V/F CONTROL SYSTEM OF SYNCHRONOUS ELECTRIC MOTOR

摘要

PROBLEM TO BE SOLVED: To provide a V/f control system capable of suppressing and improving responses, such as transient vibration, even if a load disturbance occurs in a synchronous electric motor, such as a permanent synchronous electric motor that possesses low-inertial features.

SOLUTION: A filter averaging processing section 36 detects a DC average current from a DC bus bar of an inverter 4, a torque ripple estimating section 38 obtains a DC average power from the DC average current of the inverter and a DC voltage, obtains a torque estimated value from the DC average power and a frequency command value ω*, and removes the components which are close to DC from the value to obtain a torque ripple component ΔT. A stabilization gain setting device 39 executes correction at a correction value Δω, corresponding to ΔT to stabilize V/f so as to suppress the torque ripples. A stabilization gain setting device 40 obtains a voltage correction value Δv, corresponding to the torque ripple component ΔT, and executes feedback compensation with respect to a voltage command value Vmof the inverter with the voltage correction value Δv.

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