Abstract
The paper presents a method of computing electrical and mechanical
variables of BLDC motors. It takes into account electrical, magnetic and
mechanical phenomena in the power supply-converter-BLDC motor-load machine
system. The solution to the problem is the so-called circuit-field method.
The results determined with the use of time stepping finite element method
were used as the parameters of equations of the developed mathematical
model. Losses in the motor, losses in transistors and diodes of the
converter as well as the actual back EMF waveforms, variable moment of
inertia and variable load torque are accounted for. The designed
laboratory stand and the test results are presented in the paper. The
experimental verification shows the correctness of the developed method,
algorithm and program. The developed computational method is universal
with respect to different electromechanical systems with cylindrical BLDC
motors. It can be applied to electromechanical systems with BLDC motors
operating at constant but also variable load torque and moment of inertia.
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