Average torque control of a switched reluctance motor drive. Nonlinear modeling of a switched reluctance motor using lssvm abc 146 where is the number of phases in the machine. Switched reluctance motor concept, control and applications. Switched reluctance sr variable motor microchip technology. Speed control with torque ripple reduction of switched. In contrast to rotating field machines, torque control of switched reluctance machines is not based on model reference control theory, such as fieldoriented control, but is achieved by setting control. In order to solve these problems, a direct torque control dtc technique is used in order to control the torque of the srm. Speed control of switched reluctance motor using artificial. How do switched reluctance motors differ from stepper motors.
Average torque control of a switched reluctance motor. Request pdf torque control of switched reluctance motors this paper presents the performance of an instantaneous torque control method. At the second mode the applied voltage on the motor phase is the negative value of the dc supply voltage, thus the motor phase current will be decays to zero value. Speed control with torque ripple reduction of switched reluctance motor by many optimizing liaison technique.
The drive waveform is composed of one or more harmonics to be used to match the reluctance pattern of the statorrotor, causing the rotor to rotate due to the reluctance effect, and one or more other harmonics to induce current in the rotor, causing the rotor. Motor runs at slip speed reluctance torque, trel reluctance torque, trel maximum reluctance torque, trelmax occurs at. Switched reluctance motor srm drives can be used in all types of adjustable speed applications, including high performance servo drives. This greatly simplifies mechanical design as power does not have to be delivered to a moving part, but it complicates the. Switched reluctance motors are electrically commutated ac. National institute of technology rourkela certificate this is to certify that the thesis entitled direct torque control of switched reluctance motor drives submitted by amalendu dash. Kioskeridis, maximum efficiency in single pulse controlled switched reluctance motor drives, ieee 9 c. Average torque control of a switched reluctance motor drive for light electric vehicle applications author links open overlay panel muhammad usman jamil waree kongprawechnon nattapon chayopitak. The switched reluctance motor srm has both salient pole stator and rotor, like variable stepper motor, but they are designed for different applications, and therefore, with different performance requirements. The paper redesigns the conventional 68 switched reluctance motor srm by a particular way to minimize the losses. A stepper motor is designed to make it suitable for open loop position and speed control in lower applications, where.
Torque control of switched reluctance motors request pdf. The recent surge of activity since the 1980s has spurred university and industrial research and product development in the u. If smooth rotation is the goal, there is an electronicdriven version of the switched reluctance motor. Many intelligent control techniques have been developed but in industries pi controller is the most favored controller. The switched reluctance motor srm is an electric motor which operates on reluctance torque. The tradeoff for this lowcost construction is a more complex drive with more switches and complex control techniques to achieve a smooth torque operation. Reconstruction of the switched reluctance motor stator. This is a 4phase machine with 4 stator pole pairs and 3 rotorpole pairs 86 motor.
Switched reluctance motors srms have an intrinsic simplicity and low cost that makes them well suited to many applications. A stepper motor is designed to make it suitable for open loop position and speed control in low power applications, where efficiency is not an important factor. It combines many of the desirable qualities of inductionmotor drives, dc commutator motor drive, as well as. Model the dynamics of switched reluctance motor simulink. The srm primary drawback is torque ripples in the developed torque leading. Block diagram for the proposed speed control of switched reluctance motor is shown in fig.
For this study, an actual micro, axialflux, singlephase switched reluctance motor with a diameter of 5. Abdelaliem shoubra faculty of engineering, cairo, egypt. Development of a new technique for performance enhancement of. Speed control of switched reluctance motor with torque ripple reduction using nondominated sorting genetic algorithm nsgaii.
The current controller design and analysis is performed through simulations on a practical 12 v, fractional kw 12slot, 8pole srm. It may also be noted that the switched reluctance motor is quite different from the synchronous reluctance motor. Switched reluctance motor srm has become popular in various applications because of its high torque to inertia ratio, high efficiency, variable speed operation capabilities. Electric drives brushless dc and reluctance motors.
Direct torque control of switched reluctance motor drive 43 5. Download switched reluctance motor drives modeling simulation analysis design and applications easily in pdf format for free. Us7852037b2 induction and switched reluctance motor. Sep 01, 2017 switched reluctance motors have fewer poles and a larger stepping angle than stepper motors. However, the motor has doubly salient structure and highly nonuniform torque and magnetization characteristic.
The torque speed characteristic of synchronous reluctance motor is shown in fig. Anyalebechi electrical engineering department, nnamdi azikiwe university awka, anambra state, nigeria. Average torque control of a switched reluctance motor drive for light electric vehicle applications. Nonlinear modeling of a switched reluctance motor using lssvm abc 144 flux linkage characteristics and torque characteristics are highly nonlinear and dependent on the rotor position and phase current 1. Different control strategies are converter control, direct instantaneous torque control, advanced direct. Switched reluctance motors have fewer poles and a larger stepping angle than stepper motors.
Pdf controlling of switched reluctance motor drives. They are more than a highspeed stepper motor, lacking the usual expensive permanent magnets. The rotor is created from lamination in order to minimize the eddy current losses. The switched reluctance motor srm is a type of stepper motor, an electric motor that runs by reluctance torque. Variable reluctance motors or steppers actually use rotors like those in figure below. Control methods of the switched reluctance motor in electric. Unlike common dc motor types, power is delivered to windings in the stator case rather than the rotor. Reconstruction of the switched reluctance motor stator in. Torque ripple minimization in switched reluctance motor. Switched reluctance motor srm the switched reluctance motor was designed for use in high power, high efficiency, variable speed drives. At the first mode of operation the motor phase voltage is connected to the dc supply voltage vs thus the motor phase current will be increases. It introduces the techniques for controlling switched reluctance machines, starting from first principles and building up to the most advanced forms of sensorless control. Faiz in 2010, can be also used torque control techniques for torque ripple reduction 61.
Rashidi torque ripple minimization in switched reluctance motor using passivitybased robust adaptive control i international journal of electrical and electronics engineering 5. Switched reluctance motor srm inverter design with the. This paper exhibits the survey of all the control procedures that can be connected to switched reluctance motor. P, pi, and pid were used for the simulation and after proper tuning using trial and error, the pid controller gave the best. Switched reluctance motor modes of operation converter. A switched reluctance motor is an electric motor in which the torque is produced by the tendency of its moveable part to move to a position of least reluctance, which corresponds to the position of maximum inductance miller 1993. It has wound field coils of a dc motor for its stator windings and has no coils or magnets on its rotor. Pdf speed control of 86 switched reluctance motor using. Pdf development of a new technique for performance. Sr motors require precise control to optimise the operating efficiency. Switched reluctance motor aims to disrupt the market.
Simulation and testing of a switched reluctance motor by. Introduction ths iappcoiailtn noet desbecirs the degsin o af sensoelrss. It works on the same principle as for stepper motor. By using this method we can well regulate the torque output of the motor with in hysteresis band. An important technique used for obtaining high performance. The reluctance motor is a type of synchronous machine. Switched reluctance motor drives modeling simulation. Switched reluctance motors are electrically commutated ac machines and are also known as variable reluctance motors. Index termsswitched reluctance machine, electric motor drive, current control, dynamics, torque ripple minimization. Switched reluctance motor drives modeling simulation analysis. A switched reluctance sr or variable reluctance motor does not contain any permanent magnets.
The simulink model is designed for the speed control of. Optim, switched reluctance motor, sensorless speed control, estimation of rotor position 1. In order to have selfstarting capability and bidirectional control, the rotor of a switched reluctance motor has lesser poles than the stator, whereas a synchronous reluctance motor has the same number of poles on stator and rotor. The switched reluctance motor has both salient pole stator and rotor, like variable reluctance motor nazar 1969, but they are designed for different applications, and therefore, with different performance requirements. Unlike a conventional synchronous motor, both the rotor. Switched reluctance motor features a switched reluctance sr motor is a rotating electric machine where both stator and rotor have salient poles. The pc master software referenced in this document is also known as free master software. In the last years, the switched reluctance machines srms have been the subject of significant developments. Switched reluctance motor srm inverter design with the drv8343q1 application report slvaen9january 2020 switched reluctance motor srm inverter design with the drv8343q1 anujnarain abstract switched reluctance motors srm are seeing a resurgence as motor manufacturers improve their. The stator winding comprises a set of coils, each of which is wound on one pole.
Switched reluctance motor srm is gaining much interest in industrial applications such as wind energy systems and electric vehicles due to its simple and rugged construction, high. On the other hand a switched reluctance motor is used in variable speed drives and naturally designed to operate efficiently for wide range of speed and torque and requires rotor position sensing. Dualrotor layouts provide more torque at lower price per volume or per mass. Different techniques are compared and the best and most efficient one is introduced. Pdf switched reluctance motor drives are one of the most promising alternatives of ac induction and permanent magnet synchronous motor drives.
While stepper motors are typically chosen for positioning applications, where step integrity and high resolution are important, switched reluctance motors are used in applications where power density is a primary concern. Irjet simulation of speed control techniques of switched. Control methods of the switched reluctance motor in. Industrial interest in switched reluctance motor srm drives has varied since 1850s. The variable reluctance motor is an evolution of the stepping motor and is generally designed for use in low power, open loop position and speed control systems where efficiency is not of prime importance. Switched reluctance motor aims to disrupt the market 27 february, 2018 a californian company has developed a new form of highefficiency switched reluctance motor which, it claims, will dramatically improve the performance of hvac, refrigeration, pumping and other applications. Switched reluctance motor aims to disrupt the market drives. The flux loops are shortened by making each two stator teeth incorporated in one magnetic circuit only. Kioskeridis, performance optimization in switched reluctance motor drives with online commutation angle control, ieee 8 c. Studying different types of power converters fed switched. There are a number of control techniques for sr motors. Switched reluctance motor srm inverter design with the drv8343q1 4.
They differ in the structure of the control algorithm and in position evaluation. Nonlinear modeling of a switched reluctance motor using. Husain in 2002 in 6264 while in 65 the ripple have been. Unlike a conventional synchronous motor, both the rotor and stator of a switched reluctance motor have salient poles. This book is intended for engineers in industry and in the large research community in electrical machines and drives. Switched reluctance motors the structure of a switched reluctance motor is shown below. Basically its kind of a stepper motor which rotates through a step angle when.
Nonlinear modeling of a switched reluctance motor using lssvm. Studying different types of power converters fed switched reluctance motor. A variable reluctance motor intended to move in discrete steps, stop, and start is a variable reluctance stepper motor. Simulation and testing of a switched reluctance motor by matlab simulink and dspace saman abbasian department of energy and environment faculty of electric power engineering chalmers university of technology the main objective of this thesis is to build and test a srm drive system to provide a research platform. The electromagnetic dynamic model of the motor and the load are expressed as shown in 6 6 where is the load torque, j is the moment of inertia of rotating masses and b is. The switched reluctance motor has a simple design with a m.
Srms are gaining much interest because of their simplicity in structures, highoutput power, high starting torque, wide speed range, rugged and robust construction, reliability, and low manufacturing costs, which make these machines viable for many applications. The system consists of pi controllers for speed and current control, a pulse width modulation pwmhysteresis controller regulator and commutation angle controller. The following figure shows the ideal waveforms phase a inductance and current in a 64 srm. Paper open access various control strategies on torque. Introduction the concept of switched reluctance motor srm was established in 1838 but the motor could not realize its full potential until the modern era of power electronics and computer aided electromagnetic design.
Systematic comparison of current control techniques for. The motor starts at anywhere from 300 to 400 percent of its full load torque depending on the rotor position of the unsymmetrical rotor with respect to the field winding as a two phase motor. This application describes a motor designed to operate as a reluctance machine at low speeds and as an induction machine at high speeds. To develop positive torque, the currents in the phases of a srm must be to the rotor position. The rotor has neither windings nor permanent magnets. This thesis presents a design method for a switched reluctance sr motor to optimise torque production for two types of 3 phase 64 poles srm and 86 poles srm designs. With continued research, different topologies have emerged presenting less torque ripple, high efficiency, high.
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