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User17668
Level 2
5 replies posted 10 questions asked 5 questions asked
Level 2
Hi Infineon team,

What is the root cause of the dV/dT limitation in motor drives?

Thanks, BR
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schmoelb
Employee
First solution authored
Employee
High dv/dt leads to an uneven voltage distribution along the windings resulting in partial discharge in the insulation. This high voltage discharge destroys the insulation over time and must be prevented. For this reason dvdt Limits were defined from NEMA MG1 Part 31 and IEC 60034 and are below 10V/ns.
Nevertheless Wide Bandgap devices like SiC could be switched faster with the need of new motor designs were one lever could be removing long cables causing reflections.

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schmoelb
Employee
First solution authored
Employee
High dv/dt leads to an uneven voltage distribution along the windings resulting in partial discharge in the insulation. This high voltage discharge destroys the insulation over time and must be prevented. For this reason dvdt Limits were defined from NEMA MG1 Part 31 and IEC 60034 and are below 10V/ns.
Nevertheless Wide Bandgap devices like SiC could be switched faster with the need of new motor designs were one lever could be removing long cables causing reflections.
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