公开(公告)号：US20220200502A1

公开(公告)日：2022-06-23

申请号：US17129201

申请日：2020-12-21

Applicant: Caterpillar Inc.

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

IPC: H02P25/098 ,  H02P21/20 ,  H02P25/08

Abstract: A system and method for torque compensation in a switched reluctance (SR) machine disposed on a machine is disclosed. The system may comprise a SR machine, an inverter and a controller. The controller is in operable communication with the inverter and is configured to determine a commanded main current associated with energization by a main current of a first portion of the plurality of windings for a controlling phase, and determine a commanded parasitic current associated with energization by a parasitic current of a second portion of the windings in a non-controlling phase. The controller is further configured to determine an offset current based on the commanded parasitic current, and determine a target current based on a first sum of the commanded main current and the offset current, and command the inverter to actuate the target current in the first portion of the windings during the controlling phase.

公开(公告)号：US10715052B2

公开(公告)日：2020-07-14

申请号：US16109277

申请日：2018-08-22

Applicant: Caterpillar Inc.

Inventor： Ahmed Khalil ,  Jackson Wai ,  Jesse Gerdes ,  James Thorne ,  Amir Saad

IPC: H02P29/024 ,  H02M7/537 ,  H02P27/06

Abstract: An electrical inverter may include a plurality of phase modules to provide a plurality of phase outputs. Two or more of the plurality of phase modules may share a common insulated-gate bipolar transistor.

公开(公告)号：US20170229992A1

公开(公告)日：2017-08-10

申请号：US15040795

申请日：2016-02-10

Applicant: Caterpillar Inc.

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

IPC: H02P25/089 ,  H02P23/14

CPC classification number: H02P25/089 ,  H02P21/141 ,  H02P21/18 ,  H02P21/24 ,  H02P23/14

Abstract: A control system for a switched reluctance (SR) machine having a rotor and a stator is provided. The control system may include a converter circuit in electrical communication between the stator and a common bus, and a controller configured to monitor a bus voltage of the converter circuit and a phase current of the SR machine. The controller may be configured to determine a phase voltage based on one or more of main pulses and any diagnostic pulses, determine an estimated flux based on the phase voltage and an associated mutual voltage, determine a rotor position based at least partially on the estimated flux, and control the SR machine based on the rotor position and a desired torque.

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。

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。

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。

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.

公开(公告)号：US11811344B2

公开(公告)日：2023-11-07

申请号：US17132076

申请日：2020-12-23

Applicant: Caterpillar Inc.

Inventor： Jesse R. Gerdes ,  Thomas M. Sopko ,  Carlos E. Nino Baron ,  Jackson Wai ,  Ahmed Khalil ,  Sajan Abdul ,  Amara Ashfaq ,  James Michael Thorne

IPC: B60L15/20 ,  H02P23/30 ,  E02F9/20 ,  E02F3/76 ,  E02F3/84 ,  E02F9/02

CPC classification number: H02P23/30 ,  E02F9/207 ,  E02F3/7609 ,  E02F3/841 ,  E02F9/02

Abstract: A work machine includes a frame, a traction system supporting the frame, a power source mounted on the frame, a switched reluctance motor, an inverter configured to control power to the motor from a power source, and a controller. The controller is configured to receive a signal indicating a desired torque and determine if the desired torque is between an upper threshold and a lower threshold. If the desired torque is between the upper threshold and the lower threshold, pulse width modulation is used to produce a PWM adjusted torque command, and the motor is commanded based on the PWM adjusted torque command. The PWM adjusted torque command is configured to cycle between the upper threshold and the lower threshold to produce the desired torque.

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.

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.