JP2000041348A - Method of improving stator for motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an improving method of a stator for a motor which reduces cogging torque and improves function of the motor. SOLUTION: In a method for innovating radians in a salient tooth side edge of a silicon steel plate of a stator of a motor, a vertex of a salient tooth 21 is made one point of a circular arc, the center of the silicon steel plate is made the center of a circle, and a salient tooth preparation circular arc side 20 is drawn. Right and left ends of the salient tooth 2 are made salient tooth side edge vertexes 22, each of the vertexes 22 is made one point on a circular arc, and each preparation circle 24 of the salient pole side edge is drawn to be in contact with the circular arc side 20. In the preparation circle 24 of the salient tooth side edge 21, required radian of the salient tooth side edge 21 is formed by a circular arc between the salient tooth side edge vertexes 22 and the contact point of the salient tooth preparation circular arc side 20. The above characterizes this improving method of the stator of a motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of improving a motor stator, and more particularly to a method of improving the shape of a silicon steel plate of a motor stator by modifying radians on both sides of a pole face of a convex tooth. The present invention relates to a method for effectively reducing the tooth space effect and reducing the cogging torque and vibration phenomenon of the motor.

[0002]

2. Description of the Related Art In general, the shapes of silicon steel plates of motor stators currently on the market are almost similar in various groove number ratios (ratio of the number of grooves to the number of poles), and the shapes of the silicon steel plates of the 9-groove stator are generally similar. The technology of a silicon steel plate for a conventional stator of a motor will be described below by taking the structure as an example.

FIG. 1 is a plan view showing a structure of a silicon steel plate of a conventional motor stator. As shown in the figure, the shape of the silicon steel plate of the stator of the motor does not have any modification on both sides (convex side 11) of the pole face of the convex tooth 1, so that when the rotor rotates, A tooth groove effect is generated between the different convex teeth, and the motor generates torque unevenness due to the tooth groove effect. The occurrence of the torque unevenness causes the motor to generate uneven rotation, thereby causing a vibration phenomenon when the motor rotates. There was fear. Furthermore, when the motor is operated in a high frequency environment, the above-mentioned phenomenon of uneven torque and vibration becomes severe, and the stability of the motor is greatly reduced.

[0004] Most of the conventional solutions to the above-mentioned drawback of the tooth space effect are based on the magnetizing method. The technology to improve torque unevenness by this method of magnetizing is to form the magnetic flux density on the surface of the magnet into a sinusoidal form by magnetizing, thereby generating smooth lines of magnetic force and reducing the occurrence of tooth space effect. there were.

[0005] However, in the direct charging method, the tooth space effect cannot be reduced to a state where it hardly occurs. In addition, in the charging step during the actual charging operation, the operation of the charging is difficult to control, and even if it is slight. If different, extremely large torque unevenness was generated, and the tooth space effect was further deteriorated. Therefore, there has been a demand for an improvement in a method of reducing the tooth space effect by a method of magnetization.

[0006]

SUMMARY OF THE INVENTION The present invention relates to the shape of a silicon steel plate of a stator of a motor, and particularly to the shape of a side surface of a pole face of a convex tooth of a stator. It is an object of the present invention to provide a method for determining, and determine the shape of the side of the pole face of the entire convex tooth by the method, so that the tooth space effect can be reduced.

That is, the present invention provides the effect of eliminating the occurrence of torque unevenness during the operation of the motor, effectively overcoming the occurrence of the tooth space effect, and further stabilizing the operation of the motor smoothly. It is an object of the present invention to provide a method for modifying the shape of a silicon steel plate of a kind of stator of a motor.

Another object of the present invention is to provide a kind of a silicon steel plate of a stator of a motor which can reduce a vibration phenomenon generated during the operation of the motor and further stabilize the operation of the motor.

[0009]

The invention of claim 1 is a method of modifying the radian of the side of the convex teeth of a silicon steel plate of a motor stator, wherein the vertex of the convex teeth 21 is one point on the circumference and the silicon Convex tooth preformed arc side 20 is drawn with the center of the steel plate as the center of the circle, the left and right ends of convex tooth 2 are set as convex tooth side vertices 22, and each convex tooth side vertex 22 is a point on the circumference. The preliminary circle 24 on the side is drawn so as to be in contact with the convex arc side 20 on the convex tooth, and the convex circle 24 on the convex tooth side and the convex circular arc side 20 on the convex tooth on the preliminary circle 24 on the convex tooth side. An improved method of improving the stator of a motor, characterized in that a required radian of the convex tooth side 21 is formed by an arc between the contact and the contact point.

According to a second aspect of the present invention, by the method for improving a motor stator according to the first aspect, an interval range of one modification variable R can be obtained, and the modification variables include a maximum modification variable Rmax and a minimum modification variable Rmin. Characterized in that any of the modification variables in this modification variable section range can be used to determine the radian of the convex side 21 and the motor operating characteristics.
According to a first aspect of the present invention, there is provided a method of improving a motor stator.

According to a third aspect of the present invention, there is provided the motor stator improvement method according to the first aspect, wherein the ratio of the number of grooves to the number of poles of the motor is 3: 4.

[0012] The invention of claim 4 is a method for determining the minimum modification variable Rmin
Is the radian of the side 21 of the convex teeth,
According to a second aspect of the present invention, there is provided a method for improving a motor stator.

The invention according to claim 5 is characterized in that a preset circle 24 on the side of the convex tooth is provided.
5. The method according to claim 4, wherein the minimum modification variable Rmin is set to the radian of the side surface 21 of the convex tooth in a situation where is minimum.

[0014]

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of modifying the shape of a silicon steel plate of a motor stator, and more particularly, to determining the size of radians on both sides of a pole face of a convex tooth by a method of modifying different arc angles. In addition, the present invention relates to a method for reducing the tooth space effect by forming the entire shape of the convex teeth of the stator of the motor and reducing the vibration phenomenon during motor operation.

FIG. 2 is a plan view showing the shape of a silicon steel plate of the stator of the motor according to the first embodiment of the present invention. In this embodiment, a silicon steel plate of a stator of a motor having nine grooves will be described below as an example. That is, the stator silicon steel plate is 9
Each convex tooth 2 is provided, and both sides (convex side 21) of the pole face of each convex tooth 2 are arc-shaped sides, in which α ° indicates an included angle of each convex tooth. , A indicate the axial length, and the axial length a indicates the distance from the upper end of the convex tooth 2 to the center point of the circle of the silicon steel plate of the stator of the motor. In addition, what is indicated by b indicates the length of the protruding portion of the convex tooth 2, and in FIG.
Indicates the length of the convex teeth.

The formation of radians on the side 21 of the convex teeth in FIG. 2 is the point of the present invention. That is, the present invention provides a method for determining the radian of the convex tooth side 21, and forms the convex tooth side 21 of different radians by the method, and determines which radian is the best situation. Hereinafter, a method of repairing the radian of the side surface 21 of the convex teeth according to the present invention will be described with reference to FIG.
This will be described in detail with reference to FIG.

FIG. 3 shows a method of modifying the radian of the convex tooth side 21 in the present invention. The rotor preliminary arc 10 is drawn therein. In addition, the rotor preliminary arc 10
The concentric circles are the convex tooth preformed circular arc sides 20. The convex tooth preformed arc side 20 determines the top end of the convex tooth 2, and the radian of the convex tooth side 21 of the convex tooth 2 is determined by the method of the present invention.

In addition, both left and right ends of the convex tooth 2 are formed as convex vertex side vertices 22. According to the method for determining the radian of the convex tooth side 21 of the present invention, first, one convex circle is drawn with the convex tooth side vertex 22 as one point on one circumference, and the circle is prepared as the convex tooth side. The circle 24 and the preliminary circle 24 on the side of the convex tooth are drawn so as to be in contact with the convex tooth preliminary arc side 20 mutually. The size of the provisional circle 24 on the side of the convex tooth can be determined by the relationship in contact with each other, and the vertex 22 of the convex tooth side and the convex arc side 20 of the convex tooth on the preliminary circle 24 on the side of the convex tooth. Are formed between the contact points (1) and (2). Thus, the radian of the arc formed by the size of the preliminary circle 24 on the side of the convex teeth is the radian of the side 21 of the convex teeth. This relationship is represented by the formula shown in the following Equation 1.

(Equation 1) In the above formula, R indicates a modification variable, Rmin indicates a minimum modification variable, and Rmax indicates a maximum modification variable. From the above formula, it can be seen that the modification parameter R and the convex tooth included angle α, and the axial length a and the convex tooth length b are in direct proportion, that is, the convex tooth included angle α, the axial length a and the convex R according to the reference value of the tooth length b
Can be determined.

In addition, the minimum modification variable Rmin has another significance, that is, it represents the radian of the convex tooth side 21 formed by the minimum circle when the preliminary circle 24 on the convex tooth side is drawn. . In addition, the maximum modification variable Rmax indicates that the preset circle 24 on the side of the convex tooth is in the maximum situation. Therefore, if the radian of the modification angle satisfies the modification variable R, then
The generation of cogging torque can be effectively prevented. In this regard, the present inventor has determined by experiment that different convex tooth side 2
FIG. 5 shows the result of comparison of the cogging torque at which one radian occurs.

FIG. 5 is a diagram showing the relationship between the radians having different side surfaces of the convex teeth formed according to the embodiment of the present invention and the generated cogging torque. In the figure, Tc indicates cogging torque. FIG.
In the middle, a plurality of samples were taken between the minimum modification variable Rmin and the maximum modification variable Rmax for comparison. In FIG. 5, the cogging torques at four different radians having different convex tooth sides 21 are provided for comparison. According to the results shown in FIG. 5, under different radian conditions, the cogging torque Tc generated by the motor was almost equal, and did not change much. That is, if the radian repair of the convex tooth side 21 is performed so as to satisfy the above formula, in any case, the cogging torque is effectively reduced, the tooth space effect is reduced, and the operation of the motor is smooth and smooth. Proven that it can be.

Based on the conditions set forth in the above formula, the present invention provides a second embodiment of the shape of the silicon steel plate of the stator of the motor. FIG. 4 is a plan view of a silicon steel plate of the stator of the motor according to the second embodiment of the present invention. As in the previous example,
In the second embodiment as well, a silicon steel plate having nine grooves will be described as an example. The radian of the convex tooth side 31 of the nine convex teeth 3 is formed by modifying the arc forming method shown in FIG. 3, and the modification variable R satisfies the condition of the formula shown in Expression 1; In the second embodiment, the preliminary circle 24 on the side of the convex teeth is manufactured in the situation of the maximum circumference, and therefore, the second embodiment of the present invention can also effectively solve the disadvantages of the prior art.

However, when the first embodiment and the second embodiment were compared in the function of motor operation, that is, the output torque of the motor under the same operating current was compared, the result of FIG. 6 was obtained. FIG. 6 is a diagram showing the relationship between different radian modification conditions and the output torque of the motor in the embodiment of the present invention. Among them,
Tout indicates the output torque, and a plurality of samples were extracted between the minimum modification variable Rmin and the maximum modification variable Rmax for comparison. As shown in FIG. 6, the smaller the modification variable R (ie, the closer to the minimum modification variable Rmin), the larger the output torque Tout, that is, the convex torque side 31 of the stator manufactured with the minimum modification variable Rmin. The motor is functionally superior to that of the maximum modifier variable Rmax. Therefore, both the minimum modification variable Rmin and the maximum modification variable Rmax can suppress the occurrence of cogging torque. However, when the output torque of the motor is compared, the minimum modification variable Rmin is larger than the maximum modification variable Rmax.
More specifically, the second embodiment of the present invention is inferior to the first embodiment, and the first embodiment can be said to be a better embodiment.

By comparing FIG. 5 and FIG. 6, in the motor design, the best modifier variable R that can suppress the occurrence of cogging torque and increase the output torque is determined by the formula shown in the following equation (2). It is understood that it is possible.

(Equation 2)

On the other hand, with respect to the convex tooth included angle α, in the embodiment of the present invention, a different range of the convex tooth included angle α can be selected, whereby a good motor output torque Tout can be obtained, and different convex tooth included angles can be obtained. By selecting the range of α, a good motor rotation speed can be generated. As described above, the user can select a convex tooth included angle α within a certain range, thereby making the motor have a large output torque and a high rotational speed.

From the results of FIGS. 5 and 6, a preferred embodiment of the stator of the motor can be obtained, ie
Making one radian the smallest modifier variable R is a desirable choice. This relationship leads to a desirable groove pole ratio of 3: 4 for the motor. With this design, not only can the cogging torque be effectively reduced, but also the tooth space effect can be reduced, and the performance of the motor can be maintained or improved.

[0026]

In summary, the method for improving the motor stator according to the present invention obtains a desired modified radian of the side of the convex tooth based on the modification of the modification parameter of the shape of the silicon steel plate of the motor stator, thereby cogging. It reduces torque, reduces tooth space effect and motor vibration, as well as enhances motor performance, fully achieves the objectives of the present invention, provides a functional advance in its implementation, and is extremely industrial It is clear that it has the utility value of.

[Brief description of the drawings]

FIG. 1 is a plan view showing a shape of a silicon steel plate of a stator of a conventional motor.

FIG. 2 is a plan view showing a shape of a silicon steel plate of a stator of the motor according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a radian modification method of a side of a convex tooth in the first embodiment of the present invention.

FIG. 4 is a plan view showing a shape of a silicon steel plate of a stator of a motor according to a second embodiment of the present invention.

FIG. 5 is a diagram illustrating the relationship between the radians having different convex tooth sides formed according to the embodiment of the present invention and the generated cogging torque.

FIG. 6 is a diagram showing a relation between a radian modification condition and a motor output in the embodiment of the present invention.

[Explanation of symbols]

 1, 2, 3 Convex tooth 11, 21, 31 Convex tooth side 10 Rotor preliminary arc 20 Convex tooth preliminary arc 21 21 Convex tooth side 22 Apex of convex tooth side 24 Preset circle of convex tooth a Axial length b Convex tooth length α ° Convex tooth included angle R Modification variable Rmin Minimum modification variable Rmax Maximum modification variable Tc Cogging torque Tout Output torque

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[Procedure amendment]

[Submission date] September 29, 1999 (1999.9.2)
9)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

Patent application title: Method of improving a motor stator

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor
Motor improvement method, especially the motor stator silicon
Regarding the method of improving the shape of the steel sheet,
Deciding the radian effectively lowers the tooth space effect,
Data on cogging torque and how to reduce vibration phenomena.
You.

[0002]

2. Description of the Related Art Generally, motors currently on the market are
The shape of the silicon steel plate of the stator depends on the number of grooves
(Ratio of pole numbers)
Taking the structure of silicon steel sheet as an example,
The technology of the silicon steel sheet is described below.

FIG . 1 shows a silicon steel for a stator of a conventional motor.
It is a top view which shows the structure of a board. As shown in the figure,
The shape of the silicon steel plate of the motor stator is
Are not modified on either side of the
When the motor rotates, the cogging torque
There was a possibility that the vibration phenomenon at the time of rotation occurred. further
When the motor is operated in a high frequency environment,
The phenomenon of luke unevenness and vibration becomes severe, and motor stability
It has dropped significantly.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a motor
The shape of the silicon steel plate of the
Regarding the shape of the side, the required side of the side of the pole face of the convex tooth
Providing a method for determining the diane, the method comprising:
Decrease the tooth space effect by determining the shape of the side of the tooth's pole face
It is intended to be able to reduce.

[0005] That is, the present invention provides a method for driving a motor during operation.
The appearance of the luke unevenness phenomenon can be eliminated, and the tooth space effect
Effectively overcoming life and further stabilizing motor operation and smoothing
Kind of motor stator that can provide the effect of
To provide a method for determining the shape of silicon steel sheets
The title is.

[0006] Next, the present invention occurs when the motor is operated.
Reduces vibration phenomena and further stabilizes motor operation
Provides a form of silicon steel plate for a kind of motor stator
The challenge is to do.

[0007]

According to the first aspect of the present invention, there is provided a
Modified arc formation method of convex teeth of silicon steel plate of stator
There is a point on the circumference where the peak of the convex tooth is
Draw a center arc with the center of the circle as the center of the circle, right and left of the bottom of the convex tooth
The outer end point of the
Draw a modified arc virtual circle to
The circle between the outer end point of the base of the convex tooth and the contact point with the center arc
The motor is characterized in that it is modified into an arc with an arc.
This is a method for improving the stator. The invention of claim 2 is
The method for improving a motor stator according to claim 1, wherein
Is represented by a qualifying variable R, and the qualifying variable R
Is the range of the minimum modifier variable Rmin and the maximum modifier variable Rmax.
The motor of claim 1, wherein
This is a method for improving the stator. The invention of claim 3 is
The small modifier variable Rmin is taken as the radian of the modified arc
The motor stator according to claim 2, wherein the motor stator is modified.
A good method. The invention according to claim 4 is a modified arc virtual circle
Is the smallest modified variable Rmin in the situation where
5. The radian of claim 4, wherein
This is a method for improving the motor stator.

[0008]

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stator for a motor.
Regarding the method of determining the shape of the raw steel sheet,
Radius on both sides of the pole face of the convex tooth
Determine the size of the ann
Reduces tooth space effect by forming shape, vibration during motor operation
A method for reducing the phenomenon.

FIG . 2 shows a motor switch according to the first embodiment of the present invention.
It is a top view which shows the shape of the silicon steel plate of the data. The implementation
In the example, a silicon steel plate for the stator of a motor with 9 grooves is used.
This will be described below. That is, the stator silicon steel plate is 9
And one convex tooth 2 is provided.
An arc 21) is an arc-shaped side, in which α ° is
Indicates the included angle of the convex teeth, a indicates the axial length, and the axial length
A is the silicon steel plate of the motor stator from the upper end of the convex teeth 2
Indicates the distance to the center of the circle. Also indicated by b
Indicates the distance between the top and bottom sides of the protruding part of the convex teeth 2
In FIG. 2, b indicates the width of the convex teeth.

Determination of the radian of the modified arc 21 in FIG .
Is the point of the present invention. That is, in the present invention, the modified arc
21. A method for determining 21 radians, and comprising:
A modified arc 21 of different radians is formed,
Determine if Ann is in the best situation. Hereinafter, the present invention
FIG. 3 shows a method for determining the radian of the modified arc 21 by using FIG.
This will be described in detail with reference to FIG.

FIG . 3 shows the radian of the modified arc 21 in the present invention.
It is the intention of the decision method. In it, the rotor virtual arc
10 is drawn. In addition, the rotor virtual arc 10
The center arc 20 is concentric. The central arc
20 determines the top end of the convex tooth 2, and
Radians are determined by the method of the present invention.

In addition, the left and right ends of the bottom side of the convex teeth 2 are convex teeth.
Is the outer end point 22 on the bottom side of. The modified arc 21 of the present invention
According to the radian determination method, first, the outer end of the base of the convex tooth
Draw a circle with point 22 as one point on one circumference
The modified circle is assumed to be a modified arc virtual circle 24, and the modified circle
Draw the arc virtual circle 24 so as to be in contact with the central arc 20
Good. Due to this mutual contact relationship, the corrected arc virtual circle 24
Can be determined, and the corrected arc virtual circle 24 can be determined.
And the contact point between the outer end point 22 of the base of the convex tooth and the central arc 20
A correction arc 21 is formed between them. According to the modified arc virtual circle 24
The radian of the arc formed by the
Jian. This relationship is expressed by the following formula 1
It is expressed by an equation.

(Equation 1) In the above formula, R indicates a modification variable, and R is a minimum modification variable R
min and the maximum modifier variable Rmax. Above number
From the equation, the modification variable R, the included angle α of the convex tooth, the axial length a and the convex
It can be seen that the tooth length b is directly proportional, ie,
The reference values for the included angle α of the convex teeth, the axial length a and the convex tooth length b
Thus, the range of R is determined.

In addition, the minimum qualifying variable Rmin is
There is one significance, that is, when drawing the modified arc virtual circle 24
Represents the radian of the modified arc 21 formed by the smallest circle
I do. In addition, the maximum modifier variable Rmax is a modified arc virtual
Circle 24 indicates that it is in the maximum situation. Hence the modified corner
Radians satisfy the range of the modifier variable R
This can effectively prevent the occurrence of cogging torque. This point
About the modified circle, the present inventor
The ratio of cogging torque generated by radian of arc 21
The result of the comparison is shown in FIG.

FIG . 5 shows a repair formed by an embodiment of the present invention.
The relationship between the radians of different circular arcs and the cogging torque generated
FIG. In the figure, Tc indicates cogging torque. FIG.
Medium, between the minimum modifier variable Rmin and the maximum modifier variable Rmax
Were used for comparison. Figure 5 shows the correction
Cogging torque in four different radians of arc 21
Are provided for comparison. According to the result of FIG.
Under different radian conditions,
Ging torques Tc are almost equal and there is not much change
Was. That is, the radius of the modified arc 21 is set so as to satisfy Equation 1 above.
In any case, if you decide to un
Reduce the motor running by reducing the toothing effect by reducing the ging torque.
It was proved that the rolling could be done smoothly and calmly
Was.

Based on the condition shown in the above equation 1, the present invention
The second implementation of the shape of the silicon steel plate of the motor stator
Provide an example. FIG. 4 shows a motor of the second embodiment of the present invention.
It is a top view of the silicon steel plate of theta. Same as the previous embodiment
Similarly, in the second embodiment, the silicon having nine grooves is also used.
A description will be given using a steel plate as an example. Modified arc 3 of 9 convex teeth 3
1 radian modifies the arc formation scheme shown in FIG.
And the modifier R is within the range of Equation 1.
You. Further, in the second embodiment, the modified arc virtual circle 24 is
Manufactured in a large circumference situation, and therefore also a second embodiment of the invention
The disadvantages of the prior art can be effectively solved.

However, in the first and second embodiments, the motor
Comparison in the function of operation, ie under the same operating current
When the output torque of the motor was compared, the result of FIG. 6 was obtained.
Was done. FIG. 6 shows different radian repairs according to an embodiment of the present invention.
FIG. 4 is a diagram illustrating a relationship between decoration conditions and an output torque of a motor. Among them,
Tout indicates the output torque, and the minimum qualifying variable Rmin and
Reference for comparing multiple samples between the maximal modifier variables Rmax
It was extracted in consideration. As shown in FIG.
(Ie, the closer to the minimum modifier variable Rmin,
), The output torque Tout increases, that is, the minimum modification
The modified arc 31 of the stator manufactured with the variable Rmin
Equipped motors are better than those with the largest modifier variable Rmax
Excellent in function. Therefore, the minimum modifier variable Rmin and
Each of the maximum modifier variables Rmax generates cogging torque.
The output torque of the motor can be compared
Then, the minimum qualifying variable Rmin becomes the maximum qualifying variable Rmax
Better, that is, the second embodiment of the present invention is the first embodiment.
Example 1 is inferior to Example 1 and Example 1 is better.
I can.

By comparing FIG. 5 and FIG.
The cogging torque can be suppressed
The best modifier R that can increase the output torque is
It can be seen that it is obtained by the following equation (2).

(Equation 2)

On the other hand, regarding the included angle α of the convex teeth, the present invention
In the embodiment, it is possible to select different ranges of the included angle α of the convex teeth.
It is possible to obtain a better motor output torque Tout.
And select a different range of the included angle α of the convex teeth.
A good motor rotation speed can be generated. This
The user must select the included angle α of the convex tooth within a certain range.
Motor with large output torque and rotational speed
Can be made.

From the results shown in FIGS. 5 and 6, the motor stator
Of the modified arc 2
It is desirable to make one radian the smallest modifier variable R.
Is an alternative. This relationship effectively reduces cogging torque.
To maintain or improve motor performance
Can be

[0020]

In summary, the stator of the motor of the present invention
The improvement method of the
Radians of the desired modified arc based on the modification of the modifier variables
And thereby reduce cogging torque,
To reduce vibration and improve motor performance.
Has achieved the object of the present invention,
It offers a high level of inventiveness and has extremely industrial value.
It is clear that.

[Brief description of the drawings]

FIG. 1 shows the shape of a silicon steel plate of a conventional motor stator.
FIG.

FIG. 2 is a perspective view of a motor stator according to a first embodiment of the present invention;
It is a top view which shows the shape of an element steel plate.

FIG. 3 is a radian determination of a modified arc in the first embodiment of the present invention;
FIG.

FIG. 4 is a perspective view of a stator of a motor according to a second embodiment of the present invention;
It is a top view which shows the shape of an element steel plate.

FIG. 5 shows the difference between a modified arc formed according to an embodiment of the present invention.
FIG.
You.

FIG. 6 shows radian modification conditions and modes in an embodiment of the present invention.
FIG. 6 is a relation diagram of data output.

[Explanation of symbols] 1, 2, 3 convex teeth 11, 31 Corrected arc 10 Rotor virtual arc 20 center arc 21 Corrected arc 22 Outer end point of convex tooth base 24 Modified arc virtual circle a Length in the axial direction b Length of convex teeth α ° Convex tooth included angle R modifier variables Rmin minimum modifier variable Rmax maximum modifier variable Tc cogging torque Tout output torque

Claims (5)

[Claims] 1. A method of modifying a radian of a side of a convex tooth of a silicon steel plate of a stator of a motor, wherein a vertex of the convex tooth 21 is a point on a circumference and a center of the silicon steel plate is a center of the circle. An arcuate side 20 is drawn, the left and right ends of the convex tooth 2 are set as convex tooth side vertices 22, and the convex circle 24 of the convex tooth side where each convex tooth side vertex 22 is a point on the circumference is defined as the convex tooth. The convex tooth is drawn so as to be in contact with the preliminary arc side 20, and the convex tooth is formed by an arc between the convex tooth side vertex 22 and the contact point between the convex tooth preliminary arc side 20 in the convex circle 24 on the convex tooth side. A method for improving the stator of a motor, characterized in that a required radian of the side 21 is formed. 2. The method for improving a stator of a motor according to claim 1, wherein a section range of one modification variable R can be obtained, wherein the modification variables are a maximum modification variable Rmax and a minimum modification variable Rmin.
2. The motor stator according to claim 1, wherein any of the modification variables within the modification variable section range can be used to determine the radian of the convex tooth side 21 and the motor operating characteristics. 3. How to improve. 3. The method according to claim 1, wherein the ratio between the number of grooves and the number of poles of the motor is 3: 4. 4. A method according to claim 2, wherein the minimum modification variable Rmin is the radian of the side 21 of the convex tooth. 5. The motor stator according to claim 4, wherein the minimum modification variable Rmin is set to the radian of the convex side 21 when the preliminary circle 24 on the convex side is minimum. Improvement method.