JP4574454B2 - Electric motor - Google Patents

Description

  The present invention relates to a synchronous motor such as an AC servomotor.

  As a conventional rotary motor, in a rotary motor comprising a stator in which a coil bobbin is fitted to magnetic pole teeth of a stator core and coils are concentratedly wound around the coil bobbin, and a rotor arranged on the inner diameter side of the stator, the stator core is The coil bobbin, which is divided into a ring-shaped outer yoke and a plurality of the magnetic teeth fixed to the inner diameter side thereof, and is fitted to each of the magnetic pole teeth, is formed by a thin portion that can be bent on the outer diameter side of the magnetic pole teeth. There are some which are connected in a non-annular form (see, for example, Patent Document 1).

  Further, as a stator of another conventional electric motor, a coil and a coil bobbin body which is formed of a coil bobbin around which the coil is wound and which has a connection part, and which can be rotatably connected to another coil bobbin by the connection part, A magnetic tooth that is fixedly attached to the coil bobbin, and a fixed iron core that fits and holds a plurality of coil bobbin bodies that are attached and fixed to the magnetic pole tooth in an annular shape by the connecting portion, and the connecting portion is concave Some are formed in a structure in which the part and the convex part are rotatably fitted, and the connection part is formed by an insertion pin and an insertion hole (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 07-245895 Japanese Patent Laid-Open No. 11-089128

  However, in the conventional rotary electric motor described in Patent Document 1, the coil bobbins that are respectively fitted to the magnetic pole teeth are connected non-annularly by thin portions that can be bent on the outer diameter side of the magnetic pole teeth. When winding a coil on a coil bobbin, the thin part connecting each coil bobbin is bent to widen the gap at the tip of the coil bobbin, preventing the winding nozzle of the winding machine from interfering with the adjacent coil bobbin, and Although the degree of freedom in handling is ensured, the thin-walled portion is bent in the opposite direction after winding to form a ring-shaped coil bobbin body, so the interval between the coil bobbins is due to plastic deformation of the thin-walled portion due to bending. It grows and grows. Therefore, when the coil bobbin body is formed, the inner diameter of the stator tends to vary from one magnetic tooth to another, and it is difficult to increase the roundness, which affects the torque ripple and cogging torque of the rotary motor. there were.

  In the case where the connection part of the coil bobbin described in Patent Document 2 is formed in a structure in which the concave part and the convex part are fitted so as to be able to rotate, both the convex parts must be covered with the concave part. The connection cannot be ensured, and the rotation angle of the coil bobbin becomes small and the degree of freedom in handling the winding nozzle of the winding machine cannot be secured.

  In addition, when the connection part of the coil bobbin is formed of an insertion pin and an insertion hole, the number of parts increases by the amount of the insertion pin, and particularly in a small motor, assembly work for inserting the insertion pin into the insertion hole is complicated. There was a problem.

  The present invention has been made in view of the above, and it is possible to widen the gap at the tip end of the coil bobbin without causing plastic deformation in the connection portion of the coil bobbin, and the degree of freedom in handling the winding nozzle of the winding machine is increased. An object of the present invention is to obtain an electric motor that is secured and does not require complicated assembly work. Another object of the present invention is to obtain an electric motor capable of accurately positioning and fixing a coil bobbin to a stator iron core.

  In order to solve the above-described problems and achieve the object, an electric motor of the present invention has a shaft arm that cantilever a shaft on one side and a bearing arm that has a shaft hole on the other side. A plurality of base flanges formed in the shape of a rectangular flat plate, a winding drum provided at the center of the base flange, and a tip flange provided at the tip of the winding drum. The plurality of coil bobbins are rotatably connected to each other by fitting each shaft cantilevered by the shaft arm into each shaft hole provided in the bearing arm of the adjacent coil bobbin. A coil ring is formed in which a coil is wound around the winding body, and the tip flange is connected to the inner peripheral side in a ring shape, and a groove in which the shaft arm and the bearing arm are fitted is formed. The fixed iron core that fits and holds the A rotor that is rotatably supported, characterized in that it comprises a.

  According to the present invention, it is possible to obtain an electric motor in which the degree of freedom in handling the winding nozzle of the winding machine is secured, the assembling work is not complicated, and the coil bobbin is accurately positioned and fixed on the stator core.

