US3603869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for producing direct voltage proportional to speed
Assignee: Siemens AG
•
Filing: 1970-05-15
•
Granted: 1971-09-07
•
Expires: 1990-05-15
Abstract
Abstract A rotatable actuator is mounted on the rotor of an AC machine for rotation therewith. A pair of spaced transmitters are stationarily mounted on the stator of the AC machine in operative proximity with the actuator. Each of the transmitters produces an output signal during the time the actuator passes in close proximity therewith. A control unit couples the transmitters to the control electrodes of a plurality of electronic switches connected to the stationary windings of the machine and controls the conductive condition of the switches. Unipolar phase voltages are cyclically applied to a common output connected in common to the switches and provide a direct voltage proportional to the speed of the machine.
Inventors
- 👤 Ingemar Neuffer
- 👤 Dieter Eichmann
- 👤 Frank Langweiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:58
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/06; H02K29/12; G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/46
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
195 words
A device for producing a direct voltage proportional to speed utilizing an n-phase AC voltage machine having a rotatable inductor and a plurality of stationary windings equiangularly spaced from each other and in operative proximity with said inductor, said device comprising a rotatable actuator mounted on the rotor shaft of the AC machine for rotation therewith; a pair of spaced transmitters stationarily mounted on the stator of the AC machine in operative proximity with said rotatable actuator, each of said transmitters producing an output signal during the time said actuator passes in close proximity therewith; a plurality of electronic switches each having an output, a control electrode and an input connected to a corresponding one of the stationary windings of the AC machine; control means coupling said transmitters to the control electrodes of said switches for controlling the conductive condition of said switches in accordance with the output signals of said transmitters; and common output means connected in common to the outputs of said switches whereby unipolar phase voltages are cyclically applied to said common output means and provide in said common output means a direct voltage proportional to the speed of the AC machine.
Claim 2
Independent Claim
195 words
A device for producing a direct voltage proportional to speed utilizing an n-phase AC voltage machine having a rotatable inductor and a plurality of stationary windings equiangularly spaced from each other and in operative proximity with said inductor, said device comprising a rotatable actuator mounted on the rotor shaft of the AC machine for rotation therewith; a pair of spaced transmitters stationarily mounted on the stator of the AC machine in operative proximity with said rotatable actuator, each of said transmitters producing an output signal during the time said actuator passes in close proximity therewith; a plurality of electronic switches each having an output, a control electrode and an input connected to a corresponding one of the stationary windings of the AC machine; control means coupling said transmitters to the control electrodes of said switches for controlling the conductive condition of said switches in accordance with the output signals of said transmitters; and common output means connected in common to the outputs of said switches whereby unipolar phase voltages are cyclically applied to said common output means and provide in said common output means a direct voltage proportional to the speed of the AC machine.
Claim 3
Dependent Claim
15 words
A device as claimed in claim 1, wherein the AC machine is a reluctance machine.
Claim 4
Dependent Claim
27 words
A device as claimed in claim 1, wherein the cyclical application of voltages occurs at least during the period 2n times the respective phase voltage half waves.
Claim 5
Dependent Claim
52 words
A device as claimed in claim 1, wherein said stationary windings are arranged and are spaced from said actuator by an airgap in a manner whereby the resultant induction curve produced by said windings alternately increases and decreases substantially linearly in accordance with the rotation of the rotor of the AC machine.
Claim 6
Dependent Claim
56 words
A device as claimed in claim 1, further comprising a plurality of spaced transmitters stationarily mounted on the stator of the AC machine in operative proximity with said actuator and wherein said actuator comprises a disc having a multitrack code design thereon, each of the code tracks being scannable by a corresponding one of said transmitters.
Claim 7
Dependent Claim
57 words
A device as claimed in claim 1, further comprising a plurality of spaced transmitters stationarily mounted on the stator of the AC machine in operative proximity with said actuator and wherein said actuator comprises a disc having a reflecting multitrack code design thereon, each of the code tracks being scannable by a corresponding one of said transmitters.
Claim 8
Dependent Claim
57 words
A device as claimed in claim 1, wherein the AC machine is a four-phase AC voltage machine having four phase windings, said actuator comprises a nonmetal disc having a metal strip thereon extending over a central angle of 180*, and each of said transmitters comprises an inductive approach switch, said transmitters being displaced 90* from each other.
Claim 9
Dependent Claim
64 words
A device as claimed in claim 7, wherein the control means comprises a pair of inverters each having an output and an input connected to a corresponding one of said inductive approach switches, and four AND gates each having an input connected to the output of an inverter and an output connected to the control electrode of a corresponding one of said electronic switches.
Claim 10
Dependent Claim
53 words
A device as claimed in claim 7, wherein said common output means includes an amplifier having an input and a plurality of variable resistors each connected to one end in common to the input of said amplifier and at the other end to the output of a corresponding one of said electronic switches.
Claim 11
Dependent Claim
15 words
A device as claimed in claim 7, wherein said control means provides a switch-off delay.
Claim 12
Dependent Claim
67 words
A device as claimed in claim 7, wherein two of the four phase windings of the AC machine are displaced 180* from each other and are connected in series in opposed polarities and said common output means includes a plurality of resistors and a difference amplifier having inputs connected to the series-connected phase windings via corresponding ones of said resistors and corresponding ones of said electronic switches.
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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |