US3612926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pickoff device for rotary machines
Assignee: Telefunken Electronic GmbH
•
Filing: 1970-01-26
•
Granted: 1971-10-12
•
Expires: 1990-01-26
Abstract
Abstract A pickoff device for a rotary machine in which radiation from a stationary radiation source is variably reflected by a reflector rotating with the rotor on to a stationary radiation sensor. A plurality of sensors may be provided and the radiation may be reflected successively on them. The outputs of the sensors may be used to control field windings where the machine is a direct current machine.
Inventors
- 👤 Walter Zizelmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:23
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/06; H02K29/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
114 words
A pickoff device for a brushless direct-current machine comprising: a stationary cylindrical housing having a base, said cylindrical housing being mounted adjacent the rotor of said machine and coaxial with the shaft thereof, a radiation-emitting semiconductor component disposed in the center of said base; a plurality of radiation-sensitive semiconductor components directly mounted on said base and concentrically surrounding said radiation-emitting semiconductor component, said radiation-sensitive semiconductor components all having the same angular spacing between adjacent ones thereof; and a reflecting means mounted on the end face of the shaft of said rotor for rotation therewith for reflecting the radiation emanating from said radiation-emitting semiconductor component consecutively onto said radiation-sensitive semiconductor components as said rotor rotates.
Claim 2
Dependent Claim
114 words
A pickoff device for a brushless direct-current machine comprising: a stationary cylindrical housing having a base, said cylindrical housing being mounted adjacent the rotor of said machine and coaxial with the shaft thereof, a radiation-emitting semiconductor component disposed in the center of said base; a plurality of radiation-sensitive semiconductor components directly mounted on said base and concentrically surrounding said radiation-emitting semiconductor component, said radiation-sensitive semiconductor components all having the same angular spacing between adjacent ones thereof; and a reflecting means mounted on the end face of the shaft of said rotor for rotation therewith for reflecting the radiation emanating from said radiation-emitting semiconductor component consecutively onto said radiation-sensitive semiconductor components as said rotor rotates.
Claim 3
Dependent Claim
91 words
A pickoff device as defined in claim 1, wherein said rotor includes at least one permanent magnet having a south pole and a north pole; wherein the number of said radiation-sensitive semiconductor components corresponds to the number of poles in said direct-current machine; and wherein means responsive to the outputs of said radiation-sensitive semiconductor components are provided for causing the functionally correct control of the field current of said direct current machine depending on the particular position of said rotor relative to the poles of the stator of said direct-current machine.
Claim 4
Dependent Claim
53 words
A pickoff device as defined in claim 1 including means for causing the functionally correct control of the field current of said direct-current machine, depending on the particular position of the rotor in relation to the poles of the stator of said direct current machine, for the outputs of said radiation-sensitive semiconductor components.
Claim 5
Dependent Claim
26 words
A pickoff dEvice as defined in claim 3, wherein the number of said radiation-sensitive semiconductor components corresponds to the number of poles in said direct-current machine.
Claim 6
Dependent Claim
27 words
A pickoff device as defined in claim 3, further comprising at least one permanent magnet having a south pole and a north pole carried by said rotor.
Claim 7
Dependent Claim
19 words
A pickoff device as defined in claim 1, wherein said radiation-emitting semiconductor component comprises a gallium arsenide luminous diode.
Claim 8
Dependent Claim
16 words
A pickoff device as defined in claim 6, wherein said radiation-sensitive semiconductor components comprise silicon photodiodes.
Claim 9
Dependent Claim
16 words
A pickoff device as defined in claim 6, wherein said radiation-sensitive semiconductor components comprise silicon phototransistors.
Claim 10
Dependent Claim
25 words
A pickoff device as defined in claim 1, further comprising a radiation-transmitting synthetic resin in which said radiation-emitting and said radiation-sensitive semiconductor components are embedded.
References Cited (Backward Citations)
US3257594A
Cited
US3436540A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |