US 12,438,429 B2
4-stator-pole step motor with passive inter-poles
Ted T. Lin, Saratoga, CA (US)
Assigned to Lin Engineering, Inc., Morgan Hill, CA (US)
Filed by Lin Engineering, Inc., Morgan Hill, CA (US)
Filed on Feb. 21, 2023, as Appl. No. 18/112,487.
Application 18/112,487 is a division of application No. 17/329,296, filed on May 25, 2021, granted, now 11,621,623.
Claims priority of provisional application 63/138,150, filed on Jan. 15, 2021.
Prior Publication US 2023/0208267 A1, Jun. 29, 2023
Int. Cl. H02K 37/14 (2006.01)
CPC H02K 37/14 (2013.01) 7 Claims
OG exemplary drawing
 
1. A two-phase bipolar step motor, comprising:
a permanently magnetized rotor having a plurality of pairs of rotor poles of alternating magnetic polarity; and
a stator having four primary stator poles with conductive windings around those primary stator poles and four dummy inter-poles located uniformly between every adjacent pair of primary stator poles, the dummy inter-poles lacking any conductive windings,
wherein there are three pairs of rotor poles with a rotor pitch angle of 120°, the motor characterized by a full step of 30° between successive one phase ON detent positions and by a half step of 15° between one-phase ON and two-phase ON detent positions.