CN114094726A

CN114094726A - Transverse flux motor stator and rotor assembly and transverse flux motor

Info

Publication number: CN114094726A
Application number: CN202010761326.1A
Authority: CN
Inventors: 李树才; 孙蕾; 张文晶; 薛成勇; 卞广伟; 张再成; 赵孔祥
Original assignee: Shandong Jingchuang Technology Research Institute Of Magnetoelectrics Industry Co ltd
Current assignee: Shandong Jingchuang Technology Research Institute Of Magnetoelectrics Industry Co ltd
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2022-02-25

Abstract

The invention discloses a transverse flux motor stator and rotor assembly and a transverse flux motor, and belongs to the field of motors. It includes an outer rotor assembly and a stator assembly. The stator assembly comprises a multi-phase stator module, each phase of stator module comprises two stator toothed plates and a stator yoke ring, and a coil wound by taking the axial direction as the center is arranged between the two stator toothed plates. The outer rotor component comprises a rotor yoke ring, multiple rows of magnetic steels distributed along the axial direction are arranged on the inner surface of the rotor yoke ring, the number of rows of the magnetic steels is the same as the number of phases of the stator module, the magnetizing direction of the magnetic steels is radial, the number of the magnetic steels in each row is 2 times of the number of the stator teeth on the stator toothed plate, the magnetic field directions of two adjacent magnetic steels in each row are opposite, and the magnetic field directions of two adjacent magnetic steels in each row are the same. The three-dimensional magnetic circuit structure is realized by combining the silicon steel sheet stator toothed plate and the SMC stator yoke ring, the manufacturing difficulty is low, the working time and the cost are low, the coil winding is convenient, more poles can be manufactured, and the torque pulsation of the motor is reduced.

Description

Transverse flux motor stator and rotor assembly and transverse flux motor

Technical Field

The invention relates to the field of motors, in particular to a transverse flux motor stator-rotor assembly and a transverse flux motor.

Background

The transverse flux motor is different from a radial flux motor and an axial flux motor which are in the traditional structures, and magnetic lines of force in the transverse flux motor are distributed in a three-dimensional mode and have high torque density. The outer rotor transverse flux motor is a structural form of a transverse flux motor and is generally used for a hub motor of an electric vehicle.

The traditional hub motor is generally an outer rotor radial flux motor, the rotor of the hub motor is convenient to manufacture, but the winding of the stator is difficult. Each phase of the outer rotor radial flux motor is provided with a plurality of grooves in the circumferential direction, and each groove is separately embedded with wires during coil winding, so that the winding mode is complex, and particularly when the number of poles of the motor is large, the winding difficulty can be greatly increased. For example, in the hub motor for the electric vehicle in which three-phase stator windings are arranged along the circumferential direction, the stator adopts a more-slot structure to be matched with the rotor, the complexity of stator winding is increased sharply due to the increase of the number of slots, the working hours of coil assembly are long, and mechanical equipment is expensive, so that the number of poles of the traditional outer rotor radial flux motor cannot be increased.

Because the magnetic circuit of the transverse flux motor is a three-dimensional structure, the traditional stator structure is generally formed by laminating silicon steel sheets, the silicon steel sheets are two-dimensional magnetic circuit materials, and the three-dimensional magnetic circuit structure manufactured by the two-dimensional magnetic circuit materials is difficult to realize.

In the prior art, a three-dimensional magnetic circuit is generally realized in a form of a segmented stator, for example, a stator mentioned in chinese patent document CN209692560U adopts a segmented structure, and positioning of modules and flatness after assembly are difficult problems, which have high assembly requirements, high manufacturing difficulty, increased working hours and cost, and great difficulty in making a large number of poles.

In addition, in the radial direction, the space closer to the center of the circle is smaller, and the space farther from the center of the circle is larger, so that the silicon steel sheets must be laminated along the circumferential direction in order to realize the three-dimensional magnetic circuit after the silicon steel sheets are laminated, and thus, the space close to the inner side in the radial direction is occupied and then a gap is formed at the position close to the outer side, so that the space utilization rate in the motor is not high, the magnetic flux path is narrow, the magnetic circuit is easy to saturate, and the load capacity of the motor is low.

And the other stators are formed by laminating silicon steel sheets, a three-dimensional magnetic circuit motor is manufactured by pure two-dimensional magnetic circuit materials, the manufacturing process is complex, and the whole stator needs to be encapsulated and fixed. And in order to ensure the realization of a three-dimensional magnetic circuit, the stator yoke part adopts a method of splicing silicon steel sheets along the circumferential direction. The motor stator yoke manufactured by the method has the advantages of complex structure, high manufacturing difficulty and space waste, the magnetic flux on the stator teeth on the two sides of the coil is difficult to be perfectly connected with the yoke, the magnetic flux path is narrow, the magnetic circuit is easy to saturate, the magnetic flux of the stator is reduced, the load capacity of the motor is influenced, and the output of the motor is limited.

Disclosure of Invention

In order to solve the technical problems, the invention provides a transverse flux motor stator and rotor assembly and a transverse flux motor.

The technical scheme provided by the invention is as follows:

a transverse flux electric machine stator-rotor assembly comprising an outer rotor assembly and a stator assembly disposed inside the outer rotor assembly, wherein:

the stator assembly comprises a plurality of phases of stator modules which are fixed together, and each phase of stator module comprises two annular stator toothed plates which are formed by laminating silicon steel sheets along the axial direction and a stator yoke ring which is made of soft magnetic composite material;

the stator yoke ring is positioned in the inner circles of the two stator toothed plates of the same-phase stator module and fixedly connected with the two stator toothed plates, and a coil wound by taking the axial direction as the center is arranged between the two stator toothed plates of the same-phase stator module;

the outer rotor assembly comprises a rotor yoke ring made of a magnetic conductive material, wherein a plurality of rows of magnetic steels distributed along the axial direction are arranged on the inner surface of the rotor yoke ring, the number of rows of the magnetic steels is the same as that of the stator modules, and the magnetizing directions of the magnetic steels are radial;

the magnet steel quantity of each row is 2 times of stator tooth quantity on a stator pinion rack, and a plurality of magnet steels of each row are along circumference evenly distributed to two adjacent magnet steels of adjacent row are the same in ascending position in circumference, and the magnetic field opposite direction of two adjacent magnet steels in each row, and the magnetic field direction of two magnet steels of adjacent row same position is the same.

Furthermore, an annular step bulge is arranged on the outer surface of the stator yoke ring, a positioning groove is formed in the outer surface of the stator yoke ring, an inward positioning bulge is arranged on the inner circle of the stator toothed plate, and a wire outlet is formed in the stator yoke ring.

Further, a first group of bolt holes are formed in the contact surface between the stator toothed plate and the stator yoke ring, each hole in the first group of bolt holes comprises a first half hole located on the stator toothed plate and a second half hole located on the stator yoke ring, the central angle of the first half hole is larger than 180 degrees, and the central angle of the second half hole is smaller than 180 degrees.

Further, the adjacent two-phase stator modules are spaced by a gasket, a gasket positioning groove is formed in the position, located in the first half hole, of the stator toothed plate, a gasket mounting groove is formed in the position, located in the second half hole, of the stator yoke ring, the gasket comprises a gasket body and a positioning plate perpendicular to the gasket body, the gasket body is arranged in the gasket mounting groove, and the positioning plate is arranged in the gasket positioning groove.

Furthermore, insulating materials are arranged between the coil and the stator toothed plate and between the coil and the stator yoke ring, the silicon steel sheets are laminated in a welding mode to form the stator toothed plate, and the stator toothed plate is provided with a slotted hole.

Furthermore, a groove is formed in the position, located between the two adjacent rows of the magnetic steels, on the outer surface of the rotor yoke ring, and a spacing washer made of a non-magnetic-conductive material is arranged between the two adjacent rows of the magnetic steels on the inner surface of the rotor yoke ring.

Furthermore, a second group of bolt holes are formed in the center of the magnetic steel, the magnetic steel is fixed to the inner surface of the rotor yoke ring through the second group of bolts, and the spacing washer is fixed to the inner surface of the rotor yoke ring and the magnetic steel through glue.

Further, a gap is formed between every two adjacent magnetic steels in each row or a gap is not formed between every two adjacent magnetic steels in each row, and the gap is filled with glue.

Furthermore, the multiphase stator module is three-phase, the side face of the rotor yoke ring is provided with an end cover bolt hole for fixing an end cover, and the outer surface of the rotor yoke ring is used for installing a shell hub.

