CN209930114U

CN209930114U - Stator permanent magnet type bipolar magnet gathering type transverse flux permanent magnet synchronous motor

Info

Publication number: CN209930114U
Application number: CN201920460310.XU
Authority: CN
Inventors: 孙强
Original assignee: Hefei College
Current assignee: Hefei University; Hefei College
Priority date: 2019-04-08
Filing date: 2019-04-08
Publication date: 2020-01-10
Anticipated expiration: 2029-04-08

Abstract

The utility model discloses a bipolar magnetic gathering formula transverse flux permanent magnet synchronous motor of stator permanent magnetism type can solve the technical problem that current transverse flux motor stator space utilization is low, permanent magnet material utilization is low, the tooth's socket torque is higher. The rotor part comprises a rotor supporting body, a rotor iron core and a rotor shaft, and the rotor iron core is embedded into the outer surface of the rotor supporting body; each phase rotor unit comprises p rotor cores which are uniformly distributed along the circumference in the shape of an isosceles triangular wave, the p rotor cores and 1 rotor support body form one phase rotor unit, and m identical units are axially arranged into m phase rotor units; the stator part comprises a stator iron core, a permanent magnet, a coil winding and a base shell; each phase of stator unit comprises p stator cores, p permanent magnets and 1 winding, and m same units are arranged into m phase of stator units along the axial direction; the utility model discloses simple structure, torque density and power density are higher, and the tooth's socket torque is little, and permanent magnet material obtains make full use of, the sexual valence relative altitude.

Description

Stator permanent magnet type bipolar magnet gathering type transverse flux permanent magnet synchronous motor

Technical Field

The utility model relates to a transverse flux permanent-magnet machine technical field, concretely relates to bipolar magnetic gathering formula transverse flux permanent-magnet synchronous machine of stator permanent-magnet type.

Background

Since the first electric machine was born in the world, the electric machine industry has experienced a history of development for nearly two hundred years. In the two hundred years, along with the development of social economy and scientific technology, no matter in different fields such as industrial and agricultural production, aerospace, national defense, transportation, household appliances and the like, the figure of the motor is ubiquitous, and along with the improvement of science and technology and the enhancement of environmental awareness of people, the application range of the motor is increasingly expanded, for example, an automobile using an engine is replaced by an automobile using the motor, and a ship mechanically propelled by various combined power devices is replaced by a ship propelled by full power.

In China, along with the rapid development of national economy, the energy supply is already in a relatively short stage for a long time, and the contradiction needs to be solved, except for adopting and developing new available energy and increasing the power generation capacity, new energy-saving equipment is developed, and the utilization rate of the energy is improved. As a widely used electric device-motor in industrial enterprises and civil industries in China, the electricity consumption accounts for more than 80% of the total annual electricity generation amount according to statistics, therefore, the efficiency of the motor is further improved, the motor has the characteristics of higher torque density, power density and the like, the contradiction of relative shortage of energy supply in the economic development process can be greatly relieved, and the purposes of energy conservation and environmental protection are further realized, so that the electric device-motor research personnel in various countries continuously strive. However, in the conventional radial and axial flux motor, because the tooth grooves are positioned on the same plane and limited by the temperature rise of the motor, the cross section of the winding groove and the cross section of the flux teeth of the motor are restricted with each other, so that the performance of the motor is difficult to effectively improve.

In the 20 th century, in the 80 th century, the professor Herbert Weh of Brunswick physic university, germany, proposed a Transverse Flux Motor (TFM), in which the coil slots and the core teeth of the Motor are perpendicular to each other in space, so as to achieve decoupling of electrical load and magnetic load, avoid the mutual competition of the tooth slot cross sections of the conventional radial Motor and axial Motor, and have a very high degree of freedom in adjusting the coil cross section area and the magnetic circuit size, thereby achieving higher power density and torque density than the conventional Motor, and in addition, because the phases are independent from each other (the so-called mutual independence between phases means that when one phase operates, there is no influence on the operation of other phases, i.e., the current, induced electromotive force, etc. input by the other phase are not influenced), it is more convenient to design a multi-phase Motor to achieve fault-tolerant redundant operation. It is foreseen that: the transverse flux motor has wide application prospect. However, it is worth mentioning: the transverse flux permanent magnet motor with the existing structure mostly belongs to unipolar flux, the space utilization rate of a stator is low, the defects of large cogging torque, high cost and the like exist, even if bipolar flux is realized, only half of permanent magnet materials are utilized, the cost of the motor is increased, the cost performance is low, and the further application of the transverse flux permanent magnet motor in the fields of industrial and agricultural production, aerospace, national defense, transportation, new energy automobiles and household appliances is greatly limited.

SUMMERY OF THE UTILITY MODEL

The utility model provides a bipolar magnetic formula transverse flux permanent magnet synchronous machine that gathers of stator permanent magnetism type can solve current transverse flux motor and belong to unipolar magnetic flux more, and stator space utilization is low, and tooth's socket torque is big, the higher technical problem of cost.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a stator permanent magnet type bipolar magnet gathering type transverse flux permanent magnet synchronous motor comprises a rotor part and a stator part, wherein:

the rotor part comprises a rotor supporting body, and a rotor core and a rotor shaft which are embedded into the outer surface of the rotor supporting body, each phase of rotor unit comprises p rotor cores (p is an even number), the p rotor cores are uniformly distributed along the circumference in the shape of an isosceles triangular wave, the p rotor cores and 1 supporting body form one phase of rotor unit, and the total m same units are axially arranged into m phase of rotor units;

the stator part comprises stator cores, permanent magnets, coil windings and a base shell, each phase of stator unit comprises p stator cores, the p stator cores are uniformly distributed along the circumference, the opening parts of the p stator cores face the rotor along the radial direction, the permanent magnets are positioned between two adjacent stator core yokes along the circumference, p permanent magnets are totally magnetized in the circumferential tangential direction, the magnetizing directions of the two adjacent permanent magnets are opposite, the p stator cores, the p permanent magnets and the 1 coil winding form one phase of stator unit, the total m same units are arranged into m-phase stators along the axial direction, and the m-phase stators are embedded on the base shell.

For further explanation:

the bipolar magnetic flux formula transverse flux permanent magnet synchronous motor that gathers of stator permanent magnetism type, wherein, along the axial angle that staggers in proper order the equidirectional between each phase rotor unit be 360 (p x m), the angle that does not stagger between each phase stator unit, the same permanent magnet of polarity all aligns the range between stator core and the stator core that constitutes stator unit promptly.

The bipolar magnetic flux formula transverse flux permanent magnet synchronous motor that gathers of stator permanent magnetism type, wherein, along the axial between each phase stator unit in proper order equidirectional staggered angle be 360 (p x m), constitute stator unit's stator core and stator core promptly and go up the same permanent magnet of polarity and be 360 (p x m) along the axial in proper order equidirectional staggered angle, and the angle that does not stagger between each phase rotor unit, all align and arrange.

Stator permanent magnetism type bipolar magnetic gathering type transverse flux permanent magnet synchronous motor, wherein look along the circumferencial direction, the stator core shape is "C" shape, stator core tooth portion circular arc diameter is the same with stator core's internal diameter.

The utility model discloses a bipolar transverse flux PMSM, wherein, the shape of permanent magnet is rectangle.

Bipolar transverse flux PMSM, wherein, the whole shape of rotor core is isosceles triangle wave form, rotor core tooth portion circular arc diameter is the same with rotor core's external diameter.

According to the above technical scheme, the utility model discloses a finite element analysis calculates with theoretical magnetic network method, has provided bipolar transverse flux permanent magnet synchronous machine, simple structure, and torque density and power density are higher, and the tooth's socket torque is little, and permanent magnet material obtains make full use of, is the bipolar magnetic flux of gathering of stator permanent magnetism type permanent magnet synchronous machine that a cost performance is high.

Compared with the prior art, bipolar transverse flux permanent magnet synchronous motor's advantage as follows:

1. the stator permanent magnet technology is adopted, the rotor has no winding, the stator winding adopts a concentrated full pitch winding, and the structure is relatively simple.

2. The utility model discloses a rotor, the stator, isosceles triangle wave shape's rotor core and stator core's synthesis matches for the magnetic flux that whole permanent magnet material produced in the motor operation process can both play a role, both realized the bipolarity of magnetic flux, its power density and torque density will be the twice that adopts unipolar transverse flux motor at present, can be under same power and torque value again, than unipolar transverse flux motor and current bipolar transverse flux motor small, and is with low costs, and the price/performance ratio is higher.

3. Because the iron core teeth and the sections of the coil grooves are decoupled, compared with the traditional motor, the motor has more flexible structural design, and the torque density and the power density can be further improved through optimized design;

4. because of the adoption of the stator permanent magnet technology, the permanent magnet and the winding are both positioned on the outer stator, which is beneficial to heat dissipation, so that the magnetic density of the iron core and the current density of the winding can be designed to be larger simultaneously, the volume of the motor can be reduced, and the cost is reduced.

Drawings

Fig. 1 is a schematic perspective view of a stator part and a rotor part according to an embodiment of the present invention;

fig. 2 is a schematic perspective view of a rotor part according to an embodiment of the present invention;

fig. 3 is a schematic cross-sectional three-dimensional structure diagram of a stator part including a winding according to an embodiment of the present invention;

fig. 4 is a schematic cross-sectional three-dimensional structure diagram of a stator part without a winding according to an embodiment of the present invention;

fig. 5 is a schematic perspective view of a "C" shaped stator core according to a first embodiment of the present invention;

FIG. 6 is a left side view of FIG. 5;

FIG. 7 is a top view of FIG. 5;

fig. 8 is a schematic perspective view of a permanent magnet according to a first embodiment of the present invention;

fig. 9 is a schematic diagram illustrating a bipolar magnetic flux path according to a first embodiment of the present invention;

fig. 10 is a schematic diagram illustrating another bipolar magnetic flux path according to a first embodiment of the present invention;

fig. 11 is a schematic perspective view of a rotor core component according to an embodiment of the present invention;

fig. 12 is a schematic perspective view of a single silicon steel sheet constituting a rotor core component according to a first embodiment of the present invention;

fig. 13 is a schematic perspective view of an initial rotor core component according to a first embodiment of the present invention;

fig. 14 is a schematic perspective view of a rotor support according to an embodiment of the present invention;

fig. 15 is a schematic perspective view of a stator part and a rotor part in a second embodiment of the present invention;

fig. 16 is a cross-sectional view of a stator portion according to a second embodiment of the present invention;

fig. 17 is an arrangement diagram of a rotor portion according to a second embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.

Example one

As shown in fig. 1 and fig. 2, a bipolar transverse flux permanent magnet synchronous motor according to a first embodiment of the present invention is a three-phase 10-pole stator permanent magnet type bipolar flux-concentrating transverse flux permanent magnet synchronous motor, which includes a rotor portion 1 and a stator portion 2.

The rotor comprises a rotor supporting body 3, a rotor iron core 4 and a rotor shaft 5, wherein the rotor iron core 4 is embedded into the outer surface of the rotor supporting body 3, and the rotor supporting body 3 is fixed on the rotor shaft 5;

the rotor cores 4 belong to A, B, C three phases, the rotor cores 4 of each phase are uniformly distributed along the circumference in the shape of an isosceles triangle wave, the rotor cores 4 of each phase form 10 isosceles triangles, and two adjacent rotor cores form two sides of the isosceles triangle wave, as shown in fig. 2, namely, a rotor core 4-1 and a rotor core 4-2. As shown in fig. 2, the rotor portion 1 has A, B, C three phases in total, the rotor units of each phase are staggered in the same direction at the same interval in sequence along the axial direction, and the stagger angle is 12 °, as shown by the rotor cores 4-2, 4-3 and 4-4 in fig. 2, namely the stagger angle of the rotor cores 4-2 and 4-3 is 12 °, and the stagger angle of the rotor cores 4-3 and 4-4 is 12 °.

As shown in fig. 1 and fig. 3 and 4, the stator portion 2 includes a stator core 6, a permanent magnet 7, a coil winding 8, and a base housing 9. Each phase stator unit includes 10 "C" shaped stator cores 6, the 10 "C" shaped stator cores 6 are evenly distributed along the circumference, and the opening portion 10 of each "C" shaped stator core 6 is directed toward the rotor in the radial direction, as shown in fig. 5. The permanent magnets 7 are circumferentially located between two adjacent "C" -shaped stator core yokes 11, and the contact area of each permanent magnet 7 with the core yoke 11 is the same as the area of the circumferential surface 12 of the permanent magnet 7 as shown in fig. 8. As shown in fig. 8, the individual shape of the permanent magnet 7 may be rectangular, circumferential tangential magnetization and circumferential arrangement are adopted, the stator units of each phase are not staggered in angle, the "C" shaped stator core 6 and the permanent magnets 7 with the same polarity between the "C" shaped stator cores 6 are aligned, as shown in fig. 3 and 4, 6-1, 6-2 and 6-3 respectively represent a "C" shaped stator core 6 of each phase, the "C" shaped stator cores 6-1, 6-2 and 6-3 are in the same axial direction, 7-1, 7-2 and 7-3 respectively represent a permanent magnet 7 of each phase, the permanent magnets 7-1, 7-2 and 7-3 are in the same axial direction, and 8-1, 8-2 and 8-3 represent three-phase coil windings 8, each phase permanent magnet 7 is magnetized in circumferential tangential direction, however, the magnetizing directions of the adjacent permanent magnets 7 distributed along the circumferential direction are opposite, for example, the magnetizing directions of the permanent magnets 7-1, 7-4 and 7-7 are the same, the magnetizing directions of the permanent magnets 7-5, 7-6 and 7-8 are the same, but the magnetizing directions of the two groups of permanent magnets 7-1, 7-4 and 7-7 and 7-5, 7-6 and 7-8 are opposite, as shown in fig. 9 and 10. As shown in fig. 1, the stator portion 2 is also three-phase corresponding to the

rotor portion

1, and 10 "C"

shaped stator cores

6, 10

permanent magnets

7 and 1 coil winding 8 constitute one-phase unit, and a total of three identical units are arranged at equal intervals in the axial direction to form a three-phase stator, which are axially aligned and fixed to the stator frame housing 9.

In the first embodiment, two bipolar flux paths in the present invention are shown in fig. 9 and fig. 10, and in fig. 9, the flux follows the N-pole of the permanent magnet 7-1 (or 7-6) -the stator core 6-1-the air gap 13-1-the rotor core 4-the air gap 13-3 (or 13-2) -the stator core 6-4 (or 6-5) -the S-pole of the permanent magnet 7-1 (or 7-6) in sequence to form the flux loop 14-1 (or 14-2). In fig. 10, the magnetic flux forms a magnetic flux loop 16-1 (or 16-2) along the N-pole of the permanent magnet 7-1 (or 7-6) -the air gap 15-1-the rotor core 4-the air gap 15-3 (or 15-2) -the stator core 6-4 (or 6-5) -the S-pole of the permanent magnet 7-1 (or 7-6) in sequence. As can be seen from fig. 9 and 10, as the rotor rotates, the magnetic flux of the coil windings 8 in the coil slots 17 formed by the stator core 6 and the permanent magnets 7 appears bipolar.

It can also be seen from fig. 9 and 10 that, no matter where the rotor 1 is located, the permanent magnet flux linkage emitted by all the permanent magnets 7 can be the turn-linkage coil winding 8, so the utilization rate of the permanent magnet material is high, therefore, the utility model discloses both realized the bipolarity of magnetic flux, its power density and torque density will be twice that of adopting unipolar transverse flux motor at present, can be under same power and torque value again, smaller than unipolar transverse flux motor and existing bipolar transverse flux motor, with low costs, the price/performance ratio is higher.

In the first embodiment, as shown in fig. 2, 9 and 10, the rotor core 4 has an isosceles triangular waveform as a whole, and the rotor core component 4-a shown in fig. 11 may be spliced together as the edge of the isosceles triangular waveform. The rotor core component 4-a may be formed by laminating, bonding and molding rectangular silicon steel sheets 4-b as shown in fig. 12, and then cutting the rectangular silicon steel sheets to form a splicing surface 18, and then forming an initial rotor core component 4-c as shown in fig. 13; the initial rotor core component 4-c is then inserted into the milled slot 19 of the rotor support 3, and the rotor core 4 is formed by cutting the surface of the initial rotor core component 4-c facing the air gap between the stator and the rotor so that the outer diameter of the rotor core 4 is the same as the outer diameter of the rotor support 3, as shown in fig. 2 and 14.

In the first embodiment, as shown in fig. 2, 9 and 10, the rotor core 4 has a skewed slot feature while realizing the bipolar magnetic flux, so that the cogging torque can be effectively reduced, and the torque ripple can be reduced.

In the first embodiment, as shown in fig. 5, 6 and 7, the stator core 6 is in a C shape, the stator core 6 may be formed by laminating and bonding stator silicon steel sheets in the shape shown in fig. 7, an opening portion 10 is formed by cutting after the lamination and bonding, the opening portion is also a coil slot 17 for placing a coil, and the circular arc diameter of the tooth portion 20 of the stator core 6 and the inner diameter R of the stator₁As shown in fig. 7.

The utility model provides a bipolar transverse flux permanent magnet synchronous machine of stator permanent magnetism type passes through equivalent magnetism network method theoretical analysis and finite element software three-dimensional modeling analysis, and it matches through stator core, adjacent permanent magnet, the rotor core of triangle wave form that magnetizes opposite direction, has realized the bipolarity of magnetic flow, and its power density will be the twice that adopts unipolar transverse flux motor at present, realizes the high torque high power density design of transverse flux motor.

The utility model discloses an operation principle is: when the stator permanent magnet type bipolar transverse flux permanent magnet synchronous motor works, the magnetic resistance minimum principle is followed, namely, magnetic flux always needs to be closed along a path with the minimum magnetic resistance, and magnetic force lines are twisted to generate electromagnetic torque with the magnetic resistance property so as to drag the motor to generate rotary motion. Specifically, when the number m of motor phases is 3, assuming that the stator C-shaped stator core tooth 20 of the first phase of the stator winding of the present invention is aligned with the top of the rotor core triangle waveform after the sinusoidal alternating current is applied to the stator winding of the first phase, after the sinusoidal alternating current is applied to the next phase adjacent to the first phase, the three-phase rotor unit is sequentially staggered by 12 °, so that the magnetic flux line distortion generated by the sinusoidal alternating current applied to the stator winding of the second phase will form the electromagnetic torque of magnetic resistance property, which will drag the rotor of the motor to rotate by 120 electrical degrees, and the stator core tooth 20 of the second phase will be aligned with the top of the rotor core triangle waveform, and similarly, the electromagnetic torque generated by the third phase will drag the rotor to rotate by 120 electrical degrees, and the stator core tooth 20 of the third phase will be aligned with the top of the rotor core triangle waveform, and thus the three-phase winding will be continuously energized sequentially according to the first phase → the second phase → the first phase …, it is possible to produce a continuous rotational movement of the outer rotor of the motor.

Example two:

as shown in fig. 15, 16 and 17, in the first comparative embodiment, the difference of the second embodiment of the present invention is mainly embodied in that the three-phase stator units are sequentially staggered by 12 ° in the same direction along the axial direction, that is, the stator core 6 and the permanent magnet 7 of each phase are also sequentially staggered by 12 ° in the same direction, and the rotor units of each phase are not staggered by 12 ° in the same direction, and are all aligned. As shown in fig. 16, the phase B stator is offset by 12 ° compared to the phase a stator as a whole, and the phase C stator is offset by 12 ° compared to the phase B stator as a whole, that is, by 24 ° compared to the phase a stator as a whole.

Like the first embodiment, the 10 "C" shaped stator cores 6 and the 10 permanent magnets 7 in each phase are still distributed in a staggered manner and uniformly arranged along the circumferential direction, all the permanent magnets 7 are magnetized tangentially along the circumference, but the magnetizing directions of the two adjacent permanent magnets 7 are opposite, as shown in fig. 16.

