In the synchronous motor, the control means may repeatedly control {HEAD ~ the switch} so as to transfer from {TAIL ~ the synchronous operation} to the start operation and transfer to the synchronous operation again when power swing occurs 
to transfer from
In the synchronous motor , the control means may repeatedly control { HEAD ~ the switch } so as to transfer from { TAIL ~ the synchronous operation } to the start operation and transfer to the synchronous operation again when power swing occurs
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH