Implementation And Evaluation of The Bearing Monitoring System in The

EV Field Using Vibrations Sensors in The Context of Maintenance Engineering

A common technology in the electric’s actuators field, are electromotors controlled in frequency. These are used on a wider scale in the automotive industry for being easy to adjust the power, torque, and direction of rotate. This kind of control is made through adjusting the current frequency supply of the motor. The basic principle of frequency control is that the speed of an engine is directly proportional with the frequency supply current and backwards with the number of motor pols pairs. Therefore, through changing the supply current frequency, we can control the motor speed and direction of rotation, without being necessary to change mechanical equipment.

Regular maintenance of bearings that equips an electric motor, is a real requirement that will ensure proper operation of the equipment for a longer period.

A common problem with electric motors that equip electric vehicles is the appearance of wear of the bearings that support the axis of the electric motor. The consequence is destruction of these bearings and the complete destruction of the electric motor, and the repair is very expensive.

In this case, our work presents the conception, implementation, and evaluation of a monitoring system for bearings used in the EV field, to detect anomalies occurred during the operation of the electric motor.

The bearing condition monitoring system is composed of vibrations and temperature sensors that have the role of detecting changes in vibration level of the electric motor, that can warn malfunctions in equipment when detected: bearing wear, imbalance, or other operating problems.

For monitoring the condition of bearings, the following aspects will be considered:

-        Choosing the appropriate sensors.

-        Positioning of sensors.

-        System configuration and calibration.

-        Integration with EV monitoring (diagnosis) system.

-        Data analysis and corrective actions.

By installing these sensors to monitor the bearings, it will be possible to intervene in time on the respective equipment to prevent major damage and guarantee an efficient and reliable long-term operation.

This work is part of a complex project called “Advanced mobile system for monitoring air quality and traffic values in crowded urban areas”, which consists in creation of an electric vehicle that monitors air quality values, in traffic.

Coordinator:

Prof. Dr. Eng. Panait Paula

Students :

Barbu Dumitrel

Ferchiu Raul

Silivestru Valentin