# Motor current consumption and power do not match

I am working on a design and need to calculate the energy consumption of this motor:

https://www.maxonmotor.com/medias/sys_master/root/8825428410398/17-EN-256.pdf. (Part No. 339252)

The manufacturer's specifications states:

Nominal current (max. continuous current): 0.402 A and Nominal voltage: 12 V.

Based on this, my understanding is that the power consumption of the motor should be 0.402 A x 12 V = 4.824 watt

However the manufacturer lists this motor as 1.5 W.

How is this adding up? Shouldn't this be a 4.8 W motor? Can you please help me understand how the current (0.402 A) and voltage (12 V) and power (1.5 W) are related? Is there anything else in that specification sheet that I am missing?

• You're missing one piece of the equation - the load on the motor. Voltage, current, and torque are related. Aug 12, 2018 at 23:40

What you have calculated is the electrical input power and this does not equal the mechanical output power ($2\pi n T$).