Air conditioning valve actuator for a motor vehicle
US6853160B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 2000 |
| Grant date | Feb 8, 2005 |
| Priority date | — |
| Expiry date | Aug 24, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K37/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An air conditioning valve actuator for a motor vehicle operating on an electric step motor with a permanent magnet capable of delivering mechanical power at least equal to 50 mW, and a reduction unit for decreasing the amplitude of the angular pitch and increase the output torque. The motor is defined by the following relationship: 10−6<γ2/R0<, wherein: γ is the torque constant, proportional to the magnet volume and, R0 is the characteristic coefficient of the volume of copper and the length of the average turn of the coils, in which R0=ρ.Lsp/(Scu.σ), ρ being the resistivity of copper, Lsp being the length of the average turn of a coil, Scu being the copper section of a coil and σ the filling coefficient of a coil. A controller is cooperative with the motor power supply enabling to accelerate gradually the frequency of the supply of the windings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.