CN106169850A - Bipolarity electrical excitation transverse magnetic flux synchronous motor - Google Patents

Abstract

A kind of bipolarity electrical excitation transverse magnetic flux synchronous motor, including rotor core and m rotor case, every phase rotor unit comprises p rotor core and a rotor case, p rotor core is divided into, lower two-layer, every layer be respectively p/2 rotor core and each along even circumferential be distributed, m phase rotor unit is axially staggered altogether, stationary part includes stator core, Exciting Windings for Transverse Differential Protection, armature winding, stator casing, every phase stator unit comprises p stator core the most equally distributed, the opening of p stator core is all radially toward rotor, Exciting Windings for Transverse Differential Protection is wound in the iron core teeth of stator core, p stator core, 2p Exciting Windings for Transverse Differential Protection and an armature winding form a phase stator unit, m this unit identical axially aligned one-tenth m phase stator altogether.Present configuration is simple, and torque density and power density are higher, and cogging torque is little, in that context it may be convenient to realize weak-magnetic speed-regulating, and cost is relatively low, and efficiency when can improve electric machine speed regulation.

Description

Bipolar Electric Excited Transverse Flux Synchronous Motor

technical field

The invention relates to the technical field of transverse flux motors, specifically a bipolar motor with simple structure, high torque density and power density, easy realization of magnetic field-weakening speed regulation, low cost, and improved motor speed regulation efficiency Sexually excited transverse flux synchronous motor.

Background technique

In recent years, with the development of economy and society, the demand for electric motors in all walks of life has been increasing, and the continuous increase in the number of electric motors has led to an increase in energy consumption. Therefore, improving the efficiency of electric motors has become an important goal of electric motor research and manufacturing.

At present, the main way to improve the efficiency of motors is to use high-performance permanent magnet materials, but with the depletion of resources, the price of high-performance permanent magnet materials continues to rise, resulting in an increase in the cost of permanent magnet motors; at the same time, due to the use of permanent magnet materials for excitation, assembly It is more difficult, and more importantly, it is difficult to realize the speed regulation of field weakening of permanent magnet motors, which leads to the reduction of motor performance and the efficiency of occasions that require speed regulation operation.

In addition, the coil slots and iron core teeth of traditional motors are on the same plane, resulting in an irreconcilable competitive relationship between the tooth width and the slot width, and it is difficult to effectively increase the power density. For this reason, a transverse flux motor with a new structure has attracted the attention of many researchers, and it is of great significance to improve the torque density. The coil slots and core teeth of this type of motor are perpendicular to each other in space, so it can achieve a higher torque density than the radial flux motor, and because the phases are independent of each other (the so-called phase independence means that when one phase is running, the other Phase operation has no effect, that is, it does not affect the current input by another phase, induced electromotive force, etc.), which makes it more convenient to design multi-phase motors to achieve fault-tolerant redundant operation. It can be predicted that transverse flux motors will have promising application prospects in different fields, especially in occasions that require high torque density and high power density, such as electric vehicles and home appliances. However, it is worth mentioning that most of the transverse flux motors with existing structures use permanent magnet excitation and unipolar flux, which has the disadvantages of low stator space utilization, large cogging torque, high cost, and difficulty in speed regulation. This restricts the further application of transverse flux motors in many fields, especially in the occasions where speed regulation is required, and the motor efficiency is not high.

Contents of the invention

The technical problem to be solved by the present invention is to provide a dual motor with simple structure, high torque density and power density, small cogging torque, easy speed regulation, low cost, and can improve the efficiency of motor speed regulation. Polarity electrically excited transverse flux synchronous motor.

The technical solution of the present invention is to provide a bipolar electric excitation transverse flux permanent magnet synchronous motor with the following structure, which includes a rotor part and a stator part, wherein:

The rotor part includes m rotor shells and rotor cores attached to the rotor shells. Each phase rotor unit contains p rotor cores and a rotor shell. The p rotor cores are divided into upper and lower layers. There are p/2 rotor cores in each layer and they are evenly distributed along the circumference. The angle between the upper rotor core and the lower rotor core along the circumference is 360°/p. The p rotor cores and a rotor shell form a A phase rotor unit, a total of m identical units are arranged axially along the rotating shaft to form an m-phase rotor unit;

The stator part includes stator core, excitation winding, stator shell and armature winding. The stator unit of each phase contains p stator cores. The p stator cores are evenly distributed along the circumference. The openings of the p stator cores are all along the diameter facing the rotor, the field winding is wound on the upper and lower teeth of the stator core, the stator core is provided with armature slots, and the armature windings are wound in the armature slots of p stator cores at the same time, p stator cores, 2p field windings and an armature winding form a stator unit, a total of m identical units are arranged in the axial direction to form m-phase stators, and the m-phase stators are embedded in the stator shell, each stator iron The excitation magnetic field directions of the excitation windings wound on the two adjacent iron core teeth on the core and the lower core are the same, but the excitation magnetic field directions of the two adjacent excitation windings along the circumferential direction are opposite.

The present invention proposes a bipolar electric excitation transverse flux synchronous motor through finite element analysis and theoretical magnetic network method calculation. The advantages of this synchronous motor are as follows:

1. The rotor has no winding, while the armature winding and field winding adopt concentrated full-pitch winding, located on the stator, and the structure is relatively simple.

2. The present invention realizes the bipolarity of the armature winding magnetic flux through comprehensive matching of rotor, stator, double-layer symmetrical rotor core, stator core and field winding excitation direction, and its power density and torque density will be At present, the unipolar transverse flux motor is twice as large, and at the same power and torque value, it can be smaller in size and lower in cost than the unipolar transverse flux motor.

3. Due to the decoupling of the iron core teeth and the coil slot section, the motor structure design is more flexible compared with the traditional motor. The iron core flux density and the armature winding current density can be designed to be larger at the same time, so that the motor volume is reduced. Reduce costs.

4. Due to the use of electric excitation, it is convenient to realize the speed regulation of field weakening and improve the operating efficiency of the speed regulating motor

Preferably, in the bipolar electric excitation transverse flux synchronous motor according to the present invention, the angles between the rotor units of each phase in the same direction along the axial direction are 360°/(p×m), and the stator units of each phase There is no gap between them, and the stator core and the excitation windings with the same excitation direction on the stator core are aligned.

Preferably, in the dual-polarity electric excitation transverse flux synchronous motor of the present invention, the shape of the rotor core is "C", and the diameter of the circular arc of the teeth of the rotor core is the same as the outer diameter of the rotor core.

Description of drawings:

Fig. 1 is the three-dimensional structure schematic diagram of stator part and rotor part among the present invention;

Fig. 2 is the schematic diagram of the three-dimensional structure of the rotor part in the present invention;

Fig. 3 is a schematic diagram of a half-section structure of the stator part of the present invention;

Fig. 4 is a structural schematic diagram of the present invention when the field winding is wound on the upper and lower iron core teeth of the stator core;

Fig. 5 is a three-dimensional structural schematic diagram of a stator core;

Fig. 6 is a three-dimensional structural schematic diagram of a "C"-shaped rotor core in the present invention;

Fig. 7 is a schematic diagram of forming a bipolar magnetic flux path of the present invention;

FIG. 8 is a schematic diagram of forming another bipolar magnetic flux path according to the present invention.

Specific examples:

The bipolar electric excitation transverse flux synchronous motor of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

As shown in FIG. 1 and FIG. 2 , the bipolar electric excitation transverse flux synchronous motor of the present invention is a three-phase 8-pole bipolar electric excitation transverse flux synchronous motor, and the synchronous motor includes a rotor part 1 and a stator part 2 . The rotor part 1 comprises three mutually independent separated rotor housings 3-1, 3-2, 3-3 and 24 "C" shaped rotor cores 4 attached to the outer wall of the rotor housing, these "C" shaped The rotor core 4 belongs to three phases A, B, and C. Each phase has 8 "C" shaped rotor cores 4 and 1 rotor shell. The 8 "C" shaped rotor cores 4 are divided into upper and lower phases. Two layers, 4 in each layer, the "C" shaped rotor cores 4 in each layer are evenly distributed along the circumference, and the angle between the upper rotor core 4 and the adjacent lower rotor core 4 in the circumferential direction is 45° , as shown in Figure 2, the staggered angle between the rotor core 4-4 and the rotor core 4-5 and the staggered angle between the rotor core 4-5 and the rotor core 4-6 are both 45, while the same layer of rotor core 4 The staggered angle of adjacent "C" shaped rotor cores 4 is 90°, as shown in Fig. 2, the staggered angle of rotor core 4-4 and rotor core 4-6 is 90°. As shown in Figure 2, the rotor part 1 has three phases A, B, and C in total, and the rotor units of each phase are staggered in the same direction at the same interval along the axial direction, and the stagger angles are all 15°, as shown in Figure 2. As shown in cores 4-2, 4-3 and 4-5, that is, the staggered angle between rotor core 4-2 and 4-3 is 15°, and the staggered angle between rotor core 4-3 and 4-5 is also 15° .

As shown in FIGS. 1 and 3 , the stator part 2 includes a stator core 5 , an excitation winding 6 , a stator case 7 and an armature winding 8 . The stator unit of each phase includes 8 stator cores 5, which are evenly distributed along the circumference, and the openings 9 of each stator core 5, as shown in Figure 1 and Figure 5, are all oriented radially rotor, and two field windings 6 are respectively wound on the upper and lower iron core teeth 10 of each stator core 5, as shown in FIG. 4 . As shown in FIG. 5 , the iron core teeth 10 are in an "h" shape, and the upper and lower iron core teeth 10 are anti-symmetrically distributed. There is no gap between the stator units of each phase, as shown in Figure 3, 5-1, 5-2 and 5-3 respectively represent a stator core 5 of each phase, and the stator cores 5-1, 5-2 and 5 -3 is on the same axis, and 8-1, 8-2, 8-3 represent the three-phase armature winding 8, the excitation winding wound on the upper and lower two iron core teeth 10 of each stator core 5 The direction of the magnetic field generated by 6 is the same, but the direction of the magnetic field generated by the adjacent excitation winding 6 distributed along the circumferential direction is opposite, as shown in Figure 3, the magnetic field generated by the excitation winding 6-1 and 6-3, 6-2 and 6-4 The directions are opposite, and the directions of the magnetic fields generated by the exciting windings 6-1 and 6-2, 6-3 and 6-4 are the same. As shown in Figure 1, corresponding to the rotor part 1, the stator part 2 is also three-phase, 8 stator cores, 16 field windings 6 and 1 armature winding 8 constitute a phase unit, a total of three identical units along the Axially arranged at the same interval to form a three-phase stator, they are aligned axially and embedded in the stator shell 7 .

In the present invention, the two electric excitation bipolar magnetic flux paths are shown in Fig. 7 and Fig. 8. In Fig. 7, the magnetic flux follows the magnetic field N pole-air gap 12-1 generated after the excitation winding 6-1 is energized. —Rotor core 4-1—Air gap 12-2—Stator core 5—The S pole of the magnetic field generated by the excitation winding 6-1 after electrification forms a magnetic flux circuit 13 . In Fig. 8, the magnetic flux follows the magnetic field N pole generated after electrification of the excitation winding 6-2 in turn—air gap 14-2—rotor core 4-2—air gap 14-1—stator core 5—excitation winding 6 -2 The S pole of the magnetic field generated after electrification forms a magnetic flux loop 15 . It can be seen from Fig. 7 and Fig. 8 that as the rotor rotates, the rotor core opposite to the stator changes alternately at 4-1 and 4-2, so that the magnetic flux of the 8-turn chain of the armature winding in the armature slot 16 presents a double polarity.

As shown in FIG. 6 , the shape of the rotor core 4 is "C", and the diameter of the arc of the teeth of the rotor core 4 is the same as the outer diameter of the rotor core 4 . The rotor core 4 can be formed by pressing powder soft magnetic composite material, or can be formed by laminating and cutting silicon steel sheets.

As shown in FIG. 5 , the stator core 5 can be formed by pressing powder soft magnetic composite materials, or can be formed by laminating and cutting silicon steel sheets.

In the case of Figure 7, the field winding wound on the upper core teeth of the stator core shown in Figure 5 is energized to generate a magnetic field, while the field winding wound on the lower core teeth of the stator core shown in Figure 5 The excitation winding may not be energized; in the case of Figure 8, the excitation winding wound on the lower core teeth of the stator core shown in Figure 5 is energized to generate a magnetic field, while the upper iron core of the stator core shown in Figure 5 The field winding wound on the core teeth may not be energized.