  Embodiments of an electric motor according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment FIG. 1-1 is a front view showing an embodiment of an electric motor according to the present invention, FIG. 1-2 is a bottom view thereof, and FIG. 2-1 is a front view showing a coil bobbin alone. 2-2 is a bottom view thereof, FIG. 3-1 is a front view showing coil bobbins connected in a row, FIG. 3-2 is a bottom view thereof, and FIG. It is a front view which shows the bending state of the winding nozzle and coil bobbin at the time of winding. FIG. 5-1 is a front view showing a coil ring in which coil bobbins are connected in a ring shape, FIG. 5-2 is a bottom view of the same, and FIG. 6-1 is a diagram in which the coil bobbin is fitted to a stator core. It is a front view which shows a state, and FIG. 6-2 is a partially broken bottom view same as the above.

  As shown in FIGS. 1-1 and 1-2, in the electric motor 100 according to the embodiment, the fixed iron core 3 formed in a cylindrical shape by stacking steel plates and the coil bobbin 1 around which the coil 2 is wound are formed in a ring shape. Nine coil rings 21 connected and fitted to the fixed iron core 3, a rotor iron core 6 formed by laminating steel plates and formed in a substantially cylindrical shape, and six coils attached to the outer peripheral side of the rotor iron core 6 to generate magnetic flux. A plate-shaped permanent magnet 5 and a substantially cylindrical rotor 8 having a rotating shaft 7 fitted in the center of the rotor core 6 and rotatably installed in a coil ring 21. ing. The permanent magnet 5 may be fixed to the outer peripheral surface of the rotor core 6.

  As shown in FIGS. 2-1 and 2-2, a single coil bobbin 1 includes a base flange 1a formed in a rectangular flat plate shape, and a prismatic winding body 1b disposed at the center of the base flange 1a. And a rectangular plate-shaped tip flange 1c disposed at the tip of the winding drum portion 1b.

  A pair of cylindrical shaft arms 1d projecting from the left corner of the base flange 1a and parallel to the base flange 1a are molded. The shaft arm 1d is cantilevered with a shaft 1e parallel to the base flange 1a. Molded. A pair of disk-shaped bearing arms 1f having a shaft hole 1g parallel to the base flange 1a projecting from the right corner of the base flange 1a is molded. The outer diameter of the shaft arm 1d and the outer diameter of the bearing arm 1f are formed to be the same. The inner peripheral surface of the front end flange 1 c is formed in an arc shape centered on the axis of the electric motor 100.

  As shown in FIGS. 1-1 and 1-2, the fixed iron core 3 is formed in a circular shape at the outer periphery, and the inner periphery is a regular hexagon (generally, a coil ring 21 to be described later is fitted) Regular 3n square: n is an integer). At the corner portion of the regular hexagon, nine semicircular grooves 3a that fit the outer peripheral portions of the shaft arm 1d of the base flange 1a and the bearing arm 1f are formed.

  Next, an assembling method of the coil ring 21 will be described with reference to FIGS. As shown in FIGS. 3A and 3B, the shaft 1e of the base flange 1a is fitted into the shaft hole 1g of the adjacent coil bobbin 1 (the bearing arm 1f is bent outward to be fitted), and nine pieces The bobbin rows 20 are assembled by connecting the coil bobbins 1 (generally 3n pieces: n is an integer) to each other so as to be rotatable. Since the shaft 1e is integrally formed with the shaft arm 1d, there is no complication of assembling work for fitting a separate shaft to the bearing arm 1f.

  Next, as shown in FIG. 4, the bobbin row 20 is bent so that the front end flanges 1c and 1c are separated from each other, installed in a winding machine (not shown), and the nozzle 30 of the winding machine is driven to The coil 2 is wound around the part 1b. Since the adjacent tip flanges 1c and 1c are separated from each other and the gap between the nozzle 30 of the winding machine is increased, the interference between the nozzle 30 and the tip flange 1c does not occur, and the nozzle 30 is routed. A degree of freedom is secured.

  As shown in FIG. 3-2, the U-phase wire 2a is wound around the adjacent coil bobbins 11-13, the V-phase wire 2b is wound around the adjacent coil bobbins 14-16, and the adjacent coil bobbins 17-19 are wound around the coil bobbins 17-19. W-phase wire 2c is wound. One end of U-phase line 2a, V-phase line 2b, and W-phase line 2c are connected to each other at a middle point 2d, and the other end of U-phase line 2a, V-phase line 2b, and W-phase line 2c is connected to a three-phase AC power source (not shown). Connected.

