| 摘要 |
<p>Traction equipment comprises a vehicle F with an electric a.c. motor M and with an accumulator battery B for feeding the motor via an inverter VR. The vehicle is provided with means, such as a switch SW and a plug AM, for connecting the a.c. side of the inverter to a stationary a.c. voltage source TR for charging the battery via the inverter. In addition, the vehicle has means such as a charging regulator CR, a comparison circuit JF, a current regulator IR, amplifiers FR-FT, delay devices DR-DT and a potentiometer P, for controlling the inverter and thus the charging current while charging the battery. Members FR-FT, DR-DT are responsive to voltages URUSUT of the source TR to control the phase position of the inverter voltage relative to the voltage of source TR. Potentiometer P is adjusted to minimize the reactive power between the inverter and source TR while charging the battery. A time programme may control the charge current instead of sensing the battery voltage by potentiometer SD. <IMAGE></p> |
