A disc-type transverse flux permanent magnet brushless motor with a double-step stator

Abstract

The present application belongs to the field of motor technology, and specifically relates to a disc-type transverse flux permanent magnet brushless motor with a double-step stator, comprising a stator and a rotor, wherein the stator comprises a stator disc and phase armature units arranged in sequence along the circumferential direction at the lower part of the stator disc, and the rotor comprises a rotor disc and a permanent magnet array fixed circumferentially to the upper part of the rotor disc. Each phase armature unit comprises two sub-armature units, and the n phase armature cores of each sub-armature unit are alternately arranged along the circumferential direction, and two adjacent phase armature cores are arranged opposite to each other, which can save winding materials and facilitate assembly, and can also install more phase armature cores to improve torque density; a true fractional slot concentrated winding method is used to reduce harmonics. The present application is suitable for low-speed and high-torque scenarios, and has the advantages of convenient assembly and less consumables, as well as small temperature rise, high torque density and few harmonics.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a disc-type transverse flux permanent magnet brushless motor with a double-step stator. Background Art

[0002] Disc-type transverse flux permanent magnet brushless motors offer numerous advantages, including high torque density, short axial length, excellent low-speed performance, spatial decoupling of the electrical and magnetic circuits, effective resolution of the spatial constraints between stator teeth and coils, and ease of design as multi-pole motors. They have found success in numerous advanced fields, including marine propulsion, wind power generation, in-wheel motors for new energy vehicles, and industrial robotics. Currently, the most widely used stator structures in disc-type transverse flux permanent magnet brushless motors are U-type, E-type, and C-type stators.

[0003] The patent "A disc-type transverse flux permanent magnet brushless motor and method" (authorization number CN 110620449 B) proposes a disc-type transverse flux permanent magnet synchronous motor with a U-shaped stator. Figure 1 As shown in the figure, the armature core is made of U-shaped silicon steel sheets laminated together, and the armature winding adopts centralized winding. Compared with distributed winding, it saves a lot of end windings, but each stator tooth contains two independent coils. For low-speed and high-torque motors, the number of coil turns is usually designed to be large. This cannot avoid many problems such as large amount of coil material consumption, mutual restriction between stator slots and stator teeth, temperature rise, heavy motor, large amount of wire embedding workload and high copper loss.

[0004] Therefore, there is an urgent need for a disc-type transverse flux permanent magnet brushless motor that can solve the above-mentioned problems. Summary of the Invention

[0005] The purpose of this application is to provide a disc-type transverse flux permanent magnet brushless motor with a double-step stator, which can effectively solve many problems existing in traditional disc-type transverse flux permanent magnet synchronous motors, such as a large number of coil turns, large material consumption, mutual constraints between stator slots and stator teeth, high temperature rise, heavy motor, large amount of wire embedding work and high copper loss.

[0006] The embodiments of the present application can be implemented through the following technical solutions:

[0007] A disc-type transverse flux permanent magnet brushless motor with a double-step stator comprises a stator and a rotor. The stator and rotor are upper and lower cylindrical structures and are arranged in a coordinated manner with an air gap between the stator and the rotor. The stator comprises a stator disc and a plurality of phase armature units. The phase armature units are located at the bottom of the stator disc and are arranged sequentially along the circumferential direction on the stator disc.

[0008] The rotor includes a rotor disk and a permanent magnet array. The permanent magnet array is fixed on the rotor disk along a circumferential direction.

[0009] Furthermore, the disc-type transverse flux permanent magnet brushless motor with the double-step stator is an m-phase disc-type transverse flux permanent magnet brushless motor, and the number of the phase armature units is m, where m is a natural number and m≥2.

[0010] Furthermore, each of the phase armature units includes two sub-armature units with identical structures and arranged in reverse symmetry, and each of the sub-armature units includes n adjacent phase armature cores and a phase armature winding that penetrates, connects and fixes the phase armature cores, wherein n is a natural number and n≥1.

[0011] Furthermore, the n phase armature cores of each of the sub-armature units are alternately arranged at intervals along the circumferential direction, and two adjacent phase armature cores are arranged opposite to each other.

[0012] Furthermore, the phase armature core is a double-step L-shaped structure, and the phase armature core includes stator long teeth, stator yoke, stator middle teeth, stator horizontal teeth and stator short teeth. The stator long teeth, the stator middle teeth and the stator short teeth are placed perpendicular to the direction of the stator disk, and the stator yoke and the stator horizontal teeth are placed parallel to the direction of the stator disk.

[0013] Preferably, the phase armature core further includes a stator tooth shoe, and the stator tooth shoe is located on a side of the stator long teeth close to the stator short teeth.

[0014] Furthermore, the phase armature winding is wound on the long teeth of the stator and / or the middle teeth of the stator.

[0015] Furthermore, the permanent magnet array includes a first circumferential array and a second circumferential array, and the first circumferential array and the second circumferential array are coaxially arranged;

[0016] The first circumferential array and the second circumferential array each include 2p permanent magnets, the permanent magnets in the first circumferential array and the permanent magnets in the second circumferential array correspond one to one in the radial direction, the two radially corresponding permanent magnets have opposite polarities and are directly opposite the stator long teeth / stator tooth shoes and stator short teeth; the two circumferentially adjacent permanent magnets in the first circumferential array and the second circumferential array have opposite polarities;

[0017] The permanent magnets have the same pole arc coefficient, the same length and the same thickness.

[0018] Furthermore, the permanent magnet array adopts an axial magnetization method, and two permanent magnets adjacent to each other in the circumferential direction and the radial direction are magnetized in opposite directions.

[0019] Preferably, the disc-type transverse flux permanent magnet brushless motor with a double-step stator is a true fractional slot concentrated winding motor, that is, n / p is an irreducible true fraction.

[0020] Furthermore, the stator disk is made of non-magnetic material, and the rotor disk is made of magnetic material.

[0021] The embodiment of the present application provides a disc-type transverse flux permanent magnet brushless motor with a double-step stator, which has at least the following beneficial effects:

[0022] (1) The phase armature core has a double-step L-shaped structure, which is convenient for winding and can greatly save the amount of winding materials;

[0023] (2) The n phase armature cores of each sub-armature unit are alternately spaced along the circumference, and the adjacent phase armature cores are arranged opposite each other, which not only facilitates installation but also greatly improves the distance between adjacent phase armature cores. With the same motor diameter, more phase armature cores can be installed, which can better improve the motor's torque power and reduce the motor temperature rise;

[0024] (3) This application is a motor with true fractional slot concentrated winding, which has few harmonics and stable rotation.

[0025] The above configuration significantly improves the performance of the disc-type transverse flux permanent magnet brushless motor, while also significantly improving the heat dissipation and lifespan of the motor. This application can be used as both a generator and a motor, and has a good application scenario in low-speed, high-torque scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The figure is a schematic diagram of the three-dimensional structure of a conventional U-shaped stator disc-type transverse flux permanent magnet synchronous motor;

[0027] Figure 2 This is a schematic diagram of a three-dimensional partial structure of a disc-type transverse flux permanent magnet brushless motor with a double-step stator of the present application;

[0028] Figure 3 A side view of a disc-type transverse flux permanent magnet brushless motor with a double-step stator according to the present application;

[0029] Figure 4 A top view of the rotor of the disc-type transverse flux permanent magnet brushless motor with a double-step stator of the present application;

[0030] Figure 5 This is a front view of the adjacent phase armature cores of the disc-type transverse flux permanent magnet brushless motor with a double-step stator in the present application along the circumferential direction;

[0031] Figure 6 This is a schematic diagram of the structure of the disc-type transverse flux permanent magnet brushless motor with a double-step stator in this application, in which the phase armature winding is wound on the middle teeth of the stator;

[0032] Figure 7This is a schematic diagram of the structure of the disc-type transverse flux permanent magnet brushless motor with a double-step stator in the present application, in which the phase armature windings are wound on the long teeth of the stator;

[0033] Figure 8 A top view of the phase armature windings of the disc-type transverse flux permanent magnet brushless motor with a double-step stator of the present application wound on the long teeth and the middle teeth of the stator;

[0034] Figure 9 This is a schematic diagram of the transverse magnetic circuit formed between a single-phase armature core and two radial permanent magnets of the disc-type transverse flux permanent magnet brushless motor with a double-step stator of the present application;

[0035] Figure 10 This is a simulation comparison of the output torque of the disc-type transverse flux permanent magnet brushless motor with a double-step stator in this application and a U-shaped disc-type transverse flux motor with the same motor outer diameter and height.

