Effect of winding and power supply parameters on the starting characteristics of an upgraded brushless DC motor

Objectives. This work is aimed at determining the optimum number of turns in each winding and the effect of winding and power supply parameters on the starting characteristics of an upgraded brushless direct current motor (BLDC motor).

Methods. A full-scale experiment on a test bench consisting of an upgraded BLDC motor, a power supply source, and a speed controller was conducted. Methods of mathematical simulation, linear programming, and approximation were also applied.

Results. During the experiments, the dependencies of inrush current and starting speed on the number of turns in each winding of the upgraded BLDC motor were obtained. It was experimentally established that the number of turns in the windings has a limiting value, which is confirmed by either the intersection of the curves of inrush current and starting speed, orthe disappearance of the functional dependence between the inrush current and motor speed. A mathematical model for the upgraded BLDC motor was developed, which showed good agreement with the experimental results. Using this mathematical model, the optimum number of turns in each of the motor windings and the efficiency of a BLDC motor can be determined. A parametric model for determining the motor starting speed by the values of inrush current and battery voltage at the number of turns in the winding from 8 to 14 was proposed. The developed models make it possible to determine the motor characteristics at the design stage.

Conclusions. There exists an interval of the number of turns in each of the windings of a BLDC motor, where the motor demonstrates its optimum efficiency. Inrush current and supply voltage were found to be the parameters that are easily measurable in practice and sufficient for determining the basic starting characteristics of a BLDC motor.

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