公开(公告)号：US20240128821A1

公开(公告)日：2024-04-18

申请号：US18544084

申请日：2023-12-18

Applicant: Steering Solutions IP Holding Corporation

Inventor： Prerit Pramod

IPC: H02K3/28 ,  H02P21/00 ,  H02P25/22

CPC classification number: H02K3/28 ,  H02P21/0003 ,  H02P25/22 ,  H02K2201/15

Abstract: A method of controlling a dual wound synchronous machine (DWSM) includes: determining virtual current commands based on a current command associated with each of two winding sets of the DWSM; determining virtual half-motor currents by applying a mathematical transformation on measured output currents; determining half-motor difference currents based on differences between the corresponding virtual current command and the virtual half-motor current; calculating forward path voltage commands based on the corresponding difference currents and using first and second gain factors; determining feedback voltage commands by applying third and fourth gain factors to the virtual half-motor currents; determining virtual final voltage commands based on the corresponding forward path and feedback voltage commands; determining final voltage commands by applying a second mathematical transformation to the virtual final voltage commands; commanding, based on the final voltage commands, inverters to apply corresponding voltages to the two winding sets and thereby generating the output currents.

公开(公告)号：US11938918B2

公开(公告)日：2024-03-26

申请号：US17496241

申请日：2021-10-07

Applicant: Steering Solutions IP Holding Corporation

Inventor： Nakul Shah ,  Prerit Pramod ,  Krishna MPK Namburi

IPC: B60W10/08 ,  B60L15/20

CPC classification number: B60W10/08 ,  B60L15/20 ,  B60L2240/423 ,  B60W2710/083

Abstract: A method of controlling operation of an electric machine includes: determining a voltage-based torque limit based on a voltage constraint of a direct current (DC) bus supplying power to an inverter for powering the electric machine; determining a motor current-based torque limit based on a motor current limit; determining a supply current-based torque limit based on a supply rating, to supply current to the inverter, of the DC bus; determining a regenerative current-based torque limit based on a receive rating, to receive current from the inverter, of the DC bus; determining a final torque limit based on the voltage-based torque limit, the motor current-based torque limit, the supply current-based torque limit, and the regenerative current-based torque limit; determining a limited command torque based on a torque command and the final torque limit; and calculating at least one current command based on, at least, the limited command torque.

公开(公告)号：US11936316B2

公开(公告)日：2024-03-19

申请号：US17863335

申请日：2022-07-12

Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION

Inventor： Pawel Szymula ,  Prerit Pramod

IPC: H02P23/14 ,  H02P25/022 ,  H02P27/08

CPC classification number: H02P23/14 ,  H02P25/022 ,  H02P27/08

Abstract: A method of controlling a permanent magnet synchronous machine (PMSM) includes: determining an estimated back-electromotive force (BEMF) generated in windings of the PMSM based on an estimated voltage applied to the windings of the PMSM, an estimated motor current of the PMSM, an estimated motor circuit resistance, and an estimated synchronous inductance of the PMSM. The method also includes determining an estimated permanent magnet (PM) flux linkage in the PMSM based on the estimated motor current of the PMSM; determining a BEMF correction term based on the estimated PM flux linkage; and determining an estimated rotor flux space vector based on the estimated BEMF and the BEMF correction term.

公开(公告)号：US11804799B2

公开(公告)日：2023-10-31

申请号：US16836822

申请日：2020-03-31

Applicant: Steering Solutions IP Holding Corporation

Inventor： Prerit Pramod ,  Rakesh Mitra ,  Darren Qu ,  Subhra Paul ,  Julie A. Kleinau

IPC: H02P29/024 ,  B62D5/04 ,  H02P6/185

CPC classification number: H02P29/0243 ,  B62D5/046 ,  H02P6/185

Abstract: A system for controlling a synchronous motor drive may be configured to receive a command voltage signal and to identify, in the synchronous motor drive, a resistance imbalance signature from the command voltage signal. The system may determine, based on the resistance imbalance signature, respective phase resistances that correspond to phases of a synchronous motor of the synchronous motor drive. Each respective phase resistance may include a phase transistor resistance and a phase winding resistance. The system may identify, based on the phase resistances and an estimated average resistance between the phases of the synchronous motor, one or more phases of the synchronous motor that correspond to one or more phase resistances representing a resistance imbalance.

