JPS598146B2 - How to make a magnetic pole group for a linear pulse motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a linear pulse smoke magnetic pole group whose drive is controlled based on the correlation between the magnetic flux from a permanent magnet and the magnetic flux generated by excitation of a coil wound around the magnetic poles. It is something.

In general, linear pulse motors are suitable for accurate positioning of heads of quiwriters, printers, etc., or for NC control of machine tools, since they can obtain a moving amount of a movable element proportional to the number of pulses applied to the motor.

By the way, to explain the 1-1t configuration of this linear pulse motor according to the principle shown in FIG. As shown in the figure, they are bridged by permanent magnets 4 at 5/4 pitches, and coils 5 and 6 are wound around each magnetic pole 2a, 2b, 3a and 3b according to the winding direction shown in the figure.

By applying excitation to the coils 5 and 6 by one of the methods such as 1-phase excitation, 2-phase excitation, and l-2 phase excitation, the pitch of 1/2, for example, 1/2, is applied each time the excitation is switched.
The movable element side including the iron cores 2 and 3 is driven by 4 pitches at a time.

By the way, when this moke is generally used for positioning, it is required to make the amount of movement per pulse as small as possible in order to increase the positioning resolution.

For this reason, it is required that the pitch of the teeth of the scale and slider used in the linear pulse motor be as small as possible.

For this reason, the tooth pitch on the movable element side is difficult to achieve accuracy because multiple magnetic pole bodies are formed separately and then assembled together with permanent magnets, etc., and a large number of teeth are formed on the magnetic pole surface. The disadvantage was that the number of man-hours required to perform the work was significantly increased.

That is, each magnetic pole 10a, 10b of the magnetic pole body 10 shown in FIG.
However, it is difficult and laborious to form the tooth portions 10a, 10b+ accurately.
．． Even if 10b1 is formed, it is difficult to maintain an appropriate tooth spacing in a magnetic pole group in which two magnetic pole units 10 are assembled with a bridge of permanent magnets.

The purpose of this invention is to make processing easier and more accurate based on the process of gluing a slit plate made of magnetic material with precise teeth formed on the surface of each magnetic pole after assembling magnetic poles for linear pulse smoke, and cutting the ends. The purpose is to obtain magnetic pole teeth that are as follows.

Hereinafter, the manufacturing method according to the present invention will be specifically explained based on the drawings.

FIG. 3 shows the slit plate according to the present invention, FIG. 4 shows the basic configuration of a mover magnetic pole group obtained by combining magnetic pole bodies, and FIG.
The figure shows a group of magnetic poles of a mover obtained by the method according to the invention.

First, the slit plate 11 shown in FIG. 3 has a predetermined number of teeth 11a formed at positions facing the surface of each magnetic pole.

The slit plate 11 is formed by punching, or by applying photoresist to the periphery 'flb and the teeth 11a, and chemically etching the remaining parts, which is called photo-etching. .

Therefore, as long as the punching die material or the resist is created correctly, the teeth 11a can maintain a proper positional relationship with respect to the scale teeth (not shown).

On the other hand, the mover magnetic pole group shown in FIG.
2b each has two magnetic poles 12a+, 12a2, 1
2b,, 12b2 are formed.

Next, each of these magnetic pole bodies 12a, 12b is attached to a contact plate 13a.
, 13b, and are integrally connected at substantially constant intervals.

However, the back surfaces of each of the magnetic pole bodies 12a and 12b are bridged by a permanent magnet (not shown).

Now, each magnetic pole 12 of the mover magnetic pole group shown in FIG.
The slit plate 11 is opposed to each magnetic pole surface of a, 1 2a2, 1 2b, 12b, .

At this time, the teeth 1 for each magnetic pole in the longitudinal direction of each magnetic pole surface.
1a (In the example, three teeth are arranged for each magnetic pole.

) so that their longitudinal directions are parallel to each other.

Next, three teeth 11a are attached to each magnetic pole 12a, ,
1 2a2 , 12b, , 1 2b, , are bonded with adhesive.

When the slit plate 11 is cut along the lines L, , and L2 shown in FIG.
Both ends of the toothed portion 11a are separated, and the mover magnetic pole body as shown in FIG. 5 is finally completed.

In the magnetic pole group for linear pulse smoke operated in the above process, a plurality of teeth 11a are bonded to the surface of each magnetic pole, but these teeth are attached as shown in FIG. 3 after all the magnetic pole basic bodies are assembled. This is obtained by joining the slit plates shown in the correct orientation.

Therefore, even if there is some error in the relative position of each magnetic pole on the magnetic pole base body, this error is completely compensated for and the optimum state (state determined at the time of design) is achieved for the teeth on the scale side (not shown). Can be made to face each other.

As described above, the magnetic pole group of the linear pulse smoke obtained based on the manufacturing method according to the present invention has integrally assembled tooth portions with predetermined mutual spacing on each magnetic pole base body assembled integrally. The formed slit plates were joined together with the tooth portions oriented in a constant direction with respect to the magnetic poles, and the slit plates were cut along cutting lines L1 and L2 that included both ends of each tooth portion of the slit plate.

Therefore, the number of processing steps for mass production of magnetic pole groups for linear pulse motors is significantly reduced, and there is no room for consideration of tooth arrangement errors, among other excellent features.

[Brief explanation of the drawing]

Fig. 1 is a diagram of the principle of linear pulse smoke, Fig. 2 is a perspective view of a magnetic pole body for configuring a conventional magnetic pole group, Fig. 3 is a perspective view of a slit plate that forms the gist of this invention, and Fig. 4 is FIG. 5 is a perspective view of a magnetic pole basic body showing one manufacturing process of the present invention, and a front view of a magnetic pole group completed according to the present invention. 11... Slit plate, 11a... Teeth, 12a, 12b... Magnetic pole body, 12a, 12
a2, 1 2b,, 12b2...Magnetic pole, 13a
,13b...Packing plate,L,,L2...
cutting line.

Claims (1)

[Claims] 1 A plurality of magnetic pole base bodies are assembled integrally, and a slit plate with teeth formed at a predetermined interval relative to the magnetic pole surface of each magnetic pole base body is opposed so that the teeth are parallel to the center line of the magnetic pole base body. 1. A method for manufacturing a linear pulse smoke magnetic group, characterized in that the slit plate is cut along a line along both ends of the teeth.