JPH06319238A - Rotor for permanent magnet generator - Google Patents

Abstract

PURPOSE:To constitute rotors having different outside dimensions by using the same tabular permanent magnets, and to prevent the breakdown of the permanent magnets. CONSTITUTION:The title rotor has a plurality of tabular permanent magnets 2 mounted on the outer circumference of a shaft 1 in the circumferential direction and laminated magnetic plates 5 being installed onto the permanent magnets 2 and constituting magnetic poles, and non-magnetic members 3 fixing the laminated magnetic plates 5 are fastened onto the outer circumference of the shaft 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor for a permanent magnet generator made by using a flat permanent magnet.

[0002]

2. Description of the Related Art FIG. 8 is a sectional view showing a rotor of a conventional permanent magnet generator disclosed in, for example, Japanese Utility Model Laid-Open No. 60-48345, in which 1 is a rotary shaft and 2 is this rotary shaft. Circular arc-shaped permanent magnets 3 provided at a predetermined interval in the circumferential direction on the outer circumference of 1 are joined to both ends of the permanent magnets 2 in the circumferential direction, and pressed against the rotary shaft 1 side. The holding plates 4 are tightening bolts for fixing the holding plate 3 to the rotary shaft 1.

Next, the operation will be described. First, the rotor 1 is rotatably supported in an armature core having an armature winding in a slot, that is, in a stator. Therefore, the rotation of the rotor 1 receives the magnetic flux 6 generated by the permanent magnet 2 as a magnetic pole, the armature winding induces a voltage, and the voltage is output to the outside. That is, electric power is generated by the permanent magnet generator.

In this case, the magnetic flux 6 forms a closed loop indicated by a dotted line according to the magnetism of the permanent magnet 2. Further, the characteristics of the generator are largely controlled by the pole arc ratio, which is the ratio of the pole surface pole arc to the pole arc per pole.

[0005]

Since the rotor of the conventional permanent magnet generator is constructed as described above, an arc-shaped permanent magnet suitable for rotors having different outer diameters is used. 2 must be prepared, and since the permanent magnet 2 is exposed on the surface of the rotor, a jig or the like collides with the rotor during the assembly work and the permanent magnet 2 is destroyed. was there.

Further, the rotor of the conventional permanent magnet generator is not provided with any means for obtaining a braking effect against load fluctuations and the like, and there is a problem in that there is a problem in stability during parallel operation. there were.

The invention of claim 1 has been made to solve the above problems, and the laminated magnetic plate and the non-magnetic member are exchanged even when a rotor having a different outer diameter is required. It is an object of the present invention to obtain a rotor of a permanent magnet generator that can use the same plate-shaped permanent magnets by simply doing so and can prevent damage to the permanent magnets due to collision of a jig or the like.

Further, in addition to the above-mentioned object, the invention of claim 2 provides a rotor of a permanent magnet generator in which a braking effect against a load variation is sufficiently obtained by a braking winding, which can be realized at low cost. Aim to get.

Further, according to the third aspect of the present invention, when the laminated magnetic plates are brought into contact with the permanent magnets as the rotor side magnetic poles, the magnetic flux distribution between the armature core and the armature core is approximated to a sine wave. The object is to obtain a rotor of a permanent magnet generator having a good voltage waveform.

[0010]

A rotor of a magneto-generator according to the invention of claim 1 comprises a plurality of plate-shaped permanent magnets circumferentially attached to the outer periphery of a rotary shaft, and a permanent magnet on the permanent magnets. A non-magnetic member fixed to the outer circumference of the rotary shaft, the non-magnetic member being fixed to the laminated magnetic plate, the non-magnetic member being fixed to the laminated magnetic plate alternately with the laminated magnetic plate to form a magnetic pole. It is a thing.

The rotor of the permanent magnet generator according to the second aspect of the present invention includes a plurality of plate-shaped permanent magnets mounted in the outer peripheral direction of the rotor, and magnetic poles mounted on the permanent magnets. A plurality of laminated magnetic plates, which are arranged alternately in the circumferential direction of the laminated magnetic plates and fixed to the laminated magnetic plates to fix the laminated magnetic plates, and which penetrate through the outer peripheral grooves of the laminated magnetic plates in the axial direction. The conductive bar is provided, and one end and the other end of the bar are independently coupled to the short-circuit ring.

Further, a rotor of a permanent magnet generator according to a third aspect of the present invention includes a plurality of plate-shaped permanent magnets circumferentially mounted on the outer periphery of a rotary shaft, and the permanent magnets mounted on the permanent magnets. And a non-magnetic member that is alternately arranged with the laminated magnetic plates in the circumferential direction to fix the laminated magnetic plates. In addition, an inclined portion is provided so that the thickness gradually decreases.

[0013]

In the laminated magnetic plate according to the invention of claim 1, a permanent magnet having a shape common to small and large sized rotors can be obtained by simply changing the shape and size according to the outer diameter of the rotor. Made available and covered with this permanent magnet from the outside,
It functions to prevent cracks caused by the collision of jigs.

The plurality of bars in the invention of claim 2 are connected between a pair of short-circuit rings, and the current generated by the fluctuation of the interlinkage magnetic flux is flowed to these bars and the short-circuit ring as a control circuit current, It functions to suppress the fluctuation of the rotation speed due to the load fluctuation, and thereby the braking effect is obtained on the rotor.

Further, the inclined portion in the invention of claim 3 is formed by gradually thinning the outer end portion of the laminated magnetic plate in the circumferential direction, and the magnetic flux distribution can be made a sine wave in relation to the armature. Close to each other to reduce the voltage waveform wrapping rate induced in the armature winding.

[0016]

【Example】

Example 1. An embodiment of the invention of claim 1 will be described below with reference to the drawings. In FIG. 1, 1 is a rotary shaft, 2 is a plurality of plate-shaped permanent magnets mounted in the circumferential direction of the rotary shaft 1, and 5 is a laminated magnetic plate mounted on the permanent magnet 2 to form magnetic poles. For example, as shown in FIG. 2, a laminated structure of a plurality of thin magnetic plates is formed. Reference numeral 3 is a non-magnetic member, which is attached to the rotary shaft 1 with a tightening bolt 4 by pressing the end portion of the laminated magnetic plate 5 from the outer periphery.

Next, the operation will be described. The rotor is rotatably supported in an armature core having an armature winding in a slot, that is, in a stator. Therefore, by the rotation of the rotor, the magnetic flux 6 generated by the permanent magnet 2 as a magnetic pole is received via the laminated magnetic plate 5, the armature winding induces a voltage, and this is output to the outside. That is,
Electric power is generated by the permanent magnet generator.

In this case, the magnetic flux 6 forms a closed loop indicated by a dotted line according to the magnetism of the permanent magnet 2. Further, the characteristics of the generator are largely controlled by the pole arc ratio, which is the ratio of the pole surface pole arc to the pole arc per pole.

In such a rotor structure, when it is necessary to increase or decrease the outer diameter of the rotor, the shape and size of the permanent magnet 2 may be the same or may be the same. , Laminated magnetic plate 5 and non-magnetic member 3
You only have to change the shape and size.

In this case, the generator characteristics can be arbitrarily set by appropriately selecting the polar arc ratio. Further, the laminated magnetic plate 5 protects the fragile permanent magnets on the inner side thereof from collision with other articles, and also functions to reduce eddy current loss and hysteresis loss.

Example 2. FIG. 3 shows an embodiment of the invention of claim 2. This is because a plurality of outer circumferential grooves 5b as shown in FIG. It is provided so as to penetrate the bar 7.
Further, as shown in FIG. 5, short-circuit rings 8 and 9 are brought into contact with both end faces of each laminated magnetic plate 5a and the non-magnetic member 3, and these are fixed to both ends of each bar 7. These short-circuit rings 8 and 9 function as a braking winding, and due to the current generated in the braking winding due to fluctuations in the interlinkage magnetic flux due to load fluctuations,
Braking torque is generated to stabilize the rotation of the rotor.

In this embodiment, the short-circuit rings 8 and 9 are integrated as shown in FIG. 5, but as shown in FIG. 6, the short-circuit rings 8a and 9a having the divided structure are assembled to form a ring shape. By doing so, there is an advantage that the fixing work of the bar 7 and the short-circuit rings 8a and 9a can be performed at a place other than the rotating shaft.

Further, in FIG. 5, the tightening bolt 10
By utilizing the fact that the contact surface pressure between each short-circuit ring 8a, 9a and the non-magnetic member 3a is increased by tightening, the non-magnetic member 3a can be used as a d-axis damper. The function of is also added, and a better braking effect can be obtained.

Example 3. FIG. 7 shows an embodiment of the invention of claim 3. This is an inclined portion 11 in which the outer end portion in the circumferential direction of the laminated magnetic plate 5b is inclined so as to be gradually thinned. Looking at the voltage induced in the armature conductor, if the outer end of the rotor is uniform with respect to the armature surface,
Since the magnetic flux distribution has a trapezoidal waveform, the waveform is distorted more than the sine wave. That is, the rate of the voltage waveform increases. Therefore, by providing the inclined portion 11 at the outer end portion of the laminated magnetic plate 5b as described above, the magnetic flux distribution can be approximated to a sine wave, and the voltage waveform wrapping rate can be reduced.

[0025]

As described above, according to the invention of claim 1, the non-magnetic member for fixing the laminated magnetic plates constituting the magnetic poles is provided on the plate-shaped permanent magnet.
Regardless of the outer diameter of the rotor, you can easily configure the magnetic poles by using a common permanent magnet, and prevent the fragile permanent magnet from being damaged by touching an object. There is an effect that the one that can suppress the hysteresis loss can be obtained.

Further, according to the invention of claim 2, a plurality of bars are axially penetrated into the outer peripheral groove of the laminated magnetic plate, and both ends of these bars are connected by a short-circuit ring. The braking winding current due to load fluctuations etc. is passed through these bars and the short-circuit ring to generate braking torque,
There is an effect that it is possible to obtain the one that can give the braking effect to the rotor by suppressing the fluctuation of the rotation speed due to the load fluctuation.

Further, according to the invention of claim 3, since the inclined portion is formed at the outer end in the circumferential direction of the laminated magnetic plate, the relative relationship with the magnetic circuit of the armature is
There is an effect that the waveform distortion of the magnetic flux distribution can be corrected and the waveform wrapping rate can be suppressed.

[Brief description of drawings]

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

FIG. 2 is a perspective view showing a part of the laminated magnetic plate in FIG.

FIG. 3 is a sectional view showing a rotor of a permanent magnet generator according to an embodiment of the present invention.

FIG. 4 is a perspective view showing a part of the laminated magnetic plate in FIG.

5 is a perspective view showing the whole rotor in FIG. 3. FIG.

6 is an overall perspective view showing another embodiment of the rotor in FIG.

FIG. 7 is a sectional view showing a rotor of a permanent magnet generator according to an embodiment of the present invention.

FIG. 8 is a sectional view showing a rotor of a conventional permanent magnet generator.

[Explanation of symbols]

 1 rotating shaft 2 permanent magnet 3 non-magnetic member 5 laminated magnetic plate 7 bar 8 short-circuit ring 11 inclined part

Claims (3)

[Claims] 1. A plurality of plate-shaped permanent magnets circumferentially attached to the outer periphery of a rotary shaft, a laminated magnetic plate attached to the permanent magnets to form magnetic poles, and the laminated magnetic plates alternately. A rotor for a permanent magnet generator, which is arranged in a circumferential direction and includes a non-magnetic member that fixes the laminated magnetic plate to a rotation shaft. 2. A plurality of plate-shaped permanent magnets circumferentially mounted on the outer periphery of a rotary shaft, a laminated magnetic plate mounted on the permanent magnets to form magnetic poles, and the laminated magnetic plates alternately. A non-magnetic member arranged in the circumferential direction to fix the laminated magnetic plate to a rotating shaft, a plurality of conductive bars axially penetrating the outer peripheral groove of the laminated magnetic plate, one end of the bar and A rotor for a permanent magnet generator having a short-circuit ring, the other ends of which are independently coupled. 3. A plurality of plate-shaped permanent magnets circumferentially mounted on the outer periphery of a rotary shaft, a laminated magnetic plate mounted on the permanent magnets to form magnetic poles, and the laminated magnetic plates alternately. A non-magnetic member arranged in the circumferential direction for fixing the laminated magnetic plate to the rotating shaft; and an inclined portion formed so as to be gradually thinned at the outer circumferential end of the laminated magnetic plate. Rotor of a permanent magnet generator.