TY - JOUR

T1 - Einfluss der Rotorgeometrie auf Schwingungs- und Geräuschemissionen elektrischer Fahrzeugantriebe

AU - England, Marc

AU - Ponick, Bernd

PY - 2021/10

Y1 - 2021/10

N2 - In the field of traction machines, permanent-magnet synchronous machines are usually designed with step-skewed rotors, i. e., the rotor is skewed along the core length segment by segment by one slot pitch in order to reduce parasitic effects, such as torque ripple, and to improve the acoustic behavior. However, step-skewing the rotor segments in the axial direction reduces the fundamental flux linkage of the permanent magnets compared to an unskewed machine. Therefore, more magnet material must be used in a skewed machine than in an unskewed machine to achieve the same torque, which increases the cost. Furthermore, skewing is a comparatively complex step in the manufacturing process, which increases the production time per machine and the cost. In this article, the influence of rotor pole width modulation on the performance of v-shaped buried magnet topologies is investigated. It evaluates whether this additional modification to the machine geometry can be used to create an unskewed motor that meets the specifications for torque ripple and maximum torque while limiting noise emissions. In order to design the rotor pole width modulation in a profitable way, a combination of magnet angles is identified by an analytical network that can reduce the critical flux density spatial harmonics of the rotor, which stimulate torque ripple and acoustic noise. Afterwards, the analytical results are validated with FEM calculations. The effect of the rotor pole width modulation on torque behavior as well as acoustic noise emission is compared with the step-skewed reference machine.

AB - In the field of traction machines, permanent-magnet synchronous machines are usually designed with step-skewed rotors, i. e., the rotor is skewed along the core length segment by segment by one slot pitch in order to reduce parasitic effects, such as torque ripple, and to improve the acoustic behavior. However, step-skewing the rotor segments in the axial direction reduces the fundamental flux linkage of the permanent magnets compared to an unskewed machine. Therefore, more magnet material must be used in a skewed machine than in an unskewed machine to achieve the same torque, which increases the cost. Furthermore, skewing is a comparatively complex step in the manufacturing process, which increases the production time per machine and the cost. In this article, the influence of rotor pole width modulation on the performance of v-shaped buried magnet topologies is investigated. It evaluates whether this additional modification to the machine geometry can be used to create an unskewed motor that meets the specifications for torque ripple and maximum torque while limiting noise emissions. In order to design the rotor pole width modulation in a profitable way, a combination of magnet angles is identified by an analytical network that can reduce the critical flux density spatial harmonics of the rotor, which stimulate torque ripple and acoustic noise. Afterwards, the analytical results are validated with FEM calculations. The effect of the rotor pole width modulation on torque behavior as well as acoustic noise emission is compared with the step-skewed reference machine.

KW - acoustic noise emission

KW - asymmetric rotor

KW - NVH

KW - permanent-magnet synchronous machine (PMSM)

KW - torque ripple

KW - traction

UR - http://www.scopus.com/inward/record.url?scp=85110032868&partnerID=8YFLogxK

U2 - 10.1007/s00502-021-00901-5

DO - 10.1007/s00502-021-00901-5

M3 - Artikel

AN - SCOPUS:85110032868

VL - 138

SP - 371

EP - 382

JO - Elektrotechnik und Informationstechnik (e+i) (Print)

JF - Elektrotechnik und Informationstechnik (e+i) (Print)

SN - 0932-383X

IS - 6

ER -