An alternative universal motor drive with unity power factor operating in DC and AC modes

In this paper, a novel concept on how a universal motor can operate in either DC or AC mode, with unity power factor is presented. This is achieved using a modified topology of a single phase matrix converter. The power electronics converter that drives the motor, as well as the PWM technique that is used to achieve unity power factor are thoroughly analyzed. The two modes of operation are compared in terms of PF and THD that offer. The complete system is fully simulated and the results are evaluated.