US3654540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetostrictive drive circuit feedback coil
Assignee: Cavitron Corp
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Filing: 1971-01-15
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Granted: 1972-04-04
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Expires: 1991-01-15
Abstract
Abstract A feedback coil is placed in surrounding relation to a magnetostrictive member which is vibrating under the influence of a drive coil being energized by a power amplifier. Ideally, the voltage induced in the feedback coil should be proportional only to the vibrational amplitude of the magnetostrictive member. The induced voltage is fed back to the input of the power amplifier insuring that the member is vibrating at one of its resonant frequencies. The feedback coil is designed so that there is no transformer coupling between the feedback and drive coils. The feedback coil can be positioned along the length of the device in one of two ways, so as to maximize the induced voltage. Each way relies on a different magnetostrictive effect.
Inventors
- 👤 William M Honig
- 👤 Richard H Paschke
- 👤 Jacob Haggag
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:33
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/0207; B06B1/0223; B06B1/0238; B06B1/0246; B06B1/0261; B06B2201/00; B06B2201/50; B06B2201/58
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
162 words
An electro-mechanical resonant system comprising a work performing, variably loaded mechanical part including a magnetostrictive member and having a drive coil in surrounding relation thereto, a power circuit operative to supply alternating current to said drive coil so that the latter establishes an alternating electromagnetic field which sets up compressional waves in said magnetostrictive member at a resonant frequency of said mechanical part, a pickup coil in surrounding relation to the magnetostrictive member so that a voltage is induced in said pickup coil directly related tO the actual frequency of the compressional waves, said pickup coil having two portions each with an equal number of winding, with the first portion being wound in a clockwise direction about the magnetostrictive member and the second portion being wound in a counterclockwise direction about the magnetostrictive member, and a circuit means connecting said pickup coil to said power circuit so that the power supplied to said drive coil is controlled by said alternating feedback voltage.
Claim 2
Dependent Claim
162 words
An electro-mechanical resonant system comprising a work performing, variably loaded mechanical part including a magnetostrictive member and having a drive coil in surrounding relation thereto, a power circuit operative to supply alternating current to said drive coil so that the latter establishes an alternating electromagnetic field which sets up compressional waves in said magnetostrictive member at a resonant frequency of said mechanical part, a pickup coil in surrounding relation to the magnetostrictive member so that a voltage is induced in said pickup coil directly related tO the actual frequency of the compressional waves, said pickup coil having two portions each with an equal number of winding, with the first portion being wound in a clockwise direction about the magnetostrictive member and the second portion being wound in a counterclockwise direction about the magnetostrictive member, and a circuit means connecting said pickup coil to said power circuit so that the power supplied to said drive coil is controlled by said alternating feedback voltage.
Claim 3
Dependent Claim
122 words
A pickup coil for use with a magnetostrictive member being vibrated by a drive coil energized by a power circuit, wherein said pickup coil is in surrounding relation to the magnetostrictive member whereby a voltage is induced in said pickup coil directly related to the actual frequency of vibration of the magnetostrictive member, said pickup coil includes two portions, each with an equal number of windings, with the first portion being wound in a clockwise direction about the magnetostrictive member and the second portion being wound in a counterclockwise direction about the magnetostrictive member, and a circuit means connects said pickup coil to the power circuit so that the power supplied to the drive coil is controlled by the induced feedback voltage.
Claim 4
Dependent Claim
122 words
A pickup coil for use with a magnetostrictive member being vibrated by a drive coil energized by a power circuit, wherein said pickup coil is in surrounding relation to the magnetostrictive member whereby a voltage is induced in said pickup coil directly related to the actual frequency of vibration of the magnetostrictive member, said pickup coil includes two portions, each with an equal number of windings, with the first portion being wound in a clockwise direction about the magnetostrictive member and the second portion being wound in a counterclockwise direction about the magnetostrictive member, and a circuit means connects said pickup coil to the power circuit so that the power supplied to the drive coil is controlled by the induced feedback voltage.
Claim 5
Dependent Claim
177 words
An electro-mechanical resonant system comprising a work performing, variably loading mechanical part including a magnetostrictive member having a longitudinal axis and having a drive coil in surrounding relation thereto, a power circuit operative to supply alternating current to said drive coil so that the latter establishes an alternating electromagnetic field which sets up longitudinal compressional waves in said magnetostrictive member at a resonant frequency of said mechanical part, a pickup coil in surrounding relation to the magnetostrictive member so that a voltage is induced in said pickup coil directly related to the actual frequency of the compressional waves, said pickup coil having two portions, each with an equal number of windings, with the first portion being wound in a clockwise direction about the magnetostrictive member, the second portion being wound in a counterclockwise direction about the magnetostrictive member and the reversal point positioned at a node of longitudinal motion, and a circuit means connecting said pickup coil to said power circuit so that the power supplied to said drive coil is controlled by said alternating feedback voltage.
Claim 6
Dependent Claim
177 words
An electro-mechanical resonant system comprising a work performing, variably loading mechanical part including a magnetostrictive member having a longitudinal axis and having a drive coil in surrounding relation thereto, a power circuit operative to supply alternating current to said drive coil so that the latter establishes an alternating electromagnetic field which sets up longitudinal compressional waves in said magnetostrictive member at a resonant frequency of said mechanical part, a pickup coil in surrounding relation to the magnetostrictive member so that a voltage is induced in said pickup coil directly related to the actual frequency of the compressional waves, said pickup coil having two portions, each with an equal number of windings, with the first portion being wound in a clockwise direction about the magnetostrictive member, the second portion being wound in a counterclockwise direction about the magnetostrictive member and the reversal point positioned at a node of longitudinal motion, and a circuit means connecting said pickup coil to said power circuit so that the power supplied to said drive coil is controlled by said alternating feedback voltage.
Claim 7
Dependent Claim
138 words
A pickup coil for use with a magnetostrictive member having a longitudinal axis and being vibrated by a drive coil energized by a power circuit, wherein said pickup coil is in surrounding relation to the magnetostrictive member whereby a voltage is induced in said pickup coil directly related to the actual frequency of vibration of the magnetostrictive member, said pickup coil includes two portions, each with an equal number of windings, with the first portion being wound in a clockwise direction about the magnetostrictive member, the second portion being wound in a counterclockwise direction about the magnetostrictive member and the reversal point being positioned at a node of longitudinal motion, and a circuit means connects said pickup coil to the power circuit so that the power supplied to the drive coil is controlled by the induced feedback voltage.
Claim 8
Dependent Claim
138 words
A pickup coil for use with a magnetostrictive member having a longitudinal axis and being vibrated by a drive coil energized by a power circuit, wherein said pickup coil is in surrounding relation to the magnetostrictive member whereby a voltage is induced in said pickup coil directly related to the actual frequency of vibration of the magnetostrictive member, said pickup coil includes two portions, each with an equal number of windings, with the first portion being wound in a clockwise direction about the magnetostrictive member, the second portion being wound in a counterclockwise direction about the magnetostrictive member and the reversal point being positioned at a node of longitudinal motion, and a circuit means connects said pickup coil to the power circuit so that the power supplied to the drive coil is controlled by the induced feedback voltage.
Claim 9
Dependent Claim
189 words
An electro-mechanical resonant system comprising a work performing, variably loaded mechanical part including a polarized magnetostrictive member having a longitudinal axis and having a drive coil in surrounding relation thereto, a power circuit operative to supply alternating current to said drive coil so that the latter establishes an alternating electromagnetic field which sets up longitudinal compressional waves in said magnetostrictive member at a resonant frequency of said mechanical part, a pickup coil in surrounding relation to the magnetostrictive member so that a voltage is induced in said pickup coil directly related to the actual frequency of the compressional waves, said pickup coil having two portions, each with an equal number of windings, with the first portion being wound in a clockwise direction about the magnetostrictive member, the second portion being wound in a counterclockwise direction about the magnetostrictive member and a node of longitudinal motion of said member approximately at the center of one of the portions of the pickup coil, and a circuit means connecting said pickup coil to said power circuit so that the power supplied to said drive coil is controlled by said alternating feedback voltage.
Claim 10
Dependent Claim
189 words
An electro-mechanical resonant system comprising a work performing, variably loaded mechanical part including a polarized magnetostrictive member having a longitudinal axis and having a drive coil in surrounding relation thereto, a power circuit operative to supply alternating current to said drive coil so that the latter establishes an alternating electromagnetic field which sets up longitudinal compressional waves in said magnetostrictive member at a resonant frequency of said mechanical part, a pickup coil in surrounding relation to the magnetostrictive member so that a voltage is induced in said pickup coil directly related to the actual frequency of the compressional waves, said pickup coil having two portions, each with an equal number of windings, with the first portion being wound in a clockwise direction about the magnetostrictive member, the second portion being wound in a counterclockwise direction about the magnetostrictive member and a node of longitudinal motion of said member approximately at the center of one of the portions of the pickup coil, and a circuit means connecting said pickup coil to said power circuit so that the power supplied to said drive coil is controlled by said alternating feedback voltage.
Claim 11
Dependent Claim
149 words
A pickup coil for use with a polarized magnetostrictive member having a longitudinal axis and being vibrated by a drive coil energized by a power circuit, wherein said pickup coil is in surrounding relation to the magnetostrictive member whereby a voltage is induced in said pickup coil directly related to the actual frequency of vibration of the magnetostrictive member, said pickup coil includes two portions, each with an equal number of windings, with the first portion being wound in a clockwise direction about the magnetostrictive member, the second portion being wound in a counterclockwise direction about the magnetostrictive member and a node of longitudinal motion of said member approximately at the center of one of the portions of the pickup coil, and a circuit means connects said pickup coil to the power circuit so that the power supplied to the drive coil is controlled by the induced feedback voltage.
Claim 12
Dependent Claim
149 words
A pickup coil for use with a polarized magnetostrictive member having a longitudinal axis and being vibrated by a drive coil energized by a power circuit, wherein said pickup coil is in surrounding relation to the magnetostrictive member whereby a voltage is induced in said pickup coil directly related to the actual frequency of vibration of the magnetostrictive member, said pickup coil includes two portions, each with an equal number of windings, with the first portion being wound in a clockwise direction about the magnetostrictive member, the second portion being wound in a counterclockwise direction about the magnetostrictive member and a node of longitudinal motion of said member approximately at the center of one of the portions of the pickup coil, and a circuit means connects said pickup coil to the power circuit so that the power supplied to the drive coil is controlled by the induced feedback voltage.
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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) | 1975-04-04 | 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 |