DE102011108583A1 - Electric motor e.g. multi-speed motor has coil groups that are wound concentrically adjacent to each other along circumferential direction in overlapping manner - Google Patents

Abstract

The electric motor has a stator winding of strands. The strand has coil groups that are formed from two sub-groups of coils. The coil groups are wound concentrically adjacent to each other along circumferential direction in overlapping manner. The coil groups are provided with stator grooves that are spaced apart from each other.

Description

The invention relates to an electric motor, in particular a pole-changing motor.

A three-phase motor after 1 is known from the prior art, wherein each strand has two groups of coils which are retractable with a retraction tool in a Spuleneinzugsmaschine in grooves of the stator housing. The stator grooves extend in the axial direction and are regularly spaced from one another in the circumferential direction.

The invention is therefore based on the object to enable a cost-effective production of a pole-changing motor with little effort.

According to the invention the object is achieved in the electric motor, in particular pole-changing motor, according to the features indicated in claim 1.

Important features of the invention in the electric motor, in particular pole-changing motor, are that the stator winding consists of strands,
each strand having coil groups,
wherein each coil group is formed from at least two sub-coil groups,
wherein the coils of a first partial coil group are arranged concentrically wound,
wherein the coils of a second partial coil group are arranged concentrically wound,
wherein the first and second sub-coil groups are arranged adjacent to each other and / or circumferentially overlapping.

The advantage here is that the same tool for inserting the coils in the stator is used as in a motor according to the prior art, which is not polumschaltbar and / or has a three-phase winding according to the prior art. Thus, with the same tool a pole-changing and a motor with classic three-phase winding can be manufactured.

In an advantageous embodiment, the coils of the first partial coil group are drawn into two groups of stator slots,
wherein the stator slots in each group are circumferentially spaced from one another regularly,
wherein the groups are circumferentially spaced from each other. The advantage here is that the tool for pulling the coils is defined by the group spacing in the circumferential direction and the distance in the circumferential direction within the respective group.

In an advantageous embodiment, the stator of the first coil subgroup are equally spaced and thus the coils of the first coil group of the same tool in the associated Statornuten retractable as a coil group of a strand of a three-phase winding of a non-pole-changing motor, in particular a motor according to the prior art. The advantage here is that the same tool for feeding the coils is used in the pole-changing motor according to the invention and in a motor with conventional three-phase winding according to the prior art.

In an advantageous embodiment, the pole-changing motor has a pole-changing Dahlander winding, in particular a m / n Dahlander winding
where m and n are each integers greater than 2, in particular where m is 4 and n = 2. The advantage here is that the motor according to the invention can be manufactured without additional tools and is still pole-changing, although the tool for a non-pole-changing motor with classic three-phase winding, so according to the prior art, is usable.

Further advantages emerge from the subclaims. The invention is not limited to the combination of features of the claims. For the skilled person, further meaningful combination options of claims and / or individual claim features and / or features of the description and / or figures, in particular from the task and / or the task posing by comparison with the prior art arise.

The invention will now be explained in more detail with reference to schematic illustrations:

In the 1 is the well-known in the art winding diagram of an electric motor, which is designed as a three-phase motor shown.

In the 2 an inventive winding scheme is shown.

In both figures, the circumferentially regularly spaced, extending in the axial direction Statornuten in the circumferential direction are numbered from 1 to 36, wherein the stator 1 again follows the Statornut 36, since the motor is designed as a rotary motor.

The winding schemes of both figures both relate in each case to a rotary motor.

In 1 are each a winding strand provided for the phases U, V and W of the three-phase motor, which is also denominated as a strand.

Each strand contains two coil groups, each coil group consisting of three concentrically arranged coils. For example, the coil (1, 12), the coil (2, 11) and the coil (3, 10) form a first coil group of the strand of the phase U. The coil (19, 30), the coil (20, 29) and the coil (21, 28) form the second coil group of the strand of the phase U. Both coil groups are designed concentrically.

In a corresponding manner, the strands of the phases V and W are executed.

In contrast to 1 Although in the embodiment according to the invention, each strand is made up of two coil groups. However, each coil group has two adjacent sub-coil groups.

Each of the coils of each sub coil group is concentric. However, the two sub-coil groups are arranged overlapping in the winding scheme, so to speak nested.

The first partial coil group of the first coil group of the strand of the phase U consists of the coils (1, 12), (2, 11) and (3, 10). The second partial coil group of the first coil group of the strand of the phase U consists of the coils (4, 15), (5, 14) and (6, 13). The first and second sub-coil groups are therefore juxtaposed and concentric.

The winding scheme after 2 represents a 4/2 pole Dahlander winding. Because by the lead out of the winding connections thus a pole-changing motor can be produced.

The advantage of the winding scheme according to the invention is that the associated motor is Polumschaltbar and yet the same tool for drawing the windings in the stator is used as in 1 So the state of the art.

For the first part coil group ((1, 12), (2, 11) and (3, 10)) of 2 corresponds to the first coil group of the same strand of the 1 ,

The tool of the Spuleneinziehmaschine pushes the wound outside the stator housing windings when inserted into the stator in the associated Statornuten. This tool thus draws the sub-coil group ((1, 12), (2, 11) and (3, 10)) in the stator and thus is for a non-inventive engine from the prior art and also for the engine according to the invention Winding scheme after 2 usable.

The tool is defined by the number of Statornuten, so two groups of three, and the spacing of the groups of three in the circumferential direction.

In other embodiments of the invention, a different type of winding is used, but again the same tool is used for a non-pole-changing and for a pole-changing electric machine.

LIST OF REFERENCE NUMBERS

• U1, V1, W1

  stator winding

  U2, V2, W2

  stator winding

Claims (4)

Electric motor, in particular pole-changing motor, wherein the stator winding consists of strands, each strand has coil groups, characterized in that each coil group is formed from at least two sub-coil groups, wherein the coils of a first coil group are arranged concentrically wound, wherein the coils of a second coil group concentric are arranged wound, wherein the first and the second partial coil group are arranged adjacent to each other and / or overlapping in the circumferential direction. Electric motor according to at least one of the preceding claims, characterized in that the coils of the first partial coil group are drawn into two groups of stator slots, wherein the stator slots in each group are circumferentially spaced from one another regularly, wherein the groups are circumferentially spaced from each other. Electric motor according to at least one of the preceding claims, characterized in that the stator of the first coil subgroup are equally spaced and thus the coils of the first coil group of the same tool in the associated Statornuten retractable as a coil group of a strand of a three-phase winding of a non-pole-changing motor, in particular an engine according to the prior art. Electric motor according to at least one of the preceding claims, characterized in that the pole-changing motor has a pole-changing Dahlander winding, in particular a m / n Dahlander winding, where m and n are each integers greater than 2, in particular where m = 4 and n = 2.

Images