| 摘要 |
PURPOSE:To obtain a rotary position showing no variation due to a rotational speed, by detecting the phase difference between the exciting signal and inducing signal of a synchronous motor and also detecting the detection time thereof to perform the predictive operation of the rotary position at an arbitrary time. CONSTITUTION:A clock pulse is counted by a counter circuit 2 to be inputted to a function circuit 3 and becomes the two-phase sine wave signal corresponding to the count value to excite a synchronous motor 4. Voltage having the phase corresponding to a rotary position is outputted from a secondary winding to be converted to a square wave by an FF circuit 7 and the count value is latched at the rising of said square wave by a latch circuit 9 to latch the rotary position and a detection time. The data of the circuit 9 is transmitted to a latch circuit 14 at the rising of the FF circuit 12 and the rotary position and detection time before one time are transmitted to a latch circuit 15 from a latch circuit 11. Further, the count values of the counter circuits 10, 2 are latched by a latch circuit 13. A microcomputer 16 successively read these data to perform a predictive operation.
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