JP2008136319A - Motor and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor in which disconnection and an insulating defect are less apt to occur in a hollow core coil and which has ample assembly workability, and to provide a manufacturing method of the motor. <P>SOLUTION: The hollow core coil 20 is fixed to an inner face of a motor case 18, having an installation face 18b on which the hollow core coil 20, is installed and a case part 18a covering the outer periphery of the hollow core coil 20; then the motor case 18, which covers the stator core 16 so that a pole teeth 22 group of the stator core 16, is arranged on an inner periphery of the hollow core coil 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a motor, and more particularly to a motor including an air-core coil.

  2. Description of the Related Art Conventionally, as a PM type (Permanent Magnet Type) stepping motor using a permanent magnet as a rotor, for example, as shown in Patent Document 1, a motor having an air core (bobbinless) coil without a coil bobbin is known.

  In such a stepping motor, for example, as shown in FIG. 6, a plurality of pole teeth 104 are erected on the inner peripheral edge of the stator core 102, and an air-core coil 108 is mounted on the outer periphery of the group of pole teeth 104. A motor case 110 covering the air-core coil 108 is attached to the stator core 102 to form a stator member 112a, and the stator member 112a is overlapped to form a stator 112. At the center of the stator 112, a rotor 114, in which a magnet (permanent magnet) 114b is integrally provided around a rotating shaft 114a, is rotatably supported on mounting plates 118a and 118b via bearings 116a and 116b. Has been.

  In the stepping motor 100 configured as described above, a rotational driving force is applied to the rotor 114 due to the interaction between the magnetic field generated by the current flowing through the air-core coil 108 and the magnet 114b, and from one end side of the rotating shaft 114a. As is well known, the rotation is output.

  When assembling such a stepping motor 100, conventionally, after applying an adhesive member such as an adhesive to one end face of the air core coil 108, the air core coil 108 is arranged coaxially with the stator core 102, The air core coil 108 is attached to the stator core 110 so that the pole teeth 104 of the stator core 102 are arranged on the inner periphery of the air core coil 108. A mounting surface 120 for receiving one end face of the air-core coil 108 is provided at the base end of the group of pole teeth 104 of the stator core 102, and the air-core coil 108 is fixed to the mounting surface 120.

Further, a terminal pin 122 is supported on a terminal block 122 a integrally attached to the outer peripheral edge of the stator core 102, and a lead wire 108 a drawn from the air core coil 108 is wound around and connected to the terminal pin 122. The lead wire 108a is routed from the notch 110a provided in the motor case 110 to the outside of the motor case 110, but is arranged so as not to be disconnected by contacting the notch 110a. That is, the air-core coil 108 is mounted on the stator core 102 so that the end surface provided with the lead wire 108a is disposed on the mounting surface 120 side of the stator core 102.
JP 2004-112985 A

  However, in the structure in which the air-core coil 108 is fixed to the mounting surface 120 of the stator core 102 in this way, the lead wire 108a of the air-core coil 108 is sandwiched between the air-core coil 108 and the mounting surface 120 of the stator core 102. Will be. For this reason, when the air-core coil 108 is fixed in close contact with the stator core 102, the lead wire 108a is disconnected if it is pressed too strongly.

  Further, as described above, when the motor case 110 is attached to the stator core 102 after the air-core coil 108 is attached to the stator core 102, the outer peripheral surface of the air-core coil 108 after the air-core coil 108 is attached to the stator core 102. When the motor case 110 is mounted, the jig, the motor case 110, etc. may come into contact with the outer peripheral surface of the air core coil 108 to damage the air core coil 108. Insulation failure or disconnection may occur.

  As described above, when disconnection or insulation failure occurs in the air-core coil 108, a current is not normally supplied to the air-core coil 108, which affects the characteristics of the stepping motor 100. Further, since the coil winding is exposed on the entire surface of the air-core coil 108, the coil winding is easily damaged, so that the assembly work of the motor is poor and the product yield is reduced. There was also.

  Therefore, the problem to be solved by the present invention is to provide a motor with good assembling workability and a method of manufacturing such a motor, in which the air-core coil is less susceptible to disconnection or insulation failure in a motor using an air-core coil. There is.

  In order to solve the above problems, a motor according to the present invention includes a stator core in which a plurality of pole teeth are erected on the inner periphery, an air-core coil disposed on the outer periphery of the plurality of pole teeth of the stator core, In a motor having a motor case attached to the stator core so as to surround the air-core coil, an inner peripheral surface of a case portion covering the outer periphery of the air-core coil of the motor case and / or the empty space of the motor case. The gist is that the air-core coil is fixed to a mounting surface on which the core coil is mounted. According to such a motor, since the outer peripheral surface of the air core coil is covered and protected by the case portion of the motor case, it is possible to prevent insulation failure due to damage to the coil winding of the air core coil. In addition, since the air-core coil is fixed to the motor case, the lead-out wire of the air-core coil is not sandwiched between the air-core coil and the stator core and disconnected, and the motor assembly workability is improved. .

  In this case, a plurality of pole teeth are erected on the inner peripheral edge of the mounting surface on which the air-core coil of the motor case is mounted toward the pole tooth group on the stator core side. It is preferable that the teeth group and the pole teeth group of the motor core are arranged so as to mesh with each other.

  Furthermore, it is more preferable that an insulating member is interposed between the air-core coil and the motor case. Thereby, since insulation between an air core coil and a motor case is maintained more reliably, a short circuit by contact can be prevented.

  As this insulating member, for example, an insulating sleeve attached to the inner peripheral surface of the air core coil and / or an insulating sheet interposed between the end surface of the air core coil and the mounting surface of the motor case, etc. Applies.

  The air-core coil may be fixed to the inner side of the motor case via a heat-adhesive resin material. Thereby, since an air-core coil can be adhere | attached on a motor case in a short time, productivity improves. In addition, the heat-adhesive resin material is softer and more elastic than the motor case, so that when the air-core coil is fixed, excessive pressure is applied to the air-core coil, causing damage to the air-core coil. Can be prevented.

  Furthermore, it is more preferable that the end surface provided with the lead wire of the coil winding of the air-core coil is disposed so as to face the stator core. According to such a configuration, a gap is secured between the air core coil fixed to the motor case and the stator core, and the lead wire of the air core coil is sandwiched between the air core coil and the stator core. It can be prevented from being damaged or disconnected.

  Further, a pair of stator members each including the stator core, the air-core coil, and the motor case may be provided, and the pair of stator members may be integrally stacked with the stator cores back to back. According to such a configuration, the step angle of the motor can be further reduced by shifting the arrangement of the pole teeth between the one stator member and the other stator member. In addition, since the magnetic force generated by energizing the air-core coil is increased, the torque of the motor can be improved.

  In the motor manufacturing method according to the present invention, an air core coil is disposed on the outer periphery of a stator core in which a plurality of pole teeth are formed upright on the inner periphery, and a motor case is attached to the stator core so as to surround the air core coil. When the motor is manufactured, the air core coil is fixed inside the motor case, and the pole tooth group is disposed on the inner periphery of the stator core on the inner periphery of the stator core. The gist is that the motor case is attached.

  Further, a pair of stator members each including the stator core, the air-core coil, and the motor case may be provided, and the pair of stator members may be fixed back to back.

  According to the motor of the present invention, the air-core coil disposed on the outer periphery of the pole tooth group standingly formed on the inner peripheral edge of the stator core is fixed to the inner surface of the motor case attached to the stator core. Since the outer peripheral surface of the core coil is covered and protected by the case portion of the motor case, it is possible to prevent the coil winding of the air core coil from being damaged and causing insulation failure or disconnection. In addition, since the air core coil is fixed to the motor case, the lead wire of the air core coil can be prevented from being pinched between the air core coil and the stator core and disconnected. Sexuality is improved.

  Further, according to the motor manufacturing method of the present invention, after the air core coil is fixed inside the motor case, a plurality of pole teeth formed upright on the inner periphery of the stator core are arranged on the inner periphery of the air core coil. Thus, since the motor case is attached to the stator core, the outer peripheral surface of the air-core coil is covered and protected by the motor case. As a result, handling of the air-core coil is facilitated, and the assembly workability of the motor is improved.

