Patent · US Expired

Method and apparatus for DC motor speed control

US5261025A · kind A · utility

14Cited by
20References
15Claims
0Family size

Assignee

Inventors

Key dates

Filing dateJan 19, 1989
Grant dateNov 9, 1993
Priority date—
Expiry dateJan 19, 2009

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY10S388/915
  • WIPO fieldTransport
  • WIPO sectorMechanical engineering

Abstract

In a preferred embodiment, a high-frequency, pulse-width-modulated, power-transistor, DC motor speed controller having current limiting in both drive and regenerative modes, essentially constant ramping rates regardless of whether or not the operator switches to neutral before changing direction, a simple sequencer which controls the timing of four functions--both drive and regenerative current measuring circuits and both drive and regenerative transistors, a highly effective transistor filter capacitor arrangement, and circuitry in which the level of regenerative current is used as an input to control the current under which the direction relays switch.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.