Multiple speed induction motor

Details Multiple speed induction motor Multiple speed induction motor

1982-10-07

1984-08-21

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318786, H02P 148

Patent

active

044672578

ABSTRACT:
An AC induction motor has a two-pole run winding connected directly to power, a four-pole run winding connected to power by a "Triac" switch, and a separate start winding connected to power by a "Triac" switch and a centrifugal start switch. The centrifugal switch is connected between a common node to the start "Triac" and either one or the other of the power terminals. The motor always starts as a two-pole start and two-pole run winding motor. Depending upon the power terminal connection, the motor continues to run with power supplied to the two-pole run winding, or actuate the "Triac" switch of the four-pole winding to operate as a four-pole motor. In different embodiments, the centrifugal switch is connected between the start circuit terminal and either the power terminal of the four-pole winding or of the two-pole winding.

REFERENCES:
patent: 2669683 (1954-02-01), Burdett
patent: 3153184 (1964-10-01), Stout
patent: 4341987 (1982-07-01), Fisher

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