Sensorless measurement of electromagnetic actuator displacement

Details Sensorless measurement of electromagnetic actuator displacement Sensorless measurement of electromagnetic actuator displacement

1996-06-04

1998-11-24

Fleming, Fritz

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361143, 32420711, 340683, G08B 2100

Patent

active

058416218

ABSTRACT:
This invention pertains to sensorless measurement of electromagnetically induced displacement in actuators and similar units. Primarily, the device imposes a constant frequency and amplitude excitation sine wave on a coil through a fixed impedance of a drive isolation network. The amplitude and phase of the voltage across the coil fluctuate depending upon the coil's inductance. This variation in the value of the inductance is dependent upon the change in magnetic flux density generated by the coil current and the displacement in air gap between the coil pole and armature. Accordingly, a measurable magnitude of displacement can be controllably imposed upon a system of solenoids. The displacement is thus measured and set without the use of extrinsic sensors.

REFERENCES:
patent: 4074185 (1978-02-01), Dardenne
patent: 4659969 (1987-04-01), Stupak, Jr.
patent: 4851959 (1989-07-01), Stumpf
patent: 4950985 (1990-08-01), Voss et al.
patent: 4970622 (1990-11-01), Buchl
patent: 5172298 (1992-12-01), Shimizu et al.
patent: 5196983 (1993-03-01), Stumpf
patent: 5206540 (1993-04-01), de Sae Silva et al.
patent: 5293551 (1994-03-01), Perkins et al.
patent: 5539608 (1996-07-01), Hurley et al.
patent: 5602711 (1997-02-01), Curtis et al.

Affiliated with

Also associated with

Rating

Sensorless measurement of electromagnetic actuator displacement does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Sensorless measurement of electromagnetic actuator displacement , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sensorless measurement of electromagnetic actuator displacement will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1709861