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arXiv 2023年

作者： Pramod, Prerit Control Systems Engineering MicroVision Inc. United States

Modern power steering systems employ an electric motor drive system to provide torque assistance to the driver. The closed-loop mechanical system dynamics that impact stability, performance and steering feel are significantly impacted by the electrical dynamics of the actuator depending on the structure and tuning of the motor torque controller. This paper presents an integrated approach to the analysis of this electromechanical dynamic control interaction through mathematical modeling which is confirmed with simulations. © 2023, CC BY-NC-SA.

关键词： Electric drives

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Position Sensing Errors in Synchronous Motor Drives

arXiv

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arXiv 2023年

作者： Pramod, Prerit Control Systems Engineering MicroVision Inc. United States

Non-ideal position estimation results in degraded performance of synchronous motor drive systems due to reduction of the average capability of the drive as well as torque harmonics of different orders. The signature and extent of the performance degradation is further dependent, quite significantly, on the current control architecture, i.e., feedforward or feedback control, employed. This paper presents a comprehensive analysis of non-idealities or errors in position estimation and their effects on the control performance of synchronous motor drives. Analytical models capturing the error in various signals caused by position sensing errors in the drive system for different control architectures are presented and are validated with simulation and experimental results on a prototype permanent magnet synchronous motor drive. © 2023, CC BY-NC-SA.

关键词： Errors

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Circulating Current Induced Electromagnetic Torque Generation in Electric Machines with Delta Windings

arXiv

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arXiv 2023年

作者： Pramod, Prerit Control Systems Engineering MicroVision Inc. United States

This paper explains the phenomenon of current circulation and the resulting electromagnetic torque generation in electric machines employing delta windings. The description entails a systematic assessment of the electrical and magnetic behavior of the machine to develop mathematical models, followed by intuitive explanations of the derived analytical forms. The modeling is thoroughly validated through simulation and experimental results on a prototype machine. © 2023, CC BY-NC-SA.

关键词： Winding

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Design, Analysis, and Implementation of Robust Two Degree of Freedom Current Regulator for Switched Reluctance Machines

Design, Analysis, and Implementation of Robust Two Degree of...

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IEEE Energy Conversion Congress and Exposition, ECCE

作者： Nikunj Gupta Siddharth Mehta Prerit Pramod Iqbal Husain Department of ECE NC State University Raleigh NC USA Software and Controls Engineering Lightship Energy Inc. San Francisco CA USA Control Systems Engineering MicroVision Inc. Redmond WA USA

ISBN: (数字)9798350376067

ISBN: (纸本)9798350376074

The paper presents a feedback current control architecture for switched reluctance motors (SRMs) that employs a two degree-of-freedom (2DoF) approach. The control design incorporates direct state feedback to improve disturbance rejection capabilities and enhance robustness enabled by closed-loop frequency response shaping. The controller gain tuning method is presented through a detailed stability analysis of the closed-loop system. The effectiveness of the proposed control architecture is validated through non-linear simulations and experimental testing conducted on a 12-slot 8-pole, 12V, 250W SRM.

关键词： Current control State feedback Analytical models Sensitivity Switches Switched reluctance motors Stability analysis Robustness Frequency response Tuning

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Hybrid Current control of Rare Earth Free Biaxial Excitation Synchronous Machines

Hybrid Current Control of Rare Earth Free Biaxial Excitation...

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IEEE Transportation Electrification Conference and Expo (ITEC)

作者： Krishna M P K Namburi Prerit Pramod Ritvik Chattopadhyay Ion Boldea Iqbal Husain Research and Development Nexteer Automotive Corporation Auburn Hills USA Control Systems Engineering MicroVision Redmond USA Electrical and Computer Engineering North Carolina State University Raleigh USA Electrical Engineering Politehnica University Timisoara Timisoara Romania

ISBN: (数字)9798350317664

ISBN: (纸本)9798350317671

Rare-earth free biaxial excited synchronous machines (BESM) are best suited for achieving unity power factor at their base speed which enables the characteristic of high-power density and lower cost for a traction motor drive system. Feedforward and feedback current control techniques are widely employed control techniques for any electric machine due to their features of low cost and dynamic performance respectively. Due to the nature of dual excitation of the machine, a hybrid current control technique is explored in this paper. Feedforward current control is being employed for stator currents in synchronous reference frame and feedback current control is employed for rotor field current. Typically, feedforward current control requires accurate knowledge of motor parameters. However, the parameters vary nonlinearly based on the operation of BESM. Hence, it is important to analyze and understand the impact of machine parameter estimation errors on the steady state as well as the dynamic performance of the system. This paper presents a detailed implementation of the hybrid current control technique along with the parameter sensitivity analysis. Analytical expression for the actual currents in the hybrid current controlled BESM is developed under parameter estimation errors and the analysis is verified extensively under various circumstances.

关键词： Current control Parameter estimation Costs Rotors Transportation Stators Traction motors

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Double-Integral Ramp Tracking Current Regulator Architecture for Switched Reluctance Machines

Double-Integral Ramp Tracking Current Regulator Architecture...

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IEEE Energy Conversion Congress and Exposition, ECCE

ISBN: (数字)9798350376067

ISBN: (纸本)9798350376074

This paper presents a novel dynamic current regulator design for switched reluctance motor (SRM) drives, capable of tracking ramp and step commands with zero steady-state error. The proposed controller features a double integral structure, that is particularly suitable for tracking quasi-trapezoidal current references typically used for reluctance machines. Enhanced closed-loop command tracking especially with ramp commands along with improved disturbance rejection is achieved through this control scheme. A comprehensive linear analysis is provided, offering guidelines for shaping the closed-loop command tracking frequency response. The theoretical framework is corroborated by non-linear simulation results obtained from a 12-slot, 8-pole, 250W SRM, with machine parameters extracted from a finite element model. A comparative study against a proportional-integral (PI) controller demonstrates the superior performance of the proposed controller.

关键词： State feedback Regulators PI control Parameter estimation Simulation Switches Switched reluctance motors Robustness Steady-state Tuning

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Dynamic Current control of Rare Earth Free Biaxial Excitation Synchronous Machines

Dynamic Current Control of Rare Earth Free Biaxial Excitatio...

引用

IEEE Energy Conversion Congress and Exposition, ECCE

作者： Krishna MPK Namburi Prerit Pramod Ion Boldea Iqbal Husain Research and Development Nexteer Automotive Corporation Auburn Hills USA Control Systems Engineering MicroVision Inc. Redmond USA Electrical Engineering Politehnica University Timisoara Timisoara Romania Electrical and Computer Engineering North Carolina State University Raleigh USA

ISBN: (数字)9798350376067

ISBN: (纸本)9798350376074

Rare-earth free biaxial excited synchronous machines (BESM) are ideally suited for achieving unity power factor at their base speed which enables the characteristic of high-power density and lower cost for a traction motor drive system. Due to the presence of dual excitation sources, the current control design for two coupled subsystems, one consisting of the stator winding currents in synchronous reference frame and the other consisting of rotor field current is proposed. A novel two degree of freedom dynamic current control architecture is proposed, featuring closed-loop frequency response shaping and state feedback decoupling. The performance characteristics of the current control system, including command tracking, disturbance rejection, and robustness, are evaluated through detailed analytical modeling and validated via extensive simulations on a practical BESM.

关键词： Current control Analytical models State feedback Stator windings Rotors 2-DOF Traction motors Robustness Frequency response Synchronous machines

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Modeling, Characterization, and Identification of Permanent Magnet DC Motors

Modeling, Characterization, and Identification of Permanent ...

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IEEE International Conference on Electric Machines and Drives (IEMDC)

作者： Vidit Pandya Siddharth Mehta Prerit Pramod Mechanical & Aerospace Engineering North Carolina State University Raleigh NC USA Global Advanced Engineering Nexteer Automotive Corporation Saginaw MI USA Control Systems Engineering MicroVision Inc Redmond WA USA

This work presents a systematic approach to model and characterize the electrical and mechanical parameters of permanent magnet DC (PMDC) machines. For high-performance applications requiring enhanced control performance, the interdependence among the parameters plays a key role. This work illustrates the interdependence and the challenges arising due to this coupling and provides parameter estimation methods to overcome them. Additionally, the non-linearly varying brush drop is also modeled and characterized in this paper. Experimental results are conducted on a 250 W PMDC motor to further validate the proposed methods.

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