| 摘要 |
PURPOSE:To reliably provide rapid starting characteristic by gradually shortening the driving period of a pole for the prescribed period after starting a motor. CONSTITUTION:A clock signal divided by 8 in frequency is inputted to the clock input CK of a quaternary counter 7 in the initial state, and counting is started. When a motor 11 finishes one revolution, a carry C is outputted from the counter 7 to a counter 6. The output Z of a multiplexer becomes X2 by the output of the counter 6. The counter 7 counts a signal X2, rotates the motor 11 in response to it, and when the rotation is finished, the multiplexer 5 outputs a signal X3 from the carry C12 this time. The motor 11 is gradually accelerated, the output Z of the multiplexer 5 outputs a signal X4 by the carry C, and the counter 7 then periodically counts by the signal X4 to normally rotate the motor 11. |
