Positive-displacement fluid motor having self-stopping function, and method and control circuit for stopping the motor
US4785714A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1987 |
| Grant date | Nov 22, 1988 |
| Priority date | — |
| Expiry date | Jul 27, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B49/02
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A positive-displacement fluid motor wherein a rotating member rotated by pressurized fluid flows to and from fluid chambers can be stopped at a desired one of at least one predetermined angular position by a torque produced by the motor itself. The fluid is supplied into at least one advancing fluid chamber of the fluid chambers which acts to rotate the rotating member in an operating direction of the motor, while causing the fluid to be discharged from at least one reversing fluid chamber of the fluid chambers which acts to rotate the rotating member in a direction opposite to the operating direction, if a motor stop command is generated when the desired angular position is ahead of a current position of the rotating member in the operating direction of the motor. The fluid is supplied into the at least one reversing fluid chamber while causing the fluid to be discharged from the at least one advancing fluid chamber, if the motor stop command is generated when the current position of the rotating member is ahead of the desired angular position in the operating direction of the motor. The rotating member functions to control the fluid flows into and from the advancing and reversing…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.