Drum washing machine
US7478547B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 26, 2003 |
| Grant date | Jan 20, 2009 |
| Priority date | — |
| Expiry date | May 10, 2025 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06F2105/48
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A drum washing machine including a cylindrical drum, a DC brushless motor directly connected to the drum, a current detector detecting current flowing through the motor, a torque control vector-controlling the motor on the basis of the current detected by the current detector so that motor torque becomes optimum at least in a wash or dehydration operation, and a laundry weight estimator accelerating the motor with a maximum output torque developed when determining that motor speed is between a first speed at which laundry is assumed to start falling from an uppermost part of inner periphery of the drum when motor speed is reduced from a high speed side and a second speed at which laundry is assumed to start sticking to an uppermost part of the inner periphery of the drum, estimating laundry weight according to a q-axis current value in the vector control during an accelerating period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.