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The light-load adjustment produces its small extra torque by

  • A.a spring that assists the disc until a certain speed has been reached
  • B.a shading loop that makes the shunt magnet flux slightly asymmetrical
  • C.a weak permanent magnet placed close to the centre of the aluminium disc
  • D.reducing the number of turns on the series magnet at low currents

Answer: B

A copper loop or vane placed asymmetrically under the shunt magnet pole splits its flux into two components slightly out of phase, and those two produce a small torque proportional to the square of the voltage. That torque is present whatever the load and offsets the friction.

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