In repulsion motor, maximum torque is developed when____________?
Correct answer: A. brush axis is at 45° electrical to the field axis
- A. brush axis is at 45° electrical to the field axis
- B. brush axis coincides with the field axis
- C. brush axis is at 90° electrical to the field axis
- D. none of the above
Explanation
Repulsion-motor torque is proportional to the interaction of the relevant fluxes and is maximum when the brush axis is approximately 45 electrical degrees from the field axis. At coincidence or 90 degrees, the torque is not maximum.
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