Patent US4169983A successfully refreshed from Google Patents.
US4169983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-rotor, direct current electric motor
Assignee: Individual
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Filing: 1978-06-21
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Granted: 1979-10-02
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Expires: 1998-06-21
Abstract
Abstract A pair of proximally spaced parallel rotors, the proximal area between the rotors defining a center position containing a center line extending through both rotary axes of the rotors, a plurality of circumferentially spaced magnets of alternating polarity around each rotor and a shielded electromagnet having a pole tip in the center position intercepting the center line, and means for alternating the polarity of the electromagnet as each pair of opposed magnets of like polarity on opposite rotors move through the center position, in order to magnetically draw the magnets approaching the center position and repel the magnets leaving the center position.
Inventors
- 👤 Donald W. Felder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:04
CPC Classifications
H; H02; H02K; H02K25/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
246 words
A multi-rotor, direct current, electric motor comprising: (a) a pair of proximal spaced rotors mounted for rotation about parallel rotary axes, the area between the closest spaced, opposed, circumferential surfaces of said rotors defining a center position containing a straight center line perpendicular to both rotary axes, (b) a plurality of radially disposed permanent magnets uniformly circumferentially spaced around the perimeter of each of said rotors, (c) said magnets on each rotor having outer poles of circumferentially alternating polarity, (d) means confining said rotors to rotary movement in opposite directions from each other so that poles of like polarity on opposite rotors oppose each other in said center position, (e) an electromagnet having a pole tip in said center position and intercepting said center line, and having magnetic shielding means projecting from said pole tip between the poles on opposite rotors trailing said center line, (f) means responsive to the rotation of said rotors energizing said electromagnet to alternately reverse the polarity of said pole tip as each pair of opposed poles moves past said center position to change said pole tip from a polarity opposite the polarity of said opposed poles to the same polarity as said opposed poles, and (g) said circumferential spacing between adjacent poles on each rotor being close enough that the pole next trailing said center line is attracted by said pole tip while the pole moving past said center line is repelled in the rotary direction of said respective rotor.
Claim 2
Dependent Claim
246 words
A multi-rotor, direct current, electric motor comprising: (a) a pair of proximal spaced rotors mounted for rotation about parallel rotary axes, the area between the closest spaced, opposed, circumferential surfaces of said rotors defining a center position containing a straight center line perpendicular to both rotary axes, (b) a plurality of radially disposed permanent magnets uniformly circumferentially spaced around the perimeter of each of said rotors, (c) said magnets on each rotor having outer poles of circumferentially alternating polarity, (d) means confining said rotors to rotary movement in opposite directions from each other so that poles of like polarity on opposite rotors oppose each other in said center position, (e) an electromagnet having a pole tip in said center position and intercepting said center line, and having magnetic shielding means projecting from said pole tip between the poles on opposite rotors trailing said center line, (f) means responsive to the rotation of said rotors energizing said electromagnet to alternately reverse the polarity of said pole tip as each pair of opposed poles moves past said center position to change said pole tip from a polarity opposite the polarity of said opposed poles to the same polarity as said opposed poles, and (g) said circumferential spacing between adjacent poles on each rotor being close enough that the pole next trailing said center line is attracted by said pole tip while the pole moving past said center line is repelled in the rotary direction of said respective rotor.
Claim 3
Dependent Claim
27 words
The invention according to claim 1 in which at least eight of said radially disposed permanent magnets are spaced around the perimeter of each of said rotors.
Claim 4
Dependent Claim
56 words
The invention according to claim 1 in which each of said permanent magnets comprises a horseshoe magnet having a pair of uniformly, axially, spaced poles of opposite polarity, said electromagnet having a horseshoe shape and a pair of axially spaced pole tips of substantially the same axial spacing as the outer poles of said permanent magnets.
Claim 5
Dependent Claim
45 words
The invention according to claim 1 in which said means energizing said electromagnet comprises electrical rotary communicator means having rotary contact elements mounted for rotation about the rotary axis of one of said rotors, and means for electrically connecting said commutator means to said electromagnet.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-01 | 1983-04-02 | 1983-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-01 | 1987-04-02 | 1987-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-01 | 1991-04-02 | 1991-10-02 | $7700.00 | Window Closed / Lapsed |