Patent ID: 6713929
Filing Date: 2004-03-30
Classification: H02K,H02P

Abstract:
A series-wound motor comprising:an armature including a commutating armature coil; a stator forming a closed yoke within which said armature is mounted rotatably, said stator having first and second axial ends; brushes connectable to a voltage source for sliding contact with said armature coil; at least two field poles provided on said stator, each said field pole comprising a center section being integral with said closed yoke and further comprising two pole horns extending circumferentially from said center section and defining first and second axial grooves extending between said closed yoke and said pole horns; at least two field coils attached to said stator, each said field coil having two axial ends and two lateral parts extending between said axial ends, each said field coil being received with its lateral parts within said axial grooves and protruding with its axial ends beyond said first and second axial ends of said stator; wherein at least one of said pole horns comprises at least a first protrusion protruding circumferentially from an axial edge of said pole horn and a second protrusion protruding circumferentially from said axial edge of said pole horn; wherein each one of said pole horns comprises at least a first protrusion protruding circumferentially from an axial edge of said pole horn and a second protrusion protruding circumferentially from said axial edge of said pole horn; wherein each said field coil is configured as a preformed winding, and wherein said lateral parts of said field coils are retained within said axial grooves of said stator by said first and second protrusions; and wherein said first and second protrusions are arranged at said first and second axial ends of said stator.