High-power-density winding isolation type double-source motor device

Abstract

The invention discloses a high-power-density winding isolation type double-source motor device, and belongs to the technical field of power generation, power transformation or power distribution. The device comprises a rotor assembly and a stator assembly assembled with the rotor assembly, wherein the stator assembly comprises a stator iron core, a set of concentrated winding serving as a high-voltage winding and a set of concentrated winding serving as a low-voltage winding; the stator core is provided with high-voltage stator teeth and low-voltage stator teeth which are alternately distributed along the circumference, the width of the high-voltage stator teeth is larger than that of the low-voltage stator teeth, the high-voltage winding and the low-voltage winding are wound on the stator teeth in a layered mode, and the high-voltage winding and the low-voltage winding output torque through a rotating shaft alternatively. The high-voltage winding and the low-voltage winding have the characteristics of electrical isolation, magnetic isolation and thermal isolation in space. The winding isolation type double-source motor provided by the invention can provide redundancy design when a high-voltage power source fails, is high in operation reliability, has the advantages of high power density and low cost, and is low in installation space requirement.

Description

Technical Field

[0001] The present invention relates to the technology of electric vehicle motors, and in particular discloses a high-power density winding isolated dual-source motor device, belonging to the technical field of power generation, power transformation or power distribution. Background Art

[0002] A dual-source motor is a motor that uses dual-power supply technology. Its core lies in supplying power to two sets of windings in the motor through two different types or voltage levels of power supplies respectively. The two sets of windings alternatively output torque through the rotating shaft to provide a redundant design when one power source fails. This technology can significantly improve the performance, reliability and economy of the motor.

[0003] In order to enable the dual-source motor to provide a redundant power source when one power source fails, the following two improved dual-source motors are proposed in the prior art, but both have some defects.

[0004] The first improved dual-source motor uses two stators and two sets of windings. The two stators are coaxially installed and share a rotor. The motor structure was first proposed by Italian scholar Nicola Bianchi in the article "Design of a Fault-Tolerant IPM Motor for Electric Power Steering" published in the IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY journal in 2006. Although this structure realizes the electrical isolation, magnetic isolation and thermal isolation of the two sets of windings, the biggest drawback is that it increases the axial dimension of the motor, wastes the installation space, and thus the power density of the motor is severely limited.

[0005] The second improved dual-source motor adopts a distributed winding scheme, and the high-voltage and low-voltage windings are wound on the same stator tooth at the same time, separated by insulating paper in the middle, and the end windings are still crossed together. There is serious magnetic coupling and thermal coupling between the two sets of windings, and effective thermal isolation and magnetic isolation are not achieved. When a short-circuit fault occurs in one set of windings, it affects the health of the other set of windings, and ultimately reduces the reliability of the motor.

[0006] In summary, the present invention aims to propose a high-power density winding isolated dual-source motor to overcome the defects of the existing dual-source motor in terms of limited power density under dual-source power supply and reduced operating reliability. Summary of the Invention

[0007] The object of the present invention is to overcome the deficiencies of the prior art and provide a high-power-density winding-isolated dual-source motor device. On the one hand, the object of the invention is to meet the application requirements of high operating reliability, high power density, low cost, and small installation space requirements of the dual-source motor. On the other hand, the object of the invention is to overcome the electrical coupling, magnetic coupling, and thermal coupling between the two sets of windings, further improve the reliability in harsh working environments such as faults, and solve the technical problems of large power volume density, large power mass density, high cost, complex processing technology, and low operating reliability of the existing dual-source motor.

[0008] The present invention adopts the following technical solutions to achieve the above object: A high-power-density winding-isolated dual-source motor device, including a rotor assembly and a stator assembly assembled therewith. The stator assembly includes: a stator core, a set of concentrated windings as the high-voltage winding, and a set of concentrated windings as the low-voltage winding. The stator core has high-voltage stator teeth and low-voltage stator teeth that are alternately distributed along the circumference. The width of the high-voltage stator teeth is greater than the width of the low-voltage stator teeth. The high-voltage winding and the low-voltage winding are wound on the stator teeth in layers.

[0009] As a further optimized scheme of the high-power-density winding-isolated dual-source motor device, the high-voltage winding and the low-voltage winding are wound on the stator teeth in layers, specifically: the high-voltage winding and the low-voltage winding are respectively wound on the high-voltage stator teeth and the low-voltage stator teeth, and the high-voltage winding and the low-voltage winding are alternately arranged on the same circumference.

