Inverter-drive controlling apparatus
US4636928A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1984 |
| Grant date | Jan 13, 1987 |
| Priority date | — |
| Expiry date | Sep 27, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P27/047
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In an inverter-drive controlling apparatus in accordance with a simulated sinusoidal wave non-uniform PWM system, data of one carrier period comprises data region of integer number, and at least one HALT region, and the carrier period T.sub.0 and data unit timer T.sub.2 are produced by frequency division from a common reference oscillator, and the frequency divisions to obtain the carrier period T.sub.0 and the data unit timer T.sub.2 are controlled individually from each other, thereby output frequency to the inverter and output voltage thereto can be desirably controlled in digital process; thereby even utilizing limited area for storing sinusoidal wave data, accurately simulated sinusoidal waveform and good characteristic of the voltage-frequency is attainable and completely synchronized switching of plural waveform data regions are obtainable, thereby enabling adjusting of the revolution speed of electric motor in extremely wide range and up to a very high speed, and the waveform becomes very good.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.