TY - JOUR
T1 - Dual-Purpose No-Voltage Winding Design for the Bearingless AC Homopolar and Consequent Pole Motors
AU - Severson, Eric
AU - Nilssen, Robert
AU - Undeland, Tore
AU - Mohan, Ned
N1 - Publisher Copyright:
© 2015 IEEE.
PY - 2015/7/1
Y1 - 2015/7/1
N2 - A winding design approach is proposed for the bearingless ac homopolar and consequent pole motors that utilizes the same coils for both suspension force and torque production. This enables a 'pure' bearingless motor design, where the same iron and copper are used for both magnetic bearing operation and torque production, and can result in more optimal machine performance. Separate terminal connections are provided for suspension and torque operation; the suspension terminals experience no motional-emf when the rotor is centered, thereby reducing the required voltage rating of the bearingless drive compared to other 'dual purpose' winding designs. It is shown that only certain combinations of stator slots, phases, and poles yield suitable winding designs; most notably, the number of motor pole-pairs must be co-prime with the number of phases. A design procedure is proposed which allows the designer to simply modify end-connections of many conventional armature windings, including both integral-and fractional-slot windings; an example winding design is presented and analyzed using 3-D finite element analysis (FEA); and a hardware prototype has been constructed with experimental results included to validate the proposed design approach.
AB - A winding design approach is proposed for the bearingless ac homopolar and consequent pole motors that utilizes the same coils for both suspension force and torque production. This enables a 'pure' bearingless motor design, where the same iron and copper are used for both magnetic bearing operation and torque production, and can result in more optimal machine performance. Separate terminal connections are provided for suspension and torque operation; the suspension terminals experience no motional-emf when the rotor is centered, thereby reducing the required voltage rating of the bearingless drive compared to other 'dual purpose' winding designs. It is shown that only certain combinations of stator slots, phases, and poles yield suitable winding designs; most notably, the number of motor pole-pairs must be co-prime with the number of phases. A design procedure is proposed which allows the designer to simply modify end-connections of many conventional armature windings, including both integral-and fractional-slot windings; an example winding design is presented and analyzed using 3-D finite element analysis (FEA); and a hardware prototype has been constructed with experimental results included to validate the proposed design approach.
KW - Bearingless machines
KW - bridge configured winding
KW - self-bearing motor
KW - single motor winding
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U2 - 10.1109/TIA.2015.2388852
DO - 10.1109/TIA.2015.2388852
M3 - Article
AN - SCOPUS:84937845561
SN - 0093-9994
VL - 51
SP - 2884
EP - 2895
JO - IEEE Transactions on Industry Applications
JF - IEEE Transactions on Industry Applications
IS - 4
M1 - 7004847
ER -