JPH05111202A - Rotating machine rotor - Google Patents

Abstract

(57) [Summary] [Purpose] The size and weight of the rotating electrical machine has been reduced, the range of rotational speed has been expanded,
An object of the present invention is to obtain a rotor of a rotary electric machine that can improve efficiency. [Structure] The number of slots 12 is equal to the number of poles of the rotating electric machine, the total opening width t of the slots 12 is set to 70% or more of the diameter of the cylindrical iron core 11, and the openings of the slots 12 in which the rotor winding 13 is wound. Since the nonmagnetic slot closing body 14 is attached to the portion, the magnetic circuit can be simplified and a large amount of field magnetic flux can be passed, so that a small-sized and high-output rotating electric machine can be obtained. Further, by mounting the slot closing body 14 in the opening of the slot 12, it is possible to make a robust structure that can withstand high speed rotation. Further, since the number of slots can be made equal to the number of rotating electric machines, the number of poles can be increased, so that the efficiency at low speed operation can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of a rotor of a rotary electric machine.

[0002]

2. Description of the Related Art In recent years, there have been increasing demands for reducing the size and weight of rotating electric machines, expanding the range of rotational speed, improving efficiency (in particular, improving efficiency during low-speed operation). In particular, for automobile alternators, the above-mentioned demands have become very strong from the viewpoint of reducing the energy consumption of the entire automobile, expanding the range of engine speed, and preventing engine knocking during idling.

The structure of the rotor of a conventional vehicle alternator will be described below with reference to FIGS. 8 and 9.

In FIG. 8, 1 is a rotor core, 2 is a rotor coil wound around the rotor core to generate a field magnetic flux,
3 is a slip ring for supplying a current to the rotor coil, 4
Is a brush thereof, 5 is a stator core provided to face the outer peripheral surface of the rotor core to form a magnetic circuit, and 6 is a stator coil wound around the stator core to generate an output current.
Φ indicates the flow of field magnetic flux.

FIG. 9 is a perspective view showing only a rotating portion of an alternator for an automobile, in which a rotor coil 2 is wound so as to be wrapped in a rotor core 1.

In the above structure, when a substantially direct current is supplied to the rotor coil 2 from the brush 4 and the slip ring 3, a field magnetomotive force is generated in the rotor coil 2. Due to this field magnetomotive force, a field magnetic flux Φ flows in a magnetic circuit composed of the rotor core 1 and the stator core 5, and the stator coil 6 is related to the number of rotations of the rotor core 5 and the number of poles of the alternator. AC electromotive force of the frequency is generated. By extracting this energy, it becomes a generator. Normally, the alternator transmits the shaft output of the engine by accelerating it with a pulley and a belt, and the rotation speed exceeds 10,000 rpm at the maximum,
Since the rotor coil 2 is provided so as to be wrapped in the rotor core 1, it is robust and can withstand high speed rotation. Further, in particular, the alternator for automobiles has a large number of poles because it is necessary to improve the efficiency during low speed operation such as idling operation.
The pole is the mainstream.

[0007]

In such a conventional alternator, as shown by an arrow in FIG. 8, the field magnetic flux Φ advances axially in the inner diameter portion of the rotor core 1, and then in the rotor core 1. Radially spreads at the axial end portion of the rotor core 1 and further flows through the outer diameter portion of the rotor core 1 in a direction opposite to the traveling direction of the inner diameter portion to flow into the stator core 5 and interlink with the stator coil 6, and then The magnetic circuit is very complicated because it flows back to the rotor core 1 and gathers at the opposite axial end of the rotor core 1 and returns to the inner diameter of the rotor core 1. Therefore, since a large amount of the field magnetic flux Φ cannot be flowed, there is a problem that the size and weight cannot be reduced and the efficiency cannot be improved.

The present invention solves the above problems, and provides a rotor for a rotary electric machine, which is capable of reducing the size and weight of the rotary electric machine, expanding the rotational speed range, and improving efficiency (in particular, efficiency improvement during low-speed operation). The purpose is to do.

[0009]

In order to achieve the above object, the present invention provides a plurality of slots of substantially the same shape, which are provided in a cylindrical iron core and open to the outer peripheral surface of the cylindrical iron core, and are wound around the slot. The number of slots is equal to the number of poles of the rotating electric machine, the total opening width of the slots is 70% or more of the diameter of the cylindrical iron core, and the winding is wound. A non-magnetic slot closing body is attached to the opening of the slot thus formed.

[0010]

With the above-described structure, the present invention can simplify the magnetic circuit and allow a large amount of field magnetic flux to flow, thus providing a small-sized and high-output rotating electric machine. By attaching a non-magnetic slot closing body to the opening of the slot, a robust structure that can withstand high-speed rotation is obtained. In addition, since the number of poles can be increased by making the number of slots equal to the number of poles of the rotating electric machine, the efficiency at low speed operation can be improved. Furthermore, by setting the total opening width of the slots to 70% or more of the outer diameter of the cylindrical iron core, vibration and noise during operation of the rotating electric machine due to magnetic flux concentration at the opening portions of the slots,
The distortion of the generated voltage waveform when used as a generator can be eliminated.

[0011]

(Embodiment 1) An embodiment of the present invention will be described below with reference to FIGS. 1 to 7.

In FIG. 1, 11 is a cylindrical iron core, 12 is a cylindrical iron core 11, and a plurality of slots of substantially the same shape which are open to the outer peripheral surface of the cylindrical iron core 11 have an opening width t.
Is formed to be 70% or more of the diameter d of the cylindrical iron core 11. Reference numeral 13 is a rotor winding wound around the slot 12. In order to make the number of slots 12 equal to the number of rotating electric machine poles (12 poles in the embodiment), the rotor winding 13 is connected to any one slot 12. Is wound in a bobbin shape in the other slot 12 adjacent to. It should be noted that although shown in the drawing as being wound in a bobbin shape, the slot 12
Any winding method can be used as long as the number of windings is equal to the number of poles of the rotating electric machine. Reference numeral 14 is a non-magnetic slot closing body 14 inserted into the opening of the slot 12 and having both ends 14a protruding from both ends of the cylindrical iron core 11 to prevent the rotor winding 13 from being discharged by centrifugal force. Φ indicates a part of the flow of the field magnetic flux (the stator side is not shown). In addition,
Instead of the slot closing body 14, a synthetic resin mixed with glass fiber may be filled to close the opening of the slot 12.

In the rotor of the rotating electric machine constructed as described above, the flow of the field magnetic flux Φ is very simple as compared with the conventional example, and a large amount of the field magnetic flux Φ can be flowed, so that it is small in size. Not only can a high-output rotating electric machine be used, but a non-magnetic slot closing member 14 mounted in the opening of the slot 12 prevents the rotor winding 13 from being discharged due to centrifugal force, so that the structure is robust. Therefore, the rotating electrical machine can withstand high speed rotation. Further, the number of poles can be increased by making the number of slots 12 equal to the number of poles of the rotary electric machine, so that the efficiency at low speed operation can be increased. In addition, the opening width t of the slot 12
Since 70% or more of the outer diameter d of the cylindrical iron core 11 is set, the number of slots 12 and the number of poles of the rotating electric machine are equalized. Noise or distortion of the generated voltage waveform when used as a generator can be eliminated.
Incidentally, the opening width t of the slot 12 and the cylindrical core 11 are shown in FIG.
The ratio of the generated voltage waveform to the diameter d of 33% and that of 93% are shown in comparison. From this comparison, although not shown, it was found that at 70% or more, a waveform having no problem in practical use can be obtained.

In FIG. 2, a plurality of slots 12 are formed by spirally skewing a cylindrical iron core 11 in the axial direction, and vibration, noise, or distortion of generated voltage can be eliminated.

FIG. 3 shows that the projecting portions 14a of the slot closing bodies 14 projecting from both ends of the cylindrical iron core 11 are reinforced, and the non-magnetic slot closing body 14 has the same diameter as that of the flat or cylindrical iron core 11. It is formed in an arc shape having substantially the same curvature and is mounted in the slot 12 to prevent the rotor winding 13 from being discharged from the slot 12 by centrifugal force. Then, a reinforcing member 15 formed of a non-magnetic material and having an annular shape is fitted and fitted on the outer periphery of the projecting portion 14a projecting from both ends of the cylindrical iron core 11. The reinforcing material 15 reinforces the slot closing body 14, and thus can prevent the rotor from being destroyed by the centrifugal force applied to the rotor winding 13 when the electric machine is rotating.

FIGS. 4, 5 and 6 show another embodiment for reinforcing the slot closing body 14. In FIG. 4, a non-magnetic reinforcing material 16 having a hook 16a in the axial direction is used as the center of the rotor shaft. It is provided in a bridge shape between the rotor windings 13 at symmetrical positions, and the protruding portion 14a of the slot closing body 14 is reinforced by the hook 16a. Further, FIG. 5 shows the slot closing body 1
4 is curved in the direction of the rotation axis of the cylindrical iron core 11 to form a reinforcing portion. Furthermore, FIG.
Means that the protruding portion 14a of the slot closing body 14 is attached to the cylindrical core 1
1 is bent in the direction of the rotation axis to form a reinforcing portion. With the configuration shown in FIGS. 4 to 6, the same effect as that shown in FIG. 3 can be obtained.

[0017]

As is apparent from the above description of the embodiments, according to the present invention, a plurality of substantially same-shaped slots provided on the cylindrical core and opening to the outer peripheral surface of the cylindrical core, and the slots. The number of slots is equal to the number of poles of the rotating electric machine, and the total width of the openings of the slots is 70% or more of the outer diameter of the cylindrical iron core. By installing a non-magnetic slot closure in the slot opening, the structure of the magnetic circuit can be simplified and a large amount of magnetic flux can be made to flow, so it is compact, high output, and robust enough to withstand high-speed rotation. A rotating electric machine can be obtained.
Furthermore, since the number of poles can be increased, the efficiency at low speed operation can be increased.

As described above, according to the present invention, it is possible to provide a rotor for a rotary electric machine that can reduce the size and weight of the rotary electric machine, expand the number of revolutions, and improve efficiency.

[Brief description of drawings]

FIG. 1A is a perspective view of a rotor of a rotary electric machine according to an embodiment of the present invention, and FIG. 1B is a side sectional view of a rotor of the rotary electric machine.

FIG. 2 is a perspective view of a rotor of a rotary electric machine according to another embodiment.

FIG. 3 is a perspective view of a main part of a rotor of the rotating electric machine.

FIG. 4 is a side view of a rotor of the rotating electric machine.

FIG. 5 is a perspective view of a main part of a rotor of the rotating electric machine.

FIG. 6 is a perspective view of a main part of a rotor of the rotating electric machine.

FIG. 7 is a characteristic diagram of a voltage waveform generated by a rotor of the rotating electric machine.

FIG. 8 is a side sectional view of a conventional vehicle alternator.

FIG. 9 is a perspective view of a rotating portion of the vehicle alternator.

[Explanation of symbols]

 11 Cylindrical iron core 12 Slot 13 Rotor winding 14 Slot closing body 14a Projection of slot closing body 15 Reinforcement body d Diameter of cylindrical iron t Slot opening width Φ Field magnetic flux flow

Claims (4)

[Claims] 1. A number of the slots provided on a cylindrical iron core, comprising a plurality of slots of substantially the same shape which are open to the outer peripheral surface of the cylindrical iron core, and rotor windings wound around the slots. Is equal to the number of poles of the rotating electric machine, and the total opening width of the slots is 70% or more of the diameter of the cylindrical core,
A rotor of a rotating electric machine, wherein a nonmagnetic slot closing member is attached to an opening of a slot around which the rotor winding is wound. 2. The rotor of a rotating electric machine according to claim 1, wherein a plurality of slots are formed by applying a spiral skew in the axial direction. 3. A non-magnetic slot closing member is formed in a flat plate shape or an arc shape having a curvature substantially the same as the diameter of the rotor, and both ends of the slot closing member are projected from both ends of the rotor, The rotor of a rotary electric machine according to claim 1, wherein the protruding portion is reinforced with a reinforcing body made of a non-magnetic material. 4. The non-magnetic slot closing member is formed in a flat plate shape or an arc shape having a curvature substantially the same as the diameter outside the rotor,
Both ends of the slot closing body are projected from both ends of the rotor, the projecting portions of the slot closing body are curved in the rotor axial direction, or are bent in the rotor axial direction to form a reinforcing portion. The rotor of the rotating electric machine according to claim 1.