  Hereinafter, a motor and a manufacturing method thereof according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a schematic configuration of a motor 10 according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the stator S of the motor 10. The motor 10 according to the present embodiment is a stepping motor, and as illustrated, a rotor R including a rotating shaft 12 and a cylindrical magnet 14 (permanent magnet) fixed to the outer peripheral surface of the rotating shaft 12, and a rotor R And a stator S arranged so as to surround the.

  The stator S is configured in a two-phase structure by a first stator member S1 and a second stator member S2 fixed back to back with the first stator member S1. In addition, since the basic structure of 1st stator member S1 and 2nd stator member S2 is the same, below, it attaches | subjects and demonstrates the same code | symbol about a common part.

  The stator members S1 and S2 include a stator core 16 serving as an inner stator core formed with a plurality of pole teeth 22 arranged so as to surround the rotor R, and an air-core coil arranged on the outer periphery of the pole teeth 22 20, and a motor case 18 having a case portion 18 a covering the outer periphery of the air-core coil 20 and a mounting surface 18 b on which the air-core coil 20 is placed. In the present embodiment, the motor case 18 is also used as an outer stator core.

  As shown in FIG. 2, the motor case 18 that is also an outer stator core has a case portion 18 a that covers the outer periphery of the air-core coil 20. The case portion 18a has a substantially cylindrical shape having an inner diameter slightly larger than the outer diameter of the air-core coil 20, and a mounting surface 18b on which the air-core coil 20 is placed is formed on one end edge. The other end edge is provided with an opening 18c. In this motor case 18, a plurality of pole teeth 22 are erected on the inner peripheral edge of the mounting surface 18 b, and an air-core coil 20 fixed to the inner surface of the motor case 18 is disposed on the outer periphery of these pole teeth 22. It has become so. The motor case 18 is formed by pressing a magnetic steel plate such as iron.

  A lead wire notch 18 d for leading a lead wire 20 a, which is a winding terminal of an air-core coil 20 fixed to the inner surface of the motor case 18, to the outside of the motor case 18 is provided in the opening 18 c of the motor case 18. Is provided. Similarly, the opening 18c of the motor case 18 is provided with a joining notch 18e into which a joining projection 16a of a stator core 16 which is an inner stator core described later is fitted at a position facing the lead line notch 18d. Yes.

  2 shows an example in which the case portion 18a of the motor case 18 is formed so as to cover the entire outer peripheral surface of the air-core coil 20, the shape of the motor case 18 is not limited to this, but the case There may be a state in which the opening or notch is partially formed in the portion 18a and the outer peripheral surface of the air-core coil 20 is partially exposed. 2 shows an example in which the pole teeth 22 are formed on the inner peripheral edge of the mounting surface 18b of the motor case 18 that is also the outer stator core, but the motor case and the outer stator core may be formed separately. . In such a case, the motor case may have a shape not having the pole teeth 22 as long as it has at least the case portion 18a and the mounting surface 18b.

  The air-core coil 20 fixed to the inner side of the motor case 18 is formed by winding a winding, such as a copper wire, provided with a self-bonding layer a plurality of times. This self-bonding layer is formed by winding the winding around a jig having a predetermined outer diameter while heating, so that the surface of the winding is fused and fixed to the shape of the air-core coil 20. For example, a material that is fused with a solvent after the winding is wound is used. Thereby, even if there is no coil bobbin, the shape of the air-core coil 20 can be maintained only by winding.

  FIG. 3 shows a top view and a cross-sectional view in a state where the air-core coil 20 is fixed to the inner surface of the motor case 18. The air-core coil 20 is arranged such that its outer peripheral surface faces the inner surface of the case portion 18a of the motor case 18 and its inner peripheral surface faces the group of pole teeth 22 of the motor case 18, so that the mounting surface of the motor case 18 is placed. It is fixed to the inner surface of 18b and / or case portion 18a by adhesion or the like. As described above, since the outer peripheral surface of the air-core coil 20 is covered and protected by the case portion 18a of the motor case 18, the coil winding of the air-core coil 20 is damaged, causing insulation failure or disconnection. Can be prevented. Therefore, handling of the air-core coil 20 becomes easy and the assembly workability of the motor 10 is improved.

  FIG. 4 shows a state in which an insulating member is interposed between the air-core coil 20 and the motor case 18. Here, an example in which a ring-shaped insulating sheet 24 a laid on the mounting surface 18 b of the motor case 18 and an insulating sleeve 24 b fitted on the inner peripheral surface of the air-core coil 20 are applied as the insulating members. Show.

  The insulating sheet 24a laid on the mounting surface 18b of the motor case 18 is formed of a nonmagnetic synthetic resin material having insulating properties and heat resistance. The insulating sheet 24 a has a shape substantially equal to the placement surface 18 b of the motor case 18 and is formed so as to substantially cover the end surface of the air-core coil 20. For this insulating sheet 24a, in addition to polyethylene terephthalate, polyester, and polyamideimide resin, an insulating synthetic resin material such as a thermosetting resin such as urethane, acrylic, or epoxy resin is preferably used.

  The insulating sleeve 24b fitted to the inner periphery of the air-core coil 20 is a non-magnetic resin material having insulating properties similar to the insulating sheet 24a, and has a thin cylindrical shape with both ends opened. Thermal expansion processing has been applied. The insulating sleeve 24b has an outer diameter substantially the same as or slightly smaller than the inner diameter of the air-core coil 20 before heating, and expands by heating. Therefore, when the insulating sleeve 24b before heating is inserted into the inner periphery of the air core coil 20 and then heated, the insulating sleeve 24b expands and is fitted to the inner periphery of the air core coil 20. As this insulating sleeve 24b, for example, PFA of fluororesin or FEP can be applied. Such an insulating and heat-resistant non-magnetic resin material is formed by, for example, extrusion molding or pultrusion to form a long cylinder having a predetermined outer diameter and thickness, and the long cylinder has a predetermined length. Insulating sleeve 24b can be obtained by cutting.

  Thus, by interposing the insulating sheet 24a between the air-core coil 20 and the motor case 18, the insulation between the air-core coil 20 and the motor case 18 is reliably maintained. In addition, when the air core coil 20 is mounted in the motor case 18 in such a state that the inner peripheral surface of the air core coil 20 is protected in advance by the thermally expandable insulating sleeve 24b or the like, the inner periphery of the air core coil 20 is obtained. A short circuit due to contact between the surface and the stator teeth 16 or the pole teeth 22 of the motor case 18 can be prevented.

  If the insulating sheet 24 a and / or the insulating sleeve 24 b are colored in a different color from the motor case 18 and the air core coil 20, the insulating sheet 24 a and the insulating sleeve 24 b are the air core coil 20 and the motor case 18. Even if it is in a state of being placed between the two, it becomes easy to visually recognize. Thereby, it can be easily confirmed by visual observation or the like whether the insulating sheet 24a and / or the insulating sleeve 24b are correctly attached.

  Further, in FIG. 4, an insulating sheet 24 a and an insulating sleeve 24 b are applied as insulating members, and between the inner peripheral surface of the air-core coil 20 and the pole teeth 22 of the motor case 18 and the end surface of the air-core coil 20. Although an example in which an insulating member is interposed between the motor case 18 and the mounting surface 18b of the motor case 18 is shown, the form of the insulating member is not limited to this. For example, the entire surface of the air-core coil 20 may be coated with an insulating material such as a synthetic resin material. In addition, a sleeve-like insulating member is attached to the outer peripheral surface of the air-core coil 20, and the insulating member is interposed between the outer peripheral surface of the air-core coil 20 and the inner peripheral surface of the case portion 18a of the motor case 18. There may be.

  Further, the air-core coil 20 shown in FIG. 4 is fixed to the mounting surface 18b of the motor case 18 and the inner peripheral surface of the case portion 18a via an adhesive 26a. When an adhesive is applied to the mounting surface 18b of the motor case 18 or the end surface of the air-core coil 20, and the air-core coil 20 is mounted on the mounting surface 18b and brought into close contact with the mounting surface 18b, the pushed-out adhesive is air-core. The space between the outer peripheral surface of the coil 20 and the inner surface of the case portion 18b of the motor case 18 is filled. As a result, a wide bonding area is secured, and the air-core coil 20 is firmly fixed to the inner surface of the motor case 18.

  FIG. 5 shows a state in which the air-core coil 20 is fixed to the inner surface of the motor case 18 via a thermal adhesive resin material. Here, the example which applies the heat bonding sheet | seat 26 formed in the sheet form as a heat bonding resin material is shown. The thermobonding sheet 26 is made of, for example, a thermosetting modified epoxy resin-based resin material or a thermoplastic polyester resin-based resin material, and has an inner diameter substantially equal to the inner diameter of the mounting surface 18b of the motor case 18 and the motor case 18. The case portion 18a has an outer diameter smaller than the inner diameter. The heat bonding sheet 26 is laid on the mounting surface 18b of the motor case 18, and the air core coil 20 is placed on and closely adhered to the mounting surface 18b. It is fixed to. By using this thermal bonding sheet 26, the time for curing the adhesive is shortened, and the air-core coil 20 can be fixed to the motor case 18 in a short time. Thereby, the productivity of the motor 10 is improved. Further, since the thermal adhesive resin is softer than the motor case 18, the coil winding is not easily damaged even when the air-core coil 20 is pressed, so that workability is improved.

  As shown in FIGS. 1 to 5, the air-core coil 20 is arranged so that the end surface on the side where the lead wire 20 a is provided faces the stator core 16, that is, on the opening 18 c side of the motor case 18. The motor case 18 is housed. As described above, the gap 28 is secured between the air core coil 20 and the stator core 16 by arranging the air core coil 20 and fixing it to the inner surface of the motor case 18. Thereby, it is possible to prevent the lead wire 20a of the air-core coil 20 from being sandwiched between the air-core coil 20 and the stator core 16 and being damaged or disconnected. Further, when the lead wire 20a of the air-core coil 20 is led out to the outside of the motor case 18, it is possible to prevent the lead wire 20a from coming into contact with the end face of the lead wire cutout 18d and breaking.

  After the air core coil 20 is fixed inside the motor case 18 in this way, the motor case 20 is covered with the stator core 16 so that the group of pole teeth 22 of the stator core 16 is arranged on the inner periphery of the air core coil 20. To wear. By fixing the air core coil 20 in the motor case 18 in advance as described above, the outer peripheral surface of the air core coil 20 is covered and protected by the motor case 18 when the air core coil is attached to the stator core 16. Therefore, handling of the air-core coil 20 becomes easy and the assembly workability of the motor 10 is improved.

  As shown in FIG. 2, a plurality of pole teeth 22 are erected in an annular shape at substantially equal intervals on the inner peripheral edge of the ring-shaped flange portion 16 b of the stator core 16. The pole teeth 22 provided on the stator core 16 and the pole teeth 22 provided on the motor case 18 are provided so as to be alternately arranged in the circumferential direction facing the inner peripheral surface of the air-core coil 20. Yes. The stator core 16 is formed by pressing a magnetic steel plate such as iron.

  As shown in FIGS. 1 and 2, the motor 10 according to the present embodiment includes two-phase stator members S1 and S2. The stator core 16 of the stator member S1 and the stator core 16 of the stator member S2 are: They are overlapped back to back and joined by welding or the like at the edges of the flange portions 16b, 16b.

  On the outer peripheral edge of the flange portion 16b, a joining protrusion 16a and a terminal block 30a are provided. The joining protrusion 16a is for joining the stator core 16 and the motor case 18 and extends from the outer peripheral edge of the flange portion 16b. When the motor case 18 to which the air-core coil 20 is fixed is attached to the stator core 16, the end surface of the flange portion 16b of the stator core 16 is accommodated in the inner periphery of the opening 18c of the motor case 18, but the joint protrusion 16a. Is inserted into the joining notch 18e of the motor case 18, so that the front end surface of the joining projection 16a is exposed from the joining notch 18e. The stator core 16 and the motor case 18 are joined by joining the end surface of the joining projection 16a and the peripheral portion of the joining notch 18d on the outer peripheral surface of the motor case 18 by welding or the like.

  The terminal block 30a is a table that supports the terminal 30 and is made of an insulating synthetic resin material, and is formed integrally with the stator core 16 by, for example, insert molding or outsert molding. As shown in FIGS. 1 and 2, the terminal block 30a is formed in a substantially square shape, and a groove 30b for routing the lead wire 20a of the air-core coil 20 toward the terminal 30 is formed at the center thereof. Has been. The terminals 30 are for transmitting current to the air-core coil 20, and the lead wires 20a of the air-core coil 20 are entangled with the terminals 30 and are electrically connected by solder or the like.

  The stator S of the motor 10 according to the present embodiment attaches a motor case 18 that is also an outer stator core to which an air-core coil 20 is fixed to each of the stator cores 16 and 16 that are inner stator cores joined back to back. Thus, the stator core 16 and the motor case 18 are joined and assembled.

  A rotor in which a magnet 14 is integrally provided around the rotary shaft 12 through a predetermined gap from the inner diameters of the pole teeth 22 of the stator core 16 and the motor case 18 at the center of the stator S thus configured. The motor 10 is manufactured by arranging R.

  As shown in FIG. 1, a mounting plate 32a used as a fixing plate when the motor 10 is mounted on a device is fixed to the motor case 18 of the first stator member S1, and the mounting plate 32a is fixed to the mounting plate 32a. A first radial bearing 32b that supports the rotary shaft 12 rotatably on the output side is fixed.

  In addition, a second radial bearing 32c is fixed to the motor case 18 of the second stator member S2 to rotatably support the rotary shaft 12 on the non-output side. Further, a side plate 32d is fixed to the motor case 18 of the second stator member S2, and the shaft end of the rotary shaft 12 is supported by the side plate 32d so as to be rotatable in the thrust direction. In the present embodiment, a structure in which the shaft end of the rotating shaft 12 is rotatably supported by the side plate 32d is adopted, but the rotating shaft 12 is biased in the axial direction (output side) instead of the side plate 32d. A force member may be attached.

  That is, the rotor R is rotatably supported by the first radial bearing 32b, the second radial bearing 32c, and the side plate 32d. Then, one end side of the rotating shaft 12 of the rotor R protrudes outward (output side) from the motor case 18 of the first stator member S1, and serves as an output shaft for rotational driving.

  Further, a resin washer 34 is disposed between the first radial bearing 32b and the magnet 14 to restrict the movement of the rotor R to the output side.

  In the motor 10 configured as described above, an alternating current is passed through the air-core coil 20 via the terminal 30 to generate a rotating magnetic field. This rotating magnetic field applies a magnetic rotational force to the magnet 14 of the rotor R, and the rotating shaft 12 is rotationally driven together with the magnet 14.

  In the above embodiment, an example in which the air core coil 20 is mounted after the stator cores 16 of the pair of stator members S1 and S2 are fixed to each other is shown. However, the air core coil 20 is fixed first. The motor case 18 is attached to and joined to the stator core 16 to manufacture the first stator member S1 and the second stator member S2, and the stator members S1 and S2 for these two phases are overlapped with each other back to back. You may make it fix by welding on the outer peripheral end surface of the stator core 16a.

  As described above, according to the motor 10 according to the embodiment of the present invention, since the air core coil 20 is fixed to the motor case 18, the outer peripheral surface of the air core coil 20 is covered with the case portion 18 a of the motor case 18. Protected. Therefore, at the time of assembling the motor 10, it is possible to prevent the coil winding of the air-core coil 20 from being damaged and causing insulation failure or disconnection. Further, since the air core coil 20 is fixed to the motor case 18, the lead wire 20 a of the air core coil 20 is sandwiched between the air core coil 20 and the flange portion 16 b of the stator core 18 and is disconnected. As a result, the assembly workability of the motor 10 is improved.

  Further, a plurality of pole teeth 22 are erected on the inner peripheral edge of the mounting surface 18b of the motor case 18 toward the stator core 16 side, and the pole teeth 22 of the stator core 16 and the pole teeth 22 of the motor case 18 are connected. Since they are arranged side by side, the number of pole teeth 22 arranged on the inner circumference of the air-core coil 20 can be increased, and the step angle of the motor 10 can be reduced.

  Further, since an insulating member made up of an insulating sheet 24a and an insulating sleeve 24b is interposed between the air core coil 20 and the motor case 18, the insulation between the air core coil 20 and the motor case 18 is provided. Is more reliably maintained, so that a short circuit can be prevented.

  Further, if the air core coil 20 is fixed to the inside of the motor case 18 via the heat bonding sheet 26, the air core coil 20 can be bonded to the motor case 18 in a short time, so that the motor 10 is produced. More improved.

