Number of poles

The number of poles is inversely proportional to the speed of rotation of the motor and to an electric motor of the same polarity, the greater the rotation of the motor, the greater the frequency of its power supply 1 1/2 hp motors. This causes greater losses in stator iron and inverter switching. However, to achieve smooth torque at low rotations, it is advisable to use higher polarities. When we double the number of poles, the thickness of the rotor crown is halved, as is the crown of the stator. With the increase in the number of poles, the number of turns of the stator is reduced in the same way as the inductance and the synchronous reactance. For the configuration of buried magnets, there will be a tendency for the circular flow inside the rotor through the magnets, thus not generating torque. In order to have the solution of this, it is necessary that the height of the magnets, or the number of poles is increased. As there is a need to group the magnet flux in the air gap of the rotor, if the number of poles is reduced, this objective is not achieved.

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