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Induction Motor Interview Questions with Answers | Part-1

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Electric Drives

What is the function of Electric Drives? And all the information of Electric drive is given below



Definition

  • A device which is used to motion control is called drive.
  • An electrical machine which used for motion control is called electric drive.
  • Block Diagram of Electrical Drives

 1. Source

  • Source are used in electrical drives 
  • AC supply
  • DC supply 

 2. Power modulator

  • Power modulator perform two functions
  • It take the electrical supply from the source and give it to the motor in suitable form of motor.
  • Power modulator select the mode of operation of motor, such that motoring or braking mode.

3. Load


  • It is the machinery or device which used to perform particular or given operation.

4. Motors


  • There are several motors are used in electrical drives such that DC series motor, DC Shunt motor, DC compound motor, DC permanent magnet motor, Induction motors, Synchronous motors, stepper motor.

 5. Sensing unit

  • Sensing unit sense the drive parameters like as speed of motor, current of motor etc.
  • Sensing unit is used to protection for motor. Then, these information is fed to the control unit.

 6. Control unit

  • It controls the power modulator using generating commands according to motor safety and power modulator safety.
  • It operate at lower voltage and lower power levels.

Advantages of electric drive


  • Electric drive is more flexible. It can be install where space is available and also we can change the place.
  • Electric drive is clean as compared to steam or diesel engine drives.
  • Electric drive needs less  space because it arranged nearer to the driven machine.
  • We can control the electric drive by remote control.
  • We can easily start the motor with starter only by pressing the button. It is easy to start as compared to steam or diesel engine drives.
  • Automatic control is possible in electric drive by using electronic control.

Disadvantages of electric drive


  • This system is possible only in electrified area.
  • If any fault occurs in supply whole system comes to stand still.
 



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