Control apparatus for synchronous rotary machine enabling suppression of rotor vibration

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.