Motor for injection molding machine, rotor of buried magnet motor

Abstract

The utility model relates to a motor for an injection molding machine with good durability, and a rotor of a magnet-embedded motor. On the plate (22) constituting the rotor (20) of the servo motor, the end (25a) from the inner peripheral side of the columnar portion (25) formed between the mutually adjacent holding holes (24) and (24) The part up to the middle part (25c) serves as the holding part (30) in line contact with the permanent magnet (23), and restrains the permanent magnet (23) to prevent it from moving when the servo motor increases or decreases the speed. According to this, the permanent magnet (23) will not hit a specific part of the columnar part (25) even when used for a long time, so that the wear and tear of the columnar part (25) can be prevented, and the durability of the columnar part (25) can be greatly improved. . Here, by filling the gap between the holding portion (30) of the columnar portion (25) and the permanent magnet (23), filling materials such as insulating varnish, adhesive, resin, etc., the holding portion (30) and the permanent magnet (23) can be The gap is blocked. Therefore, even when the speed of the servo motor is increased or decreased, the permanent magnet (23) will not move in the holding hole (24), so that the above effect is more obvious.

Description

technical field [0001] The present invention relates to a motor for injection molding and a rotor of a magnet-embedded motor. Background technique [0002] In recent years, magnet-embedded motors have attracted attention as motors capable of generating high torque despite being small in size. The embedded magnet motor is composed of a rotor with a plurality of permanent magnets arranged on its outer periphery, and a stator provided to face the rotor and provided with coils for generating a magnetic field (for example, refer to Patent Document 1). [0003] FIG. 6 is a structural view showing a rotor 1 of such an embedded magnet motor. As shown in the drawing, the rotor 1 is structured such that a plurality of disc-shaped plates 3 are stacked on its shaft, and permanent magnets 5 are held in holes 4 formed in the plates 3 . [0004] Patent Document 1: Japanese Patent Laid-Open No. 2002-300743 [0005] In the structure of the conventional rotor 1 as described above, the hole...

AI Technical Summary

Problems solved by technology

[0006] In addition, the columnar portion 6 is formed between the holes 4 and 4 in the circumferential direction of the plate 3. However, in a motor whose torque changes greatly during operation of the motor, the permanent magnet 5 will be damaged by the rotor 1 when it increases or decreases. Inertial force moves, especially easy to collide with the end 6a on the inner peripheral side of the columnar portion 6

Therefore, in long-term use, the columnar portion 6 may sometimes be broken at its end 6a.

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