DE3005423A1 - Balancing rotors, esp. electric motor armatures, - using separate static and dynamic measurement and correction processes - Google Patents

Abstract

The method is used for balancing rotors and is esp. applicable to the armatures of electric motors. Balancing is performed more rapidly than with conventional devices. Static and dynamic imbalance are balanced out in separate balancing processes. The static imbalance is corrected in the measured centre of mass plane (5') or in equidistant planes. The dynamic imbalance fine couple is corrected using two balancing units (6,7) mutually offset by 180 degrees w.r.t. the rotor (3). The balancing units (6,7) are separated from the balance points (16,17) by equal distances and are controlled synchronously via a single device (11) according to the size of the imbalance fine couple until this is brought within tolerance.

Description

"Balancing device

of rotors, especially electric motor armatures " the The invention relates to a device for balancing rotors, in particular electric motor armatures according to the preamble of claim 1.

From the desiccation of automatic balancing of electric motor armatures " in the journal teciinica 1/2 1977 are z. B balancing systems became known, in which the imbalance of the rotors in two levels in consecutive stations measured and balanced. This balancing in two planes is like statistical Studies have shown, but not always necessary for many rotors, because the smoothness of the run is enhanced by a pair of imbalance forces in different applications not so strongly noticeable negatively. The tolerance of the permissible unbalance force pair can therefore be significantly greater than the permissible static Itest imbalance.

The technical and financial effort involved in balancing rotors in two levels is therefore often not necessary - and leads to an uneconomical one Balancing, which can make the products more expensive in an unacceptable manner.

Balancing systems have therefore also become known in which only the static unbalance is measured and compensated. In a downstream Control run, in which the imbalance force couple is also measured, can then with the help of known limit indicator, it is decided whether a compensation of the still existing Imbalance force couple is required, or ol) the rotor immediately for further processing can be transported further.

The imbalance force pair is compensated for in accordance with the tuf standard a balance as he z. B. through the i) E-PS 1 241 153 became known is. For this purpose, the rotor can be stored in a corresponding receptacle and the compensation one after the other with intermittent turning of the rotor in two planes be performed. This compensation causes a considerable time delay, because the equalization is carried out in both planes one after the other and before the equalization In the second level the rotor is initially relaxed, turned by 1800 and then again must be tensioned.

The object of the invention is therefore to overcome the disadvantages of the known devices to avoid and to propose a device for balancing rotors that ensures a much faster compensation and also a lower control effort makes necessary.

This is in a device of the type mentioned by the Features of the characterizing part of claim 1 solved. In the subclaims advantageous embodiments of the invention are indicated.

The device according to the invention makes it possible to use the remaining, The unbalance force pair lying outside the tolerance simultaneously with the two compensation units compensate, whereby it is ensured that the control effort is kept to a minimum will.

With the same preset radial compensation depth in relation to Rotor of the material-removing compensation units, in particular the Friseinhefts, In a preferred embodiment, only one feed unit is used for both compensation units required, whereby the feed rate corresponds to the measured unbalance force can be controlled. An influence that falsifies the measured values due to the mass balancing does not take place in two planes, since the feed for both compensation units with Security is the same.

The invention is explained in more detail below with reference to a figure, in which the invention is shown schematically.

A clamping fixture 2 can be provided on a machine table 1, which can accommodate the rotor 3. The tension can be achieved by means of a movable clamping jaw 4 take place, the clamping force via a. Cylinder unit 5 are applied can.

However, any other known clamping device can also be provided However, it must be arranged in such a way that compensation in the two compensation levels of the rotor 3 possible (: h is.

The mass balancing can be additive or as in the embodiment shown stbtractive, done by milling. The compensation units 6 and 7 can be behind the Aufnahrie 2 be arranged on a guide rail 8 displaceably. The compensation units 6 and 7 can be designed as milling units with corresponding milling cutters 9 and 10 who can mill the laminated core of the rotor 3 from the outside.

The milling units 6 and 7 are now arranged according to the invention so that that these are offset by 1800 in relation to the rotor 3. This allows the mass balancing with the milling cutter 9 on the upper side according to the milling pattern 16 and with the milling cutter 10, offset by 1800, on the lower side of the rotor 3 according to the milling pattern 17 at the same time be performed. At the same time it must be ensured that the compensation units 6 and 7 to the compensation points 16 and 17 have the same distances to in both To be able to carry out equalization levels evenly. With unequal Otherwise there will be a new static unbalance and also a new one Imbalance force couple.

The radial compensation depth can be achieved by means of a Facilities can be preset in a suitable size. The advance of the two Compensation units 6 and 7, axially to the rotor 3, karm through a drive unit 11, e.g. 13. a direct current motor; according to the Grölle of the measured force pair is controlled. On the shaft 12 of the Drive unit 11, a pinion 13 can be provided, which is in two opposite Racks 14 and 15 engages. The rack 14 can in this case with the drive unit 6 and the rack 15 can be connected to the drive unit 7.

However, another suitable feed guide can also be used come.

After the rotor 3 has been stored and clamped in the receptacle 2 the two compensation units 6 and 7 by means of the one drive unit 11 synchronously moved from the outside to the center of the rotor 3 until the measured imbalance force couple is balanced or in tolerance.

Claims (1)

Claim: Method for balancing rotors, in particular Electric motor armature, in which the static unbalance in a first balancing process measured and balanced and in a subsequent second selection process the imbalance forces p ¢ .tar measured and balanced by means of two compensation units is, whereby a compensation unit is provided for each compensation level, thereby characterized in that the static unbalance in the determined center of gravity plane S 'or in equidistant planes and that the imbalance force couple by means of two in relation to the rotor (3) offset by 180 ° compensation units (6, 7) is compensated, wherein the equalization units (6, 7) to the equalization points (16, 17) are the same distances have and by a single device (11) according to the size of the imbalance force couple can be controlled synchronously.