Induction Relay Torque Equation:

In Induction Relay Torque Equation, Two magnetic fluxes Φ1 and Φ2 differing in time phase penetrate through a disc. These alternating fluxes induce emfs e1 and e2 in the disc which lag their respective fluxes by 90°. These emfs lead to the flow of eddy currents i1 and i2. By the interaction of Φ1 with i2 and Φ2 with i1 a driving torque is produced.

The currents i1 and i2 lag the voltages e1 and e2 by the impedance angle λ of the disc. Figure (3.6) shows the vector diagram.

Induction Relay Torque Equation

Let

Therefore, the resultant torque is given by.

Induction Relay Torque Equation

Thus the induction relay is a sine comparator in which the maximum torque is developed when α is 90° or 270° and zero torque when α is 0° or 180°.

Related posts:

  1. Universal Relay Torque Equation Derivation
  2. Torque Equation of Synchronous Motor
  3. EMF and Torque Equation of DC Machine
  4. Torque Equation of DC Motor
  5. Torque Equation of Motor Load System
  6. General Equation for Electromagnetic Relay
  7. Torque Slip Characteristics of Induction Motor
  8. Torque Speed Characteristics of Induction Motor
  9. Induction Type Overcurrent Relay
  10. Induction Type Directional Power Relay
  11. Induction Type Directional Overcurrent Relay
  12. Electromagnetic Induction Relay – Structure and Working Principle
  13. Induction Type Negative Phase Sequence Relay
  14. Torque in Round Rotor Synchronous Machine
  15. Speed Torque Characteristics of DC Series Motor
  16. Speed Torque Characteristic of Separately Excited DC Motor
  17. Speed Torque Characteristic of DC Shunt Motor
  18. Speed Torque Characteristics of Series Motor
  19. Control of AC Motors Torque Control
  20. Closed Loop Torque Control of Drives