-
公开(公告)号：US11190126B2
公开(公告)日：2021-11-30
申请号：US16568777
申请日：2019-09-12
Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION
Inventor： Zhe Zhang , Prerit Pramod
Abstract: Technical solutions are described for controlling operation of a multiphase electric machine using a signal generator configured to generate n number of duty cycle signals of a combination pulse width modulation (PWM) scheme comprising of a continuous PWM scheme and a noncontinuous PWM scheme, with n being an integer greater than 3. A blending coefficient value determines relative weights of each of the continuous and noncontinuous PWM schemes in forming the combination PWM scheme. A blending function determines relative weights of each of the continuous PWM scheme and the noncontinuous PWM scheme used to generate the duty cycle signals. The bending function is calculated piecewise based on a difference between the blending coefficient value and two threshold values. The signal generator uses each of the duty cycle signals to control switching of a DC power to a corresponding phase of the multiphase electric machine.
-
公开(公告)号：US10411634B2
公开(公告)日：2019-09-10
申请号：US15824482
申请日：2017-11-28
Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION
Inventor： Prerit Pramod , Zhe Zhang
Abstract: Technical solutions are described for preventing controller windup in a motor control system. An example system includes a first anti-windup module that receives a commanded voltage and a limited voltage command. The limited voltage command is applied to an electric motor, where the first anti-windup module generates a first modified current command by modifying a current command that is applied to the motor control system. The modification is based on a ratio of the commanded voltage and the limited voltage command. The system further includes a second anti-windup module that receives the commanded voltage and the limited voltage command. The second anti-windup module generates a second modified current command by modifying the first modified current command. The modification based on a difference between the commanded voltage and the limited voltage command.
-
公开(公告)号：US10153714B2
公开(公告)日：2018-12-11
申请号：US15362895
申请日：2016-11-29
Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION
Inventor： Zhe Zhang , Prerit Pramod
Abstract: An embodiment of a control system for controlling operation of an electric motor includes a current command module configured to receive a torque command and output a current command, and a current controller module configured to generate a modulation index value based on the current command. The system also includes a signal generator configured to generate a voltage signal modulated via a pulse width modulation (PWM) scheme based on the modulation index value, the PWM scheme being a combination of a continuous PWM scheme and a non-continuous PWM scheme based on the modulation index value being greater than or equal to a first threshold value, the signal generator configured to output the voltage signal to the electric motor.
-
4.发明申请公开(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
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.
-
公开(公告)号：US10097120B2
公开(公告)日：2018-10-09
申请号：US15280204
申请日：2016-09-29
Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION
Inventor： Prerit Pramod , Zhe Zhang , Nayeem Mahmud
Abstract: An embodiment of a control system includes a pulse modulation module configured to generate a modulation signal controlling application of voltages to an electric motor, the modulation signal having a series of one or more successive pulses corresponding to a control cycle. The system also includes a current prediction module configured to receive a sampled electric current value from the electric motor taken at a sample time during a first control cycle n, predict a value of the electric current at a subsequent time related to an immediately following control cycle n+1 based on the sampled electric current value and a voltage applied to the motor during the first control cycle n, and output the predicted electric current value to the pulse modulation module. The system further includes a converter module configured to receive the modulation signal and output a voltage signal to the motor based on the modulation signal.
-
Patent Agency Ranking
公开(公告)号：US20180152123A1
公开(公告)日：2018-05-31
申请号：US15362895
申请日：2016-11-29
Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION
Inventor： Zhe Zhang , Prerit Pramod
CPC classification number: H02P6/08 , B62D5/0463 , H02M1/12 , H02M7/53873 , H02M2001/0054 , H02M2007/53876 , H02P27/085
Abstract: An embodiment of a control system for controlling operation of an electric motor includes a current command module configured to receive a torque command and output a current command, and a current controller module configured to generate a modulation index value based on the current command. The system also includes a signal generator configured to generate a voltage signal modulated via a pulse width modulation (PWM) scheme based on the modulation index value, the PWM scheme being a combination of a continuous PWM scheme and a non-continuous PWM scheme based on the modulation index value being greater than or equal to a first threshold value, the signal generator configured to output the voltage signal to the electric motor.
-
7.发明授权公开(公告)号：US11591009B2
公开(公告)日：2023-02-28
申请号：US16693516
申请日：2019-11-25
Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION
Inventor： Haibo Li , Prerit Pramod , Krishna M P K Namburi , Zhe Zhang
Abstract: Technical solutions are described for controlling operation of an electric machine such as a permanent magnet synchronous motor (PMSM) drive or motor control system to protect against excessive machine current or voltage in a PMSM drive. Systems and methods employ a torque control algorithm for PMSMs that uses the constraints of both machine current and voltage capability in PMSM drives, and online torque command modification according to the maximum allowed torque under these machine current and voltage constraints.
-
公开(公告)号：US11349430B2
公开(公告)日：2022-05-31
申请号：US16653429
申请日：2019-10-15
Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION
Inventor： Prerit Pramod , Krishna Namburi , Zhe Zhang
Abstract: Technical solutions are described for controlling operation of an inverter to manage voltage upon a direct current (DC) bus and regenerative power (current) provided to a battery. A control system and method are provided to control operation of an electric machine using a controller. More specifically, the controller is configured to calculate a current-based torque limit to satisfy a regenerative current limit, and a voltage-based torque limit to satisfy a voltage limit constraint of the DC bus. The controller is configured to calculate a torque limit to satisfy the regenerative current and voltage limits of the DC bus, and to command a plurality of switches within the inverter to generate a direct-axis current from the electric machine corresponding to a torque demand and according to the torque limit. The proposed system and method provide for motor current that exceed a demagnetizing current limit of the electric machine.
-
公开(公告)号：US11218099B2
公开(公告)日：2022-01-04
申请号：US16695910
申请日：2019-11-26
Applicant: STEERING SOLUTIONS IP HOLDING CORPORATION
Inventor： Prerit Pramod , Zhe Zhang , Krishna MPK Namburi
Abstract: A system and method for improved anti-windup that minimizes supply current draw under voltage saturated current control operation of synchronous motor drives are provided. The system and method use a voltage limiting module configured to receive a pre-limit voltage command and generate a post-limit voltage command when the motor control system reaches configured threshold; and an anti-windup module configured to determine a voltage difference between the post-limit and pre-limit voltage commands, and compute an anti-windup feedback current using the voltage difference and compensation gains selected to minimize supply current. The compensation gains comprise a gain matrix of values selected to move a motor current trajectory toward a null motor current vector, and the anti-windup module multiplies the gain matrix values by the voltage difference. The anti-windup feedback current and an input current command are then added and provided as an input to the controller.
-
公开(公告)号：US11101764B2
公开(公告)日：2021-08-24
申请号：US16684334
申请日：2019-11-14
Applicant: Steering Solutions IP Holding Corporation
Inventor： Zhe Zhang , Prerit Pramod , Krishna Namburi
Abstract: An electric motor drive system is provided. It includes a rotor having permanent magnets arranged therein and a stator surrounding the rotor an inverter having switches arranged therein, the switches operable to draw current from a direct current bus and operate the electric machine through windings of the stator and a controller operable to receive a source current limit, IS, and a source voltage limit, VDC, both associated with the direct current bus is also provided. The invertor is responding to a torque demand to operate the switches of the inverter to generate an alternating current corresponding to the torque demand and according to a torque limit defined by a source current torque limit corresponding to the source current limit when the source current torque limit is less than or equal to a source voltage torque limit corresponding to the source voltage limit.
-
-
-
-
-
-
-
-
-
Search Results
25
records
(took 0.097 seconds)
