorter arc-shaped magnetic steel of the inner rotor; the shorter arc-shaped magnetic steel of the outer rotor is opposite to the longer arc-shaped magnetic steel of the inner rotor; the tooth space torque is further reduced, the torque pulsation is reduced while the high torque density is ensured, meanwhile, the heat dissipation device in the stator is beneficial to taking away the heat generated by the stator when the motor runs, and the power density of the motor is further improved.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims (18)

1. A permanent magnet dual rotor motor, comprising:
the rotor comprises an outer rotor, a stator, an inner rotor and a rotor connecting disc; wherein the stator is between the outer rotor and the inner rotor; external rotor
An outer air gap is arranged between the stator and the stator; an inner air gap is arranged between the inner rotor and the stator;
the outer rotor includes:
the outer rotor yoke is used for fixing the outer rotor magnetic steel;
n (N > =2) outer rotor magnetic steel groups which are arranged to be uniformly distributed along the circumferential direction of the cylindrical outer rotor yoke, wherein the outer rotor magnetic steel groups are 2 outer rotor magnetic steels which are arranged along the circumferential direction and have different polarities, the polarities of any two adjacent outer rotor magnetic steels are different, the lengths of any two adjacent outer rotor magnetic steels are different along the circumferential direction, and gaps between any two adjacent outer rotor magnetic steels are the same;
the inner rotor includes:
the inner rotor yoke is used for fixing the inner rotor magnetic steel;
n (N > =2) inner rotor magnetic steel groups which are uniformly distributed along the circumferential direction of the cylindrical inner rotor yoke, wherein the inner rotor magnetic steel groups are 2 inner rotor magnetic steels which are arranged along the circumferential direction and have different polarities, the polarities of any two adjacent inner rotor magnetic steels are different, and the lengths of any two adjacent inner rotor magnetic steels are different along the circumferential direction; gaps between any two adjacent inner rotor magnetic steels are the same;
the rotor connecting disc is used for fixing the outer rotor yoke and the inner rotor yoke, so that the outer rotor yoke and the inner rotor yoke have a common axis, and the rotating speeds of the outer rotor yoke and the inner rotor yoke are the same;
the outer rotor magnetic steel and the inner rotor magnetic steel correspond to each other one by one; the middle vertical plane of the longer magnetic steel on the outer rotor yoke is coplanar with the middle vertical plane of the shorter magnetic steel on the inner rotor yoke; the middle vertical plane of the shorter magnetic steel on the outer rotor yoke is coplanar with the middle vertical plane of the longer magnetic steel on the inner rotor yoke;
the stator includes: the heat dissipation device comprises an outer stator, an inner stator, a heat dissipation part, a stator fixing seat and a bearing;
the outer stator and the inner stator are fixed on the stator fixing seat; the bearing is connected with the stator fixing seat and the rotor connecting disc.
2. The motor of claim 1, wherein the magnetic steel is radially magnetized, and the magnetic steel is in a fan-shaped, rectangular or trapezoidal cylindrical structure with a bottom surface.
3. The motor of claim 1, wherein the outer rotor magnetic steel is an arc-shaped magnetic steel along the circumferential direction.
4. The motor of claim 1, wherein the outer rotor magnetic steel and the inner rotor magnetic steel are opposite one to another and have the same polarity.
5. The electric motor of claim 1, wherein the thickness of the magnetic steel on the outer rotor yoke is less than the thickness of the magnetic steel on the inner rotor yoke.
6. The motor of claim 1, wherein the outer shaft of the bearing is fixed to the stator holder and the inner shaft of the bearing is connected to the rotor land.
7. The motor of claim 1, wherein the inner rotor magnetic steel has an inner side length in a circumferential direction greater than an outer side length.
8. The motor of claim 1, wherein the inner side length of the outer rotor magnetic steel in the circumferential direction is smaller than the outer side length.
9. The electric machine of claim 1, wherein the outer rotor magnetic steel surface-mounts an inner side of the outer rotor yoke.
10. The electric motor of claim 1, wherein the inner rotor magnetic steel is surface mounted to an outer side of the inner rotor yoke.
11. The motor of claim 1, wherein the length ratio of the two magnetic steels of the outer rotor magnetic steel set with different lengths along the circumferential direction ranges from 1.5 to 1.3: 1.
12. The motor of claim 1, wherein the length ratio of two magnetic steels of the inner rotor magnetic steel group with different lengths along the circumferential direction ranges from 1.5 to 1.1: 1.
13. The electrical machine of claim 1,
the outer stator includes: the outer stator slots are used for arranging electromagnetic coils, the outer stator teeth are used for fixing the electromagnetic coils, and the stator yoke is used for connecting the outer stator slots and the outer stator teeth;
the inner stator includes: the inner stator slot is used for arranging an electromagnetic coil, the inner stator teeth are used for fixing the electromagnetic coil, and the stator yoke is used for connecting the inner stator slot and the inner stator teeth;
the outer stator slots are opposite to the inner stator slots one by one and the number of the slots is equal; the outer stator teeth are opposite to the inner stator teeth one by one; the number of teeth is equal;
the heat dissipation portion includes: the plurality of cooling liquid channels are arranged between the plurality of inner stators and the outer stators, and thermosensitive fluid passes through the cooling liquid channels and is used for taking away heat generated by the stators.
14. The electric motor of claim 13, wherein the number of inner and outer stator slots is three times the number of inner and outer rotor magnetic steels.
15. An electrical machine according to any of claims 13 or 14, wherein a three phase star outer winding is provided in the outer stator slots and a three phase star inner winding is provided in the inner stator slots.
16. The machine of claim 15 wherein the inner and outer windings are independently controllable, in series, or in parallel.
17. The motor of claim 13, wherein the core of the outer stator and the core of the inner stator are of a unitary structure.
18. The motor of claim 13, wherein the core of the outer stator and the core of the inner stator are of a separate structure.
CN202111345813.0A 2021-03-19 2021-11-15 Permanent magnet double-rotor motor Pending CN114499089A (en)

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Application Number Priority Date Filing Date Title
CN202110297565.0A CN112994390A (en) 2021-03-19 2021-03-19 Birotor radial permanent magnet motor
CN2021102975650 2021-03-19

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CN202110297565.0A Pending CN112994390A (en) 2021-03-19 2021-03-19 Birotor radial permanent magnet motor
CN202122787429.8U Active CN216751487U (en) 2021-03-19 2021-11-15 Double-rotor structure of permanent magnet motor
CN202111345853.5A Pending CN113890295A (en) 2021-03-19 2021-11-15 Magnetic steel array of permanent magnet double-rotor motor
CN202111345718.0A Pending CN114337164A (en) 2021-03-19 2021-11-15 Method for reducing torque pulsation of permanent magnet double-rotor motor
CN202111345719.5A Pending CN114337165A (en) 2021-03-19 2021-11-15 Manufacturing method of motor double rotors
CN202122783637.0U Active CN216751486U (en) 2021-03-19 2021-11-15 Magnetic steel array of permanent magnet double-rotor motor
CN202111345845.0A Pending CN114337167A (en) 2021-03-19 2021-11-15 Double-rotor structure of permanent magnet motor
CN202111345814.5A Pending CN114337166A (en) 2021-03-19 2021-11-15 Magnetic steel setting method of permanent magnet double-rotor motor
CN202111345813.0A Pending CN114499089A (en) 2021-03-19 2021-11-15 Permanent magnet double-rotor motor
CN202122783591.2U Active CN216751485U (en) 2021-03-19 2021-11-15 Permanent magnet double-rotor motor
CN202210278400.3A Pending CN114884295A (en) 2021-03-19 2022-03-21 Double-rotor motor stator

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CN202110297565.0A Pending CN112994390A (en) 2021-03-19 2021-03-19 Birotor radial permanent magnet motor
CN202122787429.8U Active CN216751487U (en) 2021-03-19 2021-11-15 Double-rotor structure of permanent magnet motor
CN202111345853.5A Pending CN113890295A (en) 2021-03-19 2021-11-15 Magnetic steel array of permanent magnet double-rotor motor
CN202111345718.0A Pending CN114337164A (en) 2021-03-19 2021-11-15 Method for reducing torque pulsation of permanent magnet double-rotor motor
CN202111345719.5A Pending CN114337165A (en) 2021-03-19 2021-11-15 Manufacturing method of motor double rotors
CN202122783637.0U Active CN216751486U (en) 2021-03-19 2021-11-15 Magnetic steel array of permanent magnet double-rotor motor
CN202111345845.0A Pending CN114337167A (en) 2021-03-19 2021-11-15 Double-rotor structure of permanent magnet motor
CN202111345814.5A Pending CN114337166A (en) 2021-03-19 2021-11-15 Magnetic steel setting method of permanent magnet double-rotor motor

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CN202210278400.3A Pending CN114884295A (en) 2021-03-19 2022-03-21 Double-rotor motor stator

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CN116526722B (en) * 2023-03-10 2023-12-19 广东白云学院 Axial magnetic flux magnetic-yoke-free hub motor with ceramic air cooling structure
CN117748872B (en) * 2024-02-21 2024-04-19 清华大学 Radial double-rotor motor
CN118040928B (en) * 2024-04-12 2024-06-21 山西观复智能科技有限公司 Double-permanent magnet synchronous excitation motor for unmanned aerial vehicle

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CN216751485U (en) 2022-06-14
CN114884295A (en) 2022-08-09
CN113890295A (en) 2022-01-04
CN114337164A (en) 2022-04-12
CN114337165A (en) 2022-04-12
CN112994390A (en) 2021-06-18
CN114337166A (en) 2022-04-12
CN216751486U (en) 2022-06-14
CN114337167A (en) 2022-04-12

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