JPS6145698Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rotor of a rotating electric machine, and in particular,
The present invention relates to a rotor for a rotating electric machine in which a laminated iron core of the rotor is locked at its support shaft portion with a key.

Generally, rotating electric machines such as generators and electric motors include a rotor 1 and a stator 2, as shown in FIG. The stator 2 includes an iron core 4 mounted on a stator frame 3 and a stator coil 5 wound around the iron core 4.
On the other hand, the rotor 1 includes a rotor shaft 6 whose both ends are rotatably supported by the stator frame 3, and a rotor shaft 6 which is attached to the rotor shaft 6 via a key 7. It is composed of a laminated core 8 and a rotor coil 9 wound around the laminated core 8. Among these, the rotor coil 9 includes coil supporting members 10, 10 attached to both sides of the laminated iron core 8,
Further, a binding wire 11 is wound around the outer circumference of the rotor coil 9, thereby preventing the rotor coil 9 from detaching due to centrifugal force.

As described above, the laminated core 8 of the rotor is usually connected to the rotor shaft 6 via the coil support members 10, 10.
The left and right movement of the rotor shaft 6 is stopped by the step 6A of the rotor shaft 6, and at the same time, the rotor shaft 6 is integrated with the rotor shaft 6 by the key 7. Therefore, the key groove 16 formed in the rotor shaft 6 for receiving the key 7 is inserted into the end 1 of the rotor shaft 6.
As shown in FIG. 3, 6A is a step portion 6A of the rotor shaft 6.
4, so that each of the stamped steel plates of the laminated core 8 can be integrated with the rotor shaft 6 via the keys 7.

However, if the end portion 16A of the keyway 16 is formed close to the stepped portion 6A of the rotor shaft 6,
Due to the repetition of impactful torque fluctuations that occur during starting, stopping, load fluctuations, etc., the stepped portion 6A of the rotor shaft 6 and the end 16 of the keyway 16
Stress concentration occurs at A, which makes the rotor shaft 6 prone to breakage, so in order to prevent this in advance, the diameter of the rotor shaft 6 must be made larger than necessary. This inconvenience always occurred.

In view of the above-mentioned prior art, an object of the present invention is to separate the stepped portion of the rotor shaft that locks the laminated core and the keyway that houses the key for integrating the laminated core into the rotor shaft as far as possible. and is equipped with a key that can effectively integrate each stamped steel plate of the laminated core into the rotor shaft, thereby improving the above-mentioned disadvantages of the prior art, and also improving the rotor itself. An object of the present invention is to provide a rotor for a rotating electrical machine that improves productivity.

An embodiment of the present invention will be described below with reference to FIGS. 4 to 7. Here, the same reference numerals are used for the same constituent members as in the prior art described above.

In FIG. 4, the stator 2 has a stator core 4 and a stator coil 5 wound around the stator core 4, just as in the conventional case. Also, rotor 2
Reference numeral 0 indicates a rotor shaft 21 whose both ends are rotatably supported by the stator frame 3, a laminated core 8 configured similarly to a conventional one, and a rotor coil wound around the laminated core 8. 9. This rotor coil 9 includes coil supporting members 10, 10 attached to both sides of the laminated iron core 8, and a bind wire 11 is wound around the outer circumferential portion of the rotor coil 9. As in the prior art described above, the centrifugal force prevents the rotor coil 9 from detaching.

The laminated core 8 of the rotor 20 is prevented from moving at least in the right direction in the figure by the stepped portion 21A of the rotor shaft 21 via the coil support members 10, 10, and is also prevented from moving in the left direction by means not shown. Movement to is stopped. A keyway 26 is formed in the rotor shaft 21 as in the prior art described above, but the distance l between the end 26A of the keyway 26 and the stepped portion 21A of the rotor shaft 21 is 4
As shown in FIGS. 6 to 6, it is set to be relatively large, thereby significantly reducing stress concentration.

The key 27 inserted into the key groove 26 has a shape as shown in FIG. 7 (or FIG. 8). That is, the key 27 is cut off at the lower end 27A, and the cut-off side (lower end side in FIG. 7 or 8) of the key fits into the key groove of the rotor shaft 21 described above. At the same time, the upper end side of the key 27 in the same figure is inserted into the key groove formed in the laminated core 8 and the coil support member 10 in exactly the same manner as in the past. ing.

Therefore, each punched steel plate and coil support member 10 forming the laminated core 8 are integrated with the rotor shaft 21 as shown in FIG. This provides an advantage in that the disadvantages of the prior art described above can be improved.

Rotor shaft 21 in FIGS. 4 to 6 above
Although the keyway 26 is machined using an end mill, it may also be a keyway 36 obtained by milling as shown in FIG. This has the advantage that not only the machining time is significantly shortened, but also the concentration of stress at the stepped portion 21A of the rotor shaft 21 can be further alleviated.

Further, the key 27 shown in FIG. 7 may be constructed so that the lower end surface of the cut-out portion and the lower end surface of the key are continuous as shown in FIG. 8 by a constant curved surface.
By doing so, the invention has the advantage that the durability of the locking key can be increased.

Since the present invention is configured and functions as described above, all of the punched steel plates of the laminated core can be integrated into the rotor shaft via stepped keys. Instead, the thickness of the portion of the coil support member perpendicular to the rotor axis can be made thinner with the intention of alleviating the stress concentration described above.
Therefore, it is possible to replace the coil support member from a conventional die-cast product with a simple press-formed product, and in this respect, it is possible to reduce manufacturing costs. It is possible to provide a rotor for a rotary electric machine that is unprecedented and excellent in that the productivity of the rotor itself can be improved and its durability can be significantly improved.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional front view of a rotating electrical machine equipped with a rotor in the prior art, Fig. 2 is a detailed explanatory view of the stepped portion of the rotor shaft in Fig. 1, and Fig. 3 is a plan view of Fig. 2. 4 is a partially sectional front view of a rotating electrical machine equipped with an example of the rotor according to the present invention, FIG. 5 is an enlarged detailed explanatory view of the stepped portion of the rotor shaft in FIG. 4, and FIG. is the plan view of Fig. 5, and Fig. 7 is the plan view of Fig. 4.
FIG. 8 is an enlarged perspective view of a key in another example, and FIG. 9 is an enlarged detailed explanatory view of a stepped portion of a rotor shaft in another example. 6, 21... Rotor shaft, 6A, 21A... Step portion of rotor shaft, 8... Rotor core, 10... Coil support member as a member for preventing movement of the laminated core in one direction, 16 , 26, 36...Keyway, 16
A, 26A... End of keyway.

Claims (1)

[Scope of utility model registration request] A laminated core for the rotor is provided on the rotor shaft through a keyway formed on the rotor shaft and a key inserted into the keyway, and this laminated core is connected to the rotor shaft on the rotor shaft. In a rotor of a rotating electrical machine, the rotor shaft has a stepped portion that prevents the rotor from moving to at least one side, and the stepped portion of the rotor shaft and the end of the keyway are relatively large. The key which is formed at a distance and inserted into this keyway is a stepped key in which a corner on the rotor shaft side of one end thereof is cut off, and the one end of the stepped key is The stepped key is inserted into the keyway of the rotor shaft so that the remaining portion extends along the rotor shaft toward the step side of the rotor shaft, and the step key on the rotor shaft is A rotor for a rotating electric machine, characterized in that a member for preventing movement of the laminated core in one direction is disposed between the laminated core and the laminated core.