Abstractthe implementation of a monitoring and control system for the induction motor based on programmable logic con. Whats the difference between asynchronous and synchronous. Speed control of a three phase induction motor using pwm inverter. The motor is mounted in a test rig that allows one to control the torque applied to the motor shaft and to measure both rpm and torque. Pdf induction motor speed control using power line. The asynchronous nature of inductionmotor operation comes from the slip between the rotational speed of the stator field and somewhat slower speed of. Conclusion to control the speed of induction motor inverters are commonly used, but in this project ac chopper is implemented to control speed of single phase induction motor by implementing the asymmetrical pwm method the efficiency of the motor is improved. The application serves as an example of ac induction vector control drive design using a motorola dsp with sdk support.
You should also make a dc measurement of stator winding linetoline resistance using a dmm. Dc motor speed control system the speed control of a motor is frequently required in industrial applications, robotics, home. Download project documentsynopsis induction motors have been used widely in different fields ranging from domestic appliances to industrial machinery. Component of speed control of im by plc miniature circuit breaker mcb. Induction motor control is complex due to its nonlinear characteristics. Performance evaluation between plc and pid controllers. The difference in speed between rotor, the synchronous speed and the rotating. Vfd fed three phase induction motor im using programmable logic controller plc. In this post let us see what are the various methods to control the speed of induction motor. Single phase induction motor speed control using microcontroller. 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. Control system design the pid controller is designed to control motor speed based on incoming information of system and auto tuning and its parameters have been tuned for receiving best stability and overshoot and settling time.
Speed control of an induction motor there is a various method of speed control of an induction motor. Using programmable logic controller plc with profibus cable and three sensors, the speed of the induction motor is controlled easily. In this study, the plc measures the voltage, the temperature, current and the speed of. Controlling 3 phase induction motor using vfd and plc. The most popular type is the 3phase, squirrelcage ac induction motor. Induction motors are widely used in industry because of their rigidity and speedcontrol flexibility. 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. Ac motors, controllers, and variable frequency drives. The plc over the motor cables of inverterfed electric drives is studied, for example in 37, coupling methods are compared in 8, powering of modems and sensors at the motor end in 9 and.
This induces an electric field in a coil or squirrel cage to drive a rotor. Conclusion to control the speed of induction motor inverters are commonly used, but in this project ac chopper is implemented to control speed of single phase. This will reduce the need for additional motors because the same motor may be used to drive different devices. The system also involves the use of a speed control system which can adjust the speed to desired value. Speed control of three phase induction motor electrical4u. The speed control using pi and pid control modes is explained and an implementation of the controller using opamps is given. This manual is intended to help users of variable speed drives successfully install. Various control schemes have been used to operate the. A power factor controller for a threephase programmable logic controllers plcs. How to control the speed of an induction motor quora.
The analysis has been done in terms of thd in their line current. The single phase bridge rectifier is connected with the isolation transformer. The induction motor drives a variable load, is fed by an inverter, and the plc controls. Three phase induction motor speed control using frequency. The implementation of a monitoring and control of a variable. In todays world industries demand process automation in all sectors, because automation results in better quality, increased production and. Steady state response of speed, current and torque in induction motor are also obtained using this scheme. An induction or asynchronous motor is an ac electric motor in which the electric. The vfd can be controlled remotely by using plc dcs systems the plc has to give set point for vfd drive to control the motor speed, this can achieved either automatically from the plc or by the operator action from the hmi. Vsds on the other hand, vary voltage in order to control a dc motor. The frequency and speed of the motor, with respect to the input supply, is. Chapter 3 induction motor and different speed control methods page no 3. Induction motor fault detection, protection and speed.
Speed control of single phase induction motor using ac. Variable voltage variable frequency speed control of. Speed control of induction motor servo drives using. Three phase induction motor are widely used motor in industry because of its rugged construction and negligible maintenance. Design and implementation of plcbased monitoring control. Therefore, the problem of induction motor protection attracted many researchers. Speed control of induction motor by variable frequency control. Jul 10, 2010 plc software must therefore be maintainable and extensible. In a hostile environment, speed sensors can not even be mounted. At edge control level, schneider electric plc, pac and dedicated controllers are easy to program, commission, maintain and are iiot ready.
Then, by pushing the manual start pushbutton, the motor begins. Parameter symbol value 1 supply frequency f 50 hz 2 voltage v. The induction motor im is one of the most common electrical motor used in most applications. Can i reverse the rotation direction of the ac induction motor if i. 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. Pdf protection of induction motor using plc researchgate.
For the manual control, the scheme is equipped with start. Jun 06, 2016 speed control of induction motor using plc and vfd 1. A properly designed variable frequency induction motor drive can be very flexible. 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. Before discussing the methods to control the speed of three phase induction motor one should know the necessary formulas of speed. Control of induction motors by using programmable logic. There are more than one methods to control the speed of induction motor, you can choose one depending on your resources, efficiency required etc. The synchronous speed of an induction motor is given by the relation shown below. Siemens standard drives application handbook siemens industry. The dc motor is an attractive part of electrical equipment. A properly designed variable frequency inductionmotor drive can be very flexible. Vfds control an ac motors speed by varying the motors frequency. Also the induction motor can be run in either of the two directions which is quite useful in many applications. By using variable frequency control, it is possible to adjust the speed of the motor either above or below base speed.
Vf speed control of three phase induction motor by using plc and scda. The synchronous speed and therefore, the speed of the motor can be controlled by varying the supply frequency. An843, speed control of 3phase induction motor using. We know that t he speed of the induction motor is given by, from the above equation, the speed of the motor can be controlled by changing supply frequency and by changing number of poles in the stator. Speed control of induction motor by using inverter vfd. The speed control of induction motor is done at the price of reduce in efficiency and low power factor. In this study, the plc measures the voltage, the temperature, current and the speed of an induction motor through analog inputs. This induces an electric field in a coil or squirrel cage to drive a. In this article, a speed controller for dc motor is designed and illustrated using fuzzy logicbased programmable logic controller plc. The main reason is that the speed sensor spoils the ruggedness and simplicity of induction motor. 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. This motor runs at a speed less than its synchronous speed, therefore it is also called as asynchronous motor.
Various control schemes have been used to operate the induction motor in speed and position control modes of operation using plc programming. 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. Nov 15, 2011 for the induction motor are given and their implementation in simulink is outlined. Steady state response of speed, current and torque in induction. Sensorless speed and position control of induction motor. Various induction motor speed control methods advantages.
Hybrid method for customized control of induction motor. The asynchronous nature of induction motor operation comes from the slip between the rotational speed of the stator field and somewhat slower speed of. Presented here is a robust system for switching onoff, varying the speed and direction of rotation of an industrial 3 phase induction motor using vfd and plc. How to control the speed of 3 phase induction motor quora. The induction motor drives a variable load, is fed by an inverter and the plc controls the inverter. Presented here is a robust system for switching onoff, varying the speed and direction of rotation of. The single phase bridge rectifier is connected with the isolation. Plc and scada based fault diagnosis of induction motor. 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. Control action of a plc in our application, it controls through analog and digital. Pdf design of a plcbased variable load, speed control system. Speed of a 3 phase induction motor can be controlled by these methods.
Plc software must therefore be maintainable and extensible. Various automation processes in the industry need control of ac induction motors using ac drives. The application serves as an example of ac induction vector control drive design using a. The speed of an induction motor can be easily controlled by varying the frequency of the 3phase supply. Speed control of induction motor using pi and pid controller. Vf speed control of three phase induction motor by using plc. In addition, electronics can reduce the systems average power consumption and noise generation of the motor. Model is developed for spwm inverter fed induction motor using xilinx. Pdf design and plc implementation for speed control of. Vf speed control of three phase induction motor by using.
Although it is difficult to control voltage and frequencies at these high powers, the use. An843 ds00843apage 2 2002 microchip technology inc. Therefore in order to control the speed of a standard ac motor, the applied frequency and voltage must be controlled. Speed control of induction motor 7 ways to control induction. Motor speed control using vfd and plc programming ladder. Pdf induction motor speed control using plc and scada. Speed of a dc shunt motor can be varied very easily with good. Plc as system controller fuzzy method for speed control of a dc. Monitoring and control of a plc based vfd fed three phase. In this study, the plc measures the current, the voltage, the temperature, and the speed of an induction motor through analog inputs. The speed control of induction motor is done at the price of reduce in efficiency and low power.
Our control system will be held using the available siemens plc. Speed control of 3phase induction motor using pic18 microcontrollers. Speed control of vector controlled induction motors using. Sensorless vector control of induction motor drives is now receiving wide attention. The main reason is that the speed sensor spoils the. Speed control of a three phase induction motor using pwm. Speed control of three phase induction motor using plc under. The ip controller is considered the major contribution in this paper. Pdf design and implementation of plcbased monitoring control. It also illustrates the usage of dedicated motor control libraries that are included in the sdk. Fault diagnosis of induction motor using plc open access. Speed control of three phase induction motor using plc. This is plc program to control motor speed using vfd drive. The induction motor drives a variable load, is fed by an inverter, and the plc.
Induction motor speed control using fuzzy logic controller. Adding an external resistant into rotor side circuit. In most of the industrial application vfd variable frequency drives is used to control the. A three phase induction motor is basically a constant speed motor so its somewhat difficult to control its speed. Industries make use of plcs to control bulk electronic devices and it is found that combining them with motor drives such as vfds, the efficiency of induction. Speed control of dc motor by programmable logic control with. Journal of engineering research and application issn. The response of the controller to load variations is looked at. A closedloop control system for constant speed operation, configured with speed feedback. The speed control of induction motor by considering to control on rotor side can subdivide into several speed controlling methods such as. Open loop control of induction motor im is used in this inverter scheme. Design and implementation of plc based monitoring control. Speed control of induction motor using plc and scada. Abstract this paper presents a design and implementation of a.
This necessitates a speed control mechanism that is efficient and is also safe to use. How will the inverter and any control equipment contactors, plcs, relays. The basic structure of the plc is illustrated in fig. The variable speed drives which can control the speed of acdc motors are indispensable. Speed control of induction motor 7 ways to control. A three phase induction motor is mostly a constant speed motor so its fairly not easy to control its speed. We use here delta ac motor drive for its operation. Speed control of induction motor servo drives using terminal. 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. This motor runs at a speed less than its synchronous speed, therefore it is also. The induction motor can be isolated from the supply in case of any of the faults with relays.
Input and output components of the processes are connected to the plc. Record all nameplate information for the induction motor. The rotor speed of an induction motor is given by the equation shown below. The host computer provides the software environment to perform file editing.
Jan 09, 2017 speed control methods of induction motor. Implementation of plc in vfd controlled induction motor. Open the menu file from the menu bar and select new. An843, speed control of 3phase induction motor using pic18 mcus. From the figure above, the block diagram configurations can be obtained from this set up. The speed control of induction motor is done at the cost of decrease in. Programmable logic controllers plc and programmable automation controllers pac provide flexible multiple device or cloud connections which are safe and secure. Induction motors are widely used in industry because of their rigidity and speed control flexibility. Scalar control is the term used to describe a simpler form of motor control, using nonvectorcontrolled drive schemes.
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