Mitsubishi Electric develops smallest, lightest motor controller unit for automotive power steering

Mitsubishi Electric Corporation has developed the smallest and lightest motor controller unit yet for electric power steering in automobiles. This next-generation motor controller unit is half in volume and 70% in weight compared to the company’s current products with equal output, contributing to the enhanced fuel efficiency of automobiles.

Mitsubishi Electric’s next generation motor controller unit. Click to enlarge.

Mitsubishi Electric has also upgraded steering assistance capabilities by improving the output performance of the motor by 30% through optimization of the electromagnetic design and the employment of the company’s original Poki-poki motor, which incorporates technologies that increase coil density. This prototype motor controller unit also features a unique control algorithm developed to provide enhanced steering sensation and stability. Mitsubishi Electric will provide the product to automobile and steering manufacturers in the near future.

Quick Specs
Controller part outside diameter
(excluding connectors)
&hi;93 mm
Motor part outside diameter &hi;80 mm
Total length 105~145 mm
Weight 1.7~3.1 kg
Rated torque 1.8~7.2 N&iddot;m

40% of new automobiles manufactured worldwide now incorporate electric power steering, which can reduce fuel cost by 3~5% compared to those using hydraulic steering. Automobile and steering manufacturers are increasingly calling for motors and controllers that are much smaller and lighter than current components to further improve fuel efficiency and facilitate installation of power steering systems. To fulfill these needs, Mitsubishi Electric has integrated the motor and controller into one unit, and aligned them on the same axis by improving the internal structure of the controller.

The Poki-poki motor uses a technology that can greatly improve lamination factor of winding and productivity, which helps to manufacture compact motors efficiently.

Click to enlarge.

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