DE2744227A1 - SINGLE-PHASE INDUCTION MOTOR - Google Patents

Description

27U227

Siemens Aktiengesellschaft for Our ref Berlin and Munich VPA 77 P 3 2 5 4 BRD

Single phase induction motor

The invention relates to a single phase induction motor with at least one, only over part of the grooves on the bore urafang in the sense of a certain current deposition curve through different Conductor density in the unevenly distributed winding in the slots occupied by the winding.

According to the prevailing doctrine, there is an improvement in the operating data in single-phase motors without increasing the active material or the use of higher-quality materials possible in that due to uneven distribution of the winding on the circumference of the bore of the stator such a course of the current load is achieved that the envelope of its stepped curve is as sinusoidal as possible is. Such a requirement requires that the grooves of the highest conductor density are arranged in the vicinity of the neutral zone.

The object of the present invention is to use simple means in certain single-phase induction motors, in particular in those with symmetrical 2-strand stator winding the harmonic influences, especially third and fifth order to be able to reduce optimal utilization of the stand iron.

The solution to the problem posed is with a single-phase induction motor of the type mentioned at the outset possible according to the invention in that with one occupying less than 2/3 of the stator slots Winding in the stator, the slots with the highest conductor density are not near the neutral zone but near the pole center are arranged.

^{Bk2Bim / 27 9 1977} 9098 H / 0463

- Ϊ- J 77 P 3 25 4 FRG

In the case of a single-phase induction motor with a 2-strand, overall According to one embodiment of the invention, winding distributed over all the grooves on the circumference of the bore is provided that in the case of a non-symmetrical distribution between the two strands, the uneven winding distribution in both strands (Main and auxiliary phase) is different. However, it is a single-phase induction motor with a 2-strand winding and If a symmetrical division between the two strands is provided, the uneven winding distribution is advantageously achieved in both strands, each of which * depending on the direction of rotation Main or auxiliary phase can be executed in the same way. It has been shown that the winding division according to the invention deviates from the above teaching a substantial reduction in harmonic influences, in particular third and fifth order, can be achieved.

A further advantageous reduction in these harmonic effects can be achieved by providing a non-uniform gradation of the conductor density from slot to slot. An optimal use of the given iron volume in the stator is possible with a square outer contour of the stator in that a different groove size is provided to match the different conductor density, so that the grooves with the largest cross-section are each arranged in the vicinity of the pole center and these in the corners and are thus placed in the zone of greatest yoke height of the square stator plates .

The invention and further advantageous embodiments of the invention are explained in more detail below with reference to exemplary embodiments shown schematically in the drawing. It shows:

1 shows a 2-strand, symmetrically distributed stator winding with different conductor densities in the individual slots;

FIG. 1 shows the winding diagram of a 2-pole, two-phase coil winding with 24 slots. For example, the one

9098U / 0A53

Strand with conductors A, B, C as the main phase and the other strand with conductors a, b, c as auxiliary phase in one direction of rotation can be viewed, while in the other direction of rotation the main and auxiliary phases are interchanged in their effect. For the purpose of the uneven winding distribution according to the invention with its highest conductor density on the pole center axis facing Ends of the winding and its uneven gradation of the conductor density from slot to slot is provided that the connections A, a 87 conductors per slot, connections B, b also have 87 conductors per slot and connections C, c136 conductors per slot.

FIG. 2 shows the grooves of a two-pole one through which there is flow in the same direction Winding strand (main or auxiliary phase depending on the direction of rotation with symmetrical, two-strand winding). In the-

15th side of the neutral axis N.A. of this strand are first of all the Grooves A; B arranged with the same low conductor density (87 conductors per slot). On the one from the neutral axis N / A. distant and the center of the pole P.M. at the nearest end of this strand there is a larger groove C (136 in each case) Ladder per slot). The large grooves C would again be attached to the large grooves C, followed by the smaller ones Connect the slots of a second strand wound in the same way, the neutral axis of which with the pole center P.M. of the shown Strand coincides.

Although in the two-strand, two-pole winding shown in the figures, based on the distance on the circumference of the bore, the slots with the greatest conductor density are arranged closer to the neutral axis than to the pole center axis these grooves C, starting from those which can be occupied by the strand "Slot zones", to the pole center axis P.M. the next possible and to the neutral axis N.A. the furthest possible position.

2 figures

6 claims

8098U / 0453

-Γ-

L e r s e i t e

Claims (6)

77 P 3 2 5 4 FRG claims 97ΛΛ997 1 .j single-phase induction motor with at least one, only over part of the grooves on the bore circumference in the sense of a certain current load curve due to different conductor density in the grooves occupied by the winding unevenly distributed winding, characterized in that with less than 2/3 of the Stator slots occupying winding in the stunder, the ^T Iuten highest conductor density are not arranged in the vicinity of the neutral zone but in the vicinity of the pole center. 2. Single-phase induction motor with a 2-strand, overall winding distributed over all grooves on the circumference of the bore, thereby characterized in that in the case of a non-symmetrical division between the two strands, the uneven winding distribution is different in both strands (main and auxiliary phase). 3. Single-phase induction motor with a 2-strand, in total winding distributed over all grooves on the circumference of the bore, thereby characterized in that with a symmetrical division between the two strands, the uneven winding distribution is similar to both strands (main or auxiliary phase). 4. Single-phase induction motor according to one of claims 1-3, characterized in that in each case an uneven gradation of the conductor density is provided from slot to slot. 5. Single-phase induction motor according to one of claims 1-4, characterized in that a different groove size is provided to match the different conductor density is such that the grooves of the largest cross-section are each arranged in the vicinity of the pole center. 6. Single-phase induction motor with a square outer contour, characterized in that the grooves with the largest cross-section are placed in the corners and thus in the zone of greatest yoke height of the square stator plates. 9098U / 0453 ORIGINAL INSPECTED