Circuit for starting single-phase AC induction motor
AssigneeMurata Manufacturing Co., Ltd.
InventorsYoshihiro Yamada, Shigehiro Ichida, Yuichi Takaoka
Life of this patent
Estimating the term…
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.
Claims5
A circuit for starting a single-phase AC induction motor having a main winding and an auxiliary winding, comprising:
- a positive temperature coefficient thermistor element connected in series with the auxiliary winding;
- a triac having first and second main terminals and a gate terminal, a portion between said first and second main terminals being connected in series with said positive temperature coefficient thermistor element;
- and
- a trigger circuit connected to the gate terminal of said triac and reducing a gate voltage of the triac to turn the triac off after a predetermined time period has elapsed since the single-phase AC induction motor was started.
Dependencies are inferred from the claim text.