  Further, since the end surface of the air core coil 20 on the side where the lead wire 20a is provided is disposed on the stator core 16 side, that is, on the opening 18c side of the motor case 18, the air core coil 20 fixed to the motor case 18 is provided. Is provided between the stator core 16 and the stator core 16, and the end surface of the air core coil 20 on the side where the lead wire 20 a is provided is disposed on the stator core 16 side. It is possible to prevent the core coil 20 and the stator core 16 from being damaged and damaged or disconnected.

  Further, since the stator core 16, the air-core coil 20, and the motor case 18 are provided as a pair, the pair of stator members S 1 and S 2 are integrally stacked with the stator cores S 1 and S 2 being back to back. By shifting the arrangement of the pole teeth 22 between the stator members S1 and S2, the step angle of the motor 10 can be further reduced. Further, since the magnetic force generated by energizing the air-core coil 20 becomes strong, the torque of the motor 10 can be improved.

  Further, according to the method of manufacturing the motor 10 according to the above embodiment, since the air core coil 20 is first fixed inside the motor case 18, the outer peripheral surface of the air core coil 20 is covered and protected by the motor case 18. . Therefore, handling of the air-core coil 10 becomes easy and the assembly workability of the motor 10 is improved.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment at all, Of course, it can implement in a various aspect in the range which does not deviate from the meaning of this invention.

1 is a cross-sectional arrow view showing a configuration of a motor according to a first embodiment of the present invention. FIG. 2 is an exploded perspective view showing a stator of the motor shown in FIG. 1. It is a figure which shows the state which fixed the air core coil to the motor case of the motor shown in FIG. It is a figure which shows the state which interposed the insulating member between the motor case shown in FIG. 3, and an air core coil. It is a figure which shows the state which fixed the motor case and air-core coil shown in FIG. 3 through the thermocompression-bonding sheet. It is sectional drawing which shows schematic structure of the motor generally known conventionally.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Motor 16 Stator core 18 Motor case 18a Case part 18b Mounting surface 20 Air-core coil 20a Lead wire 22 Polar tooth 24a Insulating sheet 24b Insulating sleeve 26 Thermal adhesive sheet 30 Terminal 30a Terminal block R Rotor S Stator

Claims (9)

A stator core in which a plurality of pole teeth are formed upright on the inner periphery, an air core coil disposed on the outer periphery of the plurality of pole teeth, and a motor case attached to the stator core so as to surround the air core coil In motors with
The air core coil is fixed to an inner peripheral surface of a case portion that covers an outer periphery of the air core coil of the motor case and / or a mounting surface on which the air core coil of the motor case is mounted. Motor.   A plurality of pole teeth are formed upright on the inner peripheral edge of the mounting surface of the motor case toward the pole tooth group on the stator core side, and the pole tooth group of the stator core and the pole tooth group of the motor case, The motor according to claim 1, wherein the motors are arranged so as to mesh with each other.   The motor according to claim 1, wherein an insulating member is interposed between the air-core coil and the motor case.   The insulating member includes an insulating sleeve attached to an inner peripheral surface and / or an outer peripheral surface of the air core coil and / or an insulating sheet interposed between the air core coil and the mounting surface of the motor case. The motor according to claim 3, wherein   The motor according to any one of claims 1 to 4, wherein the air-core coil is fixed to the inside of the motor case via a heat-adhesive resin material.   The motor according to any one of claims 1 to 5, wherein an end surface provided with a lead wire of the coil winding of the air-core coil is disposed so as to face the stator core.   A pair of stator members each including the stator core, the air-core coil, and the motor case are provided, and the pair of stator members are integrally overlapped with each other with the stator cores back to back. The motor in any one of. When manufacturing a motor in which an air core coil is disposed on the outer periphery of a stator core in which a plurality of pole teeth are formed upright on the inner peripheral edge, and a motor case is attached to the stator core so as to surround the air core coil,
The air core coil is fixed inside the motor case, and the motor case is attached to the stator core so that the pole teeth are arranged on the inner periphery of the air core coil. A method for manufacturing a motor. A method for manufacturing the motor according to claim 8, comprising:
A motor manufacturing method comprising a pair of stator members each including the stator core, the air-core coil, and the motor case, and the stator cores are fixed to each other back to back.

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