Patent ID: 8742643
Filing Date: 2014-06-03
Classification: H02K

Abstract:
1. A commutation system for a DC motor having a stator including a plurality of windings and a permanent magnet assembly, the assembly comprising: a housing; at least three collector segments connected to stator windings inside the housing; a rotor assembly in the housing including a rotor having a rotary distributor with brushes for connecting the collector segments, the brushes extending from the rotor parallel to a motor rotation axis; wherein the brushes are attached to the rotor to rotate coaxially therewith and to contact a surface of the collector segments, wherein the commutation system has commutation angles between 120 to 180 degrees and contact surfaces of the brushes and the collector segments lie substantially perpendicular to the motor rotation axis; a spring disposed in the housing; a plurality of tubular sliding electrodes positioned between the spring and the rotary distributor, the spring acting in an axial direction against the plurality of tubular electrodes to maintain contact between the contact surfaces of the brushes and the collector segments; and a plurality of apertures extending along the at least three collector segments to facilitate air circulation.