公开(公告)号：US20220105978A1

公开(公告)日：2022-04-07

申请号：US17496206

申请日：2021-10-07

Applicant: Steering Solutions IP Holding Corporation

Inventor： Prerit Pramod ,  Krishna MPK Namburi ,  Nakul Shah

IPC: B62D5/04

Abstract: A method of controlling operation of an electric machine includes: calculating a voltage-based torque limit based on a voltage constraint of a direct current (DC) bus supplying power to an inverter for powering the electric machine; calculating a current-based torque limit based on a motor current limit; determining a final torque limit based on the voltage-based torque limit and the current-based torque limit; determining a limited command torque based on a torque command and the final torque limit; and generating at least one current command based on, at least, the limited command torque. A control system for controlling operation of an electric machine is also provided.

公开(公告)号：US11290042B2

公开(公告)日：2022-03-29

申请号：US15603885

申请日：2017-05-24

Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION

Inventor： Prerit Pramod ,  Krishna Mohan Pavan Namburi ,  Julie Ann Kleinau

IPC: H02P7/06 ,  B62D5/04

Abstract: An embodiment of a control system includes a current command module configured to receive a torque command and output a current command for controlling a direct current (DC) motor, and a supply current limiting module configured to receive a supply current limit as an input and actively compute a motor current limit based on the supply current limit, the supply current limiting module configured to limit the current command based on the motor current limit.

公开(公告)号：US11180186B2

公开(公告)日：2021-11-23

申请号：US16376116

申请日：2019-04-05

Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION

Inventor： Prerit Pramod ,  Kai Zheng ,  Mariam Swetha George ,  Tejas M. Varunjikar

IPC: B62D5/04

Abstract: Technical solutions are described for disturbance feedforward compensation technique for improving the disturbance rejection properties of a closed loop position control system. According to one or more embodiments, a steering system includes a position controller that generates a torque command based on an input rack-position command and a measured position command. Further, a disturbance estimator that estimates a rack force acting on a rack, and an adder generates an adjusted torque command by adding the rack force that is estimated into the torque command. The steering system further includes an actuator that positions the rack according to the adjusted torque command.

公开(公告)号：US11171595B2

公开(公告)日：2021-11-09

申请号：US16698039

申请日：2019-11-27

Applicant: Steering Solutions IP Holding Corporation

Inventor： Prerit Pramod

IPC: H02P29/024

Abstract: A method for detecting an imbalance in a synchronous motor drive, the method including reading an output voltage signal, and extracting a signature of a parameter imbalance from the output voltage signal. The parameter imbalance is in the synchronous motor drive. Responsive to extracting the signature of the parameter imbalance, the method further includes identifying a certain parameter having the parameter imbalance based on an operating condition of a synchronous motor controlled by the synchronous motor drive, and determining at least one phase of the synchronous motor in which the certain parameter is manifesting the parameter imbalance.

公开(公告)号：US10822024B2

公开(公告)日：2020-11-03

申请号：US15804281

申请日：2017-11-06

Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION

Inventor： Prerit Pramod ,  Rakesh Mitra ,  Rangarajan Ramanujam

IPC: B62D5/04 ,  H02P7/285 ,  H02P29/032

Abstract: Technical solutions are described for current sensor fault mitigation for systems with permanent magnet DC drives. An example power steering system includes a brush motor, and a motor control system that generates an amount of torque using the brush motor, the amount of torque corresponding to a torque command. The motor control system includes a current sensor fault detector that detects a current sensor fault associated with a current sensor used to measure a current across the brush motor. The motor control system further includes a velocity observer that computes an estimated motor velocity in response to the current sensor fault. The motor control system further includes a feedforward controller that generates a current command for generating the amount of torque using the brush motor, the current command generated using the estimated motor velocity.

公开(公告)号：US20200130732A1

公开(公告)日：2020-04-30

申请号：US16177265

申请日：2018-10-31

Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION

Inventor： Prerit Pramod ,  Varsha Govindu ,  Zhe Zhang ,  Krishna Mohan Pavan Kumar Namburi

IPC: B62D5/04 ,  G01R19/00 ,  B60L15/02 ,  H02P23/14

Abstract: According to one or more embodiments, an example system includes a motor, and a motor control system that includes a low side current measurement subsystem. The system further includes a processor that switches the motor control system to use feedforward current control in response to detecting a current measurement failure in the low side current measurement subsystem. The processor further identifies a first phase that has a failed current measurement. The processor also computes a current measurement for the first phase, which has the current measurement failure. The processor further uses the computed current measurement to compute a parameter estimate.