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1. 发明授权

US3845372A Circuit for starting electric motor from standstill with maximum torque 失效
标题翻译：用于以最大扭矩启动电动机的电路
公开(公告)号：US3845372A
公开(公告)日：1974-10-29
申请号：US32661273
申请日：1973-01-26
申请人： ALLIS CHALMERS MFG CO
发明人： GEIERSBACH A , KAESER E , GILMORE T , RINGLAND W , NEUMANN M
IPC分类号： B60K17/04 , B60K17/14 , B60K17/356 , B60L11/08 , F02B3/06 , H02P1/46 , H02P1/04
CPC分类号： B60K17/145 , B60K17/046 , B60K17/356 , B60L11/08 , B60L2220/14 , F02B3/06 , H02P1/46 , Y02T10/646 , Y02T10/648 , Y02T10/70 , Y02T10/7077
摘要： The wheels of a vehicle are driven by synchronous motors energized from cycloconverters controlled by signals of selectively variable magnitude and phase and modulated at motor frequency. The signals for controlling the cycloconverters are generated in the output winding of a rotary vector adder having a pair of ninety-degree displaced energizing windings inductively linked to the output winding. Maximum motor torque is available at start and the displacement angle of the motor voltage is kept to zero and motor voltage is adjusted to a magnitude which will limit motor current to a value not exceeding 125 percent of full load by a current regulated starting circuit having a first operational amplifier which compares a current feedback signal proportional to motor current to a selectively variable power signal proportional to the desired output torque from the motor and set by a foot pedal, a current control amplifier which subtracts a speed signal proportional to motor r.p.m. from the power signal to derive a current control signal which sets maximum motor current, and a variable limit clamping emitter follower which receives the output from the first operational amplifier and provides an output voltage to only one energizing winding of the rotary vector adder and clamps the magnitude of said output voltage to an upper limit which varies with the current control signal so that the voltage applied to the vector adder energizing winding decreases as motor speed increases until the starting circuit output becomes zero at a predetermined motor speed.
摘要翻译：车辆的车轮由同步电动机驱动，该电动机由循环变频器激励，该变频器由选择性可变的幅度和相位的信号控制，并在电动机频率下进行调制。用于控制循环换流器的信号在具有感应地连接到输出绕组的一对九十位置的激励绕组的旋转矢量加法器的输出绕组中产生。最大电动机转矩在起动时可用，电动机电压的位移角度保持为零，电动机电压被调整到一个大小，其将通过电流调节启动电路将电动机电流限制到不超过满负载的125％第一运算放大器，其将与电动机电流成比例的电流反馈信号与来自电动机的期望输出转矩成比例并由脚踏板设定的选择性可变功率信号进行比较;电流控制放大器，其减去与电动机转速成比例的速度信号从电源信号导出设定最大电动机电流的电流控制信号，以及可变限幅钳位射极跟随器，其接收来自第一运算放大器的输出，并向只有一个驱动绕组的旋转矢量加法器提供输出电压，并钳位所述输出电压的大小变化到随着电流控制信号而变化的上限，使得施加到矢量加法器激励绕组的电压随着电动机速度增加而减小，直到起动电路输出在预定电动机速度为零。

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