JPH07264823A - Rotor core of permanent magnet synchronous motor - Google Patents

Abstract

PURPOSE:To reduce the manufacturing time of a rotor core by a method wherein grooves for gaps are provided in the outer circumferential parts of magnet incorporating parts beforehand. CONSTITUTION:Grooves 6 of which gaps are composed when the outside diameter of a rotor core is machined are provided between the outer circumferential parts 4 of the permanent magnet incorporating parts 2 of rotor core plates 1C and the holding parts 5 of the core plates 1C which hold the outside circular shapes of the rotor core plates 1C beforehand.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor core of a permanent magnet synchronous motor provided with a predetermined air gap in order to reduce the magnetic flux leaking to the outer periphery of the permanent magnet insertion portion of the rotor core.

[0002]

2. Description of the Related Art Generally, a rotor core of a permanent magnet synchronous motor is provided with a predetermined air gap on the outer periphery of a permanent magnet housing to reduce leakage flux. FIG. 4 is a sectional view showing an example of a conventional rotor core plate, and FIG. 5 is a sectional view showing another example of a conventional rotor core plate. In the figure, 1A and 1B are rotor core plates, 2 is a permanent magnet housing, and 3 is a gap.

A rotor iron core plate 1A shown in FIG. 4 is a divided iron core plate having a predetermined space 3 in a permanent magnet housing 2 and is laminated to form a rotor iron core. A rotor core plate 1B shown in FIG. 5 is a disc-shaped core plate, and after laminating the core plates to form a rotor core, the outer diameter is cut to form a predetermined gap 3
The rotor core was configured so as to be provided with.

[0004]

In the iron core plate having the divided shape as shown in FIG. 4, since the iron core plate is divided, the number of iron core plates increases, and it takes a long time to stack them. Further, in the disk-shaped iron core plate as shown in FIG. 5, since the rotor iron core plate has a disk shape, the lamination time does not take long, but since the rotor iron core is formed, a predetermined gap is provided by another process. However, there is an inconvenience that the cutting of the outer diameter is required and that the processing time is long. The present invention was devised in view of the above-mentioned points, and an object thereof is to reduce the manufacturing time of the rotor core.

[0005]

[Means for Solving the Problems] That is, the means for achieving the object is, in a rotor core of a permanent magnet synchronous motor, an outer peripheral portion of a permanent magnet housing portion of the rotor core plate and an outer diameter of the rotor core plate. A groove that becomes a predetermined gap by cutting the outer diameter of the rotor core is provided in advance between the holding portion for holding the disk shape.

[0006]

The above-described structure has the following effects. The outer diameter cutting process after forming the rotor core is generally performed to make the gap with the stator core uniform, and this cutting process removes the holding part on the outer periphery of the rotor core plate. At the same time, since a predetermined gap is obtained, a cutting process in a separate process is unnecessary. Further, also in the work of laminating the rotor core plates to form the rotor core, the rotor core plates are disc-shaped, so that the workability is good and the manufacturing time is shortened.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a cross-sectional view showing an embodiment of a rotor core plate of the present invention, FIG. 2 is an enlarged view of an A portion showing a main part of FIG. 1, and FIG. FIG. 1C is a perspective cross-sectional view showing a rotor core of the rotor core, 1c is a rotor core plate, 4 is an outer peripheral portion, 5 is a holding portion, 6 is a groove, 7 is an outer diameter, 8 is a finishing outer diameter, and 9 is a permanent magnet. Is. In the figure, the same reference numerals as those in FIG. 4 indicate the same mechanical parts.

As shown in FIGS. 1 and 2, in a rotor core of a permanent magnet synchronous motor, an outer peripheral portion 4 of a permanent magnet housing 2 of a rotor core plate 1c and a disc having an outer diameter 7 of the rotor core plate 1c. A groove 6 is formed in advance between the holding portion 5 for holding the shape and the outer diameter of the rotor core so as to form the predetermined gap 3. Then, after laminating the rotor core plates 1c to form the rotor core, and processing the finished outer diameter 8 after the outer diameter cutting process, the holding portion 5 that holds the disc shape is removed, and the rotor core plate is removed. The groove 6 previously provided in 1c is exposed to obtain a predetermined void 3.

The rotor core plate 1c has a disk shape as shown in FIG. 1, and the laminating work for forming the rotor core can be performed in a short time. FIG. 3 is a perspective sectional view of a main part of the rotor core after the outer diameter cutting process of FIG.
Is shown.

[0010]

As described above, according to the present invention, since the predetermined gap is obtained by cutting the outer diameter of the rotor core, it is not necessary to perform the conventional cutting process to provide the predetermined gap by a separate process. . Further, since the rotor core plate has a disc shape, it can be easily laminated. Therefore, the manufacturing time of the rotor core can be shortened and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a rotor core plate of the present invention.

FIG. 2 is an enlarged view of an A part showing a main part of FIG.

FIG. 3 is a perspective sectional view of an essential part showing a rotor core after outer diameter cutting according to the present invention.

FIG. 4 is a sectional view showing an example of a conventional rotor core plate.

FIG. 5 is a sectional view showing another example of a conventional rotor core plate.

[Explanation of symbols]

 1A Rotor core plate 1B Rotor core plate 1C Rotor core plate 2 Permanent magnet storage part 3 Gap 4 Outer peripheral part 5 Holding part 6 Groove 7 Outer diameter 8 Outer diameter 9 Permanent magnet

Claims (1)

[Claims] 1. In a rotor core of a permanent magnet synchronous motor, between an outer peripheral part of a permanent magnet housing part of a rotor core plate and a holding part for holding a disc shape having an outer diameter of the rotor core plate. A rotor core of a permanent magnet synchronous motor, characterized in that a groove is formed in advance on the rotor core so that a predetermined gap is formed by cutting the outer diameter of the rotor core.