| 摘要 |
<p>Optimal constructions for two motor/controller configurations (20) are disclosed. The controller structure includes an H-bridge (48) for controlling field current using synchronous-rectification of MOSFET (58, 60, 62, 64) devices, and a circuit for chopping the armature (36) current using synchronous-rectification of MOSFET (44, 46) devices arranged in a half bridge. The controller (20) may be configured with a series-wound or a separately excited DC traction motor. In the series-wound motor/controller configuration, the field (38) and the armature (36) current are separately controlled. In the separately excited motor/controller configuration, the field (38) of the motor is preferably wound so that the rated field current is achieved at about 20 % of the rated battery voltage. This provides a separately excited motor in which the field current can be boosted by a factor of 5 to achieve high start-up and low speed torques which match the torque outputs of a series-wound motor under similar operating conditions.</p> |
