Can you control the speed of an induction motor?
In this method, speed of an induction motor is controlled by injecting a voltage in rotor circuit. If we inject emf which is in phase with the rotor induced emf, rotor resistance will decrease. Thus, by changing the phase of injected emf, speed can be controlled.
Which motor is best for speed control?
Brushless DC motors are an advanced option due to their wide speed range, low heat and maintenance-free operation. Stepper Motors offer high torque and smooth low speed operation. Speed is typically controlled by manual operation on the driver or by an external switch, or with an external 0~10 VDC.
How can the speed of a linear induction motor be controlled?
For accurate control of speed or position, the speed of the shaft can be monitored by a tachometer or position sensor and compared with a signal representing the desired value. The difference is then used to control the inverter frequency.
How is motor speed controlled?
Thus, the speed of a DC motor can control in three ways: By varying the flux, and by varying the current through field winding. By varying the armature voltage, and the armature resistance. Through the supply voltage.
What is the need of speed control of an induction motor?
Induction motors do not run at synchronous speed, they are generally fixed speed motors. In Industries mechanical loads should not only be driven but should also be driven at desired speed. Therefore, the need of speed control methods for induction motor arises.
What methods are employed for speed control of induction motor?
Thus, speed control of induction motor can be achieved by a total of five different methods:
- VVVF Speed Control.
- Pole Changing Method.
- Rotor Circuit Resistance Control.
- Stator Voltage Control.
- Emf Injection in Rotor Circuit.
What is speed control of induction motor?
By Injecting EMF In Rotor Circuit Speed control of induction motor is done in this method by injecting a particular voltage in the rotor diagram. The injected voltage (emf) needs to have an equal frequency with the slip frequency. However, there is no limitation for the phase of that emf.
Why is speed control of induction motor necessary?
Which method of speed control of 3 phase induction motor above and below normal speed can be obtained?
V/ f method
Hence its name is V/ f method. For controlling the speed of three phase induction motor by V/f method we have to supply variable voltage and frequency which is easily obtained by using converter and inverter set.
When the induction motor runs faster than the synchronous speed the induction motor runs as?
When induction motor runs faster than synchronous speed, induction motor runs as induction generator.
Which method of speed control of induction motor is complicated?
Vector control
For the Induction Motor (IM) the technique is used as Volts/Hertz constant. Vector control is more complex technique than scalar control, the evolution of which was inexorable, since scalar control technique cannot be applied for controlling systems with dynamic behavior.
How is fuzzy logic used in induction motor?
This paper describes the use of fuzzy logic techniques to control the speed of a three-phase induction motor. The use of Matlab/Simulink and fuzzyTECH MCU96 as software development tools for system design is emphasised.
How is speed control of an induction motor done?
Speed control of induction motor takes place by, Direct torque control (DTC) method i.e. by directly controlling torque. Here we have used Voltage/Frequency speed control method of induction motor. The fuzzy logic controller (FLC) solves the problem of non linearity’s and parameter variation of induction motor.
How does a fuzzy logic slip controller work?
The speed error (the difference between reference speed and motor speed) is then computed and used as input to the slip controller (fuzzy logic or PI controller). The controller sets the motor slip frequency which allows the amplitude and frequency voltage to be computed according to the block diagram in Fig.1.
What kind of hardware is used for fuzzy logic?
The use of Matlab/Simulink and fuzzyTECH MCU96 as software development tools for system design is emphasised. Hardware implementation is based on a standard 16/32-bit microcontroller, without the need of any additional components for the fuzzy logic controller. The system performance is evaluated in comparison with a traditional PI control scheme.