Device for determining the resistive torque of a rotating item of equipment, system for monitoring the operation of an electric motor and system for regulating the operating parameters of a centrifuge incorporating such a device
US6205405A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 26, 1997 |
| Grant date | Mar 20, 2001 |
| Priority date | — |
| Expiry date | Sep 26, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P23/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A device for determining the resistive torque of an item of equipment driven by an asynchronous electric motor operated by a control unit delivering to the motor an alternating voltage for controlling the rotational speed of the motor includes a measuring unit for measuring the rotational speed, a calculator for calculating the motor slip from the said rotational speed and the synchronous speed of the magnetic field generated by the power-supply voltage and a comparator for comparing the calculated value of slip and a set of predetermined slip values each corresponding to a resistive torque value, so that the resistive torque of the item of equipment can be determined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.