JP2006304397A - Core of armature, armature and motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a transition wire stopping portion easily on the core of an armature, and to protect a transition wire stopped at the transition wire stopping portion against damage. <P>SOLUTION: The armature of a motor comprises a core 241 having a core back 244 and a plurality of teeth 243, a coil 242 formed on each teeth 243, and a transition wire 2421 connecting between the coils 242. In the core 241 comprising four sheets of laminated core plate, a transition wire stopping portion 2442 can be formed easily by forming two cuts 2441 in the outer circumference at a part between two adjacent teeth 243 in a first core plate 2411 of the core back 244, and the transition wire 2421 is hooked to the transition wire stopping portion 2442 and stopped on the inside of the outer circumferential surface of the core back 244. Consequently, the transition wire 2421 stopped at the transition wire stopping portion 2442 can be prevented from being damaged by touching a base plate 21. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric motor and an armature of the motor, and more particularly, to an armature core.

  2. Description of the Related Art Conventionally, a recording disk drive device such as a hard disk device has been provided with a spindle motor (hereinafter referred to as “motor”) that rotationally drives a recording disk. An inner rotor type motor is used in which field magnets are arranged inside a plurality of teeth arranged in a row.

  In an inner rotor type motor, a plurality of coils provided on a plurality of teeth of an armature core are connected by a jumper on the ring-shaped core back side that supports the plurality of teeth from the outer peripheral side. For example, when the alternating current that drives the motor is three-phase, the connecting wire extending from one coil is connected to the next coil across two coils in the circumferential direction. For this reason, a jumper is provided on the upper surface of the resin insulator attached to the core back so that the jumper does not come into contact with other coils to be straddled, and the jumper is hooked and locked to the outside of the protrusion. Is prevented from being located inside the core back.

  However, when an insulator is used for locking the crossover, the axial thickness of the armature core increases, which may hinder downsizing, and the insulator may be deformed or cracked. Furthermore, since the number of parts of the motor increases, the part cost and the cost related to assembly increase. Thus, various techniques for locking the crossover using the armature core have been proposed.

  For example, in Patent Document 1, in a stator core formed by laminating a plurality of thin metal plates, the thin metal plate provided with a rectangular portion protruding inward between each pole piece is the uppermost layer, and the rectangular portion is bent upward from the root. In addition, a technique for forming a cut-and-raised piece to which the crossover is locked is disclosed by bending the tip portion thereof outward. Thereby, the reduction of the number of parts related to the stator core and the miniaturization of the stator core are realized.

  Similarly, in Patent Document 2, in the uppermost layer of the metal core plate to be laminated, the connecting wire locking protrusion forming portion protruding inward from between each tooth is bent upward, and then the tip portion is bent outward. Crossing wire locking projections are formed. In the stator core of Patent Document 2, since the tip of the bent tip (substantially horizontal locking portion) does not exceed the outer peripheral surface of the annular core back, the horizontal downsizing of the stator core is for crossover locking. Inhibition by the protrusion is prevented.

Patent Document 3 discloses a technique for securing a sufficient winding space between adjacent teeth by providing a locking projection protruding outward from the outer peripheral surface of the stator core.
JP-A-9-322453 International Publication No. 2004/082104 Pamphlet Japanese Patent No. 3485810

  By the way, when a core plate is formed by laminating a plurality of core plates, a metal plate as a material for the core plate is usually supplied to a press machine, and metal pieces punched from the metal plate with a mold are in order. In the state of being held in the mold, the inside of the press machine is sequentially conveyed and bent.

  However, in the stator cores of Patent Document 1 and Patent Document 2, it is necessary to bend the tip portion of the stator core inwardly after being bent approximately 90 °, and then bend the tip portion further outward. It was difficult. In addition, when bending the protruding part after the core plate is removed from the progressive die, the man-hours related to the bending process increase, and the deformation of the core plate is likely to occur and the defect rate also increases. Resulting in.

  Further, in the stator core of Patent Document 3, the connecting wire is locked outside the outer peripheral edge of the core back of the stator core. Therefore, when the armature is attached to the base plate, the connecting wire is connected to the base plate due to a displacement of the attachment position or the like. Contact may damage or break the crossover. Further, the space required for mounting the armature also increases in the horizontal direction.

  The present invention has been made in view of the above problems, and an object of the present invention is to easily form a crossover locking portion on the armature core and prevent damage to the crossover wire locked to the crossover locking portion. It is said.

  The invention according to claim 1 is an armature core of an electric motor, wherein a plurality of teeth are arranged radially about the central axis with a tip directed toward a predetermined central axis, and the plurality of teeth A ring-shaped core back that supports the teeth from the outside, and two notches are formed in an outer peripheral portion of a portion between the two adjacent teeth of the core back, the two notches of the core back A connecting wire connecting the connecting wire connecting the two coils is passed through the two notches and hooks the connecting wire inside the outer peripheral surface of the core back. It is a stop.

  The invention according to claim 2 is the core of the armature according to claim 1, wherein the crossover locking portion is bent in a direction away from the main surface of the core back on which the crossover is passed. The bending angle with respect to the main surface of the crossover locking portion is 90 ° or less.

  The invention according to claim 3 is an armature core of an electric motor, wherein a plurality of teeth are arranged radially about the central axis with a tip directed toward a predetermined central axis, and the plurality of teeth A ring-shaped core back that supports the teeth from the outside, and two cuts are formed from the outer periphery of the outer periphery of the portion between the two adjacent teeth of the core back. The connecting wire connecting the two coils is passed through the two cutting portions and hung on the inner side of the outer peripheral surface of the core back at the portion between the two cutting portions. A crossover locking portion for locking, wherein the crossover locking portion is bent in a direction away from the main surface of the core back on which the crossover wire is passed, The bending angle with respect to the main surface is 90 ° or more. It is.

  A fourth aspect of the present invention is the armature core according to any one of the first to third aspects, wherein a tip of the crossover locking portion on the outer peripheral surface side is the outer peripheral surface of the core back. It is located inside or on the outer peripheral surface.

  The invention according to claim 5 is the core of the armature according to any one of claims 1 to 4, wherein the crossover locking portion is centered on the central axis at the distal end portion on the outer peripheral surface side. A protrusion extending on one side in the circumferential direction.

  The invention according to claim 6 is the core of the armature according to claim 5, wherein the crossover locking portion has a circumferential direction centering on the central axis at the distal end portion on the outer peripheral surface side. It further includes another protrusion extending to the other side.

  The invention according to claim 7 is the core of the armature according to any one of claims 1 to 6, wherein the core back is directed toward the central axis on the inner peripheral side of the crossover locking portion. A protruding portion is provided.

  The invention according to claim 8 is the core of the armature according to claim 1, wherein the plurality of teeth and the core back include a portion corresponding to the plurality of teeth and the core back. A plurality of core plates are formed by stacking, and the crossover locking portions are provided only on the first plate on the side where the crossovers are passed among the plurality of core plates, A recess that overlaps the crossover locking portion and the two notches is formed on the second plate that contacts the plate from the outer peripheral surface side.

  The invention according to claim 9 is the core of the armature according to claim 2 or 3, wherein the plurality of teeth and the core back include portions corresponding to the plurality of teeth and the core back. A plurality of core core plates are laminated, and the crossover locking portion is provided only on one of the plurality of core plates on the side where the crossover wires are passed.

  A tenth aspect of the present invention is the armature core according to the ninth aspect, wherein a recess that overlaps the crossover locking portion on the other plate that contacts the one plate is on the outer peripheral surface side. Formed from.

  The invention according to claim 11 is the core of the armature according to any one of claims 1 to 10, wherein the crossover locking portion is provided in all the portions between the two adjacent teeth of the core back. Is provided.

  The invention according to claim 12 is an armature of an electric motor, and is formed by winding a conductor wire around the core according to any one of claims 1 to 11 and the plurality of teeth of the core. A plurality of coils, and a crossover connecting the plurality of coils.

  A thirteenth aspect of the present invention is an electric motor, wherein the central shaft is between the armature according to the twelfth aspect and a stator portion to which the armature is attached and the armature. And a bearing mechanism that rotatably supports the rotor portion with respect to the stator portion around the central axis.

  In the present invention, the crossover locking portion can be easily formed, and damage to the crossover wire locked to the crossover locking portion can be prevented. In the invention of claim 4, the core can be reduced in size. According to the fifth and sixth aspects of the present invention, it is possible to reliably prevent the crossover from falling off the locking portion.

  According to the seventh aspect of the present invention, it is possible to prevent the magnetic field lines from being saturated in the core back. In the inventions according to claim 2 and claims 8 to 10, the crossover can be easily locked.

  FIG. 1 is a diagram showing an internal configuration of a recording disk drive device 60 including an electric spindle motor 1 (hereinafter referred to as “motor 1”) according to a first embodiment of the present invention. The recording disk drive device 60 is a hard disk device, and holds and rotates a disk-shaped recording disk 62 for recording information, an access unit 63 for writing and / or reading information on the recording disk 62, and the recording disk 62. An electric motor 1 and a housing 61 for housing the recording disk 62, the access unit 63, and the motor 1 in the internal space 110 are provided.

  As shown in FIG. 1, the housing 61 has an opening in the upper part and an opening of the first housing member 611 having a lidless box shape to which the motor 1 and the access unit 63 are attached to the inner bottom surface, and the opening of the first housing member 611. A plate-like second housing member 612 that forms the internal space 110 by covering the plate is provided. In the recording disk drive device 60, the second housing member 612 is joined to the first housing member 611 to form the housing 61, and the internal space 110 is a clean space that is extremely free of dust and dirt.

  The recording disk 62 is placed on the upper side of the motor 1 and is fixed to the motor 1 by the clamper 621. The access unit 63 includes a head 631 that magnetically writes and reads information in the vicinity of the recording disk 62, an arm 632 that supports the head 631, and an arm 632 that moves the head 631 and the recording disk 62. A head moving mechanism 633 that changes the relative position is provided. With these configurations, the head 631 accesses a required position of the recording disk 62 in the state of being close to the rotating recording disk 62, and writes and reads information.

  FIG. 2 is a longitudinal sectional view showing the configuration of the disk driving motor 1. The motor 1 is driven by a three-phase alternating current. FIG. 2 shows a cross section of a plane including a central axis J1 of the motor 1 (also a central axis of a core 241 of an armature 24 described later). The part is drawn with a broken line.

  As shown in FIG. 2, the motor 1 includes a stator portion 2 that is a fixed assembly and a rotor portion 3 that is a rotating assembly, and the rotor portion 3 is a bearing that uses fluid dynamic pressure by lubricating oil. It is supported so as to be rotatable with respect to the stator portion 2 around the central axis J1 via the mechanism. In the following description, for convenience, the rotor part 3 side is described as the upper side and the stator part 2 side is the lower side along the central axis J1, but the central axis J1 does not necessarily coincide with the direction of gravity.

  The rotor unit 3 includes a rotor hub 31 that holds each part of the rotor unit 3 and a field magnet 34 that is attached to the rotor hub 31 and arranged around the central axis J1. The rotor hub 31 is integrally formed of stainless steel or the like, has a substantially cylindrical shape centered on the central axis J1, and protrudes downward (that is, the stator portion 2 side) from the upper end portion of the shaft 311. A substantially disc-shaped disc portion 312 extending perpendicularly to the central axis J1 and a substantially cylindrical cylindrical portion 313 projecting downward at the outer edge of the disc portion 312 are provided. A substantially disc-shaped thrust plate 314 is attached to the lower end portion of the shaft 311.

  The stator portion 2 is a substantially cylindrical shape that is a part of a bearing mechanism that rotatably supports the rotor portion 3 while the base plate 21 that is a base portion that holds each portion of the stator portion 2 and the shaft 311 of the rotor portion 3 are inserted. Sleeve unit 22 and an armature 24 attached to the base plate 21 around the sleeve unit 22. The base plate 21 is a part of the first housing member 611 (see FIG. 1), and the first housing member 611 is pressed by pressing a plate-like member made of aluminum, an aluminum alloy, or a magnetic or nonmagnetic iron-based metal. It is formed integrally with other parts. The armature 24 generates a rotational force (torque) centered on the central axis J <b> 1 with the field magnet 34 disposed around the shaft 311.

  The armature 24 is attached to the base plate 21 from the upper side by press-fitting or bonding, and includes a core 241 formed by stacking four thin plate-like core plates, and a plurality of coils 242 provided at predetermined portions of the core 241. Is provided. Each of the four core plates forming the core 241 is a silicon steel plate having a thickness of 0.1 to 0.35 mm (more preferably, 0.2 mm). Hereinafter, in order to distinguish the four core plates, they are referred to as “first core plate 2411”, “second core plate 2412”, “third core plate 2413”, and “fourth core plate 2414” in order from the upper layer side.

  FIG. 3 is a plan view showing the core 241. As shown in FIG. 3, the core 241 has a plurality of (nine in the present embodiment) teeth 243 and a plurality of teeth 243 that are arranged radially about the center axis J <b> 1 with the tip directed toward the center axis J <b> 1. The ring-shaped core back 244 is supported from the outside (that is, the ends of the teeth 243 on the side far from the central axis J1 are connected and supported). The plurality of teeth 243 and the core back 244 are formed by laminating a first core plate 2411 to a fourth core plate 2414 (see FIG. 2) each having a portion corresponding to each of the plurality of teeth 243 and the core back 244. In each core plate, the portions corresponding to each of the plurality of teeth 243 and the core back 244 are integrally formed. Therefore, in the core 241, the plurality of teeth 243 and the core back 244 are magnetically connected. Yes.

  As shown in FIG. 2, in the armature 24, nine coils 242 are formed by winding a conductive wire around the nine teeth 243 of the core 241. Each of the nine coils 242 is formed by winding a conductive wire around the tooth 243 in two layers, and the diameter of the conductive wire is 0.05 to 0.3 mm (more preferably 0.1 mm). As described above, since the driving current of the motor 1 is a three-phase alternating current, the armature 24 has three coils 242 in every third of the nine coils 242 formed in the nine teeth 243 of the core 241. Are connected to each other by a crossover 2421. In the motor 1, each tooth 243 is bent upward on the central axis J <b> 1 side, and the end on the central axis J <b> 1 side opposes the outer peripheral surface of the field magnet 34, thereby Torque can be generated efficiently with the magnet 34 for use.

  FIG. 4 is a plan view showing the second core plate 2412. In the core 241, the third core plate 2413 and the fourth core plate 2414 also have the same shape as the second core plate 2412 shown in FIG. As shown in FIGS. 2 to 4, in the core 241, the first core plate 2411 of the core back 244 has two notches 2441 formed on the outer periphery of the portion between the two adjacent teeth 243, A portion between the two notches 2441 of the first core plate 2411 serves as a crossover locking portion 2442 that locks the crossover wire 2421 (see FIG. 2). The connecting wire 2421 is a conductive wire extending from the coil 242 and connects one coil 242 to another coil 242 or the circuit board 248. In FIG. 3, the circuit board 248 is indicated by a broken line.

  In the core 241, the crossover locking portion 2442 is provided only on the first core plate 2411 of the four core plates in all the portions between the two adjacent teeth 243 of the core back 244, and the first core plate The other three core plates including the second core plate 2412 in contact with 2411 overlap the crossover locking portion 2442 and the two cutout portions 2441 (it may only overlap the crossover locking portion 2442). A recess 2443 is formed from the outer peripheral surface side of the core back 244.

  The crossover locking portion 2442 is bent in a direction away from the upper main surface (hereinafter referred to as “upper surface”) of the core back 244, and the core back 244 of the crossover locking portion 2442. The bending angle θ (see FIG. 2) with respect to the upper surface of the substrate is 90 ° or less. Further, the outer end of the crossover locking portion 2442 (that is, the outer peripheral surface side of the core back 244) is positioned inside the outer peripheral surface of the core back 244. In other words, the distance in the radial direction around the central axis J1 between the outer tip of the crossover locking portion 2442 and the central axis J1 is the center between the outer peripheral surface of the core back 244 and the central axis J1. It is smaller than the distance in the radial direction around the axis J1. The crossover locking portion 2442 is formed so that the tip thereof is located on the outer peripheral surface of the core back 244 (that is, on the virtual surface when the outer peripheral surface of the core back 244 is extended upward). May be.

  Further, in the core back 244, a protruding portion 2444 that protrudes toward the central axis J1 is formed on the inner peripheral side of the crossover locking portion 2442 in all the portions between the two adjacent teeth 243. The protruding portion 2444 is provided across the first core plate 2411 to the fourth core plate 2414.

  FIG. 5 is a plan view showing the base plate 21. As shown in FIG. 5, the base plate 21 has a substantially disk shape, and includes three armature support portions 214 that protrude upward from the upper surface of the base plate 21. The armature support portions 214 are arranged at equal intervals on the circumference centered on the central axis J1, and come into contact with the core back 244 (see FIG. 3) of the armature 24 attached to the base plate 21 to lower the armature 24. Support from the side. Note that the three armature support portions 214 are formed when the base plate 21 is formed by pressing.

  As shown in FIGS. 2 and 5, a substantially cylindrical sleeve mounting portion 216 that protrudes upward toward the rotor portion 3 about the central axis J <b> 1 is provided at the center portion of the base plate 21. As shown in FIG. 2, the sleeve unit 22 includes a substantially cylindrical sleeve 221 into which the shaft 311 is inserted, and a substantially cylindrical sleeve housing 222 fixed to the outer periphery of the sleeve 221 with an adhesive or the like. It is inserted into the attachment portion 216 and attached to the base plate 21.

  The sleeve 221 is inserted with a slight gap between the sleeve housing 222 and the inner peripheral surface of the sleeve housing 222 (that is, the sleeve 221 is fitted with a clearance), and is fixed to the sleeve housing 222 with an adhesive. The sleeve 221 is a porous member, and is formed by pressing a powdered raw material into a mold and pressing and compacting it, followed by sintering, and then placing the sintered member in a mold again and compressing. Raw materials include various types of metal powders, metal compound powders, non-metal powders, etc. (for example, mixed powders of iron (Fe) and copper (Cu), mixed powders of copper and tin (Sn), copper, tin and lead) (Pb mixed powder, iron and carbon (C) mixed powder).

  A flange portion 224 is integrally formed on the upper portion of the sleeve housing 222, which is a protruding portion that protrudes outward with respect to the central axis J <b> 1 along the outer periphery of the sleeve unit 22. Also, the opening on the lower end side of the sleeve unit 22 is closed by a substantially disc-shaped seal cap 23, whereby the opening on the lower side of the sleeve mounting portion 216 of the base plate 21 is closed by the sleeve housing 222 and the seal cap 23. Is done.

  As shown in FIG. 5, in the base plate 21, a plurality (nine in this embodiment) penetrates the base plate 21 vertically in a region corresponding to a plurality of teeth 243 (see FIG. 2) around the sleeve mounting portion 216. Hole portion 211 is formed. As shown in FIG. 2, in a state where the armature 24 is attached to the base plate 21, the lower portions of the plurality of coils 242 do not protrude below the lower surface of the base plate 21 and correspond to the base plate 21. It is accommodated in the hole 211. As a result, the motor 1 can be thinned without excessively thinning the base plate 21.

  In the stator part 2, the hole 211 into which the coil 242 is inserted is filled with an adhesive, so that the coil 242 is fixed and the hole 211 is sealed. In addition, the base plate 21 covers a sheet-like sealing member 212 (for example, a flexible circuit board or a nameplate) that closes the plurality of holes 211 from the side opposite to the side on which the armature 24 of the base plate 21 is attached (that is, the lower side). Prepare. The seal member 212 has an annular shape centered on the central axis J1, and is attached to the lower main surface of the base plate 21 via an adhesive layer (or adhesive layer).

  Next, a bearing mechanism using fluid dynamic pressure that rotatably supports the rotor portion 3 of the motor 1 on the stator portion 2 will be described. As shown in FIG. 2, in the motor 1, between the lower surface of the disk portion 312 of the rotor hub 31 and the upper end surface of the sleeve housing 222, between the inner peripheral surface of the sleeve 221 and the outer peripheral surface of the shaft 311, the sleeve 221. Between the lower end surface of the thrust plate 314 and the upper surface of the thrust plate 314, between the lower surface of the thrust plate 314 and the upper surface of the seal cap 23, and the outer peripheral surface of the flange portion 224 of the sleeve 221 and the cylindrical portion 313 of the rotor hub 31. A minute gap is provided between the peripheral surface. These gaps are continuously filled with lubricating oil to form a so-called full-fill bearing mechanism.

  The outer peripheral surface of the flange portion 224 of the sleeve housing 222 is an inclined surface whose outer diameter gradually decreases downward, and the inner diameter of the inner peripheral surface of the cylindrical portion 313 of the rotor hub 31 facing the outer peripheral surface of the flange portion 224. Is assumed to be constant. As a result, the lubricating oil interface in the gap between the flange portion 224 and the cylindrical portion 313 becomes a meniscus shape due to capillary action and surface tension to form a taper seal, and this gap serves as an oil buffer to lubricate. Oil spill is prevented.

  On the upper end surface of the sleeve housing 222 and the lower end surface of the sleeve 221, a groove (for example, a spiral shape) for generating pressure toward the central axis J1 with respect to the lubricating oil when the rotor portion 3 rotates is provided. Grooves) are formed, and the thrust dynamic pressure bearing portion is constituted by these end surfaces and the surfaces facing these end surfaces.

  Further, on the surfaces of the shaft 311 and the sleeve 221 facing each other, grooves for generating fluid dynamic pressure in the lubricating oil (for example, provided above and below the inner peripheral surface of the sleeve 221 with respect to the direction toward the central axis J1). Herringbone grooves and the like are formed, and these surfaces constitute a radial dynamic pressure bearing portion.

  In the motor 1, the rotor unit 3 can be rotated with high accuracy and low noise by supporting the rotor unit 3 in a non-contact manner through lubricating oil by a bearing mechanism that uses fluid dynamic pressure. In particular, in a full-fill bearing mechanism, since air does not intervene in the bearing, the lubricating oil is caused by abnormal contact between the shaft 311 and the sleeve 221 caused by bubbles generated in the lubricating oil, or by expansion of air inside the bearing. Leakage etc. are further suppressed. Further, in the motor 1, since the sleeve 221 is a porous member obtained by pressure-molding a powdery raw material, the lubricating oil can be held with high holding force in the bearing mechanism and particles such as particles in the lubricating oil can be retained. Impurities can be adsorbed to keep the lubricating oil clean.

  As described above, in the motor 1, the gap between the sleeve unit 22 (that is, the sleeve 221 and the sleeve housing 222), the rotor hub 31, and the seal cap 23 is filled with lubricating oil, which is a fluid. In some cases, the rotor unit 3 is supported using fluid dynamic pressure caused by lubricating oil. The rotor unit 3 is rotationally driven with respect to the stator unit 2 around the central axis J1, whereby the recording disk 62 (see FIG. 1) attached to the rotor unit 3 is rotationally driven.

  Next, manufacture of the armature 24 and attachment to the base plate 21 will be described. When the armature 24 is manufactured, first, a flat silicon steel plate (or another type of electromagnetic steel plate) is punched out by a mold, and the first core plates 2411 to 4th shown in FIGS. A core plate 2414 is formed. At this time, in the first core plate 2411, two notches 2441 (see FIG. 3) are formed in the outer peripheral portions between the teeth 243, and in the second core plate 2412 to the fourth core plate 2414, the teeth 243 are formed. Concave portions 2443 (see FIG. 4) are formed on the respective outer peripheral portions.

  Subsequently, the end on the central axis J1 side of the portion corresponding to the plurality of teeth 243 of each core plate is pressed and bent upward, and the portion between the two notches 2441 of the first core plate 2411 (Ie, the crossover locking portion 2442) is pressed and bent upward. Thereafter, four core plates are laminated and fixed to each other by caulking, laser welding, or the like, and an insulating resin is applied to the surface of the laminated core plates by electrodeposition coating or powder coating to form the core 241. The

  FIG. 6 is a plan view showing a state in which the armature 24 is being manufactured. When the core 241 is formed, as shown in FIG. 6, a winding wire 91 (only a needle is shown) is used to wind a conductive wire in two layers on one tooth 243 to form a first coil 242. Is done. At this time, the conductor of the first layer is wound from the side opposite to the center axis J1 side of each tooth 243 toward the center axis J1, and then the conductor of the second layer is directed outward from the center axis J1 side. Is wound.

  When the first coil 242 is formed, on the upper surface side of the core back 244, the conducting wire from the coil 242 (that is, the crossover 2421) is guided clockwise in FIG. It passes through the notch portion 2441 on the near side of the adjacent crossover locking portion 2442. The connecting wire 2421 passes through the lower side of the connecting wire locking portion 2442 (which can be called the outside when the bending angle θ (see FIG. 2) of the connecting wire locking portion 2442 is large). And is guided further clockwise on the upper surface side of the core back 244. As shown in FIG. 6, the connecting wire 2421 is passed through the two notches 2441 and hooked on the connecting wire locking portion 2442, so that it is inside the outer peripheral surface of the core back 244 and inside the core back 244. It is locked outside the peripheral surface.

  The crossover wire 2421 further passes under the two crossover wire engaging portions 2442 arranged adjacent to each other in the circumferential direction in the clockwise direction, and counts clockwise from the tooth 243 on which the first coil 242 is formed. It is led to the third tooth 243. Then, the conductive wire is wound around the third tooth 243 again to form the second coil 242.

  As described above, the connecting wire 2421 from the first coil 242 is locked to the three connecting wire locking portions 2442 on the upper side of the core back 244 (that is, the (+ Z) side). The outside of the tooth 243 is bypassed and passed to the second coil 242. In other words, the connecting wire 2421 connecting the first coil 242 and the second coil 242 is hooked and locked by the three connecting wire locking portions 2442 between the two coils. Thereby, the connecting wire 2421 connecting the two coils 242 does not prevent the winding of the conducting wire performed later on the two teeth 243 sandwiched between the two coils 242.

  When the second coil 242 is formed, the connecting wire 2421 from the second coil 242 is counted clockwise from the second coil 242 while being engaged with the three connecting wire engaging portions 2442. Guided to the third tooth 243, the third coil 242 is formed. The connecting wire 2421 from the third coil 242 is guided to the circuit board 248 (see FIG. 3) while being locked to the connecting wire locking portion 2442 as necessary, and is soldered to the electrode on the circuit board 248. Be joined.

  Next, three coils 242 are sequentially formed on three teeth 243 arranged every three of the six teeth 243 where the coils 242 are not yet formed, and then connected to the circuit board 248. Then, three coils 242 are sequentially formed on the remaining three teeth 243 arranged every three, and then connected to the circuit board 248 to complete the manufacture of the armature 24. At this time, the crossover wire 2421 passed from one coil 242 to the next coil 242 is inside the outer peripheral surface of the core back 244 and the inner peripheral surface by the three crossover locking portions 2442 as described above. It is locked outside.

  Thereafter, as shown in FIG. 2, the armature 24 is attached to the base plate 21 while the outer peripheral surface of the core back 244 is brought into contact with the base plate 21. At this time, the armature 24 may be press-fitted into the base plate 21, or may be bonded to a portion of the base plate 21 that comes into contact with the core back 244 with an adhesive applied in advance. The method for manufacturing the armature 24 and the method for attaching the armature 24 to the base plate 21 are substantially the same in the second and third embodiments described later.

  As described above, in the core 241 of the motor 1, the two notches 2441 are formed in the outer peripheral portion of the core back 244 between the two adjacent teeth 243, and the connecting wire connecting the two coils 242. 2421 is passed through the two notches 2441 and hooked to the crossover locking portion 2442, thereby being locked inside the outer peripheral surface of the core back 244. As a result, when the armature 24 is attached to the base plate 21, it is possible to prevent the connecting wire 2421 locked to the connecting wire locking portion 2442 from being damaged due to contact with the base plate 21 or the like. Further, since the two notches 2441 can be easily formed in the process of forming the core 241, the crossover locking portion 2442 can be easily formed.

  Since the outer end of the crossover locking portion 2442 of the core 241 is located on the inner side of the outer peripheral surface of the core back 244 or on the outer peripheral surface of the core back 244, the core in the radial direction centered on the central axis J1 241 can be miniaturized. As a result, the motor 1 can be downsized. Further, when the armature 24 is attached to the base plate 21, interference between the crossover locking portion 2442 and the base plate 21 can be easily avoided, so that the shape of the base plate 21 can be prevented from becoming complicated.

  In the core 241, the protrusion 2444 is provided on the inner peripheral side of the part where the notch 2441 is formed, so that the width of the core back 244 which is a magnetic path is partially reduced at the part where the notch 2441 is formed. Is prevented. As a result, saturation of magnetic field lines in the core back 244 can be prevented.

  In the core 241, the crossover locking portion 2442 is bent upward so that the gap (notch portion 2441) on both sides of the crossover locking portion 2442 is increased. Therefore, the connecting wire 2421 can be easily passed through the notch portion 2441, and the connecting wire 2421 can be easily locked to the connecting wire locking portion 2442. Further, since the crossover locking portion 2442 is provided only on the first core plate 2411, when the crossover wire 2421 is hooked on the crossover locking portion 2442 (that is, the crossover wire 2421 is crossed over the crossover locking portion). Since the crossover line 2421 only needs to be moved slightly in the vertical direction when passing under the 2442), the crossover line 2421 can be locked more easily.

  In addition, the second core plate 2412 to the fourth core plate 2414 are provided with a recess 2443 that overlaps the crossover locking portion 2442 (and the cutout portion 2441) of the first core plate 2411. When hooking on the wire locking portion 2442, the winding machine 91 can be easily inserted below the crossing wire locking portion 2442, so that the crossover wire 2421 can be locked more easily.

  In the core 241, by setting the bending angle θ of the crossover locking portion 2442 with respect to the upper surface of the core back 244 to be 90 ° or less, the crossing of the crossover 2421 that is locked is displaced and dropped from the crossover locking portion 2442. Can be prevented. Further, the crossover locking portion 2442 can be easily formed as compared with the case where the crossover locking portion 2442 needs to be bent larger than 90 °. For example, when the core 241 is formed by sequentially transporting a plurality of core plates in the press machine, the crossover locking portion 2442 in the progressive die can be easily bent.

  As described above, from the viewpoint of facilitating the locking of the connecting wire 2421, the connecting wire locking portion 2442 is preferably bent upward, but the viewpoint of further reducing the thickness of the core 241. The crossover locking portion 2442 of the first core plate 2411 is not bent upward (that is, the (folding) angle θ is set to 0 °) and is perpendicular to the central axis J1 in the radial direction. It may be stretched.

  In this case, in order for the connecting wire 2421 to pass under the connecting wire locking portion 2442, at least the second core plate 2412 may be provided with a recess 2443 that overlaps the connecting wire locking portion 2442 and the notch portion 2441. is necessary. Then, by providing the recess 2443 in the second core plate 2412, the connecting wire 2421 can be easily locked when the connecting wire 2421 is hooked on the connecting wire locking portion 2442. As described above, in the motor 1, the angle θ is preferably set to 0 ° or more and 90 ° or less according to the conditions required for the motor 1.

  Next, a motor according to a second embodiment of the present invention will be described. FIG. 7 is an enlarged view showing a part of the core 241a of the motor according to the second embodiment. As shown in FIG. 7, the core 241a includes a crossover locking portion 2442a having a shape different from that of the crossover locking portion 2442 of the core 241 shown in FIG. Other configurations are the same as those in FIGS. 2 to 4, and the same reference numerals are given in the following description.

  As in the first embodiment, the core 241a is formed by stacking the first core plate 2411 to the fourth core plate 2414 (see FIG. 2), and the tip is center axis J1 (see FIG. 3). 9 teeth 243 arranged radially about the central axis J1 and a ring-shaped core back 244 that supports the nine teeth 243 from the outside (see FIG. 3).

  In the core 241a, two notch portions 2441 are formed on the outer peripheral portion of the portion between the two adjacent teeth 243 in the first core plate 2411, and between the two notch portions 2441 of the first core plate 2411. A part becomes the crossover locking part 2442a which has a shape different from 1st Embodiment. As shown in FIG. 7, the crossover locking portion 2442 a includes two protrusions 2445 extending at both ends in the circumferential direction around the central axis J <b> 1 at the outer peripheral surface side end of the core back 244. In other words, the crossover locking portion 2442a is T-shaped in plan view.

  The crossover locking portion 2442a is provided only on the first core plate 2411 of the four core plates in all the portions between the two adjacent teeth 243 of the core back 244, and contacts the first core plate 2411. In the other three core plates including the second core plate 2412 in contact therewith, a recess 2443 that overlaps with the notch 2441 (and the crossover locking portion 2442a) is formed from the outer peripheral surface side (see FIG. 4).

  Similarly to the first embodiment, the crossover locking portion 2442a is bent in a direction away from the top surface of the core back 244, and the top surface of the core back 244 of the crossover locking portion 2442a. The bending angle with respect to is 90 ° or less. Further, the outer end of the crossover locking portion 2442 a (that is, the outer peripheral surface side of the core back 244) is located on the inner side or on the outer peripheral surface of the core back 244. In the core back 244, a protruding portion 2444 that protrudes toward the central axis J1 is formed on the inner peripheral side of the portion where the notch portion 2441 is formed in all the portions between the two adjacent teeth 243. The protruding portion 2444 is provided across the first core plate 2411 to the fourth core plate 2414.

  In the manufacture of the armature of the motor according to the second embodiment, as in the first embodiment, the connecting wire 2421 (see FIG. 6) from one coil 242 is on the upper surface of the core back 244 in FIG. Is passed through the notch portion 2441 on the near side of the crossover locking portion 2442a, and then passed through the underside of the crossover locking portion 2442a to the notch portion 2441 on the opposite side. It is hung on the crossover locking portion 2442a. Thereby, the connecting wire 2421 is locked inside the outer peripheral surface of the core back 244 and outside the inner peripheral surface of the core back 244, as in the first embodiment. The connecting wire 2421 is guided to the teeth 243 where the next coil 242 is formed via the three connecting wire locking portions 2442a.

  As described above, in the motor core 241 a according to the second embodiment, the crossover locking portion 2442 a is formed by forming the notch portion 2441 in the core back 244, as in the first embodiment. When the armature 24 is attached to the base plate 21, it can be easily formed and the crossover wire 2421 is locked inside the outer peripheral surface of the core back 244 by being hooked on the crossover lock portion 2442a. In addition, it is possible to prevent the connecting wire 2421 locked to the connecting wire locking portion 2442a from being damaged due to contact with the base plate 21 or the like.

  In the core 241a, in particular, the connecting wire locking portion 2442a includes two protrusions 2445 extending in the circumferential direction at the outer end portion, so that the connecting wire 2421 can be engaged with the connecting wire 2421a in the course of locking to the connecting wire locking portion 2442a. Even when a force pulling away from the central axis J1 is applied, the connecting wire 2421 is caught by the projection 2445, so that the connecting wire 2421 is reliably prevented from falling off from the connecting wire locking portion 2442a. Can do.

  In the core 241a, as in the first embodiment, the outer end of the crossover locking portion 2442a is located inside or on the outer peripheral surface of the core back 244, so that the central axis J1 is Miniaturization of the core 241a in the radial direction as the center can be realized. In addition, by providing the protruding portion 2444, the width of the core back 244 that is a magnetic path is prevented from being partially reduced, and saturation of the magnetic lines of force in the core back 244 can be prevented.

  In the core 241a, the connecting wire 2421a is bent upward so that the connecting wire 2421 can be easily passed through the notch portion 2441, as in the first embodiment. The line 2421 can be easily locked to the crossover locking part 2442a. In addition, since the crossover locking portion 2442a is provided only on the first core plate 2411, when the crossover wire 2421 is hooked on the crossover locking portion 2442a, the crossover wire 2421 is only moved slightly in the vertical direction. Therefore, the connecting wire 2421 can be locked more easily. Furthermore, the winding machine 91 can be easily inserted under the crossover locking portion 2442a by the recess 2443 (see FIG. 4) formed in the second core plate 2412 to the fourth core plate 2414. The connecting wire 2421 can be locked more easily.

  FIG. 8 is a plan view showing an example of another preferred crossover locking portion. As shown in FIG. 8, the crossover locking portion 2442b of the core 241b is arranged at one end in the circumferential direction centering on the central axis J1 (see FIG. 3) at the tip on the outer peripheral surface side of the core back 244 (this embodiment). Then, a protrusion 2445 extending in the counterclockwise direction in FIG. 8 is provided. In other words, the crossover locking portion 2442b is L-shaped in plan view.

  When the crossover wire 2421 (see FIG. 6) is passed through the core 241b, the crossover wire 2421 from one coil 242 is guided clockwise in FIG. 8 on the upper surface of the core back 244, and the crossover wire locking portion. After passing through the notch portion 2441 on the near side of 2442b, it passes through the lower side of the crossover locking portion 2442b and passes through the notch portion 2441 on the opposite side, thereby being hooked on the crossover locking portion 2442b. Thereby, the connecting wire 2421 is locked inside the outer peripheral surface of the core back 244 and outside the inner peripheral surface of the core back 244, as in the first embodiment.

