Electrical actuator with a stabilizing magnetostatic torque, and a throttle device provided with such an actuator
US6109589A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 28, 1998 |
| Grant date | Aug 29, 2000 |
| Priority date | — |
| Expiry date | Apr 28, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/8635
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An electrical actuator (11, 85) comprises a magnetically permeable stator body (13) and a permanently magnetic rotor body (17) which is pivotable relative to the stator body (13) through a limited angle of rotation (.phi.). The stator body (13) exerts a magnetostatic torque (T.sub.MS) on the rotor body (17) and comprises electrical energizing means (29) for exerting an electromagnetic torque (T.sub.EM) on the rotor body (17). T.sub.EM is substantially proportional to a value (I) of an electrical current through the energizing means (29) and depends on .phi. in accordance with a first function of .phi., while T.sub.MS depends on .phi. in accordance with a second function of .phi.. According to the invention, said first function is substantially different from said second function, while it is true for each position of equilibrium of the rotor body (17), in which the resultant T.sub.R of T.sub.EM and T.sub.MS is zero for a predetermined value I, that T.sub.R has a positive value if .phi. decreases and T.sub.R has a negative value if .phi. increases while I is constant. In this manner, the positions of equilibrium are stable and are each determined by a predetermined value of I. As a …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.