Motor and binding machine

Abstract

To provide a motor which is a surface magnet type and in which detachment of a magnet can be suppressed, and a reinforcement binding machine including the motor.SOLUTION: A motor 80 includes a rotor 82 and a stator 83. The rotor 82 includes a rotary shaft 82a, a rotor core 82b, a magnet 82c that is bonded to an outer circumference of the rotor core 82b, and has a projection 82i projecting along an extension direction of the rotary shaft 82a toward an end surface 82j of the rotor core 82b, and a sealing member 82d that fills between the projection 82i and the rotary shaft 82b and bonds the projection 82i and the rotary shaft 82a together. A reinforcement binding machine includes the motor 80.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a motor and a binding machine that is driven by the motor and binds objects such as reinforcing bars with wire. [Background technology]

[0002] Steel bars are used in concrete structures to increase their strength, and are tied together with wire to prevent the bars from shifting from their designated positions when the concrete is poured.

[0003] Conventionally, there has been proposed a binding machine known as a reinforcing bar binding machine, which wraps wire around two or more reinforcing bars and twists the wire wrapped around the reinforcing bars to bind the two or more reinforcing bars with the wire (see, for example, Patent Document 1).

[0004] In such a binding machine, the motor used for twisting the wire is required to rotate forward and backward at high speed and to control the angle with high precision. Also, in order to shorten the time required for each binding operation and to increase the binding speed, it is possible to reduce the inertia of the rotor, i.e., to reduce the weight of the rotor.

[0005] Therefore, it is possible to apply a motor with a structure called a surface permanent magnet (SPM) type, in which magnets are attached to the outer circumference of the rotor core. In an SPM motor, the rotor core is not provided on the outside of the magnet, so the volume of the rotor core is smaller, and the weight of the rotor can be reduced. This contributes to improving the binding speed. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 6791141 Summary of the Invention [Problem to be solved by the invention]

[0007] In SPM motors, the magnets are attached to the outer periphery of the rotor core, so there is an issue that the centrifugal force acting on the magnets when the rotor rotates can cause the magnets to peel off from the rotor core.

[0008] An object of the present invention is to provide a surface magnet type motor that can prevent magnets from peeling off, and a binding machine equipped with this motor. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems, the present invention is a motor comprising a rotor and a stator, wherein the rotor comprises a rotating shaft, a rotor core, a magnet attached to the outer periphery of the rotor core and having a protrusion that protrudes from an end face of the rotor core in the direction in which the rotating shaft extends, and a sealing member filled between the protrusion and the rotating shaft and bonding the protrusion and the rotating shaft.

[0010] The present invention also relates to a motor having a rotor and a stator, in which the rotor includes a rotating shaft, a rotor core, a plurality of magnets attached to the outer periphery of the rotor core and having protrusions that protrude from an end face of the rotor core in the direction in which the rotating shaft extends, and a sealing member filled between the plurality of protrusions and bonding the plurality of protrusions.

[0011] Furthermore, the present invention is a binding machine comprising a wire feeding unit that feeds a wire, a curl forming unit that forms a ring-shaped feed path that winds the wire fed by the wire feeding unit around a bundled material, a binding unit that twists the wire wound around the bundled material, and a motor that drives the binding unit, wherein the motor comprises a rotor and a stator, and the rotor comprises a rotating shaft, a rotor core, a magnet attached to the outer periphery of the rotor core and having a protrusion that protrudes from the end face of the rotor core in the direction in which the rotating shaft extends, and a sealing member that is filled between the protrusion and the rotating shaft and adheres the protrusion and the rotating shaft.

[0012] The present invention also provides a binding machine comprising a wire feeding section that feeds a wire, a curl forming section that forms a ring-shaped feed path that winds the wire fed by the wire feeding section around a bound material, a binding section that twists the wire wound around the bound material, and a motor that drives the binding section, wherein the motor comprises a rotor and a stator, and the rotor comprises a rotating shaft, a rotor core, a plurality of magnets attached to the outer periphery of the rotor core and having protrusions that protrude from an end face of the rotor core in the direction in which the rotating shaft extends, and a sealing member that is filled between the plurality of protrusions and adheres the plurality of protrusions.

[0013] In the present invention, a sealing material is filled between the rotating shaft and a protruding portion of the magnet protruding from the end face of the rotor core. Also, in the present invention, a sealing material is filled between adjacent protruding portions of the magnet protruding from the end face of the rotor core along the circumferential direction of the rotor core. Effect of the Invention

[0014] In the present invention, the sealing member bonds the rotating shaft and the protruding portion of the magnet. Also, in the present invention, the sealing member bonds adjacent protruding portions along the circumferential direction of the rotor core. This prevents the magnet from being rolled up outward due to its own inertial force, resulting in an unbalanced load, even when the rotor rotates, and prevents the magnet from peeling off from the rotor core. [Brief description of the drawings]

[0015] [Figure 1] 1 is a side view showing an example of the overall configuration of a reinforcing bar binding machine according to an embodiment of the present invention; FIG. [Diagram 2] 1 is a side cross-sectional view showing an example of a motor according to an embodiment of the present invention. [Figure 3A] FIG. 2 is a perspective view showing an example of a rotor according to the present embodiment. [Figure 3B] FIG. 2 is a side view showing an example of a rotor according to the present embodiment. [Figure 3C] FIG. 2 is a rear view showing an example of a rotor according to the present embodiment. [Figure 4A] 1 is a side cross-sectional view showing an example of a rotor according to an embodiment of the present invention. [Figure 4B]2 is a rear cross-sectional view showing an example of a rotor according to the present embodiment. FIG. [Figure 5A] FIG. 2 is an exploded perspective view showing an example of a rotor according to the present embodiment. [Figure 5B] 1 is a perspective view showing an example of a rotor according to an embodiment of the present invention before being filled with a sealing material. [Figure 6A] FIG. 11 is a perspective view showing an example of another embodiment of the rotor according to the present embodiment. [Figure 6B] FIG. 11 is a rear cross-sectional view showing an example of another embodiment of the rotor according to the present embodiment. [Figure 7A] FIG. 11 is a perspective view showing an example of another embodiment of the rotor according to the present embodiment. [Figure 7B] FIG. 11 is a rear cross-sectional view showing an example of another embodiment of the rotor according to the present embodiment. [Figure 8A] FIG. 11 is a perspective view showing an example of another embodiment of the rotor according to the present embodiment. [Figure 8B] FIG. 11 is a rear cross-sectional view showing an example of another embodiment of the rotor according to the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a motor according to the present invention and an example of a reinforcing bar binding machine as an embodiment of the binding machine according to the present invention will be described with reference to the drawings.

[0017] <Configuration example of the reinforcing bar binding machine according to this embodiment> FIG. 1 is a diagram showing an internal configuration as seen from the side, illustrating an example of the overall configuration of a reinforcing bar binding machine according to the present embodiment.

[0018] The reinforcing bar binding machine 1A is designed to be held by an operator and includes a main body 10 and a handle 11. The reinforcing bar binding machine 1A feeds the wire W in the forward direction indicated by the arrow F to wind it around the reinforcing bar S to be bound, and then feeds the wire W wound around the reinforcing bar S in the reverse direction indicated by the arrow R to wind it around the reinforcing bar S, and then twists the wire W to bind the reinforcing bar S with the wire W. The reinforcing bar binding machine 1A binds the reinforcing bars S with multiple wires W, two wires W in this example.

[0019] In order to achieve the above-mentioned functions, the reinforcing bar binding machine 1A is equipped with a magazine 2 that stores the wire W, a wire feeding unit 3 that feeds two wires W arranged side by side in the radial direction of the wire W, and a wire guide 4 that guides the two wires W fed to the wire feeding unit 3. The reinforcing bar binding machine 1A also is equipped with a curl forming unit 5 that forms a circular feeding path that winds the two wires W fed by the wire feeding unit 3 around the reinforcing bar S, and a cutting unit 6 that cuts the two wires W wound around the reinforcing bar S. The reinforcing bar binding machine 1A further includes a binding unit 7 that twists the two wires W wound around the reinforcing bar S, and a drive unit 8 that drives the binding unit 7.

[0020] The magazine 2 rotatably and detachably stores a reel 20 around which a long wire W is wound so as to be able to be paid out. The wire W is a wire made of a metal wire capable of plastic deformation, a wire made of a metal wire covered with resin, or a twisted wire. Two wires W are wound around the reel 20, and the two wires W can be pulled out from the reel 20 at the same time.

[0021] The wire feeding unit 3 includes a pair of feed gears 30 that clamp and feed two parallel wires W. In the wire feeding unit 3, the rotational motion of a feed motor (not shown) is transmitted to one of the pair of feed gears 30. In addition, the pair of feed gears 30 transmit the rotational motion of one feed gear 30 to the other feed gear 30 by meshing of the gear portions.

[0022] The wire feed unit 3 aligns the two wires W in the direction in which the pair of feed gears 30 are aligned. In addition, the wire feed unit 3 switches the rotation direction of the feed gear 30 by switching between forward and reverse rotation directions of a feed motor (not shown), thereby switching between forward and reverse feed directions of the wires W.

[0023] The wire guide 4 is disposed on the upstream side and the downstream side (not shown) of the feed gear 30 with respect to the feeding direction of the wire W fed in the forward direction. The wire guide 4 guides the two entering wires W between the pair of feed gears 30 by aligning them in the direction in which the pair of feed gears 30 are aligned.

[0024] The curl forming unit 5 is provided with a curl guide 50 that curls the two wires W fed by the wire feed unit 3 and regulates the parallel orientation of the two wires W, and an induction guide 51 that guides the two wires W that have been curled by the curl guide 50 to the bundling unit 7. The curl forming unit 5 curls the two wires W that are fed by the wire feed unit 3 and pass through the curl guide 50, thereby forming a circular feed path Ru as shown by the two-dot chain line in FIG. 1 that runs from the curl guide 50 through the induction guide 51 to the bundling unit 7.

[0025] The cutting unit 6 includes a fixed blade unit 60, a movable blade unit 61 that cuts the wire W in cooperation with the fixed blade unit 60, and a transmission mechanism 62 that transmits the operation of the binding unit 7 to the movable blade unit 61. The cutting unit 6 cuts the wire W by the rotational operation of the movable blade unit 61 with the fixed blade unit 60 as a fulcrum axis.

[0026] The bundling unit 7 includes a wire locking body 70 to which the wire W is locked, and a sleeve 71 that operates the wire locking body 70. The driving unit 8 includes a motor 80 and a reducer 81 that reduces speed and amplifies torque.

[0027] The reinforcing bar binding machine 1A includes a feed restricting unit 90 against which the tip of the wire W abuts at the end of the feed path of the wire W, which passes through the annular feed path Ru and is locked by the wire locking body 70. In addition, in the reinforcing bar binding machine 1A, the curl guide 50 and the guiding guide 51 of the curl forming unit 5 described above are provided at the front end of the main body 10. Furthermore, in the reinforcing bar binding machine 1A, an abutting unit 91 against which the reinforcing bar S abuts is provided between the curl guide 50 and the guiding guide 51 at the front end of the main body 10.

[0028] In the rebar tying machine 1A, a handle unit 11 extends downward from a main body unit 10. Furthermore, a battery 15 is detachably attached to the lower part of the handle unit 11. In the rebar tying machine 1A, a magazine 2 is provided in front of the handle unit 11. In the rebar tying machine 1A, the above-mentioned wire feeding unit 3, cutting unit 6, binding unit 7, drive unit 8 that drives the binding unit 7, etc. are stored in the main body unit 10.

[0029] The rebar tying machine 1A has a trigger 12 provided on the front side of a handle portion 11, and a switch 13 provided inside the handle portion 11. In the rebar tying machine 1A, a control unit (not shown) controls the feed motor and the motor 80 according to the state of the switch 13 pressed by operating the trigger 12.

[0030] <Configuration example of the motor according to this embodiment> FIG. 2 is a side cross-sectional view showing an example of a motor according to the present embodiment. FIG. 3A is a perspective view showing an example of a rotor according to the present embodiment, FIG. 3B is a side view showing an example of a rotor according to the present embodiment, and FIG. 3C is a rear view showing an example of a rotor according to the present embodiment. FIG. 4A is a side cross-sectional view showing an example of a rotor according to the present embodiment, and FIG. 4B is a rear cross-sectional view showing an example of a rotor according to the present embodiment. FIG. 5A is an exploded perspective view showing an example of a rotor according to the present embodiment, and FIG. 5B is a perspective view showing an example of a rotor according to the present embodiment before filling with a sealing member.

[0031] The motor 80 includes a rotor 82, a stator 83, a sensor 84, and a case 85. The motor 80 has a structure called a surface permanent magnet (SPM) type.

[0032] The rotor 82 includes a rotating shaft 82a, a rotor core 82b, a magnet 82c, a sealing member 82d, and a covering member 82e.

[0033] The rotating shaft 82a is rotatably supported by a bearing portion 85a provided in a case 85 and configured by a bearing or the like.

[0034] The rotor core 82b is made of metal and has a predetermined shape, and the rotary shaft 82a is attached to the center. The rotor core 82b also has a mounting portion 82f for the magnet 82c formed on the outer periphery. The mounting portion 82f has an uneven shape into which the magnet 82c fits.

[0035] The magnet 82c is a permanent magnet and is attached to the outer periphery of the rotor core 82b. The magnet 82c is shaped to fit into the mounting portion 82f of the rotor core 82b, and is attached to the mounting portion 82f with an adhesive 82g. The adhesive 82g is, for example, an epoxy resin.

[0036] In this example, four magnets 82c are attached at equal intervals along the circumferential direction of the rotor core 82b of the rotor 82. When the magnets 82c are attached to the attachment portions 82f of the rotor core 82b of the rotor 82, gaps 82h are formed between the magnets 82c adjacent to each other along the circumferential direction of the rotor core 82b.

[0037] The magnet 82c includes a protruding portion 82i. The protruding portion 82i protrudes from one end face 82j of the rotor core 82b in the direction in which the rotation shaft 82a extends. As a result, a gap 82k is formed between the protruding portion 82i, the rotation shaft 82a, and one end face 82j of the rotor core 82b. In addition, a gap 82h2 is formed between adjacent protruding portions 82i in the circumferential direction of the rotor core 82b.

[0038] The sealing member 82d is a resin having adhesiveness to the rotating shaft 82a, the rotor core 82b, the magnets 82c, etc., and is filled into the gap 82k. The sealing member 82d is, for example, an epoxy resin.

[0039] The sealing member 82d is filled into the gap 82k and solidified, and is thereby bonded to the rotating shaft 82a and the protruding portion 82i of the magnet 82c. The sealing member 82d is filled into the gap 82k and solidified, and is thereby bonded to the rotating shaft 82a, the end face 82j of the rotor core 82b, and the protruding portion 82i of the magnet 82c. As a result, at least the rotating shaft 82a and the protruding portion 82i of the magnet 82c are bonded by the sealing member 82d. It is more preferable that the rotating shaft 82a, the end face 82j of the rotor core 82b, and the protruding portion 82i of the magnet 82c are bonded by the sealing member 82d. In addition, the sealing member 82d is filled into the gap 82h. The sealing member 82d is filled into the gap 82h and solidified, and is thereby bonded to the rotor core 82b and the magnet 82c. As a result, the magnets 82c adjacent to each other along the circumferential direction of the rotor core 82b are bonded by the sealing member 82d. Furthermore, the sealing member 82d is filled into the gaps 82h2 between the protruding portions 82i adjacent to each other in the circumferential direction of the rotor core 82b. The sealing member 82d is filled into the gaps 82h2 and solidified, so that the sealing member 82d is bonded to the protruding portions 82i of the magnets 82c. As a result, the protruding portions 82i adjacent to each other in the circumferential direction of the rotor core 82b are bonded by the sealing member 82d.

[0040] The surface of the magnet 82c is painted to improve adhesion to the adhesive 82g and the sealing member 82d and to prevent rust. The surface of the magnet 82c is painted with, for example, epoxy resin. It is more preferable that the paint applied to the surface of the magnet 82c has affinity for the adhesive 82g and the sealing member 82d.

[0041] The covering member 82e covers the outer periphery of the magnet 82c attached to the mounting portion 82f of the rotor core 82b. The covering member 82e is made of a resin tube having heat shrinkability. The covering member 82e is contracted by heat to cover the outer periphery of the magnet 82c in a state in which a force is applied toward the inside in the radial direction of the rotor core 82b. After the outer periphery of the magnet 82c is covered with the covering member 82e, the gaps 82k and 82h are filled with the sealing member 82d, thereby restricting the range in which the sealing member 82d is filled. Note that the covering member 82e does not cover the rotating shaft 82a.

[0042] The stator 83 includes a stator core 83a and a coil 83b. In the motor 80, the stator 83 generates a rotating magnetic field, causing the rotor 82 to rotate.

[0043] The sensor 84 includes a Hall IC and is disposed at a position facing the protruding portion 82i of the magnet 82c. The sensor 84 detects magnetic flux, thereby making it possible to detect the rotation direction, rotation angle, rotation speed, etc. of the rotor 82.

[0044] <Example of operation of the reinforcing bar binding machine according to the present embodiment> Next, an operation of binding a reinforcing bar S with a wire W by the reinforcing bar binding machine 1A of this embodiment will be described with reference to each drawing.

[0045] When the reinforcing bar S is placed between the curl guide 50 and the induction guide 51 of the curl forming section 5 and the trigger 12 is operated, the feed motor (not shown) is driven in the forward rotation direction, and the two wires W clamped by a pair of feed gears 30 are fed in the forward direction indicated by the arrow F.

[0046] The wire W fed in the forward direction is fed to the curl guide 50 of the curl forming unit 5. By passing through the curl guide 50, the wire W is given a curling tendency to be wound around the reinforcing bar S along the circular feed path Ru.

[0047] The wire W having been curled by the curl guide 50 is guided by the induction guide 51 and is further fed in the forward direction by the wire feed unit 3, so as to be guided to the wire locking body 70. When the tip of the wire W is fed to a position where it abuts against the feed restriction unit 90, the drive of the feed motor (not shown) is stopped.

[0048] After the forward feed of the wire W is stopped, the motor 80 is driven in the forward rotation direction. The rotation of the sleeve 71 is restricted in the operating range where the wire locking body 70 locks the wire W. This converts the rotation of the motor 80 into linear movement, and the sleeve 71 moves forward, in the direction of the arrow A1. When the sleeve 71 moves forward, the wire W is locked by a predetermined operation of the wire locking body 70.

[0049] After the sleeve 71 has been advanced to a position where the wire W is held by the wire holding member 70, the rotation of the motor 80 is temporarily stopped, and the feed motor is driven in the reverse rotation direction.

[0050] As a result, the pair of feed gears 30 rotate in the reverse direction, and the wire W held between the pair of feed gears 30 is fed in the reverse direction indicated by the arrow R. By feeding the wire W in the reverse direction, the wire W is wound around the reinforcing bar S.

[0051] After winding the wire W around the rebar S and stopping the reverse rotation of the feed motor, the motor 80 is driven in the forward rotation direction, causing the sleeve 71 to move further forward as indicated by the arrow A1. The forward movement of the sleeve 71 is transmitted to the cutting unit 6 by the transmission mechanism 62, causing the movable blade unit 61 to rotate, and the wire W is cut at a predetermined position by the operation of the fixed blade unit 60 and the movable blade unit 61.

[0052] By driving the motor 80 in the forward rotation direction, the sleeve 71 is moved forward as indicated by the arrow A1 to cut the two wires W, and at almost the same time, the wire W is pushed forward by the wire locking body 70, and the tip and end sides of the wire W are bent toward the reinforcing bar S.

[0053] After the tip and end of the wire W are bent toward the rebar S, the motor 80 is further driven in the forward rotation direction, so that the sleeve 71 moves further forward. When the sleeve 71 moves to a predetermined position, the restriction on the rotation of the sleeve 71 is released.

[0054] As a result, the motor 80 is further driven in the forward rotation direction, causing the sleeve 71 to rotate and starting the operation of twisting the wire W locked by the wire locking body 70. When it is detected that the load on the motor 80 has reached a maximum due to the twisting of the wire W, the forward rotation of the motor 80 is stopped. Next, when the motor 80 is driven in the reverse rotation direction, the sleeve 71 moves in the rear direction, that is, in the direction of arrow A2, with its rotation restricted.

[0055] When the sleeve 71 moves rearward, the wire W is released from the wire locking body 70, and the wire W binding the reinforcing bar S comes out of the wire locking body 70.

[0056] <Examples of motor effects> In rebar binding machines, the motor used to twist the wire is required to repeatedly rotate forward and backward at high speed and to have precise angle control.

[0057] Rebar tying machines have traditionally used motors known as interior permanent magnet (IPM) motors. In an IPM motor, a long magnet is used in the axial direction relative to the rotor core, and the end of the magnet is configured to be close to a sensor consisting of a Hall IC or the like, ensuring control precision. Because the magnet in an IPM motor is embedded in the rotor core, the magnet is prevented from peeling off from the rotor core even when the rotor rotates and centrifugal force is applied to the magnet.

[0058] On the other hand, in order to increase the rebar tying speed and shorten the time required for each tying operation in a rebar tying machine, it is possible to reduce the inertia of the rotor, i.e., the weight of the rotor. To reduce the weight of the rotor, it is possible to make the rotor core and magnets smaller. However, making the rotor core and magnets smaller reduces the magnetic flux, which reduces the motor output.

[0059] Therefore, it is possible to apply an SPM motor, which has a configuration in which magnets are attached to the outer circumference of the rotor core. In an SPM motor, the rotor core is not provided on the outside of the magnets, so the volume of the rotor core is smaller, and the weight of the rotor can be reduced. This contributes to improving the binding speed.

[0060] On the other hand, to ensure the same level of control precision as an IPM motor, it is necessary to use a magnet that is long in the axial direction relative to the rotor core, and to configure the end of the magnet close to the Hall IC. With an SPM motor, this configuration results in the magnet protruding in the axial direction from the end face of the rotor core on the outside.

[0061] As a result, when the rotor rotates, an unbalanced load is generated in which the magnets are rolled up outward due to their own inertia, which can cause stress to concentrate at the ends of the adhesive surface between the magnets and the rotor core, reducing their robustness.

[0062] Therefore, the rotor 82 is configured such that a sealing member 82d is filled in a gap 82k between the rotating shaft 82a, the protruding portion 82i of the magnet 82c, and one end surface 82j of the rotor core 82b. The sealing member 82d filled in the gap 82k bonds at least the rotating shaft 82a and the protruding portion 82i of the magnet 82c. It is more preferable that the sealing member 82d filled in the gap 82k bonds the rotating shaft 82a and the protruding portion 82i of the magnet 82c, and the end surface 82j of the rotor core 82b. This prevents the magnet 82c from being rolled up outward due to its own inertia even when the rotor 82 rotates, and ensures robustness equivalent to that of an IPM motor without concentrating stress on the end of the bonding surface between the magnet 82c and the rotor core 82b.

