US3855510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High stability multiple speed motor power supply for facsimile
Assignee: INT SCANATRON SYST CORP
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Filing: 1973-02-15
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Granted: 1974-12-17
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Expires: 1993-02-15
Abstract
Abstract A high stability motor drive for the scanning or recording motor and the paper advance motor is provided using a high stability crystal oscillator frequency divided to the appropriate frequency for driving the motors and phase splitting to provide a two-phase power source for two-phase motors. Logic circuits perform most of the functions involved. Switched logic circuits provide for predetermined changes in motor drive power frequency to provide a variety of predetermined motor speeds for either the scanning or recording motors and the paper advance motor. Provision is also made for automatically changing the power supply voltage in accordance with the requirements at different motor speeds.
Inventors
- 👤 D Houck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:54
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/022; H02P25/024
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
109 words
In a synchronous motor drive system, the combination of; a synchronous two phase motor including two sets of windings, one for each phase; a crystal controlled high frequency oscillator; means for dividing the frequency of said oscillator down to predetermined lower frequency signals; means for providing two phase symmetrical bidirectional pulses at a predetermined rate phased 90 degrees apart from said lower frequency signals; logic and motor power control means directly coupled between said latter means and the windings of said motor for applying power determined by said pulses to said two phase windings of said motor for rotating said motor in a predetermined direction at a predetermined speed.
Claim 2
Dependent Claim
109 words
In a synchronous motor drive system, the combination of; a synchronous two phase motor including two sets of windings, one for each phase; a crystal controlled high frequency oscillator; means for dividing the frequency of said oscillator down to predetermined lower frequency signals; means for providing two phase symmetrical bidirectional pulses at a predetermined rate phased 90 degrees apart from said lower frequency signals; logic and motor power control means directly coupled between said latter means and the windings of said motor for applying power determined by said pulses to said two phase windings of said motor for rotating said motor in a predetermined direction at a predetermined speed.
Claim 3
Dependent Claim
41 words
A two phase motor drive circuit as set forth in claim 1, and including; means for providing said pulses with spacing intervals of zero voltage between positive and negative excursions for reducing transients in said motor windings due to pulse excitation.
Claim 4
Dependent Claim
40 words
A two phase motor drive circuit as set forth in claim 1, and including; means for lowerIng the frequency of said low frequency signals; and means for changing the power to said motor power in accordance with said lowered frequency.
References Cited (Backward Citations)
US3416057A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |