Variable speed asynchronous induction motor

Details Variable speed asynchronous induction motor Variable speed asynchronous induction motor

1992-05-22

1993-05-18

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318795, H02P 144

Patent

active

052124355

ABSTRACT:
A single-phase half-pitch capacitor induction motor capable of being varied in rotational speed between a low rotational speed and high rotational speed. The motor includes a main winding connected across a single-phase electrical power source and an auxiliary winding connected in parallel with the main winding. A first phase shifting capacitor is connected in series with the auxiliary winding. A second capacitor is connected in parallel with the first capacitor and a variable resistor is connected in series with the second capacitor. By increasing and decreasing the resistance, overall capacitance in series with the auxiliary winding is increased and decreased and the rotational speed is, thus, also varied. A single pole, single throw switch or a thermistor can be used instead of a variable resistor for different applications.

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