CN108063532A - Double-stator structure two-phase doubly salient permanent magnet motor - Google Patents

Abstract

The invention discloses a two-phase double-salient pole permanent magnet motor with a double-stator structure. The technical problem to be solved is: for the current motor system mentioned in the background technology, there are generally large torque ripples, large voltage fluctuations, and high energy consumption. shortcoming. The technical solution adopted is: a two-phase double salient pole permanent magnet motor with double stator structure, including stator A, stator B, stator A salient pole, stator B salient pole, armature winding A, armature winding B, rotor A, Rotor B, permanent magnet ring and shaft. The salient poles of stator A and the salient poles of stator B are evenly distributed radially on the circumference of the stator. The salient poles of stator A are wound with armature winding A, and the salient poles of stator B are wound with armature winding B. Viewed from the end of the stator along the axial direction, Stator A and stator B are staggered by 45°. The permanent magnet ring is nested between the stator A and the stator B, and the permanent magnet ring is axially magnetized. Rotor A and rotor B have the same structure and are sleeved on the rotating shaft. The invention has the advantages of small iron loss with the same polarity of the magnetic circuit, high power density and high efficiency.

Description

A two-phase double salient pole permanent magnet motor with double stator structure

technical field

The invention relates to a motor, in particular to a double-stator structure two-phase double salient pole permanent magnet motor, which belongs to the technical field of motors.

Background technique

The doubly salient motor is a new structure motor proposed in the 1950s. It has received widespread attention and in-depth research since the 1990s. It has the advantages of simple and firm structure, convenient manufacture, reliable operation, and easy maintenance. It has a good application prospect in wind power generation occasions.

The double salient pole motor belongs to the variable reluctance motor, and the variable reluctance motor includes two types of unilateral salient pole and double salient pole. The polar motor has been favored by researchers more. A typical variable reluctance motor uses the unequal reluctance, and the magnetic flux always concentrates on the route with small reluctance. When working as a motor, the energized stator winding attracts the ferromagnetic rotor with magnetic force, so that the magnetic force generates a tangential component force, that is produces torque on the rotor. The energization sequence of the stator is energized according to the position of the rotor detected by the position sensor, which is most conducive to generating forward torque for the rotor. One phase is energized. The control system constantly changes the energized phase sequence of the stator winding, so that the rotor continues to rotate in one direction.

Variable reluctance motors include switched reluctance motors, stepper motors, and double salient pole motors, and double salient pole motors include permanent magnet double salient pole motors, electrically excited double salient pole motors, and flux reversal double salient pole motors. and flux switching doubly salient motors. A switched reluctance motor (SRM) is different from a stepper motor. It is a self-synchronous motor with position feedback, and its speed is determined by the drive torque of the motor and the resistance torque of the load. The stepper motor works in an open loop, and its speed is determined by the pulse frequency. The switched reluctance motor has a simple rotor structure. The rotor is made of laminated silicon steel sheets. There are no coils and magnetic steel on the rotor. It is suitable for working at high temperature and high speed. It has been researched in the field of aviation electrical, but the switched reluctance motor Always work with the power converter, making its power generation work complicated and unreliable.

In order to avoid potential failures caused by the disadvantages of switched reluctance motors during operation, researchers installed permanent magnets in the structure of switched reluctance motors to form a double salient permanent magnet motor (DSPM). When the pole arc length of the stator and rotor satisfies a certain relationship, the total air gap permeance of the doubly salient motor is a constant value. At this time, the working point of the permanent magnet will not change with the rotation of the rotor, so the doubly salient motor has no positioning torque at rest , the interlinkage flux on the doubly salient motor winding is only proportional to the permeance. Permanent magnets with high coercive force and low permeability are placed in the stator of the doubly salient motor, so the reluctance of the magnetic circuit of the doubly salient motor is large, and the winding inductance is small, so that the current commutation can be completed quickly. In addition, when the doubly salient motor works, the flux linkage and magnetomotive force generated by the armature reaction are much smaller than those generated by the permanent magnet, so the synthetic flux linkage is mainly determined by the permanent magnet. The armature reaction of the switched reluctance motor is completely determined by the armature current, and its winding current is much larger than that of the doubly salient permanent magnet motor, so the doubly salient permanent magnet motor generates less heat and noise when it works.

Contents of the invention

The technical problem to be solved by the present invention is: aiming at the disadvantages of large torque ripple, large voltage fluctuation and high energy consumption in the current motor system mentioned in the background technology.

The purpose of the invention is to propose a high-efficiency, novel-structure double-stator two-phase double-salient pole two-phase motor.

In order to solve the problems of the technologies described above, the technical scheme that the present invention takes is:

A two-phase double-salient pole permanent magnet motor with a double stator structure, including an annular stator A and an annular stator B installed coaxially, and a permanent magnet ring is fitted between the annular stator A and the annular stator B , the magnetization direction of the permanent magnet ring is axial magnetization;

On the inner ring surface of the annular stator A, four stator A salient poles are protruded outward along the length direction, and the four stator A salient poles are evenly distributed. The lengths of the four stator A salient poles are all equal and the four stator A salient poles are The lengths of the poles are all shorter than the length of the annular stator A; armature windings A are wound on the four salient poles of the stator A, and the two spaced apart armature windings A of the four armature windings A are forwardly connected in series. Then it is connected in reverse series with the other two armature windings A to form a phase;

On the inner ring surface of the annular stator B, four stator B salient poles are protruded outward along the length direction, and the four stator B salient poles are evenly distributed. The lengths of the four stator B salient poles are all equal and the four stator B salient poles are The length of the poles is less than the length of the annular stator B; the armature windings B are wound on the four salient poles of the stator B, and the two spaced apart armature windings B of the four armature windings B are connected in series in the forward direction. Then it is connected in reverse series with the other two armature windings B to form a phase;

A phase composed of four armature windings A and a phase composed of four armature windings B, the phase difference between the two phases is 90° electrical angle;

The four stator A salient poles in the annular stator A and the four stator B salient poles in the annular stator B are all staggered by 45°;

A ring-shaped rotor A is arranged inside the ring-shaped stator A, and six rotor salient poles A are arranged on the outer ring surface of the ring-shaped rotor A along the length direction. The length of the rotor salient pole A is equal to the length of the annular stator A and is equal to the length of the stator A salient pole;

A ring-shaped rotor B is arranged inside the ring-shaped stator B, and six rotor salient poles B are arranged protruding outward along the length direction on the outer ring surface of the ring-shaped rotor B, and the six rotor salient poles B are evenly arranged, and the six The length of the rotor salient pole B is equal to the length of the annular stator B and is equal to the length of the stator B salient pole;

Both the rotor A and the rotor B are installed on the rotating shaft.

In the permanent magnet motor of the present invention, the axially magnetized permanent magnet ring is embedded in the middle position of the annular stator A and the annular stator B to provide an excitation magnetic field for the motor; the armature winding A and the armature winding B are respectively wound on the stator On salient pole A and stator B salient pole, the electric load is connected to the motor when it is generating electricity, and the power supply is connected to the motor when it is electric.

In the permanent magnet motor of the present invention, among the four armature windings A, the two spaced windings are forwardly connected in series and then connected in anti-phase series with the other two two windings to form a phase; among the four armature windings B, the two spaced windings The forward series is connected with the two adjacent windings in anti-phase series to form a phase, and the whole motor has a total of two-phase windings. The forward series connection of the two windings and the antiphase series connection of the two windings mentioned in the technical solution of the present invention are conventional technologies in the field of the prior art.

In the permanent magnet motor of the present invention, viewed from the end of the stator along the axial direction, the stator A and the stator B are staggered by 45°. When the rotor salient poles of one motor are fully aligned with the stator salient poles, the rotor salient poles of the other motor are in the Half-aligned position.

As an improvement to the technical solution of the present invention, the cross sections of the four salient poles of the stator A and the four salient poles of the stator B are square. This technical feature is designed for the convenience of winding.

As an improvement to the technical solution of the present invention, the sections of the four salient poles of the stator A and the four salient poles of the stator B are rectangular. This technical feature is designed for uniform winding and easy winding.

As an improvement to the technical solution of the present invention, the rotating shaft is made of soft magnetic material.

Beneficial effect

The beneficial effect of the present invention compared with prior art:

1. The double-stator structure two-phase double-salient pole permanent magnet motor of the present invention adopts permanent magnets to establish an excitation magnetic field, which can reduce the copper consumption of the motor and improve the efficiency of the motor.

2. The two-phase double-salient pole permanent magnet motor with double stator structure of the present invention adopts the same polarity structure, and the motor has lower iron loss.

3. The double-stator structure two-phase double-salient pole permanent magnet motor of the present invention adopts a double-stator structure to reduce torque ripple and voltage fluctuation.

4. The double-stator structure two-phase double-salient pole permanent magnet motor of the present invention has the advantages of small iron loss of the same polarity of the magnetic circuit, high power density and high efficiency.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

FIG. 2 is a schematic structural view of the stator A. FIG.

FIG. 3 is a schematic structural view of the stator B. FIG.

FIG. 4 is a schematic diagram of the structure of the armature winding A.

FIG. 5 is a schematic structural view of the rotor A.

Figure 6 is a southwest isometric view of the present invention (rotary axis not shown).

Fig. 7 is a northeast isometric view of the present invention (the rotating shaft is not shown in the figure).

Detailed ways

In order to make the content of the present invention more comprehensible, further description will be made below in conjunction with accompanying drawings 1-7 and specific implementation methods.

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

As shown in Figure 1, the dual-stator structure two-phase double-salient pole permanent magnet motor of the present invention includes coaxially installed annular stator A1 and annular stator B3, and the annular stator A1 and annular stator B3 A permanent magnet ring 6 is fitted between them, and the magnetization direction of the permanent magnet ring 6 is axial magnetization.

The axially magnetized permanent magnet ring 6 is embedded in the middle of the ring-shaped stator A1 and the ring-shaped stator B3 to provide an excitation magnetic field for the motor; the armature winding A2 and the armature winding B4 are respectively wound on the salient poles of the stator A and the stator B On the salient pole, the motor is connected to the electric load when it is in power generation operation, and it is connected to the power supply when it is in electric operation.

As shown in Figures 2 and 4, four stator A salient poles 1-1 are arranged on the inner ring surface of the annular stator A1 along the length direction, and the four stator A salient poles 1-1 are evenly distributed, and the four The lengths of the stator A salient poles 1-1 are equal and the lengths of the four stator A salient poles 1-1 are all shorter than the length of the annular stator A1; armature windings are wound on the four stator A salient poles 1-1 A2, two spaced apart armature windings A2 of the four armature windings A2 are forwardly connected in series, and then connected in reverse series with the other two armature windings A2 to form a phase.

As shown in Figure 3, four stator B salient poles 3-1 are protruding outward along the length direction on the inner ring surface of the annular stator B3, and the four stator B salient poles 3-1 are evenly distributed. The lengths of the salient poles 3-1 are equal and the lengths of the four stator B salient poles 3-1 are all shorter than the length of the annular stator B3; the four stator B salient poles 3-1 are all wound with armature windings B4, Two spaced apart armature windings B4 of the four armature windings B4 are forwardly connected in series, and then reversely connected in series with the other two armature windings B4 to form a phase.

One phase constituted by four armature windings A2 and one phase constituted by four armature windings B4, the phase difference between these two phases is 90° electrical angle.

As shown in FIGS. 2 and 3 , the cross sections of the four stator A salient poles 1 - 1 and the four stator B salient poles 3 - 1 are rectangular.

As shown in Figures 1 and 5, a ring-shaped rotor A5 is arranged inside the ring-shaped stator A1, and six rotor salient poles A5-1 are arranged on the outer ring surface of the ring-shaped rotor A5 along the length direction. The rotor salient poles A5-1 are evenly distributed, and the lengths of the six rotor salient poles A5-1 are equal to the length of the annular stator A1 and the length of the stator A salient poles 1-1.

As shown in Figures 1 and 5, a ring-shaped rotor B is arranged inside the ring-shaped stator B3, and six rotor salient poles B are arranged on the outer ring surface of the ring-shaped rotor B along the length direction. The poles B are evenly distributed, and the lengths of the six rotor salient poles B are equal to the length of the annular stator B3 and the length of the stator B salient pole 3-1.

Both the rotor A5 and the rotor B are installed on the rotating shaft 7 . The rotating shaft 7 is made of soft magnetic material.

The magnetic circuit design of the permanent magnet motor of the present invention:

The paths through which the lines of force pass are permanent magnet ring N pole, stator A, stator A salient pole, air gap, rotor A, rotating shaft, rotor B, air gap, stator B salient pole, stator B, permanent magnet ring S pole. As shown in Figures 6 and 7, at the same moment, the positional relationship between stator A and stator B can be observed from different angles of view.

The working principle of the permanent magnet motor of the present invention:

When the present invention operates as a generator, the prime mover drives the rotating shaft and rotor A and rotor B to rotate. Due to the existence of salient poles on rotor A and rotor B, the rotation of rotor A and rotor B will cause the armature winding A and armature of the motor to rotate. The magnitude of the magnetic flux of winding B changes, so that electromotive force is induced in the motor armature winding A and armature winding B, and the magnitude of the induced electromotive force is related to the rotor speed.

When the present invention is used as a motor, according to the position of the rotor, the forward or reverse current can be passed into the two-phase winding composed of armature winding A and armature winding B to generate torque, and the two-phase current are out of phase by 90°.

The parts not involved in the present invention are all communicated with the prior art or implemented by adopting the prior art.

All that are not specifically described in the description of the present invention are existing technologies or can be realized through existing technologies. It should be understood that those skilled in the art can improve or transform according to the above description, and all these improvements All changes and transformations should belong to the scope of protection of the appended claims of the present invention.

Claims (4)

1. a kind of double-stator structure two-phase doubly salient permanent magnet motor, it is characterised in that：Including coaxial mounted circular stator A (1) and annular shape stator B (3) permanent-magnetic clamp (6), permanent-magnetic clamp, are fitted together between circular stator A (1) and annular shape stator B (3) (6) magnetizing direction is axial charging；

Evagination sets four stator A salient poles (1-1), four stator A along its length on the inner ring surface of circular stator A (1) Salient pole (1-1) is uniformly arranged, four stator A salient poles (1-1) be equal in length and the length of four stator A salient poles (1-1) is equal Less than the length of circular stator A (1)；Be wound with armature winding A (2) on four stator A salient poles (1-1), four armatures around The positive concatenation of two armature winding A (2) in group A (2) separately, afterwards again with another two armature winding A (2) differential concatenation structure Cheng Yixiang；

Evagination sets four stator B salient poles (3-1), four stator B along its length on the inner ring surface of circular stator B (3) Salient pole (3-1) is uniformly arranged, four stator B salient poles (3-1) be equal in length and the length of four stator B salient poles (3-1) is equal Less than the length of circular stator B (3)；Be wound with armature winding B (4) on four stator B salient poles (3-1), four armatures around The positive concatenation of two armature winding B (4) in group B (4) separately, reversely concatenates structure with another two armature winding B (4) again afterwards Cheng Yixiang；

The phase that the phase that four armature winding A (2) are formed is formed with four armature winding B (4), the phase difference between this two-phase For 90 ° of electrical angles；

Four stator A salient poles (1-1) in circular stator A (1) and four stator B salient poles (3- in annular shape stator B (3) 1) stagger 45 °；

Circular rotor A (5) is set in circular stator A (1), on the outer ring surface of circular rotor A (5) along its length Evagination sets six rotor with salient pole A (5-1), and six rotor with salient pole A (5-1) are uniformly arranged, the length of six rotor with salient pole A (5-1) Degree with the equal length of circular stator A (1) and with the equal length of stator A salient poles (1-1)；

Circular rotor B, the outer projection along its length on the outer ring surface of circular rotor B are set in circular stator B (3) Put six rotor with salient pole B, six rotor with salient pole B are uniformly arranged, the length of six rotor with salient pole B with circular stator B (3) Equal length and with the equal length of stator B salient poles (3-1)；

Rotor A (5) is installed in rotor B in shaft (7).

2. double-stator structure two-phase doubly salient permanent magnet motor as described in claim 1, it is characterised in that：Four stator A salient poles It is square with the section of four stator B salient poles (3-1).

3. double-stator structure two-phase doubly salient permanent magnet motor as described in claim 1, it is characterised in that：Four stator A salient poles With the rectangular cross-section of four stator B salient poles (3-1).

4. double-stator structure two-phase doubly salient permanent magnet motor as described in claim 1, it is characterised in that：Shaft (7) is using soft Magnetic material is made.