Analysis of the phase control of synchronous electric motor with permanent magnets

Abstract

The article deals with a detailed description of phase control provided for the synchronous motor with permanent magnets basing on the simultaneous regulation of the motor supply voltage amplitude and phase. The phase control method makes it possible to implement a variety of motor control strategies at the expense of voltage vector purposeful formation, for example, setting to the maximum efficiency or the maximum of electromagnetic torque. It presents mechanical and adjustment characteristics of the synchronous motor with permanent magnets at different settings of the phase control system. The phase motor control functional diagram is presented. Coordinate converters are absent in the phase motor control scheme, also, it can be dispensed with measurements of phase currents at rotor angular position measuring. The article deals with comparative analysis of the phase control and the classic-frequency-current “vector” control of the motor. The comparison is based on the quality regulation indicators, costs of control system resources and implementation complexity.