US3967174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic commutation apparatus for a brushless D.C. motor
Assignee: Siemens AG
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Filing: 1974-09-26
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Granted: 1976-06-29
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Expires: 1994-09-26
Abstract
Abstract This invention is for apparatus used in combination with electronic commutation circuitry for a D.C. motor with a Y-connected stator winding wherein current control is accomplished by means of a cyclic current regulator. Current to the regulator is applied to the regulator by means of a series connected choke inductor and resistor, across which is connected in parallel a by-pass diode.
Inventors
- 👤 Georg Kogler
- 👤 Hans Kuhnlein
- 👤 Manfred Liska
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:11
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/08; H02P6/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
100 words
In combination with a D.C. motor with Y-connected stator windings wherein each stator winding is connected in series with an electronic commutation device, a current control circuit comprising, a series connected smoothing choke and current measuring resistor wherein said resistor is connected to the commons connection of the windings, a by-pass diode connected in parallel across said series connected choke and resistor, a current regulator comprising, means for generating a signal proportional to the voltage across said current measuring resistor, and means for cyclically connecting the output of said current regulator to the electronic commutation devices connected to the windings.
Claim 2
Dependent Claim
100 words
In combination with a D.C. motor with Y-connected stator windings wherein each stator winding is connected in series with an electronic commutation device, a current control circuit comprising, a series connected smoothing choke and current measuring resistor wherein said resistor is connected to the commons connection of the windings, a by-pass diode connected in parallel across said series connected choke and resistor, a current regulator comprising, means for generating a signal proportional to the voltage across said current measuring resistor, and means for cyclically connecting the output of said current regulator to the electronic commutation devices connected to the windings.
Claim 3
Dependent Claim
17 words
The current control circuit of claim 1 having a resistor connected in series with said by-pass diode.
Claim 4
Dependent Claim
58 words
The current control circuit of claim 1 wherein said current regulator is an operational amplifier with resistive feedback wherein the non-inverting input terminal is connected by means of an input resistor to the connection between said choke inductor and said current measuring resistor, and the inverting input is connected to the common terminal of said Y-connected stator windings.
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) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |