Drive arrangement
US5271348A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1992 |
| Grant date | Dec 21, 1993 |
| Priority date | — |
| Expiry date | Dec 21, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P23/0077
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A drive arrangement comprises an a.c. induction motor (M1) having a rotary output shaft, and a drive control (FIG. 2), by which the speed of rotation of the shaft is controlled. The drive control comprises a signalling arrangement (e.g. a transducer (T) supplying an analogue signal converted by an analogue-to-digital converter (ADC) or a direct digital signalling arrangement) for supplying a digital signal having a value corresponding to the desired speed of rotation of the motor shaft, together with a processor (CPU) which receives the digital signal and at least one other input and processes the digital signal in accordance therewith. The processor supplies a corresponding, but modified, digital output signal to a digital-to-analogue converter (DAC) which converts the digital output signal to an analogue control signal and supplies it to an inverter which, in response thereto, drives the a.c. induction motor. An encoder (E) is operatively connected to the output shaft of the motor and supplies monitoring signals to the processor which processes them to provide a comparison value (representing actual rotation speed of the shaft) for comparison with a value corresponding to the sig…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.