Control system for motor driving inverter

Abstract

Abstract PURPOSE:To reduce magnetic noise by optimally regulating a ratio of a voltage to a frequency in response to a load torque to save an energy. CONSTITUTION:An AC current applied from an inverter 5 to an induction motor 6 is detected, and input to a digital controller 20. A calculator 28 detects whether a current signal tends to increase, decrease or invariable when the frequency of an AC output from the inverter 5 is constant, and instructs the rise of drop of an output voltage to a voltage instruction unit 24. Therefore, when the voltage of the AC output from the inverter 5 is V and the frequency is F, the ratio of the frequency F to the voltage V, i.e., the value of V/F is varied in response to a command from a calculator 28.

Inventors

• 👤 Masaru Sofue
• 👤 祖父江　勝

Bibliographic Details