Electrical actuator with a stabilizing magnetostatic torque, and

Details Electrical actuator with a stabilizing magnetostatic torque, and Electrical actuator with a stabilizing magnetostatic torque, and

1998-04-28

2000-08-29

Rivell, John

Valves and valve actuation

Permanent or constantly energized magnet actuator

25112911, 310156, 310254, F16K 3104, H02K 117

Patent

active

061095893

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 result, a comparatively simple analog control unit can be used for controlling the angle of rotation of the rotor body (17).
In a particular embodiment of the invention, the first function substantially corresponds to a cos(.phi.) function and the second function substantially corresponds to a -sin(2.phi.) function.

REFERENCES:
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patent: 5158262 (1992-10-01), Kamerbeek et al.
patent: 5226627 (1993-07-01), Hess et al.
patent: 5345968 (1994-09-01), Day
patent: 5624100 (1997-04-01), Bolte et al.
patent: 5785296 (1998-07-01), Peube et al.
patent: 5927249 (1999-07-01), Ackermann et al.

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