Multiple speed split-phase induction motor

Details Multiple speed split-phase induction motor Multiple speed split-phase induction motor

1982-10-07

1984-04-17

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318786, 318793, H02P 142

Patent

active

044437498

ABSTRACT:
An AC split-phase induction motor has a two-pole run winding, a four-pole run winding and a separate start or phase winding. The two-pole winding is connected directly to a corresponding first power terminal. The second run winding is connected to a second power terminal by a solid state gated run switch having a turn-on gate. The start winding is connected in circuit in series with a solid state gated start switch connected to the first power terminal and having a gate connected to a second power terminal. A centrifugal switch connects the first and second power terminals. The gate of the run switch is connected to the start winding circuit and includes connecting Diac and resistance elements to actuate the run switch only in response to a power connection to the second power terminal and the opening of the centrifugal switch. In operation, the motor always starts with the two-pole run winding and the start winding in the circuit. At switching speed, the start switch disconnects the start winding. Depending upon the power terminal connection, the motor continues to run with power supplied to the two-pole run winding or actuates the solid state gated run switch of the four-pole winding to operate as a four-pole motor.

REFERENCES:
patent: 2669683 (1954-02-01), Burdett
patent: 3153184 (1964-10-01), Stout
patent: 4314987 (1982-07-01), Fisher

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