A DRIVING CONTROL SYSTEM FOR ELECTRIC MOTORS

摘要

A driving control system for electric motors, of the type used in refrigeration compressors and including: a power source (20) in direct current having, between positive (21) and negative (22) terminals of equal voltage, a median terminal (25), of null voltage, to which is directly connected a first coil (11) of the electric motor (10); an inverter (30) provided with N-1 commutation arms with opposite ends connected to the power source (20) and each including switch means, each commutation arm being medianly connected to a respective coil; and a control unit (40) operating the switch means, as a function of the signals received from a position sensor means (50), in order to determine to said switch means, in each of a first and a second switching condition thereof, a switching frequency and a switch conduction period, which are defined in order to be effectively applied to the coils a voltage effectively corresponding to the speed and torque required for the motor.