[0036] Numbers in the figure

[0037] 1. Stator, 11. Stator disk, 12. Phase armature unit, 12-1. Sub-armature unit, 12-2. Sub-armature unit, 12-3. Sub-armature unit, 121. Phase armature core, 121-1. Stator long teeth, 121-2. Stator yoke, 121-3. Stator middle teeth, 121-4. Stator horizontal teeth, 121-5. Stator short teeth, 121-6. Stator tooth shoe, 122. Phase armature winding, 2. Rotor, 21. Rotor disk, 22. Permanent magnet array, 221. First circumferential array, 222. Second circumferential array, 223. Permanent magnet. DETAILED DESCRIPTION

[0038] Hereinafter, the present application will be further described based on preferred embodiments with reference to the accompanying drawings.

[0039] In addition, for ease of understanding, various components in the drawings are enlarged (thickened) or reduced (thinned), but this practice is not intended to limit the scope of protection of this application.

[0040] Words importing the singular include the plural and vice versa.

[0041] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or are the orientation or positional relationship in which the products of the embodiments of the present application are usually placed when in use, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, in the description of the present application, in order to distinguish different units, words such as first and second are used in this specification, but these are not limited by the order of manufacture, nor can they be understood as indicating or implying relative importance. Their names may be different in the detailed description and claims of the present application.

[0042] The vocabulary in this specification is used to illustrate the embodiments of the present application, but is not intended to limit the present application. It should also be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, an indirect connection through an intermediate medium, or a communication between the two components. For those skilled in the art, the specific meanings of the above terms in this application can be specifically understood.

[0043] Figure 2 and Figure 3 The three-dimensional partial structure diagram and side view of the disc-type transverse flux permanent magnet brushless motor with a double-step stator of the present application are shown, as shown in FIG. Figure 2 and Figure 3 As shown, the disc-type transverse flux permanent magnet brushless motor with a double-step stator includes a stator 1 and a rotor 2. The stator 1 and rotor 2 have upper and lower cylindrical structures and are arranged in a coordinated manner. To ensure normal operation of the stator 1 and rotor 2, an air gap is left between the stator 1 and the rotor 2. Specifically, the stator 1 includes a stator disk 11 and multiple phase armature units 12. The phase armature units 12 are located at the bottom of the stator disk 11 and are arranged sequentially along the circumferential direction on the stator disk 11. Specifically, the stator disk 11 is made of a non-magnetic material and is used to fix and support the phase armature units 12.

[0044] It is conceivable that the disc-type transverse flux permanent magnet brushless motor with a double-step stator of the present application can be made into a double-stator single-rotor, a single-stator single-rotor, a single-stator double-rotor or a multi-stator multi-rotor structure. At the same time, the stator can be made into a rotor and the rotor can also be made into a stator, and the structure is more flexible.

[0045] Figure 6-Figure 8 The schematic diagram of the internal connection of the phase armature unit 12 of the disc-type transverse flux permanent magnet brushless motor with a double-step stator of the present application is shown. Figure 6-Figure 8As shown, the number of phase armature units 12 is m, and each phase armature unit 12 includes two sub-armature units 12-i (i=1...m) with identical structures and arranged in opposite directions. Specifically, each sub-armature unit 12-i includes n adjacent phase armature cores 121 and a phase armature winding 122 extending through and connecting the fixed phase armature cores 121. Therefore, the number of sub-armature units 12-i is 2m, and the number of phase armature cores 121 is z=2mn. Furthermore, the phase armature cores 121 are evenly arranged along the circumference of the stator disk 11, and the included angle α1 between the centerlines of adjacent phase armature cores 121 is 360° / z. Specifically, the disc-type transverse flux permanent magnet brushless motor with a double-step stator in the present application is an m-phase n-element disc-type transverse flux permanent magnet brushless motor, wherein m is the number of phases of the motor, n is the number of phase armature cores 121 included in each sub-armature unit 12-i, m and n are both natural numbers and m≥2, n≥1.

