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DC Motor with Activated-Charcoal Internal-Filtering Disclosure Number: IPCOM000033269D
Original Publication Date: 2004-Dec-02
Included in the Prior Art Database: 2004-Dec-03
Document File: 2 page(s) / 35K

Publishing Venue



A serious motor problem can occur for brush DC (direct current) motors when volatiles enter the motor. Such volatiles could include low molecular weight siloxanes. The volatiles can oxidize on the motor commutator and form insulating deposits, such as SiO2, which can raise the resistance to current flow to the armature of the motor and eventually causes the motor to fail. We propose the use of activated charcoal and/or titanium within the DC motor to absorb impurities before they can damage the DC motor.

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DC Motor with Activated-Charcoal Internal-Filtering

Figure 1 shows DC servo motor 100. Servo motor 100 comprises outer casing 101 and permanent magnets 102. Armature 103 revolves around shaft 104. Servo motor 100 has end plates 105 and 106 which support shaft 104 and armature 103. Power is provided to the commutator on shaft 104 via one or more cantilevered brushes 107. Cantilevered brush 107 is preferably a highly conductive metal, such as copper. To help cantilevered brush 107 maintain continual contact with the commutator on shaft 104, dampening material 108 is placed on brush 107.

The preferred solution is to utilize activated charcoal. For example, the dampening material 108 could be impregnated with activated charcoal. Since the dampening material is very close to the commutator, this would help absorb any volatiles in the vicinity of the commutator. Secondly, the interior surface 109 of end plate 105 and interior surface 110 of end plate 106 be roughened and coated with a thin layer of activated charcoal. By roughening interior surfaces 109 and 110, the surface area would be increased, which would allow for more deposition of activated charcoal.

As an additional embodiment involving activated charcoal, vent hole 111 could be provided. Vent hole 111 would be filled with a filter comprising porous activated charcoal. This would allow air to enter the interior of the motor and volatile impurities would be filtered out. This filter of activated charcoal could...