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US 9,425,663 B2Granted
Distributed winding arrangement for an electric motor
AssigneeBlack & Decker Inc.
InventorsWei Chen, Jin Fujun, Steven Swaddle, Timothy W. French, Jr.
Life of this patent
Estimating the term…
Abstract
A distributed winding arrangement for an electric motor is provided that reduces brush arcing while reducing the size of the commutator. The electric motor is comprised generally of an armature having a plurality of spaced apart posts defining a plurality of spaced apart winding slots; a stator disposed coaxially with the armature; and a commutator having a plurality of commutator bars, where the number of commutator bars is an integer greater than the number of winding slots but less than twice the number of winding slots provided by the armature.
Claims20
An electric motor, comprising:
- an armature having a plurality of spaced apart posts defining a plurality of spaced apart winding slots;
- a commutator having a plurality of commutator bars, where the number of commutator bars is an integer greater than the number of winding slots but less than twice the number of winding slots;
- a stator disposed coaxially with the armature, the stator having a plurality of spaced apart field coils;
- the armature including:
- a first coil having a first plurality of winding turns wound only in a first pair of spaced apart ones of the winding slots and;
- a second coil having a first and second subcoil portions serially coupled together, the first subcoil portion having a plurality of winding turns wound in the first pair of spaced apart winding slots, and the second subcoil portion having a plurality of winding turns wound in a second pair of spaced apart winding slots that are circumferentially offset from the first pair of spaced apart winding slots, wherein the first coil and the first subcoil portion of the second coil are wound with different number of winding turns so that a resultant magnetic axis of the first coil lies at a predetermined angular position relative to a first pair of commutator bars to which the first coil is secured;
- a third coil having a first and second subcoil portions serially coupled together, the first subcoil portion having a plurality of winding turns wound in the second pair of spaced apart winding slots, and the second subcoil portion having a plurality of winding turns wound in a third pair of spaced apart winding slots that are circumferentially offset from the second pair of spaced apart winding slots, wherein the second subcoil portion of the second coil and the first subcoil portion of the third coil are wound with different number of winding turns so that a resultant magnetic axis of the second coil lies at a predetermined angular position relative to a second pair of commutator bars to which the second coil is secured.
4 more elements
An electric motor, comprising:
- an armature having a plurality of spaced apart posts defining a plurality of spaced apart winding slots;
- a commutator having a plurality of commutator bars, such that the number of commutator bars is one and one half the number of winding slots;
- a stator disposed coaxially with the armature, the stator having a plurality of spaced apart field coils;
- the armature including:
- a first coil being wound in a first pair of spaced apart ones of the winding slots and having a first plurality of winding turns;
- a second coil having a first and second subcoil portions, the first subcoil portion being wound in the first pair of spaced apart winding slots so as to overlap the first coil and having a plurality of winding turns that is one third the number of winding turns of the first plurality of winding turns, and the second subcoil portion being wound in a second pair of spaced apart winding slots that are offset from the first pair of spaced apart winding slots and having a plurality of winding turns that is two thirds the number of winding turns of the first plurality of winding turns;
- a third coil having a first and second subcoil portions, the first subcoil portion being wound in the second pair of spaced apart winding slots so as to overlap the second subcoil portion of the second coil and having a plurality of winding turns that is two thirds the number of winding turns of the first plurality of winding turns, and the second subcoil portion being wound in a third pair of spaced apart winding slots that are offset from the second pair of spaced apart winding slots and having a plurality of winding turns that is one third the number of winding turns of the first plurality of winding turns.
4 more elements
An electric motor, comprising:
- an armature having a plurality of spaced apart posts defining a plurality of spaced apart winding slots;
- a commutator having a plurality of commutator bars, where the number of commutator bars is an integer greater than the number of winding slots but less than twice the number of winding slots;
- a stator disposed coaxially with the armature, the stator having a plurality of spaced apart field coils;
- the armature including:
- a first coil having a first plurality of winding turns wound only in a first pair of spaced apart ones of the winding slots and;
- a second coil having a first and second subcoil portions serially coupled together, the first subcoil portion having a plurality of winding turns wound in the first pair of spaced apart winding slots, and the second subcoil portion having a plurality of winding turns wound in a second pair of spaced apart winding slots that are circumferentially offset from the first pair of spaced apart winding slots, wherein the first coil and the first subcoil portion of the second coil are wound with different number of winding turns so that a resultant magnetic axis of the first coil lies at a predetermined angular position relative to a first pair of commutator bars to which the first coil is secured;
- a third coil having a first and second subcoil portions serially coupled together, the first subcoil portion having a plurality of winding turns wound in the second pair of spaced apart winding slots, and the second subcoil portion having a plurality of winding turns wound in a third pair of spaced apart winding slots that are circumferentially offset from the second pair of spaced apart winding slots, wherein the second subcoil portion of the second coil and the first subcoil portion of the third coil are wound with different number of winding turns so that a resultant magnetic axis of the second coil lies at a predetermined angular position relative to a second pair of commutator bars to which the second coil is secured.
4 more elements
Dependencies are inferred from the claim text.