JPS6198141A - Balancer device for dynamo-electric machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to modifying the armature of a dynamo electric machine to generate a better rotational balance during operation of the dynamo electric machine. - A device called C.

In particular, it relates to a device adapted to insert a predetermined mass of material into a predetermined slot of a dynamoelectric machine armature to improve rotational balance.

Dynamo electric machines, such as the motors used in automobile wiper control systems, generate audible noise during operation. If this noise is too noticeable inside the vehicle, it will be unpleasant for both the driver and passengers. According to recent trends in automobile design.

In many cases, windshield wiper motors are located closer to the occupants and sound insulation is also reduced.

Therefore, the noise does not decrease. Furthermore, if the windshield wiper system uses a pair of electronically synchronized motors, the increased number of motors also increases noise.

Analysis of the audible noise generated by motors with typical armature windings has shown that the primary source of noise is rotor or armature imbalance. In the manufacture of large such motors, the degree of armature unbalance, and therefore the amount of audible noise, varies from motor to motor, with a normal bell curve resulting in some very well balanced armatures and some unacceptable balanced ones. It was found that it can be statistically expressed by the armature of Since a significant portion of the cost of a completed motor is contained in the completed armatures, it is desirable that these armatures be balanced on the lower side of the curve. Traditionally, to do this, you take the armature off the assembly line and
They were balanced at another location before being returned to the assembly line. One method of actually adjusting the balance state of an armature is to determine whether mass needs to be added to bring this armature into an acceptable balance state, and then
A length of insulated wire is inserted from the end of the armature into one of the armature slots and held between the winding and the armature pole pieces.

However, this is basically a manual process, and it takes a long time to balance a large number of armatures running on one assembly line. In the future, this type of balancing adjustment will become impractical if noise regulations are tightened and balancing operations must be performed on a large number of armatures in the central portion of the statistical bell curve. However, there are problems with the well-known alternatives to this operation, such as removing the total deflection from the thin layers or adding solder or other materials where the armature would be.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a device for balancing dynamo electric machine armatures that can be incorporated into an automated assembly line to quickly balance armatures in large-scale production.

To this end, the dynamoelectric mechanical armature balancing device according to the invention is characterized by the features set out in the characterizing part of claim 1.

As before, the invention uses a piece of cable cut to a predetermined length and inserted into a slot determined to optimally balance the armature. However, in the present device, the cable piece is inserted radially through the slot. If the cable is a hot wire, the outer insulation sheath is compressed into the slot and then expanded to retain the cable within the slot. Alternatively, the cable may be made of a single piece of material 6 of a diameter small enough to fit into the slot, and the device deforms and retains it within the slot. Alternatively, or in addition, an adhesive may be used to hold the cable within the slot, or the cable may be embedded within the material of the slot and subsequently cured.

The invention comprises a device adapted to hold an armature;
a device adapted to pass a wire parallel to and adjacent to one of the slots and past the shear edge to the length required for balancing the armature by insertion into the slot; a bar that abuts substantially its entire length from its free end to its shear edge and is operative to force the wire radially into the armature slot to cause it to be severed from the body of the wire by its shear edge; The inventive device may have a single wire fed from one direction, or it may feed two wires from opposite directions within the same slot, controlling the length of wire inserted at each end of the slot. Fineness balance control may also be performed. The device may be sent to one slot at a time.

It may be sent to multiple slots at the same time. Since the wires are inserted into the slots from a radial direction, the armatures can be successively threaded through the installation and the desired slots properly oriented by common assembly line equipment, automating the entire process for maximum productivity. I can do it.

Preferred embodiments of the invention will now be described with reference to the accompanying drawings.

Referring to FIGS. 1 and 2, a cable 10 containing an inner core 11 of gold A-wire surrounded by a compressible outer sheath 12 is routed through a circular opening 13 in a cable guide 14. Obviously, other types of cables may be used as described above, but this type of cable is described in this example. The cable 10 is connected to the shaft 17 by a step motor 18.
The drive wheel 16 and the splashing device 2 are rotated via the
2 between the idler wheels 20 on the idler shaft 21 which are biased towards the cable 10 by 2. The adjusting nut 23 adjusts the biasing force l'lI! applied by the idler wheel 20 to the drive wheel 16 via the cable 10! Perform 1 verse and step mode 1
8 to ensure that the cable 10 can be advanced over a predetermined distance.

Cable 10 connects drive wheel 16 and idler wheel 2
0 through the circular opening 25 of the cable guide 26 and the circular opening 28 of the upper clamping block and cable guide 29. The upper clamp block/cable guide 29 has a single arc-shaped clamping surface 30 as shown in FIG. 3, and this clamping surface supports the armature downward when lowered onto the dynamo electric machine armature 32. Block 34
It is held against the upper arcuate tightening surface 33 of. Tightening surface 30
．． The portion of armature 32 that is clamped between 33 is the outer surface of the laminated pole. This pole is made of laminated iron and can be held without damage to itself or other parts of the armature.

Lower support block 34 includes one or more anti-rotation elements 36 that project upwardly from lower support block 34 into slots in armature 32 to prevent armature 32 from rotating when tightened. It is designed not to. The anti-rotation element 36 may be in the form of a number of pins, as shown in FIG. 1, or may be in the form of an elongated blade oriented axially with respect to the armature 32.

