Retrofit damper system with back EMF position and end stop detection
US11255557B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 2018 |
| Grant date | Feb 22, 2022 |
| Priority date | — |
| Expiry date | Jul 9, 2039 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24F2013/1433
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A retrofit damper system is configured for installation in existing ductwork including a duct supplying conditioned air through a register boot to a register vent. The retrofit damper system includes a damper assembly including a damper blade and a damper motor configured to drive the damper blade between a closed end position and an open end position. A control module includes a control module housing and a controller within the control module housing that is configured to regulate operation of the damper motor. The controller outputs a drive signal that causes the electric damper motor to drive the damper blade to the desired position and creates a plurality of interruptions in the drive signal while driving the damper blade. A sense circuit senses back EMF signal, and the controller estimates a blade position based at least in part on the back EMF signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.