| 摘要 |
PURPOSE:To eliminate an offset adjustment by composing the current command generator of a synchronous AC servo unit in a circuit configuration of a resolver and a digital IC. CONSTITUTION:A reference signal generator 1 generates a resolver exciting signal generating clock pulse S1, and inputs it to a counter 2. The counted pulses are stored in advance as the address of a ROM 3 and output as a resolver exciting signal to excite a resolver 6 through D/A converters 4, 5. A sine wave signal is induced in the rotor winding of the resolver 6, and a signal S3 is input through a zero-crossing circuit 7 to a latch 8 and a timing circuit 9. The timing circuit 8 generates a latch pulse signal S4, a latch 10 outputs rotor position information of the resolver 6, and outputs differential information to a subtractor 11. Data corresponding to the differential information is stored in advance in a ROM 12, and rotor speed information is read with it as an address. |
