The three phase induction motor has following advantages. The actual speed of three phase asynchronous motor is given by n. 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. Speed control of three phase induction motor electrical4u. Currently the use of threephase induction machines has been increased tremendously in industrial applications due to several methods available to control the speed and torque of the motor. The user can quickly start evaluating the performance of the vhz system with this method. Speed control of induction motor 7 ways to control. Single phase induction motor speed control this project is designed to control the speed of a singlephase induction motor by using. Stator frame it is the outer most part of the three phase induction motor. Pdf on oct 1, 2016, sachin hegde and others published speed. Which is used to control the frequency of three phase converter using pulse width.
I need a 3 phase sine wave with 120 deg phase displacement with vf 1khz control as output please help thanks a ton. Speed control in three phase induction motor mcqs with. Its main function is to support the stator core and the field winding. Speed control of three phase squirrel cage induction motor. Pwms, one less than the three required to control a 3phase induction motor. The rotor speed of an induction motor is given by the equation shown below. These types of motors are known as selfstarting induction motors. Speed control of induction motor using vector control. The induction motor block implements a threephase induction motor. The 3phase set of currents, each of equal magnitude and with a phase. Speed of a 3 phase induction motor can be controlled by these methods. Advantages of 3 phase induction motor generally easy to build and cheaper than corresponding dc or synchronous motors induction motor is robust. Free download induction motor seminar ppt, pdf report.
The best suited method for smooth speed control by controlling number of poles is a. 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 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. 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. Speed control of a three phase induction motor using field. Design of vfd drive for a 3phase induction motor open. 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. A singlephase motor is a rotating machine that has both main and auxiliary windings and a squirrelcage rotor. Speed control of three phase induction motor ppt play ppt. Pdf speed control of induction motors kamakhya basumatary. The most popular type is the 3 phase, squirrelcage ac induction motor. 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. The 3 phase inverter is supplied from a 400v dc supply. Cycloconverters are used in very large variable frequency drives with ratings from few.
It is widely used in industry due to low cost and rugged construction. Speed control methods of various types of speed control motors. Ppt induction motor powerpoint presentation free to. It is logical that the least expensive, lowest maintenance type motor should be used most often. 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. 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. The space vector pulse width modulation speed control of a three phase alternating current induction motor for the control of various parameters is designed.
Low cost, low maintenance, simple construction, reliability and high efficiency. 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. Speed control of an induction motor there is a various method of speed control of an induction motor. The principle of operation of this motor is based on. Speed control of three phase induction motor electrical. An electrical motor is an electromechanical device which converts electrical energy into mechanical energy. The speed control of induction motor is done at the cost of decrease in efficiency and low electrical power factor. The conventional method has to be modified with advanced control techniques.
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. How to control the speed of 3 phase induction motor quora. Speed control of a three phase induction motor fed from a single. Proposed circuit arrangement for speed control of three phase induction motor. By default, the block sets the simulation type parameter to continuous to use a continuous sample time during simulation. Pdf design of a plcbased variable load, speed control. For reason of economy, most houses, offices and also rural areas are supplied with single phase a. There are three speed control motor product groups. Abstract the paper describes the open loop control of the 3 phase induction motor at variable speed using a 3 phase inverter. Today i will discuss very important topic speed control of induction motor. 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.
The threephase ac induction motor is a rotating electric machine that is designed to operate on a threephase supply. Introduction speed control of induction motor is necessary in industrial applications. Speed control of three phase induction motor free educational videos. 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 3phase induction motor microchip technology. Pdf speed control of 3phase induction motor using volthertz. It certainly leads to the best performance and high efficiency of the induction motor. 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. There are two basic reasons for the use of singlephase motors rather than 3phase motors. A three phase induction motor is basically a constant speed motor so its somewhat difficult to control its speed. Speed control of three phase squirrel cage induction motor using vf method is implemented. Speed control of induction motor using triac proceedings of 18th thirf international conference, 11 january 2015, pune, india, isbn. Simulation diagram this is the simulation diagram for induction motor.
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. 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. Performance of threephase induction motor the speed of the rotating field synchronous. The switches are controlled by pulses created by the pic microcontroller. The main aim of the project dealt with the concept of speed control of a threephase induction motor with energy saving.
The method which can be used for the speed control of induction motor from stator side is. Keywords cycloconverter, split phase induction motor i. The 3 phase inverter with 3 legs use igbts as switches for the generation of 3 phase output. 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. Chapter 3 induction motor and different speed control methods page no 3. The rotor will constantly be turning to align its magnetic field with that of the stator field. Motor drive ac motors induction wound rotor synchronous permanent magnet synchronous reluctance motors motor. For the love of physics walter lewin may 16, 2011 duration. 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. There are several methods for the speed control of induction motor. Speed control of a three phase alternating current. The three phase induction motors are simple in construction, rugged, low cost and easy to maintain. Speed control of induction motor using vf technique phase i a thesis submitted in.
A theoretical background on scalar motor control principle. In this system, the scalar control vhz of induction motor experiments with and explores the use of speed control. Speed control of a three phase induction motor by stator voltage variation is straightforward, simple, economical and as. The three phase induction motor or synchronous motor is used as ac drive.
The main purpose of controlling the speed of three phase induction motor is to save unwanted energy. Induction motor seminar ppt, pdf report study mafia. The threephase induction motor is the extensively used for various kinds of industrial drives. Speed control in three phase induction motor mcqs with ans. A three phase induction motor is basically a constant speed motor. Lecture 6 three phase induction motors cairo university. The most popular type is the 3phase, squirrelcage ac induction motor. So by changing the supply frequency, the number of stator poles and slip we can change the speed of. A successful salesman for general electrics motor division once remarked to one of your instructors that, when asked by a customer how a motor.
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. Svpwm based speed control of induction motor with three. The singlephase ac induction motor best fits this description. Speed control in three phase induction motor mcqs with answers q1. This application note also covers the basics of induction motors and. I am using irs2336 as gate driver and trying to control torque of 6hp induction motor. How to control the speed of three phase induction motor. A variable frequency drive vfd is used to control the speed of motor with the primary voltage control method. The block uses the threephase input voltages to regulate the individual phase currents, allowing control of the motor torque or speed. They run at a constant speed from noload to the full load. Pdf speed control of three phase induction motor using. As the current passes through the coils on opposite sides of the stator, a twopole electromagnet is established, creating a twopole motor. Ac induction motors are also the most common motors used in main powered home appliances. An843, speed control of 3phase induction motor using.
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. There are following methods of speed control of three phase induction motor. This 3 phase motor is also called as an asynchronous motor. Generally, it is known as the asynchronous motor because its running speed is less than its synchronous speed. The basic idea of an electric motor is to generate two magnetic fields.