Most motor manufacturers quote efficiency numbers from motors that have advanced timing. Timing adjustment is easy with the Magmotor. Getting high efficiency from a low-Voltage motor is not easy. There are many factors that will have an effect on efficiency. The armature is wound with very heavy gauge wire, and all the space in the armature is used.
Some motors use skewed armature laminations to reduce cogging.
This has been shown to reduce efficiency and power. The Magmotor uses straight laminations, but the cogging is kept to a very low level by using a 42-bar commutator. This is probably the most important factor in achieving the high power and efficiency in our motor. As far as we know, the Magmotor has the highest efficiency of any 24-volt reversible permanent magnet DC brush motor. While all motors produce some electrical noise, cheaper motors with fewer commutator bars are more likely to send noisy voltage spikes back to your controller.