Dynamometer testing plays a key role in the development and characterization of motors and motor controllers. These pieces of test equipment can take a number of different forms and have a variety of instrumentation to collect all the data a company needs. Plus, they do not just serve a role for design companies, but help with powertrain component selection.

Power density is a measure of how much power a motor controller can deliver for its given size. Higher power density makes a controller easier to fit into a vehicle or drone while meeting performance requirements. It also tends to mean a motor controller is more efficient. However, when using this value to compare manufacturers, you need to ensure that the numbers are being calculated using the same conditions.