Nonlinear model predictive control, 20, ieee transactions on. Before discussing the methods to control the speed of three phase induction motor one should know the necessary formulas of speed. Control tutorials for matlab and simulink motor speed. Induction motor seminar ppt, pdf report study mafia. The result is a flat stator, or upper section, of iron laminations. Products marked with an asterisk have been introduced since the product catalog was released and are therefore not included in the printed.
The linear force is given by the equation shown below. An induction motor uses an alternating current in a stator, or stationary winding, to induce a magnetic field in a metal cage or wire winding as the rotor. Pdf principles of electrical machines book by vk mehta. This induces an electric field in a coil or squirrel cage to drive a rotor. More than 90% of motors used in industries are squirrel cage induction motor due to its rugged and maintenance free design. A comparison with the traditional induction motor model is also performed. Rotor speed is taken out from these equations and it is used as a scheduling variable. The advent of vector control techniques has solved induction motor control problems. Dec 23, 2017 the speed control of induction motor by considering to control on rotor side can subdivide into several speed controlling methods such as. If the motor slip is known, the rotor speed can be expressed by the equation. Induction motor speed control project serves this purpose of controlling the speed of the induction motor.
Scalar control is the term used to describe a simpler form of motor control, using nonvectorcontrolled drive schemes. This paper introduces a speed control of linear induction motor lim by using three different strategies of control. Characteristically, linear induction motors have a finite primary or secondary length, which generates endeffects. We can modulate the power of the ac line to vary the speed of the induction motor through ac driver circuitry. By using pwm strategies, in the reference 45 inverter is used to drive the speed of induction motor, ac choppers are used in the reference67 for the speed control of induction motor. Free download induction motor seminar ppt, pdf report. A 3phase induction motor uses current delivered in three phases in a sequence into the coils of a stator to create a rotating magnetic field. Then the level of the voltage signal a is determined. Fellah abstract in the present paper, the mover speed control of a linear induction motor lim using a. A typical frequency converter with a special induction motor series are shown on figure 1. Induction motor runs through direct ac line the amount of power given to it decides to what rpm it does rotates. The linear induction motor is designed for high speed operation. The bxii series brushless dc motor and driver packages offer high performance and high function, up to 4,000 rmin, for a wide range of applications. Simulink modeling page we generated two different dc motor models in simulink.
In the rotary induction motor, the speed of the secondary in the linear induction motor is less than the synchronous speed v s and is given as. The speed control of induction motor is done at the cost of decrease in efficiency and low electrical power factor. A linear induction motor lim is an alternating current ac, asynchronous linear motor that works by the same general principles as other induction motors but is typically designed to directly produce motion in a straight line. Nov 11, 2011 the linear induction motor is designed for high speed operation. However, recently, it has been increasingly used as variable speed motors driven by an inverter. Product catalog, except where noted with an asterisk. Numerous applications of lims can be found in industry today, one of the most interesting being high speed magnetic levitation railway systems. Speed control of a three phase induction motor using.
Methods of speed control of induction motor electrical. Pdf speed tracking of a linear induction motor enumerative. Speed control of vector controlled induction motors using. These files are taken from the 2018 2019 oriental motor u. A three phase induction motor is basically a constant speed motor. Generally, it is known as the asynchronous motor because its running speed is less than its synchronous speed. Speed control of an induction motor there is a various method of speed control of an induction motor. A linear induction motor lim is a specific type of alternating current ac, multiplephase machine that provides force and movement in a linear direction. Characteristically, linear induction motors have a finite primary or secondary length, which generates endeffects, whereas a conventional induction motor is arranged.
Ceitec central european institute of technology, brno university of technology, purkynova 123, brno, czech republic email. It is widely used in industry due to low cost and rugged construction. Abstract control of induction motor im is well known to be difficult owing to the fact the mathematical models of im are highly nonlinear and time variant. Linear induction motor a linear induction motor lim is an advanced version of rotary induction motor which gives a linear translational motion instead of the rotational motion. Power is nothing without control and whether it is for a roller coaster, a public transportation system or an industrial use, projects that require linear motion often have diverse and in many cases complex control requirements. The pulsed linear induction motor university of edinburgh. Speed control of linear induction motor with thrust and stator flux. The difference in speed between rotor, the synchronous speed and the rotating. Speed control of single phase induction motor using ac. Performance analysis of the linear induction motor for the deepunderground highspeed gtx 202 maximum speed should be around 34. Steady state response of speed, current and torque in induction motor are also obtained using this scheme. Generally an induction motor operates at almost constant speed as the load is varied.
The book principles of electrical machines book by vk mehta and rohit mehta is an ideal text for students who look to gain a current and clear understanding of the subject as all theories and concepts are explained with lucidity and clarity. In the reference 3 different types of pwm strategies have been used for speed control of induction motor drive. This slip power loss can be recovered and supplied back to improve the overall. Previously, to control the relative speed of the primary and secondary members of a linear induction motor it has been necessary to control the supply of current to the primary member using complex and expensive electronic circuitry. They are capable of speeds up to 1800 insec 45 ms and are typically used in applications where accurate positioning is not required. Read more methods of speed control of induction motor. This method is applicable to squirrel cage induction motor only.
An induction motor is practically a constant speed motor, that means, for the entire loading range, change in speed of the motor is quite small. In this paper, the mover speed control of a linear induction motor considering the endeffects compensation is proposed. The files listed below are available for you to download in pdf format. A three phase induction motor is basically a constant speed motor so its somewhat difficult to control its speed. Speed of a dc shunt motor can be varied very easily with good efficiency, but in case of induction motors, speed reduction is accompanied by a corresponding loss of efficiency and poor power factor. Oct 10, 1972 the invention relates to a speed control system for a linear induction motor. Speed control of linear induction motor using sliding mode. The speed set value d and the detected voltage e of the speed generated by a tachogenerator is compared in the comparison amplifier block. Jean thomas and anders hansson, speed tracking of a linear induction motor enumerative. The analysis has been done in terms of thd in their line current. Linear induction motor motion control h2w technologies.
Before discussing the methods to control the speed of three phase induction motor one should know the basic formulas of speed and torque of three phase. Performance analysis of the linear induction motor for the. From the equation 1 it is clear that the motor speed can be changed by a change in frequency f, a number of poles p, and slip s. Modeling of linear induction machines for analysis and control. As induction motors are widely being used, their speed control may be required in many applications.
Pdf speed control of linear induction motor using sliding. Speed control of linear induction motor considering endeffects. Succinctly divided in 14 chapters, the book delves into important concepts of the subject which include armature reaction and commutation. Induction motors have been traditionally used as constant speed motors supplied by the ac power source. Different speed control methods of induction motor are explained below. An induction motor can be defined as the ac electric motor device in which a power source fed by the alternating current with the help of a primary winding. Main applications of these machines are in highspeed ground transportation. A linear model of the system can be extracted from the simulink model into the matlab workspace. The interaction of the electric and magnetic fields drives the motor without any connections between the moving parts via a slip ring, making it highly reliable. Open loop control of induction motor im is used in this inverter scheme.
The most commonly used controller for the speed control of. We will now employ these models within simulink to simulate the system response and design different approaches to control. The 3phase set of currents, each of equal magnitude and with a phase. Department of control and instrumentation, faculty. Pdf in the present paper, the mover speed control of a linear induction motor lim using a sliding mode control design is proposed. The lims 3phase coil assembly can be directly connected to the ac line for single speed applications or to an adjustable frequency drive for variable speed control. Chapter 3 induction motor and different speed control methods page no 3. Force engineering ltd linear induction motor control. A linear induction motor provides linear force and motion rather than rotational torque. Constant cooling by integrated forced ventilation independent of motor speed provides high continuous torque capability at low speed in servodrive applications machine tools. Dec 17, 2019 when the speed control of three phase induction motor is done by adding resistance in rotor circuit, some part of power called, the slip power is lost as i 2 r losses.
Linear electric motors lems belong to the group of special electrical machines. Variable voltage variable frequency speed control of. Then for the main motor, synchronous speed is 120f 1. End effects and other geometry subtleties of a linear motor make it unique, and a means of optimizing efficiency with both the motor geometry and the motor control scheme will be analyzed to create a highspeed linear induction motor lim with a higher efficiency than what is possible with conventional motors and controls. Jean thomas and anders hansson, speed tracking of a linear induction motorenumerative. It also illustrates the usage of dedicated motor control libraries that are included in the sdk. The driver is user friendly with easy wiring, data setting and led display on the front panel and is compact and easy to mount. High speed linear induction motor efficiency optimization.
The basic idea of an electric motor is to generate two magnetic fields. Zimmerman pulsed power sciences center sandia national laboratories, albuquerque, nm 87 185 abstract the seraphim segmented rail phased induction motor concept is a linear induction. The rotor will constantly be turning to align its magnetic field with that of the stator field. Speed control of three phase induction motor electrical4u. Jun 05, 2018 out of all the electrical machines, induction motor is the most used machine in industries.
Perphase equivalent circuit of a linear induction motor lim. May 31, 2019 a linear induction motor or lim is a special type of induction motor used to achieve rectilinear motion rather than rotational motion as in the case of conventional motors. Robust controller is designed using hybrid currentflux dq equations of an induction machine. The pulsed linear induction motor concept for highspeed trains b. The speed control of induction motor is done at the price of reduce in efficiency and low power factor. Ac induction motor speed control so what can we do to control the speed of an ac induction motor.
The invention relates to a speed control system for a linear induction motor. Citations 223 references 0 direct thrust control of a linear induction motor using a reducedswitch threelevel converter. The pulsed linear induction motor concept for high speed trains b. In this paper the speed control method of lim, which lead to optimal control characteristic of motor such as thrust, flux and current, is proposed. Application of the linear induction motor to highspeed. Controlling 3 phase ac induction motors using the pic18f4431. The control scheme as thrust, flux and current, is proposed.
The speed of induction motor can be varied by changing supply voltage. End effects and other geometry subtleties of a linear motor make it unique, and a means of optimizing efficiency with both the motor geometry and the motor control scheme will be analyzed to create a high speed linear induction motor lim with a higher efficiency than what is possible with conventional motors and controls. Speed control of linear induction motor using sliding mode controller considering the end effects a. Jun 30, 2015 a three phase induction motor is basically a constant speed motor. Speed control methods of various types of speed control motors. Speed control of linear induction motor using sliding mode controller considering the end effects article pdf available in journal of electrical engineering and technology 71. Therefore the efficiency of three phase induction motor is reduced by this method of speed control. The linear induction motor offers considerable advantage at high speeds, it is not. Pdf speed control of linear induction motor using sliding mode. Controlling 3 phase ac induction motors using the pic18f4431 pdf this application note describes how the pic18f4431 may be used to control an acim using open and closedloop vf control strategies. First of all mentions linear induction machines in 1890, only two years after the discovery of. In a traditional electric motor, the rotor rotating part spins inside the stator static part in a linear motor, the stator is unwrapped and laid out flat and the rotor moves. In this way, the slip power of main motor is fed to the auxiliary induction motor at a frequency of f 2 s 1 f 1 let us now assume that p 1, p 2 and s 1, s 2 be the number of poles and slips respectively.
Speed tracking of a linear induction motorenumerative. Linear induction motors are quite an engineering marvel, to convert a general motor for a special purpose with more or less similar working principle, thus enhancing its. Linear motors are electric induction motors that produce motion in a straight line rather than rotational motion. A three phase induction motor is mostly a constant speed motor so its fairly not easy to control its speed. The linear induction motor science publishing group. The torque developed in this method is proportional to the square of the supply voltage. Speed control of a three phase induction motor using pwm. Introduction linear electric motors lems belong to the group of special electrical machines. Adding an external resistant into rotor side circuit.
Main applications of these machines are in highspeed ground transportation, sliding doors, flexible manufacturing systems, robotic systems, etc. The performance of the proposed dtfc method is analyzed with considering endeffect. The page also covers the construction and working principle of the linear induction motor along with the derivation of expression of speed. Where s is the slip of the linear induction motor and is given as. Pdf direct torque control is considered as one of the most efficient techniques for speed andor position tracking control of induction motor drives find, read. The voltage signal a is low when the speed detected value to the speed.
The application serves as an example of ac induction vector control drive design using a motorola dsp with sdk support. A linear induction motor lim is a noncontacting, high speed, linear motor that operates on the same principal as a rotary, squirrel cage, induction motor. Slip, which varies from and 1 when the rotor is at rest. The speed torque curve of a squirrel cage induction motor and the soft starter, 2892016 duration. Methods of speed control of induction motor electrical concepts. Pdf programmable logic control based simultaneous speed. The rotor speed of an induction motor is given by the equation shown below. The shape and operation of a linear induction motor can be visualized as depicted in the figure by making a radial cut in a rotating induction machine and flattening it out. The speed control of induction motor by considering to control on rotor side can subdivide into several speed controlling methods such as. In this type of motor, the stator and rotor are called primary and secondary respectively.
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