Three phase motor control

[Ilia Gildin]

Hello
I have this motor control system and I dont understand why on every transistor between the enitter and collector there is a diode?

 

[KlausST]

Hi,

a screenshot without much information....
Therefore only a brief answer: most (all) IGBTs have them inside.

Going through the document you might find additinal information.
Also wikipedia is always a good hint for informations: https://en.wikipedia.org/wiki/Insulated-gate_bipolar_transistor

Klaus

 

[rhnrgn]

In order to protect mosfets from Back EMF of coils of motor windings.

Best Regards