WO2002103885A1

WO2002103885A1 - Linear motor

Info

Publication number: WO2002103885A1
Application number: PCT/JP2002/005450
Authority: WO
Inventors: Kenichi Sadakane; Yasuhiro Miyamoto
Original assignee: Kabushiki Kaisha Yaskawa Denki
Priority date: 2001-06-14
Filing date: 2002-06-03
Publication date: 2002-12-27
Also published as: JP2002374665A

Abstract

An inexpensive linear motor such that a magnetic small piece attracted to a permanent magnet can be easily removed and the man-hour of the assembling is reduced. The linear motor comprises field poles (3) composed of permanent magnets (2) so linearly arranged that the polarities of the poles are alternate, an armature core having teeth and slots with intervals with the field poles, and an armature winding composed of a coil and mounted in the slot of the armature core. The filed poles are parallelogram permanent magnets (2a), which can be a permanent magnet unit equivalent to multiple permanent magnets and fabricated by magnetizing a one-piece parallelogram permanent magnet blank in multipole.

Description

Specification

Linear motor

[Technical field]

The present invention relates to a linear motor used for FA such as a machine tool or a semiconductor manufacturing device.

[Background technology]

A conventional linear motor has a structure as shown in FIG. FIG. 7 is a front view showing an entire configuration of a permanent magnet synchronous linear motor. In the figure, 3 is a field pole and 7 is an armature. In this example, the field pole 3 is fixed and the armature 7 is movable. The field pole 3 is made up of permanent magnets 2 arranged in a yoke 1, and the armature 7 has a coil 5 wound around the teeth of the laminated armature core 4, and the armature core 4 and the coil 5 as a whole. Is molded integrally with molding resin 6. The stator 3 and the armature 7 are arranged in a certain gap to form a permanent magnet synchronous linear motor.

As shown in Fig. 8, the permanent magnets 2 are not arranged at right angles to the longitudinal direction of the yoke 1. It is structured to be attached. This inclination is provided to suppress cogging thrust.

However, in such a linear motor, during inspection before operation, small pieces of magnetic material are permanently attached between the permanent magnet of the field pole and the adjacent permanent magnet, and on the side and top surfaces of the permanent magnet fixed at an arbitrary inclination. It was sometimes attracted and adhered by the magnetic force of the magnet. This small piece of magnetic material cannot be easily removed, and if used with the small piece remaining attached, it will get into the gap between the field pole and the armature, damaging both and degrading the characteristics of the motor. It causes deterioration.

In addition, since the permanent magnet has a rectangular shape and needs to be fixed at a certain angle to the workpiece, it is molded using an expensive template jig, which increases the number of assembly steps and reduces the cost of the inexpensive stator. Difficult to supply. Accordingly, an object of the present invention is to provide an inexpensive linear motor that can easily remove small pieces of magnetic material attached to a permanent magnet and that reduces the number of assembly steps.

[Disclosure of the Invention]

The present invention relates to a field pole in which a plurality of permanent magnets are linearly arranged on a yoke surface so as to have alternately different poles, and a slot of an armature core having teeth and slots through a gap in the field pole. And a permanent magnet of the field pole is formed in a parallelogram shape in a linear motor provided with an armature composed of an armature winding having a coil wound around the coil.

Further, the permanent magnet may be configured as a permanent magnet unit formed by performing multipolar magnetization on an integral parallelogram-shaped permanent magnet material corresponding to a plurality of permanent magnets.

With the above configuration, according to the present invention, small pieces attached to the permanent magnet can be easily removed, and the number of assembly steps can be reduced to obtain an inexpensive stator.

[Brief description of drawings]

FIG. 1 is a plan view of a field pole showing a first embodiment of the present invention. FIG. 2 is a plan view showing the permanent magnet of FIG. FIG. 3 is a plan view of a field pole showing a second embodiment of the present invention. FIG. 4 is a plan view showing the permanent magnet unit of FIG. FIG. 5 is a plan view of a field pole showing a third embodiment of the present invention. FIG. 6 is a plan view showing the permanent magnet unit of FIG. FIG. 7 is a front view showing a conventional linear motor. FIG. 8 is a plan view showing the permanent magnet of FIG.

[Best Mode for Carrying Out the Invention]

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)

FIG. 1 is a plan view of a field pole showing a first embodiment of the present invention, and FIG. 2 is an enlarged plan view of the permanent magnet of FIG. The overall configuration is the same as before, with the field poles on the fixed side and the armature on the movable side, and the same parts have the same reference numerals. Therefore, the description of the same reference numerals is omitted. In the figure, 2a is the minimum of the parallelogram The unit is a permanent magnet. The field pole 3 has a configuration in which a plurality of permanent magnets 2a each having a single pole magnetized on the yoke 1 are fixed in parallel so that the magnetic poles are alternately different. When assembling the stator, it is not necessary to use an expensive template jig having a complicated shape, so that the assembly can be easily performed. In addition, since there is no gap between the permanent magnets of the stator and the permanent magnets have a parallelogram shape, the attached small pieces can be easily removed.

(Second embodiment)

FIG. 3 is a plan view of a field pole showing a second embodiment of the present invention, and FIG. 4 is an enlarged plan view of the permanent magnet of FIG. In the figure, 2b is a permanent magnet unit. In this embodiment, multipole magnetization is performed using two permanent magnets 2a of the first embodiment, and the minimum unit is two magnetic poles. . This simplifies the work of forming the magnetic pole array.

(Third embodiment)

FIG. 5 is a plan view of a field pole showing a third embodiment of the present invention, and FIG. 6 is an enlarged plan view of the permanent magnet of FIG. In the figure, 2c is a permanent magnet unit. In this embodiment, multipole magnetization is performed using the magnet material having the size of six permanent magnets 2a of the first embodiment, and the minimum unit is a set of six magnetic poles. . This further simplifies the operation of forming the magnetic poles. In the present embodiment, the case where the field pole is on the fixed side and the armature is on the movable side has been described. Conversely, the field pole may be on the movable side and the armature may be on the fixed side. Also, the size of the permanent magnet unit has been described for two sets and six sets. However, the size is not limited to this and can be any number.

[Industrial applicability]

As described above, the present invention is suitable for a linear motor having an inexpensive stator, in which small pieces attached to the permanent magnet of the field pole can be easily removed, and the number of assembly steps is small.

Claims

The scope of the claims

1. A field pole in which a plurality of permanent magnets are arranged linearly alternately on the yoke surface in a linear manner, and a slot of an armature core having teeth and a slot through a gap in the field pole. A linear motor, comprising: an armature comprising an armature winding wound with a coil, wherein the permanent magnet of the field pole is formed in a parallelogram shape.

2. A field pole in which a plurality of permanent magnets are linearly arranged alternately on the yoke surface, and a slot of an armature core having teeth and slots through a gap in the field pole. A linear motor having an armature formed of an armature winding wound with a coil, wherein the permanent magnets are multipolar magnetized on an integral parallelogram-shaped permanent magnet material corresponding to a plurality of permanent magnets. A linear motor characterized by a permanent magnet unit that performs the above.