JPH0799920B2 - Brushless generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention uses a brushless generator, in particular, a stator in which windings are concentratedly wound and the magnetic path of which is symmetrical.
The present invention relates to a brushless generator capable of improving electromechanical performance.

[Conventional technology]

As a structure of a small generator in which the main winding is concentratedly wound on the stator, the structures shown in FIGS. 5 and 6 are known.

In FIG. 5, the stator 51 is symmetrically divided into two parts at the central portion thereof, and the positioning pins 52 are press-fitted on the mounting side so that the stator cores 51-1 and 51-1
-2 and 2 are integrated. That stator
A main winding 53 of concentrated winding is wound around a central portion where 51 is divided into two.

In FIG. 6, the stator 61 is integrally formed, and the magnetic pole 62 provided inside the stator 61 is an exciter winding.
Slots 64 for accommodating 63 are provided in the respective shapes. A main winding 65 of concentrated winding is wound around the magnetic pole 62.

[Problems to be Solved by the Invention]

In the conventional small-sized generator having the structure shown in FIG. 5, it is not possible to make it a brushless structure from the electrical viewpoint, and the load characteristics shown by the broken line in FIG. 7 are shown. ， The voltage fluctuation rate was bad. From a mechanical point of view, the claws 51-1 are attached to the stator cores 51-1 and 51-2.
Because of the structure in which a and 51-2a are provided, an electromagnetic force pulsating at the power generation frequency acts between the rotor 54 and the rotor 54, which causes vibration and noise.・ There was a drawback that the gap had to be made large and therefore had a negative effect on electrical performance.

Further, in the conventional small-sized generator having the structure shown in FIG. 6, it is possible to obtain a brushless structure generator by using the exciter winding 63, but the rotor is generated by the magnetic flux Φ _M accompanying the output load current. In order to magnetize 66 to the maximum extent, the air gap of the broken line A portion in the figure is made more uneven than the air gap of the broken line B portion, and the concave portion 64a is provided on one side of the slot 64 so that the magnetic flux Φ _M A structure devised so as to flow as shown by the arrow in the figure is adopted. However, the cross-sectional area of the magnetic path becomes narrower, the magnetic path becomes longer, the magnetic resistance increases, and there is a drawback that the voltage compensation is not sufficient. Since the slot 64 is provided in the magnetic pole 62, which has the highest magnetic flux density and is most important for waveform formation, the output waveform is distorted and the output is reduced.

The present invention is intended to solve the above-mentioned drawbacks, and a brushless generator capable of a brushless structure, having mechanical strength and easy assembly, and having excellent electrical characteristics such as a voltage fluctuation rate is provided. It is intended to be provided.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the brushless generator of the present invention is a frame in which magnetic pole portions are formed inside, the outer shape is a substantially mouth shape, and the four corners of the mouth shape are processed into a circular shape. A stator having an R shape fitted into a groove and having a structure divided at the corners of the V-shape, and a Mehnye winding and a phase advancing capacitor respectively wound around a yoke portion of the stator. At both ends of the exciter winding, the main pole rotating between the magnetic poles of the stator, and the space angle with respect to the main pole.
A rotor with auxiliary poles provided at a 90 ° offset,
A main field winding wound around the main pole of the rotor and an auxiliary field winding wound around the auxiliary pole, and two adjacent main poles and auxiliary poles were connected so as to have the same magnetic pole. A rectifying diode connected between the main field winding and the other end of the auxiliary field winding is provided. An embodiment of the present invention will be described below with reference to the drawings.

〔Example〕

FIG. 1 is a block diagram of a brushless generator according to the present invention, FIG. 2 is an exploded view of a stator core, FIG. 3 is a circuit diagram of the brushless generator according to the present invention, and FIG. Fig. 3 shows a flow diagram of magnetic flux of the brushless generator according to the invention.

In Fig. 1 and Fig. 2, the stator 1 has a generally square V shape, and two symmetrical stator cores 1-1 and 1-2 are laminated respectively, and a corner where the cross-sectional area of the magnetic path can be relatively large. The concave portions 1-1a, 1-2a for engagement and the convex portions 1-1b, 1-2b for engagement are formed in the portion, and the concave and convex portions for engagement are fitted together by a press-fitting method to form an integrated structure. Has become. Stator 1
The four corners of the stator 1 have a shape having a radius R that is the same as the R diameter of the fitting circular frame groove formed in the other frame to which the stator 1 is to be attached.
A structure is adopted in which the mechanical strength of the stator 1 is reinforced by fitting it into the fitting circular frame groove of the frame.

Inside the stator 1, a magnetic pole portion 5 is provided at a position facing the main pole 3 or the auxiliary pole 4 of the rotor 2. First
In the stator 1 shown in FIG. 2 and FIG. 2, the concave pole piece 5
However, the magnetic pole portion 5 having a convex pole shape may be formed.

A concentrated winding main winding 7 and an exciter winding 8 are wound around the yoke portion 6 of the stator 1. Both ends of the exciter winding 8 are short-circuited by a phase advancing capacitor 9 as shown in FIG.

On the other hand, as described above, the rotor 2 is provided with the auxiliary pole 4 at a position deviated by about 90 ° in space angle in addition to the main pole 3, and the main pole 3 and the auxiliary pole 4 have main field windings 10 and Auxiliary field winding 11
Are wound so as to have the polarity shown in FIG. 1 with respect to the direction of rotation indicated by the arrow. Circuitally, the third
As shown in the figure, the start end of the main field winding 10 and the end of the auxiliary field winding 11 are connected, and between the end of the main field winding 10 and the start end of the auxiliary field winding 11. The rectifying diodes 12 and 13 are connected to each.

Therefore, a so-called Nonaka generator is constructed and becomes a brushless generator. In FIG. 3, 14 and 15 are resistors, which are connected to protect the rectifying diodes 12 and 13.

The operation of the brushless generator according to the present invention shown in FIGS. 1 and 3 will be briefly described as follows. That is, an induced electromotive force is generated in the main winding 7 and the exciter winding 8 due to the residual magnetism of the rotor 2. Since the exciter winding 8 is short-circuited by the phase advancing capacitor 9, a phase advancing current flows in the exciter winding 8, and the magnetic flux generated by the phase advancing current and the main field winding 10 and the auxiliary of the rotor 2 are generated. Interlinks with the field winding 11. Therefore, an induced electromotive force is generated in the main field winding 10 and the auxiliary field winding 11, and the field current starts to flow. As a result, the field magnetic flux of the rotor 2 increases, and the same process is repeated thereafter, and a predetermined voltage is generated in the main winding 7.

When a load current flows through the main winding 7, the magnetic flux Φ _M of the main pole 3 decreases due to the armature reaction, but the auxiliary current 4 is magnetized by the load current and an electromotive force is induced in the auxiliary field winding 11. As a result, it works to compensate for the decrease in the field magnetic flux due to the armature reaction. This state is shown in FIG.
As shown in (I), the rotor 2 rotates clockwise and shows a half-rotation magnetic flux flow. In the figure, Φ _fM represents the magnetic flux created by the main field winding 10, and similarly, Φ _fs is the auxiliary field winding 11, Φ _m is the main winding 7, and Φ _eX is the exciter winding 8. It represents the magnetic flux that is created.

In this way, the electromotive force is induced in the auxiliary field winding 11 according to the load current, and the magnetic flux Φ _fs acts in the direction of increasing the field magnetic flux, so that the series winding effect can be expected sufficiently and its load characteristic The characteristics shown by the solid line in FIG. 7 are obtained, and the electrical performance such as the voltage fluctuation rate is improved.

〔The invention's effect〕

As described above, according to the present invention, it is possible to realize a brushless generator mechanically and electrically improved in strength and performance. Specifically, from an electrical point of view, the load characteristics are improved, the voltage fluctuation rate is improved, and the magnetic resistance is small because there are no slots in the magnetic poles. As a result, the magnetic flux can be effectively used and the stator can be downsized. In addition, the output waveform is free of slot ripples, etc., and the waveform can be improved.

From a mechanical point of view, since it has an R outer shape that fits the four corners of the stator into the circular frame grooves of the mounting counterpart, it can be easily positioned with respect to the counterpart frame that holds the stator and rotor. The pins are not needed, and the stator itself is solid. Since the magnetic path of the stator is symmetric and there are no claws, distortion due to electromagnetic force is small, vibration and noise are reduced, and the air gap with the rotor can be set evenly small.
Low cost and weight reduction are possible.

[Brief description of drawings]

FIG. 1 is a block diagram of a brushless generator according to the present invention, FIG. 2 is an exploded view of a stator core, FIG. 3 is a circuit diagram of the brushless generator according to the present invention, and FIG. Explanatory drawing of magnetic flux of brushless generator according to the invention, fifth
6 and 6 are configuration diagrams of a conventional generator in which main windings are wound in concentrated windings, and FIG. 7 is a load characteristic curve diagram. In the figure, 1 is a stator, 2 is a rotor, 3 is a main pole, 4 is an auxiliary pole, 5 is a magnetic pole part, 6 is a yoke part, 7 is a main winding, 8 is an exciter winding, and 9 is a phase advancing capacitor. , 10 is the main field winding, 11 is the auxiliary field winding, 1
2 and 13 represent rectifying diodes.

Claims (1)

[Claims] 1. A magnetic pole portion is formed inside, the outer shape is a substantially V-shape, and the four corners of the V-shape are R-shaped to be fitted in a circular frame groove. And a stator having a structure divided at the corners of the mouth shape, an main winding wound around each yoke portion of the stator, and an exciter winding having both ends shorted by a phase advancing capacitor, A rotor having a main pole rotating between magnetic poles of the stator, an auxiliary pole provided at a position deviated from the main pole by a spatial angle of about 90 °, and a main field wound around the main pole of the rotor. The auxiliary field winding wound around the magnetic winding and the auxiliary pole, and the main field winding and the auxiliary field winding connected so that two adjacent main poles and auxiliary poles have the same magnetic pole. And a rectifying diode respectively connected between the other end and the other end of the brushless generator. .