起磁力相差角一定制御方式による内部磁石形PMモータの可変速運転

概要

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A novel and simple control scheme of the interior type permanent magnet synchronous motor having high efficiency and good dynamic response was described. The prominent feature of the control scheme is to always keep the MMF phase angle φ at a constant value, which was derived on basis of the theory using φ instead of the interior phase angle δ as a parameter. The φ constant control is implemented by the control of only the current phase, and its amplitude is used to control the instantaneous torque. Such a decoupled control of both the phase and the amplitude of armature current results in very simple control scheme. The value of φ to be kept constant was determined after studying the performance variation dependent on φ. The experimental results showed superior steady state performance and excellent four quadrant operation.