Geared motors should be selected by torque, speed, encoder support and stall current.
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The best geared motor depends on robot size. N20 motors fit tiny robots, TT motors fit classroom cars, planetary gear motors fit stronger rovers and wheelchair motors fit payload platforms.
Always check stall current. A motor that looks small can still destroy a weak driver when blocked.
Pulling current matching products on AliExpress…
TT motors with TB6612FNG.
Wheelchair motors with current-rated controllers.
Use encoders when distance and straight-line motion matter.
Higher ratio gives torque, lower ratio gives speed. Most robots need torque first.
Stall current above driver rating.
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