JPH08191564A - Linear motor - Google Patents

Abstract

PURPOSE: To easily clean and eliminate scraps on the salient pole arrangement surface part of a secondary side member. CONSTITUTION: In a linear motor with a combtooth-shaped secondary side member 7 where a plurality of salient poles 9 are provided at a specific pitch on the opposite surface part with a primary side member 3, a filling member 13 according to a low permeability material is filled into a recessed part 11 between the salient poles 9 and the salient pole arrangement surface part of the secondary side member 7 is, as a whole, formed as a smoothing surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motor,
In particular, the present invention relates to a linear pulse motor or other linear motor having a comb-shaped secondary member.

[0002]

2. Description of the Related Art Generally, a secondary member of a linear pulse motor is made of a magnetic material such as carbon steel,
It has a comb-like shape with a plurality of salient poles provided at a certain pitch on the surface facing the primary side member, and the magnetic field lines from the primary winding or permanent magnets provided on the primary side member are selectively applied to each salient pole. A magnetic field is generated by being exerted on the magnetic field and acts as a secondary conductor to generate thrust between the primary side member.

[0003]

When the linear pulse motor as described above is used as a linear feed drive device for a machine tool, the salient pole arrangement surface portion, that is, the surface portion facing the primary side member is the upper surface and the secondary side member is the upper surface. Chips generated by cutting in a machine tool when fixedly placed on the bed and the primary side member is attached to the bottom bottom surface of the table to be a mover.
Chips and other foreign substances fall into the recesses between the salient poles and collect in these recesses.

When chips, chips, and other foreign matter accumulate in the recesses, the adjacent salient poles are magnetically short-circuited, the amount of heat generated in the secondary member increases, and the energy loss increases, which causes the operation of the linear pulse motor. Since the performance deteriorates, the chips and chips must be removed from the recesses promptly. However, since the groove width of the recess is as small as a few mm, and there are many recesses, cleaning work to remove chips, chips, etc., that have entered the recess from each recess is extremely troublesome and time-consuming. Become.

The present invention has been made by paying attention to the above-mentioned problems, and a chip on the salient pole arrangement surface portion of the secondary side member,
Even if the chips fall off, you can easily remove them
Further, it is an object of the present invention to provide an improved linear motor in which the salient pole disposition surface portion is automatically cleaned each time the linear operation is performed and the stable linear operation performance is always exhibited.

[0006]

In order to achieve the above-mentioned object, a linear motor according to the present invention has a comb-shaped two-piece structure in which a plurality of salient poles are provided at a predetermined pitch on the surface facing the primary member. In a linear motor having a secondary member,
The recesses between the salient poles are filled with a filling member made of a low magnetic permeability material, and the salient pole disposition surface portion of the secondary side member is a smooth surface as a whole.

In the linear motor according to the present invention, the filling member may be made of synthetic resin poured into the concave portion between the salient poles.

Further, in the linear motor according to the present invention, the primary side member or the holding member of the primary side member is provided with a cleaning wiper made of an elastic body which is in sliding contact with the salient pole arrangement surface portion of the secondary side member. Is a detailed feature.

[0009]

According to the above-mentioned structure, since the recesses between the salient poles are filled with the filling member, the salient pole arrangement surface portion, which is the surface portion facing the primary side member of the secondary side member, becomes a smooth surface as a whole. As a result, chips and chips do not fall into the recess. As a result, the cleaning for removing chips and chips from the salient pole arrangement surface portion can be easily and reliably performed at once by a blade-shaped wiper, scraper, etc. because the cleaning surface is a smooth surface. Like

Since the filling member is made of a low-permeability material, the magnetic isolation between the adjacent salient poles is stably maintained by the filling member.

Since the filling member may be made of synthetic resin poured into the concave portion between the salient poles, it is not difficult to manufacture the secondary member.

Further, since the primary side member or the holding member of the primary side member is provided with a cleaning wiper made of an elastic body which is in sliding contact with the salient pole disposition surface portion of the secondary side member, each time the linear motor is linearly operated, Cleaning of the salient pole placement surface is automatically performed in a sweeping manner.

[0013]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

1 and 2 show an embodiment of a linear motor according to the present invention. The linear motor is composed of a primary side member 3 attached to the table 1 and a secondary side member 7 fixedly attached to the bed 5.

The primary side member 3 is attached to the lower bottom surface and the vertical surface of the table 1, respectively, and the secondary side member 7 is fixedly attached to the upper surface and the vertical surface of the bed 5, respectively. The members 7 face each other with a predetermined gap therebetween.

The secondary side member 7 is made of a magnetic material such as carbon steel, and a plurality of salient poles 9 are provided on the surface facing the primary side member 3 at equal intervals in the linear movement direction, and comb teeth are formed. I am in a shape.

The recesses 11 between the salient poles 9 are filled with a filling member 13 made of a low magnetic permeability material, and the salient pole disposition surface portion of the secondary side member 7 is a smooth surface as a whole.

As the low magnetic permeability material forming the filling member 13, vinyl chloride, polyethylene, polypropylene, polystyrene, AS resin, polyamide, polycarbonate, polysulfone, polyacrylate, polyimide,
Examples include thermoplastic resins such as fluorine-based resins, thermosetting resins such as phenolic resins, and ceramics.

As a material forming the filling member 13, it is more preferable that the magnetic permeability is close to that of air, the mechanical strength and the abrasion resistance are good, and the surface friction resistance is small. Examples of the resin include fluorine-based resins.

The surface of the filling member 13 may be coated with a different functional material such as a fluorine resin.

The filling member 13 may be fitted by mounting a preformed one according to the shape of the recess 11, but in the case of a synthetic resin such as a thermoplastic resin, the filling member 13 is of an insert molding type by being poured into the recess 11. Alternatively, the recess 11 may be filled.

Therefore, the term "filling" as used herein includes the case where the preformed filling member 13 is fitted into the recess 11 and mounted.

In the present invention, what is important is the filling member 1.
3 and the salient pole 9 are flush with each other, and if strict flushness is required, after the filling member 13 is filled in the concave portion 11, the salient pole arrangement surface portion of the secondary side member 7 is It should be plane cut.

A cleaning wiper 15 made of an elastic body is attached to the table 1 so as to be in sliding contact with the salient pole arrangement surface portion of the secondary member 7. The cleaning wiper 15 is made of isoprene rubber,
It is made of rubber elastic material such as butadiene rubber, butyl rubber, nitrile butadiene rubber, polysulfide rubber, silicone rubber, thermoplastic elastomer, and preferably has excellent oil resistance and abrasion resistance so that it is not deteriorated by lubricating oil. Excellent rubber elastic material, such as silicone rubber,
It is composed of thermoplastic elastomer.

As described above, since the filling member 13 is filled in the concave portion 11 between the salient poles 9, the salient pole arrangement surface portion, which is a surface portion facing the primary member 5 of the secondary member 7, is smooth as a whole. It becomes a surface and chips and chips are prevented from falling into the recess 11.

As a result, in the cleaning for removing chips and chips from the salient pole arrangement surface portion, since the cleaning surface is a smooth surface, a blade-shaped wiper, scraper, etc. can be used at once in a good workability, easily and reliably. Can be done.

Since the filling member 13 is made of a low magnetic permeability material such as synthetic resin, the magnetic isolation between the adjacent salient poles 9 is stably maintained by the filling member 13, and the filling member 13 has the performance of the linear motor. It does not lower.

Also, every time the linear operation of the linear motor is performed, that is, each time the table 1 moves, the cleaning wiper 15 slides on the surface of the salient pole on which the tip of the secondary member 7 is smooth, so that the secondary member is moved. Automatically clean the salient pole arrangement surface of 7 by brushing off. As a result, even if chips, chips, etc. fall on the salient pole disposition surface portion of the secondary side member 7, they do not collect on the salient pole disposition surface portion and are provided on the table 1 at the same time. It is also possible to prevent chips, chips and the like from invading the arrangement portion of.

As a result, the operational stability and reliability of the linear motor are improved.

In the above, the present invention has been described in detail with respect to a specific embodiment, but the present invention is not limited to this, and various embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art.

[0031]

As can be understood from the above description, according to the linear motor of the present invention, the concave portion between the salient poles is filled with the filling member, and the protrusion is the surface portion of the secondary side member facing the primary side member. Since the pole arrangement surface part is a smooth surface as a whole,
There is no risk that chips, chips, etc. will fall into the recesses, and cleaning to remove chips and chips from the salient pole arrangement surface part can be done easily at once with a blade-like whipper, scraper, etc. against a smooth surface, Moreover, it can be surely performed.

Since the filling member is made of a low magnetic permeability material, the magnetic isolation between adjacent salient poles is stably maintained by the filling member, and the filling member does not deteriorate the performance of the linear motor.

Since the filling member may be made of synthetic resin poured into the concave portion between the salient poles, the concave portion between the salient poles is surely filled with the filling member, and it may be difficult to manufacture the secondary member. In addition, the manufacturing cost of the secondary member does not soar.

Further, since the primary side member or the holding member of the primary side member is provided with a cleaning wiper made of an elastic body which is in sliding contact with the salient pole disposition surface portion of the secondary side member, each time the linear motor is linearly operated, The salient pole arrangement surface is automatically cleaned in a sweeping manner, and even if chips, chips, etc. fall on the salient pole arrangement surface of the secondary member, special cleaning work is required by the operator. Since these do not accumulate on the salient pole arrangement surface portion, the operation stability and reliability of the linear motor are improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a linear motor according to the present invention.

FIG. 2 is a sectional view showing an embodiment of a linear motor according to the present invention.

[Explanation of symbols]

 1 Table 3 Primary Side Member 5 Bed 7 Secondary Side Member 9 Salient Pole 11 Recess 13 Filling Member 15 Cleaning Wiper

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuharu Katsuharu 2068-3 Ooka, Numazu City, Shizuoka Prefecture, Numazu Works, Toshiba Machine Co., Ltd. (72) Sanae Tashiro 2068-3 Ooka, Numazu City, Shizuoka Prefecture, Numazu Business, Toshiba Machine Co., Ltd. In-house (72) Inventor Satoshi Kumamoto 2068 Ooka, Numazu City, Shizuoka Prefecture Numazu Works, Toshiba Machine Co., Ltd.

Claims (3)

[Claims] 1. A linear motor having a comb-teeth-shaped secondary side member having a plurality of salient poles provided at a predetermined pitch on the surface facing the primary side member, wherein a low-permeability material is provided in the concave portion between the salient poles. The linear motor is characterized in that the filling member is filled and the salient pole arrangement surface portion of the secondary member is a smooth surface as a whole. 2. The linear motor according to claim 1, wherein the filling member is made of synthetic resin poured into the concave portion between the salient poles. 3. A cleaning wiper made of an elastic body, which is provided on the primary side member or a holding member of the primary side member, is in sliding contact with a salient pole disposition surface portion of the secondary side member. The linear motor according to 1 or 2.