Patent ID: 6680596
Filing Date: 2004-01-20
Classification: H01R,H02K,H02P

Abstract:
A commutator electric motor having electrical braking capability for use in machine tools, the motor comprising:a stator including one or more field windings; an armature having windings and being rotatably mounted within said stator and a commutator mounted for rotation with said armature; at least first and second pairs of brushes located on opposite sides of and adapted to be brought into physical contact with said commutator, said first pair of brushes being angularly displaced from said second pair of brushes; an activating mechanism for selectively bringing one of said first or second pairs of brushes into physical contact with said commutator; a drive circuit adapted to be powered by a power source for energizing the motor, said drive circuit including said first pair of brushes; a regenerative brake circuit connected to said armature winding and to one field winding, which when activated, is adapted to establish a regenerative current flow across said commutator and said second pair of brushes; at least one switch mechanism operable between a first position wherein said drive circuit is energized and said brake circuit is deactivated and a second position wherein said drive circuit is deenergized and said brake circuit is activated.