Double-acting electromagnetic actuator

Details Double-acting electromagnetic actuator Double-acting electromagnetic actuator

1999-05-03

2001-06-12

Fleming, Fritz (Department: 2836)

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

C361S210000, C335S226000

Reexamination Certificate

active

06246563

ABSTRACT:

Present invention relates to an electromagnetic actuator having a rapid linear motion with a moderate length of stroke.
STATE OF THE ART
It is previously known with coils being movable under the influence of magnetic fields. Such an example could be found in loud speakers with stationary permanent magnets having a movable voice coil arranged in the magnetic field induced by the permanent magnet. The winding of the voice coil is connected to an external power source, and by current control the coil could be given the intended motion. A drawback with this solution is that the external connections are movable and subject to a potential interruption.
In U.S. Pat. No. 5294850 is further known a device wherein an electromagnetic field-effect could launch missiles. In this solution a stationary coil is used, which affects a coil arranged on or in contact with the missile to be launched. The movable coil is lacking any external connections and the winding is short-circuited, or alternatively divided into several coil segments, and wherein the electromagnetic field is controlled by the current in the stationary coil.
In U.S. Pat. No. 1066081 is shown in an alternative embodiment, i.e.
FIGS. 4 and 5
, a relay having a stationary and a movable coil. The winding of the movable coil is connected to a stationary circuit breaker, and the movable coil is affected in a controlled manner in one direction by said circuit breaker and the magnetic field induced from the stationary coil.
A conventional solution, in order to obtain a double-acting actuator, utilize a stationary solenoid and a movable iron core, which iron core is forced towards a first end position using a return spring.
When the iron core is activated towards the second end position, then the force from the electromagnetic field must overcome the counteracting force from the return spring and initiate movement of the mass of the iron core. This will bring about a decrease in response, due to the rather large mass of the actuator and need to overcome the force from the return spring.
OBJECT OF THE INVENTION
The object of the invention is to obtain an electromagnetic actuator useful for most situations where a double acting and rapid movement with a moderate length of stroke is requested. Another object is to obtain an electromagnetic actuator with a quick response, yet another object is to obtain an electromagnetic actuator lacking any electrical connections to the movable part of the electromagnetic actuator.
An object with a further refined embodiment is to be able to obtain a feed-back signal of the position of the actuator, whereby an improved control with increased accuracy of movement of the actuator could be obtained.
SHORT DESCRIPTION OF THE INVENTION.
The inventive electromagnetic actuator is an electromagnetic actuator for a rapid linear motion with a limited length of stroke, with a stationary arranged first coil and a second movable coil, wherein the winding of the stationary coil is connected to a controllable power source. The winding of the movable coil is short-circuited without any galvanic contact with external power sources in that the ends of the winding of the movable coil are short-circuited via a rectifier element, which rectifier element only allows current to be developed in one direction in the winding of the movable coil, which current in the movable coil is induced from an electromagnetic field generated by a current through the stationary coil
The inventive electromagnetic actuator is a double acting electromagnetic actuator that can be obtained with less dead weight of all moving parts and which will give a rapid response of the actuator. The electromagnetic actuator will also exhibit a lack of any electrical connections to the movable part, which will give a high order of reliability.
Other distinguishing features and advantages of the invention will be evident from the characterising parts of the claims, and following description of embodiments. The description of embodiments are made by reference to figures from the following list of figures.


REFERENCES:
patent: 1066081 (1913-07-01), Coleman
patent: 1711285 (1929-04-01), Petersen
patent: 1792512 (1931-02-01), Siegmund
patent: 2736843 (1956-02-01), Douglas et al.
patent: 2989668 (1961-06-01), Parisoe
patent: 3524111 (1970-08-01), Maecker et al.
patent: 3585458 (1971-06-01), Yoshimura
patent: 4032823 (1977-06-01), Arvisenet et al.
patent: 4598178 (1986-07-01), Rollins

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