Investigating Electromagnetic Processes in a Brushless Direct Current Motor with the Winding Commutated by Means of Тwo Transistors or Thyristors

The study deals with a brushless direct current motor with a two-section toroidal armature winding and two permanent magnets serving as cylindrical inductors. The number of radial poles in one inductor is twice as large as that in the other inductor. The electrical angle between sections constitutes 180°. The commutator comprises two power transistors or thyristors that alternatively connect sections of the armature winding inversely to the power source and disconnect them from it. Our investigation of the electromagnetic processes took into account the distribution of the magnetic induction resultant in the armature winding along the circumference of the air gap and the inductance of the armature winding sections. We derived equations for electromagnetic power and power consumption, as well as those for determining the electromotive force coefficient and commutation advancement angle corresponding to the maximum electromagnetic efficiency, which are necessary to design and develop brushless direct current motors

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