| 摘要 |
A control system for a synchronous motor which is employed as a servomotor, wherein a pulse coder is employed for detection of the absolute position of one of the field poles of the motor, the absolute position being a component of the input signals for generating a poly-phase alternating current voltage which generates a rotating field maintaining a fixed amount of phase difference with respect to the absolute position of one of the field poles of the motor, thereby the synchronous motor is controlled to run maintaining a fixed amount of internal phase angle of e.g. pi /2 for the entire operation period, wherein the improvement is that the pulse coder has two pulse coder elements, one of which detects the absolute position of one of the field poles of the motor and the other of which generates incremental pulses during each interval of the signals representing the absolute position of one of the field poles, thereby a larger amount of resolving power is realized for the pulse coder, ultimately improving the performance of the control system.
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