Published in Transportation

Interesting new electric motor developed

by on12 August 2019


Texan comes raises $4.5 million in seed funding

Texas based Linear Labs' has drummed up a lot of interest in its new circumferential flux electric motor design.

The gear usesfour rotors, when other motors typically run one or two and a software-reconfigurable, multi-coil stator, enclosed in a 3D magnetic "torque tunnel" to maximize efficiency even at high speeds.

The stator can be configured on the fly by regrouping coils to use a variable number of overlapping phases simultaneously, producing full torque smoothly at low rpms without torque pulsing, or changing speeds with no change to frequency, current, or voltage, like an electronic transmission.

A new approach to field weakening by gradually misaligning permanent magnets allows efficiencies to actually climb as speeds increase.

These features produce a highly compact motor with two to five times the torque density, at least three times the power density and at least twice the total output of any conventional permanent magnet motor of the same size.

This eliminates the need for gearing in many applications, reducing costs and weight while gaining 10-20 percent more range from a given battery pack.

Linear Labs has received 21 patents so far, with another 29 pending, and their prototypes have been verified by independent expert tests. Recently they received $4.5 million in seed funding and are planning to build them into car and scooter prototypes over the next couple of years.

Last modified on 12 August 2019
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