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：US11545922B2

公开(公告)日：2023-01-03

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: H02K21/00 ,  H02P25/089 ,  E02F9/20 ,  E02F3/76 ,  E02F3/84

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.