公开(公告)号：US06321606B1

公开(公告)日：2001-11-27

申请号：US09349259

申请日：1999-07-08

申请人： Shinichi Ishii ,  Hirokazu Tajima

发明人： Shinichi Ishii ,  Hirokazu Tajima

IPC分类号： G01L302

CPC分类号： H02P21/141 ,  H02P21/10 ,  H02P21/30

摘要： The apparatus calculates a torque that an induction motor generates while considering an iron loss even in a boosting state for exceeding the rated excitation. The calculation is based on a reference voltage value fed to an inverter for driving the induction motor, a q-axis current component and a d-axis current component resolved from a detected current of the induction motor on a rotating coordinate system, a primary resistance of the induction motor and a primary angular frequency. The apparatus includes an iron loss calculator that calculates the iron loss of the induction motor based on hysteresis characteristics of the stator core, a divider that divides the calculated iron loss by the primary angular frequency and an adder that calculates the generated torque by subtracting the result of the division from the torque calculated without considering the iron loss.

摘要翻译： 该装置即使在超过额定励磁的升压状态下也能够考虑感应电动机产生的转矩。 该计算基于馈送到用于驱动感应电动机的逆变器的参考电压值，从旋转坐标系上的感应电动机的检测电流分解的q轴电流分量和d轴电流分量，初级电阻 的感应电动机和主角频率。 该装置包括铁损计算器，该铁损计算器基于定子铁心的滞后特性计算感应电动机的铁损，将计算的铁损除以主角频率的分压器和通过减去结果计算产生的转矩的加法器 的分数从扭矩计算而不考虑铁损。

公开(公告)号：US5828199A

公开(公告)日：1998-10-27

申请号：US908575

申请日：1997-08-08

申请人： Hirokazu Tajima ,  Hidetoshi Umida ,  Hiroshi Tetsutani

发明人： Hirokazu Tajima ,  Hidetoshi Umida ,  Hiroshi Tetsutani

IPC分类号： H02P21/00 ,  H02P21/08 ,  H02P21/14 ,  H02P27/04 ,  H02P7/622

CPC分类号： H02P21/08 ,  H02P21/18 ,  H02P21/26

摘要： A variable speed controller for an induction motor that estimates the primary angular frequency and the speed without causing any error in the drive region where the induced voltage is low. The primary angular frequency and speed estimating device includes: a changeover signal generator that generates a changeover signal indicative of a first mode of operation when the induced voltage is greater than the changeover threshold, and a second mode of operation when the induced voltage is less than the changeover threshold; a differentiator, filter, etc., for estimating the load torque; a sample holder that holds the estimated load torque in the second mode of operation; an adder that generates the acceleration and deceleration torque; an integrator that integrates the acceleration and deceleration torque with the mechanical time constant of the induction motor to obtain the second generated speed; an adder that generates a second primary angular frequency; and an output device that in the first mode of operation outputs the first generated primary angular frequency as the reference primary angular frequency and the first generated speed as the estimated speed, and in the second mode of operation outputs the second generated primary angular frequency as the reference primary angular frequency and the second generated speed as the estimated speed.

摘要翻译： 用于感应电动机的变速控制器，其估计主要角频率和速度，而不会在感应电压低的驱动区域中引起任何误差。 主角频率和速度估计装置包括：切换信号发生器，其在感应电压大于转换阈值时产生指示第一操作模式的转换信号，以及当感应电压小于转换阈值时的第二操作模式 转换阈值 用于估计负载转矩的微分器，滤波器等; 在第二操作模式下保持估计负载转矩的样本保持器; 产生加速和减速转矩的加法器; 积分器，其将加速和减速转矩与感应电动机的机械时间常数相加以获得第二生成速度; 产生第二主角频率的加法器; 以及在第一操作模式下输出第一产生的主角频率作为基准主角频率和第一生成速度作为估计速度的输出装置，并且在第二操作模式中，将第二生成的主角频率作为 参考主角频率和第二生成速度作为估计速度。