JPH0524040Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a variable inertia generator, and is particularly used to vary the moment of inertia of a rotating shaft in automobile driving test simulations, etc. This article relates to a variable inertia generator.

(Prior Art) In automobile driving test simulations, etc., it is sometimes necessary to change the moment of inertia of a rotating shaft. Conventionally, in such cases, the moment of inertia was changed by manually attaching and detaching a weight to the rotating shaft.

(Problems to be solved by the invention) However, as described above, manually attaching and detaching the weight each time the moment of inertia was changed did not allow running tests to progress and was very inconvenient.

This invention was made to eliminate the above-mentioned conventional drawbacks, and its purpose is to provide a variable inertia generating device that can change the moment of inertia of a rotating shaft with a simple operation.

(Means for solving the problem) Therefore, in the variable inertia generator of this invention, a rotating shaft to which a moment of inertia is to be applied is provided,
A rotating body serving as an inertial load is disposed at a distance from and approximately coaxially with the rotating shaft, and the rotating body is rotatably supported on a support, and the rotating shaft and the rotating body are opposed to each other. An electromagnet on one side of the part,
A magnetic body is provided on the other side, and when the electromagnet is excited, the rotating body serving as the inertial load is configured to rotate following the rotational movement of the rotating shaft.

(Function) In the variable inertia generator with the above configuration, when the electromagnet is excited, the magnetic body receives an attractive force in the direction of the electromagnet, and the rotating body follows the rotational movement of the rotating shaft and performs a rotating movement. , the moment of inertia of the rotation axis increases. On the other hand, when the electromagnet is de-energized, the attractive force from the electromagnet no longer acts on the magnetic body, the rotating body no longer follows the rotational movement of the rotating shaft, and the moment of inertia of the rotating shaft decreases.

(Example) Next, a specific example of the variable inertia generator of this invention will be described in detail with reference to the drawings.

A first embodiment thereof is shown in FIGS. 1 and 2.
In FIG. 1, reference numeral 1 denotes a rotating shaft, and a cylindrical portion 2 in the shape of a pot is formed at one end thereof. As shown in FIG. 1, this cylindrical portion 2 extends coaxially with the rotating shaft 1 and has an opening at its tip end. On the other hand, 3 is a fixed shaft that serves as a support, and three rotating bodies 4 are mounted on the outer peripheral surface of one end of the shaft.
... are supported at intervals from each other. Each rotating body 4 is supported by a bearing or the like so as to be rotatable relative to the fixed shaft 3. Each rotating body 4 has a predetermined mass and shape, and thus individually has a predetermined moment of inertia. FIG. 2 shows a cross section of the rotating bodies 4, each of which individually constitutes an electromagnet. Specifically, focusing on one of the rotary bodies 4, the rotary body 4 has a central hole 5 formed in the center thereof, through which the fixed shaft 3 is inserted. 4
The protrusions 7 are made to protrude outward in the radial direction at approximately equal intervals, and the windings 8 are arranged so that each protrusion 7 has four phases.
is wound so that each protrusion 7 constitutes a magnetic pole. The winding direction of the winding 8 is determined so that S poles and N poles of each magnetic pole are arranged alternately. As shown in FIG. 1, the rotating body 4 of the fixed shaft 3...
Slip rings 9 are provided around the outer circumferential surface of the support portion adjacent to the support portion, and the lead portions 10, 10 of the winding 8 are brought into sliding contact with each slip ring 9. The slip rings 9 are connected to an external circuit (not shown), and by operating the external circuit, current is supplied to each winding 8 through the slip rings 9, and the electromagnet is excited. It is done like this. Here, it is assumed that the external circuit is configured to be able to excite each electromagnet independently. The rotating body 4 configured as described above has a fixed shaft 3 as shown in FIG.
The rotary shaft 1 is inserted into the cylindrical portion 2 of the rotary shaft 1 while being supported by the rotary shaft 1. At this time, each of the rotating bodies 4 and the rotating shaft 1 are arranged to be coaxial. As shown in FIG. 2, a cylindrical portion 2 facing each magnetic pole of the rotating body 4
A bulging portion 11 made of a magnetic material is formed on the inner circumferential surface of the bulging portion 11 so as to bulge toward each magnetic pole. Therefore, when the electromagnet is excited, each bulge 11 is attracted to each magnetic pole side.

Next, the operating state of the variable inertia generator configured as described above will be explained. When the external circuit is operated and current is supplied to the windings 8 of each rotating body 4 through the slip rings 9, each protrusion 7 is excited and the bulge 11
... will receive an attractive force from the magnetic pole. Then, each of the rotating bodies 4 performs a rotational movement following the rotational movement of the rotating shaft 1. That is, the moment of inertia of the rotating shaft 1 increases by the amount of each rotating body 4. On the other hand, when the supply of current is stopped, the bulging portion 11...
no longer receives attractive force from the magnetic poles, and each rotating body 4...
does not follow the rotational movement of the rotating shaft 1. In other words, the moment of inertia of the rotating shaft 1 is
It will decrease by the amount of... Note that the current may be supplied while the rotating shaft 1 is rotating, or may be supplied after the rotating shaft 1 has once stopped rotating.

As described above, in the first embodiment, the rotating bodies 4 are configured to follow the rotational movement of the rotating shaft 1 by the excitation operation of the electromagnets, so that the rotating shaft 1 can be easily moved by a simple operation. The moment of inertia of can be changed. Moreover, in the first embodiment, since a plurality of rotating bodies 4 are provided, the moment of inertia of the rotating shaft 1 can be adjusted in multiple stages by exciting the electromagnets of each rotating body 4 separately. It is possible to change it.

FIG. 3 shows a second embodiment. As shown in the figure, in this embodiment, a pot-shaped cylindrical portion 18 serving as a support is formed on one end side of the fixed shaft 17, and three rotating bodies are supported on the inner circumferential surface of this cylindrical portion 18. 19... is rotatably supported. Each rotating body 19
constitutes an individual electromagnet as in the first embodiment, but in this embodiment, each rotating body 19
... forms a central hole in the center of the disc-shaped body,
A plurality of protrusions 22 are made to protrude radially inward from the inner circumferential surface thereof at approximately equal intervals, and the winding 8 is wound around each protrusion 22 in a multiphase manner. One end side of the rotating shaft 23 is connected to each rotating body 19...
A bulge 24 made of a magnetic material is formed on the outer peripheral surface of the rotating shaft 23, which is inserted through the center hole of the rotary shaft 23 and faces each magnetic pole.

FIG. 4 shows a third embodiment. As shown in the figure, in this embodiment, a cylindrical member 29 with open ends serving as a support is attached to the upper end of the column 28, and three rotating bodies 19... is rotatably supported. Each of the rotating bodies 19... is an electromagnet having a configuration substantially similar to that of the second embodiment, and each rotating body 19... is positioned near the center in the longitudinal direction of the rotating shaft 30, and the rotating shaft 30 faces each magnetic pole.
A bulging portion 31 made of a magnetic material is formed on the outer circumferential surface of. In the second and third embodiments above, the first
It is possible to achieve the same effects as in the embodiment.

FIG. 5 shows a fourth embodiment. As shown in the figure, in this embodiment, a disk-shaped rotating body 35 is rotatably supported on the outer peripheral surface of one end side of a fixed shaft 34 serving as a support body. A plurality of protrusions 36 are formed on the circumference at a predetermined distance in the radial direction from the center of one end surface (the left side in the figure) of the rotating body 35 so as to protrude in the axial direction at approximately equal intervals. , windings 8 are wound around these protrusions in a polyphase manner to constitute an electromagnet. On the other hand, a disk portion 38 is formed on one end side of the rotating shaft 37, and the rotating body 3
5 on the magnetic pole side faces one end surface of the disk portion 38 (on the right side in the figure), and a bulge portion 39 made of a magnetic material is formed on one end surface of the disk portion 38 facing each magnetic pole. ing. In this embodiment, although the moment of inertia cannot be changed in a multi-stage manner, the moment of inertia of the rotating shaft 37 can be easily changed with a simple operation, substantially similar to each of the above embodiments. In addition, in the above-mentioned second to fourth embodiments, the first
The same parts as in the embodiment are indicated by the same reference numerals, and their explanations are omitted.

Although specific embodiments of the variable inertia generator of this invention have been described above, this invention is not limited to the above embodiments, and can be implemented with various changes within the scope of this invention. It is. For example, in each of the above embodiments, an electromagnet is provided on the rotating body and a magnetic material is provided on the rotating shaft, but the opposite may be used. Further, the number, mass, shape, etc. of the rotating bodies may be appropriately determined in consideration of the moment of inertia required of the rotating shaft.

(Effects of the invention) As mentioned above, the variable inertia generator of this invention is configured to cause the rotating body to follow the rotational movement of the rotating shaft by excitation of the electromagnet, so it is easy to operate. It is possible to change the moment of inertia of the rotation axis.

[Brief explanation of drawings]

Fig. 1 is a side cutaway view showing a first embodiment of the variable inertia generator of this invention, Fig. 2 is a front sectional view thereof, and Figs. 3 to 5 show second to fourth embodiments of this invention, respectively. FIG. 1, 23, 30, 37... Rotating shaft, 3, 34...
...Fixed shaft (support body), 18...Cylindrical part (support body),
29... Cylindrical member (support body), 4, 19, 35...
...Rotating body, 7, 22, 36...Protrusion (electromagnet),
8...Winding (electromagnet), 11, 24, 31, 39
...Bulging part (magnetic material).

Claims (1)

[Scope of utility model registration request] A rotary shaft to which a moment of inertia is to be applied is provided, a rotary body serving as an inertial load is disposed at a distance from the rotary shaft and substantially coaxially with the rotary shaft, and the rotary body is rotatably supported on a support body, An electromagnet is placed on one side of the rotating shaft and the rotating body, where they face each other.
A variable inertia generator comprising a magnetic material on the other side, and configured so that when the electromagnet is excited, the rotating body serving as the inertial load rotates following the rotational movement of the rotating shaft. .