INDUCTION MOTOR DRIVE PROJECTS FOR Btech / Mtech STUDENTS


The AC Induction Motor (ACIM), sometimes called a squirrel cage motor, is one of the most popular motors used in consumer and industrial applications. Induction machines are by far the largest group of all industrial electrical machines, converting approximately 70-80% of all electrical energy into mechanical form. The have a very robust rotor construction, which makes them suitable for high-speed applications. With proper design, they have good overloading and field weakening characteristics.

  • The ACIM is comprised of a simple cage-like rotor and a stator containing three windings
  • The changing field produced by the AC line current in the stator induces a current in the rotor which interacts with the field and causes the rotor to rotate
  • The rotor does not have any moving contacts, which eliminates sparking


The AC induction motor (ACIM) is the most popular motor used in consumer and industrial applications, and represented the "muscle" behind the industrial revolution. The concept of this "sparkless" motor was first conceived by Nicola Tesla in the late nineteenth century as a polyphase structure consisting of two stator phases in an orthogonal relationship. It has since been modified to the more common three phase structure, which results in balanced operation of the motor voltages and currents.

The motor does not have a brush/commutator structure like a brush DC motor has, which eliminates all the problems associated with sparking; such as electrical noise, brush wear, high friction, and poor reliability. The absence of magnets in the rotor and stator structures further enhances reliability, and also makes it very economical to manufacture. In high horsepower applications (such as 500 HP and higher), the AC induction motor is one of the most efficient motors in existence, where efficiency ratings of 97% or higher are possible. However, under light load conditions, the quadrature magnetizing current required to produce the rotor flux represents a large portion of the stator current, which results in reduced efficiency and poor Power Factor operation.

ACIMs perform best when they are driven with sinusoidal voltages and currents. One of the advantages of ACIMs is the incredibly smooth operation they can provide as a result of low torque ripple. To achieve this, most ACIMs consist of a slotted stator structure where the windings are placed in the slots with a sinusoidal winding distribution, resulting in a sinusoidal flux distribution in the airgap. This flux also links the rotor circuit, which consists of copper or aluminum bars shorted at each end, and mounted on a stacked laminate structure comprised of soft iron, or other ferrous material. In most cases, motor efficiency can be increased by decreasing the rotor bar resistance. As the flux cuts across these conductors, a d-flux/dt voltage is impressed across the rotor bars, which results in current flow in the rotor. In other words, current is induced in the rotor circuit from the stator circuit; much the same way that secondary current is induced from the primary coil in a standard transformer. This rotor current produces its own flux, which interacts with the stator mmF to produce torque. However, in order to achieve this d-flux/dt effect on the rotor bars, the rotor cannot rotate at the same speed as the rotating stator field. As a result, induction motors are classified as asynchronous motors. The difference in rotational speed between the stator flux vector and the rotor is called slip. As more torque is required from the motor shaft, the slip frequency increases. In conclusion, the motor speed is a function of the number of stator poles, the motor torque (and consequently motor slip), and the frequency of the AC input voltage.

The three phase topology represents an ideal choice for variable-speed applications. Three phase inverters are commonly used as shown in the diagram, where motor speed can be controlled by simply varying the voltage and frequency of the applied waveform (open-loop V/Hz or scalar control). Alternately, speed can be controlled by wrapping a speed loop around a torque loop incorporating Field Oriented Control (FOC).

AC induction motors are also available in single-phase versions. Most single phase versions actually have two phases, where one phase is used to help get the motor started. Once the motor reaches a certain speed, this phase can be disconnected, resulting in the motor operating on just one phase.


MOTORS, DRIVES & CONTROL PROJECTS

  1. Fuzzy Logic based Speed Control of AC Motor using Microcontroller with Line Fault Identification
  2. Fuzzy based Speed Control of Induction Motor using Microcontroller
  3. Fuzzy Logic based Speed Control of DC Motor
  4. Speed Control of AC Motor with Multi Parameter Monitoring
  5. Speed Control of DC Motor with Field & Armature Control
  6. Cycloconverter Drive for AC Motors
  7. Digital PID Controller based Speed Control of DC Motor
  8. Speed Control of a Linear Induction Motor V/F Technique
  9. Noise Less Speed Control of DC Motor using PWM Converter
  10. Brushless Speed Control of DC Motor
  11. PWM based Bidirectional Speed Control of DC Motor
  12. Voltage Stresses On Stator Windings of Induction Motors Driven By IGBT PWM Inverters
  13. Sensor less Speed Control of AC Induction Motor using Microcontroller
  14. Speed Control of DC Motor using FQ / TQ Chopper Drive
  15. Cell Phone based Motor Speed Control
  16. Closed Loop Dc Motor Speed Controller
  17. Frequency Locked Loop Dc Motor Speed Control
  18. IGBT based Dc Motor Drive Control System
  19. Slip Ring induction Motor Drive with Slip Recovery using IGBT
  20. Efficiency Detector for Relay & Circuit Breaker
  21. Single Phase Multilevel Inverter SPWM with PC Interface and OLM
  22. Wireless DC Motor Speed Control using Triac
  23. Single Phase Input to DC Output – DC Motor Drive-Armature Voltage Control
  24. Single Phase Thyristorized Power Controller for Industrial Applications
  25. Microcontroller based Firing Circuit for Thyristor Converters

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