公开(公告)号：US20170257041A1

公开(公告)日：2017-09-07

申请号：US15506785

申请日：2015-08-25

Applicant: Kevin LEE ,  Kai WANG ,  Wenxi YAO ,  Eaton Corporation

Inventor： Kevin Lee ,  Kai Wang ,  Wenxi Yao

IPC: H02P1/16 ,  H02P1/28 ,  H02K17/02 ,  H02P1/30 ,  H02P1/38

CPC classification number: H02K17/02 ,  H02P1/28 ,  H02P1/30 ,  H02P23/0031 ,  H02P27/047 ,  H02P2103/10

Abstract: The present invention provides an acceleration method for V/f controlled induction motor in flux-weakening region, which comprises: acquiring no-load magnetizing current Im of the induction motor at current stator frequency; selecting a smaller one of 0.5·Im(1/σ+1) and (Im2+σ)/(Im+σIm) as magnetizing current set point, in which σ is an estimated total leakage inductance coefficient; getting an error signal by subtracting the magnetizing current of the induction motor from the magnetizing current set point; determining the stator frequency for the next control period according to the error signal which is provided as a controlling variable of negative feedback. The acceleration method of the present invention can provide the maximum output torque in flux-weakening region and has a larger tolerance for the error of the estimated leakage inductance.

公开(公告)号：US09667177B1

公开(公告)日：2017-05-30

申请号：US14969872

申请日：2015-12-15

Applicant: Eaton Corporation ,  Zhejiang University

Inventor： Huaqiang Li ,  Wenxi Yao ,  Zhengyu Lu

IPC: H02P1/26 ,  H02P27/06

CPC classification number: H02P1/265 ,  H02M5/00 ,  H02P27/06

Abstract: A power converter for operating a three-phase AC electrical machine from a single phase AC power source includes an ASD having a rectifier and inverter, and an add-on power conversion module external to the ASD that is electrically connected to each of the power source and the ASD. The power conversion module includes one or more input inductors configured to store and filter single-phase AC power received from the power source and a pair of switching devices connected to each of the input inductors at an output end thereof. A controller operably connected to the power conversion module selectively controls switching of the pair of switching devices associated with each of the one or more input inductors so as to cause a sinusoidal single phase AC power to be output from the add-on power conversion module for rectification by the rectifier.

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：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。