US4450399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction motor
Assignee: Sanyo Electric Co Ltd
•
Filing: 1982-05-28
•
Granted: 1984-05-22
•
Expires: 2002-05-28
Abstract
Abstract An induction motor comprises a main winding (41) and an auxiliary winding (42) wound in slots of a stator with proper intervals, the main winding (41) and the auxiliary winding (42) being connected to an alternating current voltage source (1) through a conduction control circuit (20). A control winding (9) is electromagnetically coupled to the main winding (41), with the same shunted by a capacitor (10) so that a closed loop may be formed.
Inventors
- 👤 Masaru Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:24
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/04
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
104 words
An induction motor adapted to be energized by an alternating current voltage source for supplying an alternating current voltage, said induction motor comprising: conduction control means for controlling conduction of said alternating current voltage to said motor, said conduction control means repetitively interrupting said alternating current voltage thereby changing the effective voltage of said alternating current voltage; a field winding coupled to said alternating current voltage source through said conduction control means, a control winding electromagnetically coupled to said field winding, and closed loop means coupled to said control winding constituting a closed loop therewith for generating an induced current in said control winding.
Claim 2
Dependent Claim
104 words
An induction motor adapted to be energized by an alternating current voltage source for supplying an alternating current voltage, said induction motor comprising: conduction control means for controlling conduction of said alternating current voltage to said motor, said conduction control means repetitively interrupting said alternating current voltage thereby changing the effective voltage of said alternating current voltage; a field winding coupled to said alternating current voltage source through said conduction control means, a control winding electromagnetically coupled to said field winding, and closed loop means coupled to said control winding constituting a closed loop therewith for generating an induced current in said control winding.
Claim 3
Dependent Claim
25 words
An induction motor in accordance with claim 1, wherein said conduction control means comprises means for changing the conduction phase of said alternating current voltage.
Claim 4
Dependent Claim
29 words
An induction motor in accordance with claim 1, wherein said conduction control means comprises chopper means for chopping said alternating current voltage for application thereof to said field winding.
Claim 5
Dependent Claim
26 words
An induction motor in accordance with claim 1, wherein said closed loop means comprises impedance means interposed in said closed loop and having a predetermined impedance.
Claim 6
Dependent Claim
15 words
An induction motor in accordance with claim 4, wherein said impedance means comprises capacitor means.
Claim 7
Dependent Claim
15 words
An induction motor in accordance with claim 4, wherein said impedance means comprises resistor means.
Claim 8
Dependent Claim
21 words
An induction motor in accordance with claim 4, wherein said impedance means is selected to have an impedance of substantially zero.
Claim 9
Dependent Claim
33 words
An induction motor in accordance with any of the preceding claims 1 to 7, wherein said field winding comprises a main winding, and an auxiliary winding coupled in parallel with said main winding.
Claim 10
Dependent Claim
20 words
An induction motor in accordance with claim 8, which further comprises a capacitor connected in series with said auxiliary winding.
Claim 11
Dependent Claim
28 words
An induction motor in accordance with any one of the preceding claims 1 to 7, which further comprises a shading coil coupled in association with said field winding.
Claim 12
Dependent Claim
55 words
An induction motor in accordance with any of the preceding claims 1 to 7, which further comprises a stator, said stator being formed with a plurality of slots for winding said field winding therein, and wherein said control winding is received in at least one of said plurality of slots together with said field winding.
Claim 13
Dependent Claim
47 words
An induction motor in accordance with claim 11, wherein said field winding comprises a main winding and an auxiliary winding connected in parallel with said main winding, and said control winding is received in at least one of said plurality of slots together with said main winding.
Claim 14
Dependent Claim
100 words
A variable speed induction motor adapted to be energized by an alternating current voltage, said induction motor comprising: conduction control means for controlling conduction of said alternating current voltage to said motor, said conduction control means repetitively interrupting said alternating voltage and thereby changing the effective voltage of said alternating current voltage; a field winding coupled to said alternating current voltage source through said conduction control means; and magnetic flux distortion reducing means electromagnetically coupled to said field winding for reducing magnetic flux distortion resulting from said repetitive interruption of said alternating voltage, thereby reducing noise generated by said motor.
Claim 15
Dependent Claim
100 words
A variable speed induction motor adapted to be energized by an alternating current voltage, said induction motor comprising: conduction control means for controlling conduction of said alternating current voltage to said motor, said conduction control means repetitively interrupting said alternating voltage and thereby changing the effective voltage of said alternating current voltage; a field winding coupled to said alternating current voltage source through said conduction control means; and magnetic flux distortion reducing means electromagnetically coupled to said field winding for reducing magnetic flux distortion resulting from said repetitive interruption of said alternating voltage, thereby reducing noise generated by said motor.
Claim 16
Dependent Claim
44 words
The motor according to claim 13 wherein said magnetic flux distortion means comprises: control winding electromagnetically coupled to said field winding; and closed loop means coupled to said control winding forming a closed loop therewith for generating on induced current in said control winding.
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) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |