Motor speed sensor advancement emulation and compensation
US7002311B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 18, 2004 |
| Grant date | Feb 21, 2006 |
| Priority date | — |
| Expiry date | Mar 18, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/153
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A microcontroller emulates advancement of a speed sensor for a motor, rather than having a physical movement of the speed sensor. The microcontroller calculates an advancement time based on the motor's efficiency. The microcontroller measures a motor speed utilizing a tachometer signal transmitted from the speed sensor. The microcontroller subtracts the emulated advancement time from the motor speed to generate a commutation countdown time. The microcontroller switches or commutates outputs when the commutation countdown time has elapsed. The microcontroller measures an actual advance time, which is a time between the commutating of the outputs and a receipt of the next speed sensor interrupt. The microcontroller calculates an anticipated motor speed by adding the actual advance time to the commutation countdown time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.