| 摘要 |
PURPOSE:To improve the damping by making AC voltage to be applied to a servo motor linear near the balanced point in the relationship with a torque. CONSTITUTION:A signal (e) applied to input terminals 11 and 12 is fed to bases of transistors Tr1 and Tr2 while given to the input terminal of an operational amplifier A. The output of the operational amplifier A is applied to bases of transistors Tr3 and Tr4. The collectors of the transistors Tr1 and Tr4 and those of the transistors Tr2 and Tr4 are connected to an exciting winding L2 and a control winding L1 of a servo motor M and an AC power source S is connected to the connection point between the windings L2 and L1. With such an arrangement, an average output voltage to the servo motor M with respect to the input signal (e) changes linearly near the balanced point of zero in the input signal while it is kept at a large level. This improves the damping near the balanced point. |
