US3596159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control circuit for a single-phase motor,using a thyristor
Assignee: Janome Corp
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Filing: 1969-03-20
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Granted: 1971-07-27
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Expires: 1989-03-20
Abstract
Abstract The present motor speed control circuit uses a thyristor and a single phase of the ignition circuit is automatically changed in response to changes in the speed of the motor due to load changes thereby stabilizing the speed of the motor to a given speed.
Inventors
- 👤 Kenzi Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:35
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
212 words
A speed control circuit for a single phase motor using a thyristor comprising a main circuit including terminals for an alternating power source, terminals for said motor and said thyristor for ignition; an ignition circuit including a reactance element and ignition means connected to respond when the potential of said reactance element reaches a predetermined level; and means connected to said ignition means, which applies a switching pulse, upon response of said ignition means, to said thyristor to control the conduction thereof, said circuit for charging said reactance element including a full-wave rectifier circuit, the input terminal of which is connected in series to a charging path for said reactance element, a transistor having its emitter and collector connected across the output terminal of said full-wave rectifier circuit, a reference voltage circuit having its input terminal connected across said output terminal of said full-wave rectifier circuit and including resistor means, and means connected between the output terminal of said reference voltage circuit and the base of said transistor and detecting the motor speed to draw out a given feedback voltage, whereby adjustment of the motor-controlling voltage will be possible to change the current at the base of said transistor by means of a difference between said reference voltage and said feedback voltage.
Claim 2
Dependent Claim
212 words
A speed control circuit for a single phase motor using a thyristor comprising a main circuit including terminals for an alternating power source, terminals for said motor and said thyristor for ignition; an ignition circuit including a reactance element and ignition means connected to respond when the potential of said reactance element reaches a predetermined level; and means connected to said ignition means, which applies a switching pulse, upon response of said ignition means, to said thyristor to control the conduction thereof, said circuit for charging said reactance element including a full-wave rectifier circuit, the input terminal of which is connected in series to a charging path for said reactance element, a transistor having its emitter and collector connected across the output terminal of said full-wave rectifier circuit, a reference voltage circuit having its input terminal connected across said output terminal of said full-wave rectifier circuit and including resistor means, and means connected between the output terminal of said reference voltage circuit and the base of said transistor and detecting the motor speed to draw out a given feedback voltage, whereby adjustment of the motor-controlling voltage will be possible to change the current at the base of said transistor by means of a difference between said reference voltage and said feedback voltage.
Claim 3
Dependent Claim
59 words
A speed control circuit for a single-phase motor, using a thyristor as described in claim 1, including a symmetrical semiconductor switching element for the main circuit, a secondary winding of the pulse transformer and a motor connected in series, said main circuit being connected in parallel to said series circuit including said full-wave rectifying circuit and said reactance element.
Claim 4
Dependent Claim
82 words
A speed control circuit for a single-phase motor, using a thyristor as described in claim 1, including a series circuit of resistors connected in parallel to said series circuit including said full-wave rectifying circuit and said reactance element, a series circuit composed of a symmetrical semiconductor switching element for ignition, a primary winding of pulse transformer and capacitor, and connected between a juncture between said resistors and a juncture between said input terminal of said full-wave rectifying circuit and said reactance element.
Claim 5
Dependent Claim
37 words
A speed control circuit for a single phase motor, uSing a thyristor as described in claim 1 wherein said resistor of said reference voltage circuit has a given point, by which to take out a reference voltage.
Claim 6
Dependent Claim
53 words
A speed control circuit for a single-phase motor, using a thyristor as described in claim 1, including a resistor and a plurality of diodes connected in series between said terminals on the DC side of said full-wave rectifying circuit so as to utilize the forward voltage drop of said diodes as reference voltage.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |