US3753068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled speed electric motor
Assignee: ELECTRO CRAFT CORP
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Filing: 1971-11-09
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Granted: 1973-08-14
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Expires: 1991-11-09
Abstract
Abstract A variable, multiple speed direct current electric motor having a low power requirement for multiple high speed operation and low variable speed operation. A direct current armature is rotatably mounted in a frame which includes a first and a second source of magnetic flux energy. One of the sources is of substantially constant magnitude and the other is adjustably variable. The sources of magnetic flux energy are axially spaced apart so that the magnetic field from each of them may be linked to different portions of the armature and its conductors along any given axial length thereof. In various modes of operation the effect of the variable source of magnetic flux may be used in an additive or subtractive sense, with respect to the axially extending conductors or the armature to provide a multiple high speed operation having low driving voltage requirements for the armature supply, or in a variable low speed operation to materially reduce the driving current requirements for the armature supply. The overall result is a motor providing improved performance characteristics over a wide range of speed of operation while reducing the power requirements and the complexity of the power supplies and controllers.
Inventors
- 👤 P Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:04
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/298
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
135 words
A variable speed motor comprising in combination; a frame; an armature rotatably journalled for rotation within said frame, said armature being comprised of a plurality of coil windings, each having conductors extending axially of said armature from end to end thereof; a first source of magnetic energy disposed concentrically of the axis of rotation of said armature and in magnetic energy transmitting relationship with a portion of the axial length of the conductors on said armature; a second source of magnetic energy disposed concentrically of the axis of rotation of said armarture and in magnetic energy transmitting relationship with a second portion of the axial length of the conductors on said armature; first and second sources of magnetic energy being axially displaced and in axial alignment one of said sources of magnetic energy being variable.
Claim 2
Dependent Claim
135 words
A variable speed motor comprising in combination; a frame; an armature rotatably journalled for rotation within said frame, said armature being comprised of a plurality of coil windings, each having conductors extending axially of said armature from end to end thereof; a first source of magnetic energy disposed concentrically of the axis of rotation of said armature and in magnetic energy transmitting relationship with a portion of the axial length of the conductors on said armature; a second source of magnetic energy disposed concentrically of the axis of rotation of said armarture and in magnetic energy transmitting relationship with a second portion of the axial length of the conductors on said armature; first and second sources of magnetic energy being axially displaced and in axial alignment one of said sources of magnetic energy being variable.
Claim 3
Dependent Claim
19 words
The apparatus of claim 1 in which said one of the sources of magnetic energy is of reversible polarity.
Claim 4
Dependent Claim
19 words
The apparatus of claim 1 in which said one of the sources of magnetic energy is of variable magnitude.
Claim 5
Dependent Claim
22 words
The apparatus of claim 1 in which said one of the sources of magnetic energy is of variable magnitude and reversible polarity.
Claim 6
Dependent Claim
23 words
The apparatus of claim 1 in which said one of the sources of magnetic energy is comprised of a plurality of coil windings.
Claim 7
Dependent Claim
26 words
The apparatus of claim 1 in which the other of the sources of magnetic energy is comprised of a plurality of low permeability, radially polarized members.
Claim 8
Dependent Claim
23 words
The apparatus of claim 1 in which the sources of magnetic energy are mounted in adjacently disposed cylindrical members concentrically of the armature.
Claim 9
Dependent Claim
45 words
The apparatus of claim 7 in which a pair of end cap members, each having a centrally located bearing member receiving one end of the armature, are disposed on respective open ends of the cylindrical members and connecting means extend intermediate said end cap members.
Claim 10
Dependent Claim
86 words
In combination with a variable speed motor; first and second sources of magnetic energy, at least one of which includes a coil winding disposed axially of an armature of a motor, said armature including coil windings having conductors extending from end to end of said armature; a source of electrical energy; first circuit means connecting said source of energy to one of the sources of magnetic energy in a motor; and second circuit means connecting said source of electrical energy to the armature on said motor.
Claim 11
Dependent Claim
86 words
In combination with a variable speed motor; first and second sources of magnetic energy, at least one of which includes a coil winding disposed axially of an armature of a motor, said armature including coil windings having conductors extending from end to end of said armature; a source of electrical energy; first circuit means connecting said source of energy to one of the sources of magnetic energy in a motor; and second circuit means connecting said source of electrical energy to the armature on said motor.
Claim 12
Dependent Claim
33 words
The apparatus of claim 9 in which the first circuit means includes means for controlling the magnetiude and sense of the electrical energy transmitted therethrough in accordance with the speed of the motor.
Claim 13
Dependent Claim
21 words
The apparatus of claim 9 in which the first circuit means includes means for variably energizing the source of magnetic energy.
Claim 14
Independent Claim
75 words
The method of controlling the speed of a rotating armature including continuous end to end conductors, having a finite axial length, which comprises; subjecting an armature to a first source of magnetic energy over a portion of its axial length; subjecting an armature to a second source of magnetic energy over another portion of its axial length; and varying the magnitude or sense of one of said sources of magnetic energy in a predetermined manner.
Claim 15
Independent Claim
75 words
The method of controlling the speed of a rotating armature including continuous end to end conductors, having a finite axial length, which comprises; subjecting an armature to a first source of magnetic energy over a portion of its axial length; subjecting an armature to a second source of magnetic energy over another portion of its axial length; and varying the magnitude or sense of one of said sources of magnetic energy in a predetermined manner.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |