JPH11262226A - Rotor core of bisalient pole reluctance motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the weight of a rotor core of a bisalient pole reluctance motor without deteriorating the performance or increasing the cost, by setting the diameter size at the root of salient poles to the diameter size of a rotary shaft with addition of the minimum necessary width of a magnetic path. SOLUTION: A rotor core has eight salient poles. An inner diameter size D30 of the rotor core corresponds to the diameter size of a rotary shaft, and a diameter size D21 at the root of the salient poles corresponds to the inner diameter dize D30 with the addition of a minimum necessary width W1 of a magnetic path. By forming the magnetic path of the minimum necessary width W1 on the outside of the inner diameter D30 corresponding to the diameter size of the rotary shaft, the magnetic path width W1 serves for a width section for connection with the rotary shaft. With this method, the weight of the rotor core of a bisalient pole reluctance motor can be reduced, without deterioration in the performance or the increase in cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor core of a double salient pole type reluctance motor.

[0002]

2. Description of the Related Art FIG. 3 shows a schematic configuration of a switched reluctance motor which is a kind of a double salient pole type reluctance motor. Switched reluctance motor SRM shown in FIG.
Is a three-phase switched reluctance motor in which the direction of the current flowing through each phase coil is one direction, and eight salient poles Ra, Rb, Rc, Rd, Re, R protruding outward in the radial direction.
f, Rg, and Rh, and twelve salient poles Sa, Sb, Sc, Sd, S protruding radially inward.
e, Sf, Sg, Sh, Si, Sj, Sk, and Sl, and a stator core S having a rotation axis RS that penetrates the center of the rotor core R and is integrated with the rotor core. The stator core S is a core formed by stacking iron plates, and the stator core S is a salient pole Sa, Sb, Sc, Sd, S of an annular core formed by stacking many iron plates.
e, Sf, Sg, Sh, Si, Sj, Sk and Sl,
U-phase coils CLu, W wound concentrated as shown in FIG.
A phase coil CLw and a V-phase coil CLv are provided.

As shown in FIG. 3, salient poles Ra are salient poles Sa, S
b, the salient pole Rc is located between the salient poles Sd and Se, the salient pole Re is located between the salient poles Sg and Sh, and the salient pole Rg is located between the salient poles Sj and Sk. , U-phase coil CLu is energized, salient poles Sa, S of stator core S
d, Sg and Sj are magnetized, and the salient poles Ra,
Rc, Re and Rg are salient poles Sa, Sd, Sg and Sj
And the rotor core R rotates in the direction of the arrow in FIG. The rotor core R is a salient pole R of the rotor core R.
a, Rc, Re and Rg are salient poles Sa, Sd, Sg and S
j and salient pole Rb is between salient poles Sb and Sc, salient pole Rd is between salient poles Se and Sf, and salient pole Rf is salient pole S.
When the salient pole Rh rotates in the direction of the arrow between the h and Si by an angle (15 degrees) at which the salient pole Rh is located between the salient poles Sk and Sl, the energization of the U-phase coil CLu and the W-phase coil C
When switching to the current supply to Lw, the salient poles Sb, Se, Sh, and Sk are magnetized, the salient poles Rb, Rd, Rf, and Rh are attracted to the salient poles Sb, Se, Sh, and Sk, respectively, and the rotor core R is indicated by an arrow. Rotate in the direction. And the rotor core R
However, the salient poles Rb, Rd, Rf and Rh of the rotor core R face the salient poles Sb, Se, Sh and Sk, respectively, the salient pole Rc is between the salient poles Sc and Sd, and the salient pole Re is the salient poles Sf and Sg.
The salient pole Rg is located between the salient poles Si and Sj, and the salient pole Ra is located between the salient poles Sa and Sl (15).
When the current is switched from the energization to the W-phase coil CLw to the energization to the V-phase coil CLv at the time when the motor rotates in the direction indicated by the arrow in FIG.
e, Rg and Ra are attracted to the salient poles Sc, Sf, Si and Sl, respectively, and the rotor core R rotates in the direction of the arrow. Thus, every time the rotor core R rotates 15 degrees,
By switching the energized coils in the order of CLu-CLw-CLv, the rotor core R can be continuously rotated in the direction of the arrow in FIG.

[0004]

The shapes of the rotor core R and the stator core S of the switched reluctance motor SRM are set according to the output performance of the motor. As shown in FIG. 5, the outer diameter D1, the salient pole bottom diameter D20, the inner diameter D30 (corresponding to the outer diameter of the rotating shaft RS), the salient pole width, and the axial length are set in the rotor core R as shown in FIG. Is done. The salient pole bottom diameter D20 is set in consideration of the fact that the inductance ratio of the coil when the salient poles of the rotor and the stator are not opposed to each other is increased and the rotor side magnetic path is shortened.

In an actual product design, the width W0 of the annular yoke portion connecting the salient poles is reduced to the minimum required magnetic path width W1 due to the required outer dimensions and shaft diameter of the motor.
(See FIGS. 6 and 7). in this case,
As shown in FIG. 6, a hollow hole is formed in the annular yoke portion to reduce the weight, or as shown in FIG. 7, the inner diameter D31 is enlarged, and a spacer is interposed between the outer diameter of the rotary shaft RS and the outer diameter. I was letting it. However, in the case of FIG. 6, it is necessary to secure a width W2 for connection with the rotating shaft in the inner peripheral portion, and a large hollow hole cannot be obtained, and the effect of weight reduction is small. In the case of FIG. 7, the cost increases due to the increase in the number of components.

According to the invention of this application, the rotor core of the double salient pole type reluctance motor can be manufactured without increasing the cost.
The purpose is to reduce the weight.

[0007]

According to a first aspect of the present invention, in a rotor core of a double salient pole type reluctance motor, a salient pole bottom diameter is set to a minimum required magnetic path width for a diameter of a rotating shaft. And a rotor core of a double salient pole type reluctance motor characterized by having a dimension added with

According to a second aspect of the present invention, in the rotor core of the double salient pole type reluctance motor, the dimension of the salient pole bottom diameter is obtained by adding the minimum required magnetic path width to the diameter of the rotating shaft. A rotor core for a dual salient pole type reluctance motor, characterized in that a bore is formed in a yoke portion connecting salient poles so as to leave a minimum necessary magnetic path width on the inner diameter side.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) FIG.
2 shows a rotor core R according to the invention of FIG. In FIG. 1, the rotor core R has eight salient poles, and has an outer diameter dimension D1,
It has an inner diameter dimension D30 and a salient pole bottom diameter dimension D21.
The inner diameter dimension D30 is equivalent to the rotating shaft diameter dimension,
The salient pole bottom diameter D21 is a dimension obtained by adding the minimum required magnetic path width W1 to the inner diameter D30.

Since the magnetic path width W1 is provided on the outer diameter side of the inner diameter D30 corresponding to the diameter of the rotary shaft to the minimum necessary, the magnetic path width W1 is used for connection with the rotary shaft. Since it also functions as a width portion, it is lighter than those shown in FIGS. Although the length of the magnetic path in the salient pole increases, the length of the magnetic path connecting the salient poles becomes shorter. Therefore, the magnetic path length of the entire rotor core is substantially equal to that shown in FIGS. It is almost equivalent to that of FIGS.

(Embodiment 2) FIG. 2 shows a rotor core R according to a second aspect of the present invention. In FIG. 2, the rotor core R
Has eight salient poles, an outer diameter dimension D1, an inner diameter dimension D30, and a salient pole bottom diameter dimension D20. The inner diameter dimension D30 corresponds to the rotation shaft diameter dimension. A hollow hole is formed in the yoke portion connecting the salient poles, and the minimum necessary magnetic path width W1 is formed on the inner diameter side.
And the outer diameter side width W3 is made as small as possible.

In FIG. 2 as well, the magnetic path width W1 is set to the minimum necessary on the outer diameter side of the inner diameter D30 corresponding to the diameter of the rotating shaft. Since it also functions as a width portion for connection to a shaft, it is lighter than those shown in FIGS. By using the iron plate at both ends in the axial direction of the rotor core as shown in FIG. 5 or covering other members so that the hollow hole of the yoke does not appear on the rotor surface, the windage loss is reduced as compared with that of FIG. This is because unevenness of salient poles is reduced as compared with that of FIG. Although the length of the magnetic path in the salient pole is increased, the length of the magnetic path connecting the salient poles is shortened. Therefore, the magnetic path length of the entire rotor core is substantially equal to that of FIGS.
Copper loss and iron loss are almost the same as those in FIGS.

[0013]

As described above, according to the rotor core of the double salient pole type reluctance motor according to the invention of the present application, the weight can be reduced without deteriorating the performance or increasing the cost.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a shape of a rotor core according to a first embodiment of the present invention;

FIG. 2 is a diagram illustrating a shape of a rotor core according to a second embodiment of the present invention;

FIG. 3 is a diagram showing a schematic configuration of a three-phase switched reluctance motor.

FIG. 4 is a diagram showing a winding state of each phase coil around a salient pole of a stator core.

FIG. 5 is a view showing a shape of a rotor core in FIG. 3;

FIG. 6 is a diagram showing a conventional example of the shape of a rotor core.

FIG. 7 is a diagram showing a conventional example of the shape of a rotor core.

[Explanation of symbols]

 SRM: Switched reluctance motor CLu: U-phase coil CLw: W-phase coil CLv: V-phase coil S: Stator core Sa to Sl: Salient pole R: Rotor core Ra to Rh ... Salient poles

Claims (2)

[Claims] In a rotor core of a double salient pole type reluctance motor, a salient pole bottom diameter is a diameter obtained by adding a minimum required magnetic passage width to a diameter of a rotating shaft. Rotor core of reluctance motor. 2. A rotor core of a double salient pole type reluctance motor, wherein a salient pole bottom diameter is larger than a diameter obtained by adding a minimum required magnetic path width to a diameter of a rotating shaft;
A rotor core for a dual salient pole type reluctance motor, wherein a hollow hole is formed in a yoke portion connecting the salient poles so as to leave a required minimum magnetic path width on the inner diameter side.