[0010] As a further optimized scheme of the high-power-density winding-isolated dual-source motor device, the high-voltage winding and the low-voltage winding are wound on the stator teeth in layers, specifically: the high-voltage winding and the low-voltage winding are respectively wound on the high-voltage stator teeth and the low-voltage stator teeth, and the high-voltage winding is arranged on the same circumference, the low-voltage winding is arranged on the same circumference, and the circumference on which the low-voltage winding is arranged is located inside the circumference on which the high-voltage winding is arranged; or, the high-voltage winding is wound on each stator tooth, the low-voltage winding is wound on each stator tooth, and the circumference on which the low-voltage winding is arranged is located inside the circumference on which the high-voltage winding is arranged.

[0011] As a further optimized scheme of the high-power-density winding-isolated dual-source motor device, in the stator assembly, a winding dividing tooth structure is further formed in the winding slot between adjacent high-voltage stator teeth and low-voltage stator teeth. The winding dividing tooth structure has winding dividing tooth insulation, and the winding dividing tooth insulation includes but is not limited to air, insulating paper, insulating skeleton, epoxy resin, and slot wedges.

[0012] As a further optimized scheme of the high-power-density winding-isolated dual-source motor device, in the stator assembly, grooves or bosses for fixing the winding dividing tooth structure are provided on adjacent high-voltage stator teeth and low-voltage stator teeth.

[0013] As a further optimization solution for the high-power density winding isolated dual-source motor device, slot insulation is provided on the high-voltage stator teeth and the low-voltage stator teeth. The slot insulation includes but is not limited to: slot insulation paper, insulation coating, and insulation bracket.

[0014] As a further optimization solution for the high-power density winding isolated dual-source motor device, both the high-voltage winding and the low-voltage winding adopt flat copper wire conductor forms; or, the high-voltage winding adopts a flat copper wire conductor form and the low-voltage winding adopts a round copper wire conductor form; or, the high-voltage winding adopts a round copper wire winding form and the low-voltage winding adopts a flat copper wire conductor form.

[0015] As a further optimization solution for the high-power density winding isolated dual-source motor device, the number Q of stator teeth in the stator assembly and the number P of rotor poles in the rotor assembly satisfy Q = P ± 2 or Q = P ± 4, where Q and P are positive integers respectively.

[0016] As a further optimization solution for the high-power density winding isolated dual-source motor device, the rotor assembly includes: a rotor core, a permanent magnet, a rotor pressing plate, a bearing, and a rotating shaft. Among them, the rotor core is circumferentially and equidistantly provided with at least one permanent magnet slot and a magnetic isolation slot. The permanent magnet is assembled in the permanent magnet slot. After the permanent magnet is assembled, the rotor core is assembled on the rotating shaft. The rotor pressing plate and the bearing are sequentially assembled at the front end of the rotor core in the axial direction. The shape of the permanent magnet slot can include but is not limited to: V-shaped, double-V-shaped, multi-layer V-shaped, Spoke-shaped, double-layer Spoke-shaped, multi-layer Spoke-shaped, arc-shaped, double-layer arc-shaped, multi-layer arc-shaped, one-shaped, double-layer one-shaped, multi-layer one-shaped, U-shaped, double-layer U-shaped, multi-layer U-shaped, and special-shaped structures.

[0017] The present invention adopts the above technical solutions and has the following beneficial effects: (1) By improving the structure of the dual-source motor sharing a rotor, the present invention reasonably arranges and installs two sets of concentrated windings on the stator teeth. The wider high-voltage teeth carry higher magnetic flux density and current load, and the narrower low-voltage teeth optimize space utilization, shorten the end length, reduce copper loss and thermal coupling. It can not only achieve the goals of high operating reliability, high power density, low cost, and small installation space requirements of the dual-source motor, but also overcome the electrical coupling, magnetic coupling, and thermal coupling between the two sets of windings, and improve the reliability of the dual-source motor under extreme environments and faults and other harsh working conditions.

[0018] (2) The dual-source motor proposed by the present invention makes full use of the advantages of the concentrated winding structure, which is compact, has mature technology and low cost. By optimizing the arrangement method of the concentrated winding, the isolation winding of the high-voltage winding and the low-voltage winding is realized within the limited space of the stator assembly, and the width of the stator teeth can be flexibly adjusted according to actual application requirements, so as to balance the general and customized requirements. Description of the Drawings

[0019] Figure 1 Explosion diagram of the overall structure of the dual-source motor proposed by the present invention.

