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US3584277A Expired / Lapsed US ⏱️ 0.0 years remaining

Ferroresonant servomotor with external feedback

Assignee: MINI IND CONST MASINI
•
Filing: 1969-03-26
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Granted: 1971-06-08
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Expires: 1989-03-26
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Abstract

Abstract A squirrel-cage motor of the ferroresonant type, having two pairs of stator windings in series with respective tuning condensers energized in parallel from a source of alternating current, is provided with a feedback winding on each stator pole designed to aid or to oppose an applied control signal, all the feedback windings being connected in series across two branches of a phase-discriminating network extending from a common terminal to symmetrical taps on two parallel stator windings. Each branch includes a resistor in series with a diode, the two diodes being oppositely poled so that a voltage difference is generated across the feedback circuit upon a relative phase shift of the currents traversing the two pairs of stator windings. The common terminal is energized by an AC voltage in step with the supply voltage through a transformer or a resistive voltage divider.

Inventors

  • 👤 Dan Teodorescu

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 19:12
CPC Classifications
H; H02; H02K; H02K17/00; H02K17/02; H02K17/04; G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/1418; H02K99/00; H02K99/20

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 123 words
A servomotor comprising a stator with a plurality of poles arrayed about an axis, a short-circuited rotor centered on said axis, a source of alternating driving current for said stator, first and second winding means on respective poles in series with respective tuning condensers connected in parallel across said source, a phase-discriminating network having two branches connected between a common terminal and a pair of symmetrical taps on said first and second winding means, and a feedback circuit including respective coils on said poles serially connected across said branches for energization in response to a relative phase shift in the currents traversing said first and second winding means, said coils being connected in mutually inverted relationship with said first and second winding means.
Claim 2
Dependent Claim 123 words
A servomotor comprising a stator with a plurality of poles arrayed about an axis, a short-circuited rotor centered on said axis, a source of alternating driving current for said stator, first and second winding means on respective poles in series with respective tuning condensers connected in parallel across said source, a phase-discriminating network having two branches connected between a common terminal and a pair of symmetrical taps on said first and second winding means, and a feedback circuit including respective coils on said poles serially connected across said branches for energization in response to a relative phase shift in the currents traversing said first and second winding means, said coils being connected in mutually inverted relationship with said first and second winding means.
Claim 3
Dependent Claim 40 words
A servomotor as defined in claim 1 wherein each of said branches comprises a resistor and a diode in series, said diodes being oppositely poled, said feedback circuit being connected between respective junctions of said diodes with the associated resistors.
Claim 4
Dependent Claim 23 words
A servomotor as defined in claim 2 wherein said common terminal is coupled to said source for energization at the operating frequency thereof.
Claim 5
Dependent Claim 37 words
A servomotor as defined in claim 1 wherein each of said poles is further provided with an auxiliary winding for the application of a control signal in mutually inverted relationship with said first and second winding means.
Claim 6
Dependent Claim 33 words
A servomotor as defined in claim 1 wherein each of said poles is further provided with a biasing winding for energization by a magnetizing current enabling periodic saturation thereof by said driving current.

References Cited (Backward Citations)

US2821675A Cited
US2995690A Cited
US3083326A Cited
US3098958A Cited
US3229178A Cited
US3280398A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1974-06-07 1974-12-07 1975-06-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-06-07 1978-12-07 1979-06-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-06-07 1982-12-07 1983-06-08 $7700.00 Window Closed / Lapsed

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