Armature for DC motor
First Claim
1. An armature for a DC motor having a rotor axis, comprisinga plurality of circumferentially spaced armature segments arranged in a circle,a plurality of prewound electrical coils, anda plurality of flux links carrying respective ones of said electrical coils, said flux links bridging adjacent ones of said segments and being approximately aligned along a circular path centered on the rotor axis.
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Accused Products
Abstract
An armature for a DC motor includes a plurality of circumferentially spaced armature segments having salient poles with arcuate surfaces and air pockets formed within the poles adjacent to but not intersecting the surfaces, sized and located to reduce cogging due to variations in reluctance. The armature segments are preferably bridged by flux links carrying prewound electrical coils arranged in a circular path. Corresponding lamina in each armature segment are formed of a unitary stamping in which the segments are interconnected by removable flexible joints.
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Citations
17 Claims
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1. An armature for a DC motor having a rotor axis, comprising
a plurality of circumferentially spaced armature segments arranged in a circle, a plurality of prewound electrical coils, and a plurality of flux links carrying respective ones of said electrical coils, said flux links bridging adjacent ones of said segments and being approximately aligned along a circular path centered on the rotor axis.
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15. A DC motor with a rotor axis having reduced cogging torque, comprising
a field member having a plurality of circumferentially juxtaposed coaxial permanent magnet poles of alternating radial polarity, and an armature having a plurality of poles with coaxial surfaces, each pole being formed of a stack of laminations, said field member and armature being coaxially mounted with respect to said rotor axis for relative rotation in operative juxtaposition, each said armature pole having a plurality of axial apertures adjacent said coaxial surface continuously bounded by the respective pole in the radial direction relative to the axis of rotation for increasing the reluctance seen by the field member at a position corresponding to the angular location of said aperture, said apertures being arranged along a circular path centered on the rotor axis, adjacent ones of said apertures being spaced by a predetermined angle related to the number of said armature and field poles, the dimensions of said apertures being chosen to reduce cogging torque, the angle between said apertures being evenly divisible into 360/n° - , n being the number of aperture poles and not evenly divisible into any integer multiple of 360/q°
, q being the number of field poles. - View Dependent Claims (16, 17)
- , n being the number of aperture poles and not evenly divisible into any integer multiple of 360/q°
Specification