US3845996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bearing systems
Assignee: Padana AG
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Filing: 1973-03-16
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Granted: 1974-11-05
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Expires: 1993-03-16
Abstract
Abstract A magnetic bearing system for a body comprises electromagnetic coils for exerting magnetic forces on the body. A regulating device whose input is connected to a position sensor is adapted to produce corrective signals responsively to displacement of the body from a desired position. The corrective signals are fed to the coils via a complex impedance comprising two branches of which one contains a capacitor and the other contains a resistor or an inductor or a resistor in parallel with an inductor. Both branches can be in series with the same coil or each may be in series with a respective one of two separate coils which act on the body in the same direction. The complex impedance compensates for the increase in d.c. resistance of the coils as the frequency of the corrective signals increases and thereby enables voltage control to be used instead of current control.
Inventors
- 👤 W Geweke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:14
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/064; F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/044; F16C32/0444; F16C32/0451
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
102 words
In a D.C. controlled magnetic bearing system for a body having electromagnetic means comprising magnetizing coil means for exerting magnetic forces on said body, sensor means for producing error signals responsive to displacement of said body from a predetermined position and regulating means for producing corrective signals for said magnetizing coil means responsively to said error signals: the improvement comprising circuitry having two branches each disposed to conduct said corrective signals from said regulating means to said magnetizing coil means, one of said branches comprising capacitor means and the other of said branches comprising at least one of resistor and inductor means.
Claim 2
Dependent Claim
102 words
In a D.C. controlled magnetic bearing system for a body having electromagnetic means comprising magnetizing coil means for exerting magnetic forces on said body, sensor means for producing error signals responsive to displacement of said body from a predetermined position and regulating means for producing corrective signals for said magnetizing coil means responsively to said error signals: the improvement comprising circuitry having two branches each disposed to conduct said corrective signals from said regulating means to said magnetizing coil means, one of said branches comprising capacitor means and the other of said branches comprising at least one of resistor and inductor means.
Claim 3
Dependent Claim
33 words
A magnetic bearing system according to claim 1 in which said circuitry branches are connected to form a complex impedance in series with said magnetizing coil means, said complex impedance containing a capacitor.
Claim 4
Dependent Claim
53 words
A magnetic bearing system according to claim 1 in which said circuitry branches are connected to form a complex impedance in series with two said magnetizing coil means which are disposed to act on the body in opposite directions and are connected in series with one another, said complex impedance containing a capacitor.
Claim 5
Dependent Claim
72 words
A magnetic bearing system according to claim 1, in which two said magnetizing coil means are disposed to act in the same direction on said body, and in which said branch comprising capacitor means is connected in series with a first of said two magnetizing coil means and said branch comprising at least one of resistor and inductor means is connected in series with a second of said two magnetizing coil means.
Claim 6
Dependent Claim
44 words
A magnetic bearing system according to claim 2, further comprising second magnetizing coil means for exerting forces on said body in a different direction to the first-mentioned magnetic forces and a second complex impedance for conducting corrective signals to said second magnetizing coil means.
Claim 7
Dependent Claim
34 words
A magnetic bearing system according to claim 1, in which said regulating means is adapted to produce corrective signals in the form of voltage signals dependent on the error signals produced by the sensors.
Claim 8
Dependent Claim
26 words
A magnetic bearing system as set forth in claim 1 wherein the other of the branches comprises a parallel circuit of a resistor and an inductor.
Claim 9
Dependent Claim
167 words
In a D.C. controlled magnetic bearing system for a body having electromagnetic means for exerting magnetic forces on said body, sensor means for producing error signals responsive to displacement of said body from a predetermined position and regulating means for producing corrective signals for said electromagnetic means responsively to said error signals: the improvement comprising a first pair of electromagnetic means are disposed to act on the body in opposite directions and connected in series with one another, circuitry having two branches each disposed to conduct said corrective signals from said regulating means to said first pair of electromagnetic means, one of said branches comprising capacitor means in series circuit with said first pair of electromagnetic means and the other of said branches comprising at least one of resistor and inductor means, a second pair of electromagnetic means disposed to act in opposite directions on said body different from the first-mentioned opposite directions and a further complex impedance connected in series with said two further electromagnetic means.
Claim 10
Dependent Claim
167 words
In a D.C. controlled magnetic bearing system for a body having electromagnetic means for exerting magnetic forces on said body, sensor means for producing error signals responsive to displacement of said body from a predetermined position and regulating means for producing corrective signals for said electromagnetic means responsively to said error signals: the improvement comprising a first pair of electromagnetic means are disposed to act on the body in opposite directions and connected in series with one another, circuitry having two branches each disposed to conduct said corrective signals from said regulating means to said first pair of electromagnetic means, one of said branches comprising capacitor means in series circuit with said first pair of electromagnetic means and the other of said branches comprising at least one of resistor and inductor means, a second pair of electromagnetic means disposed to act in opposite directions on said body different from the first-mentioned opposite directions and a further complex impedance connected in series with said two further electromagnetic means.
Claim 11
Dependent Claim
286 words
In a D.C. controlled magnetic bearing system for a body having electromagnetic means for exertIng magnetic forces on said body, sensor means for producing error signals responsive to displacement of said body from a predetermined position and regulating means for producing corrective signals for said electromagnetic means responsively to said error signals: the improvement comprising circuitry having two branches each disposed to conduct said corrective signals from said regulating means to said electromagnetic means, one of said branches comprising capacitor means and the other of said branches comprising at least one of resistor and inductor means, said electromagnetic means comprising four pairs of said electromagnetic means disposed to act on said body with the two electromagnetic means of each pair acting in the same direction on said body, two said pairs of electromagnetic means disposed opposite one another in relation to the body and acting in opposite directions on the body to be controlled, the other two pairs of electromagnetic means being disposed opposite each other in relation to the body and acting in opposite directions on the body, said opposite directions being different from the first-mentioned opposite directions, one electromagnetic means of one of the two first-mentioned pairs being connected in series with a respective electromagnetic means of the opposite pair and said branch comprising capacitor means and the other electromagnetic means of said one pair being connected in series with the other electromagnetic means of the opposite pair said branch comprising at least one of resistor and inductor means and said other two pairs of electromagnetic means being similarly connected in series with branches of further circuitry, the latter branches comprising further capacitor means and further at least one of resistor and inductor means.
Claim 12
Dependent Claim
286 words
In a D.C. controlled magnetic bearing system for a body having electromagnetic means for exertIng magnetic forces on said body, sensor means for producing error signals responsive to displacement of said body from a predetermined position and regulating means for producing corrective signals for said electromagnetic means responsively to said error signals: the improvement comprising circuitry having two branches each disposed to conduct said corrective signals from said regulating means to said electromagnetic means, one of said branches comprising capacitor means and the other of said branches comprising at least one of resistor and inductor means, said electromagnetic means comprising four pairs of said electromagnetic means disposed to act on said body with the two electromagnetic means of each pair acting in the same direction on said body, two said pairs of electromagnetic means disposed opposite one another in relation to the body and acting in opposite directions on the body to be controlled, the other two pairs of electromagnetic means being disposed opposite each other in relation to the body and acting in opposite directions on the body, said opposite directions being different from the first-mentioned opposite directions, one electromagnetic means of one of the two first-mentioned pairs being connected in series with a respective electromagnetic means of the opposite pair and said branch comprising capacitor means and the other electromagnetic means of said one pair being connected in series with the other electromagnetic means of the opposite pair said branch comprising at least one of resistor and inductor means and said other two pairs of electromagnetic means being similarly connected in series with branches of further circuitry, the latter branches comprising further capacitor means and further at least one of resistor and inductor means.
Claim 13
Dependent Claim
47 words
A magnetic bearing system according to claim 1, in which said circuitry branches are connected to form a complex impedance in series with two said magnetizing coil means which are disposed opposite one another in relation to said body and are connected in parallel with one another.
Claim 14
Dependent Claim
176 words
In a D.C. controlled magnetic bearing system for a body having electromagnetic means for exerting magnetic forces on said body, sensor means for producing error signals responsive to displacement of said body from a predetermined position and regulating means for producing corrective signals for said electromagnetic means responsively to said error signals: the improvement comprising circuitry having two branches each disposed to conduct said corrective signals from said regulating means to said electromagnetic means, one of said branches comprising capacitor means and the other of said branches comprising at least one of resistor and inductor means, said electromagnetic means comprising two pairs of said electromagnetic means disposed opposite to one another in relation to said body, one electromagnetic means of one pair being connected in series with one electromagnetic means of the opposite pair and one of said branches and the other electromagnetic means of said one pair being connected in parallel with the other electromagnetic means of said opposite pair and the resulting parallel circuit being connected in series with the other of said branches.
Claim 15
Dependent Claim
176 words
In a D.C. controlled magnetic bearing system for a body having electromagnetic means for exerting magnetic forces on said body, sensor means for producing error signals responsive to displacement of said body from a predetermined position and regulating means for producing corrective signals for said electromagnetic means responsively to said error signals: the improvement comprising circuitry having two branches each disposed to conduct said corrective signals from said regulating means to said electromagnetic means, one of said branches comprising capacitor means and the other of said branches comprising at least one of resistor and inductor means, said electromagnetic means comprising two pairs of said electromagnetic means disposed opposite to one another in relation to said body, one electromagnetic means of one pair being connected in series with one electromagnetic means of the opposite pair and one of said branches and the other electromagnetic means of said one pair being connected in parallel with the other electromagnetic means of said opposite pair and the resulting parallel circuit being connected in series with the other of said branches.
References Cited (Backward Citations)
US3238788A
Cited
US3215901A
Cited
US3338644A
Cited
US3508445A
Cited
US3650581A
Cited
US3619014A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |