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    • 1. 发明授权
    • Control system for induction motor driven electric car
    • 感应电动机驱动电动汽车控制系统
    • US4825131A
    • 1989-04-25
    • US115038
    • 1987-10-30
    • Yoshio NozakiShigetoshi OkamatsuTadashi Takaoka
    • Yoshio NozakiShigetoshi OkamatsuTadashi Takaoka
    • B60L9/18B60L9/22B60T8/17G01P3/42H02P27/06B61C15/08
    • B60T8/1705B60L9/22B60L2200/26B60L2220/12B60T2270/602Y02T10/7258
    • A DC voltage on an electric car stringing is supplied to a variable voltage and variable frequency PWM inverter so as to be converted into a three-phase alternating current which is supplied to a plurality of three-phase induction motors. The motors are connected to different wheels to drive an electric car. The inverter is controlled on the basis of an operating frequency command determined by adding or subtracting a slip frequency command to or from a motor speed and a voltage command proportional to the operating frequency command. On the other hand, a motor current command is set and compared with a maximum current value of currents of the plurality of motors, and the slip frequency command is corrected in accordance with a difference therebetween. In a constant torque region of the electric car, a correction value increasing in proportion to the speed is then added to the motor current command, so that torque of motors other than a motor to which the maximum current flows compensates for a decrease in torque caused as the speed increases to improve constant torque characteristics.
    • 将电动车串联的直流电压提供给可变电压和可变频率的PWM逆变器,以便转换为提供给多个三相感应电动机的三相交流电。 电动机连接到不同的车轮以驱动电动汽车。 基于通过向电动机速度加上或减去转差频率指令而确定的运行频率指令来控制逆变器,以及与运转频率指令成正比的电压指令。 另一方面,设定电动机电流指令并与多个电动机的电流的最大电流值进行比较,并且根据它们之间的差异校正转差指令。 在电动汽车的恒转矩区域中,与电动机电流指令成比例地增加与速度成比例地增加的校正值,使得除最大电流流动的电动机以外的电动机的转矩补偿转矩的降低 随着速度的增加,可以提高恒转矩特性。