JP2001245460A - Permanent magnet motor - Google Patents

Abstract

(57) [Problem] To provide a permanent magnet motor in which the winding coefficient is increased to reduce the amount of copper wire used, the torque is increased, and the efficiency is improved. SOLUTION: An inner rotor 10 using a permanent magnet 11 having 10 poles, and a yoke 2 of a stator core 1 are provided.
A permanent magnet motor comprising a stator having twelve teeth 3 and 4 opposed to and protruding from the rotor 10;
The twelve teeth 3 and 4 are divided into three groups. In each group, the width of the three wide-pitch teeth 3 in which the pitch between the openings is continuous is widened, and the remaining one narrow-pitch tooth 3 is widened. The width of the teeth 4 is narrowed, and the windings 20 are applied to the wide-pitch teeth 3 so that adjacent poles have different polarities.
By applying a single-phase winding 20 to each group by concentrated winding without applying 0, a three-phase winding is applied as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a permanent magnet motor, and more particularly, to a stator core shape and a winding coefficient.

[0002]

2. Description of the Related Art FIGS. 4 (a), 4 (b) and 4 (c) are sectional views showing an example of a stator core and a rotor of a conventional permanent magnet motor, FIG. It is an explanatory view of a winding coefficient which shows an example of a conventional permanent magnet motor.

Conventionally, a permanent magnet motor has a stator core 1
The teeth 3 are provided at equal intervals from the yoke 2 and slots 5 are formed on both sides of the teeth 3 to insulate except for at least the tips of the teeth 3 facing the rotor 10. 5 and an inner rotor 10 using a permanent magnet 11 with a winding 20 wound therearound. FIG.
(A): rotor 10 has 10 poles, teeth 3 of stator core 1
(B), rotor 10 has 8 poles, stator core 1 has 12 teeth 3, and (c) rotor 10 has 4 poles, stator core 1 has The case where there are six teeth 3 is shown.
Among these, FIG. 4A shows the largest winding coefficient.

[0004] The winding coefficient in this case will be described in detail below. First, the winding coefficient is calculated as the product of the short-coil winding coefficient and the distributed winding coefficient, and is linked to the torque constant of the permanent magnet motor that can evaluate the quality of the torque performance. The short winding factor is 9 when the teeth 3 of the stator core 1 are equally spaced.
Since it is an individual number, it is located at an interval of 40 ° in angle, and is 0.9848 according to the calculation formula of FIG. The average of the distributed winding coefficients is selected as a reference point by combining the center line of the teeth 4 and the center line of the poles of the rotor 10, and for one phase, the center line of the teeth 3 of the stator core 1 and the rotor. When the phase difference from the center line of the pole of the motor 10 is θ1, θ2, θ3, θ1 =
Since 2 °, θ2 = 6 °, and θ3 = 10 °, 0.8312 is obtained from the calculation formula in FIG. The winding coefficient in this case is calculated as the product of the short-coil winding coefficient and the distributed winding coefficient, as shown in FIG. 5, and has the best value of 0.8186.

[0005] However, the value of the winding coefficient = 0.8186 is not always sufficient for a permanent magnet motor,
Further numerical improvements are desirable for increased torque and efficiency. In the stator core 1 having the teeth 3 of the same pitch as in the above-described conventional example, it is difficult to increase the winding coefficient beyond this.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has been made to improve the efficiency by increasing the winding coefficient, reducing the amount of copper wire used, increasing the torque, and improving the efficiency. It aims to provide a permanent magnet motor.

[0007]

In order to achieve the above object, in a permanent magnet electric motor composed of an inner rotor using a permanent magnet having 10 poles and a stator having 12 teeth, The teeth of the stator are divided into three groups, and in each of the groups, the width of three consecutive teeth in which the pitch between the openings of the teeth is wide, and the width of the other tooth is narrow. Then, by applying a winding to the teeth of the wide pitch so that the neighbors have different polarities, and not applying a winding to the teeth of the narrow pitch, by applying a winding of one phase to each of the groups, A three-phase winding is applied as a whole.

Then, the pitch between the openings of the wide-pitch teeth is set within a range of 36 ° ± 4 °.

In addition, the teeth are insulated and concentrated winding is applied.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail based on embodiments with reference to the accompanying drawings. FIG. 1 (a)
FIG. 2 is a sectional view showing an embodiment of a stator core and a rotor of the permanent magnet motor according to the present invention, FIG. 2 (b) is an explanatory view of windings, and FIG. FIG. 3 is an explanatory diagram showing the best range of the winding coefficient of the permanent magnet motor according to the present invention.

In the drawing, 1 is a stator core, 2 is a yoke portion, 3 is a wide pitch tooth, 4 is a narrow pitch tooth, 5 is a groove, 1
0 indicates a rotor, 11 indicates a permanent magnet, and 20 indicates a winding. Here, the same reference numerals are used for the same parts as in the conventional example.

First, the row of the permanent magnet motor of this embodiment is
To explain the data 10, 10
An inner rotor 10 having the number of poles is provided. The stator of the permanent magnet motor has twelve teeth 3, 4 protruding from the yoke 2 of the stator core 1 so as to face the rotor 10. Except for the tips of the teeth 3 and 4, the stator core 1 is insulated.

Here, the twelve teeth 3, 4 are divided into three groups. In each group, the width of the three wide-pitch teeth 3 in which the pitch between the openings is continuous is widened, and the width of the remaining one narrow-pitch tooth 4 is narrow.
Further, the pitch between the openings of the wide pitch teeth 3 is set to 36
Be within the range of ± 4 °. In addition, the windings 20 are applied to the wide pitch teeth 3 so that adjacent poles have different polarities, and the windings 20 are not applied to the narrow pitch teeth 4. In a concentrated winding, thereby providing a three-phase winding as a whole.

The winding 20 for one phase will be described in more detail. For the three teeth 3 having the wide pitch, the winding 20 is wound leftward from the groove 5 to the next groove 5 on the left tooth 3. , The center tooth 3 is clockwise wound from the groove 5 to the next groove 5,
The right teeth 3 are concentratedly wound leftward from the groove 5 to the next groove 5, respectively. Alternatively, if the winding 20 is wound right from the groove 5 to the next groove 5 on the left tooth 3, the center tooth 3 is wound left from the groove 5 to the next groove 5, and the right tooth 3 from the groove 5 Each of the grooves 5 may be wound right-hand concentratedly into the next groove 5. This is similarly concentrated for all three phases.

Next, the operation and effect of the present invention will be described. First, as shown in FIG. 2, the winding coefficient is calculated as a product of a short-coil winding coefficient and a distributed winding coefficient, and is linked to a torque constant of a permanent magnet motor capable of evaluating whether torque performance is good. Since the stator core 1 has twelve wide-pitch teeth 3 in the stator core 1 and is located at an interval of 37 ° in angle, the short section winding coefficient is 0.999 according to the calculation formula of FIG.

The average of the distributed winding coefficients is selected as a reference point by aligning the center line of the narrow pitch teeth 4 with the center line of the poles of the rotor 10, and the tooth 3 of the stator core 1 for one phase is selected.
Is the phase difference between the center line of the rotor 10 and the center line of the pole of the rotor 10.
When θ1, θ2, and θ3, respectively, θ1 = 5 ° and θ2 = 6
° and θ3 = 7 °, so that 0.
8638. The winding coefficient in this case is shown in FIG.
Is calculated as the product of the short-coil winding coefficient and the distributed winding coefficient, and has a value of 0.863.

Further, as shown in FIG. 3, the formula for calculating the short-coil winding coefficient kp and the distributed winding coefficient kd is derived by generalizing the wide pitch θ of the teeth 3 by an angle, and θ = 32 ° to 40 °. °
, The winding coefficient k (θ) was calculated, and its table and graph were described. As a result, a value exceeding the conventional best value of the winding coefficient k (θ) = 0.8186 can be obtained. Then, as is apparent from FIG.
In order to obtain a value of (θ) exceeding 0.8186, the wide pitch θ can be realized by setting it within a range of 36 ° ± 4 °. As a result, the winding coefficient of the permanent magnet motor can be increased to reduce the amount of copper wire used, increase torque, and improve efficiency.

[0018]

As described above, according to the present invention, the inner rotor using the permanent magnet having ten poles,
In a permanent magnet motor composed of a stator having two teeth, the teeth of the stator are divided into three groups, and in each of the groups, three pitches between the openings of the teeth are continuous. The width of the teeth is widened, and the width of the remaining one tooth is narrowed. The wide pitch teeth are wound so that the neighbors have different polarities, and the narrow pitch teeth are not wound. By applying a single-phase winding to each of the groups, a three-phase winding is applied as a whole. As a result, it is possible to provide a permanent magnet electric motor in which the winding coefficient is increased to reduce the amount of copper wire used, the torque is increased, and the efficiency is improved.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view showing an embodiment of a stator core and a rotor of a permanent magnet motor according to the present invention, and FIG.
FIG. 4 is an explanatory diagram of a winding.

FIG. 2 is an explanatory diagram of a winding coefficient showing one embodiment of a permanent magnet motor according to the present invention.

FIG. 3 is an explanatory diagram showing the best range of the winding coefficient of the permanent magnet motor according to the present invention.

4A, 4B, and 4C are cross-sectional views illustrating an example of a stator core and a rotor of a conventional permanent magnet motor.
(D) is an explanatory view of a winding.

FIG. 5 is an explanatory diagram of winding coefficients showing an example of a conventional permanent magnet motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator core 2 Yoke part 3 Wide pitch teeth 4 Narrow pitch teeth 5 Groove 10 Rotor 11 Permanent magnet 20 Winding

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Koji Kasai 1116 Suenaga, Takatsu-ku, Kawasaki F-term in Fujitsu General Limited (Reference) 5H002 AA05 AB06 AE07 5H621 AA03 GA01 GA04 GA12 GA17 GB03 JK02 JK05 PP10

Claims (3)

[Claims] 1. A permanent magnet motor comprising an inner rotor using permanent magnets having 10 poles and a stator having 12 teeth, wherein said stator teeth are divided into three groups. In each of the groups, the width of three consecutive teeth in which the pitch between the openings of the teeth is widened, and the width of the remaining one tooth is reduced, By applying a winding so that the polarity is different, not applying a winding to the narrow pitch teeth, by applying a winding of one phase to each of the groups,
A permanent magnet electric motor having a three-phase winding as a whole. 2. The pitch between the openings of the wide pitch teeth,
2. The permanent magnet motor according to claim 1, wherein the angle is within a range of 36 ° ± 4 °. 3. The permanent magnet motor according to claim 1, wherein the teeth are insulated and a concentrated winding is applied.