CONTROL APPARATUS FOR SYNCHRONOUS ROTARY MACHINE ENABLING SUPPRESSION OF ROTOR VIBRATION

摘要

In a synchronous rotary machine such as a synchronous motor, respective values of the number of pole pairs of the rotor and the number of stator slots are predetermined such as to enable drive currents to be passed through the stator windings which suppress specific varying electromagnetic forces that act on the rotor and produce vibration. The drive current of each phase of the motor consists of a fundamental-frequency sinusoidal waveform current having specific harmonic-frequency currents superimposed thereon, the harmonic-frequency currents having angular velocities which are appropriate, with respect to the angular variation velocities of the specific varying electromagnetic forces, for suppressing these forces.

主权项

1. A control apparatus for a synchronous rotary machine, the rotary machine comprising a rotor having P pole pairs, where P is a positive integer, and a stator having S slots, where S is a positive integer equal to 3 or greater, the stator wound with stator windings of respective phases;
wherein designating a prescribed value as a value obtained by multiplying a lowest common multiple K of the number of slots S and double the number of pole pairs P by a positive integer, designating a value obtained by multiplying a sum of the prescribed value and the number of slots S by a mechanical angular velocity of the rotor, and a value obtained by multiplying a difference between the prescribed value and the number of slots S by the mechanical angular velocity of the rotor, as respective suppression-object angular velocities, and designating a first angular velocity and a second angular velocity as respective prescribed angular velocities, the first angular velocity being obtained by multiplying a sum of the prescribed value and the number of pole pairs P by the mechanical angular velocity of the rotor and the second angular velocity being obtained by multiplying a difference between the prescribed value and the number of pole pairs P by the mechanical angular velocity of the rotor, the control apparatus comprises current passing circuitry configured for passing fundamental-frequency sinusoidal-waveform currents through the stator windings, each fundamental-frequency sinusoidal-waveform current having superimposed thereon at least one harmonic-frequency current having an angular velocity equal to a prescribed angular velocity, for thereby suppressing a varying electromagnetic force acting on the rotor and having an angular variation velocity equal to a suppression-object angular velocity.