Permanent magnet motor, hermetic compressor and refrigeration cycle device

Abstract

The invention provides a permanent magnet motor, a hermetic compressor and a refrigeration cycle device, can realize an increase of total length of permanent magnets accommodated in magnet accommodating holes, and can realize decrease of parts which are difficult to magnetize. The permanent magnet motor includes a stator having a stator coil, and a rotor (11), and the permanent magnets are accommodated in the plurality of magnet accommodating holes (14) arranged on a rotor core (12). The magnet accommodating holes (14) have arc-shaped accommodating parts (14a) whose convex part side is toward a center (O) side of the rotor core (12) when overlooked, and linear accommodating parts (14b, 14c) formed at tow end sides of the arc-shaped accommodating parts (14a), arc-shaped permanent magnets (16) are accommodated in the abovementioned arc-shaped accommodating parts (14a), and tabulate permanent magnets (17a, 17b) are accommodated in the abovementioned linear accommodating parts (14b, 14c).

Description

technical field [0001] Embodiments of the present invention relate to a permanent magnet motor, a hermetic compressor, and a refrigeration cycle device. Background technique [0002] Conventionally, it is known that a permanent magnet motor is used as a driving source of a hermetic compressor in a refrigeration cycle apparatus. [0003] Generally, such a permanent magnet motor includes: a stator having a fixed coil; and a rotor in which permanent magnets are accommodated in a plurality of magnet accommodation holes provided in the rotor core. [0004] Such as Figure 9 As shown, as an example of the rotor 1 of a conventional permanent magnet motor, there is known a rotor in which a shaft hole 3 for inserting a rotating shaft (not shown) around a cylindrical rotor core 2 is known. A plurality of magnet receiving holes 4, 4, . In each of the magnet housing holes 4, there are respectively accommodated Figure 10 The two planar permanent magnets 5, 6 of parallel magnetic fiel...

AI Technical Summary

Problems solved by technology

[0006] However, in the above Figure 9 In the conventional rotor shown, since two flat-plate permanent magnets 5 and 6 are accommodated in each V-shaped magnet accommodation hole 4, there is a problem that the magnet accommodation hole 4 faces the shaft hole. On the side of the V-shaped tip on the center O side of 3, a space 4a where there are no permanent magnets 5 and 6 is formed.

[0007] That is, the widthwise inner end sides of the flat permanent magnets 5 and 6 housed in the V-shaped magnet housing holes 4 abut and interfere with each other at the V-shaped tip of the magnet housing holes 4, so that they cannot be changed. Inserting it further toward the center O side forms a roughly triangular space 4a

[0008] Therefore, the total length of the two permanent magnets 5 and 6 accommodated in each magnet housing hole 4 is shortened, and accordingly, the magnetic flux of the rotor 1 decreases, resulting in a decrease in performance as a permanent magnet motor.

[0009] Moreover, there is also a problem that, in each of the magnet housing holes 4, raw materials before being magnetized into permanent magnets 5 and 6, for example, planar raw materials such as ferrite (ferrite) are stored, and when viewed from the outer peripheral side of the rotor 1 When a magnetizing machine with substantially the same structure as the stator is applied with a magnetic field for magnetization, not only the above-mentioned space portions 4a of the magnet housing holes 4, 4, . . . The deep part of the center O side of the shaft hole 3 is far away from the magnetizer, so it is also difficult to magnetize

[0010] Therefore, the magnetic flux of the rotor 1 is reduced, which leads to a decrease in performance as a permanent magnet motor

[0011] Moreover, the rotor described in Patent Document 1 is also in a substantially trapezoidal magnet housing hole, and the flat permanent magnets are respectively accommodated at three positions of the top side of the trapezoid and the hypotenuses on both sides of the trapezoid. It is easy to create a gap between the three permanent magnets

[0012] Therefore, there is substantially the same problem as that of the prior art having the above-mentioned V-shaped magnet accommodating hole.

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