Method for controlling an electric motor by using the PWM technique
US8159172B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 26, 2008 |
| Grant date | Apr 17, 2012 |
| Priority date | — |
| Expiry date | Dec 7, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P7/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for controlling an electric motor by using the PWM technique including the steps of: applying to the clamps of the electric motor an electric voltage varying in time, which displays a square waveform and consists of a sequence of pulses having a uniform wave period and a variable width; adjusting the average value of the electric voltage by varying the width of the pulses; determining the overall required width variation; subdividing the overall required width variation in a determined number of partial variations, the overall sum of which is equivalent to the overall required width variation; and gradually varying the width amplitude of the pulses of the electric voltage by applying in a sequence a corresponding partial variation to each pulse, so that the difference between the width amplitude of a pulse and the width of a following pulse is equivalent to the corresponding partial variation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.