04-02-2017, 03:09 PM
A brush-less servo motor has permanent rotating magnets and a fixed armature, eliminating the problems of current connection to the moving frame. An electronic controller replaces the brushed DC motor brush / switch assembly, which continuously changes the phase to the windings to keep the motor spinning. The controller performs a similar timed power distribution using a solid state circuit instead of the brush / switch system.
Brush-less motors offer several advantages over brushed DC motors, including more torque per weight and efficiency, reliability, noise reduction, longer life (no brushing and erosion of the manifold), elimination of ionizing sparks from the manifold, higher power and General reduction of electromagnetic interference (EMI).
Without windings in the rotor, they do not undergo centrifugal forces, and because the windings are supported by the housing, they can be cooled by conduction, without needing air flow inside the engine for cooling. This in turn means that the engine internals can be completely closed and protected from dirt or other foreign matter.
Brush-less motors offer several advantages over brushed DC motors, including more torque per weight and efficiency, reliability, noise reduction, longer life (no brushing and erosion of the manifold), elimination of ionizing sparks from the manifold, higher power and General reduction of electromagnetic interference (EMI).
Without windings in the rotor, they do not undergo centrifugal forces, and because the windings are supported by the housing, they can be cooled by conduction, without needing air flow inside the engine for cooling. This in turn means that the engine internals can be completely closed and protected from dirt or other foreign matter.