Analysis and optimization of the excitation coils in the miniature linear compressor

doi:10.7523/j.ucas.2024.043

Abstract

Abstract:

Vapor compression refrigeration can operate electronic devices at lower temperatures even under harsh conditions， but it faces critical challenges in miniaturization and oil-free operation. This paper presents a detailed analysis and optimization of the excitation coils of the linear compressor using finite element analysis. The optimization allows the coil to be more compactly integrated with the outer stator core， further reducing the compressor's volume. A bobbinless coil was developed to increase the slot fill factor， resulting in a more compact structure. Simulation comparisons demonstrate effective enhancements in motor output capacity and efficiency. A prototype was constructed， featuring a linear motor with an outer diameter of 61 mm and a length of 36 mm. The measured electromagnetic force coefficient is 20.73 N·A^-1， which is very close to the simulation result of 21.34 N·A^-1. Voltage regulation experiments were also conducted under oil-free conditions， confirming that the device can maintain its performance while achieving miniaturization and oil-free operation.

Key words: linear compressor, linear motor, finite element analysis, electronic device cooling

CLC Number:

TB652

Xuan YANG, Haojie ZHOU, Ji LI. Analysis and optimization of the excitation coils in the miniature linear compressor[J]. Journal of University of Chinese Academy of Sciences, 2026, 43(3): 306-315.

Figures/Tables 10

Fig.1 Structural diagram of the linear motor

Fig.2 Finite element analysis model

Fig.3 Influence of slot area-related parameters on motor performance

Fig.4 Influence of slot fill factor and wire diameter on motor performance

Table 1 Optimized dimensional parameters of the coil

参数	数值
齿长/mm	13
齿后长度/mm	3
齿根宽度/mm	5
齿尖宽度/mm	1
漆包线裸径/mm	0.60
漆包线线径/mm	0.64
槽满率/%	65
匝数	319
线圈电阻/Ω	3.01

Fig.5 Operating status of the motor under rated conditions

Fig.6 Comparison of motor performance under two schemes： with and without a bobbin

Fig.7 Schematic diagram of the experimental system

Fig.8 Motor performance test results

Table 2 Parameters of miniature linear compressors

型号	压缩机尺寸（外径/mm $×$ 长度/mm）	质量/kg	电磁力系数/(N·A^-1)
邓伟峰^[22]	110 $×$ 250	8.0	13.9
洪昊等^[23]	62 $×$ 118	1.2	9.6^#
蒋珍华等^[24]	NA	4.5	15.7^#
陆国华等^[25]	60 $×$ 166	2.2	13.0^#
本文	63 $×$ 105	0.8	20.7

Table 2 Parameters of miniature linear compressors

型号	压缩机尺寸（外径/mm $×$ 长度/mm）	质量/kg	电磁力系数/(N·A^-1)
邓伟峰^[22]	110 $×$ 250	8.0	13.9
洪昊等^[23]	62 $×$ 118	1.2	9.6^#
蒋珍华等^[24]	NA	4.5	15.7^#
陆国华等^[25]	60 $×$ 166	2.2	13.0^#
本文	63 $×$ 105	0.8	20.7

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