| 摘要 |
PROBLEM TO BE SOLVED: To accurately and securely detect abnormality in the driving of a motor coil winding, to securely protect a circuit, and to prevent an obstacle where the motor coil winding is burned out. SOLUTION: In the motor-controlling device, by an H bridge consisting of transistors Tr1 to Tr4, coil windings L1 to L3 of a motor are driven, and at the same time switches SW1 to SW3 for controlling each coil winding are provided. Also, in the motor-controlling device, resistors Ra and Rb for detecting each of the outflow and inflow currents of the H bridge are provided, the detection voltage value of the outflow is compared with that of the inflow by a differential amplifier A3 and a comparator A4, the switches SW1 to SW3 are opened via an RS flip-flop D1 and AND gates G1 to G3 when the difference is larger than a specific voltage, and motor driving operation is urgently stopped. Also, when either detection voltage of the resistor Ra or Rb for detecting the outflow and inflow currents is nearly equal to 0, an H bridge circuit is subjected to emergency stop. |
