When looking at electric motors, it is not only important to understand how they work, but also how efficient they are. It is important to know that no motor is 100% energy efficient. This is because energy is lost when converting it from electrical to mechanical.
However, you can still have very operationally efficient motors and their efficiency can be calculated in order for you to have some idea of the output you will get. The motor’s efficiency can be calculated when dividing the power output in wattage, by the power input in wattage. To simplify the maths, this calculation will help you compare the amount of energy you are using, to the output you are getting, to determine how energy efficient the motor is.
Of course, there are also other types of efficiency to consider when using an electric motor. Energy efficiency will have an impact on operational efficiency; the more energy used to power your motor, the more it will cost and the less operational efficiency it will have.
Efficiency goes beyond the output of the motor itself. If you compare an electric motor to an internal combustion motor, they use 50% fewer parts and around 30% less labour to make.