Single phase motor start system

Details Single phase motor start system Single phase motor start system

1991-12-06

1993-05-18

Ro, Bentsu

Electricity: motive power systems

Induction motor systems

Primary circuit control

318778, 318781, 318787, H02P 144

Patent

active

052124363

ABSTRACT:
An autotransformer is used to replace the start capacitor in a split phase induction motor. The autotransformer windings are protected by a PTC resistor which also serves to effectively de-energize the auxiliary winding. In a preferred embodiment, efficiency of the motor in the run mode is enhanced by shunting the secondary of the autotransformer with an NTC element. In alternative embodiments a relay coil is placed in series with the auxiliary winding circuit to remove the PTC and the primary of the autotransformer from the circuit when the motor is in the run mode.

REFERENCES:
patent: 3673480 (1972-06-01), Johnstone
patent: 3916274 (1975-10-01), Lewus
patent: 3965392 (1976-06-01), Moorehead et al.
patent: 4387330 (1983-06-01), Zigler
patent: 4463304 (1984-07-01), Miller
patent: 4467257 (1984-08-01), Douthart et al.
patent: 4574229 (1986-03-01), Kim
patent: 4734601 (1988-03-01), Lewus
patent: 4794288 (1988-12-01), Lewus
patent: 4820964 (1989-04-01), Kadah et al.

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