| 摘要 |
PROBLEM TO BE SOLVED: To provide a speed control motor, in which the drive signal of a rotary motor is separated electrically from the speed signal of the motor, in which a sufficient feedback amount can be ensured and which can obtain stable performance. SOLUTION: This speed control motor A provided is equipped with a rotary motor 5, by which a drive force is controlled according to an input signal. The speed control motor is equipped with a position detector 29a and a position detector 29b which are arranged, in such a way that the rotational position of the motor 5 is detected and that position signals are output in waveforms at different phases. The speed control motor is equipped with a differential part 301a and a differential part 301b, which differentiate the respective position signals and which generate signals containing speed components according to the rotational speed of the motor 5. The speed control motor is equipped with a speed detection part 5, where a polarity conversion part by which polarities of the individual signals containing the speed components are inverted or not inverted on the basis of the position signals is provided, and an addition part 39 in which the inverted or noninverted signals are added, so as to output the rotational-speed signal of the motor 5 is provided. The speed control motor is equipped with a comparison part 13, in which the rotational-speed signal to be output by the addition part 39 is compared with a prescribed reference speed signal, so as to output the compared result as the input signal of the motor 5. |
