Starting device for a single phase induction motor

Details Starting device for a single phase induction motor Starting device for a single phase induction motor

1992-01-29

1994-04-12

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318784, 318785, H02P 144

Patent

active

053028856

ABSTRACT:
A starting device for a single phase induction motor, of the type having a cage type rotor and a stator having at least one main coil and one starting coil, which is connected in series with first and second terminals of an alternating current source. The starting device comprises a relay (RL) having at least one contact, with one of the terminals thereof being connected to the first terminal (1) of the alternating current source (F), while the other terminal of said contact is connected to the terminal of the starting coil (L2); and a coil (B) for actuating the relay; an electronic timer circuit (T), which is connected to the terminals of the coil (B) for actuating the relay (RL), in order to open the contact of the latter by supplying a current to the coil (B) thereof, thereby finishing the starting operation of the motor (M), after a period of time has elapsed from the motor (M) powering up. In case the motor includes a permanent capacitor (CP), said capacitor will be connected in series with a starting coil (L2) between the terminal of the latter and the first terminal ( 1) of the alternating current source.

REFERENCES:
patent: 3596158 (1971-07-01), Waltrous
patent: 4431958 (1984-02-01), Schutten et al.
patent: 4568195 (1987-04-01), Min
patent: 4804901 (1989-02-01), Pertessis et al.
patent: 5051681 (1991-09-01), Schwarz
patent: 5077512 (1991-12-01), Weber

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