BLDC Motor Modelling and Control - A Matlab%/Simulink Implementation

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有关无刷电机的Simulink仿真的一篇论文，此论文来自瑞典一所大学的研究生论文，关于无刷电机的仿真。
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BLDC Motor Modelling and Control - A Matlab%/Simulink Implementation

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) A. _2 ~- e8 O( ~- RAbstract
This thesis presents a model of a three phase star-connected brushless direct current (bldc) motor. The construction and operation of both conventional dc motors
3 j2 ?4 L9 u# W+ Tand bldc motors is presented and state-space models are derived for each. Matlab@ /Simulink@ models are developed for each motor type and their validity is verified. Torque-, speed- and position control is applied using hysteresis band control, pwm control, and variable dc- link voltage control.
The different control strategies are tested on the bldc motor and their peRFor-mance evaluated. The frequency content of the dc link current is investigated for each control method and the impact of commutation delay and switch-ing losses is discussed. Simulations show that all the control strategies work quite well although each method has its drawbacks. The frequency spectrum of the dc-link current shows that hysteresis band control may not be suitable where load variations are large. The variable dc-link voltage method turns out to be the best solution in applications where torque ripples and switching losses must me minimized. Commutation delay is necessary in practice, but
+ ]+ s3 o5 j7 `! |9 \the simulations show that it should be kept as short as possible because it causes increased torque ripples.
Keywords: Brushless motors, bldc, modelling, control.

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