Design and Analysis of In-Drum Outer Rotor BLDC Motor for Eddy Current Separator

Abstract

In this study, a novel In-Drum Brushless Direct Current (ID-BLDC) motor is proposed to Eddy Current Separator (ECS) which separates nonferrous metals from waste. The ECS's separation efficiency depends on magnetic drum speed. ID-BLDC motor is designed with outer rotor structure and placed in ECS magnetic drum in order to improve separation efficiency. The magnetic drum is directly driven by this motor because it doesn't require coupling mechanisms. It has very simple structure since no rotor windings, brushes and bracelets. The ID-BLDC motor has high reliability, high efficiency and high power-to-volume ratio. Proposed motor has 8 poles, 3 phases, 373 W (0.5 HP) and 1750 rpm rated speed. Output parameters are calculated for full load and verified by Finite Element Analysis (FEA) under the over load, full load, half load, quarter load and no load conditions for transient and steady state.

In this study, a novel In-Drum Brushless Direct Current (ID-BLDC) motor is proposed to Eddy Current Separator (ECS) which separates nonferrous metals from waste. The ECS's separation efficiency depends on magnetic drum speed. ID-BLDC motor is designed with outer rotor structure and placed in ECS magnetic drum in order to improve separation efficiency. The magnetic drum is directly driven by this motor because it doesn't require coupling mechanisms. It has very simple structure since no rotor windings, brushes and bracelets. The ID-BLDC motor has high reliability, high efficiency and high power-to-volume ratio. Proposed motor has 8 poles, 3 phases, 373 W (0.5 HP) and 1750 rpm rated speed. Output parameters are calculated for full load and verified by Finite Element Analysis (FEA) under the over load, full load, half load, quarter load and no load conditions for transient and steady state.