  As shown in FIGS. 5A and 5B, the bobbin row 20 on which the coil is wound is removed, and the tip flange 1c is set on the inner peripheral side, and the shaft 1e of the coil bobbin 11 and the shaft of the coil bobbin 19 are disposed. The holes 1g are fitted and connected in a regular nine-angle ring shape to form a coil ring 21.

  Next, with reference to FIGS. 6A and 6B, a method for assembling the coil ring 21 and the fixed iron core 3 will be described. The coil ring 21 whose outer shape is formed in a regular nine-ring shape is inserted into the fixed core 3 while fitting the outer peripheral portions of the shaft arm 1d and the bearing arm 1f of the base flange 1a into the semicircular groove 3a of the fixed core 3. And fit. After fitting, the coil ring 21 is fixed to the fixed iron core 3 by molding with resin or the like.

  The shaft 1e and the shaft hole 1g of the base flange 1a have a clearance fit so that the coil bobbins 1 can be rotated smoothly, and after inserting the coil ring 21 into the fixed iron core 3, each coil bobbin 1 is moved outward. By pressing, the base flange 1a is displaced outward by the clearance and contacts the inner peripheral surface 3b of the fixed iron core 3, and the radial position of the coil bobbin 1 is positioned.

  The semicircular groove 3a of the fixed iron core 3 has a width substantially the same as the outer diameter of the shaft arm 1d and the bearing arm 1f and a depth slightly larger than the radius of the shaft arm 1d and the bearing arm 1f. By doing so, the circumferential position of the coil bobbin 1 is positioned by the semicircular groove 3 a, and the radial position of the coil bobbin 1 is positioned by the inner peripheral surface 3 b of the fixed core 3. In a state where each coil bobbin 1 is pressed against the inner peripheral surface 3 b of the fixed iron core 3, both are molded with a resin or the like, and each coil bobbin 1 is positioned and fixed to the fixed iron core 3. The coil bobbin 1 is precisely positioned in the circumferential direction and the radial direction by the semi-circular groove 3a and the inner peripheral surface 3b of the fixed iron core 3 that are precisely machined.

  The disc-shaped bearing arm 1f provided on the coil bobbin 1 may be partially thinned or the base portion may be thinned so that the disk-shaped bearing arm 1f is easily bent when fitted to the shaft 1e of the shaft arm 1d. . Further, a notch for inserting the shaft 1e may be provided between the shaft hole 1g and the outer peripheral portion.

  As described above, the electric motor according to the present invention is excellent in productivity and useful as a highly accurate synchronous electric motor.

It is a front view which shows embodiment of the electric motor concerning this invention. It is the same bottom view. It is a front view which shows a coil bobbin single-piece | unit. It is the same bottom view. It is a front view which shows the coil bobbin connected with 1 row. It is the same bottom view. It is a front view which shows the bending state of the winding nozzle and coil bobbin at the time of coil winding. It is a front view which shows the coil ring with which the coil bobbin was connected by the ring shape. It is the same bottom view. It is a front view which shows the state which fitted the coil bobbin to the stator core. It is a partially broken bottom view of the same.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coil bobbin 1a Base flange 1b Winding trunk part 1c End flange 1d Shaft arm 1e Shaft 1f Bearing arm 1g Shaft hole 2 Coil 3 Fixed iron core 3a Groove (semicircular groove)
3b Inner peripheral surface 8 Rotor 21 Coil ring 100 Electric motor

Claims (3)

A shaft arm that cantilever the shaft on one side, a bearing arm that has a shaft hole on the other side, a base flange formed in a rectangular flat plate shape, and a central portion of the base flange A plurality of coil bobbins each having a winding drum section disposed at a front end of the winding drum section, and the plurality of coil bobbins cantilevered by the shaft arm. After the respective shafts are fitted to the respective shaft holes provided in the bearing arms of the adjacent coil bobbins so as to be pivotable to each other, the coil is wound around the winding body portion, and then the tip flange is moved to the inner peripheral side. A coil ring connected in a ring shape,
A groove in which the shaft arm and the bearing arm are fitted, and a fixed iron core that fits and holds the coil ring;
A rotor rotatably supported in the coil ring;
An electric motor comprising:   2. The electric motor according to claim 1, wherein the coil bobbin is positioned in a circumferential direction by the groove in the fixed iron core, and is positioned in a radial direction by an inner peripheral surface of the fixed iron core.   3. The electric motor according to claim 1, wherein the coil ring and the fixed iron core are integrated by molding with resin.

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