Brushless tachometer generator
US4364005A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 1980 |
| Grant date | Dec 14, 1982 |
| Priority date | — |
| Expiry date | Jul 16, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S322/05
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A tachometer generator comprising a generator section for producing rectangular polyphase alternating voltages having a peak value which is proportional to the speed of the rotor, and a commutator section including contactless change-over switches for successively transferring the alternating voltages from the generator section, and sensors for producing switching signals which actuate the change-over switches in accordance with the rotational position of the rotor of the generator section. In the commutator section the sensors are equivalent in number to the change-over switches and comprise Hall devices arrayed about a rotary shaft which is coupled to the generator section. The alternating voltages which are obtained successively from the coils of the generator section as the rotary shaft rotates, are transferred in order by the change-over switches to produce a speed signal, in analog form; which is proportional to the rotating speed of the rotor. The axially extending width of the rotor is smaller than the axially extending width of the stator, the width of the rotor being approximately 80% that of the stator. A magnetic shield plate is interposed between the generator section …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.