JPH06165474A - Moving-magnet type linear dc motor - Google Patents

Abstract

PURPOSE:To obtain a moving magnet type linear DC motor, in which thrust is increased by reducing the weight of a moving piece and lightening a load burden, from which smooth thrust ripple characteristics are acquired and in which reliability is improved by cooling a core-less stator armature. CONSTITUTION:A magnet yoke 8 of a moving piece 3 is divided and formed, and field magnets 6A, 6B are installed to each of split magnet yokes 8A, 8B, thus forming split moving pieces 3A, 3B. The field magnets 6A, 6B are arranged and shaped while phase is displaced mutually in the direction of movement of the moving piece 3 by a distance of approximately (1+1/8)lambda width respectively from the field magnet of another split moving piece in the split awing pieces 3A, 3B, and cooling fans 13 blasting air to the core-less stator armature 2 side are mounted between the split moving pieces 3A, 3B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention aims to improve thrust by reducing the weight of a moving element to reduce the load load, obtain smooth thrust ripple characteristics, and cool a coreless stator armature. The present invention relates to a movable magnet type linear DC motor with high reliability.

[0002]

2. Description of the Related Art FIGS. 5 to 7 show a conventional multi-pole / multi-phase movable magnet type linear DC brushless motor 1-1, which will be described below. In this movable magnet type linear DC brushless motor 1-1, a coreless stator armature 2-1 is arranged on a linear motion guide rail 9 which constitutes a stator, and a roller 10 runs along the linear motion guide rail 9. The mover 3-1 is configured to move linearly.
The roller 10 is rotatably attached to a side plate formed by extending and bending a side surface of a magnet yoke 8-1 described later. It is assumed that all the magnet yokes shown below have such a structure, and detailed description thereof and part of the drawings are omitted. When the linear motion guide rail 9 is made of a magnetic material to close the magnetic path of the field magnet 6-1 described later, the linear motion guide rail 9 has a magnetic path of the field magnet 6-1 on the surface of the linear motion guide rail 9. It is not necessary to provide the stator yoke 11-1 for closing the. But,
In this linear DC brushless motor 1-1, a long plate-shaped stator yoke 11 is arranged on the surface of the linear guide rail 9, and the stator yoke 11-1 is surface-insulated. Type armature coils 5 groups mover 3-
The coreless stator armature 2-1 is formed by arranging the coreless stator armatures 2-1 at appropriate intervals along the longitudinal direction thereof.

A long plate-shaped printed wiring board 4-1 having through holes 7-1 for passing cold air is formed at a plurality of positions on the armature coil group 5 and a field magnet described later is provided. The coreless stator armature 2-1 is protected by being opposed to 6-1. Explaining the armature coil 5, the armature coil 5 in this example is formed by winding a large number of turns of a conductive wire so as to be a rectangular frame-shaped air-core type coil. It may be formed by a sheet coil or the like using an etching means.

According to the air-core type armature coil group 5 as described above, the linear reciprocating 180-degree energization method with good efficiency and performance is extended in the direction orthogonal to the traveling direction of the moving element 3-1. The open angle between the two effective conductor portions 5a and 5a contributing to the generation of the thrust is the N pole, S in the traveling direction of the mover 3-1 of the field magnet 6-1 described later.
The winding is formed so as to have an opening angle of one pole width T of the pole.

In the armature coil 5, the mover 3-
The two conductor portions 5b parallel to the moving direction of 1 are conductor portions that do not contribute much to the generation of thrust.

In the armature coil 5, the two conductor portions 5b that do not contribute much to the generation of the thrust and the length to the outside of the conductor portion 5b are substantially equal to the width of the field magnet 6-1 in that direction. To form.

On the printed wiring board 4-1, magnetic pole discrimination for position detection for switching energization of the armature coil 5 group according to the magnetic pole states of the armature coil 5 group and the field magnet 6-1 is performed. Elements (not shown) are arranged, power is supplied to the armature coil 5 and the magnetic pole discrimination element, and a conductive wiring pattern (not shown) for obtaining an output signal is formed.

As the magnetic pole discriminating element, a Hall IC,
An appropriate magnetoelectric conversion element such as a Hall element or a magnetoresistive element may be used.

The magnetic pole discrimination elements are armature coils 5 respectively.
Of the conductor portion 5a that contributes to the thrust generated by the conductor and the conductor portion 5 that is formed orthogonal to the conductor portion 5a and that does not significantly contribute to the generation of the thrust.
The field magnet 6-1 is disposed at a position of the surface of the printed wiring board 4-1 opposite to the position of the conductor portion intersecting with b.
The magnetic poles of the N pole and the S pole of are to be detected.

A driver in an energization control circuit (not shown) operates based on an output signal from the magnetic pole discriminating element corresponding to the magnetic poles of the N pole and the S pole of the field magnet 6-1 to generate thrust in a predetermined direction. The armature coil group 5 is energized in an appropriate direction so as to be generated.

The mover 3-1 is provided with a field magnet 6-1 on the inner surface of the lower portion of the long plate-shaped magnet yoke 8-1 facing the stator armature 2-1. It is configured to move linearly relative to -1.

On the inner surface of the lower portion of the magnet yoke 8-1,
The magnetic poles of the N pole and the S pole, which are formed in the T width so that the magnetic poles adjacent to each other along the moving direction of the mover 3-1 have different poles,
(P is an integer of 2 or more) 10-pole field magnets 6-1 formed adjacently at equal intervals (in FIGS. 5 and 7, for convenience of drawing, a 5-pole field magnet 6-1 is drawn. Exist)
Is fixed using an appropriate means such as an adhesive.

An axial fan motor mounting portion 12 is formed by extending and bending on one side surface of the stator yoke 11-1. The axial fan motor mounting portion 12 has a through hole (not shown) for mounting a DC axial fan motor 13 used as a cooling fan described later.

The through holes of the axial fan motor mounting portion 12 and the through holes 15 formed in the corner flanges at the two corners of the DC axial fan motor 13 are aligned and the DC axial fan motor 13 is screwed. Vertically installed.

In the movable magnet type linear DC brushless motor 1-1 having the above-mentioned structure, by rotating the DC axial flow fan motor 13, cold air is blown from the side surface of the coreless stator armature 2-1 to cause the coreless stator. The armature 2-1 can be cooled.

However, when the DC axial fan motor 13 is attached, the coreless stator armature 2-1 is cooled by applying cold air from the side surface of the coreless stator armature 2-1 to the coreless stator armature 2-1. Although (heat generation prevention) can be achieved, in order to sufficiently cool the armature coil group 5, the armature coils 5 must be arranged apart from each other in the moving direction of the moving element 3-1. Since only a small number of armature coils 5 can be arranged per unit area, it is not so preferable in terms of thrust force and thrust ripple characteristics.

Further, since the DC axial fan motor 13 is installed on one side surface position of the stator armature 2-1 facing the field magnet 6-1, the DC axial fan motor 13 is attached to a large extent. If it is not made rigid, there is a drawback that a large vibration noise is generated by the DC axial fan motor 13.

When the linear DC brushless motor 1-1 having a long stroke characteristic is formed, the mover 3-1 is used.
It is necessary to form the coreless stator armature 2-1 long along the longitudinal direction of the coreless stator armature 2-1 according to the method of mounting the DC axial fan motor 13 described above. DC axial fan motor 1
3 must be provided, and there are great restrictions in terms of cost and current.

If the height (air gap) between the magnet yoke 8-1 and the stator yoke 11-1 is not sufficient, the DC axial flow fan motor 13 cannot be installed vertically, and the DC axial flow fan motor 13 is not suitable for it. It is difficult to sufficiently cool the armature coil 5 because there is almost no DC axial fan motor that is small and has a large air flow.

In the movable magnet type linear DC brushless motor 1-1 having the above-described structure, in order to obtain a large thrust force and a smooth thrust ripple, the armature coils 5 are arranged apart from each other in the longitudinal direction. Don't
The coreless stator armature 2 as shown in FIG. 9 arranged adjacent to each other at an equal interval with a pitch of approximately λ (= T + T / 8).
Is desirable to be formed.

