| 摘要 |
<p>PURPOSE:To provide a superiority of speed up-down characteristic, by means of supplying a servo error signal, as it is, always to the motor, with an output of complementary circuit so processed a negative feed-back to the amplifier. CONSTITUTION:Between an input terminal 3 and transistors 4, 5, that are constituting a complementary circuit, is provided an amplifier 7. And an output side of the complementary circuit is connected to a negative terminal of the amplifier 7 through a resistor 8, with a positive terminal of the amplifier 7 connected to the input terminal 3. With a servo error signal fed to the input terminal 3, when an output signal of the amplifier 7 is positive, a NPN transistor 4 is turned on to decelerate a motor 2, and when the output signal is negative, a PNP transistor 5 is turned on to accelerate the motor 2. With a common connection point of each emitter of the transistors 4, 5 being connected to the negative terminal of the amplifier 7 through the resistor 8, VBE of the transistor 4, 5 will be absorbed by a negative feed-back loop.</p> |
