Abstract
In this paper, we propose and evaluate a robust design optimization (RDO) algorithm for the shape of a brushless DC (BLDC) motor used in an electric oil pump (EOP). The components of the EOP system and the control block diagram for driving the BLDC motor are described. Although the conventional deterministic design optimization (DDO) method derives an appropriate combination of design goals and target performance, DDO does not allow free searching of the entire design space because it is confined to preset experimental combinations of parameter levels. To solve this problem, we propose an efficient RDO method that improves the torque characteristics of BLDC motors by considering design variable uncertainties. The dimensions of the stator and the rotor were selected as the design variables for the optimal design and a penalty function was applied to address the disadvantages of the conventional Taguchi method. The optimal design results obtained through the proposed RDO algorithm were confirmed by finite element analysis, and the improvement in torque and output performance was confirmed through experimental dynamometer tests of a BLDC motor fabricated according to the optimization results.
Highlights
A hybrid vehicle combines two or more different power sources to obtain a driving force
We optimized the torque characteristics of a brushless DC (BLDC) motor used in an electric oil pump (EOP) system
This constraint was applied to the design method by adding a penalty function associated with the constraint to the loss function and adjusting the parameter level intervals by applying an optimal level search method
Summary
A hybrid vehicle combines two or more different power sources to obtain a driving force. Conventional oil pumps fail to deliver the required flow rate under operating conditions, thereby decreasing the vehicle’s fuel efficiency [8]. To address this problem, an electric oil pump (EOP) has been developed that can supply a suitable flow rate under operating conditions [9,10]. Hybrid vehicles with conventional internal combustion engines use a mechanical oil pump to improve fuel economy and an EOP as an auxiliary; the EOP operates only when the mechanical oil pump stops, when the vehicle stops or travels at low speed, or when the transmission fluid flow is insufficient in the electric-vehicle mode.
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