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    Sensorless Control of Switched Reluctance Machines for Low Speeds and Standstill
    12.
    发明申请
    Sensorless Control of Switched Reluctance Machines for Low Speeds and Standstill 审中-公开
    用于低速和静止的开关磁阻机的无传感器控制

    公开(公告)号：US20150381087A1

    公开(公告)日：2015-12-31

    申请号：US14314510

    申请日：2014-06-25

    Applicant: Caterpillar Inc.

    Inventor： Seok-hee Han ,  Carlos Nino Baron ,  Jackson Wai ,  Ahmed Khalil ,  Ernesto Inoa ,  Jesse Gerdes ,  James Michael Thorne

    IPC: H02P6/18

    CPC classification number: H02P6/185 ,  H02P6/18 ,  H02P25/08 ,  H02P25/089 ,  H02P27/06

    Abstract: A method for determining rotor position of a switched reluctance (SR) machine having a rotor and a stator is provided. The method may include injecting a test pulse into one or more idle phases of the SR machine, determining a decoupled flux value based at least partially on a total flux value corresponding to the test pulse and a mutual flux value, and determining the rotor position based at least partially on the decoupled flux value.

    Abstract translation: 提供了一种用于确定具有转子和定子的开关磁阻（SR）机器的转子位置的方法。 该方法可以包括将测试脉冲注入到SR机器的一个或多个空闲阶段中，至少部分地基于对应于测试脉冲的总通量值和相互通量值来确定解耦通量值，并且基于转子位置确定 至少部分地取决于解耦通量值。

    Enforced zero voltage loop
    13.
    发明授权
    Enforced zero voltage loop 有权
    强制零电压回路

    公开(公告)号：US09099954B2

    公开(公告)日：2015-08-04

    申请号：US13951068

    申请日：2013-07-25

    Applicant: Caterpillar, Inc.

    Inventor： Jackson Wai ,  Ahmed Khalil ,  Carlos Nino Baron ,  Jesse Gerdes ,  Brad A Kough

    IPC: H02P1/00 ,  H02P3/00 ,  H02P27/06

    CPC classification number: H02P27/06 ,  H02P25/0925

    Abstract: A method of controlling a motor is provided. The method may determine one of a switching period, a fundamental cycle, and a current target per phase leg of the motor having at least one high voltage transition point; determine a dwell period to be enforced at the transition point between an engagement of a first switch of the phase leg and an engagement of a second switch of the phase leg where each of the first switch and the second switch may be selectively engageable between a first state and a second state; engage the first switch from the first state to the second state at the transition point; and engage the second switch from the first state to the second state after the transition point and upon expiration of the dwell period.

    Abstract translation: 提供一种控制电动机的方法。 该方法可以确定具有至少一个高电压转变点的电动机的开关周期，基本周期和每相支路的当前目标之一; 确定在所述相腿的第一开关的接合和所述相腿的第二开关的接合之间的过渡点处的停留时段，其中所述第一开关和所述第二开关中的每一个可以选择性地接合在第一 状态和第二状态; 在转换点将第一开关从第一状态转移到第二状态; 并且在转换点之后并且在停留时段期满时将第二开关从第一状态转移到第二状态。

    Switched reluctance initial rotor position estimation
    14.
    发明授权
    Switched reluctance initial rotor position estimation 有权
    开关磁阻初始转子位置估计

    公开(公告)号：US08866433B2

    公开(公告)日：2014-10-21

    申请号：US13664623

    申请日：2012-10-31

    Applicant: Caterpillar Inc.

    Inventor： Jesse Gerdes ,  Jackson Wai ,  Mark Hartman ,  Ahmed Khalil ,  Carlos Nino Baron

    IPC: H02P6/00 ,  H02P6/18 ,  H02P25/08

    CPC classification number: H02P6/182 ,  H02P25/083 ,  H02P25/089 ,  H02P2203/01 ,  H02P2203/03

    Abstract: A method of estimating an initial rotor position of a switched reluctance (SR) machine having a rotor and a stator is provided. The method may comprise the steps of driving a phase current in each of a plurality of phases of the SR machine to a predefined limit, performing an integration of a common bus voltage associated with each phase, determining a flux value for each phase based on the integrations, and determining the initial rotor position based on the flux values.

    Abstract translation: 提供了一种估计具有转子和定子的开关磁阻（SR）机器的初始转子位置的方法。 该方法可以包括以下步骤：将SR机器的多个相位中的每一相中的相电流驱动到预定义的极限，执行与每个相位相关联的公共总线电压的积分，基于该相位确定每个相位的磁通值 并且基于通量值确定初始转子位置。

    Modified flux observer for switched reluctance machines
    15.
    发明授权
    Modified flux observer for switched reluctance machines 有权

    公开(公告)号：US10938332B1

    公开(公告)日：2021-03-02

    申请号：US16594797

    申请日：2019-10-07

    Applicant: Caterpillar Inc.

