JPH1094200A - Structure of stator core for capacitor-excited generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To approximate the exterior shape of the entire stator core to a circle and make a magnetic reluctance small by stacking a plurality of core plate aggregates, each of which is made by stacking a plurality of core plates or stacking a plurality of core plates, with cutouts being shiftd in the circumferential direction. SOLUTION: Each of core plates 37 which constitute a stator core has, on its periphery, a pair of cutouts 39 formed, when punched from a steel plate to save material. A plurality of the core plates 37 are stacked with the cutouts 39 being aligned to form a plurality of core plate aggregates 40. The core plate aggregates 40 are stacked with the cutouts 39, being shifted in the circumferental direction to form a stator core. By this method, the shape of the entire stator core can be approximated to a circle, while a magnetic reluctance is lessened and therefore the number of turns of a main coil can be made small, the rate of change in voltage can be reduced, and a large output voltage can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of core plates each having a substantially circular outer periphery and a plurality of core plates provided with linear cutouts, which are laminated on each other to form a substantially cylindrical shape. The present invention relates to improvement of a stator core in a capacitor-excited generator having a stator core.

[0002]

2. Description of the Related Art Conventionally, such a stator core is already known, for example, from Japanese Utility Model Laid-Open Publication No. 59-138373.

[0003]

The reason why a linear notch is provided in a part of the outer periphery of a plurality of core plates constituting a stator core is that each core plate is punched from a steel plate. In order to save material by minimizing the dead space generated between the plates, the stator core disclosed in the above publication has the outer periphery of the stator core because the core plates are laminated together with their notches. , A flat surface is formed. For this reason, in order to avoid that the magnetic resistance becomes relatively large and the magnetic flux generated in the stator core during power generation becomes smaller than that having a completely circular outer peripheral surface, the winding amount is made relatively large.
Therefore, the copper loss of the winding becomes relatively large, and the influence on the output voltage and the voltage fluctuation rate is large, and it is difficult to set a large rated output in consideration of the voltage fluctuation rate.

The present invention has been made in view of such circumstances, and even when a plurality of core plates having a notch in a part of the outer periphery are used, the voltage fluctuation rate is reduced and the output voltage is increased. It is an object of the present invention to provide a stator core structure in a capacitor-excited generator with improved performance.

[0005]

According to the present invention, in order to achieve the above object, a plurality of core plates having a linear notch provided in a part of a substantially circular outer periphery are mutually connected. In a capacitor-excited power generator having a stator core formed by lamination and having a substantially cylindrical shape, a plurality of core plate aggregates each formed by laminating a plurality of core plates each having a cut-out portion, or a plurality of A plurality of core plates are stacked adjacent to each other with the notch portion shifted in the circumferential direction.

According to such a configuration, since the notches are mutually shifted in the circumferential direction, the outer surface shape of the entire stator core can be made closer to a circle, the magnetic resistance can be reduced, and the winding amount can be compared. It is possible to keep the copper loss relatively small, thereby keeping the voltage fluctuation rate relatively small and the output voltage relatively large, and increase the surface area of the stator core to improve the heat dissipation efficiency. it can.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

FIGS. 1 to 4 show one embodiment of the present invention. FIG. 1 is a diagram showing a circuit configuration of a capacitor-excited generator, and FIG. 2 is a longitudinal sectional side view of the capacitor-excited generator. 3 is an exploded perspective view of the stator core, and FIG. 4 is an output voltage characteristic diagram.

[0009] First, in FIG. 1, the rotor 1 of the capacitor-excited generator G is configured in diode type having a pair of field coils 2 _1, 2 _2, both field coil 2 _1, 2 ₂ is the one of the field coil 2 _1, a parallel circuit composed of diodes 3 ₁ and resistor 4 ₁ is connected to the other of the field coil 2 _2, a parallel circuit composed of diodes 3 ₂ and the resistor 4 ₂ connected Is done. The stator 5 has a main coil 6 and an exciting coil 7. Both ends of the main coil 6 are connected to AC output terminals 9 ₁ and 9 ₂ , and both ends of the exciting coil 7 are connected to a capacitor 8. The generator G includes a rectifier circuit 11 composed of a pair of diodes 12 and 13, and rectifies the AC output from the main coil 6 with the rectifier circuit 11 so as to provide a pair of DC output terminals. DC output can be obtained from 10 ₁ and 10 ₂ .

In FIG. 2, a capacitor-excited generator G
The housing 15 has a bottomed cylindrical front bracket 16 and a bottomed cylindrical rear bracket 17, and a plurality of, for example, four fastening bolts 19, 19. The stator core 18 is covered with a cover band 20 between the brackets 16 and 17.

The stator core 1 of the front bracket 16
A plurality of bosses 21 projecting outward at a plurality of locations spaced apart in the circumferential direction are integrally provided on the outer side surface of the end on the side of the eighth side. , Bosses 22... Respectively corresponding to the bosses 21... Of the front bracket 16 are integrally provided so as to project outward. Fastening bolts 19,19
Are respectively inserted into the bosses 22 of the rear bracket 17 and screwed into the bosses 21 of the front bracket 16, respectively.

The stator 5 is formed by winding a main coil 6 and an exciting coil 7 around a stator core 18. The rotor 1 includes a rotating shaft 23, a rotor core 24 fixed to the rotating shaft 23,
Field coils 2 ₁ , 2 ₂ wound around bobbins 25
The rotor 1 is coaxially surrounded by the stator 5.

The front bracket 16 has an end wall 16a on the side opposite to the stator core 18, and has a rotating shaft 23 connected to a power source such as an engine (not shown).
The end wall 16a is rotatably and coaxially penetrated through the central portion of the end wall 16a and protrudes into the housing 15. Rear bracket 1
7 denotes an end opposite to the stator core 18 at an end wall 17a.
One end of a sleeve 27 is rotatably supported via a ball bearing 28 on a bearing 26 provided at the center of the end wall 17a. The rotor core 24 is fitted and fixed to the outer periphery of the intermediate portion of the sleeve 27, and the end of the rotating shaft 23 is coaxially fitted to the other end of the sleeve 27. A coupling bolt 29 inserted into the sleeve 27 from one end thereof is coaxially screwed to the rotating shaft 23, whereby the sleeve 27 is coaxially coupled to the rotating shaft 23.

A support leg 3 is provided below the rear bracket 17.
The support leg 30 is fastened to a fixed support surface 31. A plurality of air inlets 32 for sucking air into the housing 15 are provided on the side wall of the rear bracket 17.

At a position corresponding to the front bracket 16, a cooling fan 33 is mounted on the rotor 1. The cooling fan 33 is made of a metal such as aluminum and iron, or a synthetic resin, and is fastened to a support member 34 fixed to the sleeve 27 by a plurality of screw members 35. The cooling fan 33 rotates together with the rotor 1 to cool the stator 5 and the rotor 1 by air.
Air is introduced into the housing 15 from each of the intake ports 32, 32,..., And a plurality of exhaust ports 36, 36 for exhausting the air with the rotation of the cooling fan 33 are provided on the side wall of the front bracket 16. Can be

Referring also to FIG. 3, in such a capacitor-excited generator G, the stator core 18 of the stator 5 has a plurality of slots 38 on its inner periphery for accommodating the main coil 6 and the exciting coil 7. A plurality of core plates 37, 37,... Formed in a substantially circular shape are laminated on each other. Moreover, each core plate 37, 37 ...
Is formed by punching from a steel plate,
In order to save material by minimizing the dead space generated between the core plates 37, 37... At the time of punching, a part of the outer periphery of each of the core plates 37, 37. Notch 39,3
9 are provided.

For this reason, if the core plates 37, 37,... Are laminated so that the notches 39, 39 are aligned, a flat surface extending along the axial direction is formed on the outer periphery of the stator core. Will be. Therefore, according to the present invention, a plurality of core plates 3 having both notches 39, 39 are combined.
7, 37... Are laminated to form a plurality of core plate aggregates 4.
.. Are respectively formed, and their core plate assemblies 40, 40.
The stator core 18 is formed by laminating the components 9 and 39 in the circumferential direction. Therefore, the stator core 18
Has a large number of recesses 41 on the outer peripheral surface whose length in the axial direction corresponds to the thickness of the core plate assembly 40, but is formed in a cylindrical shape whose outer surface shape is closer to a circle. Become.

Next, the operation of this embodiment will be described. A plurality of core plates 3 having notches 39, 39 are combined.
A plurality of core plate aggregates 40, which are formed by stacking 7, 37.
Are stacked so that the notches 39, 39 are shifted in the circumferential direction between adjacent ones to form the stator core 18, so that the outer surface shape of the entire stator core 18 can be made more circular. Therefore, the stator core 1
8, the winding amount of the main coil 6 can be kept relatively small, whereby the copper loss can be kept relatively small, the voltage fluctuation rate is relatively small, and the output voltage is relatively large. can do.

FIG. 4 shows a comparison between the output of the present invention and the conventional output in terms of the change of the output voltage according to the load. As shown in FIG. 4, a capacitor-excited power generation using the stator core 18 according to the present invention is performed. According to the device G, it is clear that the output voltage can be made larger than that of the conventional device regardless of the load. The output voltage V _R of the present invention when the load is rated is higher than the conventional output voltage V _R ′, and the difference between the maximum output voltage due to a change in load and the output voltage of the rated load is It is clear that the conventional voltage difference ΔV ′ is larger than the voltage difference ΔV of the invention, and therefore that the voltage variation rate of the present invention is also smaller.

Moreover, since the stator core 18 is formed in a cylindrical shape having a plurality of recesses 41 on the outer surface thereof, the area of the outer surface can be further increased, and the efficiency of heat radiation from the stator core 18 is improved. be able to.

As shown in FIG. 2, the stator core 1
When the cover band 8 is covered with the cover band 20, when a flat surface is formed on the outer peripheral surface as in the conventional case, a gap extending in the axial direction of the cover band 18 is generated between the flat surface and the cover band 20. Therefore, it is necessary to set the plate thickness of the cover band 20 to be relatively large so that the cover band 20 is not depressed by the external force in the gap, but according to the present invention, the outer surface of the stator core 18 has a plurality of thicknesses. Although the concave portions 41 are formed, the concave portions 41
41 are relatively small, so that the cover band 2
Most of the zeros come into contact with the outer surface of the stator core 18, and the thickness of the cover band 20 can be set relatively small.

By the way, according to the experiment of the present inventor, it has been confirmed that the core plate assembly 40 is most effective when about 10 core plates 37 are laminated and set to a thickness of about 5 mm. When the thickness of the core plate assembly 40 is 5 mm, chatter may be generated.

In the above embodiment, a plurality of core plate assemblies 4
Are laminated to form the stator core 18, but the core plates 37, 37 are laminated so that the notches 39, 39 are shifted in the circumferential direction between adjacent core plates 37, 37 to form the stator core. You may make it.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

[0025]

As described above, according to the present invention, since the notches are shifted from each other in the circumferential direction, the outer surface shape of the entire stator core can be made closer to a circular shape. To make the winding amount relatively small, the copper loss to be relatively small, the voltage fluctuation rate to be relatively small, and the output voltage to be relatively large. Can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a circuit configuration of a capacitor excitation type generator.

FIG. 2 is a vertical sectional side view of the condenser-excited generator.

FIG. 3 is an exploded perspective view of a stator core.

FIG. 4 is an output voltage characteristic diagram.

[Explanation of symbols]

 18 ... stator core 37 ... core plate 39 ... notch 40 ... core plate assembly G ... capacitor-excited generator

Claims (1)

[Claims] 1. A plurality of core plates (37) provided with a linear notch (39) in a part of a substantially circular outer periphery are laminated on each other to form a substantially cylindrical shape. In a capacitor-excited generator having a stator core (18),
A plurality of core plate aggregates (4) configured by laminating a plurality of core plates (37) together with the notched portions (39).
0) or a stator core structure in a capacitor-excited generator, characterized in that a plurality of core plates (37) are stacked adjacent to each other with the notches (39) shifted in the circumferential direction.