JPH08163799A - Electric motor - Google Patents

Abstract

PURPOSE: To reduce the width of tooth sections, to increase the areas of grooves, to improve flux distribution and to lower noises and vibrations by forming the groove sections inside and outside the generally I-shaped tooth sections of a right form and a left form respectively and winding external windings among the groove sections near to the outer circumferences of base ends and internal windings among the groove sections near to inner circumferences. CONSTITUTION: The tooth sections of generally I-shaped forms 3 are formed at regular intervals from a yoke section 2 along the inner circumference of a stator core 1. The tooth sections, in which the width of the tooth sections is made wider than the generally I-shaped forms 3 and air gaps (a) among a rotor 7 and the tooth sections are made broader than those (b) of the generally I-shaped forms 3, of bilaterally symmetrical right forms and left forms are formed on both sides from every other base end 3a of the tooth sections of the generally I-shaped forms, and groove section 6 are formed inside and outside the tooth sections of the right forms and the left forms repectively. External windings 8 are wound among the groove sections 6 near to the outer circumferences of the base ends 3a, and internal windings 9 are wound among the groove sections 6 near to inner circumferences while holding the generally I-shaped forms 3. Accordingly, the width of the tooth sections is reduced, the areas of the grooves are increased, flux distribution is improved, and noises and vibrations can be lowered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor, and more particularly to a structure of teeth of a stator core.

[0002]

2. Description of the Related Art Conventionally, for example, a stator core of an electric motor having 24 slots and 6 poles has a substantially I-shaped portion 3 extending from a yoke portion 2 along an inner circumference of a stator core 1 as shown in FIGS. Tooth portions are provided at equal intervals, and the air gap b with the rotor 7 is made to be the same as the substantially I-shaped air gap a on both sides of the base portion 3a of every other substantially I-shaped tooth portion. The tooth portions of the inverted substantially L-shaped 5 and the substantially L-shaped 4 are profitable, and the groove portions 6 are formed inside and outside the inverted substantially L-shaped and substantially L-shaped tooth portions, respectively, and the outer periphery of the base end is formed. The outer winding 8 is wound between the groove portions close to each other, and then the inner winding 9 is wound between the groove portions near the inner circumference with a substantially I-shape interposed therebetween to form a stator. In this case, the facing areas of the inverted L-shaped and L-shaped tooth portions are large, while the substantially I-shaped tooth portion is small. For this reason, a large amount of magnetic flux flows through the inverted L-shaped and L-shaped tooth portions, and it is necessary to increase the width of the tooth portions, which also causes the area of the groove portion to be reduced.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to reduce the width of the inverted L-shaped and L-shaped tooth portions and increase the groove area to improve the magnetic flux distribution, noise, It is to provide an electric motor with reduced vibration.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention extends from the yoke portion along the inner circumference of the stator iron core to approximately I.
Air-gap between the rotor and the substantially I-shaped toothed portions are provided at equal intervals, and the width of the toothed portions is wider than the substantially I-shaped toothed portions on both sides of every other base end. Is provided with right and left tooth portions of a left-right symmetrical shape having a width wider than that of the substantially I-shape, and groove portions are formed inside and outside the tooth portions of the right and left die, respectively. It is characterized in that the outer winding is wound between the groove portions near the outer circumference, and then the inner winding is wound between the groove portions near the inner circumference with a substantially I-shape sandwiched therebetween. In addition, the right and left tooth portions are respectively formed into a reverse L-shape and a substantially L-shape, respectively. Alternatively, it is characterized in that the right and left tooth portions have an inverted substantially U-shape and a substantially U-shape, respectively.
The ratio of the air gap between the right mold or the left mold and the substantially I-shape is equal to the ratio of the width of the surface where the right mold or the left mold and the substantially I-shape face the rotor. It is characterized by being done. In addition, each tooth forming the groove is subjected to an insulation treatment, and the outer winding and the inner winding are wound in this order through the slot opening.

[0005]

With the above-described structure, substantially I-shaped tooth portions are provided at equal intervals from the yoke portion along the inner circumference of the stator core, and every other one of the substantially I-shaped tooth portions is provided. On both sides of the base end, right and left tooth portions having a symmetrical shape in which the width of the tooth portion is wider than that of the substantially I-shape and the air gap between the rotor and the rotor is wider than that of the substantially I-shape are provided. Grooves are formed inside and outside the right and left tooth portions, respectively, and an outer winding is wound between the groove portions near the outer circumference of the base end, and then a substantially I-shaped portion is sandwiched between them. Inner windings are wound between the close groove portions, and the right and left tooth portions are respectively formed into inverted L-shaped and L-shaped, respectively, or the right-shaped and left-shaped teeth. The shapes of the parts are respectively inverted substantially U-shape and substantially U-shape, and the ratio of the air gap between the right mold or the left mold and the substantially I-shape is the right mold or the left mold and the air mold. Approximately I-shaped is the rotor Since it is equal to the width ratio of the surfaces facing each other, and each tooth forming the groove is subjected to an insulation treatment, the outer winding and the inner winding are wound in this order through the slot opening. It is possible to improve the magnetic flux distribution by reducing the width of the inverted L-shaped and L-shaped teeth and increasing the groove area.

[0006]

Embodiments of the electric motor according to the present invention will now be described in detail with reference to the drawings. The same parts as those in the conventional example have the same reference numerals. Embodiments of the present invention will be described in detail with reference to the accompanying drawings with respect to a 24-slot 6-pole electric motor. FIG. 1 is a plan view of a stator core of an electric motor according to the present invention.
Along the inner circumference of the stator core 1, tooth portions of a substantially I-shape 3 are provided at equal intervals from the yoke portion 2. The width of the tooth portion is made wider than the substantially I-shaped portion on both sides of the base end 3a of every other tooth portion of the substantially I-shaped portion, and between the rotor portion 7 and the rotor 7 according to the present invention, as shown in FIG. The right and left teeth having a symmetrical shape with the air gap a wider than the substantially I-shaped air gap b are provided. Grooves 6 are formed inside and outside the right and left teeth, respectively. Here, the shapes of the right and left tooth portions are inverted L-shape 5 and L-shape 4, respectively. Next, as shown in FIG. 2, the outer winding 8 is wound between the groove portions near the outer circumference of the base end,
The inner winding 9 is wound between the groove portions near the inner circumference with the substantially I-shape sandwiched therebetween. Alternatively, as shown in FIG. 4, the shapes of the right and left tooth portions may be inverted substantially U-shaped 5a and substantially U-shaped 4a, respectively. The ratio of the air gaps b and a between the right mold or the left mold and the substantially I-shaped mold is determined by the width d of the surface where the right mold or the left mold and the substantially I-shaped mold face the rotor. To be equal to the ratio of c. Further, each tooth forming the groove is subjected to insulation treatment, and the outer winding and the inner winding are wound in this order through the slot opening.

[0007]

As described above, substantially I-shaped tooth portions are provided at equal intervals from the yoke portion along the inner circumference of the stator core.
The left and right sides of the tooth portion of the substantially I-shaped portion having a width of the tooth portion wider than that of the substantially I-shaped portion and an air gap between the rotor and the rotor are wider than those of the substantially I-shaped portion on both sides of the base portion. Symmetrical right shape,
Left-sided tooth portions are provided, grooves are formed inside and outside the right-sided and left-sided tooth portions, respectively, and an outer winding is wound between the groove portions near the outer periphery of the base end, and then a substantially I-shaped portion is formed. Inner windings are wound between the groove portions close to the inner circumference with the mold sandwiched therebetween, and the tooth portions of the right mold and the left mold are formed into inverted L-shapes and L-shapes, respectively, or the right mold The left and right teeth are shaped like inverted U-shape and U-shape, and the ratio of the air gap between the right mold or the left mold and the substantially I-shape is the right mold. Alternatively, the left mold and the substantially I-shape are made equal to the ratio of the widths of the surfaces facing the rotor,
Further, since each tooth forming the groove is subjected to an insulation treatment, and the outer winding and the inner winding are wound in this order through the slot opening, the reverse substantially L-shape and the substantially L-shape are formed. It is possible to provide a motor in which the width of the tooth portion of the mold is reduced and the groove area is increased to improve the magnetic flux distribution and reduce noise and vibration.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a stator core of an electric motor according to the present invention.

FIG. 2 is a plan view showing an embodiment of an electric motor according to the present invention.

FIG. 3 is an enlarged view of a main part of an embodiment of a stator core of an electric motor according to the present invention.

FIG. 4 is an enlarged view of an essential part showing another embodiment of the stator core of the electric motor according to the present invention.

FIG. 5 is a plan view showing a stator core of a conventional electric motor.

FIG. 6 is an enlarged view of a main part of a stator core of a conventional electric motor.

[Explanation of symbols]

 1 Stator core 2 Yoke part 3 Substantially I-shaped 3a Substrate of substantially I-shaped 4 Substantial L-shaped 4a Substantial U-shaped 5 Reverse approximately L-shaped 5a Reverse approximately U-shaped 6 Groove 7 Rotor 8 Outside Winding 9 Inner winding a Air gap of substantially I shape b Right and left air gap c Width of facing surface of substantially I shape d Width of facing surface of right type and left type

Claims (5)

[Claims] 1. A substantially I-shaped tooth portion is provided at equal intervals from a yoke portion along an inner circumference of a stator iron core, and the substantially I-shaped tooth portion is provided on both sides of a base end of the tooth portion. The right mold and the left mold are provided with right and left symmetric tooth parts in which the width of the teeth is wider than that of the substantially I-shape and the air gap between the rotor and the rotor is wider than that of the substantially I-shape. Grooves are formed inside and outside the tooth portion of the left mold, and an outer winding is wound between the groove portions near the outer circumference of the base end, and then an inner winding is wound between the groove portions near the inner circumference with a substantially I-shape sandwiched therebetween. An electric motor characterized by winding a wire. 2. The electric motor according to claim 1, wherein the teeth of the right mold and the teeth of the left mold are reverse L-shaped and L-shaped, respectively. 3. The electric motor according to claim 1, wherein the right and left tooth portions have an inverted substantially U-shape and a substantially U-shape, respectively. 4. The ratio of the air gap between the right mold or the left mold and the substantially I-shaped mold is determined by the width of the surface where the right mold or the left mold and the substantially I-shaped mold face the rotor. The electric motor according to claim 1, wherein the electric motor is equal to the ratio. 5. The toothed portion forming the groove portion is subjected to an insulating treatment, and the outer winding and the inner winding are wound in this order through the slot opening portion. The electric motor according to claim 2, claim 3, and claim 4.