Patent Number: 6,166,500

Title: Actively controlled regenerative snubber for unipolar brushless DC motors

Abstract: An actively controlled regenerative snubber configuration for use in unipolar brushless direct current motors comprises a first inductor, a first switch and a capacitor, all of which are connected in series to a positive voltage supply and in parallel with a second inductor and a second switch. The regenerative snubber is used to maintain constant voltage across the switches to prevent braking of the motor through conduction of motor back EMF and to return excess energy stored in the motor phase coils to the positive voltage supply. The return of energy to the positive rail is done in a manner so as to minimize conducted electromagnetic interference at the power leads.

Inventors: Makaran; John Edward (London, CA)

Assignee: Siemens Canada Limited

International Classification: H02P 6/00 (20060101); H02M 3/04 (20060101); H02M 3/155 (20060101); H02K 023/00 ()

Expiration Date: 12/26/2017