Variable speed resistive network for a pneumatic servo assembly of an electro-pneumatic converter
US4583029A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1984 |
| Grant date | Apr 15, 1986 |
| Priority date | — |
| Expiry date | Jul 6, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B5/003
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A resistive network is used for an electro-pneumatic converter so that the speed of the electro-pneumatic converter can be regulated. The converter includes a reversible DC servo motor having a pair of terminals connected to a pair of lines. The lines are selectively connectable to a common terminal of a power supply. The power terminal of the power supply is connected over a variable resistor to a terminal connecting the lines. Selectively connecting one of the lines to the common terminal causes electrical power to pass through the motor and one for an opposite direction to turn the motor shaft in a selected direction of rotation. The speed of rotation is determined by the position of the variable resistor. The motor shaft is used in conjunction with a cam that is associated with a nozzle supplied with pressurized gas over a bellows. The nozzle is moved closer or further away from the cam edge as the bellows expands or contracts. A line connected upstream of the bellows provides gas at a selected pressure which is porportional to the position of the cam. The position of the cam is determined by the rotation of the motor shaft.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.