Abstract
Linear vibration motors are becoming more popular for use in haptic applications owing to their better performance. However, a permanent magnet with a large volume causes massive magnetic flux leakage, which can be harmful to passengers with a cardiac pacemaker or an implantable-cardioverter defibrillator. The magnetic flux leakage is calculated using the 3D finite element method, which can also be applied to obtain the force factor. Then, the displacement and impedance are obtained to check the performance of the linear vibration motor by utilizing the finite element method. A prototype of a linear vibration motor is analyzed and verified based on the experimental results. Based on the analysis methods, three new designs are proposed to reduce the magnetic flux leakage to within 50 G. The final design shows a 93.07% reduction of the magnetic flux leakage while maintaining the same performance as the prototype. To verify the validity of the analysis results, three experimental results were obtained: the magnetic flux leakage, displacement, and impedance. The experimental results are in good agreement with the analysis results.
Highlights
With the recent widespread use of haptic devices [1], better haptic performance and more efficient linear vibration motors are in high demand, in smartphones, vehicle infotainment displays, and video game controllers
A horizontal linear vibrating actuator was designed to reduce the thickness of a smartphone, which represents an improvement in haptic performance compared to a vertical linear vibration actuator [3]
After applying the voltage to the linear vibration motor, the displacement could be detected by a laser, which depended on the frequency
Summary
With the recent widespread use of haptic devices [1], better haptic performance and more efficient linear vibration motors are in high demand, in smartphones, vehicle infotainment displays, and video game controllers. A resonant piezoelectric vibrator was designed by using a resonant amplification mechanism to have a high output displacement at a low frequency for haptic device applications [5] Most of these related studies have focused more on improving motor. The maximum displacement of a linear vibration motor is around 0.4 mm, and the range of resonance frequency is from 138 Hz to 150 Hz, while the working frequency is from 50 Hz to 500 Hz, and the electrical resistance is around 8 ohms These requirements are enough for haptic feedback to users. To reduce the magnetic flux leakage as much as possible, the second design was developed by reversing the prototype with a lower magnet grade and a thicker top plate, limiting the reduction on the force factor to less than 5%.
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