    Inventor： Ahmed Khalil ,  James Thorne ,  Jackson Wai ,  Amara Ashfaq ,  Jesse Gerdes

    IPC: H02P25/08 ,  H02P25/092 ,  H02P23/14 ,  H02P25/089 ,  H02P9/00

    Abstract: A control system that includes a converter circuit and a control device is disclosed. The converter circuit may be configured to control a phase current of a switched reluctance machine. The control device may be configured to determine an estimated flux based on a bus voltage, a phase voltage, and a mutual voltage. The control device may be configured to determine a flux threshold based on the phase current, and determine a first limit and a second limit relative to the flux threshold. The first limit and the second limit may be scaled relative to the flux threshold based on one or more of the target speed, the load demand, or the bus voltage. The control device may be configured to compare the estimated flux with the first limit, and reset the estimated flux to the second limit based on determining that the estimated flux satisfies the first limit.

    System and Method to Control a Switched Reluctance Machine in Continuous Conduction
    16.
    发明申请
    System and Method to Control a Switched Reluctance Machine in Continuous Conduction 有权
    控制连续传导中开关磁阻机的系统和方法

    公开(公告)号：US20160087570A1

    公开(公告)日：2016-03-24

    申请号：US14492988

    申请日：2014-09-22

    Applicant: Caterpillar Inc.

    Inventor： Jackson Wai ,  Carlos Nino Baron ,  Jesse Gerdes ,  Ahmed Khalil

    IPC: H02P25/08

    CPC classification number: H02P25/08 ,  B60L15/007 ,  B60L2200/36 ,  B60L2200/40 ,  B60L2220/18 ,  B60L2240/421 ,  B60L2240/423 ,  B60L2240/526 ,  H02P25/083 ,  Y02T10/644 ,  Y02T10/645 ,  Y02T10/7258 ,  Y02T90/16

    Abstract: A control system for a switched reluctance (SR) machine is disclosed. The SR machine may have a rotor and a stator. The control system may have a converter circuit operatively coupled to the stator and including a plurality of gates in selective communication with each phase of the stator, and a controller in communication with each of the stator and the converter circuit. The controller may be configured to command a fixed dwell of a theta-on angle and a theta-off angle and a varying current command to the plurality of gates when the SR machine is in a continuous conduction mode.

    Abstract translation: 公开了一种用于开关磁阻（SR）机器的控制系统。 SR机器可以具有转子和定子。 控制系统可以具有可操作地耦合到定子并且包括与定子的每个相位选择性地连通的多个栅极的转换器电路以及与每个定子和转换器电路连通的控制器。 控制器可以被配置为当SR机器处于连续导通模式时，将θ-on角度和θ-off角度以及变化电流指令的固定驻留命令给多个门。

    Current Profile Strategy for Minimizing Torque Ripple and Current
    17.
    发明申请
    Current Profile Strategy for Minimizing Torque Ripple and Current 有权
    最小化扭矩波纹和电流的当前轮廓策略

    公开(公告)号：US20150318806A1

    公开(公告)日：2015-11-05

    申请号：US14266110

    申请日：2014-04-30

    Applicant: CATERPILLAR INC

    Inventor： Jackson Wai ,  Carlos Nino Baron ,  Jesse Gerdes ,  Ernesto Inoa ,  Ahmed Khalil

    IPC: H02P6/10

    CPC classification number: H02P25/098 ,  B62D5/046 ,  H02K29/08 ,  H02P6/10 ,  H02P6/14 ,  Y02T10/7258

    Abstract: A method of controlling an electric motor may include determining a desired torque at the electric motor. A current at a first phase of the electric motor may be calculated at a controller. The calculated current may be a current that results in supplying the desired torque at the electric motor. The controller may compare the calculated current to a predetermined threshold current, and when the calculated current is greater than the predetermined threshold current, the controller may reduce the calculated current to the predetermined threshold current and adjust a current in a second phase adjacent to the first phase of the electric motor to continue to supply the desired torque at the electric motor.

    Abstract translation: 控制电动机的方法可以包括确定电动机的期望转矩。 可以在控制器处计算电动机的第一阶段的电流。 计算出的电流可以是导致在电动机上提供期望转矩的电流。 控制器可以将计算的电流与预定的阈值电流进行比较，并且当所计算的电流大于预定的阈值电流时，控制器可以将计算出的电流减小到预定的阈值电流，并且调节与第一 电动机的相位继续在电动机上提供期望的转矩。

    Pulse injection current pattern for rotor position estimation
    20.
    发明授权
    Pulse injection current pattern for rotor position estimation 有权

    公开(公告)号：US10079566B1

    公开(公告)日：2018-09-18

    申请号：US15649778

    申请日：2017-07-14

    Applicant: Caterpillar Inc.

    Inventor： Ahmed Khalil ,  Seok-Hee Han ,  Jackson Wai ,  James Michael Thorne ,  Jesse Gerdes ,  Sangameshwar Sonth

    IPC: H02P6/00 ,  H02P25/08 ,  H02P6/18

    CPC classification number: H02P25/08 ,  H02P6/18 ,  H02P6/183

    Abstract: A system and method for estimating a position and a speed of a rotor of a Switched Reluctance (SR) machine is provided. The SR machine comprises the rotor, a stator and at least one winding. The method includes generating a diagnostic pulse having a trapezoidal shape. The method further includes injecting a diagnostic pulse into the at least one winding of the SR machine. The method further includes measuring an actual stator current flowing through the at least one winding of the SR machine. The method further includes computing an estimated stator current flowing through the at least one winding using observer-based estimation technique. The estimated stator current is compared with the actual stator current to compute an error signal. At least one of the position and the speed of the rotor is estimated based on the error signal.

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