Importance

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Abstract

There is disclosed an apparatus for controlling an electric motor, which comprises a plurality of detectors for detecting the operating conditions of an electric motor, a digital computing circuit for digitally operating on the detection signals from the detectors to produce various digital control amounts, reference register groups for storing the various digital control amounts or predetermined values as reference data, an instantaneous register group for storing a plurality of instantaneous data indicative of the instantaneous operating conditions of the electric motor, a comparison circuit for comparing the corresponding reference and instantaneous data for each stage, a circuit for storing the comparison result from the comparison circuit, an incrementer/decrementer for increasing or decreasing the instantaneous data by a unit value for each stage, and a stage counter for enabling the comparison circuit to compare the various reference data with the corresponding instantaneous data in a time-divisional manner, whereby the comparison circuit and the incrementer/decrementer are used in common for the various data, thereby to ensure accurate speed control of an electric motor and the production of the output pulses required for controlling the motor in accordance with the operating conditions of the motor by means of a relatively simple circuitry.

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First Claim