Lossless snubber drive for a permanent magnet synchronous motor

摘要

A loss-less snubber drive for a permanent magnet motor. The motor system includes a first motor phase with a primary winding and an auxiliary winding. A controllable switch is positioned between the primary winding and ground such that current passes through the primary winding to ground when the controllable switch is closed. A capacitor is configured to accumulate charge when the controllable switch is opened. The auxiliary winding is configured such that charge stored by the capacitor causes current to pass through the auxiliary winding when the controllable switch is closed.

主权项

1. A multi-phase electric motor system, comprising:
a first motor phase including
a primary winding,an auxiliary winding,a controllable switch having a collector terminal and an emitter terminal and positioned between the primary winding and ground such that current passes through the primary winding to ground when the controllable switch is closed, anda capacitor electrically connected between the collector terminal of the controllable switch and the auxiliary winding and configured to
accumulate charge when the controllable switch is opened, andcause current to pass through the auxiliary winding when the controllable switch is closed; and a second motor phase including
a second primary winding,a second auxiliary winding,a second controllable switch having a second collector terminal and a second emitter terminal and positioned between the second primary winding and ground such that current passes through the second primary winding to ground when the second controllable switch is closed, anda second capacitor electrically connected between the second collector terminal of the second controllable switch and the second auxiliary winding and configured to
accumulate charge when the second controllable switch is opened, and cause current to pass through the second auxiliary winding when the second controllable switch is closed.