JP2002112478A - Rotor of permanent magnet generator-motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor of a permanent magnet generator-motor, which can prevent rattling or eccentricity in advance and effectively suppress vibration and noise. SOLUTION: A back yoke 5 is provided around a rotating shaft 4, and magnets 6 are attached in a ring around the back yoke 5. A sleeve 7 covers this assembly forming a gap s between the permanent magnets 6 and the back yoke 5. Energizing pieces 11 are provided in the gap s to push the magnets 6 to the reinforcing sleeve 7 so that the magnets 6 are always in close contact with the reinforcing sleeve 7 suppressing the noise and vibration caused by rattling or eccentricity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent magnet type generator / motor having excellent power generation or motor efficiency, and more particularly to a rotor structure provided on a rotating shaft side thereof.

[0002]

2. Description of the Related Art In recent years, as the functions and performance of automobiles, buses, trucks, and the like have become higher and higher, the power supplied to various electrical components has also increased dramatically. Engines have been installed in engines to meet these demands. There is a demand for improved performance (high power generation efficiency) for the generators that have been used.

On the other hand, in a truck equipped with a particulate filter for purifying diesel exhaust gas or a refrigerating car equipped with a refrigerating facility such as a compressor, it is necessary to regenerate the particulate filter or to drive the compressor. Since a large amount of electric power is required, a generator with higher performance is required.

As a method of easily satisfying such demands, it is conceivable to increase the size of the generator itself. However, the size of the generator is limited due to limited installation space and manufacturing costs. However, there are many issues in obtaining sufficient power.

Therefore, in recent years, a so-called permanent magnet type generator (motor) using a permanent magnet on the rotor side has been adopted as a generator for a vehicle or the like that requires such a large amount of electric power, unlike a conventional generator. Have been.

As shown in FIG. 6, this permanent magnet type generator employs a coil type as a stator 2 fixed to the inner wall side of a housing 1 and a rotor 3 rotatably provided at an axial center thereof. It is made of a permanent magnet, and has features such as excellent power generation efficiency (motor efficiency) and excellent durability and reliability because it can be configured with a simple structure.

[0007]

The rotor 3 of the permanent magnet generator has a ferromagnetic back yoke member 5 provided around a rotation shaft 4 as shown in FIGS. Generally, a plurality of magnet members 6 are arranged on the side surface of the material 5 in a ring shape, and a reinforcing sleeve 7 for preventing the scattering of the magnet members 6 is press-fitted and fitted around the periphery. However, in the conventional rotor 3 having such a structure, the following inconvenience may occur.

That is, since a large centrifugal force is applied to each of the magnet members 6, 6,... And the reinforcing sleeve 7 constituting the rotor 3 with high-speed rotation, as shown in FIG. Expands, each magnet member 6,6
, And the back yoke member 5, a gap s may be generated, and vibration and noise due to rattling may occur.

Fillers p are filled between the magnet members 6, 6,... To fill circumferential gaps, and as shown in FIG. Flows into the magnet member 6 and the reinforcing sleeve 7 by the magnet members 6,
6 may be pushed up to the back yoke material 5 side.
May be eccentric, the rotational balance may be lost, and vibration and noise may be generated.

[0010] Such rattling and eccentricity are caused by the magnet member 6.
It can be suppressed to some extent by increasing the processing accuracy of the reinforcing sleeve 7 and the like, but it is still not sufficient, and there is a problem that the manufacturing cost is greatly increased by increasing the processing accuracy.

The present invention has been devised in order to effectively solve such problems, and an object of the present invention is to prevent rattling and eccentricity beforehand and to effectively suppress vibration and noise. It is intended to provide a novel permanent magnet type generator / motor rotor structure that can be used.

[0012]

According to the present invention, a back yoke member is provided around a rotation shaft, and a magnet member is provided around the back yoke member. In the rotor structure of the permanent magnet type generator / motor, which is disposed and its periphery is covered with a cylindrical reinforcing sleeve, a gap is formed between the magnet member and the back yoke, and the magnet member is placed in the gap on the reinforcing sleeve side. And an urging member for pressing the urging member.

