{
  "patent_number": "US RE48399",
  "country": "US",
  "title": "How to Make Electric Motors Run Smoother and Last Longer",
  "original_title": "USRE48399E1 - Distributed winding arrangement for an electric motor",
  "summary": "A design for electric motor armatures that uses a specific ratio of winding slots to commutator bars to reduce electrical sparking and improve motor efficiency.",
  "what_it_does": "This patent describes a way to arrange the copper wire coils inside an electric motor to make it run more efficiently. By setting the number of commutator bars to be between one and two times the number of winding slots, the motor can better manage the magnetic fields generated during rotation. The design uses a specific overlapping pattern where sub-coils are serially coupled and wound with different turn counts to align the magnetic axis precisely with the commutator bars. This reduces the electrical arcing that typically occurs when the brushes contact the commutator, which helps the motor run cooler and last longer.",
  "what_it_does_not_cover": [
    "Does not cover brushless DC motors, as it relies on a commutator and brush system.",
    "Does not cover motors where the number of commutator bars is exactly double or equal to the number of winding slots.",
    "Does not cover motor designs that do not use the specific serial sub-coil winding arrangement described in the claims."
  ],
  "filed": "2018-08-22",
  "granted": "2021-01-19",
  "expires": null,
  "status": "active",
  "holder": "Black and Decker Inc",
  "holder_url": "https://patentbrief.org/company/black-and-decker-inc",
  "inventors": [
    {
      "name": "Wei Chen",
      "url": "https://patentbrief.org/inventor/wei-chen"
    },
    {
      "name": "Timothy W. French, Jr.",
      "url": "https://patentbrief.org/inventor/timothy-w-french-jr"
    },
    {
      "name": "Jin Fujun",
      "url": "https://patentbrief.org/inventor/jin-fujun"
    },
    {
      "name": "Steven Swaddle",
      "url": "https://patentbrief.org/inventor/steven-swaddle"
    }
  ],
  "times_cited": 0,
  "tags": [
    "consumer_electronics",
    "mechanical"
  ],
  "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.",
  "url": "https://patentbrief.org/patent/us/RE48399/action-camera-waterproof-housing",
  "markdown_url": "https://patentbrief.org/patent/us/RE48399/action-camera-waterproof-housing/md",
  "google_patents_url": "https://patents.google.com/patent/USRE48399",
  "relatedPatents": []
}