RO125491A0 - Linear electric motor with limited displacement - Google Patents

Abstract

The invention relates to an electric motor with limited displacement meant for some applications such as actuating apparatuses for electric devices, stands for testing resistance against shocks and vibrations, strikers and others. According to the invention, the motor consists of a "shielded" type mono-phased magnetic system (1), having mounted on a column of the system (1), a fixed coil consisting of two sections (2 and 2;) and a mobile coil (3) in short-circuit, which is integral with a slide (6) which slides on a guide axle (5), the two sections (2 and 2') of the fixed coil being supplied successively, from a source of alternating current, by means of two switches (7 and 7').

Description

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Electric motor with limited movement

The invention relates to an electric motor with limited displacement, which can be translational or oscillating, being controlled with adjustable frequency and intended for special applications such as: actuators for electrical appliances, shock test stands and mechanical vibrations, strikers, etc.

A motor [1] is known to perform a translational or oscillating motion, consisting of permanent magnets consolidated in a magnetic yoke, as well as a high permeability magnetic core, between which moves the moving part consisting of a coil of force (main) and a measuring coil, which together form a single cylindrical body. There is also a compensation coil on the magnetic core. The motor control is made of an operational amplifier, at the inputs of which the voltage difference on the measuring coil and the compensating coil is applied. The described motor has the disadvantage that it is complicated, having a limited power; it can only operate in direct current, being recommended only in the kayak technique.

The motor, according to the invention, eliminates the mentioned disadvantages, in that it consists of a single-phase magnetic system of "sheath" type, having mounted on the column a fixed coil, with or without intermediate socket, representing the primary winding, as well as a movable coil. in short circuit, mounted in a concentric position with the fixed coil, having a lower height than the fixed coil and where at the moment of feeding the fixed winding, between the two coils strong electrodynamic forces develop which causes the ultra-fast movement of the moving coil, in a limited range, resulting in the development of a considerable mechanical force on the actuated element.

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The engine according to the invention has the following advantages:

- can be made in a wide constructive diversity, with or without return spring, with limited translational or rotational movement, with vibrations with variable frequency and amplitude;

- can be used to make stands for testing electrical systems, shocks and vibrations that have certain laws of variation;

- can be built at any power allowed by transformer manufacturing technology;

- can be built in single-phase and three-phase version;

- it can be made in the ultra-fast version if the moving part has minimized inertia, thus being able to operate ultra-fast electrical appliances with contacts with simplified construction, possibly synchronized;

- it can operate on a short-term basis, on a regular intermittent basis or on a long-term basis, after proper design;

- has a limited stroke which can be translational (for columnar magnetic transformers) or rotary (for rolled magnetic transformers);

- has no air gap or has a minimized air gap, no moving ferromagnetic bodies;

- does not require a kinematic chain made of parts to achieve the required type of movement.

An embodiment of the invention is given below in connection with FIG. 1, fig. 2, fig. 3 and fig. 4, which is as follows:

- fig. 1 - explanatory to the dynamic forces that develop in an electromechanical system with short-circuit winding (the case of identical and staggered windings);

- fig. 2 - explanatory to the electrodynamic forces that develop in an electromechanical system with short-winding winding (the case of windings with different and staggered heights);

- fig. 3 - principle electrical diagram of the electric motor with limited translational motion;

- fig. 4 - cross section by motor;

- fig. 5 - constructive variants of the moving coil.

A 2 009-00334-2 î 04- 2009

- fig. 4 - oarmcsal section through rmaoi:

- fisi. 5 - constructive variants of the moving coil.

î n fia. And in either. 2 surit presented two cases that lead to the pleasant icalization of the electric motor, according to the invention.

FIG. I presents the case of two concentric windings, one primary, the other secondary, having the same height, when they are placed staggered apart from each other. The currents in the two coils have opposite meanings, so there is a relationship between the mechanical laws that arise: A - / · .. These pole forces are decomposed into radial components. F \ _x and / -3, -. and in the axial components -1 · ^ and / '?. in the case of the engine. According to the invention, the axial forces / n and A are used.

in fig. 2 shows the case applied concretely in the case of the studied engine. As in the previous case, the axial forces play the main role in the operation of the motor.

The invention is based on a single-phase magnetic system I. made of electrotechnical sheet metal, on which is a fixed arc. ... established in two sections 2 and 2 'respectively. which are returned by inicrmcci ... 'to a median outlet. Concentrically with the first winding, a movable coil is mounted in the short reindeer 3. made of a single coil, obtained by casting. The moving coil moves between two stops 4. which determines the position corresponding to the situation presented ;: in lig. . The successive addition of the sections ± and 2 of the primary encapsulation is related to the switching of some switches; /. respectively /. horse pole be as appropriate. Non-dynamic switching machines or automatic machines with electromagnetic or static contactors, as static couplers, can be used with antiparallel or triacon mounted devices.

The electric motor with motion they move limnaia. According to the invention, it can be reproduced with the same characteristics and performances whenever it is needed, which is a weapon in the field of compliance with the criteria of industrial applicability.

Claims (1)

0 3 3 4-2 1 -0V 2009 Claim Electric motor with limited movement, characterized in that it consists of a single-phase mechanical system of the "jacket" type (1), having mounted on the column a fixed coil consisting of two sections (2 and 2 ', respectively), as well as and a short-circuiting movable coil (3) forming a common body with a slide (6), which in turn slides on a guide shaft (5); the coil (2), which is the primary motor, can be supplied from a single-phase alternating current source by means of switches (7), non-automatic with dynamic switching or automatic with electromagnetic contactors or static contactors.