Displacement sensor with a movable element shaped to provide a l

Details Displacement sensor with a movable element shaped to provide a l Displacement sensor with a movable element shaped to provide a l

1991-04-02

1994-05-17

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Displacement

32420722, 32420724, G01B 714

Patent

active

053131614

ABSTRACT:
The present invention relates to a solenoid device such as a flow control valve and a displacement sensor. In a conventional solenoid device, it is not possible to get characteristic curve for easy control of the input voltage to an electromagnetic coil and the stroke of a plunger, or the stroke of a plunger and the frequency of a coil. Thus, it is difficult to control, land the stroke of the plunger is short. Therefore, in the present invention, the above stated disadvantages are solved by forming the end section of the plunger tapered, so that an electromagnetic valve having linear characteristic curve and longstroke plunger or a highly precise displacement sensor can be provided.

REFERENCES:
patent: 5045785 (1991-09-01), Hansen
patent: 5046702 (1991-09-01), Miyazawa et al.

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