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What is motor efficiency?

 The motor efficiency is calculated and derived: 

motorefficiency1

The thrust stand measures the torque generated by the motor on the load measurement unit and the rotation speed by the optical RPM probe. Voltage and current are the input DC power into the ESC. The motor efficiency is dimensionless.

The motor efficiency is an important factor:

  • To determine whether the motor and the ESC are working well together
  • To calculate the flight time and the overall flight performance

Generally, the motor efficiency (%) will increase when increasing the speed, until it starts to go down.

Please take note that the motor efficiency is the combined efficiency of the motor and the ESC. The electrical power is the power consumed by the ESC and the motor.

At this stage, we do not have any product that can measure the AC output (voltage and current) from the ESC to the motor.