JPH0121694B2 - - Google Patents

Description

Detailed Description of the Invention The present invention provides a stator with a coreless structure in which a group of armature coils wound in an air-core frame shape on a stationary side are arranged along the moving direction of a moving element so as not to overlap with each other. An armature is provided, and in order to enable the armature coil to be energized in an appropriate direction, a group of magnetic pole detection elements are provided on the stator armature side to detect the N and S poles of the magnet. N
An open-loop flexible belt having magnets having magnetic poles of poles and south poles in its entirety or in appropriate parts is disposed as a mover, facing the stator armature with an axial gap therebetween, to achieve relative linear movement. The present invention relates to a linear DC motor with a coreless structure, which is movable as shown in FIG.

The purpose of the present invention is to provide a linear DC motor with a coreless structure, which enables high-speed running without causing step-out phenomenon, unlike a linear pulse motor, and which uses a coreless structure and an iron core that serves as a winding frame. By eliminating the need for cogging, we can reduce the weight, make it possible to form smaller products, and furthermore, by creating a coreless structure, we can ignore the vertical force and improve the machine configuration. By making it extremely simple and inexpensive to form, expanding the range of applicability to various devices, and preventing armature coil groups formed by winding into an air-core frame shape from overlapping each other, By creating a structure for the stator armature that is easy to mass produce and by preventing the armature coils from overlapping, it is possible to eliminate an increase in the magnetic air gap length and obtain a large thrust. Easy installation and excellent mass production; Brushless structure for long life; Flexible mover structure for equipment with many curved parts. In addition, when the mover is made into a flexible structure, it is possible to use a member to protect the magnet (also called a field magnet) on the outside of the magnet. and furthermore,
By making the mover extremely easy to process, and by preventing the armature coil groups from overlapping as described above even if a member to protect the magnet is provided outside the magnet, the magnetic air gap can be reduced. By eliminating the increase in length and obtaining a large thrust, the mover has an open-loop (not configured like a closed-loop endless belt) flexible structure, so that the mover faces the stator armature. To provide a linear direct current motor with a coreless structure that can fully satisfy the need for winding up and storing unused and unnecessary parts at appropriate locations.

An embodiment of the present invention will be described below with reference to the drawings.

In the case of the coreless structure linear DC motor of the present invention, the stator 1 and the mover 2 naturally move relative to each other.
However, in the case of the linear DC motor of the present invention, as will be described later, the mover 2 is not configured in the form of an annular closed-loop flexible belt, but is instead an open-loop flexible belt. Therefore, in this embodiment, one end is open, and an appropriate portion of the other end is a guide roller 1 constituting a winding device for winding up the moving element 2.
It is engaged on the 0 side.

The stator 1 is an air-core type in which the conductive wire arranged on the lower surface of the stator plate 5 is wound in a frame shape, for example, in a rectangular frame shape, with many turns (about 200 turns, for example), and then solidified by plastic molding. A stator armature with a coreless structure (the winding frame of the coil 3 is not provided with a magnetic material) consisting of three groups of armature coils formed in the shape of a rectangular frame, and a stator armature that is fixedly attached to the armature coil 3 of the stator armature. It consists of a magnetic pole detecting element, for example, four groups of Hall elements, arranged at an appropriate position on the stator armature side that can detect the magnetic pole of a magnet 6, which will be described later, at or near the stator armature.
In addition, in the case where the linear DC motor with a coreless structure of the present invention is formed at low cost and does not have to be a long-life linear DC motor with a coreless structure, the armature coil 3 can be wound into a rectangular frame shape (using a winding machine). The purpose can be achieved by using self-bonding wire as the conductor for If a self-fusing conductive wire is used, for example, the surface of the conductive wire is heated by the heat generated when the self-fusing wire formed after being wound comes into contact with the surface of the previously wound conductive wire. The heat-sealing resin applied to the wires melts appropriately, cools naturally, and solidifies, thereby fixing the conductor wires to each other.
The armature coil 3, which is finally wound into a rectangular frame shape, maintains its shape to some extent even without the need for subsequent plastic molding. It goes without saying that depending on the purpose and use, it may be necessary to further mold the material with plastic in order to make it sufficiently strong. In addition, the 3 groups of armature coils are designed to configure the stator armature of a linear DC motor with an appropriate number of phases, to have a structure that facilitates mass production of the stator armature, and to prevent the armature coils 3 from overlapping each other. By doing so, it is possible to eliminate an increase in the magnetic gap length and obtain a large thrust, and further, to facilitate the arrangement of the Hall element 4 and to improve mass productivity. In making the mover 2 have a flexible structure, the magnetic In order to eliminate the increase in air gap length and obtain a large thrust, the three groups of armature coils are arranged and formed adjacent to each other along the moving direction of the mover 2 so as not to overlap each other. desirable. For this reason, this linear DC motor has a coreless structure by arranging three groups of three armature coils adjacent to each other so as not to overlap each other to form a three-phase linear DC motor arrangement, as shown in Figure 1. It forms the stator armature of. If it is desired to make the stator 1 longer depending on the purpose or application, for example, if a three-phase stator armature is used as shown in this embodiment, these three-phase stator armatures can be made longer. Multiple sets may be used. Next, the magnetic pole detection element described above, for example, the Hall element 4, detects the magnetic poles of the N and S poles of the magnet 6, which will be described later.By detecting the N and S poles of the magnet 6, A current in an appropriate direction to move the magnet 6 in a predetermined direction is passed through the rectangular frame coil 3, and the mover 2 is caused to perform linear reciprocating motion according to Fleming's left hand rule. . In FIG. 1, the Hall element 4 is housed within a frame cavity 3a of the armature coil 3, and is configured to reduce the size of the device. Also, when making the plastic mold of armature coil 3,
By molding the Hall element 4 at the same time,
It is convenient to simplify the process. It should be noted that the Hall element 4 is not required to be housed in the frame cavity 3a, and may be fixedly installed on the frame surface facing the magnet 6 of the armature coil 3. It may be fixedly installed between 3 and 3. A stator plate 5 provided on the inner surface of the stator 1 is formed of an iron plate in order to close the magnetic path of the magnet 6 together with a stator iron plate 7. In this case, a flexible sheet is used as the stator plate 5, formed to be easily bent to suit the running curve of the mover 2, and pasted with adhesive to a magnetic path closing iron member of an appropriate shape. It is also possible to fix it by attaching it or the like. Stator iron plate 7 is stator plate 5 (stator 1)
As shown in FIG. 2, they are arranged facing each other with an appropriate gap (space) between them by a connecting shaft 8. That is,
The stator of a linear DC motor with a coreless structure (consisting of a stator plate 5 and a stator iron plate 7) has a stator having a rectangular frame shape in a cross section in the right angle direction, for example, as shown in FIG. , the inner cavity 9
is formed, and the mover 2 passes through this inner cavity 9. That is, the mover 2 is slidably disposed in the gap between the stator plate 5 and the stator iron plate 7. The connecting shaft 8 is made of synthetic resin, for example, in order to form the linear DC motor of the present invention with a coreless structure at low cost, and furthermore, when the slider 2 has a width such that both sides thereof touch the connecting shaft 8, In order to make the linear movement of the mover 2 smooth, its outer peripheral surface is treated with polytetrafluoroethylene (trade name: Teflon). Alternatively, the connecting shaft 8 itself is made of polytetrafluoroethylene. Mover 2
It consists of a flexible belt that allows it to travel around curves and store it in an appropriate space. Therefore, considering durability and appearance, it is made of, for example, synthetic resin. An appropriate part of the mover 2 made of a flexible belt, for example, as shown in FIG. A magnetized flexible magnet 6 for driving the mover is built-in. The flexible magnet 6 is made of, for example, a rubber magnet or a plastic (synthetic resin) magnet. The thickness of the movable element 2 made of a flexible belt is increased only in the portion containing the flexible magnet 6, but the thickness of the remaining portion can be reduced. Now, if the linear DC motor is moved in a straight line, for example, in the right direction in FIG. The part 2 is guided to a predetermined location via a guide roller 10, etc. that constitutes a winding device (which also serves as a feeding guide mechanism) for winding up the mover 2, and is placed in a storage section or rolled up. When a current is applied to the armature coil 3 in a direction that moves the mover 2 to the left, the mover 2 moves linearly to the left according to the magnitude of the applied current. This makes it easy to pull out from the storage section or roll-up (frame). Therefore, its applications are wide-ranging. In Fig. 1, only the right side of the slider 2 has a long part without the magnet 6, but it can be similarly formed on the left side of the slider 2 and can be wound up in the same way as above. Needless to say, you can leave it as is. In order to prevent the mover 2 from vibrating vertically or horizontally and causing large noise, it is necessary to provide guide rollers for the mover 2 on the connecting shaft 8, stator plate 5, or stator iron plate 7. be. In this respect, in the present invention, the connecting shaft 8 itself or its surroundings are made of polytetrafluoroethylene, as described above, in order to be as inexpensive and compact as possible and to allow the moving element 2 to run extremely smoothly in a straight line. And, moreover,
The connecting shaft 8 is placed at a position where both sides of the movable element 2 are approximately in contact with each other, thereby eliminating horizontal vibration of the movable element 2 and the noise generated thereby, and smoothing the linear movement of the movable element 2. . The back side of the stator plate 5 and the surface of the stator iron plate 7 facing the mover 2 (magnet 6) are formed of synthetic resins 11 and 12,
V-shaped protrusions 11a and 12a for preventing vertical vibration of the movable element (flexible belt) 2 are integrally formed on the surfaces of the synthetic resins 11 and 12 facing the movable element 2. Since both sides of the movable element (flexible belt) 2 are in contact with the protrusions 11a and 12a, vibration in the vertical direction is controlled.
In this case as well, in order to make the linear movement of the mover 2 extremely smooth and to eliminate the noise caused by this, the synthetic resins 11 and 12 (including the protrusions 11a and 12a) themselves are made of polytetrafluoroethylene. The effects of the present invention will be even more excellent if the surfaces of the resins 11 and 12 facing the mover (flexible belt) 2 are treated with polytetrafluoroethylene. The trademark (product) name of this polytetrafluoroethylene is Teflon, and it is well known that it is a plastic developed by DuPont. This polytetrafluoroethylene is made from Freon (a compound of fluorine, chlorine, and carbon), which is used as a refrigerant in household electric refrigerators, and is polymerized using a catalyst and peroxide. It is. The coefficient of friction of polytetrafluoroethylene is said to be the lowest among all substances, 0.03.
That's about it. Therefore, by using polytetrafluoroethylene for the above-mentioned or below-mentioned constituent elements or their surfaces, the smooth linear running performance of the mover 2 is made extremely good. Furthermore, since polytetrafluoroethylene has outstanding properties in terms of heat resistance, cold resistance, chemical resistance, electrical insulation, etc., the properties of the coreless structure linear DC motor of the present invention are further improved. . Although it is very preferable to form the above-mentioned or below-mentioned constituent elements themselves from polytetrafluoroethylene, it is currently quite expensive compared to the case where other inexpensive plastics are used. In order to obtain an inexpensive linear DC motor with a coreless structure according to the present invention, it is desirable to treat only appropriate portions of the surfaces of the above-mentioned components with polytetrafluoroethylene.

In the case of the mover 2 made of the flexible belt described above, the flexible belt is made of synthetic resin, but the synthetic resin in this case may be made of polytetrafluoroethylene, or an inexpensive synthetic resin may be used. A belt body may be formed, and the surface thereof may be treated with polytetrafluoroethylene.

Further, in the above embodiment, the flexible magnet 6 is built into the movable member 2 made of a flexible belt, but it is not necessary to do so. A flexible belt (mover) 2 is formed from rubber or synthetic resin, and the flexible belt is magnetized with N and S poles alternately at appropriate intervals along its longitudinal direction, thereby creating a flexible magnet for driving the mover. It may also be used as a flexible belt (mover) 2 that also serves as a net. In this case, it is not necessary to magnetize the entire structure, and it is sufficient to magnetize only the necessary and appropriate portions. Even in this case, especially when the flexible belt has a rubber magnet part, it is desirable to treat the surface with polytetrafluoroethylene.

The linear DC motor of the present invention has a coreless structure,
Because of the above configuration, unlike a linear pulse motor, the mover can run smoothly at high speed without causing step-out phenomenon.The coreless structure eliminates the need for an iron core as a winding frame.
The number of parts is small, and since there is no winding iron core, there is no cogging, and the slider can move smoothly.It is also light in weight, and can be easily formed into small pieces.Since it has a coreless structure, vertical force can be ignored. Therefore, the mechanical structure such as a bearing can be extremely simplified and formed at low cost, and the range of applicability to various devices can be expanded by arranging a group of armature coils wound in the shape of an air-core frame so that they do not overlap with each other. Since the stator armature is composed of two coils, it is easy to mass-produce the stator armature, and since the armature coils are arranged without overlapping, the magnetic gap length does not need to be increased, so a large thrust can be achieved. is obtained,
The magnetic pole detection element can be easily arranged and mass-produced.The brushless structure provides a long service life.The mover has an open-loop flexible belt structure. The mover can be modified in various ways even in devices with many curved parts.Since the mover has a flexible structure, it can be processed and formed into an appropriate shape.A member to protect the magnet can be provided outside the magnet. As mentioned above, since the armature coil groups do not overlap, there is no increase in the magnetic gap length.
It has many effects, such as the ability to obtain a large thrust force, and by making the mover an open-loop flexible structure, it can be wound up and stored at an appropriate location in an unnecessary part of the mover that does not face the stator armature.

[Brief explanation of drawings]

1 and 2 are basic explanatory diagrams of the structure of a linear DC motor having a coreless structure according to the present invention. (Explanation of symbols), 1... Stator, 2... Mover,
3... Armature coil, 4... Magnetic pole detection element (Hall element), 5... Stator plate, 6... Flexible magnet for movable element drive, 7... Stator iron plate, 8
... Connection shaft, 9 ... Inner cavity, 10 ... Guide roller, 11, 12 ... Synthetic resin, 11a, 1
2a...V-shaped protrusion.

Claims (1)

[Claims] 1. A stator armature with a coreless structure is provided on the stationary side, in which a group of armature coils wound in an air-core frame shape are arranged along the moving direction of the mover so as not to overlap each other, and the armature coils are In order to conduct current in an appropriate direction, a group of magnetic pole detection elements for detecting the magnetic north and south poles of the magnet is provided on the stator armature side, and the magnets having the magnetic poles of the north and south poles are arranged alternately. An open-loop flexible belt provided on the whole or in an appropriate part is provided as a mover and is movably disposed facing the stator armature with an axial gap therebetween so as to perform relative linear movement. A device is provided for winding a mover having a belt at a predetermined location,
Linear DC motor with coreless structure.