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Vibration Reduction of Two Motors of Rear Wheel Drive for SPORT HYBRID SH-AWD

Article of Honda R&D Technical Review Vol.27 No.1

Summary

The two motors employed to drive the rear wheels in the SPORT HYBRID SH-AWD system were developed to balance compactness, high power, high torque, and quietness. Stators employing concentrated windings were used to reduce the size of the motors, and development focused on the combination of slot number and pole number, the magnetic circuits, and control methods in an attempt to satisfy one of the development goals, the reduction of torque fluctuation, which is a cause of vibration and cabin noise.
A Gradually Enlarged Air Gap was adopted for the magnetic circuits. The Gradually Enlarged Air Gapshape offsets the centers and modifies the curvature of the rotor and the stator, producing continuous change in the air gaps with the rotation of the rotor. The application of the Gradually Enlarged Air Gap method made it possible to reduce torque fluctuation while also controlling decline in torque. Superposition of higher harmonics was applied as a control method. This control method reduces torque fluctuation by superposing high-frequency components on the motor traction control current in order to cancel the torque waveform peak.
The newly developed motors realize a 50% reduction in cogging torque and torque ripple in comparison to the previous specifications, and motor vibration has been reduced by 10 dB and cabin noise by more than 13 dB.

Reference

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Author (organization or company)

Manabu YAZAKI(Automobile R&D Center)、Tadanobu AOKI(Automobile R&D Center)

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