US 12,142,974 B2
Brush-commutated DC electric motor with an improved oscillation behavior
Jens Schulze, Giswil (CH); Eugen Elmiger, Sempach (CH); and Kacper Emmrich, Lucerne (CH)
Assigned to Maxon International AG, Sachseln (CH)
Appl. No. 17/786,351
Filed by Maxon International AG, Sachseln (CH)
PCT Filed Dec. 23, 2020, PCT No. PCT/EP2020/087765
§ 371(c)(1), (2) Date Jun. 16, 2022,
PCT Pub. No. WO2021/130312, PCT Pub. Date Jul. 1, 2021.
Claims priority of application No. 19219406 (EP), filed on Dec. 23, 2019.
Prior Publication US 2023/0013171 A1, Jan. 19, 2023
Int. Cl. H02K 13/10 (2006.01); H02K 1/12 (2006.01); H02K 1/27 (2022.01)
CPC H02K 13/10 (2013.01) [H02K 1/12 (2013.01); H02K 1/27 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A brush-commutated DC electric motor having a stator comprising a permanent magnet, having a number p of pole pairs, and having a rotor rotatable with respect to the stator, which has a hollow-cylindrical iron-free winding with a geometric axis and a number Q of sub-coils, and a collector with a number K of collector segments, wherein the sub-coils are arranged distributed over the periphery of the rotor, and wherein the brush-commutated DC electric motor furthermore has at least one pair of brushes which are in contact with the collector and by means of which the sub-coils are energized, wherein the arrangement of the brushes and the interconnection of the sub-coils are selected in such a way that in each case a number n≥2 of sub-coils, which are each arranged offset by 360°/n in a rotationally symmetrical manner with respect to the axis of the rotor, are always supplied with the same current at the same time, wherein the number p of pole pairs is greater 1, wherein the collector has a number K=k·p of collector segments, wherein k is an uneven number ≥3, wherein the number Q of sub-coils is q·p, wherein the number q either corresponds to the number k or to the double of the number k, and wherein the number n of the sub-coils which are each arranged in a rotationally symmetrical manner with respect to each other and are each energized at the same time corresponds to the number p, if q=k, or the double of p, if q=2·k, and wherein a number p of collector segments, which are also each arranged offset by 360°/p in a rotationally symmetrical manner with respect to the axis of the rotor, are connected to each other in a conductive manner on the rotor side.