JPH11155248A - Rotor - Google Patents

Abstract

(57) [Problem] To provide a rotor using a key which does not require balance adjustment. SOLUTION: A key groove portion of a first laminated core 4a and one of key groove portions of a second laminated core 4b are combined, and the first laminated core 4a is laminated by being sandwiched from both sides by a second laminated core 4b. To form a laminated iron core, and insert a key 3
And the key 3 is fitted and mounted in the key groove portion of the first laminated core 4a of the laminated core. As a result, the unbalanced moment generated by the space in the key groove portion of the laminated core can be canceled, and a highly productive rotor that does not require balance adjustment can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. 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 more particularly to an improvement in imbalance.

[0002]

2. Description of the Related Art In a rotor having a large difference between the outer diameter of an output shaft of a rotary shaft and the outer diameter of a rotor magnet, a laminated iron core acting as a yoke for the rotor magnet may be provided between the rotary shaft and the rotor magnet. As a method of fixing the shaft and the laminated core, a method such as press-fitting, shrink fitting, and bonding is generally used.

[0003] However, when the holding torque cannot be obtained by the above method, a key is provided between the rotating shaft and the laminated core.

In FIG. 4, reference numeral 41 denotes a rotating shaft provided with a key groove, reference numeral 42 denotes a magnet, reference numeral 43 denotes a key, reference numeral 44 denotes a laminated core provided with one key groove, and the rotating shaft 41 and the laminated core 44.
The key 43 is mounted in the key groove portion of the above-mentioned section to secure the holding torque.

At this time, the space portion 45 of the key groove portion of the laminated iron core, which is generated due to the difference in the length of the key 43 and the key groove portion,
When the rotor rotates, an unbalanced moment is generated, so adjustments have been made by attaching a balance putty or removing a part of the laminated core by cutting.

[0006]

However, in the conventional configuration, the balance adjustment by attaching the balance putty or cutting the laminated core deteriorates the productivity of the rotor.
When the thickness of the laminated core is large and the space in the keyway part is large like a large rotor, balance adjustment cannot be performed only by cutting the balance putty or laminated core, or a key longer than necessary must be used. Had the problem of not being able to do so.

The present invention solves the above problems,
An object of the present invention is to provide a rotor using a key, which does not require balance adjustment.

[0008]

In order to solve the above-mentioned problems, a rotor according to the present invention comprises a key, a rotating shaft having a key groove, and a first lamination having one key groove in the center. An iron core, and a second laminated core laminated with a key groove having the same shape as the first laminated core also on the opposite side, wherein the second laminated core is provided in a key groove of the first laminated core. Are laminated together, and the key is attached to the key groove of the first laminated iron core and fixed to the rotating shaft.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to solve the above problems, the present invention provides a key, a rotating shaft having a key groove, a first laminated core having one key groove in the center, and a first laminated core. A first laminated core and a second laminated core laminated on the opposite side with a key groove having the same shape on the opposite side, and one key groove of the second laminated core is provided on the key groove of the first laminated core. Are laminated together, and the key is attached to the key groove portion of the first laminated iron core, and the rotor is fixed to the rotating shaft.

[0010] As described above, the two types of key grooves having two types of key grooves are provided.
A key is mounted in a common key groove portion of various types of laminated cores, and an unbalance moment generated by mounting the key can be reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a rotor according to the present invention will be described with reference to the drawings.

In FIG. 1, 1 is a rotary shaft having a key groove, 2 is a magnet, 3 is a key, 4a is a first laminated core, 4b is a second laminated core, and 5 is a space.

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 As shown in FIG. 3, a core plate having a key groove portion 4d of the same shape is also laminated on the opposite side.

Further, the key groove 4 of the first laminated iron core 4a
c and one of the key groove portions 4c or 4d of the second laminated core 4b, and the first laminated core 4a is sandwiched by the second laminated core 4b from both sides to form a laminated core. The key 3 is mounted on the key groove of the 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.

In this embodiment, the first laminated core 4a is sandwiched between the second laminated cores 4b from both sides. However, the first laminated core 4a and the second laminated core 4b are each one. In this case as well, the key 3 may be similarly laminated and the key 3 may be attached to the key groove 4c of the first laminated iron core 4a.

Further, instead of the magnet, an armature (not shown) may be provided in which pole teeth are provided on the laminated iron core, winding is applied to the pole teeth and connected to a commutator.

As described above, the holding torque during 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]

As is clear from the above embodiment, a key is mounted on a common key groove of two types of laminated cores having two types of key grooves, and the space is defined by the key groove of the laminated core. The generated unbalance moment can be canceled, and a highly productive rotor that does not require balance adjustment can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-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 Rotation axis 3 Key 4a 1st laminated iron core 4b 2nd laminated iron core 4c, 4d Keyway part 5 Space part

Claims (1)

[Claims] 1. A key, a rotating shaft having a key groove, a first laminated core laminated with one key groove in the center,
A second laminated iron core having the same shape as the first laminated iron core on the opposite side, and a second laminated iron core laminated on the first laminated iron core.One of the second laminated iron cores is provided in the key groove portion of the first laminated iron core. A rotor in which the key grooves are aligned and laminated, and the key is mounted in the key groove of the first laminated iron core and fixed to the rotating shaft.