A control method of a circumferential and axial hybrid phase-distributed switched reluctance motor

Abstract

The invention discloses a circumferential and axial mixing phase distribution switch reluctance motor control method. A circumferential and axial mixing phase distribution switch reluctance motor is a 2*3 phase or 3*2 phase or 2*2 phase structure. The method comprises the following steps of receiving a forward-rotating or reverse-rotating starting instruction; detecting a rotor position; and executing a forward-rotating transition phase work circulation or a reverse-rotating transition phase work circulation, wherein stator cores take turns to carry out transition phase. In the method, 2*3 phase and 3*2 phase structure motors realize 6 phase control through transition phase among the stator cores by turns; and a 2*2 phase structure motor realizes 4 phase control through the transition phase among the stator cores by turns. The phase number is increased, an effect pole number is not reduced, during a transition phase process, each related broken angle can be advanced, motor operation is smooth so that a torque pulsation and noises are improved, and the method is mainly applied in the switch reluctance motor field.

Description

Technical field [0001] The invention relates to the field of control methods for switched reluctance motors, and in particular to a control method for switched reluctance motors with mixed phase distribution in the circumferential direction and axial direction. Background technique [0002] The current switched reluctance motors mainly have the problems of torque ripple and noise, and there are certain reasons from the structural analysis. Taking the most commonly used 3-phase switched reluctance motor as an example, the salient poles of the rotor go from the active position to the position of the saliency of the stator. , The tangential force changes from a large value to zero, and the radial force changes from a small value to a maximum value. The change in the amplitude of the tangential force mainly affects the torque ripple, and the change in the amplitude of the radial force mainly affects the noise, especially at low speeds. , The working end of the salient pole of the rot...

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Problems solved by technology

The current switched reluctance motors are mainly distributed phases in the circumferential direction. In theory, there can be 2 phases, 3 phases, 4 phases, ..., q phases, q is a natural number, and 2-phase switched reluctance motors have the largest number of active poles, and the number of active poles It is 1 / 2 of the number of salient poles of the stator core, but it cannot be started at any position and forward and reverse. The 3-phase switched reluctance motor has more active poles, and the number of active poles is 1 / 3 of the salient poles of the stator core. It can be started and reversed at any position. More phases means a reduction in the number of active poles, which will inevitably sacrifice the torque and efficiency of the motor. The circumferential phase arrangement determines that the motor cannot increase the number of phases arbitrarily. Directional hybrid phase distribution switched reluctance motor, such as a circumferential and axial hybrid phase distribution switched reluctance motor described in the patent application number "CN 2016204654682", through multiple q-phase stator core dislocation installation or rotor core dislocation The multiplication of phases can be achieved after installation, but too many phases will also lead to an increase in the number of control components. Among them, the relatively simple and effective structure is 2×3 phase, 3×2 phase and 2×2 phase structure hybrid phase switching reluctance motor

Since the existing technology only has control methods for single-core switched reluctance motors, taking a 3-phase switched reluctance motor as an example, the phase windings are defined as phase A, phase B, and phase C, and the commutation cycle is "A→B →C→A" or "A←B←C←A", there is currently no control method for circumferential and axial mixed-phase switched reluctance motors

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