Circuit for starting single-phase AC induction motor

Details Circuit for starting single-phase AC induction motor Circuit for starting single-phase AC induction motor

1993-05-25

1995-02-21

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318471, 318445, 318727, 318783, 318788, H02P 126

Patent

active

053919718

ABSTRACT:
A circuit for starting a single-phase AC induction motor 11 having a main winding 12 and an auxiliary winding 13, which is so constructed that a PTC element 16 and a triac 17 are connected in series with the auxiliary winding 13 and a gate voltage of the triac 17 is reduced to turn a portion between main terminals of the triac 17 off after a predetermined time period has elapsed since the motor 11 was started, and can effectively lower the power consumption without degrading starting characteristics and can shorten return time required until the motor 11 is restarted and lengthen the life of the PTC element 16.

REFERENCES:
patent: 3746951 (1973-07-01), Hohman
patent: 3832612 (1974-08-01), Woods
patent: 4265394 (1981-05-01), Nagel
patent: 4299026 (1981-11-01), De Filippis et al.

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