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By Mo Tor Efficiency


full battery voltage to the motor terminals and the vehicle speed can be controlled by variation of the field current. Yet the use of a multi-speed gearbox has the following ad-vantages (Fig. 8):- during the starting phase a higher gear ratio can be enga-ged, which reduces the initial current drawn from the bat-tery- with the possibility of selecting different gear ratios it is ea-sier to meet demands for hill climbing- since separately excited dc motors are less efficient at low rotational speeds, variable gear ratios allow highly effi-cient motor operation. A thyristor chopper for the armature circuit is being deve-loped which will control the Siemens motor coupled to eit-her the step-down gear or the automatic gearbox. The efficiency of these approaches appears to be high, since the losses in the motor controller are small and regenerative braking is possible. Other advantages are operational com-fort and acceptable range. A disadvantage of these drive sys-tems is the costly armature controller, which must be able to handle currents up to the 350 Ampere

Year: 2000
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