| 摘要 |
A motor servo system for controlling a motor includes a first synthesizing portion which synthesizes a speed detection signal and a phase detection signal with each other to produce a synthesized signal which is in turn filtered by a low-pass filter portion and then becomes a first motor control signal. The first motor control signal is applied to an equivalent motor portion (software motor) which is included in an observer and has a transfer function of as the same as that of the motor. A detection signal which is detected by the equivalent motor portion and a synthesized signal from the synthesizing portion are compared with each other by a first comparing portion. An output signal of the first comparing portion is applied to a second comparing portion or a second synthesizing portion. By subtracting an output signal of the first comparing portion from the first motor control signal by the second comparing portion, or by synthesizing the output signal of the first comparing portion from the first motor control signal, a second motor control signal by which the motor is to be controlled.
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