Electric motor controller resonance frequency detection apparatus

摘要

A resonance frequency detector for an electric motor controller in which a resonance frequency can be measured at high speed by a simple calculation and the resonance frequency can be detected by an inexpensive computer is provided. In an electric motor control system including an electric motor (3) for driving a machine, a detecting unit (5) for detecting an amount of operation of the machine (3) and a controller (2) for receiving a control command to drive the electric motor (3), a command generator (1) generates a sweep sine wave signal to input the signal to the electric motor control system, and the frequency information of the sweep sine wave signal outputted by the command generator (1) and the signal of the detecting unit (5) are inputted to output the frequency of the sweep sine wave signal when the absolute value of the signal of the detecting unit (5) becomes maximum as a resonance frequency.