US3628111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for removing irregularities in rotation from synchronous motor
Assignee: Victor Company of Japan Ltd
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Filing: 1969-12-03
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Granted: 1971-12-14
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Expires: 1989-12-03
Abstract
Abstract An electronic control system removes any irregularities in the rotation of an electrical motor by introducing a controlled DC bias component in the armature or field windings of the motor. The DC bias level is selected to produce a magnetic field which adds to or subtracts from the magnetic field produced by alternating current used to drive the motor. This way, the motor may receive an uneven torque which exactly compensates for any irregularity in the motor and causes the motor to run smoothly and evenly.
Inventors
- 👤 Kunio Goto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:43
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
159 words
In a system for electrically biasing synchronous electric motors to remove rotational irregularities, the combination comprising a synchronous motor having a rotor and a plurality of armature windings, means responsive to an alternating current in said armature windings for producing a revolving magnetic field to produce a revolution of said rotor, means for supplying a direct current bias to said armature windings, and means for selecting a value and polarity of the direct current for producing a resultant magnetic field arising from a combination of the stationary magnetic field produced by the dIrect current and said revolving magnetic field produced by the alternating circuit, said resultant field compensating for any inherent irregularity in the revolution of said synchronous motor, wherein the resultant magnetic field is a circular field having its center displaced from the center of rotor revolution by a distance equal and opposite to any unwanted displacement of the mechanical center of rotation which causes said rotational irregularities.
Claim 2
Dependent Claim
159 words
In a system for electrically biasing synchronous electric motors to remove rotational irregularities, the combination comprising a synchronous motor having a rotor and a plurality of armature windings, means responsive to an alternating current in said armature windings for producing a revolving magnetic field to produce a revolution of said rotor, means for supplying a direct current bias to said armature windings, and means for selecting a value and polarity of the direct current for producing a resultant magnetic field arising from a combination of the stationary magnetic field produced by the dIrect current and said revolving magnetic field produced by the alternating circuit, said resultant field compensating for any inherent irregularity in the revolution of said synchronous motor, wherein the resultant magnetic field is a circular field having its center displaced from the center of rotor revolution by a distance equal and opposite to any unwanted displacement of the mechanical center of rotation which causes said rotational irregularities.
Claim 3
Dependent Claim
14 words
The system of claim 1 wherein said synchronous motor is a two-phase synchronous motor.
Claim 4
Dependent Claim
39 words
The system of claim 1 in which said means for producing a revolving magnetic field comprises phase shifter circuit means for varying the phase of output alternating current voltage with respect to the phase of input alternating current voltage.
Claim 5
Dependent Claim
136 words
The system of claim 1 in which said means for producing a revolving magnetic field comprises phase shifter circuit means capable of varying the phase of output alternating current voltage with respect to the phase of input alternating current voltage within a range extending from 0* to 180* , two adjuster means for varying the value of said alternating current voltage, means for applying said alternating current voltage to a first armature winding of one phase through one of said adjuster means and through said phase shifter circuit means, means for applying said alternating current voltage to another armature winding of a second phase through the other of said adjuster means, and means including said adjuster means for selecting the value of alternating current voltage flowing through the armature windings of the first and second phases.
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) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |