JP2000350391A - Manufacturing method of motor and motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the flux flow of an outer core without increasing the outer diameter of a motor core, and to achieve miniaturization and to generate large torque by forming a projection part in a place where the outer core is brought into contact with an inner one, by forming a recessed part in a place where the inner core is brought into contact with the outer one, and by fitting the projection part to the recessed part for forming a motor core. SOLUTION: When an outer core 2 and an inner core 3 are punched from magnetic steel sheet (silicon steel sheet) 9, a projection part 4b is formed at a site corresponding to a place being brought into contact with the tip of teeth 5 of the inner core 3 of the outer core 2 when the punched outer and inner cores 2 and 3 are assembled. Then, at the tip of the teeth 5 of the inner core 3 in contact with the projection part 4b of the outer core 2, a recessed part 6 that is engaged to the projection part 4b is formed. Then, a coil 8 is wound to the teeth 5 of the inner core 3, and the projection part 4b of the outer core 2 is fitted to the recessed part 6 of the inner core for forming a motor core 1a, thus generating large torque regardless of a compact size without reducing flux flowing in the circumference direction of the outer core even when the external diameter of the outer core is not increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a motor (electric motor) that generates mechanical power by receiving electric power and a motor.

[0002]

2. Description of the Related Art Brushless DC motors and DC motors
In order to facilitate the winding work of winding the coil around the motor core and to improve the space factor of the coil, when punching a silicon steel plate, the outer core and the inner core are divided and formed, and the inner core teeth are formed. Some adopt a split core system in which both are connected after winding the coil.

[0003] Manufacturing of such a split core will be described with reference to FIG. 8, reference numeral 100 denotes a motor core, reference numeral 20 denotes an outer core, and reference numeral 30 denotes an inner core in which teeth 50 for winding the coil 80 are formed radially. The inner core 30 has a hole 70 into which a rotor core (not shown) is rotatably fitted.

The inner core 30 has a convex portion 304 formed at the tip of the teeth 50 for fixing and positioning in the rotation direction with respect to the outer core 20. The convex portion 304 is formed on the inner periphery of the outer core 20. A concave portion 206b is formed which also serves as positioning for fitting the inner core 30 and the outer core 20 to be fitted. Here, the inner core 30 and the outer core 20 are obtained by punching out one and the same silicon steel plate, but when punching out the convex portion 304 at the tip of the tooth 50 of the inner core 30, the concave portion 206a is formed in the outer core 20. Are molded simultaneously. The concave portion 206a punched at the same time as the convex portion 304 is formed such that the convex portion 304 becomes larger toward the outside by the clearance between the die and the punch. Therefore, the teeth 50 of the inner core 30 are inserted into the concave portion 206a having a smaller diameter by the clearance. The inner core 30 and the outer core 20 cannot be fitted together even if the protruding portion 304 at the tip of the inner core 30 is fitted.

Therefore, only the concave portions 206a and the concave portions 206b at the portions where the convex portions 304 at the tip of the inner core 30 are simultaneously punched are alternately punched on the circumference.
The protrusion 304 at the tip end of the tooth 50
At the same time as 4, it is shifted in the rotational direction from the concave portion 206 a of the punched portion so as to fit into the positioning concave portion 206 b punched larger than the outer shape of the convex portion 304.

[0006]

In the above structure, the magnetic flux flowing in the circumferential direction of the outer core 20 is reduced when it passes through the narrow width a of the outer core 20 in the concave portion 206a, and the torque of the motor is reduced. Decrease. Therefore, in order to allow a large amount of magnetic flux to flow, the size of the outer core 20 must be increased, and there is a problem that the outer diameter of the motor core 100 increases and the size of the motor increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of manufacturing a motor and a motor capable of generating a large and small torque by increasing the flux of the outer core without increasing the outer diameter of the motor core. is there.

[0008]

According to the present invention, there is provided a method of manufacturing a motor, comprising the steps of: punching out an electromagnetic steel sheet to form inner and outer cores; and laminating the inner and outer cores to form a motor core. Therefore, when punching the outer core and the inner core from the electromagnetic steel sheet, when assembling the punched outer core and the inner core, a convex portion is formed at a portion corresponding to a portion of the outer core that contacts the inner core. A punching step of forming a concave portion at a portion corresponding to a portion of the inner core that contacts the outer core, a step of winding a coil around the teeth of the inner core, a convex portion of the outer core, and a concave portion of the inner core. And forming a motor core by fitting them together.

A motor according to the present invention for achieving the above object is a motor which forms an inner and outer core by punching out an electromagnetic steel plate and laminates the inner and outer cores to form a motor core.
A convex portion is formed at a portion of the outer core corresponding to the portion that contacts the inner core, and a concave portion is formed at a portion corresponding to the portion of the inner core that contacts the outer core, and the convex portion of the outer core is It is characterized in that the concave portion of the core is fitted.

An inner and outer core is formed by punching out an electromagnetic steel sheet, and the inner and outer cores are laminated to form a motor core. Wherein a concave portion is formed at a portion corresponding to a portion of the inner core that comes into contact with the outer core, and the angled convex portion of the outer core and the angled concave portion of the inner core are fitted. It is.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1a denotes a motor core of the motor according to the first embodiment. As shown in FIG. 2, the method of manufacturing a motor using the motor core 1a is as follows.
When the outer core 2 (see FIG. 3) and the inner core 3 are punched from (silicon steel sheet), when the punched outer core 3 and the inner core 3 are assembled, the tip of the teeth 5 of the inner core 3 of the outer core 2 A convex portion 4b is formed at a portion corresponding to the contact portion, and a concave portion 6 that fits with the convex portion 4b is formed at the tip of the tooth 5 of the inner core 3 that contacts the convex portion 4b of the outer core 2. A step of winding a coil 8 (see FIG. 1) around the teeth 5 of the inner core 3, and a step of fitting the projection 4 b of the outer core 2 and the recess 6 of the inner core to fit the motor core. This is equivalent to the step of forming 1a.

Here, the outer core 2 has a convex portion 4a punched out simultaneously with the concave portion 6 at the tip of the tooth 5 of the inner core 3, and a convex portion 4b punched out simultaneously with a scrap 4c which is an unnecessary portion. Formed alternately on top. This is inner core 3
One of the protrusions 4a punched at the same time as the recess 6 at the tip of the tooth 5 of the inner core 3 has a larger punch and die than the protrusion 4b punched at the same time as the scrap 4c not punched at the same time as the recess 6 at the tip of the tooth 5 of the inner core 3. Since the clearance is reduced inward by the clearance and is not suitable for fitting the concave portion 6 at the tip of the tooth 5 of the inner core 3, the tooth 5 of the inner core 3 is not suitable.
The other convex portion 4b that also serves as a positioning is formed with a gap that can be fitted to the concave portion 6 at the tip of the other. The inner core 3 has a hole 7 into which a rotor core (not shown) is rotatably fitted.

In the outer core 2 and the inner core 3 obtained by the above-described manufacturing method, the coil 8 is wound around the teeth 5 of the inner core 3, and the projections 4b of the outer core 2 and the recesses 6 of the inner core are fitted. By assembling them together, the motor of the first embodiment using the motor core 1a shown in FIG. 1 and FIG. 5 which is a side view of FIG. 1 is obtained.

In FIG. 4, reference numeral 1b denotes a motor core of the motor according to the second embodiment. The motor core 1b of the motor according to the second embodiment has a structure in which one convex portion 4a punched out simultaneously with the concave portion 6 at the tip of the tooth 5 of the inner core 3 in the motor core 1a of the motor according to the first embodiment is removed. The method of manufacturing the motor according to the second embodiment is the same as the process of the method of manufacturing the motor according to the first embodiment. As shown in FIG. One of the protrusions 4a is cut and removed. A coil 8 is wound around the teeth 5 of the inner core 3 in the same manner as in the motor manufacturing method according to the first embodiment, and the protrusions 4b of the outer core 2 and the inner core 3 are removed. By assembling the tooth 5 with the concave portion 6 at the tip end of the tooth 5, the motor of the second embodiment using the motor core 1b shown in FIG. 4 is obtained. The inner core 3 has a hole 7 into which a rotor core (not shown) is rotatably fitted.

In FIG. 7, reference numeral 1c denotes a motor core of the motor according to the third embodiment. The motor core 1c of the motor according to the third embodiment has a mountain-shaped convex portion 40 at a position corresponding to a position where the outer core 2 and the inner core 3 are in contact with the tips of the teeth 5 of the inner core 3 of the outer core 2. Is formed at the tip of the tooth 5 of the inner core 3 which comes into contact with the angled convex portion 40 of the outer core 2.
Was formed. The motor according to the third embodiment is the same as that of the method of manufacturing the motor according to the first embodiment. The coil 8 is wound around the teeth 5 of the inner core 3, and the angled convex portion 40 of the outer core 2 and the inner The motor core 1c shown in FIG.
Thus, the motor according to the third embodiment is obtained. The inner core 3 has a hole 7 into which a rotor core (not shown) is rotatably fitted.

According to the manufacturing method of the present invention, the convex portion 4b is formed in the portion corresponding to the portion of the outer core 2 which comes into contact with the inner core 3, and the angled convex portion 40 is formed in the third embodiment. In the first and second embodiments, the recess 6 and the inverted mountain-shaped recess 60 in the third embodiment are formed in portions of the inner core 3 corresponding to the portions that come into contact with the outer core 2. Convex part 4
b, the motor cores 1a, 1b, 1c so that the angled convex portions 40 and the concave portions 6 and the concave portions 60 of the inner core 3 are fitted respectively.
Is manufactured, the material yield of the electromagnetic steel sheet 9 is improved, and a small-sized and large-torque motor having the configuration of the motor cores 1a, 1b, 1c can be manufactured.

