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Pseudo Bipolar PWM Switching in DC Motor Braking

IP.com Disclosure Number: IPCOM000052216D
Original Publication Date: 1981-May-01
Included in the Prior Art Database: 2005-Feb-11

Publishing Venue

IBM

Related People

Authors:
Green, TA [+details]

Abstract

In braking a DC motor from high velocities, the deceleration rate is often difficult to control. Initially, the motor back emf (BEMF) may be high, causing excessive deceleration, while at low velocities, the BEMF alone will cause insufficient deceleration. Thus, a motor driver is required which will oppose the BEMF at high velocities while adding to it at lower velocities. Therefore, a bipolar-type driver is advantageous.