公开(公告)号：US4675799A

公开(公告)日：1987-06-23

申请号：US538788

申请日：1983-10-04

申请人： Masato Suzuki ,  Hiroshi Narita ,  Shigetoshi Okamatsu ,  Kingo Abe

发明人： Masato Suzuki ,  Hiroshi Narita ,  Shigetoshi Okamatsu ,  Kingo Abe

IPC分类号： H02M7/515 ,  H02M7/525 ,  H02H7/122

CPC分类号： H02M7/525 ,  H02M7/515

摘要： A power converter such as an inverter or chopper using self-turn-off type semiconductor devices supplies power to an inductive load and free wheel diodes are provided so that the current flowing through this load circulates not through the power supply but through the free wheel diodes. When it is detected that the load current exceeds a predetermined value, the self-turn-off-type semiconductors which are conductive are turned off. At this time, the self-turn-off-type semiconductors which are turned on and immediately thereafter cause the recovery current to flow in the free wheel diodes are turned off not immediately but after the recovery current disappears.

摘要翻译： 诸如使用自关断型半导体器件的逆变器或斩波器的功率转换器为感性负载供电并且提供续流二极管，使得流过该负载的电流不是通过电源而是通过续流二极管 。 当检测到负载电流超过预定值时，导通的自关断型半导体被关断。 此时，接通并立即使恢复电流在续流二极管中流动的自关断型半导体不立即关闭，但在恢复电流消失之后。

公开(公告)号：US4785225A

公开(公告)日：1988-11-15

申请号：US105234

申请日：1987-10-07

申请人： Akira Horie ,  Yoshiji Jimbo ,  Kingo Abe ,  Jinkoo Choo ,  Seiki Amikura ,  Yozo Tsuzuki

发明人： Akira Horie ,  Yoshiji Jimbo ,  Kingo Abe ,  Jinkoo Choo ,  Seiki Amikura ,  Yozo Tsuzuki

IPC分类号： B60L9/22 ,  H02P27/04 ,  H02P1/30

CPC分类号： H02P27/08 ,  B60L9/22 ,  B60L2200/26 ,  B60L2210/20 ,  B60L2220/12 ,  Y02T10/725

摘要： A control apparatus for an induction motor comprises a variable voltage, variable frequency inverter feeding the motor, which is controlled by the PWM control. A secondary current component and an exciting current component of the motor are obtained by the calculation on the basis of a motor current and an actual slip frequency of the motor. From the thus obtained secondary current component, an actual torque produced by the motor is calculated. A frequency reference for the PWM control is obtained by the comparison result of the actual torque and a torque reference. A modulation factor reference for the PWM control is obtained by the comparison of the exciting current component and an exciting current reference. According to this control apparatus, the torque of the induction motor can be controlled to follow the torque reference with a high accuracy.

摘要翻译： 用于感应电动机的控制装置包括由PWM控制控制的供电电动机的可变电压变频逆变器。 通过基于电动机电流和电动机的实际转差频率的计算来获得电动机的二次电流分量和励磁电流分量。 从这样获得的二次电流分量，计算由电动机产生的实际转矩。 通过实际转矩和转矩给定的比较结果，可获得PWM控制的频率基准。 通过比较励磁电流分量和励磁电流参考，可获得PWM控制的调制系数参考。 根据该控制装置，能够高精度地控制感应电动机的转矩跟随转矩基准。