Affiliations: School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu, China
Correspondence:
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Corresponding author: Yan Shi, School of Mechanical Engineering, Nanjing University of Science and Technology, 200 Xiaolingwei Street, Nanjing, Jiangsu 210094, China. Tel.: +86 25 8431 5425; Fax: +86 25 8431 5831; E-mail:shiyan@mail.njust.edu.cn
Abstract: This paper presents a novel direct-drive linear
compressor for air brake system in electric vehicles. By integrating the
free piston and mechanical springs into a moving-coil type electromagnetic
linear oscillating actuator (EMLOA), the structure of the proposed linear
compressor is increasing compact. Moreover, the novel features, such as high
thrust force constant, better controllability, and high resonant frequency,
enable the linear compressor to operate most efficiently at resonance. The
thrust force constant is enhanced by employing quasi-Halbach array and is
tested to be high (74 N/A) and unchanged over the whole stroke. Dynamic
modeling and experiment validation are performed to analyze dynamic
characteristics of the linear compressor. The experimental and simulated
data agree well, by regulating the frequency and amplitude of the excitation
current, the high efficiency of the EMLOA (91.7%) and the low energy
volume ratio of the linear compressor (7.3 kW/(m3/min)) indicate that
the proposed linear compressor is significant energy saving compared with
conventional compressors.
Keywords: Direct drive, linear compressor, linear oscillating actuator, linear motor, resonance
