| 摘要 |
PURPOSE:To reduce the capacity of a memory required for finding the period of a synchronizing signal and, at the same time, to reduce calculating time in a driving device which is constituted to generate the driving signal of an inverter based on the synchronizing signal during a fixed period of time after a start command and based on the position detecting signal of a magnet rotor thereafter. CONSTITUTION:The initial value of a synchronizing signal and a fixed subtracting value are stored in a memory 103 and a timer 102 counts a period calculated by a different calculating means 101. A synchronizing signal outputting means 104 outputs the synchronizing signal of the period calculated by the means 101 and the means 101 first sets the period to the initial value and, thereafter, successively updates the set value of the period to values obtained by subtracting the subtracting value from the period of the outputted synchronizing signal whenever the period has elapsed. Since the period can be found by performing simple calculation of subtracting the subtracting value only, the calculating time can be reduced and the capacity of the memory 103 can also be reduced, because the memory 103 is used for storing the initial and subtracting values only. |
