| 摘要 |
PURPOSE:To perform smooth speed control of an electric motor from high speed to low speed by generating a pulse signal in relation to the number of revolution of a motor by a pulse generator to compare with a signal of a standard speed generator which changes the speed in multistage manner. CONSTITUTION:A speed order signal, selected at a rotary switch 14 of a speed selection circuit 1, is input into a memory device 23 of a speed control circuit 4 through an encoder 15 of a speed signal generating circuit 2. Also, the pulse in relation to the actual speed of the motor can be had by a pulse generator 16 to be input into a deduction counter 17 whose output is input into another deduction counter 24 through a logical operation circuit. At the deduction counter 24 is operated a fixed calculation with the output in from the memory circuit 23, whose output signal is input into a motor driving circuit 5 through an OR circuit 26, the flip-flop FF2, FF3. A switching circuit 32 produces a fixed motor driving signal. |
