Title:   Variable frequency drive of induction motor with Regenerative breaking


   A variable frequency drive (VFD) also termed adjustable-frequency drive or variable-speed drive is a type of adjustable speed drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and voltage. Variable frequency drives are used in applications ranging from small appliances to the largest of mine mill drives and compressors. And around 25% of the world's electrical energy is consumed by electric motors in industrial applications and VFD’s installation for induction motors is increasing day by day. The VFD controller is a solid state power electronics conversion system consisting of three distinct sub-systems:

  • a rectifier bridge converter,
  • a direct current (DC) link,
  • an inverter

  •     By controlling the voltage and frequency of the pulses (V/F Method) we can control the speed of the motor by keeping the torque constant.
        A regenerative brake is an energy recovery mechanism which slows a vehicle or object down by converting its energy into another form, which can be either used immediately or stored until needed. Vehicles driven by electric motors uses this mechanism during braking mode to store the braking energy back to batteries.
        It is operated as a generator during braking and its output is supplied to an electrical load, the transfer of energy to the load provides the braking effect.

    Advisor:  Dr. Tahir Izhar   

    Group Members:

    Name: M. Omer Ajmal
    Phone: 03314345441

    Name: M. Usman Ghalib
    Phone: 03364416601

    Name: Zeeshan Israr
    Phone: 03224232719

    Name: Hassan bilal
    Phone: 032448810464