Patent US4642534A successfully refreshed from Google Patents.
US4642534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic driven motor
Assignee: Individual
•
Filing: 1985-07-15
•
Granted: 1987-02-10
•
Expires: 2005-07-15
Abstract
Abstract A motor having a rotor, said rotor being rotated by magnetic force, and having a novel switch for turning on and off an electrical field, and novel means for controlling said switch to provide a selected constant speed to said rotor, utilizing the attracting power and the repelling power of magnetic forces alternately.
Inventors
- 👤 Emile Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:27
CPC Classifications
H; H02; H02K; H02K25/00; H02P; H02P6/00; H02P6/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
117 words
A brushless DC motor comprising a source of electrical energy a first conductor leading therefrom to a coil, a rotor having magnets and cooperating with said coil, a glass enclosed switch adjacent said rotor, a second conductor connected to said coil and to said source of electrical energy through said glass enclosed switch creating a closed electrical circuit, said glass enclosed switch having magnetized contact points and gap, the poles of said magnetized contact points adapted to be attracted or repelled by said rotor magnets to control the rotation of said rotor, an adjustable magnet mounted adjacent said switch to alter the gap of said magnetized contact points to control the speed and direction of said rotor.
Claim 2
Dependent Claim
117 words
A brushless DC motor comprising a source of electrical energy a first conductor leading therefrom to a coil, a rotor having magnets and cooperating with said coil, a glass enclosed switch adjacent said rotor, a second conductor connected to said coil and to said source of electrical energy through said glass enclosed switch creating a closed electrical circuit, said glass enclosed switch having magnetized contact points and gap, the poles of said magnetized contact points adapted to be attracted or repelled by said rotor magnets to control the rotation of said rotor, an adjustable magnet mounted adjacent said switch to alter the gap of said magnetized contact points to control the speed and direction of said rotor.
Claim 3
Dependent Claim
20 words
A brushless DC motor as defined in claim 1 wherein said source of electrical energy is batteries or solar cells.
Claim 4
Dependent Claim
18 words
A brushless DC motor as defined in claim 1, further having a spark arrester connected across said coil.
Claim 5
Dependent Claim
38 words
A brushless DC motor as defined in claim 3 wherein said spark arrester is a capacitor, said capacitor being used to smooth the current flow through said coil and further to arrest spark in said glass enclosed switch.
Claim 6
Dependent Claim
19 words
A brushless DC motor as defined in claim 4, said capacitor prolonging the life of said electrical energy source.
Claim 7
Dependent Claim
19 words
A brushless DC motor as defined in claim 1 wherein said glass enclosed switch is a magnetized reed switch.
Claim 8
Dependent Claim
46 words
A brushless DC motor as defined in claim 6, wherein said adjustable magnet is mounted in front of said magnetized reed switch, said adjustable magnet being rotatable to vary the magnet polarity facing said magnetized reed switch to control the direction and speed of said rotor.
References Cited (Backward Citations)
US2492435A
Cited
JPS5812565A
Cited
US4496887A
Cited
US4504751A
Cited
US4499407A
Cited
US4553075A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-09 | 1990-08-11 | 1991-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-09 | 1994-08-11 | 1995-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-09 | 1998-08-11 | 1999-02-10 | $7700.00 | Window Closed / Lapsed |