How Do I Compare Angle Sensors From Different Manufacturers?

When it comes to comparing angle sensors from different manufacturers, it can be a daunting task. How do you compare angel sensors? With so many options available, it can be challenging to determine which sensor is the best fit for your needs. However, there are a few key factors to consider when comparing angle sensors that can help you make an informed decision.

Accuracy

One of the most critical factors to consider when comparing angle sensors is accuracy. The accuracy of an angle sensor is determined by its resolution, which is the smallest change in angle that the sensor can detect. They can be absolute or incremental. When comparing sensors, look for the one with the highest resolution, as this will provide the most accurate readings.

For e-bikes, the accuracy is really not that important. Resolution is more important, but only to a point. Detecting crank movement fast is important when starting, but movements less than 1-2 degrees can be vibrations. For this reason, a resolution in the range 1-2 degrees is normally sufficient. Some specify this in terms of “pulses” per revolution. One degree resolution would then be specified as 360 pulses per revolution.

Range

Another important factor to consider when you want to compare angle sensors is the range of angles that the sensor can measure. Some sensors have a limited range, while others can measure angles up to 360 degrees. Consider the range of angles that you need to measure and choose a sensor that can accommodate your needs.

For use with electric bikes, a range of 180 degrees is often sufficient as the torque more or less repeats (for the other leg) after each half-rotation of the crank. Rarely would a motor controller algorithm have to distinguish if the rider is pushing with one leg or the other.

Output

The output of an angle sensor is another critical factor when comparing sensors. Some sensors provide analog output, while others provide digital output. Digital output is typically more accurate and easier to work with, but analog output may be necessary for certain applications. Consider the type of output that you need and choose a sensor that provides the appropriate output.

Environment and Reliability

Components for any bike application should be selected with due respect to the environment they are used in to ensure high reliability. Any type of optical angle sensor may develop issues due to dirt obstructing the path of the light. With magnet-based sensors, there is always the risk that small metal particles from the grinding of a gear or other metal parts accumulate on the magnets. Inductive angle sensor principles are really good for reliability in almost all types of harsh environments.