Since other structures, magnetic flux forming paths and operation principles in the second embodiment are the same as those in the first embodiment, they are not described again.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. The utility model provides a bipolar magnetic-gathering type transverse flux permanent magnet synchronous motor of stator permanent magnet type, includes rotor part (1) and stator part (2), its characterized in that:

the rotor part (1) comprises a rotor supporting body (3), a rotor iron core (4) and a rotor shaft (5), the rotor iron core (4) is embedded into the outer surface of the rotor supporting body (3), and the rotor supporting body (3) is fixed on the rotor shaft (5);

the rotor cores (4) belong to A, B, C three phases respectively, each phase of rotor unit comprises p rotor cores (4), p is an even number, the p rotor cores (4) are uniformly distributed along the circumference in the shape of an isosceles triangular wave, the p rotor cores (4) form a phase of rotor unit, and m identical rotor units are arranged into m phase of rotor units along the axial direction;

the stator part (2) comprises a stator iron core (6), a permanent magnet (7), a coil winding (8) and a base shell (9);

each phase of stator unit comprises p stator cores (6), the p stator cores (6) are uniformly distributed along the circumference, opening parts (10) of the p stator cores (6) face the rotor part (1) along the radial direction, the permanent magnets (7) are located between two adjacent stator core yokes (11) along the circumference, p permanent magnets (7) are used in total, the magnetization directions of the two adjacent permanent magnets (7) are opposite, and the circumferential tangential magnetization is realized;

p stator cores (6), p permanent magnets (7) and 1 coil winding (8) form a phase stator unit, m phases of the unit are arranged into an m-phase stator along the axial direction, the m-phase stator is embedded on a base shell (9), and the base shell (9) is made of non-magnetic materials.

2. The stator permanent magnet type bipolar flux gathering transverse flux permanent magnet synchronous motor according to claim 1, characterized in that: the rotor part (1) is m-phase, rotor units of each phase are staggered in the same direction at the same interval along the axial direction, and the staggered angle is 360 degrees/(p x m);

the stator units of each phase are not staggered in angle, namely, the stator cores (6) and the permanent magnets (7) with the same magnetizing direction between the stator cores (6) are aligned.

3. The stator permanent magnet type bipolar flux gathering transverse flux permanent magnet synchronous motor according to claim 1, characterized in that: the stator part (2) is m-phase, the stator units of each phase are staggered in the same direction along the axial direction by 360 degrees/(p x m), namely the stator core (6) and the permanent magnets (7) with the same polarity between the stator core (6) are also staggered in the same direction by 360 degrees/(p x m), and the rotor units of each phase are not staggered by angle and are all aligned.

4. The stator permanent magnet type bipolar flux gathering transverse flux permanent magnet synchronous motor according to claim 1, 2 or 3, characterized in that: the stator core (6) is in a C shape along the axial direction, and the arc diameter of the tooth part of the stator core (6) is the same as the inner diameter of the stator core (6).

5. The stator permanent magnet type bipolar flux gathering transverse flux permanent magnet synchronous motor according to claim 1, 2 or 3, characterized in that: the permanent magnets (7) are rectangular in shape and are magnetized in the circumferential direction, and the magnetizing directions of the two adjacent permanent magnets (7) are opposite.

6. The stator permanent magnet type bipolar flux gathering transverse flux permanent magnet synchronous motor according to claim 1, 2 or 3, characterized in that: the rotor cores (4) are uniformly distributed along the circumference, the whole rotor cores are in an isosceles triangular wave shape, and the diameter of the circular arc of the tooth part of each rotor core (4) is the same as the outer diameter of each rotor core (4).

7. The stator permanent magnet type bipolar flux gathering transverse flux permanent magnet synchronous motor according to claim 4, wherein: the permanent magnets (7) are circumferentially positioned between two adjacent C-shaped stator core yokes (11), and the contact area of the contact part of each permanent magnet (7) and each stator core yoke (11) is the same as the surface area of the permanent magnet (7) in the circumferential direction.