Ebike and Escooter hub motors come in two common configurations
Geared motor and direct drive motors
Due to the lack of gears, direct drive hub motors are the simpler of the two, so we’ll start with those.
Gearless (direct drive) hub motors
In a direct drive hub motor, the axle that passes through the center of the motor is actually the axle of the motor itself, with the copper windings fixed to the axle. This whole axle assembly is called the “stator”. Magnets in this motor are mounted to the outer shell of the hub motor. When electricity is applied to the stator a magnetic field is induced that causes the magnets to move. This in turn makes the whole shell of the motor turn and propels the Escooter forward.
Geared hub motors
On the other hand, geared hub motors have their cases connected to the stator via a planetary gear reduction system. For each rotation of the case, the motor inside actually rotates many times faster. This allows the motor to work at higher and more efficient speeds, while still allowing the wheel to spin at a comparatively slower riding speed.
Comparing between Geared vs Direct Drive Motors
In general Direct drive hub motors are capable of providing large amounts of torque and power. This makes them especially well suited for higher performance eScooters. Direct drive motors are usually big and heavy which adds to overall bike weight and decreases range. On the upside, this extra mass helps the motor to keep from overheating as easily because the thermal mass of the motor functions as a heat sink.
However, if you’re looking at keeping your Escooter light and retain performance around 36-48v, Geared Motors are smaller and lighter which help increase range. Most importantly, Geared Motors provide 40-50% more torque on existing battery and controller setups. This is ideal on Escooters such as the popular DYU eScooter which has low torque on a 9amp stock controller.
For more information on PT Scoot Type-G Geared Motors you can click here