Development of an Analytical Theory for a Single-Phase Line-Start Permanent-Magnet Synchronous Motor

Abstract

A line-start permanent-magnet synchronous motor (LSPMM) is expected to operate with super-high efficiency, because it can be started as an induction motor and then operated as a permanent magnet synchronous motor. Therefore, in the single-phase LSPMM, high efficiency operation is more possible than in the capacitor motor.
In this paper, an analytical theory based on tensor analysis is proposed for practical performance calculation of a single-phase LSPMM. The general equations for the currents of the single-phase LSPMM are derived from the transient impedance tensor expressed in polyphase symmetrical axes, and the general equation for vibratory and non-vibratory torques is derived from the equations of current.