US 12,355,312 B2
Rotor position sensor system for a slotless motor
Liam Bowman, Hethel (GB)
Assigned to ETA Green Power Limited, (GB)
Filed by ETA Green Power Limited, Hethel (GB)
Filed on Dec. 16, 2022, as Appl. No. 18/082,760.
Claims priority of application No. 2118458 (GB), filed on Dec. 17, 2021.
Prior Publication US 2023/0198344 A1, Jun. 22, 2023
Int. Cl. H02K 11/21 (2016.01); G01D 5/14 (2006.01); H02K 3/34 (2006.01); H02K 3/47 (2006.01); H02K 5/06 (2006.01)
CPC H02K 11/21 (2016.01) [G01D 5/14 (2013.01); H02K 5/06 (2013.01); H02K 2213/03 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A slotless motor comprising:
a flux ring;
a rotor having a rotational axis;
a plurality of coil windings arranged into an integer N number of distinct blocks, each block being arranged about the rotational axis and having a gap between each adjacent pair of blocks; and
a rotor position sensing element comprising:
a sensor ring having a plurality of sensors fixed to the sensor ring; and
a sensor ring attachment extending from the sensor ring;
wherein the plurality of sensors are spaced around the rotational axis; and
wherein the rotor position sensing element is configured to hold the sensor ring relative to at least one of the blocks such that the plurality of sensors is held in a predetermined position; wherein
the sensor ring attachment is formed as a tapering projection, and wherein the tapering projection is shaped to match the shape of the gap.