JP3303674B2 - Rotating electric machine and its cylindrical rotor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine and a cylindrical rotor thereof, and more particularly, to a rotating electric machine suitable for reducing a voltage fluctuation rate by providing a plurality of slots for winding a field winding. The present invention relates to an electric machine and its cylindrical rotor.

[0002]

2. Description of the Related Art A rotating electric machine includes a stator and a rotor. Synchronous machines are classified into a rotating armature type in which the field poles are fixed and the armature is rotated, and a rotating field type in which the armature is the stator and the field poles are the rotor. Further, the rotating field type synchronous machines can be classified into salient pole type rotors and cylindrical rotors. Generally, the salient pole type field is used for a water turbine generator or the like because the magnetomotive force of the field winding can be increased and the number of poles can be easily increased. Further, a cylindrical rotor has high mechanical strength and small windage loss, and is therefore used for a turbine generator driven by a steam turbine or a gas turbine.

[0003] In a cylindrical rotor used in a turbine generator, a field winding is distributed and housed in a plurality of slots provided in a cylindrical iron core. In order to hold down the field winding, a wedge is inserted into the slot head. The reason why the field winding is distributed winding and put in the slot is that the distribution winding of the field winding makes the magnetic flux density distribution of the air gap closer to a sine waveform, and the electromotive force waveform can be closer to a sine waveform That's why. Further, in order to make the waveform of the electromotive force at the time of no load approximate to a sine waveform, a method of making the depth of the slot closest to the magnetic pole shallower than the depths of other slots has been adopted. However, at the time of load, the magnetic flux density distribution is distorted due to the armature reaction magnetomotive force, and therefore, as described in JP-A-49-45307, the slot at the position where the magnetic flux density becomes maximum under the load is changed to another slot. A method has been proposed in which the harmonic component in the magnetic flux density distribution under load is reduced by making the slot narrower and deeper than the slot width.

[0004]

The above prior art is a rotor structure for making a voltage waveform induced in an armature winding close to a sine wave. In this prior art, a predetermined short circuit ratio is obtained. Therefore, the machine size of the rotating electric machine must be increased. For the reasons described below, it is more problematic that the machine size of the rotating electric machine is increased in order to obtain a predetermined short-circuit ratio rather than a voltage waveform.

[0005] A curve showing the relationship between the terminal voltage and the field current when the generator is operating at no load at the rated speed is called a no-load saturation curve. On the other hand, a curve indicating the relationship between the short-circuit current and the field current when the generator is short-circuited and operated at the rated speed is called a short-circuit curve. Here, the short-circuit ratio is defined as the field current I _f0 required to generate the rated voltage with no load at the rated speed, and the field current I _fa required to generate the three-phase short-circuit current equal to the rated current. It is represented by the ratio a (a = I _f0 / I _fa ).

[0006] Machines having a large short-circuit ratio are so-called iron machines, which have a relatively small amount of copper and a relatively large amount of iron when viewed from the constituent materials. In this case, the price is high,
Fixing loss such as mechanical loss becomes large, and efficiency becomes poor. However, on the other hand, there is an advantage that the voltage fluctuation rate is small, the stability and the line charging capacity are large.

A machine having a short circuit ratio is a so-called copper machine in which the number of armature windings is larger than the standard, the machine size is small, and copper is used relatively much as a constituent material. The armature reaction is large, and the armature leakage reactance is also large. In the case of a generator, the voltage fluctuation rate should be as small as possible and the stability and the line charging capacity should be large. Therefore, the air gap between the stator and the rotor should be increased, or the number of windings of the armature winding should be reduced to reduce the field. Increase the short circuit ratio by increasing the number of magnetic fluxes. But,
Increasing the air gap between the stator and the rotor increases the machine size of the generator and increases the field current under load. In order to increase the number of field magnetic fluxes by reducing the number of windings of the armature winding, the field current must be increased in order to increase the number of field magnetic fluxes. In order to increase the field current, the capacity of the excitation power supply for exciting the field winding must be increased, which increases the cost.

On the other hand, in the slot shape described in Japanese Patent Application Laid-Open No. 49-45307, there is almost no effect of increasing the short-circuit ratio, and since there are several types of slot shapes, slot machining is not easy. The shape of the field winding to be accommodated therein also changes according to the shape of the slot, leading to problems such as an increase in cost.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cylindrical rotor for a rotating electric machine having a small voltage fluctuation rate, that is, a high stability, in which the short-circuit ratio is increased in consideration of an increase in cost.

[0010]

In order to achieve the above object, the present invention provides a cylindrical rotor having a plurality of slots for winding a field winding. When the center direction of the magnetic pole is d-axis and the direction between the magnetic poles is q-axis, the distance between the slots formed on the d-axis side is shorter than that of the other slots formed at the same depth. It is characterized by the following.

A cylindrical rotor in which a plurality of slots for winding a field winding is formed, wherein the direction of the center of the magnetic pole of the cylindrical rotor is d-axis, and the direction between the magnetic poles is q-axis. When
The width of the slot formed on the d-axis side is formed to be greater than the width of the other slot, and the depth of the slot formed on the d-axis side is formed deeper than the depth of the other slot. It is assumed that.

A cylindrical rotor in which a plurality of slots for winding a field winding is formed, wherein the direction of the magnetic pole center of the cylindrical rotor is d-axis, and the direction between the magnetic poles is q-axis. When
The width of the slot formed on the d-axis side is formed to be equal to or greater than the width of the other slot, and the depth of the slot formed on the d-axis side is formed to be equal to the depth of the other slot; and A second slot is formed at the bottom of the slot formed on the d-axis side.

Further, when a cylindrical rotor having a plurality of slots for winding a field winding is provided, and a center of a magnetic pole of the cylindrical rotor is a d-axis and a direction between magnetic poles is a q-axis, The width of the first slot formed on the d-axis side is formed to be equal to or greater than the width of the other slot, and the first slot is further positioned on the d-axis side than one of the slots formed on the d-axis side. And a second slot deeper than the depth of the second slot is provided.

Further, when a cylindrical rotor having a plurality of slots for winding a field winding is provided, and a center of a magnetic pole of the cylindrical rotor is a d-axis and a direction between magnetic poles is a q-axis, Of the slots formed on the d-axis side, the width of the slot at a position on the leading side of the d-axis with respect to the rotation direction of the rotor is equal to or greater than the width of the other slots, and is deeper than the depths of the other slots. It is characterized by having done.

Further, when a cylindrical rotor having a plurality of slots for winding a field winding is formed, and the center of the magnetic pole of the cylindrical rotor is d-axis and the direction between the magnetic poles is q-axis, Among the slots formed on the d-axis side, the width of the slot at a position on the leading side from the d-axis with respect to the rotation direction of the rotor is equal to or greater than the width of the other slots, and the plurality of slots are cylindrical. It is formed to have the same width in the outer circumferential direction of the shaped rotor, and is formed in a shape in which the width becomes narrower toward the bottom at the bottom of the slot, and when provided on the rotor, the d-axis side and the The slot having the same width in the slot on the leading side of the d-axis with respect to the rotation direction of the rotor is made deeper than the same width in the other slots.

A cylindrical rotor provided with a plurality of slots for winding a field winding, wherein the direction of the center of the magnetic pole of the rotor is d-axis, and the direction between the magnetic poles is q-axis. , D
Slots are provided in the field pole portion on the shaft side and at a position advancing from the d-axis with respect to the rotation direction of the cylindrical rotor so as to reduce the width of the magnetic pole.

[0017]

1 to 4 show an embodiment of the present invention.
This will be described below.

FIG. 1 is a cross-sectional view of a cylindrical rotor of a rotary electric machine according to this embodiment, FIG. 2 is a view showing a magnetic flux density distribution under no load, and FIG. 3 is a view showing a magnetic flux density distribution under load. FIG. 4, FIG.
Is a vector diagram of magnetomotive force.

