Torque excitation control system and torque excitation control method using an embedded magnet synchronous motor

摘要

PROBLEM TO BE SOLVED: To provide a torque excitation control system using IPMSM10 capable of avoiding voltage saturation of an inverter output voltage in all loci on a voltage ellipse of a voltage command value. SOLUTION: A current command (id ^* , iq ^* ) is calculated based on a torque command τ ^* (= A _τ sinω _τ t + τ ₀ ) having a DC torque τ ₀ and vibrating at an amplitude A _τ and an angular frequency ω _τ. , A system that operates the PWM inverter 20 connected to the IPMSM 10 by the current command, and in the torque control unit 30, each vector (vd1, vq1) of the voltage command values at τ0-Aτ, τ0 + Aτ, τ0 in the excitation torque command. ), (Vd2, vq2), (vd3, vq3), the maximum value V _rmax (= √ (vd ² + vq ² )) of the magnitude of the voltage command in one cycle of the torque command τ ^* is obtained, and the maximum value is obtained. The d-axis current command value id ^* is set so that the value V _rmax is equal to or less than the maximum output voltage value V _{max of the} PWM inverter 20. [Selection diagram] Fig. 1