It is widely used in industry due to low cost and rugged construction. Chapter 3 induction motor and different speed control methods page no 3. The most popular type is the 3 phase, squirrelcage ac induction motor. A singlephase motor is a rotating machine that has both main and auxiliary windings and a squirrelcage rotor. Low cost, low maintenance, simple construction, reliability and high efficiency. In the case of three phase ac alternating current operation, the most widely used motor is a 3 phase induction motor, as this type of motor does not require an additional starting device. Pdf on oct 1, 2016, sachin hegde and others published speed. View the article online for updates and enhancements. Speed control of a three phase induction motor by stator voltage variation is straightforward, simple, economical and as. This 3 phase motor is also called as an asynchronous motor. How to control the speed of three phase induction motor.
The three phase induction motor has following advantages. An electrical motor is an electromechanical device which converts electrical energy into mechanical energy. Threephase induction motor singlephase induction motor there are probably more singlephase ac induction motors in use today than the total of all the other types put together. For the love of physics walter lewin may 16, 2011 duration. A theoretical background on scalar motor control principle. The three phase induction motor or synchronous motor is used as ac drive. They run at a constant speed from noload to the full load.
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. To do so, a vfd variable frequency drive is used for controlling the speed of a threephase induction motor with variable load attached to the motor. Speed of a 3 phase induction motor can be controlled by these methods. A variable frequency drive vfd is used to control the speed of motor with the primary voltage control method. In this application note, we will generate a third pwm in software, using a general purpose timer and an io pin resource that are readily available on the picmicro microcontroller. The switches are controlled by pulses created by the pic microcontroller. Pdf speed control of induction motors kamakhya basumatary. In a 3phase ac induction motor, there are three stator windings, each usually in two halves, with the rotor winding shortcircuited by end rings. The most popular type is the 3phase, squirrelcage ac induction motor. Pdf speed control of 3phase induction motor using single. Speed control of an induction motor there is a various method of speed control of an induction motor.
I need a 3 phase sine wave with 120 deg phase displacement with vf 1khz control as output please help thanks a ton. The main aim of the project dealt with the concept of speed control of a threephase induction motor with energy saving. Speed control methods of various types of speed control motors. So by changing the supply frequency, the number of stator poles and slip we can change the speed of. In a 3 phase ac induction motor, there are three stator windings, each usually in two halves, with the rotor winding shortcircuited by end rings.
A successful salesman for general electrics motor division once remarked to one of your instructors that, when asked by a customer how a motor. Design of vfd drive for a 3phase induction motor open. The actual speed of three phase asynchronous motor is given by n. Single phase induction motor speed control this project is designed to control the speed of a singlephase induction motor by using. The threephase ac induction motor is a rotating electric machine that is designed to operate on a threephase supply. Speed control in three phase induction motor mcqs with ans. The 3phase set of currents, each of equal magnitude and with a phase. Speed control in three phase induction motor mcqs with answers q1. Performance of threephase induction motor the speed of the rotating field synchronous. The singlephase ac induction motor best fits this description. Ppt induction motor powerpoint presentation free to.
The speed of a three phase induction motor is given by, n n s 1s and n s 120fp this shows the speed of three phase induction motor depends upon synchronous speed n s and slips. Speed control of a three phase alternating current. Pdf speed control of three phase induction motor using. The implementation is done using a rectifier and an inverter, where the pwm triggering pulses were generated by using pic micro controller for switching the igbts of the inverter. The rotor speed of an induction motor is given by the equation shown below. Generally, it is known as the asynchronous motor because its running speed is less than its synchronous speed. The space vector pulse width modulation speed control of a three phase alternating current induction motor for the control of various parameters is designed. Speed control of three phase induction motor ppt play ppt. The threephase induction motor is the extensively used for various kinds of industrial drives. Supplying of both main and auxiliary windings enables the singlephase machine to be. Lecture 6 three phase induction motors cairo university. 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. Speed control of induction motor speed control of induction motor by vf method speed control of three phase induction motor with universal controller 3 phase induction motor pdf three phase induction motor the wound rotor induction motor three phase induction motor diagram induction motor problems and solutions pdf blocked circle diagram of an.
Speed control of induction motor using vector control. As the current passes through the coils on opposite sides of the stator, a twopole electromagnet is established, creating a twopole motor. Advantages of 3 phase induction motor generally easy to build and cheaper than corresponding dc or synchronous motors induction motor is robust. Speed control of three phase induction motor electrical4u. Speed control of 3phase induction motor microchip technology. The principle of operation of this motor is based on. The basis of fuzzy logic controlling is the value of data between absolute truth and absolute false rather than the value of absolute truth and false. Abstract the paper describes the open loop control of the 3 phase induction motor at variable speed using a 3 phase inverter. There are following methods of speed control of three phase induction motor.
