DE8905354U1 - Rotating field machine - Google Patents

Description

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• : . : ;:.:. . .·\ ^: ..&iacgr; 89 G 8533 EN

Siemens AG

Rotating field machine 5

The invention relates to a rotating field machine according to the preamble of claim 1$ such a rotating field machine is known, for example, from EP-Bl-0 103 821.

Rotating field generators of the aforementioned type usually have a ring-shaped stator with a ring-shaped yoke and radially adjoining stator teeth facing the rotating machine part, between which stator slots remain, in which the winding phases of the winding are inserted. The End connections of the winding phases in the stator coils cross each other as soon as the number of winding phases is greater than 1; the crossing of the end connections of the winding phases leads to large, often disturbing axial projections of the winding heads.

According to the invention, in a rotating field machine of the type mentioned at the beginning, the axial length can be noticeably reduced in an advantageous manner without any disadvantages in terms of construction or electrical design by the stator teeth being alternately are inclined to the left or right in relation to their radial symmetry line. The winding parts of the winding strands are therefore automatically arranged during winding predominantly in the slot part with the larger cross-sectional width and subsequently position themselves in the radial direction under different, so that the axial winding head length can be reduced significantly due to the lack of crossing points. If, in such a stator yoke construction, the winding coils are first inserted, which occupy the slots with the wider slot base, then their end connections can be made without

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Λ 1 The front surface of the yoke is bent, sometimes even radially above the slot base. The winding coils, which are placed in the slots that are wider towards the slot opening, can then be subsequently inserted in such a way that their front connections can be laid largely without overlapping the winding heads of the winding coils that were inserted first, in the sense of a small overall axial projection.

The invention is explained in more detail below using a schematic representation of a section of a stator.

In a stator yoke 1 of an internal rotor motor, several stator slots 4,5 are punched out on the circumference of the rotor-side bore 8, which are laterally delimited by stator teeth 2,3. According to the invention the center lines of the stator teeth 2 and 3 are alternately rotated to the left or right relative to the radial symmetry line S in such a way that, as a rule, the cross-sectional widths of the stator slots 4, 5 located between the stator teeth 2, 3 alternately widen towards the slot base or slot opening. As can be seen from As can be seen in FIG 1, the stator slots 4 are each widened in the direction of the slot opening directed towards the bore 8 and the stator slots 5 are each widened towards the bottom of the slot. The stator slots 2, 3 are expediently designed - particularly at their bore-side ends - so that a uniform moderate tooth head division occurs.

In order to illustrate the advantageous installation of the end connections that can be achieved according to the invention, a first winding coil with its coil sides 6 is introduced into the slots D with an enlarged cross-section at the slot base and a second winding coil with its coil sides 7 is introduced into the slots 4 with an enlarged cross-section at the slot opening. From the schematically indicated courses of the end head connections, it can be seen that the end connections 61 of the first-mentioned winding strand essentially relate to a:

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larger diameter than the end connections 71 of the winding strand mentioned below, so that a crossing of the end connections 61 with the end connections 71 can be avoided - at least to a significant extent - which results in a smaller overall axial projection of the end connections (J) in comparison to conventional yoke sections with stator teeth running in the direction of the symmetry line S.

The embodiment shows the invention for a stator ID with an associated internal rotor. Using the principles of the invention, the same advantageous smaller axial size can also be achieved for rotating field machines with an internal stator and an associated external rotor.

The same advantages can also be achieved with sector-shaped stator or rotor designs; in this case, a completely symmetrical winding structure can be ensured by alternately assigning the coil sides 6 and 7 in successive sectors to the winding phases.

Claims (6)

89 G O 5 3 3 DE Protection claims 1. A rotating field machine with a stator winding (coil sides 6, 7) housed on the circumference of a stator yoke (1) in stator slots (4, 5) separated by stator teeth (2, 3), the number of winding phases m=2 or m=4 and the number of slots per pole and phase q=1, characterized in that the stator teeth (2 or 3) are alternately inclined to the left or right relative to the radial line of symmetry (S) in the sense of the cross-sectional width of the stator slots (4, 5) increasing alternately towards the slot base or slot opening. 2. Rotary field machine according to claim 1, characterized in that the coil sides (6, 7) of the winding strands are predominantly accommodated in the slot part with the larger slot cross-sectional width. 3. Rotating field machine according to claim 1 and/or 2, characterized by at least one sector stator in the sense of a stator covered with slots, teeth and winding parts only over a partial circumference. 4. A rotating field machine according to one of claims 1 to 3, characterized by an external stator with an associated internal rotor. 5. Rotating field machine according to one of claims 1 to 3, characterized by an internal stator with an associated external rotor. 6. Rotary field machine according to at least one of claims 1 to 5, characterized by a tooth tip design of the stator teeth (2, 3) in the sense of a uniform division of the tooth tip widths over the grooved bore circumference.