When the movable magnet type linear DC brushless motor 1-1 using the coreless stator armature 2 thus formed is formed, the thrust (torque) ripple obtained when the mover 3-1 moves is: It is obtained as shown in FIG.

Explaining further with reference to FIG. 8, the armature coil groups 5 form coreless stator armatures 2 arranged at equal intervals with a λ (= T + T / 8) pitch, and a field magnet 6-. If only 5 poles of 1 are taken up, the field magnet 6-1 is the coreless stator armature 2
When it moves relative to, the thrust ripple curve 17-1 in the above range of λ appears as a rough thrust ripple as shown in FIG.

Since the movable magnet type linear DC brushless motor 1-1 of this kind has a coreless structure and a multi-phase structure, it is extremely smooth as compared with a linear pulse motor or an iron core type linear DC motor. It is used in advanced precision measuring instruments and the like because it has thrust ripple characteristics.

Here, in the movable magnet type linear DC motor used in a device such as a semiconductor manufacturing device which requires higher accuracy, smoother thrust ripple characteristics are required, and the improved coreless stator armature 2 is used. There is a need for a movable magnet type linear DC brushless motor capable of further improving thrust and thrust ripple characteristics as compared with the movable magnet type linear DC brushless motor 1-1.

Therefore, the present inventor makes a slight design change to the movable magnet type linear DC brushless motor 1-1 when the coreless stator armature 2 is used, and the thrust ripple number is larger than that of the conventional one. The movable magnet shown in FIG. 9 has a structure in which the thrust ripple can be suppressed to 1/2 and the moving element can be moved extremely smoothly by doubling the ratio, and the combined thrust characteristics can be improved. Since the linear DC brushless motor 1-2 has already been proposed, this will be described below with reference to FIGS.

In this movable magnet type linear DC brushless motor 1-2, the conductor portion 5 which contributes to thrust like the movable magnet type linear DC brushless motor 1-1.
The open angle width of a and 5a is set to one magnetic pole width T of the field magnet 6-1.
The armature coil 5 formed to have the same width as λ (where λ = T
+ T / 8) coreless stator armature 2 arranged at a width pitch, and conductor portion 5 that contributes to the generation of thrust of armature coil 5.
The magnetic pole discriminating element 19 disposed on the surface of the stator yoke 11 which is an extension of a is held on the fixed side, and is disposed at a position which moves relative to the field magnet 6 described later. Similar to the brushless motor 1-1, the difference is in the configuration of the moving element 3-2 having the field magnet 6.

The mover 3-2 is the magnet yoke 8 described above.
-1 Two sets of field magnets 6A and 6B are provided on the inner lower surface of a long plate-shaped magnet yoke 8-2 similar to (1 + 1).
/ 8) It is arranged and formed with the phase shifted by a distance of λ width (where λ = T + T / 8) in the moving direction of the moving element 3-2.

The two sets of field magnets 6A and 6B have N poles and S poles of approximately T width so that adjacent magnetic poles have different poles.
It is a long plate having five poles formed by arranging poles adjacent to each other, and these poles are arranged at intervals of (1 + 1/8) λ as described above.

In this way, the field magnet 6 is divided into two sets of field magnets 6A and 6B, and the width of one magnetic pole of N pole and S pole of the field magnets 6-1 and 6 is formed to be T width. Therefore, when the width T of one magnetic pole of the N pole and the S pole in the moving direction of the movers 3-1 and 3-2 is set to 30 mm, FIG.
Movable magnet type linear DC brushless motor 1-1
In this case, the field magnet 6-1 has a total length of 300 mm in the longitudinal direction as shown in FIG. 10, whereas the movable magnet type linear DC brushless motor 1-2
In the case of the field magnet 6 in the case of, the two field magnets 6A and 6B are arranged with the width of the above condition: (1 + 1/8) λ, and therefore (1 + 1/8) λ
Width, that is, the total length is 35 mm as shown in FIG.
It will be a long 335 mm.

The magnet yokes 8-1 and 8-2, to which the field magnets 6-1 and 6 are fixed, have their outer ends longer by + α than the field magnets 6-1 and 6-2. To form.

The magnet yoke 8-2 between the two sets of field magnets 6A and 6B is provided with a field magnet positioning member 16 made of a non-magnetic material such as resin, adhesive, copper or aluminum.

A mover 3 having a field magnet 6 composed of two sets of field magnets 6A and 6B as described above.
A development view of the coreless stator armature 2 including the magnetic pole discriminating element 19 group and the armature coil 5 group can be expressed as shown in FIG.

A four-terminal Hall element is used as the magnetic pole discriminating element 19, and two power supply terminals and two output terminals are connected to a control circuit (not shown).

When the power source of the control circuit is closed and the movable magnet type linear DC brushless motors 1-2 are set in an operable state, the N poles and S of the field magnets 6A and 6B are set.
The armature coil 5 facing the field magnets 6A and 6B is energized in a predetermined direction based on the output from the magnetic pole discriminating element 19 that detects the magnetic pole of the pole, and a thrust force in the predetermined direction is generated. Then, the mover 3-2 starts to move in a predetermined direction under the control of signals from an encoder and a control circuit (not shown).

In the case of the movable magnet type linear DC brushless motor 1-2, the two sets of 5-pole field magnets 6A and 6B are approximately (1 + 1/8) λ width (where λ = T + T /
Since the field magnet 6 arranged and formed with the phase shifted by the distance of 8) in the moving direction of the moving element 3-2 is used, the thrust (torque) ripple obtained when the moving element 3-2 moves is It is obtained as shown in FIG.

This will be further described with reference to FIG. 13. Now, the armature coil groups 5 are arranged at equal intervals of λ (T + T / 8) pitch to form the coreless stator armature 2, and the five-pole field is formed. When the magnetic magnets 6A and 6B respectively move relative to the coreless stator armature 2, the thrust ripple curves 17A and 17B obtained by the 5-pole field magnets 6A and 6B in the range of λ are as shown in FIG. Are obtained with a phase shift of (1 + 1/8) λ from each other.

According to the two thrust ripple curves 17A and 17B, the number of ripples is twice that of the thrust ripple curve 17-1 shown in FIG. 8 obtained by the conventional movable magnet type linear DC brushless motor 1-1. Therefore, the thrust ripple curve obtained by combining the two thrust ripple curves 17A and 17B has a smooth thrust ripple characteristic of 1/2 as compared with the conventional thrust ripple curve 17-1 shown in FIG. A movable magnet type linear DC brushless motor 1-2 having an extremely smooth thrust ripple characteristic can be obtained.

Further, as compared with the thrust ripple curve 17-1 shown in FIG. 8 obtained by the conventional movable magnet type linear DC brushless motor 1-1, twice the number of ripples can be obtained, so that two thrust ripple curves 17A, As shown in FIG. 13, the combined thrust curve 18 in which 17B is combined also has a high thrust level, so that the movable magnet type linear DC brushless motor 1 capable of obtaining a larger thrust.
-2 can be obtained.

The movable magnet type linear DC brushless motor 1-2 improved as described above is very useful.

[0040]

However, if the type of the field magnet 6 is changed for the purpose of further improving the performance of the movable magnet type linear DC brushless motor 1-2, depending on the type, In addition to the weight of the field magnet 6, it is necessary to use a thick and heavy magnet yoke 8-2 in order to sufficiently close the magnetic path of the field magnet 6, resulting in a movable magnet type having a large load burden. There is a defect that the linear DC brushless motor 1-2 is used.

Further, the magnet yoke 8-2 is (1 + 1/1 /) more than the magnet yoke 8-1 for the above-mentioned reason.
8) Since it must be formed to be long by λ width,
Since the magnet yoke 8-2, which is heavier by the length and width, must be used, there is a drawback that the moving magnet type linear DC brushless motor 1-2 has a larger load.

Further, since the movable magnet type linear DC brushless motor 1-2 has a large load burden, it has a drawback that heat generation of the armature coil group 5 occurs, and a countermeasure for this has been required.

[0043]

SUMMARY OF THE INVENTION An object of the present invention is to reduce the load on the moving element 3-2 of the linear DC brushless motor 1-2 without sacrificing the characteristics of the movable magnet type linear DC brushless motor 1-2 described above. And facilitate cooling of the armature coil 5 (coreless stator armature 2),
Another object of the present invention is to obtain a movable magnet type linear DC brushless motor that prevents heat generation and has improved performance and reliability with improved thrust and thrust characteristics.

[0044]

The object of the present invention is as follows.
The coreless stator armatures are approximately λ (where λ = T
+ T / 8: T is formed by an armature coil group formed at equal intervals of the width of one magnetic pole of the field magnet, and the magnet yoke of the mover is divided and formed so as to be adjacent to each of the divided magnet yokes. T so that the magnetic poles are different
P magnetic poles of N pole and S pole magnetized with the same width (P
Is an integer of 2 or more) to form a split mover, and the split mover has field magnets each having a width of approximately (1 + 1/8) λ from that of another split mover. Is formed such that the phase is shifted in the moving direction of the moving element by the distance of, and the air is blown to the coreless stator armature side from the portion where the split magnet yoke and the field magnet do not exist between the split moving elements. This can be achieved by providing a cooling fan at the position between the movers.

[0045]

Operation of the invention Two sets of five-pole field magnets 6A and 6B
Since the field magnet 6 is arranged and formed by shifting the phase in the moving direction of the moving element 3 by a distance of approximately (1 + 1/8) λ width (where λ = T + T / 8), the moving element 3 is Fig. 1 shows the thrust (torque) ripple obtained when moving.
5 field magnets 6A, 6 obtained as shown in FIG.
When each of B moves relative to the coreless stator armature 2, the five-pole field magnet 6 in the range of λ is
Thrust ripple curve 1 obtained by A and 6B respectively
7A and 17B, the (1 + 1/8) λ phase shifts from each other, and not only a very smooth thrust ripple characteristic is obtained, but also the combined thrust curve 18 obtained by combining the two thrust ripple curves 17A and 17B has a high thrust level. Therefore, the movable magnet type linear DC brushless motor 1 can obtain a larger thrust. In addition, the mover 3 is 2
The two split movers 3A and 3B are arranged apart from each other in the longitudinal direction, and since the magnet yoke and the field magnet are not present in the separated portions, the weight of the mover 3 can be reduced and the load burden can be reduced. The movable magnet type linear DC brushless motor 1 has a small size.

Furthermore, the moving element 3 is arranged by separating the two dividing moving elements 3A and 3B from each other, and since the magnet yoke and the field magnet are not present in the separated portions, the dividing element is divided. A DC axial fan motor 13 for blowing air to the coreless stator armature 2 side is attached from a portion where the magnet yokes 8A, 8B and the field magnets 6A, 6B do not exist, and the DC axial fan motor 13 is installed.
By rotating, the air can be blown to the armature coil group 5 (coreless stator armature 2) through the portions where the split magnet yokes 8A and 8B and the field magnets 6A and 6B do not exist, and cooling of the armature coils can be achieved to prevent heat generation. Measures can be taken.

[0047]

1 is a perspective view showing a main part of a movable magnet type linear DC brushless motor 1 according to an embodiment of the present invention, and FIG. 2 is a side view of a moving element 3 of the movable magnet type linear DC brushless motor 1. FIG. 3 is a vertical cross-sectional view showing a main part viewed from one side, FIG. 3 is a vertical cross-sectional view of the movable magnet type linear motor 1 seen from the traveling direction of the moving element 3, and FIG. 4 is a movable magnet type linear DC brushless motor 1 It is a top perspective view of the moving element 3 of FIG. The movable magnet type linear DC brushless motor 1 of the present invention is different from the above-mentioned conventional movable magnet type linear DC brushless motors 1-1 and 1-2 mainly in the moving element 3.

In the movable magnet type linear DC brushless motor 1 of the present invention, the entire length of the moving element 3 in the moving direction is the same as the entire length of the moving element 3-2 of the conventional moving magnet type linear DC brushless motor 1-2. It becomes a thing.

