JPH03251063A - Electric rotating machine - Google Patents

Abstract

PURPOSE:To achieve predetermined flywheel effect relevant to storage of power by disposing a rotor on the outer circumference of a stator and employing the rotor as a flywheel thereby making effective use of structural member. CONSTITUTION:A rotor 22 is disposed on the outer circumference of a stator 21 in order to provide a flywheel effect. In other words, when the rotor 22 is rotating, a rotor core 27 having larger outer diameter than the stator 21 exhibits flywheel effect. Furthermore, a rotor rim 29 supporting the rotor core 27 is disposed on the outer circumference of the rotor 27 and the diameter of the rotor rim 29 is set larger than that of the rotor core 27. Consequently, the rotor rim 29 rotates together with the rotor core 27 and functions as a flywheel. Since neither a flywheel nor a spindle is required, material can be saved for achieving a predetermined flywheel effect.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a rotating electrical machine that can effectively use structural materials to achieve a large flywheel effect for power storage.

(Prior art) Machines that operate while their main parts rotate, such as generators and electric motors, are called rotating electrical machines. Of these, rotating electrical machines used for power storage mechanically consist of a rotor, stator, The main parts are the flywheel, main shaft, etc.

FIG. 2 is a sectional view of a flywheel-equipped motor generator 1, which is one type of such a rotating electric machine.

In this motor generator 1 with a flywheel, a stator 3 is arranged around the outer periphery of a rotor 2. The rotor 2 consists of a rotor core 4 and a rotor coil 5 wound around the rotor core 4, while the stator 3 includes a stator frame 6, a stator core 7,
and a stator coil 8 wound around this stator core 7.

Further, the rotor 2 is connected to a flywheel 10 by a main shaft 9, and the main shaft 9 is further provided with a collector ring 11 that controls power flow between the rotating part and the stationary part. The entire load of the rotating parts including the rotor 4, main shaft 9, and flywheel 10 is supported by the rotor base 12.

In this motor generator 1 with a flywheel, either the rotor 2 or the stator 3 may be a field or an armature.
When the rotor 2 rotates inside the stator 3, the conductor of the root element cuts the magnetic flux created by the field, and an electromotive force is generated.

Note that inside this flywheel-equipped electric motor generator, a cooling gas 14 cooled by a gas cooler 13 is used.
is pumped by the fan 15, and the rotor 4, stator 5,
Cool the flywheel 10, etc.

In this flywheel-equipped motor generator 1, the flywheel 10 uses its inertia to average fluctuations in the shaft torque of the rotating parts, prevents pulsations in the generator output voltage, and also plays the role of storing a large amount of electric power ( flywheel effect). This flywheel effect is given by GD2, where the weight of the flywheel is G1 and the outer diameter is D. In the motor generator 1 with a flywheel, the rotor 2 also exhibits a flywheel effect when rotating, but the effect obtained is small due to its small diameter.

(Problem to be Solved by the Invention) However, the flywheel 10 as described above requires a main shaft 9 to rotate by being connected to the rotor 3, but the main shaft 9 makes the entire rotating electric machine larger. becomes more costly. Furthermore, the above-mentioned flywheel effect increases as the outside diameter of the flywheel 10 becomes larger; does not contribute to Therefore, in this respect, the materials of the flywheel 10 and the main shaft 9 are not effectively utilized.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rotating electric machine that can effectively use structural materials to achieve a large flywheel effect for power storage.

[Structure of the invention]

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a rotating electric machine characterized in that a rotor is arranged on the outer periphery of a stator, and the rotor has a flywheel effect. do.

(Function) The rotating electrical machine of the present invention has a rotor, which is a rotating part of the main structural members, arranged around the outer periphery of the stator, has a larger outer diameter than the stator, and is made of material at the location where the stator is arranged. The rotor is also made to function as a flywheel. Therefore, in the rotating electric machine of the present invention, there is no need to intentionally provide a flywheel and a main shaft, and while ensuring the desired flywheel effect, there is no wastage of material in obtaining this flywheel effect, and the entire rotating electric machine can be made compact. Therefore, it is possible to reduce costs.

(Example) The present invention will be described in detail below with reference to FIG.

The chamber-shaft motor generator 20 as a rotating electric machine according to this embodiment has a stator 21 disposed at the center, and a rotor 22 disposed around the outer periphery of the stator 21. The stator 21 has a stator coil 2
This stator core 24 has a stator core 24 wrapped with
The stator frame 25 supports the stator core 24, and the stator base 26 supports the loads of the stator core 24 and the stator frame 25. On the other hand, the rotor 22 has a rotor core 27
In addition to the rotor coil 28 wound around the rotor core 27, there is also a rotor rim 29 outside the rotor core 27 that supports the rotor core 27.

In this embodiment, the rotor coil 28 is supported by the bottom of a slot (not shown) of the rotor core 27 even during rotation, so that it is difficult to mechanically jump out toward the stator 21.