[0063] The rotor 82 is also configured such that the sealing member 82d is filled in the gaps 82h between the magnets 82c adjacent to each other along the circumferential direction of the rotor core 82b. As a result, the magnets 82c adjacent to each other along the circumferential direction of the rotor core 82b are bonded with the sealing member 82d, thereby preventing the magnets 82c from peeling off from the outer periphery of the rotor core 82b. Furthermore, the rotor 82 is also configured such that the sealing member 82d is filled in the gaps 82h2 between the protruding parts 82i adjacent to each other along the circumferential direction of the rotor core 82b. As a result, the protruding parts 82i adjacent to each other along the circumferential direction of the rotor core 82b are bonded with the sealing member 82d, thereby preventing the magnets 82c from peeling off from the outer periphery of the rotor core 82b. The sealing member 82d may be of the same composition as the adhesive 82g.

[0064] FIG. 6A is a perspective view showing an example of another embodiment of the rotor of the present embodiment, and FIG. 6B is a rear cross-sectional view showing an example of another embodiment of the rotor of the present embodiment. In the rotor 82L, the protrusions 82i adjacent to each other along the circumferential direction of the rotor core 82b are bonded with a sealing member 82d filled in the gap 82h2 and the protrusion 82i side of the gap 82k between the rotating shaft 82a and the protrusions 82i. In contrast, in the rotor 82L, the sealing member 82d is not filled in the rotating shaft 82a side of the gap 82k. In this way, the protrusions 82i adjacent to each other along the circumferential direction of the rotor core 82b and the opposing protrusions 82i are bonded with the sealing member 82d, so that the magnet 82c is prevented from peeling off from the outer periphery of the rotor core 82b even if the protrusions 82i of the magnet 82c and the rotating shaft 82a are not bonded with the sealing member 82d. Furthermore, it is more preferable that the sealing member 82d filled in the gap 82k on the side of the protruding portion 82i be bonded to the end face 82j of the rotor core 82b.

[0065] FIG. 7A is a perspective view showing an example of another embodiment of the rotor of this embodiment, and FIG. 7B is a rear cross-sectional view showing an example of another embodiment of the rotor of this embodiment. In the rotor 82M, the protruding portion 82i of each magnet 82c is bonded to the rotating shaft 82a by the sealing member 82d filled in the gap 82k. It is more preferable that the sealing member 82d filled in the gap 82k bonds the rotating shaft 82a and the protruding portion 82i of the magnet 82c to the end face 82j of the rotor core 82b. In contrast, in the rotor 82M, the sealing member 82d is not filled in the gap 82h2 between the protruding portions 82i adjacent to each other along the circumferential direction of the rotor core 82b. In this way, even if the sealing member 82d is not filled in the gap 82h2, the protruding portions 82i adjacent to each other along the circumferential direction of the rotor core 82b and the opposing protruding portions 82i are bonded by the sealing member 82d filled in the gap 82k, and the magnet 82c is prevented from peeling off from the outer periphery of the rotor core 82b.

[0066] FIG. 8A is a perspective view showing an example of another embodiment of the rotor of the present embodiment, and FIG. 8B is a rear cross-sectional view showing an example of another embodiment of the rotor of the present embodiment. In the rotor 82N, the protrusions 82i adjacent to each other along the circumferential direction of the rotor core 82b are bonded with a sealing member 82d filled on the protrusion 82i side of the gap 82k between the rotating shaft 82a and the protrusions 82i. In contrast, in the rotor 82N, the gap 82h2 and the rotating shaft 82a side of the gap 82k are not filled with the sealing member 82d. In this way, the protrusions 82i adjacent to each other along the circumferential direction of the rotor core 82b and the opposing protrusions 82i are bonded with the sealing member 82d filled on the protrusion 82i side of the gap 82k, so that the magnet 82c is prevented from peeling off from the outer periphery of the rotor core 82b even if the protrusions 82i of the magnet 82c and the rotating shaft 82a are not bonded with the sealing member 82d.

[0067] Furthermore, the rotor 82 is configured such that the outer periphery of the magnet 82c is covered with a covering member 82e. The covering member 82e is made of a shrinkable resin tube, and covers the outer periphery of the magnet 82c when a force is applied toward the inside in the radial direction of the rotor core 82b. As a result, when the rotor 82 rotates, the covering member 82e also suppresses the occurrence of an unbalanced load in which the magnet 82c is rolled up outward due to its own inertial force. [Explanation of symbols]

[0068] 1A rebar tying machine, 2 magazine, 20 reel, 3 wire feed section, 30 feed gear, 5 curl forming section, 50 curl guide, 51 induction guide, 6 cutting section, 7 bundling section, 70 wire retaining body, 71 sleeve, 8 drive section, 80 motor, 81 reducer, 82, 82L, 82M, 82N rotor, 82a Rotating shaft, 82b rotor core, 82c magnet, 82d sealing member, 82e covering member, 82f mounting portion, 82g adhesive, 82h gap, 82i protrusion, 82j end face, 82k gap, 83 stator, 83a stator core, 83b coil, 84 sensor, 85 case, 85a bearing, W wire

Claims

1. A motor having a rotor and a stator, The rotor is A rotation axis; A rotor core; a magnet attached to an outer periphery of the rotor core and having a protrusion protruding from an end face of the rotor core along an extension direction of the rotation shaft; a sealing member that is filled between the protrusion and the rotating shaft and bonds the protrusion and the rotating shaft; A motor equipped with

2. A motor having a rotor and a stator, The rotor is A rotation axis; A rotor core; A plurality of magnets are attached to an outer periphery of the rotor core and have protrusions that protrude from an end face of the rotor core along an extension direction of the rotation shaft; a sealing member that is filled between the plurality of protruding portions and bonds the plurality of protruding portions; A motor equipped with

3. The sealing member is made of a resin having adhesive properties to the magnet and the rotating shaft. The motor according to claim 1 or 2.

4. The rotor core has a plurality of the magnets attached along a circumferential direction, and the sealing member is provided between adjacent magnets along the circumferential direction of the rotor core. The motor according to claim 3.

5. A coating member is provided to cover the outer periphery of the magnet. The motor according to claim 1 or 2.

6. The covering member has shrinkability.

6. The motor according to claim 5.

7. The sealing member is filled between the protrusion, the outer periphery of which is covered with the covering member, and the rotating shaft.

6. The motor according to claim 5.

8. The surface of the magnet is painted. The motor according to claim 3.

9. A wire feeding unit that feeds the wire; a curl forming section that forms a circular feed path for winding the wire fed by the wire feed section around a bundle; A bundling unit that twists the wire wound around the bundling object; A motor that drives the binding unit; Equipped with The motor includes a rotor and a stator. The rotor is A rotation axis; A rotor core; a magnet attached to an outer periphery of the rotor core and having a protrusion protruding from an end face of the rotor core along an extension direction of the rotation shaft; a sealing member that is filled between the protrusion and the rotating shaft and bonds the protrusion and the rotating shaft. Binding machine.

10. A wire feeding unit that feeds the wire; a curl forming section that forms a circular feed path for winding the wire fed by the wire feed section around a bundle; A bundling unit that twists the wire wound around the bundling object; A motor that drives the binding unit; Equipped with The motor includes a rotor and a stator. The rotor is A rotation axis; A rotor core; A plurality of magnets are attached to an outer periphery of the rotor core and have protrusions that protrude from an end face of the rotor core along an extension direction of the rotation shaft; a sealing member that is filled between the plurality of protrusions and bonds the plurality of protrusions. Binding machine.

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