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    Hybrid Hard Chopping and Soft Chopping Current Regulation
    23.
    发明申请
    Hybrid Hard Chopping and Soft Chopping Current Regulation 审中-公开
    混合硬切割和软斩波电流调节

    公开(公告)号：US20160301347A1

    公开(公告)日：2016-10-13

    申请号：US14683610

    申请日：2015-04-10

    Applicant: Caterpillar Inc.

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

    IPC: H02P25/08

    CPC classification number: H02P25/08 ,  H02P23/0027 ,  H02P23/03

    Abstract: A method of regulating a phase current of an electric motor is provided. The method may include selectively enabling one or more switches of each phase of the electric motor according to one of at least a soft chopping motoring routine and a soft chopping generating routine, monitoring the phase current relative to at least one limit of a hysteresis band and a switching period, and controlling the switches according to a hard chopping routine when the phase current does not reach the limit within the switching period.

    Abstract translation: 提供一种调节电动机的相电流的方法。 该方法可以包括根据至少软斩波电动程序和软斩波产生程序中的至少一个选择性地启用电动机的每个相的一个或多个开关，监测相对于滞后带的至少一个极限的相电流，以及 开关周期，并且当相电流在开关周期内未达到极限时，根据硬切断程序来控制开关。

    Vector Currents Controller for Salient Pole Synchronous Machine
    24.
    发明申请
    Vector Currents Controller for Salient Pole Synchronous Machine 审中-公开
    矢量电流控制器用于凸极同步机

    公开(公告)号：US20160276962A1

    公开(公告)日：2016-09-22

    申请号：US14661791

    申请日：2015-03-18

    Applicant: Caterpillar Inc.

    Inventor： Ahmed Khalil ,  Ernesto Inoa ,  Baojun Si ,  Srikar Thaduvayi ,  William J. Tate

    IPC: H02P6/00 ,  H02P6/04 ,  H02P6/08

    CPC classification number: H02P21/22 ,  B60L15/2045 ,  B60L2200/44 ,  B60L2240/421 ,  B60L2240/423 ,  B60L2240/527 ,  H02P21/0089 ,  H02P2006/045 ,  Y02P90/60 ,  Y02T10/643 ,  Y02T10/644 ,  Y02T10/645 ,  Y02T10/72 ,  Y02T10/7283 ,  Y02T90/16

    Abstract: A control system for an alternating current (AC) machine having a rotor and a stator is disclosed. The control system may include a direct current (DC) link providing a variable DC link voltage; an inverter module operatively coupled between the DC link and the AC machine, and a controller in communication with the inverter module. The inverter module may include a plurality of gates in selective communication with each phase of the stator. The controller may be configured to receive a signal indicative of the variable DC link voltage, receive a signal indicative of a rotational speed of the rotor, receive a torque command, and generate a direct-axis current command and a quadrature-axis current command using the variable DC link voltage, the rotational speed, and the torque command as inputs into a three-dimensional lookup table preprogrammed into a memory associated with the controller.

    Abstract translation: 公开了一种具有转子和定子的交流（AC）机器的控制系统。 控制系统可以包括提供可变DC链路电压的直流（DC）链路; 可操作地耦合在DC链路和AC电机之间的逆变器模块，以及与逆变器模块通信的控制器。 逆变器模块可以包括与定子的每个相位选择性地连通的多个门。 控制器可以被配置为接收指示可变直流母线电压的信号，接收指示转子的转速的信号，接收转矩指令，并且使用以下方式生成直轴电流指令和正交轴电流指令： 可变直流链路电压，转速和转矩指令作为预先编程到与控制器相关联的存储器中的三维查找表的输入。

    Switched Reluctance Initial Rotor Position Estimation
    26.
    发明申请
    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：US20140117901A1

    公开(公告)日：2014-05-01

    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: H02P6/18

    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。

    SYNCHRONOUS ELECTRIC MACHINES SELF-SENSING FAULT DETECTION
    27.
    发明申请
    SYNCHRONOUS ELECTRIC MACHINES SELF-SENSING FAULT DETECTION 有权

    公开(公告)号：US20250141391A1

    公开(公告)日：2025-05-01

    申请号：US18496175

    申请日：2023-10-27

    Applicant: Caterpillar Inc.

    Inventor： Ahmed Khalil ,  Jackson Wai ,  Sajan Abdul

    IPC: H02P29/032 ,  B60L15/00 ,  H02P23/14

    Abstract: Techniques are described to continuously calculate an inverter DC power of a synchronous machine, e.g., motor or generator, based on the individual phase currents, DC link voltage, and gate signals, which can be compared against the commanded mechanical power based of the estimated rotor speed and commanded torque. A controller can determine whether to shut down the inverter, such as the pulse width modulation (PWM), if the DC power is greater than a threshold value. Such a threshold can be defined to allow an acceptable position and speed estimation error margin.

    Power Based Pulse Injection Control for SR Self Sensing
    29.
    发明申请
    Power Based Pulse Injection Control for SR Self Sensing 有权

    公开(公告)号：US20220231626A1

    公开(公告)日：2022-07-21

    申请号：US17154832

    申请日：2021-01-21

    Applicant: Caterpillar Inc.

    Inventor： Jesse Ray Gerdes ,  James Michael Thorne ,  Ahmed Khalil ,  Jackson Wai ,  Sajan Abdul ,  Amara Ashfaq

    IPC: H02P25/089 ,  E02F9/20

    Abstract: Power based self-sensing of a rotor position of an SR motor at mid to high speeds and low torque is achieved by an SR motor control system by comparing the motor power to an injection maximum power. A position current pulse is injected to a stator pole in response to the motor power being less than the injection maximum power. An actual stator current created by the position current pulse is compared to an estimated stator current, and a stored estimated rotor position in a memory is updated to a new estimated rotor position if the actual stator current is not equal to the estimated stator current.

    System to control a rotary electric machine
    30.
    发明授权
    System to control a rotary electric machine 有权

    公开(公告)号：US10666182B1

    公开(公告)日：2020-05-26

    申请号：US15947540

    申请日：2018-04-06

    Applicant: Caterpillar Inc.

    Inventor： Carlos E. Nino Baron ,  Ahmed Khalil ,  Jackson Wai ,  Jesse R. Gerdes ,  Sangameshwar Sonth ,  Amir Saad

    IPC: H02P25/08 ,  H02P21/18 ,  H02P21/14 ,  H02P6/185

    Abstract: A control system for a rotary electric machine includes a controller configured to generate dynamic input current data based upon a dynamic analysis of self flux data, mutual flux data, and saturation scaling factor data. Upon generating a torque request, the controller is configured to determine a desired electrical input based upon the dynamic input current data to generate the desired output torque. The desired electrical input includes a magnitude and duration of an electrical pulse and a desired angular position of the rotor of the rotary electric machine relative to the stator of the machine. The controller determines an angular position of the rotor and generates an operating command to generate the desired electrical input at the desired angular position of the rotor to propel the rotary electric machine and generate the desired output torque. A rotary electric machine and method of operating same are provided.

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