Braking device
US10851574B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 2018 |
| Grant date | Dec 1, 2020 |
| Priority date | — |
| Expiry date | Mar 10, 2038 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/132
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A braking device for a movable door wing comprises an electric motor operated as a generator with a motor shaft which is rotatable by a movement of the door wing and which expends motion-dependent motor voltage at a contact pair, as well as a braking circuit upon which the motor voltage is applied or applicable and via which, the contact pair is short-circuitable in order to dampen a movement of the door wing. It is provided that the braking circuit comprises two anti-serially arranged field-effect transistors wherein their drain terminals are connected each to another contact of the contact pair and wherein their source terminals are connected to each other and preferably also connected to earth or a zero line, so that the contact pair is short-circuited depending on the switching state of the field effect transistors. Alternatively or in addition to such a design of the braking circuit, provision is made that the electric motor is designed as a brushless electric motor with a plurality of stator coils, in each of which an AC voltage is induced as a function of the movement of the door wing, and that one of the AC voltages induced in the stator coils is outputted at the contact pa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.