Stepping motor type indicator having a pole tooth with reduced end area
US6211585A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 5, 1999 |
| Grant date | Apr 3, 2001 |
| Priority date | — |
| Expiry date | Apr 5, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R7/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A stepping motor type indicator provided with unambiguous stable points having a holding force in a non-excited condition sufficient to suppress undesirable movements of a pointer. The stepping motor type indicator includes a stepping motor (2) having a rotor (28) with an output shaft (27) and stators (A, B). Yokes (23, 26) have a plurality of pole teeth (232, 233, 262, 263) extending toward curved outer surfaces of the rotor. The pole ends of a specific pole tooth (232a) chosen from one of the plurality of pole teeth is made to have a pole end area different than that of the remaining pole teeth. This structure produces unambiguous stable points ("a"-"l") and produces strong holding forces so that an attractive force exerted by the stable point ("a") on the pointer (4) toward stopper pin (7) is increased to positively suppress undesirable movements of pointer (4).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.