Patent Number: 6,683,437

Title: Current controlled motor amplifier system

Abstract: Aspects of a current controlled motor amplifier system are provided. These aspects include a current source motor amplifier comprising current source means on each leg of a top half of the H bridge configuration and switching means on each leg of a bottom half of the H bridge configuration. A motor is coupled to the current source motor amplifier at a center portion of the H bridge configuration. Control circuitry is coupled to the current source motor amplifier for controlling the switching on of the current source motor amplifier for a predetermined time to operate the top half of the H bridge configuration essentially as a linear constant current source and the bottom half of the H bridge configuration in switching mode. The aspects also allow for simplified circuitry to protect against overvoltage conditions and eliminate electrical damping in applications with higher rotational velocities associated with induced back EMF.

Inventors: Tierling; Kollin (Milpitas, CA)

Assignee: Immersion Corporation

International Classification: H02M 3/158 (20060101); H02M 3/04 (20060101); H02P 7/00 (20060101); H02P 005/28 ()

Expiration Date: 01/27/2021