FIELD: electricity, electric equipment.
SUBSTANCE: invention is related to the sphere of electric equipment and may be used in electromechanical systems during operation of several electric motors for common load in fast-acting controlled electric drives of conveyors, weight lifting cranes, and other equipment, which should meet strict requirements of dimensional-weight and operation characteristics. Technical result is exclusion of dynamic loads on electric drive and executive mechanism, which occur during joint operation of two and more electric motors for common load and increase of reliability and durability of technological equipment operation. In multimotor frequency-regulated electric drive there are n similar in power local electric drives, which operate for common load. Every electric drive includes electric motor, transmitting mechanism, sensor of electric motor rotor rotation speed, setter of current angular speed and controller of multimotor electric drive rotation speed. Electric motors are induction motors, and speed sensors are pulse sensors. Pulse sensors have two outputs: by angle of turn and by speed. Every local electric drive contains sequentially connected unit of moment vector control of electric motor and power transducer, the output of which is connected to windings of induction motor control. Multimotor electric drive is equipped with averaging device of local electric drives speeds. In every local electric drive the first input of electric motor moment vector control is connected with output of multimotor electric drive rotation speed controller, and the second input - with output of pulse sensor by turn angle. Output of pulse sensor by speed of all local electric drives is connected to the input of averaging device of local electric drives speeds, the output of which is connected to the second input of multimotor electric drive rotation speed controller.
EFFECT: improves reliability and durability of electric drive operation and exclusion of dynamic loads on electric drive and executing mechanism, which occur during joint operation of two and more electric motors for common load.
2 cl; 3 dwg
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