  In the core 241b, the connecting wire locking portion 2442b is provided with a protrusion 2445 extending to one side in the circumferential direction at the outer tip, so that a force to be pulled to the outer periphery side of the core back 244 is applied to the connecting wire 2421. Even in this case, it is possible to prevent the connecting wire 2421 from falling off from the connecting wire locking portion 2442b. In particular, when the connecting wire 2421 is passed clockwise (that is, when it is hooked through the notch portion 2441 on the side where the projection 2445 is provided with respect to the connecting wire locking portion 2442b), the connecting wire is temporarily assumed. Even if the crossover line 2421 is pulled in the direction away from the central axis J1 during the locking to the locking part 2442b, the crossover line 2421 can be reliably prevented from falling off from the crossover locking part 2442b.

  Also in the core 241b, the crossover locking portion 2442b can be easily formed as in the first embodiment, and the crossover wire 2421 is hooked on the crossover locking portion 2442b, so that the electric It is possible to prevent the connecting wire 2421 locked to the connecting wire locking portion 2442b from being damaged due to contact with the base plate 21 or the like when the child is attached.

  Next, a motor according to a third embodiment of the present invention will be described. FIG. 9 is an enlarged view showing a part of the core 241c of the motor according to the third embodiment. As shown in FIG. 9, in the core 241 c, a cutout portion 2441 a is provided on the outer peripheral side of the core back 244 instead of the cutout portion 2441 shown in FIG. 3, and is formed at a site between two adjacent teeth 243. A portion between the two cut portions 2441a becomes a crossover locking portion 2442c that is hooked and locked by the crossover wire 2421 (see FIG. 6) that connects the two coils 242. Other configurations are the same as those in FIGS. 2 to 4, and the same reference numerals are given in the following description.

  The notch portion 2441a is formed on the first core plate 2411 without cutting a part of the first core plate 2411 of the core 241c formed by stacking the first core plate 2411 to the fourth core plate 2414 (see FIG. 2). The outer peripheral portion is formed by cutting a predetermined length from the outer peripheral edge by press working or the like. The crossover locking portion 2442 c is provided on the first core plate 2411 in all the portions between the two adjacent teeth 243 of the core back 244. Moreover, the 2nd core plate 2412 thru | or the 4th core plate 2414 is formed with the recessed part 2443 which overlaps with the crossover locking part 2442c from the outer peripheral surface side (refer FIG. 4).

  In the core 241c, the connecting wire locking portion 2442c is bent in a direction away from the upper surface of the core back 244, and the bending angle of the connecting wire locking portion 2442c with respect to the upper surface of the core back 244 is 90 ° or less. It is said. Further, the outer end of the crossover locking portion 2442c (that is, the outer peripheral surface side of the core back 244) is located on the inner side or on the outer peripheral surface of the core back 244. In the core back 244, in all the portions between the two adjacent teeth 243, the protruding portion 2444 that protrudes toward the central axis J1 (see FIG. 3) on the inner peripheral side of the portion where the notch portion 2441a is formed. Is formed.

  When the connecting wire 2421 (see FIG. 6) is passed through the core 241c, the connecting wire 2421 from one coil 242 is guided clockwise in FIG. 9 on the upper surface of the core back 244, and the connecting wire locking portion. After passing through the notch portion 2441a on the near side of 2442c (more precisely, the gap in the notch portion 2441a expanded by bending the connecting wire locking portion 2442c upward), the connecting wire locking portion 2442c By passing through the lower side through the notch portion 2441a on the opposite side, it is hung on the crossover locking portion 2442c. Thereby, the connecting wire 2421 is locked inside the outer peripheral surface of the core back 244 and outside the inner peripheral surface of the core back 244, as in the first embodiment.

  Similarly to the first embodiment, the core 241c can easily form the crossover locking portion 2442c, and the crossover wire 2421 locked to the crossover locking portion 2442c is in contact with the base plate 21. It is possible to prevent damage due to the like.

  Note that the crossover locking portion 2442c, which is a portion between the two notches 2441a, is centered on the central axis J1 at the distal end portion on the outer peripheral surface side of the core back 244, as in the second embodiment. Protrusions 2445 extending on one side or both sides in the circumferential direction may be provided.

  As mentioned above, although embodiment of this invention has been described, this invention is not limited to the said embodiment, A various change is possible.

  Only from the viewpoint of preventing damage due to contact with the outside of the connecting wire 2421, as shown in FIG. 10, a connecting wire locking portion 2442 d in which the outer tip protrudes outward from the outer peripheral surface of the core back 244 is formed. May be.

  In addition, as shown in FIG. 11, between the adjacent teeth 243, the two notch portions 2441 are provided in the first core plate 2411 so as to be largely separated from each other, and the portion 2446 between the crossover locking portions 2442 e is also a crossover wire. It may be bent upward together with the locking portion 2442e. In the example shown in FIG. 11, the inner peripheral edge of the core back 244 (corresponding part) of the second core plate to the fourth core plate is the inner peripheral edge of the core back 244 (corresponding part) of the first core plate 2411. overlapping. Further, the outer peripheral edge of the core back 244 of the second core plate to the fourth core plate is the inner peripheral end of the crossover locking portion 2442e in the first core plate 2411 (that is, the crossover locking portion 2442e is bent). A portion 2446 between the connecting wire locking portion 2442e and the connecting wire locking portion 2442e is formed to protrude outward from the outer peripheral surface of the second core plate or the fourth core plate. Thus, in the example shown in FIG. 11, in the first core plate 2411 to the fourth core plate, the width of the core back 244 is sufficiently secured over the entire circumference, so that the magnetic field lines in the core back 244 are saturated. The protrusion 2444 (refer FIG. 3) for preventing may be abbreviate | omitted. In addition, instead of the portion 2446 between the crossover locking portion 2442e and the crossover locking portion 2442e being bent upward, the entire core back 244 is placed at the end of each tooth 243 opposite to the central axis J1 side. Then, it may be bent upward to form an inverted conical surface.

  The crossover locking portion according to the above embodiment is not necessarily formed only on the first core plate 2411, and may be formed on the first core plate 2411 and the second core plate 2412, for example. The core plate 2411 to the fourth core plate 2414 may be formed. Further, even if the crossover locking portion is formed on any one of the second core plate 2412 to the fourth core plate 2414 or a plurality of continuous core plates of the second core plate 2412 to the fourth core plate 2414. In this case, a concave portion 2443 is formed on the upper (and lower) core plate of the core plate on which the crossover locking portion is formed so as to overlap the crossover locking portion and the cutout portion.

  The core of the armature 24 is not necessarily formed by stacking four core plates. For example, the core may be formed by stacking two core plates, and is made of one silicon steel plate. It may be a thing. One coil 242 is not necessarily formed on each tooth 243, and one coil 242 may be provided across a plurality of teeth 243 (so-called distributed winding may be used).

  As shown in FIG. 12, the crossover wire 2421 may be temporarily passed through the lower side of the tooth 243 between the crossover wire engaging portions 2442 adjacent to each other. As a result, the connecting wire 2421 is pulled toward the inner peripheral side of the core back 244 on both sides of each connecting wire locking portion 2442, so that the bending of the connecting wire 2421 is further suppressed and the connecting wire locking portion 2442 falls off. Is reliably prevented.

  As the motor bearing mechanism according to the above-described embodiment, for example, a so-called air dynamic pressure bearing using air as a fluid may be used. Further, the bearing mechanism does not necessarily need to utilize fluid dynamic pressure, and may be a ball bearing, for example.

  The motor according to the above embodiment may be used as a drive source for a device other than the hard disk device (for example, a disk drive device such as a removable disk device).

It is a figure which shows the internal structure of the recording disk drive device based on 1st Embodiment. It is a longitudinal cross-sectional view which shows the structure of a motor. It is a top view which shows a core. It is a top view which shows a 2nd core plate. It is a top view which shows a base plate. It is a top view which shows the mode in the middle of manufacture of an armature. It is a figure which expands and shows a part of core concerning 2nd Embodiment. It is a top view which shows the other example of a crossover locking part. It is a figure which expands and shows a part of core which concerns on 3rd Embodiment. It is a figure which expands and shows a part of core. It is a figure which expands and shows a part of core. It is a top view which shows a core.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor 2 Stator part 3 Rotor part 21 Base plate 22 Sleeve unit 23 Seal cap 24 Armature 31 Rotor hub 34 Field magnet 241, 241a-241c Core 242 Coil 243 Teeth 244 Core back 2411 1st core plate 2412 2nd core plate 2413 Third core plate 2414 Fourth core plate 2421 Crossover wire 2441 Notch portion 2441a Notch portion 2442, 2442a to 2442e Crossover lock portion 2443 Concave portion 2444 Protruding portion 2445 Protruding portion J1 Central axis

Claims (13)

An armature core of an electric motor,
A plurality of teeth radially arranged around the central axis with the tip directed toward the predetermined central axis;
A ring-shaped core back that supports the plurality of teeth from the outside;
With
Two notches are formed in the outer peripheral portion of the portion between the two adjacent teeth of the core back, and the portion between the two notches of the core back connects the two coils The armature core is a crossover locking portion that locks the crossover wire on the inner side of the outer peripheral surface of the core back by being passed through the two cutout portions. An armature core according to claim 1,
The crossover locking portion is bent in a direction away from the main surface of the core back on which the crossover is passed, and the bending angle of the crossover locking portion with respect to the main surface is 90 ° or less. An armature core characterized by being. An armature core of an electric motor,
A plurality of teeth radially arranged around the central axis with the tip directed toward the predetermined central axis;
A ring-shaped core back that supports the plurality of teeth from the outside;
With
Two notches are formed on the outer periphery of the portion between the two adjacent teeth of the core back from the outer peripheral edge, and the portion between the two notches of the core back has two coils. A connecting wire connecting portion that connects the connecting wire to the inside of the outer peripheral surface of the core back by being passed through the two cut portions and hooked.
The crossover locking portion is bent in a direction away from the main surface of the core back on which the crossover is passed, and the bending angle of the crossover locking portion with respect to the main surface is 90 ° or less. An armature core characterized by being. An armature core according to any one of claims 1 to 3,
The armature core, wherein a tip of the crossover locking portion on the outer peripheral surface side is located on an inner side or on the outer peripheral surface of the core back. The core of the armature according to any one of claims 1 to 4,
The core of the armature, wherein the crossover locking portion includes a protruding portion extending to one side in a circumferential direction centering on the central axis at a distal end portion on the outer peripheral surface side. An armature core according to claim 5,
The core of the armature, wherein the crossover locking portion further includes another protrusion that extends to the other end in the circumferential direction centering on the central axis at the distal end on the outer peripheral surface side. The core of the armature according to any one of claims 1 to 6,
The core of the armature, wherein the core back includes a protruding portion that protrudes toward the central axis on the inner peripheral side of the crossover locking portion. An armature core according to claim 1,
The plurality of teeth and the core back are formed by laminating a plurality of thin plate-like core plates having portions corresponding to the plurality of teeth and the core back,
The crossover locking portion is provided only on the first plate on the side where the crossover wires are crossed among the plurality of core plates, and the crossover locking portion and the second plate abutting on the first plate An armature core, wherein a recess that overlaps the two notches is formed from the outer peripheral surface side. An armature core according to claim 2 or 3,
The plurality of teeth and the core back are formed by laminating a plurality of thin plate-like core plates having portions corresponding to the plurality of teeth and the core back,
The core of the armature, wherein the crossover locking portion is provided only on one of the plurality of core plates to which the crossover is passed. An armature core according to claim 9,
A core of an armature, wherein a concave portion that overlaps the crossover locking portion is formed on the other plate coming into contact with the one plate from the outer peripheral surface side. An armature core according to any one of claims 1 to 10,
The armature core, wherein the crossover locking portions are provided in all the portions between two adjacent teeth of the core back. An armature of an electric motor,
A core according to any one of claims 1 to 11,
A plurality of coils formed by winding conductive wires around the plurality of teeth of the core;
Crossovers connecting the plurality of coils;
An armature comprising: An electric motor,
A stator portion having an armature according to claim 12 and a base portion to which the armature is attached;
A rotor portion having a field magnet that generates torque centered on the central axis with the armature;
A bearing mechanism that rotatably supports the rotor portion with respect to the stator portion around the central axis;
A motor comprising:

Images