[0046] Because adjacent permanent magnets 233 in a disc-type transverse flux permanent magnet brushless motor have opposite magnetization directions, the magnetic flux directions in adjacent phase armature cores 121 are opposite. Specifically, the n phase armature cores 121 of each sub-armature unit 12-i are arranged alternately along the circumference, with two adjacent phase armature cores 121 arranged opposite each other. This ensures that the magnetic flux directions of the phase armature cores 121 and the phase armature winding 122 turns of the same sub-armature unit 12-i are the same at all times. This arrangement not only converts magnetic circuits with different directions into the same direction, but also facilitates assembly and saves consumables. Furthermore, compared to a conventional disc-type transverse flux permanent magnet brushless motor of the same outer diameter, the present application can significantly increase the number of phase armature cores 121, thereby achieving an increased torque density.

[0047] Figure 5 FIG. 1 shows a front view of adjacent phase armature cores 121 of a disc-type transverse flux permanent magnet brushless motor with a double-step stator according to the present invention along the circumferential direction, as shown in FIG. Figure 5 As shown, the phase armature core 121 has a double-step L-shaped structure and includes a stator long tooth 121-1, a stator yoke 121-2, a stator middle tooth 121-3, a stator horizontal tooth 121-4, and a stator short tooth 121-5, which are connected in sequence. The stator long teeth 121-1, the stator middle teeth 121-3, and the stator short teeth 121-5 are arranged perpendicular to the plane of the stator disk 11, while the stator yoke 121-2 and the stator horizontal teeth 121-4 are arranged parallel to the plane of the stator disk 11. Specifically, the phase armature winding 122 is wound around the stator long teeth 121-1 and / or the stator middle teeth 121-3.

[0048] Specifically, if Figure 6As shown, the phase armature winding 122 is wound on the stator middle teeth 121-3, which can save the amount of winding materials to the greatest extent, improve the material utilization rate and space utilization rate of the disc-type transverse flux permanent magnet brushless motor, and reduce the temperature rise of the disc-type transverse flux permanent magnet brushless motor. Figure 7 As shown, the phase armature winding 122 is wound on the stator long tooth 121-1, so that the end of the phase armature winding 122 is placed on the stator horizontal tooth 121-4 of the adjacent phase armature core 121, so as to maximize the use of the winding space of the phase armature winding 122, thereby providing more placement space for the phase armature core 121, increasing the number of phase armature cores 121 and improving the torque density of the disc-type transverse flux permanent magnet brushless motor. Figure 8 As shown, the phase armature winding 122 is wound around both the long stator teeth 121-1 and the middle stator teeth 121-3. Compared to winding the phase armature winding 122 only around the middle stator teeth 121-3, this winding method can make greater use of the winding space of the phase armature winding 122, thereby providing more space for the phase armature cores 121, increasing the number of phase armature cores 121 and improving the torque density of the disc-type transverse flux permanent magnet brushless motor. Compared to winding the phase armature winding 122 only around the long stator teeth 121-1, this winding method can save the amount of winding material, thereby improving the material utilization and space utilization of the disc-type transverse flux permanent magnet brushless motor. Preferably, the ends of the stator middle teeth 121-3 of the phase armature core 121 are located on the circumference of the same circle, which can further save the amount of winding material.

[0049] Preferably, the radial lengths of the stator yoke 121-2 and the stator horizontal teeth 121-4 are equal to each other in order to fully utilize the space between adjacent phase armature windings 122. Preferably, the length of the stator short teeth 121-5 should be shortened as much as possible in order to avoid excessive magnetic flux leakage.

[0050] like Figure 1 and Figure 2 As shown, the rotor 2 includes a rotor disk 21 and a permanent magnet array 22. The permanent magnet array 22 is fixed on the rotor disk 21 along the circumferential direction. Figure 4As shown, the permanent magnet array 22 includes a first circumferential array 221 and a second circumferential array 222. The first circumferential array 221 and the second circumferential array 222 are coaxially arranged. The first circumferential array 221 is fixed to the inner ring of the rotor disk 21, and the second circumferential array 222 is fixed to the outer ring of the rotor disk 21. The rotor disk 21 is made of a magnetically conductive material. Specifically, the first circumferential array 221 and the second circumferential array 222 each include 2p equally spaced permanent magnets 223. The centerline angle α2 between adjacent permanent magnets 223 is 360° / (2p). The permanent magnets 223 in the first circumferential array 221 and the second circumferential array 222 correspond one-to-one in the radial direction. The two radially corresponding permanent magnets 223 have opposite polarities and face the stator long teeth 121-1 and stator short teeth 121-5. The circumferentially adjacent permanent magnets 223 in the first circumferential array 221 and the second circumferential array 222 have opposite polarities. Furthermore, the two permanent magnets 223 on the same central axis form a loop with each other, that is, the permanent magnet array 22 adopts an axial magnetization method, and the two permanent magnets 223 adjacent in the circumferential direction and the radial direction are magnetized in opposite directions.

