Comminuting device including a rotary current asynchronous motor and a non-positive traction drive and method for its operation
US9233376B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 21, 2014 |
| Grant date | Jan 12, 2016 |
| Priority date | — |
| Expiry date | Feb 21, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P27/06
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A comminuting rotor is driven by a rotary current electric motor via a non-positive traction drive, wherein said rotary current electric motor is energized by a controlled frequency converter for operating the comminuting rotor at a predetermined rotational speed during the normal operating phase. A degree of slip of the traction drive is determined and monitored and the rotary current electric motor is controlled for being powered off if a first slip threshold value is exceeded. If a predetermined second threshold of the traction drive slip is exceeded, which is below said first slip threshold, for continuing the operation of the comminuting device, the frequency converter is controlled in a slip operating phase for a closed or open loop control of the traction drive slip to a predetermined third slip threshold value and for reducing the torque output from the rotary current electric motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.