US3564313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-compensating tachometer generator
Assignee: TRANS SONICS Inc
•
Filing: 1969-08-08
•
Granted: 1971-02-16
•
Expires: 1989-08-08
Abstract
Abstract A tachometer generator has rotor and stator pole pieces which interfit as they move relative to one another so as to provide at least a pair of relatively low reluctance stator-rotor flux paths parallel to the axis of rotation of the rotor.
Inventors
- 👤 Dan Goor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:59
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/481; G01P3/488
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
146 words
A tachometer generator comprising: A. a rotor: 1. made of material having a high magnetic permeability; 2. mounted for rotation about an axis; and 3. a plurality of pole pieces arranged about said axis; and B. a stator including: 1. a permanent magnet; 2. a stator pole piece positioned opposite the rotor radially outward from the axis thereof, either the rotor pole pieces or the stator pole piece having radial passages for receiving the opposite member so that the rotor and stator pole pieces interfit as they move relative to one another, thereby providing relatively short rotor-stator flux paths generally parallel to the axis so that relatively large changes in the rotor-stator flux from said magnet occur in response to rotation of the rotor; and 3. a winding associated with the stator pole piece and arranged to develop a voltage in response to said flux changes.
Claim 2
Dependent Claim
146 words
A tachometer generator comprising: A. a rotor: 1. made of material having a high magnetic permeability; 2. mounted for rotation about an axis; and 3. a plurality of pole pieces arranged about said axis; and B. a stator including: 1. a permanent magnet; 2. a stator pole piece positioned opposite the rotor radially outward from the axis thereof, either the rotor pole pieces or the stator pole piece having radial passages for receiving the opposite member so that the rotor and stator pole pieces interfit as they move relative to one another, thereby providing relatively short rotor-stator flux paths generally parallel to the axis so that relatively large changes in the rotor-stator flux from said magnet occur in response to rotation of the rotor; and 3. a winding associated with the stator pole piece and arranged to develop a voltage in response to said flux changes.
Claim 3
Dependent Claim
7 words
mounted for rotation about an axis; and
Claim 4
Dependent Claim
7 words
mounted for rotation about an axis; and
Claim 5
Dependent Claim
81 words
a stator pole piece positioned opposite the rotor radially outward from the axis thereof, either the rotor pole pieces or the stator pole piece having radial passages for receiving the opposite member so that the rotor and stator pole pieces interfit as they move relative to one another, thereby providing relatively short rotor-stator flux paths generally parallel to the axis so that relatively large changes in the rotor-stator flux from said magnet occur in response to rotation of the rotor; and
Claim 6
Dependent Claim
81 words
a stator pole piece positioned opposite the rotor radially outward from the axis thereof, either the rotor pole pieces or the stator pole piece having radial passages for receiving the opposite member so that the rotor and stator pole pieces interfit as they move relative to one another, thereby providing relatively short rotor-stator flux paths generally parallel to the axis so that relatively large changes in the rotor-stator flux from said magnet occur in response to rotation of the rotor; and
Claim 7
Dependent Claim
30 words
A tachometer generator as defined in claim 1 wherein each stator pole piece has a notch at its end through which the rotor pole pieces pass as the rotor turns.
Claim 8
Dependent Claim
20 words
a winding associated with the stator pole piece and arranged to develop a voltage in response to said flux changes.
Claim 9
Dependent Claim
20 words
a winding associated with the stator pole piece and arranged to develop a voltage in response to said flux changes.
Claim 10
Dependent Claim
14 words
a plurality of pole pieces arranged about said axis; and B. a stator including:
Claim 11
Dependent Claim
14 words
a plurality of pole pieces arranged about said axis; and B. a stator including:
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |