access icon free Taguchi's robust design optimisation of water-cooled ISG motors considering manufacturing tolerances

© The Institution of Engineering and Technology
Received 05/07/2019, Accepted 02/01/2020, Revised 11/11/2019, Published 09/01/2020

Electrical machines are widely used as a driving source for various applications because of their wide speed range, high efficiency, and torque density. Similar to any other machine, manufacturing tolerances occur when mass producing the motors. In particular, the tolerances of the shape of the motor or the residual flux density in the permanent magnet significantly affect the back-electromotive force (EMF), inductance etc. When the magnitude of the back-EMF is changed, the armature current must be changed to obtain the same torque. This consequently affects the loss of the motor, and hence leads to changes in efficiency. In particular, the loss changes cause thermal problems such as irreversible demagnetisation of the magnets and dielectric breakdown due to the increase in the temperature of the coils. Therefore, to reduce the inevitable manufacturing tolerance, a robust methodology should be assured. Here, the Taguchi's robust design is applied to an integrated starter-generator motor by using the signal-to-noise ratio to consider the coil temperature.

Inspec keywords: optimisation; starting; cooling; permanent magnet generators; synchronous motors; permanent magnet motors; electric potential; demagnetisation; hybrid electric vehicles; torque

Other keywords: robust methodology; water-cooled ISG motors; torque density; residual flux density; integrated starter-generator motor; manufacturing tolerances; driving source; back-electromotive force; back-EMF; armature current; inevitable manufacturing tolerance; loss changes; Taguchi's robust design optimisation; wide speed range; electrical machines

Subjects: d.c. machines; a.c. machines; Control of electric power systems; Transportation; Synchronous machines

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