Abstract
The scroll-type air motor, also named the scroll expander, has been widely used for different applications due to its characteristics of compact structure and high energy conversion efficiency. However, the leakage and the friction result in non-negligible energy losses. This paper presents the recent work on developing a new scroll-type air motor with mounted permanent magnetic spirals and investigates its potential in leakage reduction and efficiency improvement, especially at low-pressure air supply conditions. A method for the implementation of the magnetic scroll air motor is proposed. A prototype is manufactured, and initial experimental tests are conducted to study the generalized torque distribution. A mathematical model for the magnetic scroll air motor is developed, and a corresponding simulation study is presented. The study shows that the proposed magnetic scroll air motor structure is feasible in terms of manufacturing and has the potential to reduce the air leakage and, thus, to improve the energy efficiency by a maximum of around 15% at a supply pressure of $2 \times {10^5}$ Pa, with a flank leakage clearance reference of 0.06 mm.
Highlights
Pneumatic motors convert compressed air energy into driving force for linear and angular motions and its applications can be found in industrial and residential areas
The paper will focus on one particular type — the scroll-type air motor, and it will propose a new design for improving its performance and energy efficiency
The test data from the prototype indicates the combined effect of the magnetic torque generated from the magnetic field and the torque resulting from the maximum mechanical static friction, while the measurement data from the ordinary scroll air motor shows the effect from the maximum mechanical static friction only
Summary
This paper presents the recent work on developing a new scroll-type air motor with mounted permanent magnetic spirals and investigates its potential in leakage reduction and efficiency improvement, especially at low-pressure air supply conditions. A method for the implementation of the magnetic scroll air motor is proposed. A mathematical model for the magnetic scroll air motor is developed and a corresponding simulation study is presented. The study shows that the proposed magnetic scroll air motor structure is feasible in terms of manufacturing and has the potential to reduce the air leakage and to improve the energy efficiency by a maximum of around 15% at a supply pressure of 2 105 Pa with a flank leakage clearance reference of 0.06mm. Index Terms — Scroll-type Air Motor, Prime Mover of Generator, Magnetic, Mathematical Modelling and Energy Efficiency
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