公开(公告)号：US20230396054A1

公开(公告)日：2023-12-07

申请号：US17830179

申请日：2022-06-01

Applicant: Caterpillar Inc.

Inventor： Jesse R. Gerdes ,  Jackson Wai ,  Seok-hee Han

IPC: H02H3/08 ,  H02M1/00 ,  H02M1/32 ,  H02M7/5387 ,  H02P29/024

CPC classification number: H02H3/083 ,  H02M1/0009 ,  H02M1/32 ,  H02M7/53871 ,  H02P29/027

Abstract: An apparatus can include an inverter to provide an output N-phase alternating-current to an external component. When N equals two, a phase of the N phases can include an upper gate and a lower gate. The apparatus can also include a current detector configured to detect a phase current magnitude of the output alternating current. The apparatus can also include a controller coupled to the current detector and to the inverter. The controller can generate a gate command for controlling a gate of the inverter. The controller can also determine a value for a current threshold less than a shutoff current threshold for the external component. The controller can provide a protection command to turn off the upper gate of a corresponding phase of the inverter responsive to detecting that the phase current magnitude is greater than the current threshold.

公开(公告)号：US09899946B2

公开(公告)日：2018-02-20

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: H02P25/08 ,  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.