Learn how to use wireless battery-free sensors to leverage rotor temperature data and increase your motor or generator life.

From industrial applications to generation stations, electric motors and generators can be found everywhere around us. As they are widely required worldwide, manufacturers continue to improve these products over time.

Electric motors and generators embed more and more electronics, including sensors of course. Sensing allows manufacturers to both design and service – maintenance – motors and generators based on objective data, which has led to ever more reliable and resilient models.


Hydro Generator

The rotor issue

However, there’s a critical component in electric motors and generators where little or no sensor data is available: the rotor.

Being a rotary part, sensors cannot be wired inside the rotor. Wireless solutions are available but the required maintenance – need to change batteries over time – is most of the times unacceptable because it leads to stopping the motor or generator, thus shutting down a complete manufacturing line.

Rotor temperature is critical

High temperatures are known as one of the main reasons why electric motors shut down, regardless of the type of motor.

In electric motors and generators, excessive heat causes rapid deterioration of winding insulation. In permanent magnet motors and generators, high temperatures can demagnetize the magnets so they will never work again even if temperatures return to normal levels.

Wireless battery-free sensors to monitor rotor temperature

Battery-free sensors allow users to embed sensors on the rotor itself. These sensors transmit temperature data to a fixed reader in the stator and will never require any battery change, meaning you will not have to shut down your production line and will still enjoy temperature data of the rotor.

On top of this, having historical data of rotor temperature while the motors are in operation provides designers with data to work with. New designs will be optimized due to empirical data of operating conditions.

In case you are interested in more information, feel free to download a free White Paper on this topic – Rotor Temperature Monitoring with Wireless Battery-Free Sensors.