JPH0767275A - Combined permanent magnet rotor - Google Patents

Abstract

PURPOSE:To obtain a rigid and efficient combined permanent magnet rotor by setting the air gap of a rotor comprising a combined permanent magnet with respect to the stator pole and the interval of permanent magnet within a specific range. CONSTITUTION:Nonmagnetic interval members 6 are disposed between the side faces 3, 3 of adjacent permanent magnets 3, 3 spaced apart uniformly in order to prevent flux leakage. The interval member 6 is made by pouring or casting synthetic resin or aluminium after assembling the permanent magnets 3, a tube 2, an outer layer 4, etc., in place. A bulginng part 61, corresponding to a recess 31 in the permanent magnet 3, is formed in the way of the interval member 6. The thickness (d) of the interval member 6 is set in the range of three to seven times of the magnetic gap between the rotor and stator, i.e., the total dimension (t) of the outer layer 4 on the outer peripheral wall of the permanent magnet 3 and the air gap 53. This structure realizes a rigid and efficient combination permanent magnet rotor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combined permanent magnet rotor in which a rotor used in an electric mechanism is formed by combining permanent magnets.

[0002]

2. Description of the Related Art In the case of using a rare earth magnet for a rotor of an electric motor or a generator, its magnetic energy product is large,
An efficient electric mechanism can be obtained, but the strength of the magnet itself is 2
A motor or generator that is not too large at about 00 MPa and rotates at high speed may be damaged by the centrifugal force applied to the magnet.

For this reason, the outer periphery of the rotor is strengthened by winding and solidifying it with a reinforcing material or fitting a sleeve of the reinforcing material.

[0004]

As described above, a rotor provided with a reinforcing material on the outer periphery thereof can withstand centrifugal force, but if the reinforcing material layer is made large, the magnetic pole of the corresponding stator is The increased distance increases the magnetic resistance and reduces the efficiency of the electric mechanism.

Further, when the rotor is formed with three or more poles, magnetic leakage occurs between the magnetic poles, so that it is necessary to dispose a spacer between them. If the spacer is thin, the leakage flux is reduced. There is a problem that

The present invention solves such a problem, and an object thereof is to appropriately set a gap between a stator magnetic pole and a gap between the permanent magnets in a rotor using a combined permanent magnet. The present invention seeks to provide a strong and efficient combination permanent magnet rotor.

[0007]

In order to achieve the above object, according to the present invention, a permanent magnet having a fan-shaped cross section is combined as a rotor of an electric mechanism that rotates at a high speed, and the outer peripheral wall of the permanent magnet serves as a reinforcing outer layer. In the combined permanent magnet rotor covered with a spacer, a spacer made of a non-magnetic material is arranged between the adjacent surfaces of the permanent magnet, and the thickness of the spacer is three times the magnetic gap between the rotor and the stator. A combined permanent magnet rotor set between 1 and 7 times is provided.

[0008]

Since the thickness of the spacer and the magnetic gap are set to the optimum values experimentally, a highly efficient electric mechanism can be obtained.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of an embodiment of a combined permanent magnet rotor according to the present invention. In FIG. 1, reference numeral 1 is a rotating shaft, and an inner cylinder 2 made of a ferromagnetic material is fitted on the outer periphery of the rotating shaft. .

Reference numeral 3 denotes a permanent magnet which serves as a magnetic pole of the rotor, and is formed in a fan shape divided according to the number of magnetic poles. In this embodiment, four permanent magnets containing a rare earth element and having a large magnetic energy product are used. The magnetization is performed in the radial direction, and the inner cylinder 2 constitutes an inner magnetic path.

An outer layer 4 made of a non-magnetic material is attached to the outer peripheral wall of the permanent magnet 3 to withstand the centrifugal force applied to the permanent magnet 3 at the time of high rotation. For example, a high strength titanium plate or , Layers of high strength carbon fiber wound and consolidated.

Reference numeral 5 denotes a stator corresponding to the rotor, which is a yaw.
A plurality of convex poles 52 are provided from the black portion 51 toward the inside,
A predetermined gap 53 is formed between the permanent magnet 3 and the outer layer 4 on the outer peripheral wall.
Is provided so as not to come into contact with the salient pole 52 even when the rotor or the outer layer 4 expands at high temperature due to vibration during high-speed rotation.

Numeral 6 is a spacing member made of a non-magnetic material, which is disposed between the side surfaces of the adjacent permanent magnets and uniformly isolates both magnets to prevent leakage of magnetic flux. A synthetic resin material or aluminum is used. After assembling the permanent magnet 3, the cylinder 2, the outer layer 4 and the like at appropriate positions, they are molded by pouring or casting. Further, a bulge portion 61 is formed in the middle of the spacing member 6 and corresponds to the concave portion 31 of the permanent magnet 3,
After the assembly, the permanent magnet 3 and the spacing member 6 are stably fixed, and a strong rotor 5 is obtained.

FIG. 2 shows the magnetic gap between the rotor and the stator,
That is, the total dimension of the outer layer 4 and the void 53 is t, the thickness dimension of the spacing member 6 is d, and the ratio and the efficiency of the electric mechanism are obtained by experiments. In the figure, the value of d is 3 t. The efficiency of 70% or more is obtained between 10 to 10t. Therefore, in the present embodiment, the thickness of the spacing member 6 is set so that d is set between 3t and 10t.

Next, the operation of the present embodiment thus constructed will be described. Although the rotor is driven at high speed and a strong centrifugal force acts on each permanent magnet 3, the outer circumference of the combined permanent magnets 3 is increased. The wall is covered with the outer layer 4 of a high-strength material, and the spacing member 6 having the bulge portion 61 that engages with the convex portion 31 is provided between the adjacent permanent magnets 3. Can withstand force and escape damage.

Further, since the thickness of the spacing member 6 is set to a value between 3 times and 10 times the magnetic gap, which is a dimension at which an efficiency of 70% or more can be obtained by an experiment, the electric mechanism is highly efficient. Will operate.

Although the present invention has been described with reference to the above embodiments, various modifications can be made within the scope of the gist of the present invention, and these modifications are not excluded from the scope of the present invention.

[0018]

According to the present invention as in the above embodiments,
A permanent magnet with a fan-shaped cross section is combined, the outer peripheral wall is covered with a high-strength outer layer, and a spacer having a bulge that engages with the recess of the permanent magnet is provided, so it can withstand centrifugal force during high-speed rotation. In addition, since the thickness of the spacer is formed to have an appropriate size with high efficiency, there is an advantage that the efficiency is high during operation as a motor or a generator.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a curve diagram showing the relationship between the size of the spacer and the efficiency of the electric mechanism in the present embodiment.

[Explanation of symbols]

 3 ... Permanent magnet 4 ... Outer layer 5 ... Stator 6 ... Spacing member 31 ... Recessed portion 53 ... Void 61 ... Swelling portion

Claims (3)

[Claims] 1. A combined permanent magnet rotor in which fan-shaped permanent magnets are combined as a rotor of an electric mechanism that rotates at a high speed, and an outer peripheral wall of the combined permanent magnet rotor is covered with a reinforcing outer layer. A combination permanent magnet rotation characterized in that a spacing member made of a non-magnetic material is arranged between the surfaces, and the thickness of the spacing member is set to 3 to 7 times the magnetic gap between the rotor and the stator. Child. 2. The combination permanent magnet rotation according to claim 1, wherein the spacing member is made of a synthetic resin material or an aluminum material, and the spacing member is molded after the permanent magnets are assembled. Child. 3. The combined permanent magnet rotor according to claim 2, wherein a concave portion is formed on an adjacent surface of said permanent magnet, and a convex portion corresponding to the concave portion is formed when the spacer is formed. .