Soft-commutated direct current motor
First Claim
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1. A method for soft commutation of a brush-type DC machine, having a plurality of armature coils, having a commutator and having at least two main brushes, the method comprising:
- making an electrical connection between two additional brushes and one of the armature coils before said one of the armature coils is disconnected from at least one of the main brushes; and
receiving and dissipating current from said one of the armature coils before said one of the armature coils is electrically disconnected from at least one of the main brushes.
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Abstract
A method and circuit is disclosed for soft-commutation of a direct current (DC) motor. An attenuation circuit is connected through auxiliary brushes A, A'"'"', B and B'"'"' to the commutator (16) to drain circuit from successive armature coils (15) before the main brushes (27, 28) disconnects from each of the coils (15). This prevents the spark generation that normally occurs in conventional DC motors. The attenuation circuit may also be connected before energization of the coil (15) for a soft turning on operation.
25 Citations
18 Claims
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1. A method for soft commutation of a brush-type DC machine, having a plurality of armature coils, having a commutator and having at least two main brushes, the method comprising:
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making an electrical connection between two additional brushes and one of the armature coils before said one of the armature coils is disconnected from at least one of the main brushes; and receiving and dissipating current from said one of the armature coils before said one of the armature coils is electrically disconnected from at least one of the main brushes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A circuit for soft commutation of brush-type DC machine, having a plurality of armature coils, having a commutator and having at least two main brushes, the circuit comprising:
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at least two additional brushes positioned to make an electrical connection to one of the armature coils before said one of the armature coils is electrically disconnected from at least one of said main brushes; and an attenuation circuit for receiving and dissipating current resulting from the electrical connection of the two additional brushes to one of the armature coils before said one of the armature coils is electrically disconnected from at least one of said main brushes. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification