Electric motor drive control apparatus

Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...

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388815, 318434, 318453, H02P 729

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active

055307884

ABSTRACT:
An apparatus for controlling a drive circuit having a supply of electric power from a power source to drive an electric motor. The drive circuit includes at least one switching element operable between a first state connecting the electric motor to the power source and a second state disconnecting the electric motor from the power source in the second state. An overcurrent detection signal is produced when the current flow through the electric motor exceeds a predetermined value. In the presence of the overcurrent detection signal, the switching element is changed to the second state. The switching element is fixed in the second state when the repetitive period of the overcurrent detection signal is less than a predetermined value to avoid an excessive amount of heat generated from the switching element because of transient power losses.

REFERENCES:
patent: 4514670 (1985-04-01), Fassel et al.
patent: 4990836 (1991-02-01), Nakase et al.

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