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http://www.gminsidenews.com/articles/gm-patents-an-electric-motor-with-multiple-magnet-lengths/

It looks like GM has designed an electric motor that could possibly be used in multiple applications with differing performance compromises.

Published on December 19, 2017, by the USPTO, GM has filed a patent for an electric motor with multiple magnet lengths which could totally change how the company thinks about manufacturing electric propulsion systems.

For example, the Chevrolet Bolt uses a permanent magnet brushless motor, where a magnetic field is produced by the spinning magnet and rotor assembly which then transfers to the stator core and interacts with flowing current to create torque. Differing magnet lengths will change the torque output, smaller magnets decrease torque, while longer ones increase torque, proportionally.

What the company is proposing is a new ‘modular’ lamination sheet which would be capable of accepting multiple magnet lengths. Instead of being forced to re-engineer the lamination stack each time a change in magnet length is required, GM proposes a series of tabs within the apertures of the lamination sheets which, when layered, can be assembled to delineate the magnet slots.
 

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Sounds like this motor design will fit in nicely with GM's plan of 20 BEVs of varying sizes in the next 4 years. :D
 

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Great find. Interesting idea, reducing both development and production costs for EV motors for multiple applications.

It is kind of like having a basic EV motor platform that can be quickly tweaked for different products (via magnet length/flux strength) with simplified development engineering and then produced at a lower unit cost through sharing common parts and production tooling.

Their new modular battery pack platform: EME1.0 also appears to use that concept. It appears it will be a single shared structural skateboard base, perhaps with TMS and BMS pre-engineered and pre-piped and wired, and ready to accept varying #'s of battery modules to match various pack kWh sizes and peak kW power loads.

GM has been consolidating their ICE platforms the past 10 years to fewer, more flexible platforms to work on more vehicles, reducing both engineering/development time and production costs. It appears that is also their approach at their next-generation EV development.
 

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It is a great find. Not a silver bullet but another tool to share parts over a wide range of vehicles. Super interesting.
 
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