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Author

P. Srinivas

Bio: P. Srinivas is an academic researcher from University College of Engineering. The author has contributed to research in topics: Switched reluctance motor & Reluctance motor. The author has an hindex of 3, co-authored 4 publications receiving 25 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the authors presented a high dynamic control technique called Direct Instantaneous Torque Control (DITC) where in the torque is maintained within a hysteresis band by changing the switching states of the phases.
Abstract: The switched reluctance motor drives has evolved as an alternative to conventional motors in variable speed drives because of advantages like simple and rugged structure, absence of rotor winding, adaptability to harsh environments like coal mining, high speed operation etc. Because of nonlinearity, torque ripple is high in the motor. This paper presents a high dynamic control technique called Direct Instantaneous Torque Control (DITC) where in the torque is maintained within a hysteresis band by changing the switching states of the phases. Thus torque ripple minimization and fast torque response is an inherent property of DITC. This paper analyses performance of the drive mainly in terms of the torque ripple during acceleration and steady state conditions with DITC in MATLAB/SIMULINK environment and results are discussed elaborately.

13 citations

Proceedings ArticleDOI
26 Dec 2007
TL;DR: In this paper, the effect of turn-on and turn-off angles of the converter on the dynamic performance of the switched reluctance motor (SRM) was analyzed for voltage control as well as hysteresis current control at no load.
Abstract: The switched reluctance motor (SRM) can develop either positive or negative torque based on the turn-on or turn- off angles of the converter. Positive torque is developed if the turn-on and turn-off angles are confined to the positive or zero increasing inductance region of stator winding. The torque & speed ripples greatly depend on these angles. The effect of turn- off angle of the converter on the dynamic performance of the SRM is studied. It is analyzed for voltage control as well as hysteresis current control at no-load. An optimal value of turn- off angle which gives minimum torque & speed ripples can be obtained.

7 citations

01 Jan 2012
TL;DR: In this article, the speed control of a 4 phase 8/6 Switched Reluctance Motor drive using Digital Signal Processor is presented, which is tested and implemented in the laboratory from no-load to full-load for both open loop and closed-loop operations.
Abstract: This paper presents the speed control of 4 phase 8/6 Switched Reluctance Motor drive using Digital Signal Processor. The motor is fed from a DC split converter. The Hall sensors provided in the motor provide signals corresponding to the position of the rotor and the speed is controlled by varying the duty ratio of the PWM controller. The system has been tested and implemented in the laboratory from no-load to full-load for both open- loop and closed- loop operations. The actual current and voltage waveforms are captured by Power Analyzer.

4 citations

Journal Article
TL;DR: In this article, the performance of SRM can be improved by minimizing its torque ripple using a novel control technique called Direct Torque Control (DTC), where torque is controlled directly through control of magnitude of the flux and change in speed of the stator flux vector.
Abstract: Since torque ripple is the main cause of noise and vibrations, the performance of Switched Reluctance Motor (SRM) can be improved by minimizing its torque ripple using a novel control technique called Direct Torque Control (DTC). In DTC technique, torque is controlled directly through control of magnitude of the flux and change in speed of the stator flux vector. The flux and torque are maintained within set hysteresis bands. The DTC of SRM is analyzed by two methods. In one method, the actual torque is computed by conducting Finite Element Analysis (FEA) on the design specifications of the motor. In the other method, the torque is computed by Simplified Torque Equation. The variation of peak current, average current, torque ripple and speed settling time with Simplified Torque Equation model is compared with FEA based model. Keywords—Direct Toque Control, Simplified Torque Equation, Finite Element Analysis, Torque Ripple.

3 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, a B-spline neural network is used to model the nonlinearity of the SRM and estimate back electromotive force and incremental inductance on-line in real time.
Abstract: To reduce torque ripple in a switched reluctance motor (SRM) by current profiling, a high-performance current controller is necessary. This study presents a high-performance current controller for SRM drives. A B-spline neural network is used to model the non-linearity of the SRM and estimate back electromotive force (EMF) and incremental inductance on-line in real time. The on-line modelling scheme does not require a priori knowledge of the machine's electromagnetic characteristics. Based on the on-line estimated parameters, a current controller with adjustable PI gains and back-EMF decoupling is implemented. The performance of the current controller has been demonstrated in simulation and experimentally using a four-phase 8/6 550'W SRM drive system.

56 citations

Journal ArticleDOI
TL;DR: Speed control of switched reluctance motor (SRM) with torque ripple reduction using direct Instantaneous torque control (DITC) and different turn-off angles are compared to improve the performance of torque ripple.

29 citations

Proceedings ArticleDOI
12 Apr 2013
TL;DR: In this article, a Direct Instantaneous Torque Control (DITC) technique for minimizing the torque ripple in Switched Reluctance Motor (SRM) drive is presented.
Abstract: This paper presents Direct Instantaneous Torque Control (DITC) technique for minimization of torque ripple in Switched Reluctance Motor drive. SRM is a unique choice as a drive system for EV application due to its robustness, high starting torque and wide speed range operation. But high torque ripple is a major drawback in SRM which is due to its double salient structure. In DITC torque is taken as a direct control variable on an instantaneous basis. In this paper hysteresis controller is used for controlling the torque in which torque is used as a reference variable. Look up table is used for estimation of phase torque with phase current and flux linkage as input parameter. In DITC torque is maintain within the hysteresis band by changing the switching states of phases. The dynamic performances of machine are discussed in terms of torque ripple with DITC in MATLAB/SIMULINK software.

18 citations

01 Jan 2013
TL;DR: Results show that the use of PIC Microcontroller and GUI in Matlab is an advantage solution to control the rotational angle.
Abstract: Automatic control of DC servo motor in terms of rotation angle has played a vital role in the advance Electromechanical Engineering. Nowadays, the automatic process of motor control using a Personal Computer (PC) is commonly used. The controllers are designed to interface between a Computer and Motor. This paper presents the implementation of PIC Microcontroller with Graphical User Interface (GUI) in Matlab to track the rotational angle of DC servo motor. The movement of slider on GUI will act as an input signal into the Microcontroller to change the rotation angle. A simulation on the performance of the system has been carried out using Proteus software interfaced with Matlab and the controller was tested on real-time application. Results show that the use of PIC Microcontroller and GUI in Matlab is an advantage solution to control the rotational angle.

18 citations

Proceedings ArticleDOI
01 Oct 2016
TL;DR: An enhanced speed and current control with PWM mode to minimize torque ripple in Switched Reluctance Motor and the proposed technique is implemented in the Matlab/Simulink platform.
Abstract: This paper mainly proposes a speed and current control strategy to minimize torque ripple in Switched Reluctance Motor (SRM). The dynamic behavior of the SRM is analyzed in terms of the parameters such as the speed, current, inductance and torque. Based on the parameters, the motor speed is controlled and minimized the torque ripples. After that, the control signal is generated for controlling the speed of the SRM. Hence, this paper proposed an enhanced speed and current control with PWM mode to minimize the torque ripples. A recent optimization approach based current and torque control technique is proposed for regulating the speed of the SRM. Here, Ant-Lion Optimizer (ALO) algorithm based Fractional Order PID (FOPID) controller is utilized to analyze the speed and torque of SRM. To get the optimal results of FOPID controller, the gain parameters are optimized. The ALO algorithm is utilized to achieve the optimal gain parameter of the FOPID controller. Finally, the proposed technique is implemented in the Matlab/Simulink platform. The performance analysis of the proposed method is demonstrated and contrasted with the existing techniques such as Genetic Algorithm (GA) and Particle Swarm Optimization (PSO) algorithm techniques.

12 citations