Chatterless low power AC solenoid without pole shading

Details Chatterless low power AC solenoid without pole shading Chatterless low power AC solenoid without pole shading

1995-04-13

1996-01-09

Shoop, Jr., William M.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

363126, 335257, F15B 13044

Patent

active

054834112

ABSTRACT:
A Chatterless AC Solenoid without pole shading is disclosed. The solenoid has a stationery member and a moveable member forming a magnetic circuit having a small but predetermined gap in the magnetic circuit when the moveable member is in the solenoid actuated position, and a much larger gap when the moving member is in the unactuated position. Both the stationery member and the moveable member are fabricated from a relatively soft magnetic material, with a coil associated with the stationery member providing a magnetizing force for the resulting magnetic circuit responsive to a current in the coil. A first diode in the energizing circuit provides halfwave rectification of the AC excitation voltage, with a second diode across the coil leads providing a conduction path for the portion of the excitation cycle during which the first diode is not conducting, thereby adequately sustaining the magnetizing current in the coil to maintain the solenoid latched until the coil is again reenergized by current flow through the first diode. Alternate embodiments and various features of the invention are disclosed.

REFERENCES:
patent: 3628102 (1971-12-01), Jauch
patent: 3968406 (1976-07-01), Arnoux
patent: 4054802 (1977-10-01), Mock
patent: 4688157 (1987-08-01), Rischmueller
patent: 5076326 (1991-12-01), McCabe

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