JPS6223348A - Brushless generator - Google Patents

Abstract

PURPOSE:To contrive not to need an external DC power source and improve the efficiency of a generator, by making field current flow through a field winding, with an electromotive force induced in an auxiliary field winding. CONSTITUTION:A stator 11 is wound up with the main generating windings 13 of two poles and three phases and the exciting windings 14 of six poles and a single phase, and the exciting windings of six poles and a single phase are short-circuited by a diode 20. A rotor 12 is provided with six-pole-formed salient poles 15-2a-15-2f, and is wound up with a field winding 17 so that the magnetic poles of two poles in appearance may be formed. Besides, the rotor 12, for example, the respective sections 15-1b, 15-1c are wound up with auxiliary field windings 18. Field current flows through the field winding 17 due to voltage induced to the auxiliary field winding 18.

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 one 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 field auxiliary winding magnetically coupled are wound around a six-pole salient field core.

The present invention relates to a brushless generator that uses the electromotive force induced in the field auxiliary winding to flow a field current to form a self-excited synchronous generator.

(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. The so-called Nonaka 2 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 above-mentioned wild cow type generator. In addition, in Fig. 3.

1 is a stator, 2 is a rotor, 3 is a two-pole three-phase main generation winding, 4 is a single-phase four-pole excitation winding, 5 is a DC power supply, 6-ta
6-1d to 6-1d are field cores, 6-2a to 6-2d are salient poles, 7a to 7d are field windings, and 8 is a diode.

In the example shown in FIG.
Field VA windings 7a to 7cR+ are wound around pole-shaped field cores 6-1a to 6-1d.

A diode 8 is connected to each of the field windings 7a to 7d, and S is connected to the salient poles 6-2a to 6-2d in sequence.
, S, N, and N magnetic poles are generated to magnetize the field cores 6-1a to 6-1d. That is, in the example shown in FIG. 3, when the two-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 upper 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) In the example shown in FIG. 3 described above, the excitation current to the excitation winding 4 is supplied by an 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.

Furthermore, when used with two single-phase loads, 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 for generating, for example, a two-pole magnetic field in the rotor by making a seven-rotor into a six-pole salient pole, and a field winding 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. , taking advantage of the brushless generator having a configuration in which 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 two rotors.
The excitation winding wound around the stator is configured to have a number of poles m that is an odd multiple of the number of poles of the main power generation winding.

The excitation winding is short-circuited by a rectifying element, and the rotor is provided with a field that generates a magnetic field in an m-pole-shaped salient pole field core [with a winding and a field magnetically coupled with the excitation winding]. A magnetic auxiliary winding is provided in the salient pole field core having the m-pole shape, and the electromotive force induced in the field auxiliary winding is rectified by a magnetic field generated based on the excitation current flowing in the excitation winding. It is characterized by being equipped with a rectifier that allows field current to flow through the magnetic winding, making it a self-excited generator. 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, numeral 11 is a stator, 12 is a rotor, 1
3 is a two-pole three-phase main power generation winding, 14 is a six-pole single-phase excitation winding, 15-1a to 15-1f is a field core, 15-2
a to 15-2 f is a salient pole.

17 is a field winding, 18 is a field auxiliary winding, 19 is a rectifier,
20 represents a diode.

The stator 11 has 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 . Stator 1
The two-pole, three-phase main power generation winding 13 and the six-pole, single-phase excitation winding 14 are wound in the manner shown in FIG. 2, for example.

In FIG. 2, 36 slots are provided in the stator 11, and U is provided in the 36 slots.

Main power generation winding 13 for each phase of v and w, and 6-pole excitation winding 14
is wrapped. The numbers shown in the figure indicate the number of conducting wires inserted into the slots, and the symbols u, v, and w are star-connected three-phase output ends. Furthermore, 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 15-2 as shown in FIG.
a to 15-2 f, and the field winding 17 is wound so as to apparently form two upper magnetic poles as shown in FIG. Further, field auxiliary windings 18 are wound around the rotor 12, for example, around field cores 15-1b and 15-1e, and as will be explained later, the voltages generated in the field windings 17 are electrically connected. The field winding 17 is connected in such a way that the two ends are added together, and the other end is connected to the AC side terminal of the rectifier 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 first rotor 12 starts rotating, the excitation winding due to the residual magnetism of the field cores 15-1a to 15-1f in the rotor 12 A voltage is induced at 14.

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, 15-1 of the rotor 12
A voltage is induced in each of the field auxiliary windings 18 wound around the coil 8, and a 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 apparent upper S and N poles are formed.

This apparent field magnetic flux of the upper two poles is due to the structure of the field core 15.
Since lb and 15-1e tend to be S and N poles, they include 6 components with 2 weaknesses, and a voltage is induced in the 6-pole single-phase excitation winding 3i14 by these 6 components. 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, as the load current increases, the armature reaction increases, so the voltage induced in each field auxiliary winding 18 increases, and therefore the field current flowing in the field winding 17 increases. . Although the output voltage of the main power generation winding 13 also increases due to the increase in field current, the output voltage of the excitation winding 14 also increases.
The voltage induced in the auxiliary field winding 18 increases, causing 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, 6
In addition to providing a pole single-phase excitation winding, the two rotors are formed into six-pole salient poles, and a field winding that generates a two-pole magnetic field for the two-pole three-phase main power generation winding.

The 6-pole single-phase excitation winding of the stator and the field auxiliary winding that are magnetically coupled are wound around the 6-pole shape actual loss field core, and the electromotive force induced in the field auxiliary winding is The configuration is such that the field current flows through the field m winding using .

It becomes a self-supporting brushless generator, and can reduce fluctuations in output voltage even in the case of a single-phase load. Furthermore, since no external DC power source is required, the efficiency of the generator is improved and the generator is simple.

[Brief explanation of the drawing]

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 two-pole three-phase generator. The configuration of the 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, 15-1a to 15-1f are field cores, 15-2a to 15-2f are salient poles, 17 is a field winding, and 18 is a field auxiliary winding. 19 represents a rectifier, and 20 represents a diode.

Claims (1)

[Claims] 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. In a brushless generator configured such that a field current is passed through 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 pole of the main power generation winding. The excitation winding is short-circuited with a rectifying element, and the rotor is a field winding that generates a magnetic field in an m-pole salient field core. The m-pole shaped salient pole field core is provided with a field auxiliary winding magnetically coupled to the excitation winding, and a magnetic field generated based on the excitation current flowing through the excitation winding. A brushless generator characterized by comprising a rectifier that rectifies the electromotive force induced in the field auxiliary winding and causes a field current to flow through the field winding, and is a self-excited generator.