JPS5944962A - High magnetic flux density field for linear motor - Google Patents

Abstract

PURPOSE:To obtain a field which has high magnetic flux density by alternately laminating a permanent magnet and a conductor of a yoke forming a field along the moving direction of a movable element. CONSTITUTION:A permanent magnet 23 and a yoke 24 are held by nonmagnetic retaining members 21, 22, which are secured at an interval via a supporting member 25. The magnet 23 and the yoke 24 of the magnetic conductor are alternately laminated along the moving direction of a movable element 27. The magnets 23 are aligned so that N-poles and S-poles are respectively opposed each other, and aligned so that the N-poles and the S-poles are oppositely disposed at the sides of the members 21, 22, thereby forming magnetic space groups in which the direction of the magnetic field are alternately directed oppositely.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for configuring a magnetic space group of a linear motor field. The present invention is particularly suitable for t! A five-pin coil consisting of magnetic space groups facing alternately in opposite directions and 2411 coils wound into a flat plate? 'The purpose of this project is to obtain a field with higher magnetic flux density by improving the method of configuring the field in a U-style linear motor. This type of motor utilizes the force exerted on the FI flow flowing through the magnetic field, and the magnitude of this force is proportional to the product of magnetic flux density and current.
Therefore, by increasing the magnetic flux density, it is possible to obtain a motor with good current-to-thrust ratio characteristics that generates a large force with a small amount of current.

FIG. 1 shows a schematic diagram of a front UJ view and a side view of an example of a conventional linear motor using a field. 1 and 2 are a1 conductors that constitute a part of the magnetic path, which also serve as holding members for the permanent magnet 3, and are fixed at a distance by the support member shown in 4, and the permanent magnets follow the magnetic path shown in 5. arranged to form
They form a magnetic space group in which the directions of the magnetic fields alternate in opposite directions.

On the other hand, numerals 6 and 7 are coils constituting a moving element, which move along the arrow 8 within the magnetic space group. Such a configuration 1ζ
In 1, the field is composed of opposing permanent magnets and magnetic conductors 1 and 2 that close their magnetic paths on the /r plane, so the thickness of the permanent magnets can be arbitrarily selected to some extent, but the area is limited by the arrangement pitch of the magnetic field. but,
Since the surface of the magnet directly serves as a magnetic pole, there is a limit to the magnetic flux density of the magnet itself, and even if the thickness of the permanent magnet is increased, it is difficult to obtain a magnetic flux density higher than the above limit value.

The high magnetic flux density field for linear motors according to the present invention will be explained in detail below, but since the operating principle of this type of motor is already known and the present invention is not related to the operating principle, I won't touch on the principle.

FIG. 2 schematically shows a front view and a side view of an application example of a high magnetic flux density field for a linear motor according to the present invention. In the figure, reference numerals 21 and 22 are non-magnetic permanent magnet and yoke holding members that do not contribute to the structure of the magnetic path, and are fixed by a support member 25 with a distance maintained between them. 23 is a permanent magnet, and 24 is a yoke of magnetic conductor, which are alternately stacked along the direction of the moving force of the moving element. The permanent AT stones are arranged so that N and N and S and S face each other, and are further arranged so that they are opposite on the holding member 21 side and 22 side, so that the magnetic path is closed as shown by the arrow 26, and the magnetic field is They constitute a magnetic space group whose directions alternately point in opposite directions.
By adopting such a configuration, the thickness of the permanent magnet is limited to some extent by the arrangement pitch of the magnetic field, but it can be almost sufficiently thick, and the iC1 product is not limited by the arrangement pitch of the magnetic field. In addition, since it is focused by the yoke, it is possible to obtain a field with a high magnetic flux density. Maj
: Since the magnetic space group constituted by the high magnetic flux density field for linear motors according to the present invention is the same as the magnetic space BY constituted by the conventional field 1 except for its strength, its control is different ( Instead, compatibility with conventional motors is maintained and the current-to-thrust and power-to-thrust ratios are improved.

This concludes the detailed explanation of the high magnetic flux density field for linear motors according to the present invention, but it is possible to change the shape and configuration of the members constituting the magnetic space BY without changing the gist of the present invention. I can't say that.

[Brief explanation of drawings]

Fig. 1 is a front view and a schematic side view of an example of a linear motor using a conventional field, and Fig. 2 is a front view and a schematic diagram of an example of an application of a 'R magnetic flux density field for a linear motor according to the present invention. FIG. 3 is a schematic side view. Patent Applicant: Tokyo Elecron Co., Ltd. 2nd Group Procedural Amendment (Method) 1. Display of case 1982 Patent Application No. 1530
86 No. 2, name of invention Linear motor month J
1NEI! 54-Seven Degrees (3, Those who missed the amendment 5, Subject of amendment Application and specification 6, Contents of amendment As shown in the attached sheet)

Claims (1)

[Scope of Claims] A linear motor having a field in which, along the moving direction of a moving element, magnetic space groups whose magnetic field directions are perpendicular to the moving direction and alternately oriented in opposite directions are arranged in a straight line at equal intervals. A high magnetic flux density field for a linear motor, characterized in that permanent magnets and magnetic conductor yokes forming the field are stacked alternately along the moving direction of the displacement.