Frequency transverter for operating polyphase induction motor - with control electronics to set operating frequency and voltage according to ideal motor speed

摘要

A frequency transverter is for the operating of an asynchronous polyphase induction motor. The operating frequency and the operating voltage of the motor are determined by an electronic control system in accordance with the ideal revolution speed of the motor. A signal corresponding to the prevailing actual speed of the motor is fed to the control electronics and the operating voltage and frequency are adjusted in accordance with the actual revolution speed and storage values, which embody for different actual speeds those voltages and speeds at which the motor works with a high degree of efficiency. The control electronics regulate the operating frequency in accordance with the ideal speed and the actual speed. ADVANTAGE - The motor works with an optimum degree of efficiency with an adjusted revolution speed