A transverse flux motor comprises the transverse flux motor stator-rotor assembly.

The invention has the following beneficial effects:

1. three-dimensional magnetic structure has been realized through the form that silicon steel sheet stator pinion rack and SMC stator yoke ring combine, need not set up the segmentation stator, also need not fold through the silicon steel sheet and press and obtain stator yoke portion, it is not high to the assembly requirement, the preparation degree of difficulty is low, man-hour, with low costs, can make more number of poles, and the stator space utilization of this kind of structure is high, make magnetic flux and the perfect linking of stator yoke ring on the stator pinion rack, the magnetic flux path is wide, the magnetic circuit is difficult to the saturation, the load capacity of motor is strong, the play dynamic height.

2. The structure of two silicon steel sheet stator toothed plates and SMC stator yoke rings makes each phase magnetic field of motor keep apart each other, and the stator winding of motor just can be accomplished to every coil of looks, has avoided the difficult problem of traditional radial magnetic field motor wire winding. Simultaneously, the number of poles of motor increases can not influence the wire winding, if need increase the number of poles of motor, only need on the stator pinion rack directly increase the stator tooth the quantity can, therefore the motor can be designed into the winding space when more number of poles is not influenced, can increase the number of poles of motor as far as possible, promotes motor torque, consequently is particularly useful for the occasion of the big moment of torsion of low-speed.

3. The arrangement mode of the magnetic steel of the external rotor motor in the prior art is generally a single-row structure, and the single-row structure can cause the phenomenon of larger torque pulsation of the motor.

Drawings

FIG. 1 is a perspective view of a transverse-flux electric machine stator-rotor assembly in accordance with the present invention;

FIG. 2 is a cross-sectional view of a transverse-flux electric machine stator-rotor assembly in accordance with the present invention;

fig. 3 is a perspective view of a multi-phase stator module;

FIG. 4 is an exploded view of a multi-phase stator module;

FIG. 5 is a perspective view of a phase stator module;

FIG. 6 is an exploded view of a phase stator module;

figure 7 is a perspective view of the stator tooth plate;

fig. 8 is a perspective view of the stator yoke ring;

FIG. 9 is a perspective view of the rotor assembly;

FIG. 10 is an exploded view of the rotor assembly;

FIG. 11 is a perspective view of the stator shaft;

fig. 12 is a perspective view of the first side panel and the second side panel.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

An embodiment of the present invention provides a transverse flux motor stator-rotor assembly, as shown in fig. 1-12, which includes an outer rotor assembly 100 and a stator assembly 200 disposed inside the outer rotor assembly 100, wherein:

the stator assembly 200 includes a plurality of stator modules 201 fixed together, and each stator module 201 includes two annular stator tooth plates 202 formed by laminating silicon steel sheets in an axial direction and a stator yoke ring 203 made of a Soft Magnetic Composite (SMC).

The stator teeth 204 are disposed on the outer periphery of the stator tooth plate 202, the specific arrangement of the stator teeth is not limited in the present invention, and in one example, a plurality of grooves are disposed on the outer periphery of the stator tooth plate, and a stator tooth is formed between two adjacent grooves.

Two stator tooth plates 202 of the same phase stator module 201 differ by 180 electrical angles, a stator yoke ring 203 is positioned in the inner circle of the two stator tooth plates 202 of the same phase stator module 201 and is fixedly connected with the two stator tooth plates 202, a coil 205 wound by taking the axial direction as the center is arranged between the two stator tooth plates 202 of the same phase stator module 201, and the stator tooth plates, the stator yoke ring and the coil are combined together to form one phase of the stator.

The outer rotor assembly 100 comprises a rotor yoke ring 101 made of a magnetic conductive material, a plurality of rows of magnetic steels 102 distributed along the axial direction are arranged on the inner surface of the rotor yoke ring 101, the number of rows of the magnetic steels 102 is the same as that of the stator modules 201, and the magnetizing direction of the magnetic steels 102 is radial;

the magnetic steel of each row is a phase of the rotor, the number of the magnetic steels 102 of each row is the number of poles of the rotor, two stator toothed plates 202 of the same-phase stator module 201 have a 180-degree electrical angle difference, the number of poles of the stator is the total number of the stator teeth on the two stator toothed plates, namely 2 times the number of the stator teeth 204 on one stator toothed plate 202, and the number of poles of the rotor is the same as the number of poles of the stator.

A plurality of magnet steels 102 of each row (i.e. the magnet steel of each phase of the rotor) are uniformly distributed along the circumferential direction, and the adjacent two magnet steels of adjacent rows are the same in the circumferential direction, the magnetic field directions of the adjacent two magnet steels 102 in each row are opposite, and the magnetic field directions of the two magnet steels 102 in the same position of the adjacent rows are the same.

In the invention, two stator toothed plates, one stator yoke ring and one coil are combined together to form one phase of a stator, and the two stator toothed plates and the one stator yoke ring under the same phase form a stator magnetic circuit; one row of magnetic steels form one phase of the rotor, two adjacent magnetic steels of the same phase form a rotor magnetic circuit, and the stator magnetic circuit and the rotor magnetic circuit form the whole magnetic circuit of the motor, so that the transmission process of the whole three-dimensional magnetic circuit is realized.

The description is given by taking as an example the position where one stator tooth (first stator tooth) on one stator tooth plate in the same phase of the stator aligns to one magnetic steel (first magnetic steel) in the same phase of the rotor, and the stator tooth (second stator tooth) on the other stator tooth plate in the same phase of the stator, which is adjacent to the first stator tooth, aligns to the magnetic steel (second magnetic steel) in the same phase of the rotor, which is adjacent to the first magnetic steel.

The specific stator magnetic circuit is as follows: the stator toothed plate formed by laminating the silicon steel sheets along the axial direction realizes radial magnetic conduction, so that a magnetic field generated by first magnetic steel on the outer rotor assembly is radially and inwardly propagated to a stator yoke ring made of soft magnetic composite material from a first stator tooth on one stator toothed plate. Due to the three-dimensional magnetic permeability of the soft magnetic composite material, a magnetic field can be transmitted in any direction in the soft magnetic composite material, the actual transmission direction of the magnetic field in the stator yoke ring is axial, and the transition of the magnetic field from one stator toothed plate to another stator toothed plate is realized. Then the magnetic field radially outwards propagates to the second stator tooth on this stator tooth plate in another stator tooth plate, and first stator tooth and second stator tooth are located two stator tooth plates respectively and are adjacent, then propagate to the second magnet steel on the outer rotor by this second stator tooth.

The rotor magnetic circuit is: the magnetic field enters the second magnetic steel from the second stator tooth, then the magnetic field is transmitted to the first magnetic steel along the circumferential direction in the rotor yoke ring on the outer rotor, and then is transmitted to the first stator tooth from the first magnetic steel.

In the whole magnetic circuit of the motor formed by the stator magnetic circuit and the rotor magnetic circuit, the propagation path of the magnetic field comprises the radial direction, the axial direction and the circumferential direction, so that the magnetic circuit is a three-dimensional magnetic circuit.

The invention has the following beneficial effects:

The whole of stator yoke ring 203 is ring structure, can be provided with annular step arch 206 on the surface of stator yoke ring 203, and two stator toothed plates set up respectively in the both sides of stator yoke ring, form stator magnetic circuit. The magnetic flux flows through the part outside the annular step bulge to form a main magnetic circuit, and the annular step bulge assists in magnetic conduction. The magnetic flux in the stator tooth plate silicon steel sheet should be guaranteed to switch on completely in the stator yoke ring at the junction of stator yoke ring and stator tooth plate, whether thickness dimension after the stator tooth plate is folded and stator yoke ring reserve the magnetic conduction of stator tooth plate to link up suitable on the design tolerance cooperation, should make the inner ring of stator tooth plate contact with stator yoke ring on the thickness direction completely.

In addition, a positioning groove 207 is formed on the outer surface of the stator yoke ring 203, an inward positioning protrusion 208 is formed on the inner circle of the stator tooth plate 202, and an outlet 209 is formed on the stator yoke ring 203. The positioning groove and the positioning bulge realize circumferential positioning of the stator toothed plates, and the fact that the two stator toothed plates differ by 180-degree electrical angles is guaranteed. The shape of the positioning groove and the positioning bulge is preferably a square structure, and other shapes of structures are also possible.

The stator yoke ring is made of three-dimensional magnetic conductive materials such as SMC and the like, and can be made in a mould pressing and processing mode. If the sectional area of stator yoke ring mould pressing is too big, when the pressure value of press can not reach the requirement of mould pressing, can cut apart into different fritts with the stator yoke ring and carry out the mould pressing respectively, splice into a whole at last to the stator yoke ring piece of piecemeal will guarantee the accuracy of two stator pinion racks of connecting each other to fix a position.

The soft magnetic composite material has relatively poor mechanical strength, and in order to avoid the damage caused by torque, vibration, electromagnetic force and the like borne by a stator yoke ring, the invention adopts the following structure:

the multiphase stator module is fixed together through a first group of bolts and fixed on a stator shaft, a first group of bolt holes 218 are formed in the contact surface of the stator tooth plate 202 and the stator yoke ring 203, specifically, a first side plate 219 and a second side plate 220 are respectively arranged on two sides of the multiphase stator module, a third group of bolt holes 221 are formed in the first side plate 219 and the second side plate 220, a first group of bolts 233 penetrates through the first group of bolt holes 218 and the third group of bolt holes 221 to fix the first side plate 219, the second side plate 220 and the multiphase stator module 201 together, and then the first side plate 219 and the second side plate 220 are fixed together with the stator shaft 222.

Each of the first set of bolt holes 218 includes a first half hole 211 located on the stator tooth plate 202 and a second half hole 212 located on the stator yoke ring 203, the first half hole 211 having a central angle greater than 180 °, and the second half hole 212 having a central angle less than 180 °.

The invention clamps the multiphase stator modules together by means of the first and second side plates and fixes the entire multiphase stator module to the stator shaft. When the motor rotates, the multi-phase stator module has certain torque relative to the outer rotor assembly, the torque falls on the stator toothed plate, the torque borne by the stator toothed plate is transmitted to the stator shaft through the first group of bolts and other connecting mechanisms, and the stator yoke ring made of the soft magnetic composite material is a structural member which does not bear the torque, so that the stator yoke ring is prevented from being damaged due to the bearing of the torque.

And because the part that first group bolt hole is located the stator pinion rack is greater than 180 degrees, is located the part on the stator yoke ring and is less than 180, so the pressure that first group bolt bore can press on the stator pinion rack that the silicon steel sheet formed, and can not bear on the stator yoke ring, prevents that the stator yoke ring from damaging because of bearing pressure.

In order to fix the first side plate and the second side plate on the stator shaft 222, the first side plate 219 and the second side plate 220 are symmetrical in shape, a fourth group of bolt holes 223 are formed in the first side plate 219 and the second side plate 220, a plurality of protruding structures 224 are arranged on the stator shaft 222, the outer surfaces of the protruding structures 224 are in contact with the inner circle of the stator yoke ring 203, a fifth group of bolt holes 225 are formed in two side surfaces of the protruding structures 224, and the third group of bolts 226 penetrate through the fourth group of bolt holes 223 and the fifth group of bolt holes 225 to fixedly connect the first side plate 219 and the second side plate 220 with the two side surfaces of the protruding structures 224 respectively.

The multi-phase stator module is clamped by two side plates, and a plurality of first group of bolts penetrate through the multi-phase stator module to be fixed on the two side plates. The side plates are fixedly connected with the stator shaft through a third group of bolts, so that torque can be transmitted to the stator shaft from the stator toothed plates. Moreover, the outer diameter of the stator shaft is smaller than the inner diameter of the stator yoke ring, so that the stator shaft and the stator yoke ring are positioned in a contact manner, a protruding structure needs to be arranged on the stator shaft, and the side surface of the protruding structure can be used as a fixing surface of the first side plate and the second side plate.

In order to prevent the side plates from pressing on the stator tooth plate 202, and to make the stator yoke ring bear the pressure of the bolt, the portion of the first side plate/second side opposite to the stator yoke ring is recessed inward, so that there is no pressure between the first side plate/second side and the stator yoke ring.

The other sides of the first side plate 219 and the second side plate 220 are provided with weight-reducing grooves 227, the inner circles of the first side plate 219 and the second side plate 220 are provided with inward lugs 228, and the fourth group of bolt holes 223 are formed in the lugs 228.

The stator shaft 222 is a hollow shaft, the stator shaft 222 is provided with an outlet hole 229 serving as an outlet of the stator and the hall element, the outlet hole is communicated with a central hole of the stator shaft, and the conducting wires can be led to one side or two sides of the stator according to requirements.

The two ends of the stator shaft 222 are provided with positioning planes 230, and the two ends of the stator shaft 222 are provided with threads on arcs 231 outside the positioning planes 230. The parallel surface is used for being fixed with an external device, and the two arc surfaces outside the plane are provided with threads which can be fixed by nuts.

Bearing mounting positions 232 are arranged on two sides of the stator shaft 222, and bearings are mounted on the bearing mounting positions 232 and used for supporting a motor end cover.

In order to isolate the magnetic fields of each phase of the motor from each other to avoid the magnetic fields in the stator phases from interfering with each other, it is necessary to space adjacent two stator modules apart by a certain distance, in one example, the adjacent two stator modules 201 are spaced apart by spacers 210.

The stator tooth plate 202 is provided with a gasket positioning groove 214 at the first half hole 211, the stator yoke ring 203 is provided with a gasket mounting groove 213 at the second half hole 212, the gasket 210 comprises a gasket body 215 and a positioning plate 216 perpendicular to the gasket body 215, the gasket body 215 is arranged in the gasket mounting groove 213, and the positioning plate 216 is arranged in the gasket positioning groove 214.

Adjacent two looks of stator are through first group bolted connection, through the gasket interval and spacing, and the certain electrical angle interval of stator pinion rack between adjacent two can be guaranteed to the locating plate on gasket constant head tank and the gasket.

Insulating materials are arranged among the coil 205, the stator toothed plate 202 and the stator yoke ring 203, and an insulating effect is guaranteed.

The stator yoke ring 203 is provided with an outlet 209, so that the coil can be led out from the inner circle of the stator yoke ring, the size of the outlet can be determined according to the wire diameter size of the wire, and an insulating space needs to be reserved.

In the invention, the silicon steel sheets can be laminated into the stator tooth plate 202 by welding, and the stator tooth plate 202 is provided with the welding port 217.

In order to reduce the weight of the stator assembly, a slot may be formed in the stator toothed plate 202, specifically, the slot is formed in the middle of the stator toothed plate at a position with a low magnetic density.

The outer rotor motor in the prior art is generally a single-row magnetic steel, even though some multi-row magnetic steel is designed, the multi-row magnetic steel is pasted on the inner ring of the rotor yoke in a mode of deflecting a certain electric angle (or mechanical angle), the difficulty of pasting the magnetic steel on the inner ring of the rotor yoke is high, and the angle installation accuracy is not easy to guarantee. The magnetic steel position may be deviated by the electromagnetic force when the motor operates (the glue has the probability of instability and weakness in the heating environment), and the assembly workload is increased by increasing the number of rows of the magnetic steel. In addition, the magnetic fluxes of the multiple rows of magnetic steels interfere with each other when flowing through the rotor yoke.

In the invention, a groove 105 is arranged on the outer surface of the rotor yoke ring 101 at the position between two adjacent rows of magnetic steels, and a spacing washer 106 made of non-magnetic material is arranged on the inner surface of the rotor yoke ring 101 at the position between two adjacent rows of magnetic steels.

The recess on the rotor yoke ring surface can increase the magnetic resistance between two rows of magnet steels, increases alternate magnetic resistance promptly, reduces the mutual interference of alternate magnetic flux when circulating on the rotor yoke ring for each looks magnetic field of motor is kept apart each other, has further reduced the torque ripple of motor, and simultaneously, the interval packing ring also can keep apart the magnetic field of looks, reduces the torque ripple.

The center of magnet steel 102 has a second set of bolt holes 103, correspondingly, the corresponding position of the inner surface of the rotor yoke ring has a threaded hole for connecting with the bolt, magnet steel 102 is fixed to the inner surface of rotor yoke ring 101 by a second set of bolts 104, and spacer washer 106 is fixed to the inner surface of rotor yoke ring 101 and magnet steel 102 by glue.

The magnetic steel is connected to the rotor yoke ring through the second group of bolts, so that the magnetic steel is convenient to mount, firm and high in precision, and the position of the magnetic steel cannot deviate when the motor runs. And the second group of bolts are arranged at the center of the magnetic steel, and the second group of bolts at the center have small influence on the effective magnetic field doing work when the motor runs, namely the second group of bolts have small interference on the magnetic field.

