How to Test the Motor and Propeller?

Oct. 26, 2022

Motor and propeller test kits are powerful tools for conducting motor and propeller tests.

A motor is an electromagnetic device that converts or transmits electrical energy according to the laws of electromagnetic induction.

A propeller is a device that converts engine rotational power into propulsive force by rotating the propeller blades through air or water. The purpose of a propeller is to convert the engine power transmitted to the propeller through the rotating shaft into quasi-linear thrust as efficiently as possible within the appropriate vehicle speed range.


How to Test the Motor and Propeller?cid=13

Why Test Your Motors and Propellers?


You must first ask yourself, what are your or your end user's needs? This question is important because it will help you understand which parameters to optimize. 

Do you want to fly longer to capture longer periods of time without interruption?

Do you want to carry a larger payload?

Do you need more thrust and power to go faster, or to improve handling in strong winds?

Do you have overheating issues and your application requires you to minimize failure rates?

The final choice of power system depends not only on the airframe and payload, but also on your application.


So What Parameters Should Be Measured?

Motor

To fully characterize the motor, you need to measure the following parameters.

Voltage (V)

Current (A)

Throttle input (%)

Motor Load or Torque (Nm)

Speed (RPM)


The software will automatically calculate the following parameters for you.

Mechanical power (Watts) = Torque (Nm) * Speed (rad/s)

Electrical power (Watts) = Voltage (V) * Current (A)

Motor efficiency = Mechanical power / Electrical power


Propellers

In order to extract useful propeller data, the following parameters need to be measured.

Speed (RPM)

Torque

Thrust


The software calculates the following parameters for you.

Mechanical power (Watts) = Torque (Nm) * Speed (rad/s) ← Same as motor

Propeller efficiency (g/Watts) = thrust (g) / mechanical power (Watts)


Note that the mechanical power of the motor and the propeller are the same. This is because all mechanical power output from the motor goes to the propeller, as it is directly connected to the motor's shaft.


Overall System

The overall performance of the system depends on a well balanced combination of motor and propeller. If these two parts are not well matched together, you will have a very inefficient system. Since these two parts have a common link (shaft), the overall system efficiency is calculated as follows.

System Efficiency (g/Watts) = Propeller Efficiency (g/Watts) * Motor Efficiency


In addition, the efficiency values are only valid for specific command inputs and mechanical loads. In practice, this means that you will test your motor over a range of command inputs and use multiple propellers to vary the mechanical load.


Are you interested in learning more about motor and propeller test kits for sale and how they can benefit you? Contact ustoday to secure an expert consultation!


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