Method of restarting synchronous motor

同期電動機の再始動方法

Abstract

PROBLEM TO BE SOLVED: To provide a method of restarting a synchronous motor for correcting phase information and preventing an error detection operation when restarting an electric motor from information of one linear voltage in an inexpensive circuit. SOLUTION: A rotational speed and a phase are detected from a voltage detected by a linear voltage detection circuit, and an amount of phase delay by control and an amount phase delay by a circuit are corrected within a controller for restart. Further, a means is provided which notices a difference between an induced voltage estimated from the detected speed and an actually detected induced voltage and determines that the detected frequency has been detected by mistake or the electric motor has stopped and changes the restart when the difference is a fixed value or more. COPYRIGHT: (C)2011,JPO&INPIT
【課題】安価な回路である線間電圧1つの情報から電動機の再始動を行う際、位相情報の補正と、誤検出動作を防止する、同期電動機の再始動方法を提供する。 【解決手段】線間電圧検出回路から検出された電圧から回転数と位相を検出し,制御器内で制御による位相遅れ分と回路による位相遅れ分とを補正し再始動を行う。さらに、検出された回転数から推測された誘起電圧と、実際に検出した誘起電圧との差に着目し、且つその差に一定値以上の差異が生じた場合に、検出された周波数の誤検出もしくは停止中と判断し、再始動を変更する手段を備える。 【選択図】図1

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