| 摘要 |
<p>12K149-325 Motor Monitor Synchronization System A magnetic field motor monitor comprises an analogue-to-digital converter arranged to provide digital representations of instantaneous values of a motor magnetic field to a digital processor. A source of clock pulses provides clock pulses for the processor. The source is synchronised to a repetitive external signal, e.g. line (mains), as follows. A timing pulse is generated after a fixed number of clock pulses and the frequency of the clock pulses provided by the source is controlled in dependence on the time difference between the occurrence of the timing pulse and a fixed part of the cycle of the external signal.</p> |
