Start-up control for DC motors

Details Start-up control for DC motors Start-up control for DC motors

1974-09-06

1976-06-08

Rubinson, Gene Z.

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

318341, H02P 118

Patent

active

039626164

ABSTRACT:
Start-up power control of a full wave rectifier supply to a DC permanent magnet motor is provided by an SCR full wave rectifier bridge and a start-up control circuit for the SCR's comprising an independent rectifier for charging up a capacitor through a high impedance path to produce a start-up ramp voltage, a UJT relaxation oscillator powered by the independent rectifier bridge to trigger the SCR's through a transformer, and a series transistor control circuit for the UJT responsive to the ramp voltage to advance the firing angle of th UJT and thereby advance the firing angle of the SCR's as the ramp voltage increases fron 0 to a maximum.

REFERENCES:
patent: 3453517 (1969-07-01), Kennedy et al.
patent: 3525915 (1970-08-01), Barter
patent: 3599062 (1971-08-01), Crane et al.
patent: 3629677 (1971-12-01), Means

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