[0020] Figure 2 Cross-sectional view of the stator and rotor of the dual-source motor proposed by the present invention.

[0021] Figure 3 Cross-sectional view of the stator and winding of the dual-source motor proposed by the present invention.

[0022] Figure 4 Schematic diagram of the first high-low voltage winding winding method exemplified in the embodiment of the present invention.

[0023] Figure 5 Schematic diagram of the second high-low voltage winding winding method exemplified in the embodiment of the present invention.

[0024] Figure 6 Schematic diagram of the third high-low voltage winding winding method exemplified in the embodiment of the present invention.

[0025] Figure 7 Cross-sectional view of the stator core of a high-low voltage winding separation method exemplified in the embodiment of the present invention.

[0026] Figure 8 For Figures 4 to 6 Schematic diagram of a further optimized method of the third high-low voltage winding winding method exemplified.

[0027] Figure 9 For Figures 4 to 6 Schematic diagram of a further optimized method of the third high-low voltage winding winding method exemplified.

[0028] Figure 10 For Figures 4 to 6 Schematic diagram of a further optimized method of the third high-low voltage winding winding method exemplified.

[0029] Figure 11 Structural diagram of the first high-low voltage stator core punching sheet exemplified in the embodiment of the present invention.

[0030] Figure 12 Structural diagram of the second high-low voltage stator core punching sheet exemplified in the embodiment of the present invention.

[0031] Figure 13 Simulation results of the output torque of the unequal tooth width dual-source motor and the equal tooth width dual-source motor in the embodiment of the present invention.

[0032] Figure 14 Schematic diagram of the comparison results of the axial dimensions, volume, weight, and power density between the dual-source motor structure proposed by the present invention and the traditional dual-source motor.

[0033] Description of reference numerals in the figures: 1. Housing, 2. Front end cover, 3. Rear end cover, 4. Stator core, 4-1. Stator yoke, 4-2. High-voltage stator teeth, 4-3. Low-voltage stator teeth, 4-4. Tooth boot, 4-5. Slot insulation, 4-6. Winding segmentation teeth, 4-7. Winding segmentation teeth insulation, 5. Low-voltage winding, 6. High-voltage winding, 7. Rotor core, 8. Permanent magnet, 9. Rotor clamping plate, 10. Bearing, 11. Shaft, 12. Rotor magnetic isolation slot, 13. Permanent magnet slot. Detailed implementation manner

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0035] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0036] The three-dimensional structure explosion diagram and two-dimensional cross-sectional diagram of the power density winding isolation type dual-source motor device improved by the present invention are as shown in Figure 1 and Figure 2 The main structure includes: housing 1, front end cover 2, rear end cover 3, stator assembly and rotor assembly. The stator assembly includes a set of concentrated windings as high-voltage windings and a set of concentrated windings as low-voltage windings. After the rotor assembly is inserted into the stator assembly, it is coaxially installed. The housing 1 is sleeved outside the assembled stator and rotor assemblies. The front end cover 1 and the rear end cover 3 are respectively placed at the front and rear ends of the housing 1 and then assembled with the rotor assembly. The rotor assembly can be a permanent magnet rotor; the stator-rotor structure can be an outer stator and inner rotor structure or an inner stator and outer rotor structure; the dual-source motor can also be an asynchronous motor, a switched reluctance motor, a wound synchronous motor and other structures.

[0037] As shown in Figure 1 , Figure 2 The rotor assembly includes: rotor core 7, permanent magnet 8, rotor clamping plate 9, bearing 10 and shaft 11. Among them, the rotor core 7 is circumferentially and equidistantly provided with a number of permanent magnet slots 13 and magnetic isolation slots 12. The permanent magnet 8 is assembled in the permanent magnet slot 13. After the permanent magnet 8 is assembled, the rotor core 7 is assembled on the shaft 11. The rotor clamping plate 9 and the bearing 10 are sequentially assembled at the front end of the rotor core 7 in the axial direction. The shape of the permanent magnet slot can adopt V-shaped, double V-shaped, multi-layer V-shaped, Spoke-shaped, double-layer Spoke-shaped, multi-layer Spoke-shaped, arc-shaped, double-layer arc-shaped, multi-layer arc-shaped, one-shaped, double-layer one-shaped, multi-layer one-shaped, U-shaped, double-layer U-shaped, multi-layer U-shaped and other special-shaped structures.

[0038] As shown in Figure 1 and Figure 2 , the stator assembly includes: a stator core 4, a low-voltage winding 5, and a high-voltage winding 6. The stator core 4 is composed of a plurality of stator teeth and a stator yoke 4-1. Adjacent stator teeth adopt a non-uniform width structure. Any two adjacent stator teeth are a high-voltage stator tooth 4-2 and a low-voltage stator tooth 4-3. The high-voltage stator teeth 4-2 and the low-voltage stator teeth 4-3 are arranged alternately. The high-voltage winding 6 and the low-voltage winding 5 are evenly wound on the high-voltage stator teeth 4-2 and the low-voltage stator teeth 4-3 respectively. The high- and low-voltage windings achieve magnetic isolation and thermal isolation in space. Torque is output through the rotating shaft 11 by either the high-voltage winding or the low-voltage winding.

[0039] In one embodiment of the present invention, the stator assembly adopts a 24-slot scheme, with a total of 24 teeth in the circumferential direction. Among them, there are 12 high-voltage teeth and 12 low-voltage teeth; the rotor assembly adopts a 22-pole scheme, with 22 permanent magnet slots and several magnetic isolation slots inside. The permanent magnets adopt a tangential magnetization method, and the magnetization directions of adjacent permanent magnets are opposite. The number Q of stator teeth and the number P of rotor poles satisfy Q = P ± 2 or Q = P ± 4, where Q and P are positive integers respectively. The slot-pole combinations of the stator and rotor can select combinations such as 12 slots 10 poles, 12 slots 8 poles, 18 slots 16 poles, 24 slots 20 poles, and 24 slots 22 poles.

[0040] Figure 3 is the cross-sectional view of the stator and windings of the dual-source motor proposed in the present invention. Among them, due to the different numbers of turns of the high- and low-voltage windings, the number of cross-sectional conductors is also different. The high- and low-voltage windings are respectively wound on the high- and low-voltage stator teeth. The high-voltage stator teeth adopt a pole shoe scheme, and the low-voltage stator teeth adopt a straight tooth without pole shoe scheme. The pole shoe schemes can also be arbitrarily combined according to different processes. The widths of the high- and low-voltage stator teeth are different. The wider stator teeth are selected as the high-voltage stator teeth, and the narrower stator teeth are selected as the low-voltage stator teeth. The widths of the high- and low-voltage stator teeth can be adjusted according to the matching of the high- and low-voltage powers and the level of the working magnetic density. There is no limit to the widths of the high-voltage stator teeth and the low-voltage stator teeth. Optionally, slot insulation 4-5 is provided on the high- and low-voltage stator teeth, specifically by wrapping slot insulation paper on the high- and low-voltage stator teeth, or coating with an insulating coating, or sleeving an insulating bracket, and then winding the high- and low-voltage windings on the high- and low-voltage stator teeth respectively.

[0041] In one embodiment of the present invention, the first winding method of the high- and low-voltage windings as shown in Figure 4 is provided, where the high- and low-voltage windings are respectively wound on the high- and low-voltage stator teeth, and the high- and low-voltage windings are arranged alternately on the same circumference.

[0042] In one embodiment of the present invention, the one as shown in Figure 5The second high- and low-voltage winding winding method shown has the high- and low-voltage windings respectively wound on the high- and low-voltage stator teeth, and the high-voltage windings are arranged on the same circumference, and the low-voltage windings are arranged on the same circumference. The circumference where the low-voltage windings are arranged is located inside the circumference where the high-voltage windings are arranged.

[0043] In an embodiment of the present invention, there is provided as Figure 6 shown in the third high- and low-voltage winding winding method, the high-voltage winding is wound on each stator tooth, the low-voltage winding is wound on each stator tooth, and the circumference where the low-voltage windings are arranged is located inside the circumference where the high-voltage windings are arranged.

[0044] In an embodiment of the present invention, for Figure 4 the first high- and low-voltage winding winding method shown, there is provided as Figure 7 shown in the stator core with a high- and low-voltage winding separation method. Here, a combination of a winding separation tooth 4-6 and a winding separation tooth insulation 4-7 is used to achieve the isolation of the high- and low-voltage windings in the stator slot. The winding separation tooth 4-6 is reserved during the stamping of the stator core punching sheet, and the winding separation tooth insulation 4-7 for isolating the high- and low-voltage windings is provided on the winding separation tooth 4-6. In addition, air, insulating paper, insulating skeleton, epoxy resin or slot wedge can be used to separate the high- and low-voltage windings to achieve electrical isolation, electromagnetic isolation and thermal isolation.

[0045] In an embodiment of the present invention, on the basis of the second and third high- and low-voltage winding winding methods provided as Figure 5 、 Figure 6 shown, the windings are further optimized. As Figure 8 shown, both the high-voltage winding and the low-voltage winding adopt the form of flat copper wire conductors, further improving the electrical isolation ability. This optimization method is also applicable to other high- and low-voltage winding winding methods including the first high- and low-voltage winding winding method shown as Figure 4 shown.

[0046] In an embodiment of the present invention, on the basis of the second and third high- and low-voltage winding winding methods provided as Figure 5 、 Figure 6 shown, the windings are further optimized. As Figure 9 shown, the high-voltage winding adopts the form of a flat copper wire winding, and the low-voltage winding adopts the form of a conventional round copper wire conductor, further improving the electrical isolation ability. This optimization method is also applicable to other high- and low-voltage winding winding methods including the first high- and low-voltage winding winding method shown as Figure 4 shown.

[0047] In an embodiment of the present invention, on the basis of the second and third high- and low-voltage winding winding methods provided as Figure 5 、 Figure 6 shown, the windings are further optimized. As Figure 10As shown, the high-voltage winding adopts the form of a conventional round copper wire winding, and the low-voltage winding adopts the form of a flat copper wire conductor, further enhancing the electrical isolation ability. This optimization method is also applicable to other high-low voltage winding winding methods including the first high-low voltage winding winding method as shown in Figure 4 shown.

[0048] In an embodiment of the present invention, there is provided a first high-low voltage stator core punching structure as shown in Figure 11 shown, wherein grooves are provided on both the high and low stator teeth, and the grooves are used to fix the high-low voltage winding slot-internal partition insulation structure. This optimization method is applicable to Figure 5 , Figure 6 shown second and third high-low voltage winding winding methods.

[0049] In an embodiment of the present invention, there is provided a second high-low voltage stator core punching structure as shown in Figure 12 shown, wherein bosses are provided on both the high and low stator teeth, and the bosses are used to fix the high-low voltage winding slot-internal partition insulation structure. After the concentrated windings are arranged in the above manner, they are laminated and crossed in both the straight section and the end bending area in the slot, and have spatial electrical, magnetic, and thermal isolation capabilities. This optimization method is applicable to Figure 5 , Figure 6 shown second and third high-low voltage winding winding methods.

[0050] The high and low voltage windings of the dual-source motor are respectively connected to the high-voltage controller and the low-voltage controller. The high-voltage controller controls the high-voltage power supply to supply power to the motor, and the low-voltage controller controls the low-voltage power supply to supply power to the motor after the high-voltage battery fails. The motor can be started by either the low-voltage power supply or the high-voltage power supply. During normal driving, the motor is powered by the high-voltage power supply and controlled by the high-voltage controller. If the high-voltage part loses power, it is powered by the low-voltage power supply and controlled by the low-voltage controller. Therefore, it can solve the problem that the single-source motor cannot continue to provide torque after the high-voltage power is cut off, and improve safety and reliability.

[0051] Figure 13 For the comparison of the output torque of the unequal tooth width scheme and the equal tooth width scheme of the invention, since the widths of the high-voltage teeth and the low-voltage teeth are adjusted according to the overload requirement, it helps to improve the rated output ability and overload output ability of the motor. The motor output torque under the rated condition and the overload condition is increased by 5.4% and 8.6% respectively.

[0052] Figure 14 For the beneficial effects of the present invention, it can be seen that compared with the existing conventional axial dual-motor scheme, the motor structure of the present invention is reduced by 57%, 57%, 55%, 58% and 64% respectively in the overall axial dimension, overall volume and overall weight of the whole machine; the motor structure of the present invention is increased by 58% and 64% respectively in the power volume density and power mass density.

[0053] Compared with the existing conventional distributed winding dual-winding scheme, the axial dimension, volume and weight of the motor structure of the present invention are respectively reduced by 25%, 25% and 31%; the power density per unit volume and power density per unit mass of the motor structure of the present invention are respectively increased by 34% and 44%. Correspondingly, due to the simplification of raw materials and processing technology, the cost is also greatly reduced.