The synchronous speed of induction motor depends upon supply frequency and the number of stator poles. The block uses the threephase input voltages to regulate the individual phase currents, allowing control of the motor torque or speed. The speed of a threephase induction motor driving a given load is determined by matching the torquespeed characteristics of the motor and load, as shown in fig. Speed control of three phase squirrel cage induction motor using vf method is implemented. The user can quickly start evaluating the performance of the vhz system with this method.
The conventional method has to be modified with advanced control techniques. The best suited method for smooth speed control by controlling number of poles is a. The old post triac based motor speed control, if we avoid the pwm control section and power circuit use for just on and off for a low voltage three phase induction motor 100 volt to 150 volt frequently with help of a on off sensor,in 100 or more voltage,motor too hot after some time running. How to control the speed of 3 phase induction motor quora. By default, the block sets the simulation type parameter to continuous to use a continuous sample time during simulation. In this system, the scalar control vhz of induction motor experiments with and explores the use of speed control. The speed control of induction motor is done at the cost of decrease in efficiency and low electrical power factor. There are two basic reasons for the use of singlephase motors rather than 3phase motors. The 3 phase inverter with 3 legs use igbts as switches for the generation of 3 phase output.
I am using irs2336 as gate driver and trying to control torque of 6hp induction motor. The 3 phase inverter is supplied from a 400v dc supply. Proposed circuit arrangement for speed control of three phase induction motor. Keywords cycloconverter, split phase induction motor i.
There are three speed control motor product groups. Free download induction motor seminar ppt, pdf report. Stator frame it is the outer most part of the three phase induction motor. In the speed control of three phase inductor there are several method like frequency control, stator voltage control, vf control and rotor resistance control are used. Speed control of three phase induction motor electrical. Speed control of three phase squirrel cage induction motor. The system is developed using the various toolboxes available in the library such as power system, power electronics, control systems, and signal processing toolboxes and fro m its basic. Be careful it can hurt to tangle with a threephase motor. The torque profile of a three phase asynchronous or induction motor is an indicator of the load. The basic idea of an electric motor is to generate two magnetic fields. Pdf speed control of 3phase induction motor using volthertz. The main purpose of controlling the speed of three phase induction motor is to save unwanted energy. Motor drive ac motors induction wound rotor synchronous permanent magnet synchronous reluctance motors motor. Introduction speed control of induction motor is necessary in industrial applications.
Dongchoon lee and youngsin kim, control of single phase to three phase acdcac pwm converters for induction motor dri ves, ieee trans actions on industrial electronics a pril 2007. This paper presents the design of a xilinx field programmable gate array fpga based sinusoidal pulse width modulation spwm for a three phase voltage source inverter vsi with variable voltage variable frequency vvvf for controlling the speed. Speed control of induction motor using triac proceedings of 18th thirf international conference, 11 january 2015, pune, india, isbn. Which is used to control the frequency of three phase converter using pulse width. 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. It is logical that the least expensive, lowest maintenance type motor should be used most often. Its main function is to support the stator core and the field winding. Simulation diagram this is the simulation diagram for induction motor. Design of a plcbased variable load, speed control system for a threephase induction motor conference paper pdf available january 2016 with 3,596 reads how we measure reads. The rotor will constantly be turning to align its magnetic field with that of the stator field.
Speed control of induction motor using cycloconverter. Speed control of three phase induction motor youtube. Simulation of vector control of induction motor using simulink program vector control of three phase induction motor is simulated by the block diagram and sfunction as shown in figures. There are several methods for the speed control of induction motor. Speed control of a three phase induction motor using field. The induction motor block implements a threephase induction motor. Speed control of induction motor 7 ways to control. The three phase induction motors are simple in construction, rugged, low cost and easy to maintain. Speed control of three phase induction motor free educational videos. This application note also covers the basics of induction motors and. A three phase induction motor is basically a constant speed motor.
Today i will discuss very important topic speed control of induction motor. Ac induction motors are also the most common motors used in main powered home appliances. The method which can be used for the speed control of induction motor from stator side is. Svpwm based speed control of induction motor with three. Pwms, one less than the three required to control a 3phase induction motor. The ac speed control motor unit that uses the most popular singlephase capacitorrun induction motor, the small and highly efficient brushless dc motor unit, and the inverter unit that combines a threephase induction motor with a small inverter. These types of motors are known as selfstarting induction motors. An843, speed control of 3phase induction motor using. Speed control of a three phase induction motor fed from a single.