US3654536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for stopping a single phase wound commutator motor at a fixed position
Assignee: Janome Corp
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Filing: 1968-06-18
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Granted: 1972-04-04
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Expires: 1988-06-18
Abstract
Abstract In a phase control system of a motor using a semiconductor switching element such as a symmetrical semiconductor switching element or a semiconductor commutating control element, a series circuit of two switches is provided between a trigger circuit and a predetermined point of a resistor connected in parallel to a main circuit. A first switch will become ON when the current flowing to the motor is stopped, and a second switch is in the form of a drum by the motor so as to be made OFF at every rotation of the same. Thus, the motor is re-rotated at a low speed when the first switch becomes ON, and the motor is stopped at a predetermined position when the second switch is made OFF.
Inventors
- 👤 Ataka Miura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:02
CPC Classifications
D; D05; D05B; D05B69/00; D05B69/22; D05B69/26
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
188 words
A system for stopping a single phase series wound commutator motor at a fixed position, comprising a main circuit having a motor and a semiconductor switching element, a trigger circuit connected in parallel to the main circuit to regulate the conduction of said semiconductor switching element, a resistance adjusting circuit connected in parallel to said main circuit and including a resistor and a wiper, and a series circuit of first and second switches connected in parallel to said resistance adjusting circuit, the series circuit being at one end connected to a selected point of said resistor where the resistance value is determined so as to drive the motor at a low speed through said trigger circuit and the semiconductor switching element, the first switch being connected to said wiper and normally closed, and being open when said wiper becomes OFF from said resistor to re-rotate the motor, and the second switch being in the form of a drum driven by the motor and having conductive and nonconductive portions so that said second switch will become open at every rotation thereof to determine the stop position of the motor.
Claim 2
Independent Claim
188 words
A system for stopping a single phase series wound commutator motor at a fixed position, comprising a main circuit having a motor and a semiconductor switching element, a trigger circuit connected in parallel to the main circuit to regulate the conduction of said semiconductor switching element, a resistance adjusting circuit connected in parallel to said main circuit and including a resistor and a wiper, and a series circuit of first and second switches connected in parallel to said resistance adjusting circuit, the series circuit being at one end connected to a selected point of said resistor where the resistance value is determined so as to drive the motor at a low speed through said trigger circuit and the semiconductor switching element, the first switch being connected to said wiper and normally closed, and being open when said wiper becomes OFF from said resistor to re-rotate the motor, and the second switch being in the form of a drum driven by the motor and having conductive and nonconductive portions so that said second switch will become open at every rotation thereof to determine the stop position of the motor.
Claim 3
Dependent Claim
30 words
A system for stopping a single phase series wound commutator motor at a fixed position as recited in claim 1, said semiconductor switching element being a symmetrical semiconductor switching element.
Claim 4
Dependent Claim
30 words
A system for stopping a single phase series wound commutator motor at a fixed position as described in claim 1, said semiconductor switching element being a semiconductor commutating control element.
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) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |