Design and analysis of linear oscillating motor for linear pump application-magnetic field, dynamics and thermotics

doi:10.1007/s11465-016-0407-9

Front. Mech. Eng.

2016, Vol. 11

Issue (4) : 351-362 https://doi.org/10.1007/s11465-016-0407-9

RESEARCH ARTICLE

Design and analysis of linear oscillating motor for linear pump application-magnetic field, dynamics and thermotics

Zongxia JIAO¹,Tianyi WANG¹,Liang YAN²(

)

¹. School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China
². School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China; Shenzhen Research Institute of Beihang University, Shenzhen 518057, China

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Abstract

A linear oscillating motor is an electromagnetic actuator that can achieve short-stroke reciprocating movement directly without auxiliary transmission mechanisms. It has been widely used in linear pump applications as the source of power and motion. However, because of the demand of high power density in a linear actuation system, the performance of linear oscillating motors has been the focus of studies and deserves further research for high power density. In this paper, a general framework of linear oscillating motor design and optimization is addressed in detail, including the electromagnetic, dynamics, and thermal aspects. First, the electromagnetic and dynamics characteristics are modeled to reveal the principle for optimization. Then, optimization and analysis on magnetic structure, resonant system, and thermal features are conducted, which provide the foundation for prototype development. Finally, experimental results are provided for validation. As a whole, this process offers complete guidance for high power density linear oscillating motors in linear pump applications.

Keywords linear oscillating motor linear pump magnetic field motor optimization

Corresponding Author(s): Liang YAN

Just Accepted Date: 03 November 2016 Online First Date: 21 November 2016 Issue Date: 29 November 2016

Cite this article:

Zongxia JIAO,Tianyi WANG,Liang YAN. Design and analysis of linear oscillating motor for linear pump application-magnetic field, dynamics and thermotics[J]. Front. Mech. Eng., 2016, 11(4): 351-362.

URL:

https://academic.hep.com.cn/fme/EN/10.1007/s11465-016-0407-9
https://academic.hep.com.cn/fme/EN/Y2016/V11/I4/351

Fig.1 Schematic structure of quasi-Halbach array

Fig.2 Detailed structure of stator: (a) Semi-closed slot; (b) circumferential laminations

Fig.3 Mechanical structure of linear oscillating motor (cross-section view)

Fig.4 Schematic of dual-loop feedback control architecture

Fig.5 Optimization of split ratio

Fig.6 Influence of back-iron thickness on thrust

Fig.7 Influence of magnet thickness on thrust

Fig.8 Influence of radial magnet length ratio on thrust stability

Fig.9 Influence of coil width on peak force and force stability

Fig.10 Influence of yoke thickness on thrust

Fig.11 Influence of teeth angle on thrust

Fig.12 Analysis of slot width effect on cogging force and current generated force. (a) Cogging force; (b) current generated force

Tab.1 Detailed electromagnetic structure of motor

Fig.13 Efficiency around resonance for different spring stiffness

Fig.14 Efficiency along frequency for different load values

Fig.15 Efficiency vs. load for different resonant frequencies

Fig.16 Steady-state temperature distribution for different current inputs. (a) 5 A/mm 2 steady-state stall testing; (b) 7.5 A/mm 2 steady-state stall with cooling fan

Fig.17 Steady-state temperature distribution for different current inputs. (a) 5 A/mm 2 current density with naturally cooling; (b) 7.5 A/mm 2 current density with cooling fan

Fig.18 Prototype and test platform. (a) Structure and components of motor; (b) test platform

Tab.2 Prototype parameters

Fig.19 Static output of thrust. (a) Force constant within stroke; (b) thrust vs. current input

Fig.20 Inductance within stroke

Fig.21 Load characteristic curve of motor

Fig.22 Efficiency experiments. (a) Efficiency vs. load; (b) efficiency along frequency

Fig.23 Dynamic position adjustment tracking. (a) 0 N load; (b) 200 N load

Fig.24 Dynamic response of motor. (a) Current-loop dynamic response on different frequencies; (b) position-loop dynamic response on different frequencies

Fig.25 Simplified flight load on motor and loading strategy. (a) Simplified flight load; (b) loading strategy for motor

Fig.26 Transient temperature of magnet and coil for two types of loading condition. (a) Load condition I; (b) load condition II

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