JPH0256021B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a plurality of split cores each formed by laminating a plurality of punched cores each having a plurality of teeth on the inner circumferential side, each end of which is formed into a ring shape in the circumferential direction. This invention relates to a stator core for a rotating electrical machine that is connected and fixed within an outer frame.

Conventionally, in this type of device, a relatively large split core is fixed to the outer frame with a plurality of bolts to ensure the retaining force of the split core in the outer frame.

Split cores were considered to be adopted because of their higher utilization efficiency of core material compared to monolithic cores with small ring-shaped cores punched out on the inner and outer peripheries. This was to be done by signing a contract.

This large number of bolt connections significantly increases the number of work hours, and also increases the resistance of the magnetic circuit.
Moreover, there was a tendency for the cost to be relatively high.

Here, the present invention overcomes the difficulties of conventional devices, and provides a rotating electric machine in which adjacent split cores are engaged by engaging protrusions and engaging recesses provided respectively, and fixation to the outer frame is kept to a minimum. Its purpose is to provide a stator core for

FIG. 1 is a partially omitted plan view of an embodiment of the present invention.

Fig. 2 is a partial plan view showing the state in which the divided cores are engaged with each other, Fig. 3 is a side sectional view taken along line A-A in Fig. 1, and Fig. 4 is a perspective view of one divided core. It is.

1 is an outer frame of the rotating electrical machine, 2 is a mounting bolt for attaching the split core to the outer frame 1, and 3, 4, 5, and 6 are multiple cores made of punched electrical steel plates having multiple teeth 7 on the inner circumference side. This is a split core constructed by laminating layers.

8 is a protrusion where the split core 3 engages with the outer frame 1, 9 is a recess in the outer frame 1, 10 is a bolt hole into which the bolt 2 drilled in the protrusion 8 of the split core 3 is inserted, and 11 is a fixing hole. It is a child coil.

Further, 3-A is an engagement protrusion that engages with the split core 4 of the split core 3, and 3-B is an engagement recess that engages with the split core 6. Note that 4-B is an engagement recess of the split core 4.

The engaging protrusion 3-A of the split core 3 is provided near the mounting bolt 2 (b>a), and this engaging protrusion 3-A is provided near the mounting bolt 2 (b>a).
A engages with the engagement recess of the split core 4, and the split core 4
hold.

The parts of the split core 3 close to the split core 4 are fastened to the outer frame 1 with mounting bolts 2, and the space between the stator and rotor of the rotating electric machine, that is, the split cores 3, 4, 5, 6, A magnet [not shown] for a rotating field is fixed to the outer circumferential surface of the rotor facing each tooth of..., and the magnetic attraction force of the magnet causes the divided cores 3, 4, 5, 6,... is prevented from being sucked in by tightening the plurality of mounting bolts 2. For example, bolt hole 10 of split core 3
Since the mounting bolt 2 is inserted into and fastened to the outer frame 1, the engaging protrusion 3-A is fixed to the outer frame 1,
Since the circumferential joint between the engagement protrusion 3-A and the engagement recess 4-B is not moved by the mounting bolt 2, the split core 4
Even if the engaging recess 4-B becomes cantilevered, it is not attracted toward the inner diameter side.

Generally, in a conventional device, a stator core formed by connecting a plurality of divided cores is divided into divided cores 3, 4, 5,
6,... are arranged to form a ring, so when they are engaged in a ring shape, it is difficult to align the circumferential direction and radial direction between adjacent split cores 3 and 4 due to cumulative dimensional errors due to multiple pieces. The problem was that it was becoming difficult to fit.

However, in the present invention, as is clear from FIG. 2, there is a slight gap between the ends of the engagement protrusion 3-A and the engagement recess 4-B in the circumferential direction. A relief is provided in the circumferential direction at the mating part, that is, the engaging part, of the split cores 3 and 4, and the bolt hole 10 of the screw fastening part drilled in the mounting bolt 2 and the split cores 3 and 4 is provided with a bolt screw. By providing some margin (backlash) because there is usually a slight gap between the two, it is possible to absorb errors in the radial direction between the split cores 3 and 4.

Furthermore, the movement of the portion of the split core 4 near the split core 3 is restricted by the protrusion of the split cores 3 and 6, which are sufficiently fastened with the mounting bolts 2, as shown in FIG.

That is, in the present invention, an engaging protrusion 3-A is formed on the inner circumferential side of one end of each divided iron core (for example, the divided iron core 3), and an engaging recess 3-B is formed on the inner circumferential side of the other end. , and the bolt hole 1 is provided in the engagement protrusion 3-A.
0, and the engaging protrusion 3-A of one split core 3
are engaged with the engagement recesses 4-B of the other split core 4 and connected in a ring shape, and the bolt holes 10 provided in the engagement protrusions 3-A of the respective split cores 3
Insert the mounting bolt 2 into the outer frame 1 and fasten it to the outer frame 1, and the engaging projection 3-A of one split core 3 connects the other split core 4.
The engagement recess 4-B is supported and fixed to the outer frame 1.

Incidentally, a split core protrusion 8 and an outer frame recess 9 are also provided in the engagement between the split core 3 and the outer frame 1 to make it strong.

Depending on the split shape of the split core, the outer frame may be shrink-fitted to the split core without using bolts, so that the outer frame and the split core can be further connected to the split cores 3, 4, 5, etc.
The engaging protrusions 8 of 6, . can be attached to the outer frame 1 very easily.

Thus, according to the present invention, the positioning and attachment of the divided cores to the outer frame can be easily performed, the mutual engagement of the divided cores can be made smooth by the relief in the circumferential direction, and the mutual engagement combination of the divided cores allows This makes it possible to significantly reduce the number of locations where mounting bolts are fastened to the outer frame, and to suppress movement of the split core in the inner radial direction due to the attractive force of the rotating magnetic field.Furthermore, since the split core has the same shape, the shape can be simplified. Naturally, the number of mounting bolts can be significantly reduced, which greatly contributes to shortening the manufacturing process and reducing costs.

[Brief explanation of drawings]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a detailed plan view of the mutually engaging portion of the divided cores, and FIG.
The figure is a side sectional view taken along line A-A in FIG. 1, and FIG. 4 is a perspective view of the split core. 1...Outer frame, 2...Mounting bolt, 3, 4, 5,
6...Split core, 3-A...Engaging protrusion, 3-B,
4-B...Engagement recess, 7...Teeth, 8...Engagement protrusion for the outer frame of the split iron core, 9...Engagement recess for the outer frame to the split core, 10...Mounting bolt insertion Bolt hole for 11...Stator coil.

Claims (1)

[Claims] 1. A plurality of split cores each formed by laminating a plurality of punched cores having a plurality of teeth on the inner circumferential side are connected in a ring shape in the circumferential direction to form an outer frame. In the stator core of a rotating electric machine, a first engagement protrusion is formed on the inner circumference side of one end of the split core, and a first engagement recess is formed on the inner circumference side of the other end of the split core. A second engagement protrusion having a bolt hole formed therein is provided on the outer peripheral surface of the first engagement protrusion of the split core, and a second engagement protrusion of the split core is provided on the inner circumference of the outer frame. A second engagement recess that engages with the outer peripheral surface of the protrusion is provided, and the first engagement protrusion of one split core is connected to the first engagement recess of the other split core to form a ring shape. At the same time, a second engagement protrusion of the split core is engaged with a second engagement recess of the outer frame, and the first engagement protrusion of the one split core engages the other split core. supporting and fixing the first engagement recess to the outer frame, inserting a mounting bolt into a bolt hole provided in a second engagement protrusion of each of the split cores, and fastening the mounting bolt to the outer frame; A stator core for a rotating electric machine, which is characterized by: