| 摘要 |
PURPOSE:To obtain the stable rotation of a commutatorless motor by discriminating the rotating direction by the output of a speed control amplifier for amplifying the difference signal between a tachometer generator signal and a speed command signal and controlling an armature winding drive element by the discriminated output. CONSTITUTION:A difference signal between a speed signal from a tachometer generator 18 from an adder 19 and a speed command signal is amplified by a speed control amplifier 20, and its absolute value is produced by an absolute value circuit 21. The difference between the output of the circuit 21 and the output of an armature current detector 22 is produced by an adder 23, and a main switching transistor 25 is PWM-controlled by a PWM-control circuit 24 which inputs the difference signal. The output of a discriminator 28 which discriminates the rotating direction by the output of the amplifier 20 is inputted together with the output of a position detecting Hall elements 2, 3 to a converter 29, switching transistors 8-11 are controlled by the output of the converter 29 to rotate a motor and to determine the rotating direction. |
