JP2011091973A - Generator motor for flywheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a generator motor for a flywheel, capable of efficiently converting energy, even if using equipment having a large gap with a vacuum layer and heat-insulating layer. <P>SOLUTION: The generator motor for the flywheel includes: a first permanent magnet rotor 1 with a flywheel 3; a second permanent magnet rotor 5 that is connected with the first permanent magnet rotor 1; and a field coil 7 sandwiched by the first permanent magnet rotor 1 and second permanent magnet rotor 5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a flywheel generator motor, and more particularly to a flywheel generator motor using a non-contact bearing.

FIG. 8 is a schematic view of a conventional flywheel generator motor.
In this figure, 101 is a permanent magnet rotor, 103 is a flywheel connected to the permanent magnet rotor 101 by a connecting shaft 102, 104 is a vacuum container for housing the permanent magnet rotor 101 and the flywheel 102, and 105 is a back iron. 106 are field coils fixed to the back iron 105.

  As described above, in the conventional flywheel device using the non-contact bearing, the permanent magnet rotor 101 and the flywheel 103 are contained in the vacuum vessel 104 in order to eliminate the windage loss.

JP 2007-74900 A

Hitoshi Hasegawa, Hiroshi Seino, Ken Nagashima, Kei Takeda, Masafumi Ikeda, Masato Murakami, “Performance Test Results of Permanent Magnet Type Non-Contact Magnetic Clutch”, 2009 Annual Conference of the Institute of Electrical Engineers of Japan (5-199), Volume 5, pp . 298 Gen Kuwata, Noriyasu Sugitani, and Osamu Saito, "Development of Low Loss Active Bearing For the Flywheel UPS, ISMB 10"

  However, as described above, in the flywheel device using the non-contact bearing, since it is housed in the vacuum vessel, a device for taking out the torque or electric power of the flywheel in a non-contact manner is required. In a non-contact clutch, when a permanent magnet is used, the attractive force has a significant effect on the dynamic stability when it is pulled off. There is also a problem that a mechanical tripping mechanism is required.

In the case of a generator motor, there is a problem of heat generation in the rotor and field coil when it is put in a vacuum layer. Further, when the field coil is out of the vacuum layer, the gap is increased, and in the low temperature superconducting magnetic bearing, the gap is further increased due to adiabatic isolation. When the gap is increased in this way, there is a problem that the energy conversion efficiency decreases.
In view of the above circumstances, an object of the present invention is to provide a flywheel generator motor that can efficiently convert energy even in a device having a large gap including a vacuum layer and a heat insulating layer.

In order to achieve the above object, the present invention provides
[1] In a generator motor for a flywheel, a first rotor with a flywheel, a second rotor connected to the first rotor, the first rotor, and the second rotation A vacuum vessel for housing the child, and a field coil outside the vacuum vessel and sandwiched between the first rotor and the second rotor are provided.

[2] In the flywheel generator motor described in [1], the first rotor and the second rotor are permanent magnets.
[3] In the flywheel generator motor described in [2] above, the permanent magnet has a vertical structure with two poles.
[4] The flywheel generator motor according to [2], wherein the permanent magnet has a Halbach structure.

  According to the present invention, even a device having a large gap having a vacuum layer or a heat insulating layer can efficiently convert energy.

It is a schematic diagram of the generator motor for flywheels which shows the Example of this invention. It is the figure which looked at the coil of the generator motor for flywheels which shows the Example of this invention from the axial direction. It is a figure which shows the specific example of the coil of the generator motor for flywheels shown by FIG. It is the figure which looked at the rotor of the generator motor for flywheels which shows the Example of this invention from the axial direction. It is a figure which shows the specific example of the rotor of the generator motor for flywheels shown by FIG. It is a figure which shows the measured value of the magnetic flux density (magnetomotive force) between the gaps of the conventional method and the method of the present invention. It is a figure which shows the structure of the rotor of the generator motor for flywheels which shows the other Example of this invention. It is a schematic diagram of the conventional generator motor for flywheels.

  The generator motor for a flywheel according to the present invention includes a first rotor with a flywheel, a second rotor coupled to the first rotor, the first rotor, and the second rotation. A vacuum vessel that houses the child, and a field coil that is located outside the vacuum vessel and is sandwiched between the first rotor and the second rotor.

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is a schematic view of a flywheel generator motor according to an embodiment of the present invention, FIG. 2 is a view of the coil of the flywheel generator motor viewed from the axial direction, and FIG. 3 is a flywheel generator shown in FIG. FIG. 4 is a view showing a specific example of a coil of an electric motor, FIG. 4 is a view of a rotor of a generator motor for a flywheel showing an embodiment of the present invention as viewed from the axial direction, and FIG. 5 is an illustration of the generator motor for a flywheel shown in FIG. It is a figure which shows the specific example of a rotor.

  In these drawings, 1 is a first permanent magnet rotor, 3 is a flywheel connected to the first permanent magnet rotor 1 by a connecting shaft 2, and 5 is a flywheel 2 of the first permanent magnet rotor 1. A second permanent magnet rotor connected by a connecting shaft 4 on the side opposite to the side; and 6, a vacuum container for housing the first permanent magnet rotor 1 and the flywheel 3 and the second permanent magnet rotor 5. , 7 is a connecting shaft that is sandwiched between the first permanent magnet rotor 1 and the second permanent magnet rotor 5 and to which the first permanent magnet rotor 1 and the second permanent magnet rotor 5 are coupled. 4 is a field coil for extracting output, which is arranged around 4, and g is a gap between the first permanent magnet rotor 1 and the second permanent magnet rotor 5.

As shown in FIG.2 and FIG.3, the coil 5 is comprised by the disk shape by the six divided coil elements 5A-5F, for example.
Further, as shown in FIG. 4 or FIG. 5, the first permanent magnet rotor 1 and the second permanent magnet rotor 5 have a vertical structure with two poles, that is, a disc shape composed of an N pole and an S pole. The rotors of different polarity are stuck together.

FIG. 6 is a diagram showing measured values of magnetic flux density (magnetomotive force) between the gaps of the conventional method and the method of the present invention. In this figure, the horizontal axis indicates the actual gap (mm), the vertical axis indicates the gap magnetic flux density [T], ▲ indicates the conventional method, and ● indicates the method of the present invention.
As is apparent from this figure, the method ● of the present invention can increase the gap magnetic flux density as compared with the conventional method ▲.

As described above, by configuring the generator motor having a structure in which the field coil 7 is sandwiched between the first permanent magnet rotor 1 and the second permanent magnet rotor 5, the exciting current component is reduced to the first permanent magnet rotor. Even if the gap g between the first permanent magnet rotor 1 and the second permanent magnet rotor 5 is large, the energy can be efficiently converted. it can.
According to the present invention, even a generator motor with a large gap having a vacuum layer or a heat insulating layer can efficiently convert energy.

In the above embodiment, the first permanent magnet rotor 1 and the second permanent magnet rotor 5 are usually vertical structures with two poles, but may be Halbach structures. The number of poles is not limited to only two. Further, the rotor and the magnetic field coil may have a cylindrical structure.
FIG. 7 is a diagram showing a configuration of a rotor of a flywheel generator motor according to another embodiment of the present invention.

As shown in this figure, the rotor 11 of the flywheel generator motor has a Halbach structure for both the first permanent magnet rotor and the second permanent magnet rotor. That is, a permanent magnet block in which a magnet group in which the direction of the magnetic pole is rotated by 90 ° for each adjacent permanent magnet is arranged.
In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.

  The generator motor for a flywheel of the present invention can be used as a generator motor for a flywheel capable of efficiently converting energy even if it is a generator motor having a vacuum layer or a heat insulating layer and having a large gap.

DESCRIPTION OF SYMBOLS 1 1st permanent magnet rotor 2, 4 Connecting shaft 3 Flywheel 5 2nd permanent magnet rotor 5A-5F Six divided coil elements 6 Vacuum vessel 7 Field coil g 1st permanent magnet rotor Between rotor and second permanent magnet rotor 11 Rotor (Halbach structure)

Claims (4)

(A) a first rotor with a flywheel;
(B) a second rotor coupled to the first rotor;
(C) a vacuum vessel that houses the first rotor and the second rotor;
(D) A flywheel generator motor comprising a field coil outside the vacuum vessel and sandwiched between the first rotor and the second rotor.   2. The flywheel generator motor according to claim 1, wherein the first rotor and the second rotor are permanent magnets.   3. The flywheel generator motor according to claim 2, wherein the permanent magnet has a vertical structure with two poles.   The flywheel generator motor according to claim 2, wherein the permanent magnet has a Halbach structure.

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