Design and performance tests of a new MR braking device for traction elevator

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (23) : 165-175.

CHEN Kaifeng1,2, ZHENG Xiangpan1,2

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Abstract

With rapid development of urbanization construction, elevators play more and more important role.The existing traction elevator braking device adopts contact friction type electromagnetic one with large vibration impact, high noise and insufficient security protection, it can’t meet the requirements of higher ride comfort and safety.A new controllable brake based on magnetorheological (MR) effect with advantages of easy to control and lower working noise is very promising for engineering application.Here, according to braking working condition requirements of traction elevator, to improve the device performance and braking safety, based on MR effect and the principle of permanent magnet braking, a new type of elevator brake with self-protection and double-protection was designed.Through analyzing the working principle of the new MR brake, the braking moment mathematical model of the device was established and influences of different parameters on braking performance were theoretically analyzed.According to working characteristics of elevator zero speed braking and emergency braking, test contents were determined, and the braking performance test platform was built to conduct braking torque testing, temperature characteristics one and working noise study.The test results showed that the developed elevator MR braking device with self-protection and heat radiation has higher braking torque, lower temperature rising, lower vibration and noise level to meet the design requirements.

Key words

elevator / braking device / magnetorheological (MR) effect / permanent magnet / braking performance / noise

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CHEN Kaifeng1,2, ZHENG Xiangpan1,2. Design and performance tests of a new MR braking device for traction elevator[J]. Journal of Vibration and Shock, 2020, 39(23): 165-175

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