Direct drive valve and force motor assembly including interchang

Details Direct drive valve and force motor assembly including interchang Direct drive valve and force motor assembly including interchang

1985-05-23

1987-02-10

Rosenthal, Arnold

Valves and valve actuation

Permanent or constantly energized magnet actuator

25112911, 2511292, 335282, 310 36, 310156, 291571R, 29404, F16K 3108, H01F 708, H02K 3300

Patent

active

046418121

ABSTRACT:
A direct drive valve and force motor assembly including interchangeable stator assembly and method for accurately setting the magnetic spring null of the motor with respect to the servo valve hydraulic null independent of the actual motor stator assembly, whereby the motor stator assembly may be configured as an interchangeable plug-in module with interface electrical connector. This is accomplished by using a simple fixture which simulates the motor stator assembly and senses rotor magnet position. The stator simulating fixture may be used to rotatably adjust the position of the rotor casing so that the magnetic spring null corresponds to the hydraulic valve null. Both the stator simulating fixture and motor stator assembly include an index pin engageable with a stator alignment keyway in the rotor casing for maintaining the desired orientation therebetween. Also, rotor over-travel stops keyed to the rotor casing may be centered during the nulling process. Once the nulling process is complete, the stator simulating fixture may be removed and the motor stator assembly may be mounted in place. The motor stator assembly may be loosely held in an outer housing which has limited rotation relative to the motor stator assembly to permit a plug-in electrical connector for the stator windings on the exterior of the outer housing to be brought into alignment with a receptacle in the valve body and plugged into the receptacle without damaging the lead wires. Then the outer housing and motor stator assembly may be clamped in place as by threading a nut on a shaft extension on the outer end of the rotor casing which extends through an opening in an end wall of the outer housing.

REFERENCES:
patent: 4507634 (1985-03-01), Vanderlaan
patent: 4510403 (1985-04-01), Vanderlaan et al.

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