公开(公告)号：US10097117B2

公开(公告)日：2018-10-09

申请号：US15380790

申请日：2016-12-15

Applicant: Caterpillar Inc.

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

IPC: H02P6/00 ,  H02P6/185 ,  H02P25/089

Abstract: A control system is provided for an electric machine having a rotor and a stator. The control system has a converter circuit in electrical communication with the stator and a controller in electrical communication with the converter circuit. The controller is configured to receive a first signal indicating a torque applied to or output by the rotor and receive a second signal indicating a rotational speed of the rotor. The controller is also configured to determine at least one characteristic of a pulse signal based on at least one of the first or second signal. The controller is also configured to inject the pulse signal into one or more phases of the stator via the converter circuit according to the determined at least one characteristic. The controller is also configured to determine a position of the rotor based on the injected pulse signal.

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.