公开(公告)号：US20150236631A1

公开(公告)日：2015-08-20

申请号：US14703554

申请日：2015-05-04

Applicant: Eaton Corporation

Inventor： Kai Wang ,  Wenxi Yao ,  Huaqiang Li ,  Zhengyu Lu

IPC: H02P21/08

CPC classification number: H02P21/08 ,  H02P21/13 ,  H02P21/16

Abstract: A system and method for determining a rotor time constant of an AC induction machine is disclosed. During operation of the induction motor, a flux signal is injected into a rotor flux command so as to generate a time-variant rotor flux. A voltage-current flux observer determines amplitudes of rotor flux variations resulting from the time-variant rotor flux, with the amplitudes of the rotor flux variations comprising an amplitude of a rotor flux variation based on a current model of the voltage-current flux observer and an amplitude of a rotor flux variation based on a combined voltage-current model of the voltage-current flux observer. A rotor time constant of the induction motor is then estimated based on the determined amplitudes of the rotor flux variations.

公开(公告)号：US08994320B2

公开(公告)日：2015-03-31

申请号：US13931121

申请日：2013-06-28

Applicant: Eaton Corporation

Inventor： Yaojin Mo ,  Huaqiang Li ,  Anbo Yu ,  Dawei Li ,  Jingfeng Xie

IPC: H02P23/00

CPC classification number: H02P27/06 ,  H02M2007/53876 ,  H02P3/18 ,  H02P21/0021 ,  H02P23/00 ,  H02P23/20 ,  H02P23/28 ,  H02P27/047 ,  H02P29/0241

Abstract: A system and method for controlling an adjustable speed drive (ASD) to decelerate an AC load during a generating mode of operation is disclosed. The ASD includes a capacitor and an inverter coupled to a DC link. A current sensor system is coupled to an output of the inverter. The ASD further includes a control system programmed to calculate an energy of the capacitor, generate a reference power using the calculated capacitor energy, and calculate a feedback power from realtime current signals received from the current sensor system. The control system compares the feedback power to the reference power, defines a frequency offset based on the comparison, generates a speed command using the frequency offset, and outputs the speed command to the inverter to maintain a smooth DC link voltage during deceleration.

Abstract translation: 公开了一种用于控制可调速驱动器（ASD）以在生成操作模式期间减速AC负载的系统和方法。 ASD包括耦合到DC链路的电容器和反相器。 电流传感器系统耦合到逆变器的输出端。 ASD还包括被编程为计算电容器的能量的控制系统，使用所计算的电容器能量产生参考功率，以及从当前传感器系统接收的实时电流信号计算反馈功率。 控制系统将反馈功率与参考功率进行比较，根据比较定义频率偏移，使用频率偏移生成速度指令，并将速度指令输出到变频器，以在减速期间保持平稳的直流母线电压。

公开(公告)号：US08988035B2

公开(公告)日：2015-03-24

申请号：US13720668

申请日：2012-12-19

Applicant: Eaton Corporation

Inventor： Kai Wang ,  Wenxi Yao ,  Huaqiang Li ,  Zhengyu Lu

IPC: H02P23/14 ,  H05K13/00 ,  H02P21/14 ,  G01R31/34

CPC classification number: H02P23/14 ,  G01R31/34 ,  H02P21/16 ,  H05K13/00 ,  Y10T29/49004

Abstract: A system for identifying magnetizing inductance and rotor resistance of an induction machine comprises an induction machine comprising a rotor and a stator, a DC voltage bus, and a DC-to-AC voltage inverter coupled to the DC voltage bus and to the induction machine. The system also comprises a controller configured to cause the DC-to-AC voltage inverter to apply a square-wave excitation to a plurality of phases of the induction machine, determine a stator resistance of the stator of the induction machine based on the square-wave excitation, and determine a rotor resistance of the rotor of the induction machine based on the square-wave excitation. The controller is also configured to calculate a magnetizing curve for the induction machine based on the stator and rotor resistances and control the induction machine to operate based on the magnetizing curve.

Abstract translation: 用于识别感应电机的磁化电感和转子电阻的系统包括感应电机，其包括转子和定子，DC电压总线以及耦合到DC电压总线和感应电机的DC至AC电压逆变器。 该系统还包括控制器，其被配置为使得直流到交流电压逆变器对感应电机的多个相位施加方波激励，基于平方英寸来确定感应电机的定子的定子电阻， 基于方波激励确定感应电机转子的转子电阻。 控制器还被配置为基于定子和转子电阻计算感应电机的磁化曲线，并且基于磁化曲线控制感应电机的操作。