The bipolar electric excitation transverse flux synchronous motor proposed by the present invention is analyzed through equivalent magnetic network method theory and three-dimensional modeling analysis of finite element software, and it passes stator, rotor, double-layer symmetrical rotor core and stator core The comprehensive matching realizes the bipolarity of the magnetic flux. Its power density is twice that of the current unipolar transverse flux motor, and the power density is high.

The operating principle of the present invention is: when the bipolar electric excitation transverse flux synchronous motor works, it follows the "minimum reluctance principle", that is, the magnetic flux always closes along the path with the smallest reluctance, and the electromagnetic flux of reluctance property is generated due to the distortion of the magnetic force line. Torque, dragging the motor to produce rotational motion. Specifically, when the number of motor phases m=3, after generating the corresponding exciting magnetic field, it is assumed that after the sinusoidal alternating current is passed into the first phase stator winding of the present invention, the phase stator core and the rotor "C" If the rotor core is aligned, then after the sinusoidal alternating current is passed into the next phase, since the three-phase rotor units are sequentially staggered by 15°, the twist of the magnetic flux generated by the sinusoidal alternating current in the second phase stator winding will be Forming the electromagnetic torque of reluctance property, it will drive the motor rotor to rotate 120° electrical angle, so that the stator core of the second phase is aligned with the "C" rotor core of the rotor. Similarly, the electromagnetic torque generated by the third phase will Drag the rotor to rotate 120° electrical angle, so that the stator core of the third phase is aligned with the "C" rotor core of the rotor, so that the three-phase windings are sequentially arranged according to the first phase → the second phase → the third phase → the first phase... Continuous energization can make the outer rotor of the motor produce continuous rotational motion.

The above-mentioned embodiments are only descriptions of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. All such modifications and improvements should fall within the scope of protection defined by the claims of the present invention.

Claims (3)

1. a bipolarity electrical excitation transverse magnetic flux synchronous motor, it includes rotor portion (1) and stationary part (2), and it is special Levy and be:

Rotor portion (1) includes m rotor case and the rotor core (4) being affixed on rotor case, and every phase rotor unit comprises p Individual rotor core (4) and a rotor case, p rotor core (4) is divided into upper and lower two-layer, and every layer is respectively p/2 rotor core (4) and each along even circumferential being distributed, the angle that upper strata rotor core and lower floor's rotor core circumferentially stagger is 360 °/p, p Individual rotor core (4) and a rotor case form a phase rotor unit, and m this unit identical is axially arranged along rotating shaft (11) altogether Arrange into m phase rotor unit；

Stationary part (2) includes stator core (5), Exciting Windings for Transverse Differential Protection (6), stator casing (7) and armature winding (8), every phase stator Unit comprises p stator core (5), and p stator core (5) is circumferentially uniformly distributed, the peristome of p stator core (5) Position (9) is all radially toward rotor, and described Exciting Windings for Transverse Differential Protection (6) is wound on upper and lower two iron core teeth (10) of stator core (5), Described stator core (5) is provided with armature slot (17), and described armature winding (8) is wound on the armature of p stator core (5) simultaneously In groove (17), p stator core (5), 2p Exciting Windings for Transverse Differential Protection (6) and an armature winding (8) form a phase stator unit, altogether M this unit identical axially aligned one-tenth m phase stator, m phase stator embeds on stator casing (7), each stator core (5) The excitation field direction of the Exciting Windings for Transverse Differential Protection (6) of the upper coiling of upper and lower two adjacent iron core teeth (10) is identical, but along the circumferential direction The excitation field of two adjacent Exciting Windings for Transverse Differential Protection (6) is in opposite direction.

Bipolarity electrical excitation transverse magnetic flux synchronous motor the most according to claim 1, it is characterised in that: each phase rotor list Between unit the most equidirectional angle that staggers be 360 °/(p × m), not offset angular, stator between each phase stator unit Iron core (5) and stator core (5) Exciting Windings for Transverse Differential Protection (6) that above excitation direction is identical all alignment.

Bipolarity electrical excitation transverse magnetic flux synchronous motor the most according to claim 1 and 2, it is characterised in that: described turn The shape of sub-iron core (4) is in " C " shape, and rotor core (4) teeth portion arc diameter is as the external diameter of rotor core (4).