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15 条记录 (耗时 0.017 秒)

    Acceleration method for V/F controlled induction motor in flux-weakening region
    2.
    发明授权
    Acceleration method for V/F controlled induction motor in flux-weakening region 有权

    公开(公告)号：US10340776B2

    公开(公告)日：2019-07-02

    申请号：US15506785

    申请日：2015-08-25

    申请人： Eaton Corporation ,  Zhejiang University

    发明人： Kevin Lee ,  Kai Wang ,  Wenxi Yao

    IPC分类号： H02P1/16 ,  H02P1/28 ,  H02P1/30 ,  H02P1/38 ,  H02K17/02 ,  H02P23/00 ,  H02P27/04 ,  H02P103/10

    摘要： 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.

    SYSTEM AND METHOD FOR OPERATING A THREE-PHASE LOAD FROM A SINGLE PHASE SOURCE
    3.
    发明申请
    SYSTEM AND METHOD FOR OPERATING A THREE-PHASE LOAD FROM A SINGLE PHASE SOURCE 有权

    公开(公告)号：US20170170753A1

    公开(公告)日：2017-06-15

    申请号：US14969872

    申请日：2015-12-15

    申请人： Zhejiang University ,  Eaton Corporation

    发明人： Huaqiang Li ,  Wenxi Yao ,  Zhengyu Lu

    IPC分类号： H02P1/26 ,  H02P27/06

    CPC分类号： H02P1/265 ,  H02M5/00 ,  H02P27/06

    摘要： 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.

    System and method for stability control in adjustable speed drive with DC link thin film capacitor
    5.
    发明授权
    System and method for stability control in adjustable speed drive with DC link thin film capacitor 有权

    公开(公告)号：US10333444B2

    公开(公告)日：2019-06-25

    申请号：US15692898

    申请日：2017-08-31

    申请人： Eaton Corporation ,  Zhejiang University

    发明人： Huaqiang Li ,  Wenxi Yao ,  Zhentian Qian

    IPC分类号： H02P21/05 ,  H02P21/16 ,  H02P25/024 ,  H02P27/12 ,  G05B19/416 ,  G06F17/13

    摘要： A control system for actively damping an output of an adjustable speed drive (ASD) having a DC link thin film capacitor is programmed to calculate a d-axis damping coefficient and a q-axis damping coefficient for stabilizing an output of the ASD based at least on a voltage across the DC link thin film capacitor at a steady operating point. The control system is further programmed to extract d-axis and q-axis perturbations in d-axis and q-axis output currents of the ASD using a high pass filter, damp the d-axis perturbation and the q-axis perturbation with the d-axis damping coefficient and the q-axis damping coefficient, respectively, and calculate a damping frequency based on the damped d-axis perturbation and the damped q-axis perturbation. The control system is also programmed to damp an angle of rotation of a reference motor speed command for controlling the ASD using the damping frequency.

    Dynamic performance and active damping methods in web winder tension control systems
    6.
    发明授权
    Dynamic performance and active damping methods in web winder tension control systems 有权

    公开(公告)号：US10377598B2

    公开(公告)日：2019-08-13

    申请号：US15435549

    申请日：2017-02-17

    申请人： Eaton Corporation ,  Zhejiang University

    发明人： Huaqiang Li ,  Wenxi Yao ,  Fayi Chen ,  Zhengyu Lu

    IPC分类号： B65H23/04 ,  B65H23/06 ,  B65H23/10 ,  B65H23/18 ,  B65H23/195

    摘要： A control system for controlling operation of main and secondary drive units in a web winder system to provide tension control of a continuous material web is disclosed. The control system causes the main drive unit to operate in a velocity mode to set a linear velocity of the continuous material web. The control system receives inputs from tension and speed detectors in the web winder system that detect a tension and speed of the continuous material web and causes the secondary drive unit to operate in a modified torque regulated closed-loop tension control mode so as to control a tension in the web material, with the control system causing the secondary drive unit to operate according to a torque regulated closed-loop tension control mode and integrate a speed feedback loop into the torque regulated closed-loop tension control mode so as to introduce active damping into the tension control.

    System and method for operating a three-phase load from a single phase source
    7.
    发明授权
    System and method for operating a three-phase load from a single phase source 有权

    公开(公告)号：US09667177B1

    公开(公告)日：2017-05-30

    申请号：US14969872

    申请日：2015-12-15

    申请人： Eaton Corporation ,  Zhejiang University

    发明人： Huaqiang Li ,  Wenxi Yao ,  Zhengyu Lu

    IPC分类号： H02P1/26 ,  H02P27/06

    CPC分类号： H02P1/265 ,  H02M5/00 ,  H02P27/06

    摘要： 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.

    System and method of rotor time constant online identification in an AC induction machine
    9.
    发明授权
    System and method of rotor time constant online identification in an AC induction machine 有权

    公开(公告)号：US09525377B2

    公开(公告)日：2016-12-20

    申请号：US14703554

    申请日：2015-05-04

    申请人： Eaton Corporation

    发明人： Kai Wang ,  Wenxi Yao ,  Huaqiang Li ,  Zhengyu Lu

    IPC分类号： H02P21/08

    CPC分类号： H02P21/08 ,  H02P21/13 ,  H02P21/16

    摘要： 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.

    System and method of rotor time constant online identification in an AC induction machine
    10.
    发明授权
    System and method of rotor time constant online identification in an AC induction machine 有权
    交流感应电机的转子时间常数在线识别系统及方法

    公开(公告)号：US09024569B2

    公开(公告)日：2015-05-05

    申请号：US13929914

    申请日：2013-06-28

    申请人： Eaton Corporation

    发明人： Kai Wang ,  Wenxi Yao ,  Huaqiang Li ,  Zhengyu Lu

    IPC分类号： H02P23/00 ,  H02P21/14

    CPC分类号： H02P21/08 ,  H02P21/13 ,  H02P21/16

    摘要： 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.

    摘要翻译： 公开了一种用于确定AC感应电机的转子时间常数的系统和方法。 在感应电动机的操作期间，将磁通信号注入到转子磁通指令中，以产生时变转子磁通。 电压 - 电流通量观测器确定由时变转子磁通产生的转子磁通变化的幅度，转子磁通量变化的幅度基于电压 - 电流通量观测器的当前模型，包括转子磁通量变化的幅度，以及 基于电压 - 电流通量观测器的组合电压 - 电流模型的转子磁通量变化幅度。 然后基于所确定的转子磁通变化的幅度来估计感应电动机的转子时间常数。