US5059875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor and controller
Assignee: Individual
•
Filing: 1989-12-11
•
Granted: 1991-10-22
•
Expires: 2009-12-11
Abstract
Abstract An apparatus is provided that comprises a DC motor and a controller adapted to control the motor. The motor has a permanent magnet rotor and an electromagnetic stator. The rotor is divided into three permanent magnet sections which are separated by aluminum spacers. The stator has three groups of coils which are arranged around the three permanent magnet sections. The controller sequentially activates each of the three groups of coils at a predetermined rate thereby controlling the speed of the motor.
Inventors
- 👤 William A. De Salme
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:24
CPC Classifications
H; H02; H02K; H02K21/00; H02K21/12; H02K21/14; H02K21/20; H02K29/00; H02K29/06; H02P; H02P6/00; H02P6/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
191 words
A motor controller for a brushless DC motor having a permanent magnet rotor and a stator with stator windings comprising: (a) said rotor having three permanent magnet sections mounted about a central shaft; means for securing said permanent magnet sections on said shaft; each of said sections having a plurality of disc shaped magnets, and a spacing means for separating said permanent magnet sections; (b) a rectifier circuit rectifying an AC power source to supply rectified current to said stator windings; (c) pulse signal generation means for generating a pulse train signal having means for varying the pulse width and pulse rate of said signal so that the speed of said motor can be controlled; (d) control signal means connected to said pulse signal generation means for receiving said pulse signal and sequentially outputting motor control signals to said stator windings so that power is selectively applied to said stator windings; (e) cross-wired, double-pole double-throw switch for reversing the sequence of said pulse signals; (f) amplifying means connected to said control signal means for receiving and amplifying said control signals; (g) optical isolation means connected to receive said amplified control signals.
Claim 2
Dependent Claim
191 words
A motor controller for a brushless DC motor having a permanent magnet rotor and a stator with stator windings comprising: (a) said rotor having three permanent magnet sections mounted about a central shaft; means for securing said permanent magnet sections on said shaft; each of said sections having a plurality of disc shaped magnets, and a spacing means for separating said permanent magnet sections; (b) a rectifier circuit rectifying an AC power source to supply rectified current to said stator windings; (c) pulse signal generation means for generating a pulse train signal having means for varying the pulse width and pulse rate of said signal so that the speed of said motor can be controlled; (d) control signal means connected to said pulse signal generation means for receiving said pulse signal and sequentially outputting motor control signals to said stator windings so that power is selectively applied to said stator windings; (e) cross-wired, double-pole double-throw switch for reversing the sequence of said pulse signals; (f) amplifying means connected to said control signal means for receiving and amplifying said control signals; (g) optical isolation means connected to receive said amplified control signals.
Claim 3
Dependent Claim
14 words
The apparatus of claim 1 wherein said magnets are all of the same polarity.
Claim 4
Dependent Claim
62 words
The apparatus of claim 2, wherein said stator windings comprise 3 sections, each of said sections surrounding one of said permanent magnet sections and each of said stator winding sections having three pole pieces, each of said pole pieces being wound with coils of the same polarity so that each of said three stator winding sections has three pole pieces with coils.
Claim 5
Dependent Claim
29 words
The controller of claim 3 wherein said coils of each said stator winding section are connected in series, so that coils in the same winding section are in series.
Claim 6
Dependent Claim
12 words
The apparatus of claim 4 wherein said spacing means are aluminum discs.
Claim 7
Dependent Claim
17 words
The apparatus of claim 5 wherein said aluminum discs are about one-quarter of an inch in width.
Claim 8
Dependent Claim
26 words
The controller of claim 6 said pole pieces are separated from the said aluminum discs by an air gap or about one thirty-second of an inch.
References Cited (Backward Citations)
US3946292A
Cited
US4208621A
Cited
US4463291A
Cited
US4546293A
Cited
US4717864A
Cited
US4827196A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-10-21 | 1995-04-22 | 1995-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-21 | 1999-04-22 | 1999-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-21 | 2003-04-22 | 2003-10-22 | $7700.00 | Window Closed / Lapsed |