ANN-based method for parametric modelling and optimising efficiency, output power and material cost of BLDC motor

• Published in: IET electric power applications Vol. 14; no. 6; pp. 951 - 960
• Main Authors: Sadrossadat, Sayed Alireza, Rahmani, Omid
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 01.06.2020
• Subjects: analytical models; ANN‐based BLDC motor model; artificial neural network; brushless DC motors; conventional optimisation methods; efficiency maximisation; electric machine analysis computing; LP function; material cost minimisation; minimum material cost goal; neural nets; nonlinear magnetic constraints; objective function; optimisation; parametric modelling; permanent magnet motors; permanent‐magnet brushless DC motor; Research Article; speed maximisation; speed maximisation; LP function; artificial neural network; parametric modelling; conventional optimisation methods; analytical models; minimum material cost goal; nonlinear magnetic constraints; material cost minimisation; permanent-magnet brushless DC motor; optimisation; efficiency maximisation; ANN-based BLDC motor model; permanent magnet motors; neural nets; electric machine analysis computing; brushless DC motors; objective function
• ISSN: 1751-8660; 1751-8679; 1751-8679
• DOI: 10.1049/iet-epa.2019.0686

This study presents a new method for parametric modelling and optimisation of a permanent-magnet brushless DC (BLDC) motor. We proposed an artificial neural network (ANN)-based $L_{\rm P}$LP metric technique to combine and optimise different objective functions of a BLDC motor using ANN-based models and compared with conventional optimisation methods with analytical models. To proceed with this optimisation problem, the $L_{\rm P}$LP function should be minimised. For applying constraints to this problem, a simple method called penalty factor is proposed, in which a penalty term was added to the $L_{\rm P}$LP function when the constraints are violated. We considered three goals in this optimisation: efficiency maximisation, speed maximisation and material cost minimisation. Since the load is constant torque in our case, more speed means more powerful motor, and to achieve the minimum material cost goal the volume of the magnet is set as an objective function. To find the optimum geometric parameters, we used gradient-based method subject to non-linear magnetic constraints. All the obtained results were validated by Ansoft Maxwell. Optimising using the proposed method including ANN-based models does not require knowledge about complicated electric/magnetic equations. Also, ANN-based BLDC motor model is more accurate than analytical models and faster than existing models in simulation tools.