 Proceedings of Engineering and Technology Innovation , vol. 4, 2016, pp. 34 - 36 34 A Circuit Device of Detecting the Bearing Deflection Chien-Yu Lu 1 , Shuai-Feng Lin 2,* , Alvin Chang 3 1 Department of Industrial Education and Technology, National Changua University of Education, Changhua, Taiwan. 2, 3 Department of Industrial Education and Technology, National Changua University of Education, Changhua, Taiwan. Received 17 March 2016; received in revised form 10 April 2016; accept ed 23 April 2016 Abstract This paper investigates the operation of the motor caused by the bearing deflection, we will design detection circu it to detect bearing de- flection, the circuit includes coil, rectifier circuit and voltage measuring device. In the interior of the motor, coil has been designed in gap between the stator silicon steel, and then connect a recti- fie r c ircuit to an e xternal motor, the rectifie r circuit is connected to the voltage measurement terminal. When bearings close to stator silicon steel in the operation of the motor, the induced voltage of the coil will rise and transmit the voltage to rectifier c ircuit instantly. In this case, the voltage rectifier circuit will convert the DC voltage, the voltage delivered to the voltage measure ment termina l, at this time, users can know the motor bearings have deflected phe- nomenon based on the DC voltage , and can immed iately imp rove motor and maintenance operations. Ke ywor ds : coil, bearing deflection, rectifie r circuit, voltage measurement 1. Introduction Motors have been widely used in conven- tional industries, manufacturing industries and technology industries. The inverter and A C servo drives are the fastest updating products, ma king it e xt re me ly competit ive in performance and cost. AC drive technology is also one of the core technologies . [1] This paper aims to e xp lore the device capable of detecting deflect ion of the motor bearing; The reason behind this is the deflection of the motor shaft when rotating at high speeds, [2] causing frict ion between the shaft and the motor that generates loud noises which lead to damag ing the motors ’ durability and the loss of precision of the shaft, [3] further effecting accuracy of the machine. The device to ensure orderly functions of the motor shaft after repair, and to decide if further steps are required are as shown in Fig. 1. Fig. 1 Implementation of Equipment Fig. 2 Non-deflection motor shaft Principle : When the motor shaft is rotating at high speeds (no matter forward or reverse), the shaft will be met with ev ident deflection. As the shaft nears the stator silicon sheet, [4] there will be a significant rise of voltage fe lt by the in- ductor, after the voltage will be sent to the re c- * Corresponding author. Email: powerm4vm0@gmail.com http://terms.naer.edu.tw/detail/112073/?index=2 http://terms.naer.edu.tw/detail/112073/?index=2 Proceedings of Engineering and Technology Innovation , vol. 4, 2016, pp. 34 - 36 35 Copyright © TAETI tifier c ircuit, there it converts the AC voltage is DC voltage; the voltage is then measured for a voltage value data. This voltage value [5] is used for the measurement of the distance between the shaft and the stator silicon sheet which is proof of deflection happening to the motor shaft, and conduct immediate motor ma intenance. Deflec - tion and non-deflection are as shown in Fig. 2 and 3. Fig. 3 Deflection of motor shaft This paper investigates electronically lin king a rectifie r c ircuit to a monitoring device. An alarm is set to go off when the voltage value pre-set by the user in the rectifier c ircuit is reached, and to remind the user to repair the shaft deflection. Installment of monitoring de- vice is in Fig. 4. Fig. 4 Installment of monitoring device 2. Method This design is aimed towards a device that can detect and measure shaft deflection, pri- ma rily consisting of the inductor unit, rectifie r circuit and voltage measurement. 2.1. Design Requirements (1) Inductor unit: Placed in the gap of the stator silicon sheet inside the motor, the inductance coil. [5] (2) Rectifie r circuit: Placed on the exterio r of the motor, and electronica lly linked to the in- ductor unit. Its function is to convert AV voltage fro m the inductor unit into DC voltage. The rect ifier circuit inc ludes elec- tronically linked circuit co mponents and electronic co mponents. Circuit co mponents are capacitance and electronic components are diodes. (3) Vo ltage measurement: Placed on the exterior of the motor and electronically lin ked to the rectifier c ircuit. Its function is to convert the voltage into voltage value data. It is a three meter unit and is electronica lly linked to a monitoring device. (4) Monitoring device: It is electronica lly linked to the metering unit. The ala rm to re mind the user is set to go off when the pre-set voltage value is reached, it serves as a maintenance reminder for the shaft. 3. Results and Discussion This design is based off existing motor tech- nology, but designed for detecting shaft deflec- tion, to create new techniques for lowering damages to the motor when running . 4. Conclusions The motor is widely used in the manufactur- ing industry. Any machine that produces force is run by a motor, making the debate for this de- vice’s usage un-necessary. The advantage of applying this device is that it lowers damages upon the motor when running, predicting d eflec- tion happenings on the motor for the user to conduct immediate ma intenance, and to ensure orderly functions . Acknowledgement This is research is directed by Dr. Chien-Yu Lu, who lead this research team to continue improving and finishing this project. Without Dr. Lu, this research cannot complete. In addition, I need to thank Mr. Alvin Chang who supports searching information abroad. Finally, all of the researchers and faculties in the department worth the honors going to be earned by this project. Thank you all for the diligent efforts . Proceedings of Engineering and Technology Innovation , vol. 4, 2016, pp. 34 - 36 36 Copyright © TAETI References [1] I. Y. Shao, “ Introduction to motor control power e lectronics laboratory,” National Jiao Tung Univ., Dept. of Electronic Engineer- ing, Technical Report, Hsinchu County, Taiwan. [2] R. To mović , “Ca lculat ion of the boundary values of rolling bearing deflection in rela - tion to the number of active rolling ele - ments,” Mechanism and Machine Theory, vol. 47, pp. 74-88, 2012. [3] C. Y. Shih “ Vehic le stability control for an electric vehic le with dual wheel motors,” Unpublished. [4] J. S. Jhang, Y. H. Tsai, and S. M. Yang, “Optimization and e xpe rimental verific - ation of an a xial magnetic bearing,” 31 st Conference of Electrical Engineering , De - cember 2010. [5] R. Abdollahi, “Ha rmonic mit igation using 36-Pu lse AC-DC converter for d irect torque controlled induction motor drives,” Journal of Applied Research and Technology, vol. 13, pp. 135-144, February 2015.