In general, the cylindrical rotor 1 of the rotating electric machine is generally made of a block of forged steel, including the main shaft, field poles, and iron core.
A high-tensile alloy steel of a magnetic material is used. As shown in FIG. 1, a slot 2, a slot 3, a slot 4 and a slot 5 are cut radially in an iron core portion of the cylindrical rotor 1, and the inside of the slot 2, the slot 3, the slot 4 and the slot 5 is provided. The field winding 6 is held down, and is fixed with a wedge 7 so that the field winding 6 does not protrude. Also, the interval 8 between slot 2, slot 3, slot 4 and slot 5
Are formed to be constant. Here, as shown in FIG.
The direction of the center of the magnetic pole of the cylindrical rotor is called the d-axis, and the direction between the magnetic poles is called the q-axis.

As shown in FIG. 13, the conventional cylindrical rotor 1 has a slot 2 and a slot 2 closest to the magnetic pole in order to make the waveform of the electromotive force close to a sine wave, that is, to make the magnetic flux density distribution of the air gap close to a sine wave. The depth of the slot 3 is smaller than the depths of the slots 4 and 5.

In FIG. 2 showing the magnetic flux density distribution in the air gap when no load is applied, the solid line 14 _applies the same current _If02 to the field winding 6 in the prior art and the dotted line 15 _{applies the} current _If02 in the present embodiment. The magnetic flux density distribution at the time of performing is shown. As can be seen from FIG. 2, as shown in FIG. 1, when the depths of the slots 2 and 3 are formed to be greater than the depths of the slots 4 and 5, the magnetic flux density in the magnetic pole portion 11 is larger than that shown in FIG. Is distorted, the harmonic component of the density per hour increases, and the waveform deviates from the sine wave distribution.

The reason will be described with reference to FIG. When no load is applied, the armature winding (not shown) is in an open state, so that the magnetomotive force generated in the rotating electric machine is only the field magnetomotive force Ff, and the field magnetomotive force Ff is in the same direction as the d-axis. Occurs, d
It is represented by an axial vector. Since the field windings 6 and the wedges 7 constituting the cylindrical rotor 1 are made of a non-magnetic material, the magnetic flux generated by the field magnetomotive force Ff passes through the magnetic pole portion 11 in the d-axis direction. Therefore, even if the magnetic pole opening 12 has the same value, if the slots 2 and 3 are formed deeply, the distance between the slots 2 and 3, that is, the magnetic pole width 10 becomes short, so that the slots 2 and 3 Only the magnetic flux density during the period increases. Here, as shown in FIG. 13, when the depth of the slots 2 and 3 is formed shallower than the depth of the slots 4 and 5, the field current required to generate the rated voltage at the rated speed is represented by I. _{Assuming f02} , in the case of the rotor cross section as shown in FIG. 1, when I _f02 is applied to the field winding 6, the voltage induced in the armature winding has a higher harmonic component than that shown in FIG. No rated voltage can be induced. That is,
When the depth of the slot 2 and slot 3 as shown in FIG. 1 is a field current required to generate the rated voltage at the rated speed when deeper than the depth of the slot 4 and slots 5 and I _f01, I _f01> I _f02 become that way.

On the other hand, when a three-phase short circuit occurs, an armature reaction magnetomotive force Fa is generated so as to cancel the field magnetomotive force Ff, so that the magnetic flux in the rotating electric machine becomes almost zero, and a three-phase short-circuit current equal to the rated current is generated. The field current I _fa required for the operation is _independent of the shapes of the slots 2, 3, 4 and 5.

FIG. 3 showing the magnetic flux density distribution under load shows that the same current Ifind is applied to the field winding 6 in the cross-sectional structure of the rotor shown in FIG. 1 and the cross-sectional structure of the rotor shown in FIG.
In FIG. As shown in FIG. 4, at the time of load, an armature reaction magnetomotive force Fa is generated in addition to the field magnetomotive force Ff. In this case, the vector F becomes a vector F in the direction delayed. Therefore, the magnetomotive force F in the rotating electric machine under load has little effect on the magnetic flux density distribution even if the depths of the slots 2 and 3 are increased, and the magnetic flux density distribution is as shown by a curve 17 in FIG. As shown in FIG. 13, when the depth of the slots 2 and 3 is shallower than the depth of the slots 4 and 5, compared to the magnetic flux density distribution indicated by the curve 16 in FIG. It is only about small. As described above, when the number of windings of the field windings accommodated in the slots 2 and 3 shown in FIGS. 1 and 13 is the same, the structure shown in FIG. , The field current slightly increases, but is not a problem in practical use.

[0025] As described above, the depth of the slots 2 and 3 deeper than the depth of the slot 4 and slot 5, the field current I _f0 is extremely large at the time of no load, the three-phase field current during short-circuit Since I _fa does not change, the short-circuit ratio a (= I _f0 /
_Ifa ) increases, and the field current under load is almost the same. Therefore, the performance under load is almost the same as the current model,
Voltage fluctuation rate is small and stability is high.

Next, the width of slots 2 and 3 is
The reason why the thickness is made equal to or larger than the width of (5) and (5) will be described. When the widths of the slots 2 and 3 are made narrower than the widths of the slots 4 and 5, the distance between the slots 2 and 3, that is, the width 10 of the magnetic pole becomes wider by that amount, and the effect of making the slots 2 and 3 deeper is obtained. Reduced, slots 2 and 3
The width of the field winding 6 housed therein is also reduced. In this case, it is necessary to separately manufacture a field winding having a shape different from the shape of the field winding 6 housed in the slots 4 and 5, which causes a problem such as an increase in cost.

The width of slots 2 and 3 is
Is wider than the width of the slots 2, 3 even if the shape of the field winding 6 is the same as the field windings in the slots 4 and 5.
The method of thickening the insulation between the inner surface and the interlayer can be adopted, and the production can be performed with almost no change in the production cost.

Further, assuming that a predetermined short-circuit ratio a is obtained with the conventional structure shown in FIG. 13, the short-circuit ratio can be made sufficiently larger than the short-circuit ratio a in the structure of this embodiment shown in FIG. Therefore, when the short-circuit ratio is set to the same value as that in the case shown in FIG. 13, the air gap can be narrowed accordingly, and the machine size of the generator can be reduced.
Another embodiment of the present invention will be described with reference to FIG. FIG. 5 is a cross-sectional view of the cylindrical rotor of the rotary electric machine according to the present embodiment.

As described above, the slots 2, 3, 4, and 5 of the iron core of the rotor 1 are provided radially, but the stress of the teeth 18 is
It is highest at the bottom and lowers closer to the mouth.
Therefore, if the slot pitch 8 is made to the depth of the slots 4 and 5 at the limit of the stress of the teeth 18, the depths of the slots 2 and 3 are larger than the depths of the slots 4 and 5. When it is deep, it does not have any stress. If the slot pitch 8 with respect to the depth of the slots 4 and 5 is the limit on the stress of the teeth 18, it is necessary to make the slot pitch 9 larger than the slot pitch 8. With this structure, the problem of the stress of the teeth 18 is eliminated, and the effect is the same as that of the embodiment shown in FIG.

Another embodiment of the present invention will be described with reference to FIG. FIG. 6 is a cross-sectional view of the cylindrical rotor of the rotary electric machine according to the present embodiment.

When the slot from the slot 2 to the slot 5 (the slot 5 has the same shape as the slot 4 and is not shown in the drawing) is cut radially in the core portion of the cylindrical rotor 1, the slot width becomes smaller. In the case where the stress is the same from the bottom to the bottom, the stress of the teeth 18 becomes the highest at the bottom of the slot and becomes lower as it approaches the mouth, so that the bottom of the slot 2 to the slot 5 may be tapered to reduce the stress at the bottom of the slot. is there.

When the slot shape having the tapered portion is cut into the iron core portion of the rotor 1, the tapered portions 23 and 24 of the slot 2 and the slot 3 have the same shape, and only the straight portions 20 and 21 are formed as the straight portion 22. Compare and deepen. The reason for this is that if the tapered portions have the same shape, only one type of cutter forms the tapered portions 23 to 25 of the slots 2 to 4, which does not lead to an increase in cost. This is the same as the depth of the slots 2 and 3 being made deeper than the depth of the slots 4 and 5, so that the effect is the same as that of the embodiment shown in FIG.

Another embodiment of the present invention will be described with reference to FIG. FIG. 7 is a sectional view of the rotor coil of the present embodiment.

As described above, when the slots 2 and 3 are deeper than the slot 4, the field current at the time of load increases, albeit slightly. Therefore, the number of turns is made larger than that of the slot 4 by the depth of the slots 2 and 3. For example, the number of turns of the slot 4 is 5 turns (shown by 6A to 6E), and the number of turns of the slots 2 and 3 is 6 turns (shown by 6A to 6F). Since the number of turns in the entire rotor is increased by 2 turns compared to the number of turns when slots 2 and 3 have 5 turns, the desired ampere turn can be obtained even if the current flowing through the field winding is reduced by the increased number of turns. Obtainable. That is, while increasing the depth of the slots 2 and 3, the slots 2 and 3
By increasing the number of windings of the field winding wound inside, the field current can be made equal to or less than that shown in FIG. As a result, the short-circuit ratio can be increased without increasing the field current at the time of load.

When the slots 2, 3 and 4 are formed into a shape having a tapered portion as shown in FIG. 7, the shape of the field windings 6A to 6F is such that their current densities are substantially constant. Therefore, the thicknesses of the field windings 6A and 6B in the tapered portion are made thicker than the field windings 6C to 6E. That is,
In FIG. 7, four types of field windings (6
A, 6B, 6C, 6D or 6E), and the field windings 6D and 6E of the straight portion are formed identically.

Therefore, when the depth of the slots 2 and 3 is made deeper than that of the slot 4, only the straight portions of the slots 2 and 3 are formed longer, and the thickness of the field winding 6F and the field winding 6E and the field winding 6E are formed. It is made deeper by the length of the sum of the interlayer insulation between the lines 6F. With this configuration, only four types of field windings in slots 2 and 3 can be used, and the same field winding as slot 4 can be used. In addition, since the number of turns of the entire cylindrical rotor 1 is increased by an increase in the number of turns of the slots 2 and 3,
An equivalent ampere-turn can be obtained even if the current flowing through the field winding is reduced.

FIG. 7 shows the case where the depth of the slots 2 and 3 is made one turn deeper than the depth of the slot 4. However, if there is no problem in stress, the depth may be made two or more turns. The current flowing through the winding can be reduced,
It goes without saying that the short circuit ratio can be further increased.

Another embodiment of the present invention will be described with reference to FIG. FIG. 8 is a sectional view of a cylindrical rotor of the rotating electric machine according to the present embodiment.

As described above, if slot 2 and slot 3 are made deeper than slot 4 and slot 5,
The field current at the time of load is small but large. As shown in FIG. 4, since the magnetomotive force F under load becomes maximum at a position delayed by θ with respect to the rotation direction of the rotor, the slot 3 is not made deeper than the slots 4 and 5, and only the slot 2 is provided. Deepen. At this time, the width of the slot 2 is equal to or greater than that of the slots 3 to 5 as described above.

With this configuration, the distance 10 between the slot 2 and the slot 3 is shorter than that of the cross section of the rotor 1 as shown in FIG. 13, so that the harmonic component of the magnetic flux density under no load increases. As a result, the short circuit ratio also increases. The magnetic flux density distribution under load becomes the same as that of the rotor cross section shown in FIG. 13, and the field current under load does not change. Therefore, the short-circuit ratio can be increased without changing the performance under load and without increasing the machine size of the rotating electric machine. As a result, the voltage fluctuation rate decreases, and the stability can be increased.

Another embodiment of the present invention will be described with reference to FIG. FIG. 9 is a cross-sectional view of the cylindrical rotor of the rotary electric machine according to the present embodiment.

In the case where the slot pitch 8 is made to the limit of the stress of the teeth 18 with respect to the depth of the slots 4 and 5, when the slot 2 is deeper than the slots 3, 4 and 5, the stress is also reduced. I will not be. In such a case, the slot pitch 9 needs to be larger than the slot pitch 8. Here, since the slot 3 has the same shape as the slots 4 and 5, the slot pitch 13 does not need to match the slot pitch 9. With such a structure, the problem of the stress of the teeth 18 is eliminated, and the effect is the same as that of the embodiment shown in FIG.

Another embodiment of the present invention will be described with reference to FIG. FIG. 10 is an enlarged cross-sectional view of the cylindrical rotor of the rotary electric machine according to the present embodiment.

As shown in FIG. 10, slots 2 to 4
Is tapered at the bottom of the slot,
As described above, when the depth of the slot 2 is formed deeper than the depth of the slots 3 and 4, the tapered portion 23 has the same shape as the tapered portions 24 and 25, and the straight portion 20 is made longer. When formed in this manner, the tapered portion 23 of the slot 2
The same cutter can be used for forming the slot and the cutter used for forming the slot 3 and the slot 4, which does not lead to an increase in cost. The effect of such a structure is the same as that of the embodiment shown in FIG.

Another embodiment of the present invention will be described with reference to FIG. FIG. 11 is a sectional view of a cylindrical rotor of the rotating electric machine according to the present embodiment.

In the embodiment shown in FIG. 11, the depth of the slots 2 and 3 is formed to be the same as the depth of the slots 4 and 5. In order to increase the short-circuit ratio a, the width 10 of the field pole may be reduced. Therefore, a narrow slot 26 is provided at the bottom of the slots 2 and 3. The width of the field pole 10 is reduced by the slot 26 at the bottom, and the same effect as in the embodiment shown in FIG. 1 can be obtained.

FIG. 12 shows the case where the depth of the slots 2 and 3 is the same as the depth of the slots 4 and 5, but the depth of the slots 2 and 3 is formed shallower than the depth of the slots 4 and 5. Even in this case, the slot 26 may be deepened accordingly. Further, the slot 26 may be provided only in the slot 2 to reduce the width 10 of the field pole, and in this case, the same effect as in the embodiment shown in FIG. 1 can be obtained.

Another embodiment of the present invention will be described with reference to FIG. FIG. 12 is a sectional view of a cylindrical rotor of the rotating electric machine according to the present embodiment.

As shown in FIG. 12, in this embodiment, a narrow slot 26 is provided on the d-axis side of the slot 2 so as to reduce the width 10 of the magnetic pole. With this configuration, the width 10 of the magnetic pole can be reduced, and the same effect as the embodiment shown in FIG. 7 can be obtained.

[0050]

As described above, according to the present invention,
It is possible to reduce the machine size of the rotating electric machine,
The short circuit ratio can be increased without increasing the cost.
As a result, the voltage fluctuation rate decreases, and the stability can be increased.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a cylindrical rotor of a rotary electric machine according to an embodiment of the present invention.

FIG. 2 is a diagram showing a magnetic flux density distribution of the present embodiment when no load is applied.

FIG. 3 is a diagram showing a magnetic flux density distribution at the time of load of the embodiment.

FIG. 4 is a vector diagram of a magnetomotive force according to the present embodiment.

FIG. 5 is a cross-sectional view of a cylindrical rotor of a rotary electric machine showing another embodiment of the present invention.

FIG. 6 is an enlarged cross-sectional view of a cylindrical rotor of a rotary electric machine showing another embodiment of the present invention.

FIG. 7 is a cross-sectional view of a rotor coil of a rotary electric machine according to another embodiment of the present invention.

FIG. 8 is a cross-sectional view of a cylindrical rotor of a rotary electric machine showing another embodiment of the present invention.

FIG. 9 is a cross-sectional view of a cylindrical rotor of a rotary electric machine showing another embodiment of the present invention.

FIG. 10 is an enlarged cross-sectional view of a cylindrical rotor of a rotary electric machine according to another embodiment of the present invention.

FIG. 11 is a cross-sectional view of a cylindrical rotor of a rotary electric machine showing another embodiment of the present invention.

FIG. 12 is a cross-sectional view of a cylindrical rotor of a rotary electric machine showing another embodiment of the present invention.

FIG. 13 is a cross-sectional view showing a structure of a cylindrical rotor of a conventional rotary electric machine.

[Explanation of symbols]

1 ... rotor, 2, 3, 4, 5, 26 ... rotor slot
6 ... field winding, 7 ... wedge, 8, 9, 13 ... rotor slot pitch, 10 ... field pole width, 11 ... field pole, 12 ... magnetic pole opening, 14, 15 ... magnetic flux density at no load Distribution, 16,1
7: magnetic flux density distribution under load, 18: rotor teeth, 1
9 ... crease page block, 20, 21, 22 ... straight portion of rotor slot, 23, 24, 25 ... taper portion of rotor slot.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuhiko Takahashi 7-2-1, Omika-cho, Hitachi City, Ibaraki Prefecture Within Hitachi, Ltd. Power & Electric Equipment Development Division (72) Inventor Mika Takahashi Omika-cho, Hitachi City, Ibaraki Prefecture 7-2-1, Hitachi, Ltd. Power and Electricity Development Division (72) Inventor Motoya Ito 7-1-1, Omika-cho, Hitachi City, Ibaraki Prefecture Hitachi, Ltd. Hitachi Research Laboratory (72) Inventor Miyagawa Ieda Hitachi, Ltd., Hitachi Plant, 3-1-1, Sachimachi, Hitachi City, Ibaraki Prefecture (72) Inventor Atsushi Ishihara 3-1-1, Sachimachi, Hitachi, Hitachi City, Ibaraki Prefecture, Ltd. Hitachi, Ltd., Hitachi Plant (72) Inventor Yasuomi Yagi 3-1-1, Sachimachi, Hitachi City, Ibaraki Pref. Hitachi, Ltd.Hitachi Plant (72) Inventor Ryoichi Shiobara Date in Ibaraki Prefecture 3-1-1, Ichiyukicho Hitachi, Ltd. Hitachi Plant (56) References JP-A-60-245438 (JP, A) JP-A 53-152110 (JP, U) JP-A 49-54003 ( JP, U) JP-A 51-89102 (JP, U) JP-A 58-105782 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02K 1/26 H02K 3/04

Claims (5)

(57) [Claims] 1. A cylindrical rotor having a plurality of slots for winding a field winding, wherein the direction of the center of the magnetic pole of the cylindrical rotor is d-axis, and the direction between the magnetic poles is q-axis. At this time, the distance between the slots formed on the d-axis side is shorter than the case where they are formed at the same depth as the other slots, and the width of the teeth between the slot closest to the d-axis and the adjacent slot is other teeth. A cylindrical rotor formed so as to be equal to or less than a part width. 2. A cylindrical rotor in which a plurality of slots for winding a field winding are formed, said plurality of slots being radially arranged, and a direction of a magnetic pole center of said cylindrical rotor being d. When the axis and the direction between the magnetic poles are the q-axis, the width of the slot formed on the d-axis side is set to be equal to or greater than the width of the other slots, and the depth of the slot formed on the d-axis side is A cylindrical rotor formed deeper than other slots. 3. A cylindrical rotor having a plurality of slots for winding a field winding, wherein a center of a magnetic pole of the cylindrical rotor is a d-axis, and a direction between magnetic poles is a q-axis. When the width of the slot formed on the d-axis side is formed to be equal to or greater than the width of the other slot, the depth of the slot formed on the d-axis side is formed to be equal to the depth of the other slot. And a second slot formed at the bottom of the slot formed on the d-axis side. 4. A cylindrical rotor in which a plurality of slots for winding a field winding are formed, the plurality of slots are radially arranged, and the center of the magnetic pole of the cylindrical rotor is d-axis.
When the direction between the magnetic poles is the q-axis, the width of the first slot formed on the d-axis side is formed to be greater than the width of the other slots, and any one of the slots formed on the d-axis side is used. A cylindrical rotor further provided with a second slot deeper than the first slot on the d-axis side than one. 5. A cylindrical rotor in which a plurality of slots for winding a field winding are formed, wherein a center of a magnetic pole of the cylindrical rotor is a d-axis, and a direction between magnetic poles is a q-axis. Of the slots formed on the d-axis side, the width of the slot at a position on the leading side of the d-axis with respect to the rotation direction of the rotor is equal to or greater than the width of the other slots, and is deeper than the depths of the other slots. A cylindrical rotor for a rotating electric machine, characterized in that: