Non-Contacting DC Current Motor with Coil Switching by Two Transistors

The purpose of this article was to study the noncontacting DC motor. Within the research we found the distribution of the resultant magnetic induction along the circumference of the air gap. Moreover, we determined optimal relationships between the parameters of inductors. Findings of the research show that in the instantaneous non-contacting DC motor with two inductors, the specific moment is approximately 1,2 times smaller than in the engine with unevenly installed inductor poles, and the pulsation of the electromagnetic moment for any engine shaft rotation speed is much smaller. We considered the features of electromagnetic processes in a low-power non-contacting DC motor and obtained an expression for the electromagnetic moment. As a result, we found out that the torque pulsation depends on the ratio e, the EMF of rotation to the supply voltage. In particular, for the instantaneous engine under consideration (e = 0), pulsation is 20 %, and for the known engine - 33%, i.e., 1,7 times greater; the observed high-speed non-contacting DC motor at e = 0,5, has the torque pulsation which is approximately 2%, i.e., very insignificant.

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