JPH0134526Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a stator core of a rotating electric machine, and particularly relates to an improvement in assembly.

[Prior art]

In general, a stator is made of laminated stator core blanks and a predetermined winding is applied to the slots of the stator, a rotor is disposed to face the stator, and a permanent magnet material is disposed on the rotor. In the case of electric motors, there is a sudden change in the magnetic flux distribution between the slots of the stator core and the teeth between the slots, which leads to poor magnetic flux formation and uneven rotation of the rotor. It is becoming. For this reason, after stacking a predetermined number of stator core blanks, the outer periphery of the stator core is twisted to eliminate uneven rotation. For this reason, the outer periphery of the stator core punched conventionally has a circular shape so that the outer periphery can be twisted.

However, this type of electric motor is often used as a drive motor for industrial robots, and from the standpoint of use, there is a strong demand for smaller size and lighter weight. Therefore, the outer periphery of the stator core punched out has a rectangular shape to make it smaller and lighter. I needed to measure it. However, if the outer periphery of the stator core punched is made into a rectangular shape and the outer periphery is twisted, the external shape will be uneven and the corners of the outer periphery of the stator core punched will become an obstacle. The drawback was that it could not be fixed with a clamping bolt, impairing the ease of assembling the product.

[Summary of the idea]

This idea was made in order to eliminate the above-mentioned drawbacks, and the stator core is made by shifting the position of the notch in each punched stator core by a predetermined angle in one direction for each punched piece. The object of the present invention is to provide a rotating electric machine in which the slots of the core are skewed by stacking the blanks to a predetermined width of the core, improving the assemblability of the product and preventing uneven rotation.

[Example of idea]

An embodiment of this invention will be described below with reference to FIGS. 1 to 5.

In the figure, 1 is the anti-load side bracket, 2 is the load side bracket, and the anti-load side bracket 1,
A bearing 10 is fitted into the bearing portion of the load-side bracket 2 to pivotally support the rotating shaft 9. 3 is a stator which includes the anti-load side bracket 1 and the load side bracket 2.
The stator 3 is clamped and fixed with bolts, and a stator coil 6 is attached to the stator 3. 4 is a stator core, and this stator core 4 has a plurality of stator core punches 4a,
4b...4n are stacked. These stator core punches 4a, 4b...4n have a rectangular external appearance with a plurality of notches provided on the inner periphery, and these stator core punches 4a, 4b...4n
The positions of the notches are as shown in FIGS. 2 to 5, and each punched sheet is rotated by a predetermined angle .theta..degree. in the same circumferential direction. A rotor 7 is divided in the circumferential direction of the rotor 7 and is polarized in a shape parallel to the axial direction, and a permanent magnet material such as fluorite, alnico, or clay magnet is arranged to form a permanent magnet 8. There is. This rotor 7 faces the stator 3 with a predetermined space therebetween, and is fixed to the rotating shaft 9.

Here, when a three-phase AC power source is connected to the stator winding 6 of this motor and power is supplied, a rotating magnetic field is generated in the stator 3. The magnetic poles of this rotating magnetic field and the permanent magnets 8 constituting the rotor 7 attract and repel, causing the rotor 7 to rotate and the rotating shaft 9 to rotate.

In this way, stator core punching 4a, 4b...4n
Since each of the stator core punches is pressed and rotated by θ° relative to the external shape, when these stator core punches are stacked to have a predetermined core width, the notches 5 are skewed and fixed. This results in a state similar to that in which the outer periphery of the child core 4 is twisted.

Here, if we show the shift angle (rotation angle) of the stator core punched slots, then if the number of laminated stator core punches is N, the number of slots is n, and the diagonal slot ratio is α (usually 1.0), then The angle (rotation angle) θ° is expressed as θ°=360/N×n×α.

[Effect of idea]

As mentioned above, each stator core punched 1
Each sheet is punched with the notch position shifted by a predetermined angle in the same direction in the circumferential direction, and the slots are skewed by stacking them to a predetermined width, eliminating the need to twist the outer periphery of the stator core. As a result, the outer periphery of the stator core becomes orderly, and there is no problem with assembly, and it is possible to obtain a stator core for a rotating electrical machine that can be easily assembled as a product.

[Brief explanation of the drawing]

The figures are for explaining a rotating electrical machine according to an embodiment of the invention, in which FIG. 1 is a half-sectional view of the motor, and FIGS. 2 to 5 are front views of the stator core punched out. In the figure, 3 is a stator, 4 is a stator core, 4
a, 4b, 4c, and 4d are stamped stator cores, 5 is a notch, 6 is a stator winding, 7 is a rotor, and 8 is a permanent magnet.

Claims (1)

[Scope of Claim for Utility Model Registration] Consisting of a large number of laminated stator core blanks each having a large number of U-shaped notches on the inner periphery, and formed by sequentially overlapping the cutouts of each punch in series. In a stator core for a rotating electric machine, which has a large number of slots in which stator windings are housed, and in which the outer circumferential shape of the stator core punching is a square shape, the stator core punching described above has the following characteristics: The slots on the inner periphery of adjacent stator core punches are 360/N×n×α (N: number of laminated cores, n: number of slots,
A stator for a rotating electrical machine, characterized in that it is formed by punching so as to be offset in the same direction in the circumferential direction at an angle of α: diagonal slot ratio), and is formed by stacking a large number of sheets in sequence so that the slots are skewed. Iron core.