Download project documentsynopsis induction motors have been used widely in different fields ranging from domestic appliances to industrial machinery. So obviously the speed of an induction motor can be controlled by varying any of three factors namely supply frequency f, number of pole p or slip s. The user can quickly start evaluating the performance of the vhz system with this method. By using variable frequency control, it is possible to adjust the speed of the motor either above or below base speed. Ac induction motor volts per hertz control with speed.
Introduction this application note describes the design of a 3phase ac induction motor drive with volts per hertz control in closedloop vhz cl. The main methods employed for speed control of induction motors. Speed control of induction motor using cycloconverter. In the reference 3 different types of pwm strategies have been used for speed control of induction motor drive. Stator voltage control of induction motor control by ac. Pdf single phase induction motor speed control using pwm. Acpwm control for induction motor using pic microcontroller. Generally, it is known as the asynchronous motor because its running speed is less than its synchronous speed. Ac induction motor volts per hertz control with speed closed loop, driven by etpu on mpc5500, rev. This method of speed control is suitable for squirrel cage type of induction motors. This application note discusses the basics of an ac induction motor.
This necessitates a speed control mechanism that is efficient and is also safe to use. Different speed control methods of induction motor are explained below. Speed control of induction motor by variable frequency control. Speed control of single phase induction motor using ac. Induction motors are widely used electrical motors due to their reliability, low cost and robustness. Speed control of induction motors the speed of an induction motor is given as n 120fp 1s. Induction motor, synchronous motor and ac commutator motor.
In this paper vector control for speed control of threephase squirrel cage induction motor. Also the induction motor can be run in either of the two directions which is quite useful in many applications. This starter kit is particularly suited to drive 3phase brushless motors either ac induction or permanent magnet types and demonstrates how effectively the stm8 microcontrollers can be used in realworld motor control. It is hard to learn anything valueable from that page. The alternating current ac induction motor drive offers the same control capabilities as high performance four quadrant dc drives. In the present work, the simulation of speed control of motor.
Ac electric motor speed controller free pdf ebooks. An984, an introduction to ac induction motor control using. Therefore, the need of speed control methods for induction motor arises. Speed control of induction motor using pwm technique. Free download induction motor seminar ppt, pdf report. In industries mechanical loads should not only be driven but should also be driven at desired speed. It is based on freescales 56f800e microcontrollers. So what can we do to control the speed of an ac induction motor. Speed control of induction motor ac motor speed control methods an induction motor is basically a constant speed motor, that means, for the entire loading range, change in speed of the motor. Speed control of induction motor 7 ways to control. However, induction motors do not inherently have the capability of variable speed. The rotor speed of an induction motor is given by the equation shown below. The speed control of induction motor is done at the cost of decrease in efficiency and low electrical power factor.
Various induction motor speed control methods advantages. Oriental motor general catalog 201220 d6 introduction ac speed control motors overview of bhf series and fe100fe200 inverters are control circuits that control the power supply frequency and voltage applied to threephase induction motors in order to control. Acpwm control for induction motor is a system, that enables the singlephase ac motor to run at different speeds. Although ac induction motors are easier to design than dc motors, the speed and the torque control in various types of ac induction motors require a greater understanding of the design and the characteristics of these motors. Speed control methods of various types of speed control. Introduction this application note describes the design of a 3phase ac induction motor drive with volts per hertz control. Induction motor theory jerry bednarczyk, pe course content introduction the ac induction motor is well suited to applications requiring constant speed operation. Based on the working principle, there are mainly three types of ac motors. An843, speed control of 3phase induction motor using. Ac motor speed control and other motors ac induction motor speed.
We know that t he speed of the induction motor is given by, from the above equation, the speed of the motor. Ac induction motor speed control so what can we do to control the speed of an ac induction motor. This paper present the speed control of single phase induction motor using arduino with the controlling objectives pwm and spwm. The role of cycloconverter in speed control of induction motor is to vary the supply frequency which in turn, changes the speed of motor. An ac voltage controller is a device that is used to accomplish continuous variation of the rotor. Speed control of an induction motor there is a various method of speed control of an induction motor. The static frequency converter is an electronic unit. This work presents a speed control unit of a permanent split capacitor externalrotor singlephase induction motor for fan applications. As induction motors are widely being used, their speed control may be required in many applications. Methods of speed control of induction motor electrical. The drive application allows vector control of the ac induction motor running in a closed speed loop with the speed. The synchronous speed of an induction motor is a function of the number of stator poles.
Introduction the control of ac machine is basically classified into scalar and vector control. From the equation 1 it is clear that the motor speed. Speed control of induction motor using vector control. Effect of varying rotor resistance by adding external resistance to wound rotor motor speed control.
Speed control of induction motor ac motor speed control. A three phase induction motor is basically a constant speed motor so its somewhat difficult to control its speed. 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. Sometimes theyre talking about induction motors, other times not, and they dont specify which is which, or even which induction motor type they are talking about. Motor rotation when the rated ac supply is applied to the stator wind. Speed control of a three phase alternating current. Single phase induction motor and three phase induction motor. In this system, the scalar control vhz of induction motor experiments with and explores the use of speed control. Abstract induction motor im control is a difficult and complex engineering problem due to multivariable, highly nonlinear, timevarying dynamics and unavailability of measurements. This classification of induction motor is based on the type of power supply required for its operation. Before discussing the methods to control the speed. Generally an induction motor operates at almost constant speed. Speed control of three phase induction motor electrical4u. Three phase induction motor induction is one of the widest spread motor due to its robustness, simple construction, no need for complex circuits for starting.
Induction motor seminar ppt, pdf report study mafia. A properly designed variable frequency inductionmotor drive can be very flexible. One capture input is utilized to measure the motor speed. It can control the speed of an induction motor over a range from as little as 5% of base speed up to about twice base 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. The discussion is based on the dspicdem mc motor control development system, but you can use your own hardware if you choose. Pdf speed control of three phase induction motor using. The electric motor speed is fixed when ac motor is connected to ac line. The synchronous speed and therefore, the speed of the motor can be controlled by varying the supply frequency. By reducing stator voltage control of induction motor, speed of a highslip induction motor can be reduced by an amount which is sufficient for the speed control. A 3 phase induction motor can be used for different applications with various speed. Types of ac motor definition and classification of ac motor.
Out of all the electrical machines, induction motor is the most used machine in industries. A pulse width modulated pwm ac chopper that changes the. If you want to control induction motor speed, save yourself a lot of grief and get a 3phase motor. In this post let us see what are the various methods to control the speed of induction motor. Now speed of motor need to be change in many application3. More than 90% of motors used in industries are squirrel cage induction motor due to its rugged and maintenance free design. Speed control of induction motor by variable frequency control variable frequency control is a method which is used to control the speed of an induction motor. In general, the induction motor is cheaper and easier to maintain compared to other alternatives.
141 1313 875 684 858 1194 515 1360 478 379 444 232 245 742 250 210 318 886 917 311 438 8 6 273 1414 494 1394 814 97 1532 674 53 1057 976 182 1212 1350 1476 60 694 862 160 989 715 361