JPH0851759A - Linear motor for conveyance - Google Patents

Abstract

PURPOSE:To cool a polyphase coil efficiently without sacrifice of the performance of linear motor by providing cooling air straighteners coupled with a cooling fan at one or opposite ends of a stator. CONSTITUTION:The linear motor is provided, at right end of the stator 20, with a cooling air straightener 70 to be coupled with an air supply duct 8 from a cooling fan 7. Cooling air is fed from the cooling fan 7 through the air supply duct 8 and the cooling air straightener 70 and blown efficiently onto the surface of each coil in a polyphase coil 2 ananged on a support member 4 thus cooling the surface of the polyphase coil 2 heated through conduction of driving current. Since the surface of heated polyphase coil can be cooled efficiently with cooling air fed from a single cooling fan, the cost can be reduced and since the cooling fan is not mounted in a mover, performance of the linear motor is not deteriorated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling means for an armature coil (multi-phase coil) in a linear motor for conveyance of a type in which a permanent magnet and an armature coil (multi-phase coil) are relatively moved. It is a thing.

[0002]

2. Description of the Related Art Conventionally, a plurality of permanent magnets are magnetized so that adjacent magnetic poles are different from each other and the polarities of the different magnetic poles are opposed to each other and are fixedly arranged on a yoke through a magnetic gap. A magnet and a polyphase coil provided in this magnetic gap are provided, and by supplying a drive current to the polyphase coil,
A linear motor configured to relatively move the permanent magnet and the polyphase coil is well known.

In this type of linear motor, a structure in which a thrust is applied to the mover by energizing the multiphase coils with a drive current as described above is often used. There is a problem that the coil surface generates heat. As a means for solving this problem, for example, in a movable magnet type linear DC motor, a part of the yoke for closing the magnetic path of the field magnet is removed, and the yoke part where the field magnet is not disposed is transparent. There is a method (Japanese Patent Laid-Open No. 6-165472) in which a hole is formed and a cooling fan is arranged to send cold air to the stator armature side through the through hole. Further, for example, in Japanese Patent Laid-Open No. 6-165474, in a movable magnet type DC linear motor, a mover composed of a field magnet and a yoke is divided, and a cooling fan for sending air to the coreless stator armature side between the divided movers. A method of arranging is described.

[0004]

However, in the above-mentioned conventional linear motor, since the cooling fan is arranged in a part or an intermediate portion of the mover, the weight of the cooling fan and the weight of the wiring are reduced. As a result of being added to the mover, there is a problem that the linear motor performance deteriorates.
Further, since a space between the field magnet and the yoke is required as a space for installing the cooling fan, there is a problem that the magnet (magnetic flux) density is lowered. Further, since a plurality of cooling fans are required, there is a problem that cost reduction and size reduction cannot be achieved.

The present invention has been made in view of the above-mentioned problems of the prior art. An object of the present invention is to dispose the yoke and the permanent magnet in a mover, and to drive the armature coil for driving. In a linear motor of a system in which a (polyphase coil) is arranged on a stator to move the two relatively, an inexpensive linear motor that can cool the polyphase coil efficiently without impairing the linear motor performance is provided. To provide.

[0006]

To achieve the above object, in the first invention of the present invention, adjacent magnetic poles are magnetized differently from each other, and polarities of different magnetic poles are opposed to each other. , A plurality of permanent magnets fixedly arranged on the yoke via a magnetic gap, and a multi-phase coil provided in the magnetic gap, and by supplying a drive current to the multi-phase coil, In a linear motor configured to relatively move a mover having a yoke and the permanent magnet and a stator having the polyphase coil, cooling at one end or both ends of the stator The technical means of providing a cooling air rectifying member connected to the cooling fan was adopted.

In the second aspect of the present invention, adjacent magnetic poles are magnetized so that they are different from each other, and the polarities of the different magnetic poles are opposed to each other, and the magnetic poles are fixed to the yoke through a magnetic gap. A plurality of permanent magnets and a multi-phase coil provided in the magnetic gap, and a driving current is passed through the multi-phase coil to arrange the yoke and the permanent magnet. And a linear motor configured to relatively move the stator provided with the polyphase coil, for cooling to rectify cooling air from a cooling fan to one end or both ends of the mover. The technical means of providing an air straightening plate was adopted.

In the present invention, it is preferable that one end or both ends of the stator be sharpened.

As the yoke material used in the present invention, known soft magnetic materials can be used. For example, pure iron, soft iron, ordinary steel such as carbon steel and low alloy steel, special steel for construction, tool steel,
Well-known steel materials such as ferritic and martensitic stainless steels, iron-based castings such as cast iron and cast steel, and Mn
-Known ferrite such as -Zn ferrite and Fe-Ni alloy such as permalloy, Fe-N such as Kovar
One or more kinds of i-Co alloys and so-called resin-bonded soft magnetic materials mainly composed of these known soft magnetic material powders and polymer compounds can be preferably used. And among these, SS41 and S45
One or more carbon steels such as C and SPC can be particularly preferably used.

As the permanent magnet material used in the present invention, a permanent magnet manufactured by a known manufacturing method (eg, sintering method, casting method, ultra-quenching method, bond magnet method, etc.) can be used. Then, the general formula R-Fe-B system and R-Co ₅ system representing the basic composition as a permanent _magnet, R ₂ chromatography Co ₁₇ system (R is one of the rare earth elements including Y or 2
Or more, and if necessary, Co, Al, Nb, Ga,
One or more known additive elements effective for magnetic properties such as Fe, Cu, Zr, Ti, Hf, Ni, and Si, and one or two unavoidable impurity elements such as O, C, H, and N. The above can be contained. 1) or 2 or more kinds of known permanent magnet materials such as rare earth magnets and ferrite magnets, alnico magnets, Mn-Al-C magnets, etc. Of these, the R—Fe—B system sintered magnet can be particularly preferably used.

[0011]

According to the present invention, the weight of the movable element mounted is increased by providing the cooling air rectifying member and the cooling air rectifying plate which are connected to the cooling fan on one side or both sides of the stator or the movable element. As a result, it is possible to efficiently cool the polyphase coil while maintaining the performance of the linear motor.
Further, it is not necessary to provide a space for arranging the cooling fan in the mover, and it is not necessary to dispose a plurality of cooling fans, which is advantageous in reducing the cost. .

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment for explaining a cooling member provided at a stator end of a linear motor according to the present invention. As shown in the figure, a cooling air rectifying member 70 (made of SUS-304, which is connected to a blower duct 8 provided with a cooling fan 7 at the right end of the stator 20 and has an opening 70a of 180 mm × 30 mm). There is). Then, the cooling air generated by the cooling fan 7 and passing through the blower duct 8 is efficiently blown onto each coil surface of the multi-phase coil 2 arranged on the support member 4 via the cooling air rectifying member 70. By doing so, the surface of the multiphase coil 2 that has generated heat due to the supply of the drive current can be efficiently cooled.

FIG. 2 is a main part arrow view in the direction A in FIG. 1, in which the cooling air rectifying member 70, the air duct 8 and the cooling fan 7 are omitted. As shown in FIG. 2, a plurality of permanent magnets 1 (Nd-Fe-B based sintered magnet, HS-37BH manufactured by Hitachi Metals, Ltd.) are arranged so that the polarities of adjacent magnetic poles are different from each other. York 3 (SS4
It is fixed to 1). The permanent magnet 1 and the yoke 3
Is provided so as to be movable in a direction parallel to the paper surface. Then, a support member 4 (made of epoxy resin) to which the multiphase coil 2 is fixed is arranged in the magnetic gap of the pair of permanent magnets 1 facing each other. The support member 4 is fixed to a pedestal 6 (made of SUS304) via a column 5 (made of SUS304). In addition,
The right end portion (the support member sharpened portion 9) of the support member 4 has a sharpened shape in order to reduce the blowing resistance of the cooling air.

Then, by switching the currents flowing through the coils of the polyphase coil 2 fixed to the support member 4,
The mover 10 composed of the permanent magnet 1 and the yoke 3 can move in the above-mentioned direction with a constant thrust. The switching of the drive current of the multiphase coil 2 is performed based on a known detection signal means such as a magnetic detection element. In this way, the mover 10 having the yoke 3 moves when the yoke 3 to which the permanent magnet 1 is fixed moves.

Next, the structure of the polyphase coil 2 and the support member 4 will be described. FIG. 3 is a diagram showing a state in which the polyphase coil 2 is fixed to the support member 4. A coil 2 is molded by winding a conductor wire covered with an insulator, and the coil 2 is fixed to the surface of the support member 4 with an epoxy adhesive (mixture of AV138 and HV998). The support member 4 is made of epoxy resin which is a non-magnetic material as described above. As the non-magnetic material forming the support member 4, other than the above-mentioned epoxy resin,
For example, thermosetting resin such as silicone resin, thermoplastic resin such as 12 nylon, non-magnetic metal material such as aluminum, aluminum alloy, Be-Cu alloy, austenitic stainless steel, for example, composite sintered body of AlN and BN. One or more known non-magnetic materials such as non-magnetic ceramics composed of the above can be preferably used.

FIG. 4 shows another embodiment of the linear motor according to the present invention. In FIG. 4, the air rectifying plate 30 for cooling (made of SUS304 and the size of the opening 30a is 100 mm × 50 mm) is provided at both ends of the mover 10. 4, reference numerals that are the same as those in FIG. 1 indicate the same components as those in FIG. In FIG. 4, an air rectifying plate 3 for cooling the mover 10 is provided from the cooling fan 7 through the air duct 8.
The cooling air that has reached around 0 is focused and blown into the gap between the stator 20 and the mover 10 by the opening 30a, and as a result, the surface of the multiphase coil 2 that has generated heat is efficiently cooled as in the embodiment of FIG. can do. The air duct 8
Is divided into two paths to divide the openings 30 on both sides of the mover 10.
If cooling air is blown to a, the cooling effect is further improved.

In the embodiment of the present invention (FIG. 1), an example in which the cooling air rectifying member 70 is arranged at one (right) end of the stator 20 has been described. You may arrange | position at both ends. In the case of providing both ends, for example, if the air duct 8 is branched into two paths and connected to the cooling air rectifying members 70 provided at both ends of the stator 20, both ends of the stator 20 are connected. It can be cooled and the cooling capacity can be further improved. Further, in another embodiment of the present invention (FIG. 4), the case where the air rectifying plates 30 for cooling are arranged on both sides of the mover 10 is shown. You can get enough. Further, in the present invention, a cooling air rectifying member connected to a cooling fan is provided on one side or both sides of the stator, and for rectifying the cooling air from the cooling fan on one side or both sides of the mover. A side-by-side configuration in which a cooling air straightening plate is provided may be adopted.

[0018]

According to the present invention, the surface of the multiphase coil which has generated heat can be efficiently cooled only by the cooling air by one cooling fan, and it is not necessary to install a plurality of cooling fans, so that it is inexpensive. is there. Since the cooling fan is not installed in the mover, the linear motor performance does not deteriorate. It is not necessary to provide a space for mounting a cooling fan in the mover,
This is advantageous for improving the performance of linear motors. It has an extremely useful effect on the industry.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment for explaining a cooling member provided at a stator end of a linear motor according to the present invention.

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

FIG. 3 is a diagram showing a configuration of a polyphase coil and a support member according to the present invention.

FIG. 4 is a diagram showing an embodiment for explaining a cooling air rectifying plate provided at a mover end of a linear motor according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Permanent magnet, 2 coil, 3 yoke, 4 support member, 5 support | pillar, 6 pedestal 7 Cooling fan, 30 Cooling air straightening plate, 70 Cooling air straightening member.

Claims (3)

[Claims] 1. A plurality of permanent magnets fixedly arranged on a yoke via a magnetic gap so that adjacent magnetic poles are magnetized differently from each other and the polarities of the different magnetic poles face each other.
A multi-phase coil provided in the magnetic gap, and by supplying a drive current to the multi-phase coil, the mover in which the yoke and the permanent magnet are arranged and the multi-phase coil are provided. In a linear motor configured to move the disposed stator relatively, one or both ends of the stator are provided with a cooling air rectifying member that is connected to a cooling fan. motor. 2. A plurality of permanent magnets fixedly arranged on a yoke via a magnetic gap so that adjacent magnetic poles are magnetized differently from each other and the polarities of the different magnetic poles are opposed to each other.
A multi-phase coil provided in the magnetic gap, and by supplying a drive current to the multi-phase coil, the mover in which the yoke and the permanent magnet are arranged and the multi-phase coil are provided. In a linear motor configured to move the disposed stator relative to each other, a cooling air rectifying plate for rectifying cooling air from a cooling fan is provided at one or both ends of the mover. A linear motor for transportation. 3. The linear motor for conveyance according to claim 1, wherein one end or both ends of the stator is sharpened.