Basics of DC Motor Power Density (Download)

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High power density is an important characteristic in most motors, even in a tiny motor with a high-power-output capability. A high-power-density motor (HPDM) is one that has a high ratio of power/volume.

The smallest motors can even have a high power output. HPDMs are low-speed, high-torque motors. These motors are usually lightweight, small, and have large amounts of torque and lower cogging torque. Cogging torque is defined as the torque necessary to overcome an opposing torque that’s created by the magnetic attractive force between the rotor magnets and the stator iron teeth.