September 22 2017

The SUMO powertrain systems family: A direct drive to success

TM4 introduced its first SUMO powertrain system in the market during the summer of 2012, which means that this family of products is now entering its fifth year of deployment in dozens of vehicles applications. With more than 75 million kilometers of real road driving and no design-related failures, the technical and commercial success of this product family is evident. More importantly, it helped TM4 establish itself as a global supplier of electrified commercial vehicle drivetrains, both by expanding its…
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October 14 2016

5 advantages of a direct-drive motor

TM4 offers its SUMO direct-drive powertrains for the bus and commercial vehicle markets. They represent the best compromise between efficiency and simplicity for our customers looking to electrify their commercial vehicle platforms. But why did TM4 come up with this design choice, you  may ask? When TM4 first started to develop motor and inverter systems for the commercial vehicle market, our original idea, as a company mainly involved in automotive projects, was to design a high RPM and high power…
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August 29 2016

Increasing Efficiency of Electric Vehicle Powertrain using IGBT inverters

Ultimately, one of the key to being able to optimize the hardware design and the control software of inverters acting as motor controllers is having an in depth knowledge of the design of electric motors. It is one thing to ensure that electric motors and inverters not only have the highest possible efficiency as standalone products, but to design a truly efficient powertrain system, the challenge is keeping the combined efficiency of these components at the highest level possible.

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