That is, since the urging member provided in the gap between the magnet member and the back yoke member keeps the magnet member constantly pressed against the reinforcing sleeve from the time of rotation stop to the time of high-speed rotation, the rotating state is maintained. Irrespective of this, rattling of the magnet member is eliminated, and the generation of noise and vibration can be suppressed reliably.

[0014] In addition, since a gap is positively formed in advance between the magnet member and the back yoke material, it is not necessary to assemble the reinforcing sleeve by press-fitting and fitting. Work is also easier.

[0015] More specifically, as the urging member, a strip-shaped leaf spring which is curved or corrugated in the longitudinal direction of the rotating shaft is used to achieve the above-described functions and effects. It can be achieved easily and inexpensively.

Further, as the back yoke member, a back yoke member having a polygonal cross section in the longitudinal direction of the rotating shaft is used, and the magnet members are arranged on each side surface of the back yoke member. As a result, it is possible not only to realize the original function of the rotor, but also to effectively prevent rattling during high-speed rotation.

Furthermore, by filling a filler between the magnet members, rattling in the circumferential direction can be further effectively suppressed.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a rotor 10 of a permanent magnet generator according to the present invention.

As shown in the figure, the rotor 10 includes a rotating shaft 4 located at an axis, a back yoke member 5 provided around the rotating shaft 4 and having a hexagonal cross section, and a back yoke member 5. Magnet members 6, 6, 6, 6, 6, 6 arranged in a ring around the periphery (side surface) of the member, and a reinforcing sleeve 7 covering the periphery of these magnet members 6, 6, 6, 6, 6, 6 It is mainly composed of

The back yoke member 5 is integrated with the rotary shaft 4 by means of a key and a key groove (not shown). I have.

The magnet member 6 is formed in the shape of a segment, and a material and a structure similar to those of the prior art, for example, a magnetic material such as iron, neodymium, or cobalt is compression-molded at a high temperature and solidified, and instantaneously fired by high-frequency heating. And obtained by a method such as aligning the lines of magnetic force by applying a strong magnetic force,
The inner peripheral surface is formed in a planar shape so as to be parallel to the side surface of the back yoke member 5, and the outer peripheral surface is formed in an arc shape so as to be in close contact with the inner surface of the surrounding reinforcing sleeve 7.

The reinforcing sleeve 7 is formed into a cylindrical shape (sleeve shape) by solidifying a nonmagnetic carbon winding, a metal winding, or a reinforcing fiber such as carbon fiber or ceramic fiber with a resin.
, And functions to hold the magnet members 6, 6,... And to prevent the magnet members 6, 6,.

Then, as described above, the conventional rotor 3
Are arranged so that the magnet members 6, 6... Are in close contact with the back yoke member 5, but in the rotor 10 of the present invention as shown in FIG. A gap s having a certain interval is formed in advance between the magnet members 6, 6,.
The urging members 11, 11, 1 are assigned to s, s, s, s, s, respectively.
1, 11, 11, for example, as shown in FIG. 2, a strip-shaped leaf spring 12 curved in the longitudinal direction of the rotating shaft 4 is fitted.

Therefore, the magnet members 6, 6,... Are always strongly pressed against the reinforcing sleeve 7 by the urging members 11, 11,. Therefore, as shown in FIG. 3, even if the reinforcing sleeve 7 is greatly expanded due to the centrifugal force at the time of high-speed rotation, the state in which the magnet members 6, 6... Therefore, rattling of each of the magnet members 6, 6,... Is eliminated, noise and vibration can be reliably suppressed, and smooth rotational movement can always be ensured.

In addition, since a gap s is positively formed in advance between each of the magnet members 6, 6,... And the back yoke member 5, it is not necessary to press-fit and fit the reinforcing sleeve 7 to assemble the assembly. Processing accuracy is not required, and assembly work is facilitated. For example, the back yoke member 5 is inserted into the reinforcing sleeve 7 and the magnet members 6, 6
Are arranged in the gaps s between the magnet members 6, 6 and the back yoke member 5, and are easily inserted into the biasing member 11.

Further, as in the prior art, even if a filler p such as a resin is filled between the respective magnet members 6, 6,... Since there is no flow into the gap, the generation of noise and vibration due to eccentricity can be surely suppressed.

In the present embodiment, an example is described in which a strip-shaped leaf spring 12 curved in the longitudinal direction of the rotary shaft 4 is used as the urging member 11, but this urging member 11 is always a magnet member. The plate spring 1 is not limited to this as long as it has a function of pressing the sheet spring 6 against the reinforcing sleeve 7 side. For example, as shown in FIG.
3 or a coil spring may be used. That is, when the corrugated leaf spring 13 is used, it takes a little time for fitting, but after fitting, a plurality of portions (bent portions) are required.
As a result, the magnet member 6 can be pressed against the reinforcing sleeve 7 with a uniform force.

Since the power generation (motor) efficiency of the permanent magnet generator (motor) is affected by the strength of the magnetic field of the magnet member 6, as shown in FIG. The shape may be a substantially fan-shaped polygon so that the area can be as large as possible.

[0030]

In summary, according to the present invention, a gap is formed between each magnet member and the back yoke member, and an urging member such as a leaf spring for pressing the magnet member against the reinforcing sleeve is provided in the gap. Therefore, the magnet member is always in close contact with the reinforcing sleeve, and noise and vibration due to rattling, eccentricity, and the like can be reliably suppressed. In addition, since high processing accuracy is not required and assembling is facilitated, excellent effects such as reduction of manufacturing cost can be exhibited.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a rotor structure of a permanent magnet type generator / motor according to the present invention.

FIG. 2 is a perspective view showing an embodiment of an urging member applied to the present invention.

FIG. 3 is a sectional view taken along line AA in FIG.

FIG. 4 is a perspective view showing another embodiment of a biasing member applied to the present invention.

FIG. 5 is a sectional view showing another embodiment of the rotor structure of the permanent magnet type generator / motor according to the present invention.

FIG. 6 is a longitudinal sectional view showing a basic structure of a conventional permanent magnet type generator / motor.

FIG. 7 is a cross-sectional view showing an example of the structure of a conventional rotor.

FIG. 8 is a conceptual diagram showing a state when a conventional rotor rotates at high speed.

FIG. 9 is a conceptual diagram showing a state when a conventional rotor rotates at high speed.

[Explanation of symbols]

 4 Rotating shaft 5 Back yoke material 6 Magnet member 7 Reinforcement sleeve 10 Rotor 11 Biasing member 12 Leaf spring s Gap p Filler

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) H02K 21/14 H02K 21/14 GM

Claims (4)

[Claims] 1. A back yoke member is provided around a rotation axis, and a magnet member is arranged around the back yoke member.
In the rotor structure of the permanent magnet type generator / motor, the periphery of which is covered with a cylindrical reinforcing sleeve, a gap is formed between the magnet member and the back yoke, and in the gap,
A rotor structure for a permanent magnet type generator / motor comprising an urging member for pressing the magnet member against the reinforcing sleeve. 2. The permanent magnet type generator / motor according to claim 1, wherein the biasing member is a strip-shaped leaf spring which is curved or corrugated in the longitudinal direction of the rotating shaft. Rotor structure. 3. The back yoke member is formed in a polygonal cross section in the longitudinal direction of the rotation shaft, and the magnet member is disposed on each side surface of the back yoke member. Item 3. The rotor structure of the permanent magnet type generator / motor according to item 1 or 2. 4. The rotor structure for a permanent magnet type electric motor according to claim 1, wherein a filler is filled between the magnet members.