JPH0528064B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a brushless generator, in particular, a stator with, for example, a six-pole single-phase excitation winding, and a rotor with, for example, six-pole salient poles. None, for example, a field winding that generates a two-pole magnetic field for the main power generation winding,
The six-pole single-phase excitation winding and the magnetically coupled field auxiliary winding are wound around a six-pole salient field core, and the electromotive force induced in the field auxiliary winding is used. This relates to a brushless generator that is made into a self-excited synchronous generator by passing a field current through it.

(Prior art) Conventionally, as a brushless single-phase generator with a simple structure and excellent characteristics, an alternating current voltage induced in a field winding is rectified by a diode to generate a field current for the field winding. A so-called Nonaka type generator is known. A brushless two-pole three-phase generator as shown in FIG. 3 was also developed, which applied the basic principle of the Nonaka type generator. In addition, in Figure 3,
1 is a stator, 2 is a rotor, 3 is a two-pole three-phase main power generation winding, 4 is a single-phase four-pole excitation winding, 5 is a DC power supply, and 6-1a to 6-1d are field cores. , 6-2
A to 6-2d represent salient poles, 7a to 7d represent field windings, and 8 represents a diode.

In the example shown in FIG. 3, the four-pole field cores 6-1a to 6-1 provided in the rotor 2
Field windings 7a to 7d are wound around d.
A diode 8 is connected to each of the field windings 7a to 7d, and salient poles 6-2a to 6-
The field cores 6-1a to 6-1d are magnetized by sequentially generating S, S, N, and N magnetic poles at 2d. That is, in the example shown in FIG. 3, when the rotor 2 rotates, the static magnetic field of the excitation winding 4 causes a field current to flow in the direction of the arrow shown in the field windings 7a to 7d, and the field current flows in the direction of the arrow shown in the figure. When the magnetic cores 6-1a to 6-1d are magnetized, they apparently constitute two field poles, and a three-phase AC output is obtained in the two-pole three-phase main power generation winding 3.

(Problems to be Solved by the Invention) The example illustrated in FIG. 3 described above is configured such that the excitation current to the excitation winding 4 is supplied by the external DC power supply 5. Therefore, in the example shown in FIG. 3, there is a problem that the DC power supply 5 is required.

Further, when used with a single-phase load, the load compensation is small, so there is a problem that the voltage drop increases when the load current increases.

The present invention aims to solve the above-mentioned problems, and includes a field winding that makes the rotor have, for example, six salient poles and generates, for example, a two-pole magnetic field on the rotor, and a field winding that is wound around the stator. The excitation winding and the field auxiliary winding magnetically coupled are wound, and the electromotive force induced in the field auxiliary winding causes a field current to flow through the field winding. It is an object of the present invention to provide a brushless generator which is an excited type generator and which has a small voltage drop at its terminal voltage even under a single-phase load. Therefore, the brushless generator of the present invention includes a stator that includes a rotor that generates a magnetic field, a main power generation winding that interlinks with the magnetic field of the rotor to generate an electromotive force, and an excitation winding that generates a magnetic field. , in a brushless generator configured such that a field current is passed through the rotor by the magnetic field of the excitation winding, and a voltage is induced in the main power generation winding by the magnetic field generated in the rotor. The excitation winding is configured to have a number of poles m which is an odd multiple of the number of poles of the main power generation winding, the excitation winding is short-circuited with a rectifying element, and the rotor has m-pole shaped protrusions. The polar field core is provided with a field winding that generates a magnetic field, and the m-pole-shaped salient pole field core is provided with a field auxiliary winding that is magnetically coupled to the excitation winding, and the excitation The self-excited generator is equipped with a rectifier that rectifies the electromotive force induced in the field auxiliary winding by the magnetic field generated based on the excitation current flowing through the winding, and causes the field current to flow through the field winding. It is a feature. This will be explained below with reference to the drawings.

(Example) FIG. 1 shows the configuration of an embodiment of a brushless generator according to the present invention, and FIG. 2 shows a winding diagram of an embodiment of each winding wound around a stator.

In FIG. 1, reference numeral 11 is a stator, 12 is a rotor, 13 is a two-pole three-phase main power generation winding, 14 is a six-pole single-phase excitation winding, and 15-1a to 15-1f are field cores. , 15-2a to 15-2f are salient poles,
17 is a field winding, 18 is a field auxiliary winding, 19 is a rectifier, and 20 is a diode.

The stator 11 includes a two-pole three-phase main power generation winding 13,
A six-pole, single-phase excitation winding 14 is wound thereon, and the six-pole, single-phase excitation winding 14 is short-circuited with a diode 20 . The two-pole, three-phase main power generation winding 13 and the six-pole, single-phase excitation winding 14 wound around the stator 11 are wound, for example, in the manner shown in FIG. 2.

In Figure 2, 36 slots are connected to the stator 11.
The 36 slots are provided with u, v,
Main power generation winding 13 for each phase of w and 6-pole excitation winding 1
4 is wrapped. The numbers shown in the figure indicate the number of conductors inserted into the slots, and the symbols u, v, and w are star-connected three-phase output ends. Further, the diode 20 is connected to the terminals x and y of the six-pole single-phase excitation winding 14 as described above.

The rotor 12 has six salient poles 15-2a to 15-2f as shown in FIG.
7 is wound so as to apparently form two magnetic poles as shown in FIG. The rotor 12 also includes a field auxiliary winding 18, for example, a field core 15-1.
As will be explained later, the field windings 17 are connected so that the voltages generated in each of the field windings 17 are electrically added, and the other end is connected to a rectifier. It is connected to the AC side terminal No. 19. The DC terminal side of the rectifier 19 is connected to the field winding 17.

In one embodiment of the brushless generator having the configuration described above, when the rotor 12 starts rotating, the field core 15-1 in the rotor 12
A voltage is induced in the excitation winding 14 due to the residual magnetism of a to 15-1f. This induced voltage causes an exciting current to flow in one direction through the diode 20, and generates a substantially stationary magnetic field, although it generally includes pulsations. Since the rotor 12 rotates in the static magnetic field, the field cores 15-1b, 1 of the rotor 12
A voltage is induced in each of the field auxiliary windings 18 wound around the coil 5-1e, and the field current rectified by the rectifier 19 flows into the field winding 17. As a result, each magnetic pole is generated in the rotor 12 as shown in FIG. 1, and two poles, S and N, are apparently formed.

This apparently two-pole field magnetic flux contains a weak six-pole component because the field cores 15-1b and 15-1e have a tendency to be S and N poles due to their structure. A voltage is induced in the six-pole, single-phase excitation winding 14. Due to this induced voltage, the excitation current continues to flow through the excitation winding 14 as described above. In other words, it becomes a self-excited generator.

During a single-phase load, the armature reaction increases as the load current increases, so the field auxiliary winding 1
8 becomes larger, and therefore the field current flowing through the field winding 17 increases. As the field current increases, the output voltage of the main power generation winding 13 also increases, but the voltage induced in the excitation winding 14 also increases, which causes an increase in the electromotive force of the field auxiliary winding 18. , thereby increasing the field current flowing through the field winding 17. Therefore, even if the load current increases during a single-phase load, the decrease in the load terminal voltage is small.

Further, even in the case of a three-phase load, fluctuations in the output voltage can be suppressed to a small level by the same effect as described above.

(Effects of the Invention) As explained above, according to the present invention, for example, the stator is provided with a six-pole single-phase excitation winding, the rotor is formed into six-pole salient poles, and the two-pole three-phase For the main power generation winding, a field winding that generates a two-pole magnetic field and a field auxiliary winding that is magnetically coupled to the six-pole single-phase excitation winding of the stator are connected in the above-mentioned six-pole shape. It is wound around a salient pole field core, and the field current is passed through the field winding using the electromotive force induced in the field auxiliary winding, so it becomes a self-excited brushless generator, and it can also be used for single-phase loads. Even in such cases, fluctuations in the output voltage can be reduced. Furthermore, since no external DC power source is required, the efficiency of the generator is improved and the generator is simple.

[Brief explanation of drawings]

Fig. 1 shows the configuration of an embodiment of a brushless generator according to the present invention, Fig. 2 shows a winding diagram of an embodiment of each winding wound around a stator, and Fig. 3 shows a conventional brushless generator.
The configuration of a pole three-phase generator is shown. In the figure, 11 is a stator, 12 is a rotor, 13 is a main power generation winding, 14 is an excitation winding, and 15-1a to 1
5-1f is the field core, 15-2a to 15-2
f represents a salient pole, 17 a field winding, 18 a field auxiliary winding, 19 a rectifier, and 20 a diode.

Claims (1)

[Claims] 1. The stator is equipped with a rotor that generates a magnetic field, a main power generation winding that interlinks with the rotor's magnetic field to generate an electromotive force, and an excitation winding that generates a magnetic field, and In a brushless generator configured such that a field current is passed through the rotor and a voltage is induced in the main power generation winding by the magnetic field generated in the rotor, the excitation winding wound around the stator is connected to the main power generation winding. The winding is configured to have a number of poles m which is an odd multiple of the number of poles of the wire, the excitation winding is short-circuited with a rectifying element, and the rotor generates a magnetic field in a salient pole field core having an m-pole shape. A field winding is provided, and a field auxiliary winding magnetically coupled to the excitation winding is provided in the m-pole-shaped salient pole field core, and the field core is generated based on an excitation current flowing through the excitation winding. 1. A brushless generator comprising a rectifier for rectifying the electromotive force induced in the field auxiliary winding by a magnetic field to cause a field current to flow in the field winding.