[0051] Figure 9 FIG. 1 shows a schematic diagram of a transverse magnetic circuit formed between a single-phase armature core 121 and two radial permanent magnets 223 of a disc-type transverse flux permanent magnet brushless motor with a double-step stator of the present application. Figure 9 As shown, the magnetic circuit of the permanent magnetic flux is: the N pole of the permanent magnet 223 → air gap → stator short tooth 121-5 → stator horizontal tooth 121-4 → stator yoke 121-2 → stator long tooth 121-1 → S pole of the permanent magnet 223 → rotor disk 21 → N pole of the permanent magnet 223, thus forming a closed loop.

[0052] Preferably, if Figure 5 As shown, to reduce magnetic resistance, the phase armature core 121 further includes a stator tooth shoe 121-6, which is located on the side of the stator long tooth 121-1 near the stator short tooth 121-5. Specifically, the two radially corresponding permanent magnets 223 have opposite polarities and face the stator tooth shoe 121-6 and stator short tooth 121-5. Furthermore, the magnetic path of the permanent magnetic flux is: the north pole of the permanent magnet 223 → the air gap → the stator short tooth 121-5 → the stator horizontal tooth 121-4 → the stator yoke 121-2 → the stator long tooth 121-1 → the stator tooth shoe 121-6 → the south pole of the permanent magnet 223 → the rotor disk 21 → the north pole of the permanent magnet 223, thus forming a closed loop.

[0053] Specifically, two radially oppositely polarized permanent magnets 223 face the stator tooth shoe 121-6 and the stator short tooth 121-5. Preferably, to fully utilize the permanent magnets 223 and effectively reduce inter-pole magnetic flux leakage, the distance between the stator long tooth 121-1 and the stator tooth shoe 121-6 is equal to the distance between the two radially corresponding permanent magnets 223.

[0054] Specifically, when three-phase alternating current is passed through the phase armature winding 122, a synchronously rotating magnetic field is formed, which interacts with the magnetic field generated by the permanent magnet 223 to generate a synchronous electromagnetic torque, thereby driving the motor to rotate. At this time, the disc-type transverse flux permanent magnet brushless motor with a double-step stator of the present application can be used as an electric motor. Specifically, when the rotor disk 21 rotates, the magnetic field generated by the permanent magnet 223 rotates synchronously, the magnetic flux within the phase armature core 121 alternates, and the phase armature winding 122 induces an induced electromotive force. At this time, the disc-type transverse flux permanent magnet brushless motor with a double-step stator of the present application can be connected to a load and used as a generator.

[0055] Specifically, the permanent magnets 223 have the same pole arc coefficient, length, and thickness. In some preferred embodiments of the present application, the permanent magnets 223 are made of neodymium iron boron material. In some preferred embodiments of the present application, the permanent magnets 223 are fan-shaped. It is conceivable that the permanent magnets 223 may also be rectangular, isosceles trapezoidal, or other shapes.

[0056] Preferably, in order to reduce harmonics and ensure smooth rotation of the motor, the disc-type transverse flux permanent magnet brushless motor with a double-step stator of the present application is a true fractional slot concentrated winding motor. Specifically, the number of slots per pole per phase q is an irreducible true fraction, that is, the number of slots that each phase should occupy under each magnetic pole. Specifically, the number of slots corresponds to the number of phase armature cores 121, and the number of magnetic poles corresponds to the number of permanent magnets 223 in the first circumferential array 221, then q = 2mn / (2pm) = n / p is an irreducible true fraction. Through the above settings, the motor can be rotated to any position, and there is no situation where the phase armature core 121 and the permanent magnet 223 completely correspond to each other, thereby reducing the generation of harmonics and ensuring the smooth rotation of the motor.

