Patent US3667013A successfully refreshed from Google Patents.
US3667013A
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Hysteresis motor control circuit apparatus
Assignee: Honeywell Inc
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Filing: 1970-09-25
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Granted: 1972-05-30
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Expires: 1990-09-25
Abstract
Abstract A power supply for use with hysteresis motors to provide a low power mode of operation. A current detector measures the level of current in hysteresis motor windings. The detector drives an oscillator which controls the voltage applied to the motor to maintain permanent magnetization of the rotor.
Inventors
- 👤 Robert E Bicking
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:02
CPC Classifications
G; G05; G05F; G05F7/00; H; H02; H02K; H02K19/00; H02K19/02; H02K19/04; H02K19/08; H02P; H02P7/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
153 words
Apparatus for controlling hysteresis motor rotor magnetization comprising: a. a current level detector for detecting the magnetization state of motor rotor elements during motor operation and providing an output indicative of the magnetization state; b. an oscillator, having an input and an output, connected to said detector, and responsive thereto to generate pulses at the oscillator output whenever the detector output indicates demagnetization; c. a dual voltage switch, connected to said oscillator output and responsive thereto to provide a first DC voltage at its output whenever no oscillator pulses are received, and a second, larger DC voltage when oscillator pulses are received; and d. motor control means, connected to the dual voltage switch output and operable to generate at the motor control means output an AC signal whose amplitude is dependent upon the DC voltage input, whereby the magnetization state of a hysteresis motor connected to the control means output may be controlled.
Claim 2
Dependent Claim
153 words
Apparatus for controlling hysteresis motor rotor magnetization comprising: a. a current level detector for detecting the magnetization state of motor rotor elements during motor operation and providing an output indicative of the magnetization state; b. an oscillator, having an input and an output, connected to said detector, and responsive thereto to generate pulses at the oscillator output whenever the detector output indicates demagnetization; c. a dual voltage switch, connected to said oscillator output and responsive thereto to provide a first DC voltage at its output whenever no oscillator pulses are received, and a second, larger DC voltage when oscillator pulses are received; and d. motor control means, connected to the dual voltage switch output and operable to generate at the motor control means output an AC signal whose amplitude is dependent upon the DC voltage input, whereby the magnetization state of a hysteresis motor connected to the control means output may be controlled.
Claim 3
Dependent Claim
37 words
The apparatus of claim 1 wherein the dual voltage switch provides gradual switching between said first and second DC voltage, thereby limiting the inductive surge of a hysteresis motor connected to the control means output during switching.
Claim 4
Dependent Claim
28 words
The apparatus of claim 2 wherein said dual voltage switch includes a transistor having a base connected to the parallel combination of a zener diode and a capacitor.
Claim 5
Dependent Claim
129 words
The apparatus of claim 2 wherein said current level detector comprises: a. a current sensing resistor adapted to receive motor coil currents; b. a first voltage level detector connected to monitor the voltage across said current sensing resistor and provide a logic signal at its output whenever the monitored voltage falls below a predetermined level; c. a second voltage level detector connected to monitor the voltage across said current sensing resistor and to provide at its output a logic signal whenever the voltage monitored by said second detector is above a predetermined level; and d. a logic gate connected to said first and second current level detectors and providing a logic signal at the logic gate output whenever one of said detectors has a logic signal at its output.
References Cited (Backward Citations)
US3463986A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |