CN108448755A - Axial magnetic flux two-phase electro-magnetic doubly salient motor - Google Patents

Abstract

The invention discloses an axial magnetic flux two-phase electric excitation double salient pole motor. The technical solution adopted in the invention includes a stator sleeve, a stator disc A, a stator salient pole A, an armature winding A, an excitation winding, Armature winding B, stator salient pole B, stator disk B, rotating shaft and rotor core; Among them, stator disk A and stator disk B are set inside the stator sleeve, and stator disk A is evenly distributed on the surface facing the rotor There are stator salient poles A, stator disc B is evenly distributed on the surface facing the rotor, stator salient poles B are evenly distributed, armature winding A is wound on stator salient pole A, armature winding B is wound on stator salient pole B, stator salient pole A is aligned with stator salient pole B. The invention has the beneficial effects of high efficiency, high power density, adjustable excitation magnetic field, stable output voltage and compact structure.

Description

An Axial Flux Two-Phase Electrically Excited Doubly Salient Motor

technical field

The invention belongs to the technical field of motors, and relates to an axial magnetic flux two-phase electric excitation double salient pole motor.

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 electrically excited double salient pole motors, permanent magnet 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). Doubly salient permanent magnet motors have the advantages of high power density, simple structure, large torque/current ratio, and suitable for high-speed operation, but there are problems such as the inability to adjust the air gap magnetic field and the difficulty of demagnetization when a fault occurs. Therefore, on the basis of the permanent magnet doubly salient motor, an electrically excited doubly salient motor (DSEM) is derived. When the stator and rotor pole arc lengths satisfy 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 excitation winding will not change with the rotation of the rotor, so the doubly salient motor has no positioning torque when it is stationary, and the interlinkage flux on the doubly salient motor winding is only proportional to the permeance. When operating as a generator, the output voltage can be easily adjusted by adjusting the excitation current. When operating as a motor, it has the advantages of high operating efficiency and good speed regulation performance of a DC motor.

Contents of the invention

The purpose of the present invention is to provide an axial magnetic flux two-phase electric excitation double salient pole motor, which solves the problems of the existing motors that the structure is too complicated and the excitation magnetic field is uncontrollable. The invention has the beneficial effects of high efficiency, high power density, adjustable excitation magnetic field, stable output voltage and compact structure.

The technical solution adopted in the present invention is to include stator sleeve, stator disc A, stator salient pole A, armature winding A, field winding, armature winding B, stator salient pole B, stator disc B, rotating shaft and rotor iron core; wherein, stator disk A and stator disk B are set inside the stator sleeve, stator salient poles A are evenly distributed on the surface of stator disk A facing the rotor, and stator poles are evenly distributed on the surface of stator disk B facing the rotor. Salient pole B, armature winding A is wound on stator salient pole A, armature winding B is wound on stator salient pole B, stator salient pole A and stator salient pole B are in alignment.

Further, two opposing windings of the armature winding A constitute a phase, two opposing windings of the armature winding B constitute a phase, and the opposing windings of the armature winding A and the armature winding B constitute a phase.

Further, the current direction of the excitation winding is clockwise, and surrounds the inner surface of the stator sleeve.

Further, the rotor core with a salient pole structure is located inside the stator sleeve, between the stator salient pole A and the stator salient pole B, and is sleeved on the rotating shaft.

Description of drawings

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

1. Stator sleeve; 2. Stator disk A; 3. Stator salient pole A; 4. Armature winding A; 5. Excitation winding; 6. Armature winding B; 7. Stator salient pole B; 8. Rotary shaft; 9. Rotor core; 10. Stator disk B.

Detailed ways

The present invention will be described in detail below in combination with specific embodiments.