A gap can be formed between two adjacent magnetic steels in each row, the gap can be determined according to the specific application occasion of the motor and the requirement of electromagnetic design, and the gap can be filled by glue. Of course, according to the design requirement, there may be no gap between two adjacent magnetic steels in each row.

The invention does not limit the number of phases of the motor, the multi-phase stator module 201 can be three-phase, six-phase and the like, the number of the phases of the rotor is the same as that of the stator, and if the number of the phases is three-phase or six-phase, the number of the rows of the magnetic steel is three or six.

Preferably, the number of phases of the multi-phase stator module 201 and the rotor is three, the difference between the adjacent two-phase stator modules 201 is 120 degrees in electrical angle, that is, the difference between the central lines of the stator teeth of the phases a and B in the three-phase stator is 120 degrees in electrical angle, the phases B and C are the same, and the 120 degrees in electrical angle is realized by processing silicon steel sheets into different specification angles.

The side face of the rotor yoke ring 101 is provided with an end cover bolt hole 107 for fixing an end cover, and the outer surface of the rotor yoke ring 101 is used for installing a shell hub of the electric vehicle.

The material of the rotor yoke ring is not limited in the present invention as long as a certain magnetic permeability can be satisfied, and in one example, the material of the rotor yoke ring 101 is low carbon steel.

Embodiments of the present invention further provide a transverse-flux electric machine, as shown in fig. 2, including the aforementioned transverse-flux electric machine stator-rotor assembly. The transverse flux motor comprises the stator and rotor assembly, and the stator and rotor assembly has the same beneficial effects as the stator and rotor assembly, and the description is omitted here.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A transverse flux electric machine stator-rotor assembly comprising an outer rotor assembly and a stator assembly disposed inside said outer rotor assembly, wherein:

2. The transverse flux motor stator-rotor assembly according to claim 1, wherein the outer surface of the stator yoke ring is provided with an annular step protrusion, the outer surface of the stator yoke ring is provided with a positioning groove, the inner circle of the stator toothed plate is provided with an inward positioning protrusion, and the stator yoke ring is provided with an outlet.

3. The transverse flux motor stator-rotor assembly according to claim 2, wherein a first set of bolt holes are formed at the contact surface of the stator tooth plate and the stator yoke ring, each bolt hole of the first set of bolt holes comprises a first half hole on the stator tooth plate and a second half hole on the stator yoke ring, the central angle of the first half hole is greater than 180 °, and the central angle of the second half hole is smaller than 180 °.

4. The tfem stator/rotor assembly of claim 3, wherein adjacent stator modules are spaced apart from each other by a spacer, a spacer positioning groove is formed in the stator tooth plate at the first half hole, a spacer mounting groove is formed in the stator yoke ring at the second half hole, the spacer comprises a spacer body and a positioning plate perpendicular to the spacer body, the spacer body is disposed in the spacer mounting groove, and the positioning plate is disposed in the spacer positioning groove.

5. The transverse flux motor stator and rotor assembly according to claim 4, wherein insulating materials are arranged between the coil and the stator toothed plate and between the coil and the stator yoke ring, silicon steel sheets are laminated in a welding mode to form the stator toothed plate, and the stator toothed plate is provided with a slotted hole.

6. The tfem stator/rotor assembly of any one of claims 1-5, wherein a groove is formed in the outer surface of the rotor yoke ring at a position between two adjacent rows of magnetic steels, and a spacer washer made of a non-magnetic material is disposed on the inner surface of the rotor yoke ring at a position between two adjacent rows of magnetic steels.

7. The tfem stator/rotor assembly of claim 6, wherein a second set of bolt holes is formed in the center of the magnetic steel, the magnetic steel is fixed to the inner surface of the rotor yoke ring by the second set of bolts, and the spacer washer is fixed to the inner surface of the rotor yoke ring and the magnetic steel by glue.

8. The tfem stator/rotor assembly of claim 7, wherein adjacent two of the magnetic steels in each row have a gap or no gap therebetween, and the gap is filled with glue.

9. A tfem stator and rotor assembly as claimed in claim 8 wherein the multiphase stator modules are three phase, the rotor yoke ring is provided with end cap bolt holes on its sides for fixing end caps, and the outer surface of the rotor yoke ring is used for mounting a housing hub.

10. A transverse-flux electric machine comprising a transverse-flux electric machine stator-rotor assembly according to any one of claims 1-9.