JPH0297242A - Pole core fixing structure for rotary machine - Google Patents

Abstract

PURPOSE:To improve balance of flux distribution by forming a fitting section in the central section of a pole core and providing a section engageable with the fitting section on a frame thereby fixing the pole core accurately to the frame with no shift from the center. CONSTITUTION:Since a fitting section 9 formed in the central section of a pole piece 8 fits to the engaging section 12 of a laminate frame 11, the pole piece 8 can be fixed accurately to the laminate frame 11 with no shift and the balance of flux distribution is improved. Furthermore, since the contact area between the pole piece 8 and the laminate frame 11 increases by the amount of two oblique sides of a trapezoid formed by the fitting section 9 and the engaging section 12, magnetic resistance scarcely unbalances and fluctuation of the capacity of rotary machine is eliminated. Consequently, desired speed characteristics can be realized easily and the reliability of machine is improved. Furthermore, withstandability against magnetic vibration is improved and trouble is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic pole core mounting structure for a rotating machine.

[Prior art] Generally, a laminate frame (Utility Model Publication No. 61-34838
The mounting structure of the magnetic pole core of a conventional rotating machine using a rotary machine (see Japanese Patent Publication No. 2003-110001) is shown in FIG. 3.

That is, the pole piece 1 required for the magnetic pole core is constructed by punching thin silicon steel plates (or electromagnetic steel plates), stacking them in the axial direction, and welding the required parts.

A field winding (not shown) is wound around this magnetic pole core. In addition, the upper surface is arranged on the inner surface of a cylindrical laminate frame 2, which will be described later.
The lower surface forms an arc concave inward so as to face the armature 6 via the air cap.

On the other hand, the laminate frame 2 is constructed by laminating frame handling plates in the axial direction. This laminate frame 2 is formed with an insertion hole 5 into which the pole l-3 engages, and a screw hole 4 is bored in the vertical direction in the center of the pole piece 1 so that the bolt 3 can be inserted therethrough. There is. By installing the bolts 3 into such screw holes 4 and insertion holes 5, the pole piece 1 and the laminate frame 2 are
Tightened and fixed.

However, in the conventional example having the above configuration, the a5
The following J and Una issues were pointed out.

In other words, when the poles I to 3 are installed in the screw hole 4, the insertion hole 5 is a blank hole, so the pole piece 1 may shift from the center in the axial direction. , the magnetic flux distribution was unbalanced. Furthermore, if the pole piece 1 shifts from side to side, the air gap between the magnetic pole piece 1a at the tip of the pole piece 1 and the outer periphery of the armature 6 becomes uneven, causing magnetic vibration. There was also a risk of contact. In addition, disturbances occur in the distribution of magnetic flux,
In particular, in the case of a DC machine, since the magnetic flux and the rotation of 38 degrees are inversely proportional, desired speed characteristics cannot be obtained, which reduces the reliability of the machine.

Further, if a gap is created between the contact portions of the ball screw 1 and the laminate frame 2 due to an error in stacking the punched plates of the pole piece 1 and the laminate frame 2, the contact area will be reduced. Therefore, the magnetic resistance to the magnetic flux passing between the pole piece 1 and the laminate frame 2 was likely to change, resulting in many unbalanced magnetic resistances. This imbalance in magnetic resistance also degrades the performance of rotating machines.

Problem 7 to be solved by the invention U As mentioned above, in the conventional technology, the magnetic pole core is blurred,
Imbalance was likely to occur in magnetic flux distribution and magnetic resistance, and it was also weak against magnetic vibration. The present invention was proposed to solve such problems, and its purpose is to improve the number of magnetic pole cores (q It's about providing structure.

"Means for Solving the Problems" In order to solve the above-mentioned problems, the magnetic pole core mounting structure of the rotating machine of the present invention forms a fitting part in the center of the magnetic pole core, and attaches the fitting part to the frame. A structural feature is that it includes an engaging portion that matches the mating portion.

[Function] The function of the present invention having the above configuration is as follows.

That is, since the fitting part formed at the center of the magnetic pole core matches the engaging part of the frame, the magnetic pole core can always be accurately attached to the frame so that it does not shift from the center.
The magnetic flux distribution is well balanced.

Furthermore, since the contact area between the magnetic pole iron core and the frame is narrowed, unbalanced magnetic resistance is less likely to occur. Therefore, it is easy to obtain desired speed characteristics without variations in the function of the rotary machine, and the reliability of the equipment is improved.

Furthermore, since the magnetic pole core and the frame itself are interlocked, it is resistant to magnetic vibrations and has fewer failures.

[Example] An example of the present invention described above will be specifically described with reference to the drawings.

Incidentally, the same reference numerals are given to the same members as in the prior art, and the description thereof will be omitted.

That is, as shown in FIG. 1, the pole piece 8 has a trapezoidal fitting portion 9 recessed downward in the center thereof, which is shorter than the bottom force or the top force. Bottom part 9 of this fitting part 9
A is provided with a screw hole 10 into which the bolt 3 is engaged. Note that the depth of this screw hole 10 is only the depth of the screw hole 4 shown in the conventional example minus the depth of the fitting part 9, so the bolt 3 has the same length as in the conventional example. can be used.

On the other hand, the contact portion of the laminate frame 11 with the pole piece 8 is provided with a trapezoidal engaging portion 12 that projects downward so as to match the fitting portion 9 of the pole piece 1. At the center of this engaging portion 12 is an insertion hole 13 into which the bolt 3 is inserted.
is formed.

In this embodiment having such a configuration, the pole piece 8 and the laminate frame 11 are engaged while the fitting part 9 and the engaging part 12 are made to match. Then, insert bolt 3 into screw hole 10.
, the pole piece 8 and the laminate frame 11 are fixed to each other through the insertion hole 13.

The operation of the magnetic pole core mounting structure of this embodiment as described above is as follows.

That is, since the fitting part 9 formed at the center of the pole piece 8 matches the engaging part 12 of the laminate frame 11, it is possible to always accurately attach the pole piece 8 to the laminate frame 11 so that it does not shift from the center. The magnetic flux distribution is well balanced.

Roughly speaking, since the contact area between the pole piece 8 and the laminate frame 11 is wider than the two trapezoidal hypotenuse valves forming the fitting part 9J5 and the engaging part 12, unbalance of magnetic resistance is less likely to occur and the performance of the rotating machine is improved. No J will be able to pass it on. Therefore, it is easy to obtain desired speed characteristics, and the reliability of the device is improved.

Moreover, since the pole piece 8 and the laminate frame 11 themselves are fitted together, it is strong against magnetic vibrations and has fewer failures.

Incidentally, the present invention is not limited to the above-described embodiment, but can be applied to two chevron-shaped fitting portions 1 as shown in FIG.
4 and the engaging portion 15, as long as the fitting portion and the engaging portion of the magnetic pole core and the frame match, and their shapes, dimensions, etc. can be selected as appropriate.

Furthermore, in the present invention, if the magnetic pole core and the frame are made into a predetermined shape by using, for example, a magnetic steel plate of the same thickness and are shaped into a predetermined shape, both can be punched out in the same manner. etc., conventional ones can be used, and the manufacturing cost is also advantageous.

[Effects of the Invention] As described above, according to the magnetic pole core mounting structure for a rotating machine of the present invention, a fitting portion is provided on the magnetic pole core, and an engaging portion that matches the fitting portion is formed on the frame. With a simple configuration,
Attach the magnetic pole core accurately to the frame so that it does not shift from the center (can be bent), has a well-balanced magnetic flux distribution, and
Because the contact area between the magnetic pole core and the frame is small, unbalanced magnetic resistance is less likely to occur, and it is also resistant to magnetic vibration, making it a highly reliable rotating machine with higher manufacturing costs than conventional machines. We can provide the magnetic pole core mounting structure.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of this embodiment, FIG. 2 is a vertical cross-sectional view of a main part of another embodiment, and FIG. 3 is a vertical cross-sectional view of a main part of a conventional example. 1... Pole piece, 2... Laminate frame,
3... Hole l ~, 4... Screw hole, 5... Insertion hole,
6... Armature, 7... 4-pole flow machine, 8... Pole piece, 9... Fitting part, 10... Screw hole, 11...
- Laminate frame, 12... engaging portion, 13...
Insertion hole, 14...fitting part, 15...engaging part.

Claims (1)

[Scope of Claims] A magnetic pole core mounting structure for attaching a magnetic pole core of a rotating machine to a frame, wherein a fitting portion is formed at the center of the magnetic pole core, and the frame is provided with an engaging portion that matches the fitting portion. A magnetic pole core mounting structure for a rotating machine that has the following structural features.