Patent ID: 6118241
Filing Date: 2000-09-12
Classification: H02P

Abstract:
A dynamic braking system for a brushless motor comprising:a brushless motor includinga winding with a plurality of phases, andat least one permanent magnet movable relative to said winding;an electrical source with a positive bus and a negative bus;a pair of transistor switches for each phase of said winding,one transistor of each pair for connecting the phase of said winding to said positive bus,and the other transistor of each pair for connecting the phase of said winding to said negative bus;a back-biased diode connected across the collector-emitter circuit of each of said transistors; anda microprocessor for substantially simultaneously rendering conductive all of said transistors connected to one of said buses to provide a braking current path through at least one of said conductive transistors and at least one of said back-biased diodes.