Observer-based ripple detection for speed and position measurement for brushed direct current motors
US12081159B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 2022 |
| Grant date | Sep 3, 2024 |
| Priority date | — |
| Expiry date | Sep 15, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P27/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor control system and method for controlling a brushed direct current (BDC) motor using a feedback loop based on a corrected ripple count. Motor control circuitry, for example implemented in digital logic such as a microcontroller, receives a coil current signal and a motor voltage signal. Discontinuities in the coil current signal, such as caused by commutation of the BDC motor, are counted to generate a ripple count. An observer function derives an angular frequency model estimate for the values of the coil current and motor voltage signals using a computational model for the motor. A corrected ripple count is generated based on a comparison of a commutation angle of the motor with an angular position based on the angular frequency model estimate over a time interval between discontinuity pulses. A motor drive signal is adjusted based on the corrected ripple count.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.