JPS611256A - Core type dc linear motor - Google Patents

Abstract

PURPOSE:To readily mount an armature coil on a salient pole by providing salient poles at a suitable interval at the prescribed angle on a yoke, and mounting armature coils of air core type on the outer periphery of the poles. CONSTITUTION:A plurality of, such as, 4 salient poles 4 of the angle width of 2/3 of the pole width T of field magnets 6 are integrally formed at a suitable interval on the inner surface of a movable magnetic yoke 7. Pole coils 3 are formed in a rectangular shape of air core type of 2/3.T of angle of the poles 4. When the coils 3 are mounted on the outer periphery, the poles 4 are decided so that the gap between the poles 4 and 4 is suitably designed so as not to superpose each other. Thus, in case of energizing at 120 deg., the interval between the poles 4 and 4 is sufficient. Accordingly, mounting of the coils 3 on the poles 4 is facilitated as compared with the case of energizing at 180 deg..

Description

[Detailed description of the invention] (Technical field of invention) The present invention relates to a ferrous core DC linear motor.

(Technical Background) Conventionally, most of the linear motors found in many products are linear pulse motors. However, such linear pulse motors require remarkable mechanical IJD machining precision, are expensive and heavy, and cannot move the running element at high speed, and when attempting to lower the running element at high speed, tax problems occur and malfunctions occur. Accompany.

However, as the linear motor, a DC linear motor is more desirable.

Furthermore, voice coil type DC linear motors are known, but conventional DC linear motors of this type have a complicated magnetic circuit structure, so generally only those with short strokes can be formed.

In order to eliminate such drawbacks, the present applicant.

A field magnet tray with N and S magnetic poles alternately having p (p is a positive integer greater than or equal to 2) poles along the longitudinal direction (movement of the slider) has an opening angle of the conductor that contributes to the thrust. The above-mentioned coreless armature is composed of one or more air-core armature coil groups formed to have a width approximately 2n-1 (n is a positive integer of 1 or more) times the driving magnetic pole width of the field magnet. A number of direct current linear motors have been developed which are provided opposite to each other so as to move relative to the field magnet, and in which either the field magnet or the armature is used as a stator, and the other is used as a mover.

Such a DC linear motor is useful because it can eliminate the drawbacks of conventionally known voice coil type linear motors and linear pulse motors.

Since it is a coreless DC linear motor, it is responsive, has a simple structure, is inexpensive, and is extremely easy to unitize, which is a disadvantage of DC linear motors.

It has the feature that it can be mass-produced extremely easily in various lengths.

In addition, since it is a coreless (iron core type) DC linear motor,
Since the iron core and the field magnet do not attract each other, a load is placed on the bearing and the guide support part of the slider.As a result, it is possible to use a cheaper bearing and guide support part. It has the advantage of being mass-produced at low cost.

In addition, the armature coil is extremely easy to form and can be easily placed in any position. The yoke is extremely simple. As a result, overall, it is very useful in terms of performance, manufacturing, unitization, design changes, and mass production costs compared to iron core DC linear motors.

However, in the case of a coreless DC linear motor,
Since it does not have a core (iron core), it has the disadvantage of not being able to obtain large thrust compared to iron core DC linear motors. In the case of a coreless DC linear motor, since there is no core (iron core), there is an advantage that coking does not occur, but on the other hand, there is no coking torque, so the core (iron core) and field magnet Since there is no suction force between the two, the disadvantage is that compared to iron core type DC linear motors, large thrust cannot be obtained.

This naturally arises from the respective properties of coreless and cored types, and it goes without saying that which one is better is selected as appropriate depending on the device to which it is applied.

This is because the characteristics of a coreless motor and those of a cored DC linear motor are different.

However, most of the conventional iron core type DC motors have a complicated structure of the iron core for winding the armature coil, and a winding machine is required to wind the armature coil. However, it was complicated and expensive, and it was difficult to wind the armature coil around the iron core, making it unsuitable for mass production and expensive.

In addition, most of the conventional iron-core type DC linear motors have the disadvantage that high efficiency cannot be obtained when counter thrust is applied. In addition, conventional iron-core DC linear motors have the drawback that it is difficult to wind armature coils around the salient poles, and moreover, it is not possible to wind a large number of armature coils, making it impossible to obtain a large thrust.

Yet again. According to the conventional iron core type DC linear motor,
Since there is a large thrust (torque) ripple when the field magnet switches between the N pole and the S pole, there is a drawback that the running element (mover) cannot be moved smoothly.

(Objective of the present invention) The present invention provides a standing iron core type DC linear motor made based on the circumstances in item 1. is simple, and (2) the salient pole (
The shape of the armature coil for winding around the iron core is simple and can be formed at a very low cost using a simple winding machine.
) The armature coil can be easily wound around the salient pole (iron core), (4) it can be mass-produced at low cost, and (5) the salient pole can be wound with a large number of turns, making it possible to thrust is obtained, (6) there is no reaction thrust, and the armature coil is energized at the most efficient position at 120 degrees, making it highly efficient; (7) the unit (8) The armature can be easily changed to a longer or shorter stroke as needed, and (9) Large thrust can be created. (
This was done with the purpose of making it possible to mass-produce products that meet 101 performance and cost at low cost and easily.

(Means for achieving the object of the present invention) The iron core type DC linear motor of the present invention is as follows.

p having magnetic poles of N pole and S pole along the running direction of the mover
(p is a positive integer of 2 or more) pole field magnet is provided, and a yoke that moves relative to the field magnet has an opening of two-thirds or almost two-thirds of the magnetic pole width of the field magnet. One or more salient poles with an angular width are formed at appropriate intervals, and an air-core armature coil having an inner diameter that approximately matches the opening width of the salient poles is attached to the outer periphery of the salient poles. This is achieved by using either a magnetic magnet or a yoke with an armature coil attached to a salient pole, one of which serves as a mover and the other a stator.

(Embodiment of the present invention) Hereinafter, with reference to FIGS. 1 to 7, a movable magnet type iron core DC linear motor LM according to a first embodiment of the present invention will be described.
A moving coil type iron core DC linear motor LM' according to a second embodiment of the present invention will be described with reference to FIGS. 8 to 11.

(Second embodiment) Figure 1 shows a moving coil type iron core DC linear motor LM.
Figure 2 is a side view of Figure 1, and Figure 3 is a longitudinal sectional view of Figures 1 and 2 as seen from the running direction. The configuration of a moving coil type iron core DC linear motor LM will be described with reference to the drawings.

In the moving coil type iron-core DC linear motor LM of the first embodiment of the present invention, a long plate-shaped stator yoke 1 is integrated with a long plate-shaped guide protrusion 2 narrower than the width of the stator yoke 1. As shown in FIGS. 1 and 4, a long plate-like plate having a large number of N-pole and S-pole magnetic poles magnetized in the thickness direction alternately at intervals of a magnetization width T in the longitudinal direction is formed. A field magnet 6 is used as shown in FIG. It goes without saying that the field magnet 6 may be formed of field magnet segments forming each magnetic pole, and the field magnet 6 may be formed on the guide protrusion 2 as shown in FIG. 4. A U-shaped running magnetic yoke 7 is provided facing the L field magnet 6, and a running roller 8 rotatably supported on the side surface of the running magnetic yoke 7 is attached to the guide protrusion. It is guided by the side parts of 2 and moves smoothly in the running direction. Traveling magnetic yoke 7
As shown in FIG.
An appropriate number of salient poles 4 with an opening angle width of T) are installed in the longitudinal direction, for example, 4.
The pieces are integrally (or indirectly) formed at appropriate intervals. The armature coil 6 is.

It has become. A plurality of armature coils 3 are each mounted on the outer periphery of each salient pole 4, and the running magnet is fixed to the inner surface of the body yoke 7 by adhesion or the like, thereby forming a movable armature.

In addition, when the armature coil 3 is attached to the outer periphery of the salient pole 4, the salient pole 4 is arranged so that the armature coils 6 do not overlap with each other.
and the spacing between the salient poles 4 are appropriately designed and determined. Furthermore, salient pole 4
The reason why the opening angle width is set to 1/2 is to enable 120 degree energization. When struck and energized 180 degrees, one armature coil B can energize over the range of one magnetic milk J of the field magnet 6.

That is, there is a Tosada that can conduct electricity over a long range of 180 degrees in electrical angle. However, on the other hand, switching of energization at the boundary between the north and south poles of the field magnet 6 generates a large thrust ripple, making it impossible for the mover to run smoothly. Therefore.

In the present invention, the armature coil B can be passed through 120 degrees in a position that is most efficient and does not cause large thrust ripples. In addition, in the case of 180 degrees passing, since the opening angle of the salient pole 4 must be T, the stroke length is limited (in this case, it is not possible to arrange a large number of armature coils 6,
Since it is not possible to obtain a large thrust force and a smooth thrust ripple, it is possible to arrange a large number of armature coils 5 within a limited stroke length, so a large thrust force can be obtained, and a smooth thrust ripple can be obtained. You can get one with thrust ripple. Also, in the case of a 180 degree pass,
If the opening angle of the salient pole 4 is T and the opening angle force of the salient pole 4 is 120 degrees, the opening angle force of the salient pole 4 is only IT, so the same number of salient poles 4 are formed in a limited stroke length, and the same number When armature coils 6 are arranged, in the case of 120-degree passing, the distance between the salient poles 4 is wide, so the armature coil 6 formed by winding a number of turns of conductive wire is attached to the salient poles 4. Because it can be equipped on the outer periphery of
Larger thrust can be obtained compared to 180 degree passage. Also,
In the case of 120 degree rotation, the spacing between the salient poles 4 is 1 minute, so it is much easier to attach the armature coil 6 to the salient pole 4 compared to the case of 180 degree rotation. It is.

For the above reasons, it is advantageous that the opening angle of the salient poles 4 of the present invention is -T. As shown in FIG. 6, a 1-position detection element 5 (for example, a Hall element) is placed at a position where the conductor part 6a and the conductor part 3b cross.

A magneto-electric conversion element such as a Hall IC) is disposed by soldering. The position detection element 5 is used to determine which direction of current should be applied to the armature coil B by detecting the N pole or S pole of the field magnet 6.

Furthermore, if the 1st position detection element 5 is placed at the above position, a DC linear morph LM with smooth thrust J (1-lux) ripple can be obtained.
This is desirable, and the position sensing element 5 can be easily disposed at a suitable position, which is advantageous in mass production. Further, the position detection element 5 faces the side surface of the field magnet 6, and detects the leakage magnetic flux of the N or S pole.

An appropriate signal is output to the semiconductor rectifier (drive circuit) 16. The position sensing element 5 can be disposed at such a position only by the width of the conductor section 61 of the armature coil B.

This is because the width of the field magnet B can be narrowed.

Therefore, a space is created in which the position detection element 5 can be disposed on the armature side facing the side surface of the field magnet B.

FIG. 7 is a developed view of the field magnet 6 and a movable armature consisting of three groups of armature coils. As is clear from FIG. 7, the reason why the opening angle between the conductor portions a and 6a of the armature coil is T is that the opening angle force of the salient pole 4 is formed to be 3-.]. still.

Although the armature coil 6 is actually formed with an opening angle wider than '3-T, the armature coil 6 is
The reason why the opening angle is the same as that of the salient pole 4 is because the field magnetic flux of the field magnet B does not pass through the armature coil 6, which has a high magnetic resistance, but only through the salient pole 4, which has a low magnetic resistance. It's for passing. Therefore.

In the coreless type DC linear morph, the opening angle between the conductor parts 3a and 6a that contributes to the thrust force of the armature coil 6 is set to 5.
-- It will be the same as when formed in T. For this reason 1
Since it is hard to generate counter thrust and is of iron core type, it is possible to obtain a DC linear motor LM with a large thrust. Therefore, the current conduction angle of one armature coil 6 is:

Since the electrical angle is 1.20 degrees, the 6 groups of armature coils are switched energized at an electrical angle of 120 degrees. An iron core type DC linear motor LM is obtained. Now, assuming that the moving coil type iron core type DC linear motor LM is powered on, current flows in the direction of the arrow in the three groups of armature coils that make up the armature, as shown in Fig. 7. t, a thrust in the direction of arrow F is obtained, and the armature, i.e., the running element, moves in the direction of arrow F.
Run and move in the direction. Both terminals of each group of armature coils 6 are connected to a semiconductor rectifier 16, and both output terminals of the 1-position detection cable 5 are connected to a semiconductor rectifier 9. 10
-1 and 10-2 are a positive power terminal and a negative power terminal of the semiconductor rectifier 9, respectively. As is clear from FIG. 7, the armature coil 6 has a width equal to the width of the magnetic pole of the field magnet B, and each group of armature coils 6 is arranged so as not to overlap with each other.

(Embodiment 1) In the above example, a moving coil type iron core DC linear motor LM is shown, but a moving field magnet in which the field magnet 6 serves as a running element and the armature serves as a stator is used. Needless to say, it is also good as a near-moke type with iron core type direct current. In this case, in the case of the above embodiment,
Since the arrangement of the field magnet 6 and the armature consisting of three groups of armature coils can be reversed, a detailed explanation will not be provided.

In the case of such a moving field magnet type iron core type DC linear motor, the armature side is formed short in the longitudinal direction,
The field magnet 6 may be formed long.

In addition, as shown in FIGS. 8 to 10, there is a moving field magnet type iron core DC linear motor LM in which the armature side is formed long in the longitudinal direction and the field magnet 6 is formed short.
' may also be used. In this case, it is preferable that the salient pole 4 and the guide protrusion 2 are integrally formed. In this case, a substrate made of another non-magnetic material may be used instead of the stator yoke 1.

In this case as well, the field magnet 6.

Needless to say, it does not have to be monolithic and may be formed using a plurality or a large number of materials.

(Other Embodiments) In the embodiment described above, the magnetic poles of the field magnet B are skewed, or the conductor portion 3 of the armature coil B is
The spirit of the present invention is still alive and can naturally be applied even when the a and the salient poles 4 are avoided to be skewed.

Further, a large number of the salient poles 4 are formed on the stator yoke 1 etc.,
Although the armature coil 6 was wound around each of the salient poles 4, the stator yoke 1 etc. was formed short, one or several salient poles 4 were formed on the short stator yoke 1 etc., and the salient poles 4 A ferrous core DC linear motor unit is formed in which an armature coil 3 is wound around the core.

By arranging and fixing an appropriate number of units at appropriate positions, it is possible to easily form a cored DC linear motor with an appropriate stroke length.

Furthermore, in the criminal example, an example was shown in which rectification was performed using a semiconductor rectifier and a position detection element.

The current may be rectified using a commutator and a brush.

(Effects of the present invention) Since the present invention has the configuration shown in "-", (1) the structure of the salient pole (iron core) for winding the armature coil is extremely simple, and (2) the salient pole The shape of the armature coil for winding can be formed at an extremely low cost using a simple winding machine.
The armature coil described in 31h can be easily wound around salient poles, (4
, +7, the machine can be mass-produced at low cost, and (5) the opening angle of the salient pole is the width of the magnetic pole of the field magnet, so 120
Large thrust can be obtained because the main energization is constant and a large number of armature coils can be arranged in a limited space, and a smooth thrust ripple can be obtained. Alternatively, a large thrust can be obtained because the salient pole can be wound with an armature coil made by winding many turns of conductive wire.(6) has almost no counter-thrust, and 1
20 degree main energization Since the armature coil can be energized at the most efficient position, high efficiency can be obtained with smooth thrust ripple. (7) It can also be made into a unit.

Long or short strokes can be easily formed based on design specifications, (8) armatures can be easily changed to longer or shorter armatures as needed, and (9) large thrust is required. By arranging a large number of salient poles and armature coils (or units) at locations where only a small thrust is required, and a small number of salient poles and armature coils (or units) as appropriate, at locations where only a small thrust is required. , 00) It is possible to mass-produce products according to performance and cost at low cost and easily. This has the advantage of being able to provide a ferrous core type DC linear motor having the following effects.

[Brief explanation of drawings]

FIG. 1 is a top view of a moving coil type iron-core DC linear motor according to the first embodiment of the present invention, and FIG. 2 is a side view of FIG. 1.
Fig. 3 is a longitudinal cross-sectional view of the one in Figs. 1 and 2 as seen from the running direction, Fig. 4 is a perspective view of the field magnet, and Fig. 5 shows the arrangement of the armature coils on the salient poles. Fig. 6 is a perspective view showing the arrangement of position detection elements and the shape of the armature coil, Fig. 7 is a developed view of the armature consisting of a field magnet and armature coil group, and Fig. 8 is a perspective view showing the arrangement of the position detection element and the shape of the armature coil. A top view of a moving field magnet type iron core DC linear motor corresponding to FIG. 1 of the second embodiment of the present invention, FIG. 9 is a side view of FIG. 8, and FIG. 10 is a side view of FIG. 8 and FIG. FIG. 9 is a longitudinal cross-sectional view of the vehicle shown in FIG. 9, viewed from the running direction. LM... Moving coil type iron core type DC linear motor, LM' - Moving field magnet type iron core type DC linear motor, 1... Nuteta Yori, 2.
... Kite protrusion, 3 ... Armature coil, 4.
... Salient pole, 5. Position detection element, 6. Field magnet, 7. Running magnetic yoke, 8. Running roller. 9... Semiconductor rectifier, 10-1... Plus power terminal, 10-2... Minus power terminal.

Claims (1)

[Claims] p having magnetic poles of N pole and S pole along the running direction of the mover
(p is a positive integer of 2 or more) A field magnet with a pole is provided,
One or more salient poles having an opening angle width of two-thirds or approximately two-thirds of the magnetic pole width of the field magnet are formed at appropriate intervals on a yoke that moves relative to the field magnet, and the salient poles are formed at appropriate intervals. An air-core armature coil having an inner diameter that approximately matches the opening angle width is attached to the outer periphery of the salient pole, and either the field magnet or the yoke with the armature coil attached to the salient pole is attached to the movable element. and a stator.