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AssigneeSchlumberger Technology Corporation
InventorsJacques Orban, Maxim Yurievich Vdovin, Alexey Yurievich Vdovin, Evgeny Mikhailovich Sviridov
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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; and a rotor assembly in the housing having brushes for connecting the collector segments, the brushes extending from the rotors parallel to the motor axis; wherein the brushes are attached to the rotors to rotate coaxially to each other and contact the surfaces of the collector segments. The system includes proper mechanism for heat conduction from the brushes sliding surface to the external wall. Damping is provided to limit resonance in the commutation system. Also air filtering can be provided to insure clean operation.
A commutation system for a DC motor having a stator including a plurality of windings and a permanent magnet assembly, the assembly comprising:
A commutation system according to any preceding claim, wherein brushes of the same polarity are connected to a spring to ensure contact between the brush and a collector segment.
A commutation system according to any preceding claim, wherein the collector segments are graphite.
A commutation system according to any preceding claim, wherein the brushes are made from a copper based material.
A commutation system according to any preceding claim, wherein the collector segments are connected in equivalent group and the windings attached to the collector segments are connected in parallel.
A commutation system according to any preceding claim, wherein the contact surface between the collector segments and the brushes is conical shaped.
A commutation system according to any preceding claim, comprising sliding contacts to supply power to the brushes.
A commutation system according to any preceding claim, wherein the space between each contact segment is filled with a wearable isolating material
A commutation system according to any preceding claim, further comprising an air cleaning system.
A commutation system according to any preceding claim, comprising friction pads positioned between relatively moveable parts of the system.
A commutation system according to any preceding claim, wherein the brushes are driven in synchronized rotation with the motor drive shaft via a magnetic coupling.
A commutation system according to any preceding claim, wherein the commutation system is located in a housing separate from the motor stator.
A commutation system according to any preceding claim, wherein the commutation housing is an atmospheric chamber.
A commutation system according to any preceding claim, wherein the brushes are stranded brushes.
A commutation system according to any preceding claim, wherein the commutation system has commutation angles between 120 to 180 degrees
Dependencies are inferred from the claim text.