MOTOR CONTROL APPARATUS WITH A PROTECTION MODE BASED ON THE EFFICIENT VALUE OF THE NON-SINUSOIDAL STATORIC CURRENT INVERSE COMPONENT

摘要

MOTOR CONTROL APPARATUS WITH PROTECTION MODE BASED ON THE EFFICIENT VALUE OF THE NON-SINUSOIDAL STATOR COMPONENT INVERSE COMPONENT. / P P IN THIS APPARATUS, THE CURRENT INVERSE COMPONENT IS DETERMINED BY MONITORING L1, L2 THREE-PHASE LINES AND L3 FEEDING THE ENGINE IN STARTING STATUS. THE STATORIC WINDING CURRENTS ARE CONVERTED INTO DIRECT COMPONENT AND INVERSE COMPONENT IN THE MICROPROCESSOR SO THAT THE EFFICIENT VALUE OF THE REAL INSTANTANEOUS CURRENT FLOW THROUGH THESE WINDINGS CAN BE OBTAINED. THIS IS TRUE THAT THE CURRENT IS SINUSOIDAL OR NON-SINUSOIDAL. BY USING FOR THE ROTOR AN APPROPRIATE MODEL OF THERMAL CIRCUIT EQUIVALENT, A PREDETERMINED CURRENT VALUE OF CURRENT IS BEING DETERMINED BEYOND WHICH STARTING OR STARTING THE ENGINE IS INTERRUPTED. The control unit 26, connected to the lines by transformers 30, gives an indication of the value of the currents in the lines. A UNIT 29 DETECTION OF THE RESISTANCE TEMPERATURES IS CONNECTED TO THE MOTOR BY A CABLE 34, THESE RESISTORS BEING PLACED IN THE REGIONS OF THE INDUCING WINDINGS AND THE BEARINGS OF THE MOTOR. / P P APPLICATIONS IN PARTICULAR INDUCTION ELECTRIC MOTORS.