[JAC303] Geometry Optimization of a Motor Considering Vibration at System-level

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Overview

Geometry Optimization of a Motor Considering Vibration at System-level
In motor-equipped equipment, such as EV powertrains, not only high efficiency and output are required, but also requirements for low noise and vibration are increasing. The electromagnetic force of the built-in motor is one of the sources of noise and vibration, and it is known that this has a large effect.
By performing optimization calculations using the FEA, it is possible to obtain global optimal design from a vast design space.
In this document, the dimensional optimization of a single motor is performed to minimize the vibration at the system level.

Optimization condition

Fig. 1. Design Variables, Optimization Objectives
The dimensional variables and optimization conditions are shown in Fig. 1.

Optimization result

The obtained optimization result is shown in Fig. 2, and the magnet shapes and vibration accelerations of the initial design proposal and the optimal solution are shown in Fig. 3.
Fig. 3 shows that in the optimal solution, the I-shaped magnet is moved to the inner diameter side to suppress the concentration of d-axis magnetic flux to reduce vibration, and the main pole width is increased to prevent flux leakage between the teeth to maintain torque.

Fig. 2. Optimization result
Fig. 3. Optimal solution

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