[0054] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modification or change made by those skilled in the art according to the disclosure of the present invention shall be included in the protection scope recorded in the claims.

Claims

1. A high power density winding isolation type dual source motor device, comprising a rotor assembly and a stator assembly assembled therewith, characterized in that: The stator assembly includes: a stator core, a set of concentrated windings as high-voltage windings and a set of concentrated windings as low-voltage windings. The stator core has high-voltage stator teeth and low-voltage stator teeth alternately distributed along the circumference. The width of the high-voltage stator teeth is greater than the width of the low-voltage stator teeth. The high-voltage windings and low-voltage windings are wound on the stator teeth in layers.

2. The high power density winding isolation type dual source motor device according to claim 1, characterized in that: The high voltage winding and the low voltage winding are wound on the stator teeth in layers. Specifically, the high voltage winding and the low voltage winding are wound on the high voltage stator teeth and the low voltage stator teeth respectively, and the high voltage winding and the low voltage winding are alternately arranged on the same circumference.

3. The high power density winding isolation type dual source motor device according to claim 1, characterized in that: The high-voltage winding and the low-voltage winding are wound on the stator teeth in layers, specifically: the high-voltage winding and the low-voltage winding are respectively wound on the high-voltage stator teeth and the low-voltage stator teeth, and the high-voltage winding is arranged on the same circumference, the low-voltage winding is arranged on the same circumference, and the circumference of the low-voltage winding arrangement is located within the circumference of the high-voltage winding arrangement; or, the high-voltage winding is wound on each stator tooth, the low-voltage winding is wound on each stator tooth, and the circumference of the low-voltage winding arrangement is located within the circumference of the high-voltage winding arrangement.

4. The high power density winding isolation type dual source motor device according to claim 2, characterized in that: In the stator assembly, a winding split tooth structure is formed in the winding slots between adjacent high-voltage stator teeth and low-voltage stator teeth. The winding split tooth structure has winding split tooth insulation. The winding split tooth insulation includes but is not limited to air, insulating paper, insulating skeleton, epoxy resin and slot wedges.

5. The high power density winding isolation type dual source motor device according to claim 3, characterized in that: In the stator assembly, adjacent high-voltage stator teeth and low-voltage stator teeth are provided with grooves or bosses for fixing the winding segmented tooth structure.

6. The high power density winding isolation type dual source motor device according to claim 4 or 5, characterized in that: The high-voltage stator teeth and the low-voltage stator teeth are provided with slot insulation, and the slot insulation includes but is not limited to: slot insulation paper, insulation coating and insulation bracket.

7. The high power density winding isolation type dual source motor device according to claim 4 or 5, characterized in that: The high-voltage winding and the low-voltage winding both adopt the flat copper wire conductor form; or, the high-voltage winding adopts the flat copper wire conductor form, and the low-voltage winding adopts the round copper wire conductor form; or, the high-voltage winding adopts the round copper wire winding form, and the low-voltage winding adopts the flat copper wire conductor form.

8. The high power density winding isolation type dual source motor device according to claim 4 or 5, characterized in that: The number Q of stator teeth in the stator assembly and the number P of rotor poles in the rotor assembly satisfy Q=P±2 or Q=P±4, and Q and P are positive integers respectively.

9. The high power density winding isolation type dual source motor device according to claim 4 or 5, characterized in that: The rotor assembly comprises: a rotor core, a permanent magnet, a rotor pressure plate, a bearing and a rotating shaft, wherein the rotor core is provided with at least one permanent magnet slot and a magnetic isolation slot equidistantly arranged along the circumferential direction, the permanent magnet is assembled in the permanent magnet slot, the rotor core assembled with the permanent magnet is assembled on the rotating shaft, the rotor pressure plate and the bearing are sequentially assembled at the axial front end of the rotor core, and the shape of the permanent magnet slot may include but is not limited to: V-shape, double V-shape, multi-layer V-shape, Spoke-shape, double-layer Spoke-shape, multi-layer Spoke-shape, arc-shape, double-layer arc-shape, multi-layer arc-shape, straight-line shape, double-layer straight-line shape, multi-layer straight-line shape, U-shape, double-layer U-shape, multi-layer U-shape and special-shaped structure.

10. The high power density winding isolation type dual source motor device according to claim 4 or 5, characterized in that: The dual-source motor structure includes but is not limited to: an asynchronous motor, a switched reluctance motor and a wound synchronous motor.

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