As shown in Figure 1, the present invention includes a stator sleeve 1, a stator disc A2, a stator salient pole A3, an armature winding A4, an excitation winding 5, an armature winding B6, a stator salient pole B7, a rotating shaft 8, and a rotor core 9 , The stator disk B10. The excitation winding 5, which is excited by the clockwise direction of the current, surrounds the inner surface of the stator sleeve 1 to provide an excitation magnetic field for the motor; the armature winding A4 and the armature winding B6 are respectively wound on the stator salient pole A3 and the stator salient pole B7, and the motor generates electricity When running, it is connected to the electric load, and when the motor is in electric operation, it is connected to the power supply.

The two opposite windings in the armature winding A4 form a phase, the two opposite windings in the armature winding B6 form a phase, the upper and lower windings of the armature winding A4 and the armature winding B6 form a phase, and the whole motor has a total of two phases winding.

The stator salient pole A3 and the stator salient pole B7 are fan-shaped, and are evenly distributed on the plane of the stator disc A2 and the stator disc B10 facing the rotor core 9 respectively, and the salient poles on the stator salient pole A3 and the stator salient pole B7 are aligned Location. The stator disk A2 and the stator disk B10 are set inside the stator sleeve 1 and located on both sides of the rotor core 9 . The rotor core 9 with a sector-shaped salient pole structure is set on the rotating shaft 8, and is located inside the space surrounded by the stator sleeve 1, the stator disc A2, and the stator disc B10. The stator salient pole A3 and the rotor core 9, the stator There is an air gap of a certain length between the salient pole B7 and the rotor core 9 .

When the present invention operates as a generator, the prime mover drives the rotating shaft 8 and the rotor core 9 to rotate. Due to the existence of salient poles on the rotor core 9, the motor armature winding A4 and armature winding B6 will be caused to rotate when the rotor core 9 rotates. The magnitude of the magnetic flux changes, so that the electromotive force is induced in the motor armature winding A4 and armature winding B6, and the magnitude of the induced electromotive force is related to the rotor speed. When the present invention operates as a motor, according to the position of the rotor iron core 9, the forward or reverse current can be passed into the two-phase winding composed of the armature winding A4 and the armature winding B6 to generate torque. The phase difference of the two phase currents is 90°.

The present invention has the advantages of:

1. The excitation magnetic field established by the excitation winding is adopted, the excitation field is adjustable, the excitation efficiency is high, the stability is high, and the rotor structure is simple.

2. Adopting the same polarity structure, the motor has lower iron loss.

3. The number of salient poles of the rotor core is at least 3, which is lower than the existing technical solution, which is beneficial to reduce iron loss and reduce the burden on the controller.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Any simple modifications made to the above embodiments according to the technical essence of the present invention, equivalent changes and modifications, all belong to this invention. within the scope of the technical solution of the invention.

Claims (4)

1. An axial flux two-phase electric excitation double salient pole motor is characterized in that: it comprises a stator sleeve, a stator disc A, a stator salient pole A, an armature winding A, an excitation winding, an armature winding B, a stator Salient pole B, stator disc B, rotating shaft and rotor core; Among them, the stator disc A and the stator disc B are set inside the stator sleeve, the stator disc A is evenly distributed on the surface facing the rotor, and the stator salient poles are evenly distributed on the surface of the stator disc B facing the rotor. B, the armature winding A is wound on the stator salient pole A, the armature winding B is wound on the stator salient pole B, and the stator salient pole A and the stator salient pole B are in the aligned position. 2. According to claim 1, a kind of axial magnetic flux two-phase electric excitation double salient pole motor is characterized in that: the opposite two windings in the armature winding A form a phase, and the opposite two windings in the armature winding B The two windings constitute a phase, and the opposing windings of armature winding A and armature winding B constitute a phase. 3. An axial magnetic flux two-phase electric excitation double salient pole motor according to claim 1, wherein the current direction of the excitation winding is clockwise and surrounds the inner surface of the stator sleeve. 4. An axial magnetic flux two-phase electric excitation double salient pole motor according to claim 1, characterized in that: the rotor core with a salient pole structure is inside the stator sleeve, between the stator salient pole A and between the salient poles B of the stator and fit on the rotating shaft.