In combination with the upper clamp block and cable guide 29 is an upper ram assembly 40 which includes one or more insertion bars 41. These insertion bars fit into the openings 42 in the upper clamping block and cable guide 29.
and is axially aligned with the uppermost slot of armature 32 when the lowermost slot is secured by anti-rotation element 36 . The cable 10 is routed between the lower surface 4, 3 of the insertion bar 41 and the uppermost slot of the armature 32. The slot is designated by reference numeral 4 in Figures 4 and 5.
It is indicated by 5. The upper clamp block and cable guide 29 and the insertion bar 41 are interconnected within the upper ram assembly 40 and the upper clamp block and cable guide 29 is interconnected within the upper ram assembly 40.
9 descends and firmly tightens the armature 32, after which the insertion bar 41 continues to descend, so that the cable 1o
Part of the upper clamp block and cable guide 2
It is cut from the cable body by means of an insertion bar 41 cooperating with the shearing edge 46 of 9, and this cut cable part is then pushed into the slot 45, as can be seen in FIG.

Compressible outer sheath 12 of cable 10 allows cable 1
0 can be inserted into slot 45. core 11
This is because the outer diameter of the slot 45 is smaller than the width of the opening of the slot 45. However, the normal outer diameter of the compressible outer sheath 12 of the cable 10 is wider than the opening of the slot 45, so that once the cable 10 is inserted, slot 4
5.

For operation, transfer mechanism (Fig.

Although not shown, it should be understood that the lower support block 34 includes rails extending in and out of the plane of FIG. advance until. The balance test device measures the balance condition of the armature 32 and orients the armature so that the slots 45 that require additional material are oriented vertically upward. vri
The armature 32 is placed on a lower support block 34 with a slot diametrically opposed to the slot 45 requiring addition of material above the anti-rotation element 36. The cable 10 is fed into the clamp block and cable guide 29 for the required length so that it extends along said slots requiring addition of material.The upper ram assembly 40 is then inserted into the upper clamp block and cable guide. Lower 29,
The armature 32 is tightened with the cable 10 adjacent to the slot. Then, the insertion bar 41 is lowered and the shearing edge 46
cut the advanced length of cable 10 and place the cut cable portion in slot 45.
Push it into. Insertion bar 41 and upper clamp block and cable guide 29 are then retracted upwardly and a transfer mechanism picks up the armature from lower support block 34 and transports it to the next work station on the assembly line.

Cable 10 may be fed into armature 32 from only one direction, and cable 10 may be cut to length and placed into a slot in armature 32. Instead, two cables 1
0 towards the center of the armature 32 from both axial ends, a portion of each cable 10 may be cut and placed at its own axial end within a slot in the armature 32.
In the latter case, there is even better control over the balance of armature 32 in several different balancing modes. Obviously, several successive stations may be provided in the assembly line with a balance testing device between them to provide precise balancing control; The armature may be easily loaded and removed. The specific form of the balancing device will vary depending on different designs for different requirements and may vary considerably within the scope of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of a device according to the invention. FIG. 2 is a sectional view taken along line 2-2 of the first time. Figure 3 is 3-3 in Figure 1. FIG. FIG. 4 is an axial cross-sectional view of the armature, showing a part of the device and the electric wire inserted into the armature slot. FIG. S is an axial cross-sectional view showing the wire and armature held within the slot. [Explanation of symbols of main parts]

Claims (1)

[Claims] 1. A device for balancing a dynamo electric machine armature (32) of the type having magnetic poles separated by an axial slot containing an armature winding (48), which holds the armature. Means to do (29, 34
) and means (14, 16, 18, 20,
26), said cable is made of a material and has an outer diameter such that it can be inserted radially into said slot (45), said cable feeding means further comprising said one of said slots (45); The cable is adapted to pass through the shear edge (46) over the length required for armature balance by insertion into the armature, and when energized said length of the cable and substantially its entire length from the free end. including a bar (41) abutting along and adapted to push said length of cable radially into said armature slot (45) and retain therein;
said length of cable is separated from the remainder of the cable by said shear edge, and said bar is further biased to insert said length of cable radially into an armature slot (45). A device characterized in that it includes means (40) for. 2. The device according to claim 1, wherein the cable feeding means (14, 16, 18, 20,
26) is adapted to pass the shear edge at each axial end of the slot and route the cable (10) parallel to and adjacent to one of the slots (45) from both axial ends;
Apparatus characterized in that bar biasing means (40) are adapted to bias said bar (41) to insert the cut length of cable radially into the slot (45). . 3. The device according to claim 1 or 2, wherein the cable (10) has a cylindrical core (11) with an outer diameter smaller than the width of the opening of the slot (45), and a compressible outer sheath (12) of an uncompressed outer diameter greater than said width of the opening, said compressible sheath permitting insertion of the cable through the opening of the slot (45) and transporting the cable into the slot; A device characterized in that it is adapted to be held in place. 4. Magnetic poles separated by axial slots accommodating armature windings (48) using a device according to any one of claims 1 to 3. A method of balancing a dynamo electric machine armature (32) of the type having.