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Universal motor/sanjeet-1308143

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Universal motor/sanjeet-1308143

  1. 1. Universal motor Presented by: Sanjeet kumar Registration No.-1308143 Branch: Electrical & Electronics Engineering
  2. 2. UNIVERSAL MOTOR • Motor that can be used with a single- phase ac source as well as a dc source of supply voltages are called universal motor. • The stator and rotor windings of the motor are connected in series through the rotor commutator. • The universal motor is also known as an AC series motor or an AC commutator motor.
  3. 3. MOTORS 3 Universal Motor
  4. 4. Universal Motor • Series-connected – Rotor and Stator are connected in series • Operates on either ac or dc MOTORS 4
  5. 5. Equivalent Circuit ECE 441 5
  6. 6. A Closer Look ECE 441 6 Armature (Rotor) Field Winding Field (Stator)
  7. 7. ECE 441 7 The Commutator Bar and Brushes are a switch that reverses the current in the armature coil as it rotates
  8. 8. Check the Direction of Rotation ECE 441 8 Force on conductor B is upwards, rotation is counter- clockwise (CCW) Flux “Bunching” +Positive Half- Cycle+
  9. 9. Opposite Half-Cycle ECE 441 9 Force on Conductor B is upwards, rotation is counter- clockwise (CCW) Flux “Bunching” -Negative Half-Cycle-
  10. 10. Other Considerations • How do you reverse the direction of rotation? – Reverse the direction of the current in either the field or in the armature, but not both! • How do you control the speed of the motor? – Reduce the voltage applied to the motor • Use an autotransformer or SCR/Triac • This reduces the armature current, reducing the torque, reducing the speed • Applications – Portable power tools – Small appliances ECE 441 10
  11. 11. Presented By: Sanjeet Kumar +91-8968143473