Title :
An approach to improvement of HDD spindle motor efficiency
Author :
Qu, Liang ; Feng, Ming
Author_Institution :
Sch. of Mech. Eng., Univ. of Sci. & Technol. Beijing, Beijing, China
Abstract :
To improve the efficiency of HDD spindle motor, reducing air gap length (AGL) and raising magnetic energy product (MEP) of magnetic material are considered to be efficient methods. However some disadvantages are introduced concomitantly, such as the increase of cogging torque (CT) and unbalanced magnetic pull (UMP). This paper investigates both positive and negative effects of reduction of AGL and improvement of MEP on motor characteristics and proposes methods to decrease or avoid the negative effects. Then, an optimal design which can achieve a trade-off between high efficiency and increase of CT and UMP is proposed.
Keywords :
air gaps; disc drives; electric motors; hard discs; magnetic materials; torque; HDD spindle motor efficiency; air gap length; cogging torque; magnetic energy product; magnetic material; optimal design; unbalanced magnetic pull; Brushless DC motors; Hysteresis motors; Magnetic flux; Saturation magnetization; Torque; cogging torque; high efficiency; spindle motor; unbalance magnetic pull;
Conference_Titel :
Electrical Machines and Systems (ICEMS), 2011 International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4577-1044-5
DOI :
10.1109/ICEMS.2011.6073469
