Phase angle control circuit for motors

Details Phase angle control circuit for motors Phase angle control circuit for motors

1987-04-20

1988-12-27

Ro, Bentsu

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318345G, H02P 714

Patent

active

047943106

ABSTRACT:
A control circuit for d-c motors, which are supplied by an a-c supply through phase angle control, and which obtains information regarding the actual current value from a current transformer secondary voltage, and which is utilized additionally also for detecting the point of current zero-axis crossing, which, for example, is required before a motor current direction reversal. For recognition of the current zero-axis crossings the fact is utilized, that the ends of the current pulses occuring with low motor current (interrupted current) have voltage peaks opposite to the pulse current direction, which is caused by the reduction of the residual magnetic energy of the current transformer after each current pulse. The pulses of alternating direction generated by the current transformer are converted by controlled polarity reversal into pulses of the same polarity, the current zero-axis crossing of which at the pulse end is detected with a comparator circuit at the correct time.

REFERENCES:
patent: 4326153 (1982-04-01), Contri
patent: 4481448 (1984-11-01), Bishop
patent: 4513381 (1985-04-01), Houser, Jr. et al.
patent: 4549122 (1985-10-01), Berkopec et al.
patent: 4658192 (1987-04-01), Casteel et al.

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