However, the movable yoke 3 of the movable magnet type linear DC brushless motor 1 has a magnet yoke 8 (composed of divided magnet yokes 8A and 8B).
Is a moving element 3 of the movable magnet type linear DC brushless motor 1-1 as a whole as shown in FIGS.
-1 can be configured to have the same length as the length of the magnet yoke 8-1. That is, compared with the magnet yoke 8-2 used for the mover 3-2 of the movable magnet type linear DC brushless motor 1-2, it can be shortened by the length of (1 + 1/8) λ. Since the magnet yoke 8 is lighter in weight, the weight of the mover 3 can be reduced,
The movable magnet type linear DC brushless motor 1 with reduced load can be configured.

This is because the movable magnet type linear DC brushless motor 1 of the present invention uses two sets of field magnets 6A and 6B as in the conventional movable magnet type linear DC brushless motor 1-2. Despite the above, the magnet yoke 8-1 of the conventional movable magnet type linear DC brushless motor 1-1 is divided into two at the center position in the longitudinal direction to form two divided magnet yokes 8A. , 8B,
The two split magnet yokes 8A and 8B have the above conditions;
The magnet yoke 8 of the movable magnet type linear DC brushless motor 1-2 is displaced by the length of (1 + 1/8) λ in the longitudinal direction of the mover 3 and is thus arranged.
This is because the length in the longitudinal direction can be made shorter than 2.

That is, the two split magnet yokes 8
The length when A and 8B are connected in the longitudinal direction of the moving element 3 can be formed to have the same length as the magnet yoke 8-1 of the movable magnet type linear DC brushless motor 1-1.

Each of the two divided magnet yokes 8A and 8B formed as described above has an end portion of the divided magnet yokes 8A and 8B located adjacent to each other.
The field magnets 6A, 6B are bonded to the surfaces of the split magnet yokes 8A, 8B facing the coreless stator armature 2 with the ends of the field magnets 6A, 6B aligned, and the split magnets 3A, 3B. To form.

In order to improve the thrust force and the thrust ripple characteristic, it is necessary to form the two split movers 3A and 3B into the mover 3 that moves integrally and integrally. The magnets 6A and 6B are positioned in the longitudinal direction of the moving element 3 by the above-mentioned condition: (1 + 1/8) λ width by means not shown to be connected and integrated.

The connecting portions between the split movers 3A and 3B are the above-mentioned field magnets 6A and 6B and the split magnet yoke 8.
Since the space where A and 8B do not exist is formed, the weight is lighter than that of the conventional moving element 3-2, and the movable magnet type linear DC brushless motor 1 with a small load can be formed.

The connecting portion between the split moving elements 3A and 3B is
Since the field magnets 6A and 6B and the split magnet yokes 8A and 8B do not exist, a space is formed between the split magnet yokes 8A and 8B so that air can be blown to the coreless stator armature 2 side at the connecting portion. To DC
Attach the axial fan motor 13.

On the upper surface of the coreless stator armature 2, there is adhered and fixed a long plate-shaped printed wiring board 4 having a through hole 7 formed at a position facing the in-frame hollow portion of the armature coil 5.

Therefore, even when the printed wiring board 4 is provided on the upper surface of the coreless stator armature 2, the DC
Since the air flow from the axial fan motor 13 also cools the inside of the hollow portion in the frame of the armature coil 5 through the through hole 7, the heat generation of the armature coil 5 can be prevented.

When the printed wiring board 4 is not provided on the upper surface of the coreless stator armature 2, the armature coil 5 is used.
Since the whole is cooled, its heat generation prevention effect is further enhanced.

[0059]

[Other Embodiments] In the above embodiments, the movable magnet type linear DC brushless motor has been described. Naturally, the invention applies.