[0057] Figure 10 The output torque simulation comparison diagram of the disc-type transverse flux permanent magnet brushless motor with a double-step stator of the present application and the U-shaped disc-type transverse flux motor with the same motor outer diameter and height is shown as follows. Figure 10 As shown, using motor simulation software, the output torque of the disc-type transverse flux permanent magnet brushless motor with a U-shaped stator and the disc-type transverse flux permanent magnet brushless motor with a double-step stator of the same motor outer diameter and height are compared. It can be seen that the output torque of the disc-type transverse flux permanent magnet brushless motor with a double-step stator is larger, which further verifies the effectiveness of the disc-type transverse flux permanent magnet brushless motor with a double-step stator of the present application.

[0058] The above is a detailed introduction to the specific implementation methods of the present application. For those skilled in the art, several improvements and modifications can be made to the present application without departing from the principles of the present application. These improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A disc-type transverse flux permanent magnet brushless motor with a double-step stator, comprising a stator and a rotor, wherein the stator and rotor are cylindrical structures and are arranged in a vertically coordinated manner, with an air gap between the stator and the rotor, and characterized by: The stator includes a stator disc and a plurality of phase armature units, wherein the phase armature units are located at the lower portion of the stator disc and are sequentially arranged on the stator disc along a circumferential direction; The rotor comprises a rotor disk and a permanent magnet array, wherein the permanent magnet array is fixed on the rotor disk along the circumferential direction; The disc-type transverse flux permanent magnet brushless motor with the double-step stator is an m-phase disc-type transverse flux permanent magnet brushless motor, and the number of the phase armature units is m, where m is a natural number and m≥2; Each of the phase armature units includes two sub-armature units with identical structures and arranged in reverse symmetry, each of the sub-armature units includes n adjacent phase armature cores and a phase armature winding penetrating and connecting the phase armature cores, wherein n is a natural number and n≥1; The n phase armature cores of each sub-armature unit are alternately arranged along the circumferential direction, and two adjacent phase armature cores are arranged opposite to each other; The phase armature core has a double-step L-shaped structure, and includes stator long teeth, a stator yoke, a stator middle teeth, a stator horizontal teeth, and a stator short teeth connected in sequence. The stator long teeth, the stator middle teeth, and the stator short teeth are placed in a direction perpendicular to the stator disk, and the stator yoke and the stator horizontal teeth are placed in a direction parallel to the stator disk. The phase armature core further includes a stator tooth shoe, and the stator tooth shoe is located on a side of the stator long tooth close to the stator short tooth; The phase armature winding is wound on the long stator teeth and / or the middle stator teeth.

2. The disc-type transverse flux permanent magnet brushless motor with a double-step stator according to claim 1, characterized in that: The permanent magnet array includes a first circumferential array and a second circumferential array, wherein the first circumferential array and the second circumferential array are coaxially arranged; The first circumferential array and the second circumferential array each include 2p permanent magnets, the permanent magnets in the first circumferential array and the permanent magnets in the second circumferential array correspond one to one in the radial direction, the two radially corresponding permanent magnets have opposite polarities and are directly opposite the stator long teeth / stator tooth shoes and stator short teeth; the two circumferentially adjacent permanent magnets in the first circumferential array and the second circumferential array have opposite polarities; The permanent magnets have the same pole arc coefficient, the same length and the same thickness.

3. The disc-type transverse flux permanent magnet brushless motor with a double-step stator according to claim 2, characterized in that: The permanent magnet array adopts an axial magnetization method, and two permanent magnets adjacent to each other in the circumferential direction and the radial direction are magnetized in the circumferential direction, and the magnetization directions are opposite.

4. The disc-type transverse flux permanent magnet brushless motor with a double-step stator according to claim 2, characterized in that: The disc-type transverse flux permanent magnet brushless motor with a double-step stator is a true fractional slot concentrated winding motor, that is, n / p is an irreducible true fraction.

5. The disc-type transverse flux permanent magnet brushless motor with a double-step stator according to claim 1, characterized in that: The stator disk is made of non-magnetic conductive material, and the rotor disk is made of magnetic conductive material.

Images