JP2000069727A - Rotor of motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the rotor of a motor which has a reduced number of components to reduce the material cost, reduce the assembly man-hours and improve the productivity. SOLUTION: The rotor 1 of a motor is composed of a cylindrical rotor core 2 composed of layered circular silicon steel plates, field magnet segments 4 fitted into a plurality of attachment holes 2b which are formed in the rotor core 2 near its outer circumference, a rotary shaft 3 inserted through an insertion hole 2a formed in the rotor core 2 at its center and side plates 5 which are made of nonmagnetic material and attached to both the ends of the rotor core 2. One of the side plates 5 is a disc which is made of stainless steel by casting so as to make a part of it to be a balance weight part 5a which has different thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a motor rotor, and more particularly, to an unbalanced structure of a rotor core.

[0002]

2. Description of the Related Art FIG. 4 is a front view showing an example of a conventional motor rotor, FIG. 5A is a left side view showing an example of a conventional motor rotor, and FIG. 5B is a right side view. Conventionally, taking a rotor 1 of a brushless motor as an example, a circular steel plate having a plurality of mounting holes 2w for magnet pieces in the vicinity of the outer periphery is laminated to form a cylindrical rotor core 2, and the mounting hole 2 of the rotor core 2 is formed.
A plate-shaped field magnet piece 10 is inserted into w.

[0003] An insertion hole 2a is formed at the center, a rotary shaft 3 is inserted through the insertion hole, and non-magnetic side plates 5, 6 are attached to both ends of the rotor core 2.
The balance weight 10 was attached to the apparatus.

However, since the balance weight 10 is attached to the one side plate 5, the number of parts is large, the cost of materials and the number of attachment steps are increased, and there is a possibility that it becomes an obstacle to cost reduction, which is a problem.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and reduces the number of parts of a motor rotor, thereby reducing material costs, reducing the number of mounting steps, and improving productivity. It is an object to provide an improved motor rotor.

[0006]

In order to achieve the above object, circular steel plates having a plurality of mounting holes for magnet pieces near the outer periphery are laminated to form a columnar rotor core, and the plate is inserted into the mounting holes of the rotor core. In the rotor of a motor in which a field-like magnet piece for a field is inserted and side plates made of a non-magnetic material are attached to both ends of the rotor core, one of the side plates is partially balanced by casting to change the thickness. It is made to be a disk on which weights are formed.

The thickness of the balance weight portion is made thicker than the others.

Alternatively, the thickness of the balance weight portion is made thinner than the others. Further, the material of the side plate is stainless steel or brass.

On the other hand, the side plate is attached to the rotor core by caulking pins. Then, the thickness of the side plate at the mounting position of the caulking pin is made the same, and the length of the caulking pin is made the same.

[0010] Alternatively, the balance weight portion is formed on the outer peripheral portion of the side plate, and the caulking pin is attached inside the unbalance weight position.

Alternatively, the balance weight portion is
The caulking pin is formed from between a plurality of mounting positions to the outer peripheral portion of the side plate.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail based on embodiments with reference to the accompanying drawings. FIG. 1 is a front view of an embodiment showing a rotor of a motor according to the present invention.
1 is a left side view of one embodiment showing a rotor of a motor according to the present invention. Here, the same reference numerals are used for the same parts as in the conventional example.

A plate-shaped field magnet piece 4 is mounted in a plurality of mounting holes 2b formed in the vicinity of the outer periphery of a cylindrical rotor core 2 made of a silicon steel plate formed by laminating circular steel plates. At the same time, an insertion hole 2a is formed at the center, the rotary shaft 3 is inserted into the insertion hole 2a, and side plates made of a non-magnetic material are attached to both ends of the rotor core 2 to configure the rotor 1 of the motor.

Here, one of the side plates 5 is formed into a disk having a balance weight formed by changing a part of the thickness by casting using stainless steel. Also,
The balance weight portion 5a is formed on the outer peripheral portion of the side plate 5, and the caulking pin 7 is mounted inside the unbalance weight position. The thickness of the balance weight portion 5a is made thicker than the others.

On the other hand, the side plate 5 is attached to the rotor core 2 by caulking pins 7. The thickness of the side plate 5 at the mounting position of the caulking pin 7 is made the same, and the length of the caulking pin 7 is made the same.

Here, the operation and effect of the present invention will be described. Since the balance weight portion 5a is formed integrally with the outer peripheral portion of the side plate 5, the balance weight portion 5a is not formed as a separate part, the number of parts is reduced, and the number of mounting steps is reduced. For this reason, rotor assembly of the motor becomes easy.

Further, since stainless steel is used for the side plate 5, the action can be further enhanced without increasing the thickness difference of the balance weight. Furthermore, since the length of the caulking pins 7 can be made the same, the number of parts does not increase.

FIG. 3 is a left side view of another embodiment of the rotor of the motor according to the present invention. As in this example,
The balance weight portion 5a may be formed between a plurality of mounting positions of the caulking pin 7 toward the outer peripheral portion of the side plate 5.

The balance weight portion 5a may be made thinner than the others. Also,
The side plate 5 may be made of brass.

[0020]

As described above, in the present invention, a circular rotor core is formed by laminating circular steel plates having a plurality of mounting holes for magnet pieces in the vicinity of the outer periphery, and a plate-like boundary is formed in the mounting hole of the rotor core. In a rotor of a motor in which magnet pieces for magnets are inserted and side plates made of a non-magnetic material are attached to both ends of the rotor core, one of the side plates is partially changed in thickness by casting to form a balance weight. It was made into a disc. As a result, it is possible to provide a motor rotor in which the material cost of the motor rotor is reduced, the generation of vibration and noise is reduced, and the efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a front view of one embodiment showing a rotor of a motor according to the present invention.

FIG. 2 is a left side view of one embodiment showing a rotor of the motor according to the present invention.

FIG. 3 is a left side view of another embodiment showing the rotor of the motor according to the present invention.

FIG. 4 is a front view showing an example of a rotor of a conventional motor.

FIG. 5A is a left side view showing an example of a conventional motor rotor, and FIG. 5B is a right side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotor 2 Rotor core 2a Insertion hole 2b Mounting hole 3 Rotating shaft 4 Magnet piece 5 Left side plate 5a Balance weight part 6 Right side plate 7 Caulking pin

Claims (8)

[Claims] 1. A cylindrical rotor core is formed by laminating circular steel plates having a plurality of mounting holes for magnet pieces near the outer periphery, and a plate-shaped field magnet piece is inserted into the mounting holes of the rotor core. In a rotor for a motor having side plates made of a non-magnetic material attached to both ends of the rotor core, one of the side plates is formed as a circular plate having a balance weight formed by changing a part of the thickness by casting. The rotor of the motor. 2. The motor rotor according to claim 1, wherein a thickness of the balance weight portion is larger than others. 3. The motor rotor according to claim 1, wherein the thickness of the balance weight portion is made thinner than the others. 4. The motor rotor according to claim 1, wherein the side plate is made of stainless steel or brass. 5. The rotor for a motor according to claim 1, wherein said side plate is attached to said rotor core by caulking pins. 6. The motor rotor according to claim 1, wherein the thickness of the side plate at the mounting position of the caulking pin is the same, and the length of the caulking pin is the same. 7. The motor according to claim 1, wherein the balance weight portion is formed on an outer peripheral portion of the side plate, and the caulking pin is attached inside the balance weight position. Rotor. 8. The motor rotor according to claim 1, wherein the balance weight portion is formed between a plurality of mounting positions of the caulking pin toward an outer peripheral portion of the side plate.