In repulsion motor the torque develop is maximum when the position of brushes is at an angle of

In repulsion motor the torque develop is maximum when the position of brushes is at an angle of

Right Answer is:

45°

SOLUTION

For the production of torque in the rotor, we have to place the short-circuited brushes between 0° to 90° say α with respect to the magnetic axis. The torque in the repulsion motor is given as,

Armatur torque (Ta) = k sin (2α)

When α is 45° then maximum torque will be produced.

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