PHASE CONTROL OF AN INDUCTION MOTOR

摘要

Systems and methods for controlling an induction motor are provided. In particular, data indicative of an alternating current voltage signal associated with an induction motor can be received. The alternating current voltage signal can be applied to the induction motor through a switching element coupled between a power source and the induction motor. A zero cross voltage signal can then be generated based at least in part on the data indicative of the alternating current voltage signal. A phase delay period for at least one half cycle period of the zero cross signal can then be determined. Operation of the induction motor can then be controlled by providing one or more control signals to the switching element causing the switching element to conduct current for one or more gating periods. Each gating period can be determined based at least in part on the phase delay period.

主权项

1. A method of controlling a motor, the method comprising:
receiving data indicative of an alternating current voltage signal associated with a motor, the alternating current voltage signal being applied to the motor through a switching element coupled in series between a power source and the motor; determining a phase delay period for at least one half cycle period of a zero cross voltage signal based at least in part on a desired operating speed of the motor, the zero cross voltage signal being determined based at least in part on the data indicative of the alternating current voltage signal, the zero cross voltage signal comprising a plurality of half cycle periods; and controlling operation of the motor by providing one or more control signals to the switching element causing the switching element to conduct current for one or more gating periods, each gating period corresponding to at least a portion of a half cycle period of the zero cross voltage signal, each gating period being determined based at least in part on the phase delay period corresponding to the half cycle period.