By the way, the rotor rim 29 is made by stacking a plurality of rings 30 of the same diameter made of a magnetic material. Further, the rotor rim 29 is connected to a thrust collar 31, and this thrust collar 31 supports the load of the rotating portion including the rotor rim 29 and the rotor core 27. And thrust color 3
1 rotates while sliding on a thrust bearing 32 and an upper guide bearing 33 that regenerates lateral vibration. Thrust color 3
1 also has a lower guide bearing 34 on the side of the stator base 26, which also corrects lateral vibration, but the circumferential speed of the thrust collar 31 at this location is considerably higher than that near the upper guide bearing 33. Preferably, the lower guide bearing 34 is a non-contact bearing such as a magnetic bearing to avoid loss due to wear.

A rotor 2 including a stator 21 and a rotor rim 29
The load of 2 is supported by the stator foundation port 35. Further, a collector ring 36 is attached to the upper part of the thrust collar 31.

On the other hand, as a cooling system, a gas cooler 37 is provided below the stator frame 25, and the cooling gas cooled by the gas cooler 37 is distributed to the upper, middle, and lower parts of the motor generator 20, respectively. circulated by a fan 38,
The inside of the motor generator 20 is cooled. Further, above the stator base 26, a water-cooling serpentine pipe 39 for lubricating oil for each member is provided.

The conduction generator 20 shown in this embodiment may be a horizontal axis machine, and may be of either a rotating armature type or a rotating field type. In addition, various methods can be used for the cooling system, such as cooling the stator coil 23 and rotor coil 28 that generate heat with water individually.

Such a motor generator 20 supplies power to a starter (not shown) from a power system (not shown).

The starter accelerates the rotor 22 to a predetermined rotational speed, and maintains the rotor 22 at a constant rotational speed until an output request is received.

When the rotor 22 rotates, an electromotive force is generated between it and the stator 21 due to electromagnetic induction, but the electrical energy related to this electromotive force is Exists as kinetic energy.

The kinetic energy W (J) of the rotor 22 is
The moment of inertia of 2 is J (kg-td), and the angular velocity is ω
(rid/s), then W − (1/2) Jω 2 = (1/2) (GD2r). However, GD” (=4J) (kg-i) is the flywheel effect related to power storage. be.

On the other hand, the kinetic energy E (J) at the rated rotation per 1 kW of output of the rotor 22 of the rotating electric machine 20 used in an induction machine, a synchronous machine, etc. is calculated using E = W / P CW 0 (1) formula. , =(1/P)(GD2/8)ω2×10-3r (2). where P is the power (in kW).

In this way, the rotating electricity 20 accumulates kinetic energy E by accelerating when it is under a light load, and stores this kinetic energy E by reducing its speed when it is outputting.

emit.

As is clear from equations (1) and (2), in order to store more power, the kinetic energy needs to be increased, and for that purpose, the flywheel effect (GD2) needs to be increased. It can be seen that a thicker flywheel effect can be obtained by increasing the outer diameter of the rotating part that functions as a flywheel.

In this embodiment, since the rotor 22 is disposed outside the stator 21 to generate an electromotive force, when the rotor 22 rotates, the rotor core 27 having a larger outer diameter than the stator 21 is first used to drive the flywheel. The effect is demonstrated. In this embodiment, a rotor rim 29 that supports the rotor core 27 is further provided on the outer periphery of the rotor 27, so that the rotor rim 29 has a larger diameter than the rotor core 27.

Therefore, the rotor rim 29 also functions as a flywheel by rotating together with the rotor core 27. At this time, it goes without saying that the rotor rim 29 is formed to have a strength that can withstand a large diameter rotating body.

Therefore, according to this embodiment, a large flywheel effect can be achieved by the rotor 22 including the rotor rim 29, so there is no need to intentionally provide a flywheel separately from the rotor 22. Therefore, the main shaft that connects the rotor 22 and the flywheel is also unnecessary, and the height of the rotating electric machine 20 is reduced and made compact by the omission of the flywheel and the main shaft, thereby reducing costs. For example, if there is a flammable insulator, a fire extinguisher must be installed, but if the rotating electric machine 20 as a whole becomes more compact, the capacity of this fire extinguisher can be reduced.
You can save costs as well.

Furthermore, since the stator 21 is arranged at the center of the rotor 22, the material of the rotating body is not used in parts that are not directly involved in the flywheel effect. Therefore, according to this embodiment, it is possible to achieve a large flywheel effect while effectively using materials, including not installing a main shaft.

Furthermore, in this embodiment, the rotor coil 28 is pushed outward of the rotating core 27 by centrifugal force during rotation. That is, the rotor coil 28 on the stator 21 side is pressed against the bottom portion of the slot of the rotating iron core 27. Therefore, the rotor coil 28 wound around the rotor core 28 will not protrude toward the stator 21 side.

〔Effect of the invention〕

As explained above, according to the rotating electrical machine of the present invention, the rotor can also be used as a flywheel, and there is no need to intentionally provide a flywheel and a main shaft. Therefore, it is possible to obtain a predetermined flywheel effect related to power storage while effectively using materials, making the entire rotating electric machine more compact, and reducing costs.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a motor generator according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a conventional electric power generator with a flywheel. 23... Stator coil, 24... Stator core, 27
...Rotor core, 28...Rotor coil, 29...
・Rotor rim.

Claims (1)

[Claims] A rotating electric machine characterized in that a rotor is disposed on the outer periphery of a stator, and the rotor has a flywheel effect.