We will now employ these models within simulink to simulate the system response and design different approaches to control. They are capable of speeds up to 1800 insec 45 ms and are typically used in applications where accurate positioning is not required. Design, construct, and test a linear induction motor lim powered by a threephase voltage input rotate a simulated linear track and cannot exceed 1,200 rpm monitor speed, output power, and input frequency controllable output speed 7 5. Sumit thakur mechanical free download induction motor seminar ppt, pdf report. This paper present the speed control of single phase induction motor using arduino with the controlling objectives pwm and spwm.
Speed control of linear induction motor using sliding mode. The speed of a threephase induction motor driving a given load is determined by matching the torque speed characteristics of the motor and load, as shown in fig. This paper concentrates on a novel fieldweakening speed control strategy for lim drive in which the end effect is taken into account. Background of the invention the invention relates to a speed control system for a linear induction motor. Control of traction and levitation of linear induction. However, induction motors do not inherently have the capability of variable speed of operation. When focusing attention on the speed control segment of the motor market, servo and stepper motors control their speed with a pulse train, while the induction motor and the brushless dc motor control speed with an external resistor andor dc voltage. Before discussing the methods to control the speed of three phase induction motor one should know the necessary formulas of speed. Noida abstract this paper presents a technique to control. In a linear induction motor lim, the primary inverter is directly controlled by the inverter switching winding corresponds to the stator winding of a rotary states selected using switching table. Performance analysis of the linear induction motor for the deepunderground high speed gtx chanbae park, hyungwoo lee and ju lee abstract in order to develop a deepunderground great train express gtx in south korea, the specifications decision and development of a traction control system including an inverter and a. Simulink modeling page we generated two different dc motor models in simulink.
Speed control methods of induction motor pdf speed control methods of the various speed control motors. Performance analysis of the linear induction motor for the. Different speed control methods of induction motor are explained below. Speed control induction motor pdf 8 speed control of induction machines. Speed control of linear induction motor using sliding mode controller considering the end effects linear induction motor. In this type of motor, the stator and rotor are called primary and secondary respectively.
The speed control of induction motor is done at the price of reduce in efficiency and low power factor. Rating considerations dimensions of a machine depend on torque at a specific speed how intensively the magnetic circuit is used. The frequency and speed of the motor, with respect to. Speed control of single phase induction motor using triac. 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. A linear model of the system can be extracted from the simulink model into the matlab workspace. The linear induction motor is designed for high speed operation. Linear induction motor lim is an asynchronous motor, working on the same principle an induction motor works, but is designed to produce the rectilinear motion, unlike the rotary movement produced by a motor. Harley and yao duan georgia institute of technology november, 2009. A linear induction motor provides linear force and motion rather than rotational torque. It is widely used in industry due to low cost and rugged construction. Accurate vector control of a linear induction motor lim drive is a complicated subject because of the end effect phenomenon especially in the fieldweakening region.
Field orientated control of 3phase ac motors 2 the machine models and characteristics used are valid only in steady state. Speed control methods of various types of speed control motors. Extended kalman filter ekf is applied to estimate lim speed by measuring motor voltages and currents. A three phase induction motor is mostly a constant speed motor so its fairly not easy to control its speed. The files listed below are available for you to download in pdf format. Generally, it is known as the asynchronous motor because its running speed. 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.
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. Control of traction and levitation of linear induction motor driven by power source with frequency component synchronous with the motor speed abstract. An induction motor can therefore be made without electrical connections to the rotor. An induction motor or asynchronous motor is an ac electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. P417 bechar 08000, algeria 2university of sciences and technology of oran, algeria abstract in this paper, an adaptive backstepping control system with a fuzzy integral action is. What are the applications of speed control of a motor. The function and the performance required for these motors are wideranging. The most important practical case is fan speed control in which the. The operating point is the intersection of the two characteristics and we can fix for a given load and motor. Speed tra cking of a linear induction motor enumerative. An843 ds00843apage 2 2002 microchip technology inc. The most commonly used controller for the speed control of.
One component defines the magnetic flux of the motor, the other the torque. There is a various method of speed control of an induction motor. Linear motors are electric induction motors that produce motion in a straight line rather than rotational motion. 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. Ac motor drives can be broadly categorized into two types, thyristor based and transistor. A three phase induction motor is basically a constant speed motor. An induction motors rotor can be either wound type or squirrelcage type. A three phase induction motor is basically a constant speed motor so its somewhat difficult to control its speed. Mover position control of linear induction motor drive using adaptive backstepping controller with integral action i. We cant imagine our life without speed control of a motor, because nowadays all moving equipment works with the help of motor, it may be a ac motor,dc motor or a servomotor. The induction motor is made up of the stator, or stationary windings, and the rotor. They can be used in control of motors used in conveyors and other machinery.
The rotor speed of an induction motor is given by the equation shown below. Speed control of vector controlled induction motors using. In general, the induction motor is cheaper and easier to maintain compared to other alternatives. Speed control of induction motor 7 ways to control. Linear induction motor motion control h2w technologies.
Induction motors are widely used electrical motors due to their reliability, low cost and robustness. 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 the present paper, the mover speed control of a linear induction motor lim using a sliding mode control design is proposed, considering the end effects. Abstract direct torque control is considered one of theas most efficient techniques for speed andor position tracking control of induction motor drives. Product catalog, except where noted with an asterisk. This study proposes a speed estimation scheme for the sensorlessvectorcontrolled linear induction motor lim drives for mediumlow speed maglev applications, which is composed of two parts. The ac induction motor is well suited to applications requiring constant speed operation.
Numerous applications of lims can be found in industry today, one of the most interesting being high speed magnetic levitation railway systems. 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. A linear induction motor lim is a specific type of alternating current ac, multiplephase machine that provides force and movement in a linear direction. This causes the control to allow high peak voltage and current transients. Traditional design of cage rotor induction motors ronald g. As induction motors are widely being used, their speed control may be required in many applications. Electric motor electric motor linear induction motors.
Pdf programmable logic control based simultaneous speed. 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. An843, speed control of 3phase induction motor using. This paper presents a sensorless system drive on primary flux oriented control pfoc and secondary flux oriented control sfoc for the linear induction motor lim with taking into account end effect. These damage not only the drive dynamic performance but also the power conversion efficiency. Control tutorials for matlab and simulink motor speed. The advent of vector control techniques has solved induction motor control problems. Mover position control of linear induction motor drive. Vector control, also called fieldoriented control foc, is a variablefrequency drive vfd control method in which the stator currents of a threephase ac electric motor are identified as two orthogonal components that can be visualized with a vector. Speed control of three phase induction motor electrical4u. Scalar control is the term used to describe a simpler form of motor control, using nonvectorcontrolled drive schemes. Motor speed control by variable frequency vfd determining motor circuit parameters. 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. 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.
Speed control of a three phase induction motor using pwm. 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. Speed control of 3phase induction motor using pic18 microcontrollers. These files are taken from the 2018 2019 oriental motor u. The speed control of induction motor is done at the cost of decrease in efficiency and low electrical power factor.