| 摘要 |
PURPOSE:To reduce pulsation of motor current and stringing current considerably by controlling two sets of transistor choppers with 180 deg. phase difference. CONSTITUTION:In the resistors 7-9; 10-12 for controlling the currents flowing through series motors 3, 4; 5, 6, the resistors 7, 8; 10, 11 are connected in parallel with transistor switches 13, 14; 16, 17 while the resistors 9, 12 are connected in parallel with transistor choppers 15, 18. Two sets of transistor choppers 15, 18 are controlled with 180 deg. phase difference. Pulsation of stringing current is suppressed as much as possible because it causes radio wave trouble and the level thereof is kept constant regardless of connection of a motor circuit. By such arrangement, pulsation of motor current and stringing current can be reduced considerably. |
