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Sensors 2017, 17(11), 2660; https://doi.org/10.3390/s17112660

Wireless Monitoring of Induction Machine Rotor Physical Variables

1
Programa de Pós-Graduação em Engenharia Elétrica, Universidade Federal do Rio Grande do Norte, Campus Universitário Lagoa Nova, Centro de Tecnologia, CEP 59078-970 Natal, Brazil
2
Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Norte, Campus Parnamirim, CEP 59143-455 Parnamirim, Brazil
*
Author to whom correspondence should be addressed.
Received: 29 August 2017 / Revised: 21 October 2017 / Accepted: 25 October 2017 / Published: 18 November 2017
(This article belongs to the Special Issue Wireless Rechargeable Sensor Networks)
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Abstract

With the widespread use of electric machines, there is a growing need to extract information from the machines to improve their control systems and maintenance management. The present work shows the development of an embedded system to perform the monitoring of the rotor physical variables of a squirrel cage induction motor. The system is comprised of: a circuit to acquire desirable rotor variable(s) and value(s) that send it to the computer; a rectifier and power storage circuit that converts an alternating current in a continuous current but also stores energy for a certain amount of time to wait for the motor’s shutdown; and a magnetic generator that harvests energy from the rotating field to power the circuits mentioned above. The embedded system is set on the rotor of a 5 HP squirrel cage induction motor, making it difficult to power the system because it is rotating. This problem can be solved with the construction of a magnetic generator device to avoid the need of using batteries or collector rings and will send data to the computer using a wireless NRF24L01 module. For the proposed system, initial validation tests were made using a temperature sensor (DS18b20), as this variable is known as the most important when identifying the need for maintenance and control systems. Few tests have shown promising results that, with further improvements, can prove the feasibility of using sensors in the rotor. View Full-Text
Keywords: wireless communication; energy harvesting; electrical machines maintenance; induction motor control systems; rotor temperature wireless communication; energy harvesting; electrical machines maintenance; induction motor control systems; rotor temperature
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Doolan Fernandes, J.; Carvalho Souza, F.E.; Cipriano Maniçoba, G.G.; Salazar, A.O.; de Paiva, J.A. Wireless Monitoring of Induction Machine Rotor Physical Variables. Sensors 2017, 17, 2660.

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