公开(公告)号：US20230179138A1

公开(公告)日：2023-06-08

申请号：US17923817

申请日：2021-05-05

Applicant: Cummins Inc.

Inventor： Akm Arafat ,  Minyu Cai ,  Dakshina S. Murthy-Bellur

IPC: H02P29/64 ,  H02P23/00 ,  H02P27/08

CPC classification number: H02P29/64 ,  H02P23/0004 ,  H02P27/08

Abstract: A method for operating an electric drive system is provided. For example, a controller retrieves, from memory, a predictive model indicating predictive winding temperatures associated with known negative temperature coefficient (NTC) temperatures, wherein the predictive model is based on historical NTC temperatures and historical winding temperatures, as well as one or more operating parameters. The controller receives current NTC information indicating one or more current NTC readings corresponding to one or more switching devices within the inverter. The controller determines estimated winding temperatures corresponding to the electric machine based on the predictive model and the one or more current NTC readings as well as current operating parameters. The controller provides instructions to adjust inputs to the electric machine based on the estimated winding temperatures.

公开(公告)号：US20230179134A1

公开(公告)日：2023-06-08

申请号：US17915450

申请日：2021-02-08

Applicant: Cummins Inc.

Inventor： Akm Arafat ,  Bradford K.O. Palmer

IPC: H02P25/20

CPC classification number: H02P25/20

Abstract: A method and system of performing a pole switching operation in a multi-phase machine include operating the multi-phase machine in a first configuration with a first number of poles, where the first number of poles is based on a first number of phases in the first configuration and a number of stator slots allocated for each winding in the multi-phase machine. The method and system also include receiving a signal indicating the pole switching operation in the multi-phase machine. In response to receiving the signal, the method and system include operating the multi-phase machine in a second configuration with a second number of poles, where the second number of poles is based on a second number of phases in the second configuration and the number of stator slots allocated for each winding in the multi-phase machine.

公开(公告)号：US20230145167A1

公开(公告)日：2023-05-11

申请号：US17916390

申请日：2020-04-01

Applicant: Cummins Inc.

Inventor： Akm Arafat ,  Bradford K.O. Palmer ,  S. Dakshina Murthy-Bellur ,  Minyu Cai

IPC: H02P6/10 ,  H02P29/50

CPC classification number: H02P6/10 ,  H02P29/50

Abstract: A method for operating a motor control system to dynamically compensate for low-frequency and/or high-frequency torque ripple. Embodiments include receiving an input command, receiving drive feedback signals representative of drive currents in a motor, identifying harmonics in the drive feedback signals representative of motor torque ripple, producing torque ripple compensation signals based on the identified harmonics; and producing motor drive control signals based on the input command, the current feedback signals, the torque ripple compensation signals, and carrier signals with a certain phase shift.