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Linear electric motors

An armature, electromagnetic technology, used in electric components, electromechanical devices, electrical components, etc.

Inactive Publication Date: 2009-05-13
ILLINOIS TOOL WORKS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, problems arise when they are used with light loads and they are required to accurately reproduce a specific operational force profile

Method used

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  • Linear electric motors

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Embodiment Construction

[0008] A preferred embodiment of the invention is a linear motor, the stator of which is configured to generate a radial magnetic field and the armature of which constitutes a piston-like part which is axially movable in this magnetic field.

[0009] As shown, the stator comprises a tubular cylinder of circular cross-section formed by a cylindrical portion 10 having an open end sealed by end caps 11 and 12 . The cylindrical section 10 comprises a series of coils arranged side by side and wound so that when energized by a current passing through them they will generate a radial magnetic field disposed axially along the length of the cylindrical section. These coils also define an annular air gap with the mandrel 14 , the ends of which are located in the end caps 11 and 12 .

[0010] A tubular armature 16 is located in the air gap and includes a series of magnetic assemblies. The magnetic assembly is preferably in the form of a permanent magnet with pole pieces producing a seri...

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Abstract

A linear electric motor comprises an electromagnetic piston and cylinder device comprising a plurality of stator coils disposed side by side around an axis and wound so as to create a radial magnetic field which alternates its polarity along the length of the axis, when energised, an armature located within the stator and moveable in a direction co-axial with the axis of the stator, and a bearing arrangement for supporting the armature for reciprocation with respect to the stator, characterised in that the bearing arrangement comprises non-magnetic material.

Description

technical field [0001] The present invention relates to linear electric motors. Background technique [0002] Linear electric motors have been known for many years, one such motor takes the form of a piston and cylindrical device such as that disclosed in GB-A-1308349 comprising a tubular stator with radially polarized magnetic material , and defines an air gap in which a movable armature coil is disposed for axial movement. [0003] Such electric motors are used in many applications to replace hydraulic piston cylindrical devices. However, problems arise when they are used with light loads and they are required to accurately reproduce a specific operational force profile. Contents of the invention [0004] The object of the present invention is to provide an electromagnetic linear motor in the form of a piston and cylinder device which overcomes the above-mentioned problems of this device. [0005] The present invention provides an electromagnetic piston and cylindrica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K41/02
CPCH02K7/083H02K33/00H02K33/02H02K41/02
Inventor 格雷厄姆·米德埃里克·马德拉塞克
Owner ILLINOIS TOOL WORKS INC