US3676765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tachometer generator
Assignee: TRANS SONICS Inc
•
Filing: 1970-06-30
•
Granted: 1972-07-11
•
Expires: 1990-06-30
Abstract
Abstract A tachometer generator for use in a high noise environment comprises a multi-pole rotor of magnetic material and a singlepole stator. The stator includes a magnet arranged to pass flux through the stator and into the rotor, and a coil that develops a voltage in response to changes in the stator flux. Movement of the rotor poles past the stator provides changes in reluctance that are reflected in changes in the stator flux. The coil thereby develops a signal whose frequency is proportional to the rotational speed of the rotor. This signal is applied to a signal-conditioning amplifier housed with the stator. The amplifier has a high gain and hysteresis, which combine to provide a square wave output having a large amplitude and substantially immune to noise picked up by the generator.
Inventors
- 👤 Vernon C Westcott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:06
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/4802; G01P3/481; G01P3/488
Claims Analysis
Total Claims: 54
Claim 1
Independent Claim
228 words
A tachometer generator comprising A. a rotor 1. fixed to a rotating member for rotation therewith, and 2. having a plurality of poles extending therefrom, B. A stator including 1. a core of high permeability material, 2. a pole piece extending from said core toward said rotor poles, 3. a magnet arranged to pass a magnetic field between said stator pole piece and said rotor poles by way of said core, and 4. a coil positioned to sense changes in the magnetic flux in said core, whereby said coil develops a speed-indicating signal corresponding to the changes in magnetic flux in said core resulting from movement of said rotor poles past said stator pole piece, C. a signal conditioning unit 1. deriving its input from said coil, 2. providing a high gain for said speed-indicating signal, 3. having first and second output voltage levels, a. developing said first output level in response to an input voltage in excess of a first threshold level, b. developing said second output level in response to a second input threshold level substantially different from said first threshold level, thereby to provide a hysteresis effect in switching between said output levels, 4. whereby said signal conditioning unit provides an output for said tachometer generator having a substantial amplitude and largely free of the effects of noise in the input to said conditioning unit.
Claim 2
Dependent Claim
228 words
A tachometer generator comprising A. a rotor 1. fixed to a rotating member for rotation therewith, and 2. having a plurality of poles extending therefrom, B. A stator including 1. a core of high permeability material, 2. a pole piece extending from said core toward said rotor poles, 3. a magnet arranged to pass a magnetic field between said stator pole piece and said rotor poles by way of said core, and 4. a coil positioned to sense changes in the magnetic flux in said core, whereby said coil develops a speed-indicating signal corresponding to the changes in magnetic flux in said core resulting from movement of said rotor poles past said stator pole piece, C. a signal conditioning unit 1. deriving its input from said coil, 2. providing a high gain for said speed-indicating signal, 3. having first and second output voltage levels, a. developing said first output level in response to an input voltage in excess of a first threshold level, b. developing said second output level in response to a second input threshold level substantially different from said first threshold level, thereby to provide a hysteresis effect in switching between said output levels, 4. whereby said signal conditioning unit provides an output for said tachometer generator having a substantial amplitude and largely free of the effects of noise in the input to said conditioning unit.
Claim 3
Dependent Claim
11 words
having a plurality of poles extending therefrom, B. a stator including
Claim 4
Dependent Claim
11 words
having a plurality of poles extending therefrom, B. a stator including
Claim 5
Dependent Claim
25 words
a coil positioned to sense changes in the magnetic flux resulting from movement of said rotor poles past said stator, C. a signal conditioning unit
Claim 6
Dependent Claim
25 words
a coil positioned to sense changes in the magnetic flux resulting from movement of said rotor poles past said stator, C. a signal conditioning unit
Claim 7
Dependent Claim
39 words
a coil poSitioned to sense changes in the magnetic flux, whereby said coil develops a speed-indicating signal corresponding to the changes in magnetic flux resulting from movement of said rotor poles past said stator, C. a signal conditioning unit
Claim 8
Dependent Claim
39 words
a coil poSitioned to sense changes in the magnetic flux, whereby said coil develops a speed-indicating signal corresponding to the changes in magnetic flux resulting from movement of said rotor poles past said stator, C. a signal conditioning unit
Claim 9
Dependent Claim
8 words
providing a high gain for said speed-indicating signal,
Claim 10
Dependent Claim
8 words
providing a high gain for said speed-indicating signal,
Claim 11
Dependent Claim
11 words
having a plurality of poles extending therefrom, B. A stator including
Claim 12
Dependent Claim
11 words
having a plurality of poles extending therefrom, B. A stator including
Claim 13
Dependent Claim
11 words
a pole piece extending from said core toward said rotor poles,
Claim 14
Dependent Claim
11 words
a pole piece extending from said core toward said rotor poles,
Claim 15
Dependent Claim
8 words
providing a high gain for said speed-indicating signal,
Claim 16
Dependent Claim
8 words
providing a high gain for said speed-indicating signal,
Claim 17
Dependent Claim
19 words
The generator defined in claim 1 including a housing containing A. said stator, and B. said signal conditioning unit.
Claim 18
Dependent Claim
6 words
positioned proximate to said stator, and
Claim 19
Dependent Claim
6 words
positioned proximate to said stator, and
Claim 20
Dependent Claim
11 words
having a plurality of poles extending therefrom, B. a stator including
Claim 21
Dependent Claim
11 words
having a plurality of poles extending therefrom, B. a stator including
Claim 22
Dependent Claim
6 words
positioned proximate to said stator, and
Claim 23
Dependent Claim
6 words
positioned proximate to said stator, and
Claim 24
Dependent Claim
11 words
a pole piece extending from said core toward said rotor poles,
Claim 25
Dependent Claim
11 words
a pole piece extending from said core toward said rotor poles,
Claim 26
Dependent Claim
11 words
having a plurality of poles extending therefrom, B. a stator including
Claim 27
Dependent Claim
11 words
having a plurality of poles extending therefrom, B. a stator including
Claim 28
Dependent Claim
59 words
having first and second output voltage levels, a. developing said first output level in response to an input voltage in excess of a first threshold level, b. developing said second output level in response to a second input threshold level substantially different from said first threshold level, thereby to provide a hysteresis effect in switching between said output levels,
Claim 29
Dependent Claim
59 words
having first and second output voltage levels, a. developing said first output level in response to an input voltage in excess of a first threshold level, b. developing said second output level in response to a second input threshold level substantially different from said first threshold level, thereby to provide a hysteresis effect in switching between said output levels,
Claim 30
Dependent Claim
59 words
having first and second output voltage levels, a. developing said first output level in response to an input voltage in excess of a first threshold level, b. developing said second output level in response to a second input threshold level substantially different from said first threshold level, thereby to provide a hysteresis effect in switching between said output levels,
Claim 31
Dependent Claim
59 words
having first and second output voltage levels, a. developing said first output level in response to an input voltage in excess of a first threshold level, b. developing said second output level in response to a second input threshold level substantially different from said first threshold level, thereby to provide a hysteresis effect in switching between said output levels,
Claim 32
Dependent Claim
32 words
having first and second output levels and a substantial degree of hysteresis in switching between said output levels, thereby to minimize the effect of noise on the output of said conditioning unit.
Claim 33
Dependent Claim
32 words
having first and second output levels and a substantial degree of hysteresis in switching between said output levels, thereby to minimize the effect of noise on the output of said conditioning unit.
Claim 34
Dependent Claim
7 words
A tachometer generator comprising: A. a rotor
Claim 35
Dependent Claim
7 words
A tachometer generator comprising: A. a rotor
Claim 36
Dependent Claim
23 words
a magnet arranged to pass a magnetic field between said stator pole piece and said rotor poles by way of said core, and
Claim 37
Dependent Claim
23 words
a magnet arranged to pass a magnetic field between said stator pole piece and said rotor poles by way of said core, and
Claim 38
Dependent Claim
23 words
a magnet arranged to pass a magnetic field between said stator pole piece and said rotor poles by way of said core, and
Claim 39
Dependent Claim
23 words
a magnet arranged to pass a magnetic field between said stator pole piece and said rotor poles by way of said core, and
Claim 40
Dependent Claim
31 words
having first and second output levels and a substantial degree of hysteresis in switching between said output levels, thereby to minimize the effect of noise on the output of conditioning unit.
Claim 41
Dependent Claim
31 words
having first and second output levels and a substantial degree of hysteresis in switching between said output levels, thereby to minimize the effect of noise on the output of conditioning unit.
Claim 42
Dependent Claim
47 words
a coil positioned to sense changes in the magnetic flux in said core, whereby said coil develops a speed-indicating signal corresponding to the changes in magnetic flux in said core resulting from movement of said rotor poles past said stator pole piece, C. a signal conditioning unit
Claim 43
Dependent Claim
47 words
a coil positioned to sense changes in the magnetic flux in said core, whereby said coil develops a speed-indicating signal corresponding to the changes in magnetic flux in said core resulting from movement of said rotor poles past said stator pole piece, C. a signal conditioning unit
Claim 44
Dependent Claim
31 words
whereby said signal conditioning unit provides an output for said tachometer generator having a substantial amplitude and largely free of the effects of noise in the input to said conditioning unit.
Claim 45
Dependent Claim
31 words
whereby said signal conditioning unit provides an output for said tachometer generator having a substantial amplitude and largely free of the effects of noise in the input to said conditioning unit.
Claim 46
Dependent Claim
19 words
The generator defined in claim 3 including a housing containing A. said stator, and B. said signal conditioning unit.
Claim 47
Dependent Claim
47 words
a coil positioned to sense changes in the magnetic flux in said core, whereby said coil develops a speed-indicating signal corresponding to the changes in magnetic flux in said core resulting from movement of said rotor poles past said stator pole piece, C. a signal conditioning unit
Claim 48
Dependent Claim
47 words
a coil positioned to sense changes in the magnetic flux in said core, whereby said coil develops a speed-indicating signal corresponding to the changes in magnetic flux in said core resulting from movement of said rotor poles past said stator pole piece, C. a signal conditioning unit
Claim 49
Dependent Claim
31 words
whereby said signal conditioning unit provides an output for said tachometer generator having a substantial amplitude and largely free of the effects of noise in the input to said conditioning unit.
Claim 50
Dependent Claim
31 words
whereby said signal conditioning unit provides an output for said tachometer generator having a substantial amplitude and largely free of the effects of noise in the input to said conditioning unit.
Claim 51
Dependent Claim
7 words
A tachometer generator comprising A. a rotor
Claim 52
Dependent Claim
7 words
A tachometer generator comprising A. a rotor
Claim 53
Dependent Claim
7 words
A tachometer generator comprising: A. a tachometer
Claim 54
Dependent Claim
7 words
A tachometer generator comprising: A. a tachometer
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |