JP3570181B2 - Rotor - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rotor for fastening a rotating shaft and a laminated iron core with a key, and particularly to an improvement in imbalance.
[0002]
[Prior art]
In a rotor having a large difference between the output shaft of the rotating shaft and the outer diameter of the rotor magnet, a laminated core acting as a yoke for the rotor magnet may be provided between the rotating shaft and the rotor magnet. As a fixing method, a method such as press-fitting, shrink fitting, and bonding is generally used.
[0003]
However, when a holding torque cannot be obtained by the above method, a key is provided between the rotating shaft and the laminated core.
[0004]
In FIG. 4, reference numeral 41 denotes a rotating shaft having a key groove, 42 denotes a magnet, 43 denotes a key, and 44 denotes a laminated iron core having one key groove, and a key 43 is mounted in the key groove of the rotating shaft 41 and the laminated iron core 44. Thus, the holding torque is secured.
[0005]
At this time, the space 45 of the key groove of the laminated core, which is generated due to the difference in the length of the key 43 and the key groove, generates an unbalanced moment when the rotor rotates. Was adjusted by removing them by cutting.
[0006]
[Problems to be solved by the invention]
However, in the conventional configuration, the balance adjustment by attaching the balance putty or cutting the laminated core deteriorates the productivity of the rotor. In such a case, there has been a problem that the balance cannot be adjusted only by cutting the balance putty or the laminated iron core, or a key longer than necessary must be used.
[0007]
An object of the present invention is to solve the above-mentioned problem, and to provide a rotor that does not require balance adjustment in a rotor using a key.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, a rotor according to the present invention includes a key, a rotating shaft having a key groove, a first laminated core laminated with one key groove in the center, and the first laminated core. And a second laminated iron core laminated with the same shape key groove also on the opposite side, wherein the key and the key shaft of the rotating shaft and the axial length of the first laminated core are substantially the same size, One of the key groove portions of the second laminated core is aligned with the key groove portion of the first laminated core, and the rotary shaft and the first laminated core are fastened and fixed by the key .
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
In order to solve the above-mentioned problems, the present invention provides a key, a rotary shaft having a key groove, a first laminated core laminated with one key groove in the center, and the same shape as the first laminated core. And a second laminated core laminated on the opposite side with the key groove portion of the first side, and the key and the key groove portion of the rotating shaft and the first laminated core have substantially the same axial length, and A rotor in which one of the key grooves of the second laminated core is aligned with a key groove of the laminated core of the first and second laminated cores, and the rotary shaft and the first laminated core are fastened and fixed by the keys .
[0010]
As described above, the key is mounted on the common key groove of the two types of laminated cores having the two types of key grooves, and the unbalance moment generated by mounting the key can be reduced.
[0011]
【Example】
Hereinafter, the rotor of the present invention will be described with reference to the drawings.
[0012]
In FIG. 1, reference numeral 1 denotes a rotary shaft having a key groove, 2 denotes a magnet, 3 denotes a key, 4a denotes a first laminated core, 4b denotes a second laminated core, and 5 denotes a space.
[0013]
As shown in FIG. 2, the first laminated core 4a is formed by laminating a core plate having one key groove 4c at the center, and the second laminated core 4b is formed as shown in FIG. As described above, a core plate having a key groove portion 4d of the same shape is also laminated on the opposite side.
[0014]
Further, the key groove portion 4c of the first laminated core 4a and one of the key grooves 4c or 4d of the second laminated core 4b are combined, and the first laminated core 4a is sandwiched between both sides of the second laminated core 4b. The laminated core is formed by lamination, the key 3 is mounted on the key groove of the rotating shaft 1, and the key 3 is fitted and mounted on the key groove 4c of the first laminated core 4a of the laminated core.
[0015]
In this embodiment, the first laminated core 4a is described as being sandwiched between the second laminated cores 4b from both sides. However, the first laminated core 4a and the second laminated core 4b are each constituted by one piece. In this case as well, the key 3 may be attached to the key groove 4c of the first laminated iron core 4a in the same manner.
[0016]
Further, instead of a magnet, an armature (not shown) in which pole teeth are provided on a laminated iron core, winding is applied to the pole teeth, and the pole teeth are connected to a commutator.
[0017]
As described above, the holding torque at the time of rotation of the rotating shaft and the laminated core can be secured, and at the same time, the space of the key groove can be made symmetrical, so that the unbalance moment can be minimized.
[0018]
【The invention's effect】
As is clear from the above embodiment, the key is mounted on the common key groove of the two types of laminated cores having two types of key grooves, and the unbalanced moment generated by the space of the key groove of the laminated core is reduced. It is possible to obtain a highly productive rotor that can be canceled and does not require balance adjustment.
[Brief description of the drawings]
1 is a sectional view of a rotor according to an embodiment of the present invention; FIG. 2 is a plan view of a first laminated core; FIG. 3 is a plan view of a second laminated core; FIG. 4 is a sectional view of a conventional rotor; [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotating shaft 3 Key 4a First laminated core 4b Second laminated core 4c, 4d Keyway 5 Space

Claims (1)

A key, a rotating shaft having a key groove, a first laminated core laminated with one key groove in the center, and a key groove having the same shape as the first laminated core also provided on the opposite side and laminated. A keyed portion of the key and the rotary shaft and the axial length of the first laminated core are substantially the same size, and the keyway of the first laminated core is provided with the second laminated core. A rotor in which one keyway portion of a laminated core is aligned and laminated, and the rotation shaft and the first laminated core are fastened and fixed by the key .

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