JP2933151B2 - Generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a generator used for a cogeneration system, a hydroelectric, thermal or nuclear power generation system.

[0002]

2. Description of the Related Art As is well known, in many conventional rotary drive generators used in various power generation systems, the frequency of output power changes according to the number of revolutions of a drive shaft. In order to maintain a predetermined value, a means for adapting the high-speed rotation speed of a rotary drive source such as a turbine or a water turbine and the frequency of the power supplied by the generator is required.

In order to reduce the number of rotations or to adjust the number of poles of the generator, the high-speed rotating body and the drive shaft of the generator are connected via mechanical reduction means such as gears. A method of operating a generator so that output power of a predetermined frequency is obtained, or a method of driving a generator drive shaft at a high rotational speed of a rotary drive source to generate high frequency power, and thereafter, a frequency conversion device There is a method in which the frequency is converted into a predetermined frequency and supplied.

[0004]

In the above prior art,
There are the following issues. a. The method using the mechanical deceleration means causes a loss of about 1% of the supplied energy. b. When any of the above methods is applied, the scale of the entire apparatus increases, and in the method using mechanical deceleration means, maintenance and management become difficult due to an increase in the number of movable parts. c. Since the rotation speed control is difficult, it is difficult to stabilize the frequency. An object of the present invention is to solve the above problems.

[0005]

In order to solve the above-mentioned problems, according to the present invention, a drive shaft is rotatably installed coaxially inside a fixed hollow cylindrical conductor, and both ends of the hollow cylindrical conductor are provided. A cylindrical field coil extending across the portion is fixed in parallel to the outside of the drive shaft, and the cylindrical field coil is rotatably supported in a space between the drive shaft and the inner wall of the hollow cylindrical conductor, and The cylindrical field coil was connected to the excitation current source, and power output wires were connected to both ends and the center of the hollow cylindrical conductor corresponding to both ends of the cylindrical field coil, respectively, and connected to both ends. We propose a generator that connects each wire and configures a power output part between the wire connected to the center and the wires connected to both ends.

According to the present invention, in the above structure, a plurality of cylindrical field coils are provided outside the drive shaft, and both ends of the cylindrical field coil are bent outward to form an inner wall of the hollow cylindrical conductor. It is proposed to provide a magnetic core close to.

Further, the present invention proposes that the exciting current source has an AC or DC exciting current in the above configuration.

The present invention also provides a drive shaft rotatably mounted coaxially inside a fixed hollow cylindrical conductor, and a bar-shaped permanent magnet extending across both ends of the hollow cylindrical conductor parallel to the outside of the drive shaft. , The rod-shaped permanent magnet is rotatably supported in a space between the drive shaft and the inner wall of the hollow cylindrical conductor, and both ends and the center of the hollow cylindrical conductor corresponding to both ends of the rod-shaped permanent magnet are fixed. The present invention proposes a generator in which a power output wire is connected to each of the above and the respective wires connected to both ends are connected, and a power output portion is formed between the wire connected to the central portion and the wires connected to both ends.

[0009]

In the above construction, when an exciting current is supplied from the exciting current source to the cylindrical field coil, the magnetic flux generated by the cylindrical field coil is chained from the inside to the outside at one end of the hollow cylindrical conductor. At the same time, the other end crosses inward from the outside.

Therefore, when the drive shaft is rotated by a rotary drive source such as a turbine or a water turbine, the cylindrical field coil forms a space between the drive shaft and the inner wall of the hollow cylindrical conductor while drawing a cylindrical rotation locus. Since the hollow cylindrical conductor is rotated, induced electromotive forces are generated in the hollow cylindrical conductor in opposite directions at one end and the other end in the longitudinal direction. Then, the induced electromotive force in the opposite direction appears as output power in the same direction at a power output portion between electric wires connected to the central portion and both ends of the hollow cylindrical conductor.

When the exciting current flowing through the cylindrical field coil is DC, the direction of the induced electromotive force generated in the hollow cylindrical conductor does not change, so that the generator of the present invention operates as a DC generator. This operation is not affected at all by the rotation speed of the drive shaft.

On the other hand, when the exciting current flowing through the cylindrical field coil is an alternating current, the direction of the induced electromotive force generated in the hollow cylindrical conductor changes in accordance with the direction of the exciting current. Can obtain an alternating voltage equal to the frequency of the exciting current. In this case, the generator of the present invention operates as an AC generator in which the frequency of the exciting current becomes the output frequency, and the AC operation is completely affected by the rotation speed of the drive shaft in the AC operation as in the above-described DC operation. Absent. And since the frequency of the exciting current in the exciting current source can be easily stabilized,
When the present invention is used as an AC generator, the output frequency can be easily stabilized.

In the above operation, if the magnetic core of the cylindrical field coil is bent outward at both ends so as to be close to the inner wall of the hollow cylindrical conductor, the flux linkage can be increased. The power, and thus the output voltage from the power output, can be increased.

On the other hand, by providing a plurality of cylindrical field coils outside the drive shaft, the output current capacity from the power output unit can be increased.

Further, as described above, when operating as a DC generator, it is not necessary to change the direction of the induced electromotive force generated in the hollow cylindrical conductor, so that the magnetic core is used instead of the cylindrical field coil. A rod-shaped permanent magnet having the same shape and having the same magnetic pole can be used, and in this configuration, the excitation current source can be omitted.

[0016]

Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory longitudinal sectional view showing an example of the configuration of the generator of the present invention, and FIG. 2 is a transverse sectional view taken along line XX of FIG.

In these figures, reference numeral 1 denotes a hollow cylindrical conductor made of copper or aluminum. The hollow cylindrical conductor 1 is fixed by an appropriate structure, and a drive shaft 2 is installed coaxially inside the hollow cylindrical conductor. The drive shaft 2 is connected to an output shaft (not shown) of a rotary drive source such as a turbine or a water wheel. Reference numeral 3 denotes a drive shaft bearing.

Reference numeral 4 denotes a magnetic core. The magnetic core 4 is disposed in the longitudinal direction of the hollow cylindrical conductor 1 at both ends thereof and fixed to the outside of the drive shaft 2. The magnetic core 4 has a configuration in which both end portions 5 are bent outward to approach the inner wall of the hollow cylindrical conductor 1. The four magnetic cores 4 are provided for each rotation angle of 90 degrees. Of course, the number of the magnetic cores 4 may be more or less than this, and may be appropriately arranged and fixed as needed. The magnetic core 4 is supported on the drive shaft 2 by a support member 6 made of a non-ferromagnetic material.

A cylindrical field coil 7 is wound around the magnetic core 4, and both ends of the cylindrical field coil 7 are connected to slip rings 8 a and 8 b installed on the drive shaft 2, respectively. These slip rings 8a and 8b have an exciting current source 9
Are brought into pressure contact with the electrodes 10a and 10b which are connected to. All of the cylindrical field coils 7 are configured so that magnetic poles are generated in the same direction by the exciting current from the exciting current source 9. A power output wire 13 is connected to each end of the hollow cylindrical conductor 1 and a power output wire 14 is connected to the center of the hollow cylindrical conductor 1, and a power output wire connected to each end of the hollow cylindrical conductor 1. Reference numeral 13 denotes a power output unit 11 connected between the power output wire 13 connected thereto and the power output wire 14 connected to the central portion. still,
The connection method of these electric wires 13 and 14 is appropriate.

In the above configuration, when an AC exciting current is supplied from the exciting current source 9 to the cylindrical field coil 7, the magnetic flux 12 generated by all the cylindrical field coils 7 in a certain half cycle is At one end 5a, the hollow cylindrical conductor 1 is linked from inside to outside, and at the other end 5b, it is linked from outside to inside. And in the other half cycle, they are linked in the opposite direction.

Therefore, when the drive shaft 2 is rotated by a rotary drive source such as a turbine or a water wheel, the cylindrical field coil 7 causes the space between the drive shaft 2 and the inner wall of the hollow cylindrical conductor 1 to move in a cylindrical rotating manner. The magnetic flux 1 that rotates while drawing a trajectory and thus interlinks
2 moves on the circumference at both ends of the hollow cylindrical conductor 1, in the length direction of the hollow cylindrical conductor 1, induced electromotive forces are generated at one end and the other end, which are opposite to each other. All of these induced electromotive forces appear in the power output unit 1 as output voltages in the same direction.

That is, in one half cycle of the AC exciting current, an induced electromotive force is generated in a direction in which the back faces each other as shown by the solid arrow a, and in the other half cycle, the two-dot chain arrow b As shown in the drawing, induced electromotive force is generated in the directions facing each other, and thus an alternating voltage having a frequency equal to the frequency of the exciting current is generated in the power output unit 11 and operates as an AC generator.

The induced electromotive force e in the above operation can be expressed by the following equation. e ∝ L R n M M If where L is the length of the hollow cylindrical conductor, R is the radius of the hollow cylindrical conductor, n is the number of revolutions of the drive shaft, M is the coefficient, and If is the exciting current. , And the magnetic flux density B = M · If.

On the other hand, when the exciting current flowing through the cylindrical field coil 7 is DC, the direction of the output voltage of the power output unit 11 does not change, and therefore the generator of the present invention operates as a DC generator.

As described above, when the generator of the present invention is operated as a DC generator, a permanent magnet having the same shape and the same magnetic pole as the above-mentioned magnetic core is used instead of the cylindrical field coil. be able to.

As described above, the frequency of the output voltage generated in the power output unit 11 is the same as the frequency of the exciting current, is not affected by the rotational speed of the drive shaft at all, and Since the stabilization of the frequency of the current can be easily performed, the stabilization of the output frequency is very easy.

The power output section 11 is composed of electric power output wires connected to both ends and the center of the cylindrical body 1 which does not rotate. Therefore, the power output section 11 includes a slip ring for supplying power from the rotating section to the fixed section. No equipment is required, and maintenance and management are easy.

[0028]

As described above, the present invention has the following effects. a. Since no mechanical deceleration means is used from a high-speed rotary drive source such as a turbine or water turbine to the drive shaft of the generator,
Loss is reduced. b. Since it is not necessary to use the mechanical deceleration means and the frequency conversion device, the scale of the entire device can be reduced. c. Since the number of moving parts is small, maintenance and management are easy. d. When used as an AC generator, stabilization of the output frequency is very easy.

[Brief description of the drawings]

FIG. 1 is an explanatory longitudinal sectional view showing an example of a configuration of a generator according to the present invention.

FIG. 2 is a cross-sectional view taken along line XX of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hollow cylindrical conductor 2 Drive shaft 3 Bearing 4 Magnetic core 5 End part 6 Support member 7 Cylindrical field coil 8a, 8b Slip ring 9 Excitation current source 10a, 10b Electrode 11 Power output part 12 Magnetic flux 13, 14 Power output electric wire

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-254051 (JP, A) JP-A-57-199462 (JP, A) Fully open 1984-159178 (JP, U) Really open 1962 145475 (JP, U) Actually open 48-21102 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02K 19/00-19/38

Claims (6)

(57) [Claims] 1. Coaxial inside of a fixed hollow cylindrical conductor
The drive shaft is installed rotatably in the hollow cylindrical conductor
A cylindrical field coil extending over both ends of the drive shaft outside the drive shaft.
Fixed to the row, this cylindrical field coil with drive shaft and hollow cylinder
When supported rotatably in the space between the inner walls of the conductor
Then, connect the cylindrical field coil to the excitation current source, and
Ends and center of the hollow cylindrical conductor corresponding to both ends of the coil
Connect the power output wires to each of the
Connect each connected wire, and connect the
To configure the power output section between the wires connected to the ends
Generator characterized by 2. A plurality of cylindrical field coils are fixed outside a drive shaft.
The generator according to claim 1, characterized in that: 3. Both ends of a cylindrical field coil are bent outward.
A magnetic core close to the inner wall of the hollow cylindrical conductor
The generator according to claim 1 or 2, wherein 4. A structure in which an exciting current source supplies an alternating exciting current.
The generator according to claim 1, wherein 5. A structure in which an exciting current source supplies a DC exciting current.
The generator according to claim 1, wherein 6. A coaxial inner side of a fixed hollow cylindrical conductor.
The drive shaft is installed rotatably in the hollow cylindrical conductor
A bar-shaped permanent magnet across both ends of the shaft is parallel to the outside of the drive shaft.
To the drive shaft and the hollow cylindrical guide.
It is rotatably supported in the space between the inner walls of the body,
Both ends and center of hollow cylindrical conductor corresponding to both ends of magnet
Connect the power output wires to each of the
Connect each connected wire, and connect the
To configure the power output section between the wires connected to the ends
Generator characterized by