公开(公告)号：WO2018111839A1

公开(公告)日：2018-06-21

申请号：PCT/US2017/065756

申请日：2017-12-12

Applicant: CATERPILLAR INC.

Inventor： KHALIL, Ahmed ,  HAN, Seok-hee ,  WAI, Jackson ,  SONTH, Sangameshwar ,  GERDES, Jesse ,  THORNE, James, M.

IPC: H02P27/08 ,  H02P6/18

Abstract: A control system (126) is provided for an electric machine (106) having a rotor (110) and a stator (112). The control system (126) has a converter circuit (116) in electrical communication with the stator (112) and a controller (128) in electrical communication with the converter circuit (116). The controller (128) is configured to receive a first signal indicating a torque applied to or output by the rotor (110) and receive a second signal indicating a rotational speed of the rotor (110). The controller (128) 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 (128) is also configured to inject the pulse signal into one or more phases of the stator (112) via the converter circuit (116) according to the determined at least one characteristic. The controller (128) is also configured to determine a position of the rotor based on the injected pulse signal.

公开(公告)号：WO2019013999A1

公开(公告)日：2019-01-17

申请号：PCT/US2018/040258

申请日：2018-06-29

Applicant: CATERPILLAR INC.

Inventor： KHALIL, Ahmed ,  HAN, Seok-Hee ,  WAI, Jackson ,  THORNE, James M. ,  GERDES, Jesse ,  SONTH, Sangameshwar

IPC: H02P6/17 ,  H02P25/08

Abstract: A system and method (800) for estimating a position and a speed of a rotor (120) of a Switched Reluctance (SR) machine (118) is provided. The SR machine (118) comprises the rotor (120), a stator (122) and at least one winding. The method (800) includes generating a diagnostic pulse having a trapezoidal shape. The method (800) further includes injecting a diagnostic pulse into the at least one winding of the SR machine (118). The method (800) further includes measuring an actual stator current flowing through the at least one winding of the SR machine (118). The method (800) 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 (120) is estimated based on the error signal.