Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1993-02-12
1994-06-28
Shoop, Jr., William M.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318797, H02P 144
Patent
active
053250354
ABSTRACT:
A single phase induction motor having a main field winding and an auxiliary field winding provided with a phase advancing capacitor is controlled by a control unit having a timer unit and a by-pass switch for by passing the phase advancing capacitor. The main field winding is provided with a main switch operable by a relay controlled by the timer. The control unit also has a clutch detecting unit which detects the engagement and disengagement of the clutch adapted to couple the motor with a load such as a sewing machine. The timer is so set to activate the relay after a predetermined time period when the clutch is disengaged to relieve the motor of its load, whereby the relay causes the main switch to open, and the by-pass switch to close, such that the motor is operated solely on the auxiliary field winding when no load is applied, so as to save the power consumption at an idling operation.
REFERENCES:
patent: 4364001 (1982-12-01), Heidt et al.
patent: 4366425 (1982-12-01), Shen
patent: 4388581 (1983-06-01), Bhatnagar
patent: 4823067 (1989-04-01), Weber
patent: 5227710 (1993-07-01), Lewus
Shoop Jr. William M.
Sircus Brian
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