The Magnetostatic Simulation and Determination of Magnetic Components for an External Ventricular Drainage Device

Wang, Jiahui; Ye, Junjun; Yan, Rongguo

doi:10.23919/ccc52363.2021.9549326

Cited by 2 publications

(2 citation statements)

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“…Instead, BLDCMs use electrical methods to detect the rotor position and control its speed. Therefore, magnetic components (Hall sensors) or optical encoders [10] must be integrated into the motor's axis to provide feedback on the rotor's position to the controller. This allows the controller to determine the current position of the motor rotor, serving as the basis for commutation control.…”

Section: Bldcm Systemmentioning

confidence: 99%

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A Robust Controller Based on Extension Sliding Mode Theory for BLDC Motor Drives

Chao,

Hsieh,

Chen

2024

Preprint

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This paper presents the design of a robust speed controller for brushless DC motors (BLDCM) under field-oriented control (FOC). The proposed robust controller integrates extension theory (ET) and sliding mode theory (SMT) to achieve robustness. First, the speed difference between the speed command and the actual speed of the BLDCM, along with the rate of change of the speed difference, are divided into 20 interval categories. Then, the feedback speed difference and the rate of change of the speed difference are calculated for their extension correlation with each of the 20 interval categories. The interval category with the highest correlation is used to determine the appropriate control gain for the sliding mode speed controller. This gain adjustment tunes the parameters of the sliding surface in the SMT, thereby suppressing the overshoot of the motor speed. Because the sliding surface reaching law of the sliding mode controller (SMC) adopts the exponential approach law, the system's speed response can quickly follow the speed command in any state and exhibit excellent load regulation response. The simplicity of this robust control method, which requires minimal training data, facilitates easy implementation. Finally, the speed control of the BLDCM is simulated using Matlab/Simulink software, and the results are compared with those of the SMC using the constant speed approach law. The simulation results demonstrate that the proposed robust controller exhibits superior speed command tracking and load regulation response compared to the traditional SMC.

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Section: Bldcm Systemmentioning

confidence: 99%

“…The flux is the projection of a constant flux vector f  along the ,, abcaxis direction. The magnetic flux equation in the three-phase stationary coordinate system is represented as Equation (10).…”

Section: Dynamic Equations Of the Foc System For Bldcmsmentioning

confidence: 99%