That is, in any of the motors of the first to third embodiments using the motor cores 1a, 1b, and 1c, the outer core 2 has the convex portion 4b and the chevron-shaped convex portion 40, so that it comes into contact with the inner core 3. The radial width of the portion can be increased, and the magnetic flux flowing in the circumferential direction of the outer core 2 is not restricted, so that a large torque can be generated without increasing the outer diameter of the outer core 2.

In the motor of the first embodiment using the motor core 1a, one of the protrusions 4a punched simultaneously with the recess 6 of the inner core 3 is fitted with the recess 6 of the inner core 3 and the positioning protrusion 4b for positioning the outer core 2. Although it becomes unnecessary after this, the one unnecessary projection 4a is arranged so as to fit in the dead space between the coils 8, so that the one projection 4a which becomes unnecessary in the manufacturing process is used. The trouble of cutting and removing is eliminated.

In the motor of the second embodiment using the motor core 1b, it is necessary to cut and remove one of the projections 4a which becomes unnecessary after assembly in the manufacturing process. However, this one projection 4a is cut and removed. As a result, one of the protrusions 4a that obstructs the space for accommodating the coil 8 is eliminated, so that the space for accommodating the coil 8 is widened, and the coil 8 having a large winding can be accommodated. The motor core 1b can be reduced in weight by the amount removed.

In the motor of the third embodiment using the motor core 1c, the angled convex portion 40 and the inverted angled concave portion 60 are merely stamped and formed. Since it is not a mold cutting blade but a mold cutting blade with a gentle inclination of two surfaces, it is easy to manufacture a mold and a punch can be smoothly obtained.

In the first and second embodiments, the motor cores 1a, 1
The convex portion 4a and the concave portion 4b of FIG. 3B have a trapezoidal shape that eliminates a gap by the effect of a wedge, and the motor core 1c of the third embodiment has a triangular shape of a convex portion 40 and a concave portion 60 having an inverted mountain shape. Arc-shaped convex portions and concave portions may be used. Further, the present invention can be applied not only to a brushless DC motor but also to an AC motor and an alternator.

[0022]

As described above, according to the present invention, even if the outer diameter of the outer core is not increased, the magnetic flux flowing in the circumferential direction of the outer core is not reduced, so that the motor can be reduced in size and generate a large torque. Can be provided.

[Brief description of the drawings]

FIG. 1 is a front view of a motor core of a motor according to a first embodiment of the present invention.

FIG. 2 is a diagram showing the stamping manufacturing of the motor core of the motor according to the first embodiment of the present invention.

FIG. 3 is a diagram showing an outer peripheral punching manufacturing of the outer core of the motor according to the first embodiment of the present invention.

FIG. 4 is a front view of a motor core of a motor according to a second embodiment of the present invention.

FIG. 5 is a side view of FIG. 1;

FIG. 6 is a view showing an outer peripheral punching manufacturing of an outer core of a motor according to a second embodiment of the present invention.

FIG. 7 is a front view of a motor core of a motor according to a third embodiment of the present invention.

FIG. 8 is a front view of a motor core of a conventional motor.

[Explanation of symbols]

 Reference Signs List 1a Motor core (Example 1) 1b Motor core (Example 2) 1c Motor core (Example 3) 2 Outer core 3 Inner core 4a Convex part 4b Convex part 4c Scrap 5 Teeth 6 Concave part 7 Hole 8 Coil 9 Electromagnetic steel sheet 40 Convex part 60 recess

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H002 AA09 AB06 AB07 AC06 AC08 AE07 AE08 5H615 AA01 BB01 BB02 BB04 BB05 BB14 PP07 PP10 PP13 QQ02 SS03 SS05 SS19 TT04

Claims (3)

[Claims] 1. A motor that forms an inner / outer core by punching out an electromagnetic steel sheet, and forms a motor core by laminating the respective inner and outer cores. When the outer core and the inner core are punched out of the electromagnetic steel sheet, When the inner core is assembled, a protrusion is formed at a portion corresponding to a portion of the outer core that contacts the inner core, and a punch is formed to form a recess at a portion corresponding to the portion of the inner core that contacts the outer core. And a step of winding a coil around the teeth of the inner core, and a step of forming a motor core by fitting a convex portion of the outer core and a concave portion of the inner core. Production method. 2. A motor that forms an inner and outer core by punching out an electromagnetic steel sheet, and stacks the inner and outer cores to form a motor core, wherein a convex portion is formed at a portion corresponding to a portion of the outer core that contacts the inner core. A motor, wherein a concave portion is formed in a portion corresponding to a portion of the inner core that contacts the outer core, and a convex portion of the outer core and a concave portion of the inner core are fitted. 3. A motor for forming an inner / outer core by punching out an electromagnetic steel sheet, and laminating each inner / outer core to form a motor core, wherein a mountain-shaped convex portion is provided at a portion corresponding to a portion of the outer core which comes into contact with the inner core. Wherein a concave portion is formed in a portion corresponding to a portion of the inner core that comes into contact with the outer core, and the angled convex portion of the outer core and the angled concave portion of the inner core are fitted to each other. .