JPH0533670U - Permanent magnet generator - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a permanent magnet generator whose output characteristics can be easily adjusted without adjusting the outer diameter of the rotor or the inner diameter of the stator. [Structure] The outer diameter of the rotor and the inner diameter of the stator are similar to each other in a tapered shape, and the stator or the rotor is provided so as to be movable in the axial direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a permanent magnet generator used in a rotary electric machine, and more particularly to a permanent magnet generator capable of increasing / decreasing a gap between a rotor and a stator and finely adjusting an output.

[0002]

[Prior Art]

 A conventional permanent magnet generator usually has the configuration shown in FIG. FIG. 3 shows an example of a structure in which a permanent magnet is used on the rotor side, which is composed of a rotor 22 provided on a shaft 21 and a stator 25. The rotor 22 has two yokes 23 opposed to the shaft 21. The permanent magnet 24 is fixed between the yokes 23, 23. The stator 25 is fixedly provided to the frame 27 with a constant gap 26 parallel to the axial direction on the outer circumference of the rotor 22, and the shaft 21 is rotatably supported by a bearing 29 of a bracket 28. There is. In such a permanent magnet generator, the output characteristic is determined by the gap 26 between the rotor 22 and the stator 25.

[0003]

[Problems to be solved by the device]

 Usually, permanent magnet generators are often required to have accurate output characteristics, and the error tolerance is also severe. However, in reality, since there are variations in the characteristics of the permanent magnet 24, it is difficult to manufacture a generator that obtains the characteristics calculated. Therefore, conventionally, an output characteristic is adjusted by actually carrying out an assembly rotational characteristic test and processing the outer diameter of the rotor 22 or the inner diameter of the stator 25 according to the result. For this adjustment, it is necessary to disassemble and adjust and process after the rotation characteristic test, and then it is necessary to carry out final assembly and reassembling the rotation characteristic test for final confirmation. In addition, there is a problem that it takes a long time, and further, there is a risk that it will be unusable and remanufactured in the worst case due to excessive processing. The present invention solves the above-mentioned drawbacks in view of such a point and changes the relative gap by axially moving and adjusting the stator or the rotor, so that the output can be easily performed without the conventional adjustment processing. The purpose is to provide a permanent magnet generator whose characteristics can be adjusted.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention has a configuration in which the outer diameter of the rotor and the inner diameter of the stator are tapered similarly to each other, and the stator or the rotor is provided so as to be movable in the axial direction.

[0005]

[Action]

 The outer diameter of the rotor and the inner diameter of the stator are similar to each other in a tapered shape, and the stator or rotor is provided so as to be movable in the axial direction. Therefore, by moving the stator or the rotor in the axial direction, the rotor and the stator can be moved. The relative gap between them can be changed and the output characteristics can be adjusted.

[0006]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. Two yokes 3 are attached to the shaft 1 so as to face each other, and a permanent magnet 4 is fixed between the yokes 3 to form a rotor 2. The shaft 1 of the rotor 2 is rotatably supported by a bearing 9 provided on a bracket 8. The outer circumference of the rotor 2 is tapered, and a tapered stator 5 having an inner diameter similar to the taper of the rotor 2 is provided on the outer circumference of the rotor 2 with a fixed gap 6 with the rotor 2. There is.

The stator 5 is provided on the frame 7 so as to be axially movable while being constrained in the rotational direction by a key or the like. For example, a guide groove (not shown) is provided in the frame 7 along the axial direction, and the stator 5 is movably provided along the guide groove. A push plate 10 is fixed to one side surface of the stator 5, a screw hole is screwed into the push plate 10, and a plurality of adjusting bolts 11 provided on the bracket 8 are attached to the screw hole of the push plate 10. It is screwed in, and the axial position of the stator 5 can be adjusted by the adjusting bolt 11. A lock bolt 12 for fixing the stator 5 is provided on the outer peripheral surface of the frame 7 so that the stator 5 can be fixed after the position adjustment.

However, the outer diameter of the rotor 2 and the inner diameter of the stator 5 are similar to each other in a tapered shape, and the stator 5 is provided so as to be movable in the axial direction, so that the lock bolt 12 is loosened. In this state, by rotating the adjusting bolt 11, the stator 5 can be moved in the axial direction, whereby the relative gap 6 between the rotor 2 and the stator 5 can be changed to adjust the output characteristic. After that, the lock bolt 12 is tightened at a predetermined output characteristic to fix the stator 5.

FIG. 2 is a schematic explanatory view showing a modified example of the present invention, which is a case of an overhung permanent magnet generator. In the figure, 2 is a rotor, and 5 is a stator, and the outer diameter of the rotor 2 and the inner diameter of the stator 5 are tapered similarly to each other, and the stator 5 is attached so as to be movable and adjustable in the axial direction. The adjustment can be made at 11. In the embodiment, the case where the stator is moved and adjusted has been described, but the rotor or both may be moved and adjusted.

[0010]

[Effect of the device]

 As described above, according to the present invention, the outer diameter of the rotor and the inner diameter of the stator are tapered so that the stator or the rotor can be moved and adjusted in the axial direction. Therefore, the stator or the rotor can be adjusted in the axial direction. By doing so, it is possible to increase or decrease the gap, and it is not necessary to adjust the outer diameter of the rotor or the inner diameter of the stator, which greatly simplifies the work of adjusting the output characteristics and makes the manufacturing extremely easy. Is.

Further, since it is not necessary to adjust the outer diameter of the rotor or the inner diameter of the stator, there is also eliminated the risk of troubles due to excessive shaving that may occur during adjustment processing. Further, the characteristics of the permanent magnet have a large temperature dependency, and the output characteristics may change depending on the ambient temperature. Even in such a case, the adjustment is possible and highly practical. It can be easily inferred that the same effect as described above such as fine adjustment of the excitation voltage can be obtained by using the present invention in another rotating electric machine such as a generator.

[Brief description of drawings]

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

FIG. 2 is a schematic explanatory view showing a modified example of the present invention.

FIG. 3 is a partially sectional front view showing a conventional example.

[Explanation of symbols] 1 shaft 2 rotor 3 yoke 4 permanent magnet 5 stator 7 frame 8 bracket 9 bearing 10 push plate 11 adjusting bolt

Claims (1)

[Scope of utility model registration request] 1. A permanent magnet generator characterized in that an outer diameter of a rotor and an inner diameter of a stator are similar to each other in a tapered shape, and the stator or the rotor is axially movable and adjustable.