| 摘要 |
The pantograph has an electronic system to control its contact relative to its base. Three Hall Effect Sensors, L, C and R are fitted underneath the contact to measure the magnetic field from a live overhead wire. The voltages from the sensors are fed into three voltage comparators, LC, RC and LR. The outputs from the voltage comparators control relay switches in the circuit of a two-way electric motor, which moves the pantograph contact from side to side to align it centrally underneath the live wire. |