[0060]

According to the movable magnet type linear DC motor of the present invention, the following effects can be achieved. Since the cooling fan is provided between the two split moving elements, it is possible to more effectively cool the armature coil which is apt to generate heat and whose energization is frequently switched. Because the number of cooling fans used is small,
It can be formed at low cost. Since the number of cooling fans used is small, the current loss due to the use of cooling fans can be reduced.
Since the cooling fan does not vibrate, noise can be prevented. Since more armature coils can be arranged per unit area, it is possible to reduce the weight of the moving element and improve the thrust force and the thrust ripple characteristic.
In order to improve the thrust and thrust ripple characteristics of the mover,
A cooling fan is attached to a useless portion of the mover that is inevitably formed by arranging the mover at intervals in the moving direction, and moreover, the above-mentioned useless space is allowed to pass the cool air of the cooling fan. Therefore, it is possible to prevent heat generation of the armature coil and form a highly reliable movable magnet type linear DC motor at low cost and easily.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of a movable magnet type linear DC brushless motor as an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a main part of the movable magnet type linear DC brushless motor seen from a side.

FIG. 3 is a vertical cross-sectional view of the movable magnet type linear DC brushless motor seen from the traveling direction of a moving element.

FIG. 4 is a top perspective view of a moving element.

FIG. 5 is a schematic exploded perspective view of a first conventional example of a multi-pole / multi-phase movable magnet type linear DC brushless motor.

FIG. 6 is a vertical cross-sectional view of a moving element of a first conventional example of a linear DC brushless motor as seen from the traveling direction.

FIG. 7 is a side vertical cross-sectional view of a moving element of a first conventional example of a linear DC brushless motor as seen from a side surface direction.

FIG. 8 is an explanatory diagram of a thrust ripple curve obtained by a first conventional example of a movable magnet type linear DC brushless motor.

FIG. 9 is a perspective view showing a main part of a second conventional example of a movable magnet type linear DC brushless motor.

FIG. 10 is an explanatory diagram of a field magnet used in a first conventional example of a movable magnet type linear DC brushless motor.

FIG. 11 is an explanatory diagram of a field magnet used in a second conventional example of a movable magnet type linear DC brushless motor.

FIG. 12 is a development view of two sets of field magnets and a coreless stator armature including an armature coil group of a second conventional example of a movable magnet type linear DC brushless motor.

FIG. 13 is an explanatory diagram of a thrust ripple curve and a combined thrust curve obtained by a second conventional example of a movable magnet type linear DC brushless motor.

[Explanation of reference numerals] 1, 1-1, 1-2 movable magnet type linear DC brushless motor 2, 2-1 coreless stator armature 3, 3-1, 3-2 mover 3A, 3B split mover 4 printed wiring Substrate 5 Armature coil 5a Conductor portion 5b that contributes to thrust generation Conductor portion that does not contribute much to thrust generation 6,6A, 6B, 6-1 Field magnet 7,7-1 Through hole 8,8-1,8 -2 magnet yoke 8A, 8B split magnet yoke 9 linear motion guide rail 10 roller 11, 11-1 stator yoke 12 DC axial fan motor mounting portion 13 DC axial fan motor 14 screw 15 through hole 16 field magnet positioning member 17A , 17B, 17-1 Thrust ripple curve 18 Combined thrust curve 19 Magnetic pole discrimination element

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Kamio 4-1-1 Taihei, Sumida-ku, Tokyo Inside the Seikosha Co., Ltd.

Claims (1)

[Claims] 1. A stator provided with a stator armature along the traveling direction of a mover, and an N pole arranged adjacent to a magnet yoke surface facing the stator armature have different polarities.
A movable magnet type linear DC motor having a field magnet formed by providing P magnetic poles of S and S poles (P is an integer of 2 or more), and a mover moving relative to the stator armature, Each of the stator armatures is composed of an armature coil group arranged at substantially equal intervals with a pitch of approximately λ (where λ = T + T / 8: T is the width of one magnetic pole of the field magnet). The magnet yoke is divided and formed, and there are P magnetic poles of N and S poles (P is 2 or more) magnetized so that the magnetic poles adjacent to each of the divided magnet yokes have different widths. A split mover is formed by a field magnet which has a field magnet, and the split mover is a mover having a distance of approximately (1 + 1/8) λ from the field magnets of the other split movers. of A cooling fan, which is arranged and formed with a phase shift in the moving direction, is provided at the position between the split movers to blow air to the coreless stator armature side through the gap between the split magnet yoke and the field magnet. A moving magnet type linear DC motor characterized by.