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wanglipeng00000
Level 2
Level 2
10 questions asked 25 sign-ins 10 likes given

Hi, i am using IGBT to control PMSM, for example, if the normal voltage of pmsm is 600V, the current is 300A, How to choose IGBT category according to current and voltage?

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1 Solution
cynic_bandera
Employee
Employee
5 questions asked First question asked 100 sign-ins

You choose IGBT abs max voltage about 20% higher than the expected collector-emitter voltage at the worst condition (you count your topology, switching voltage spikes, input over-voltage). You choose IGBT current rate according to Tj and power dissipation. Abs max current drops at higher temperatures. So choose proper cooling, it might be you need to parallel devices to achieve higher current.  You also have to consider peak current so that it would survive.

Keep in mind there are many other parameters you have to consider, for example dynamic characteristics, ability to operate at short circuit (10us specified typically) and so on.

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3 Replies
cynic_bandera
Employee
Employee
5 questions asked First question asked 100 sign-ins

You choose IGBT abs max voltage about 20% higher than the expected collector-emitter voltage at the worst condition (you count your topology, switching voltage spikes, input over-voltage). You choose IGBT current rate according to Tj and power dissipation. Abs max current drops at higher temperatures. So choose proper cooling, it might be you need to parallel devices to achieve higher current.  You also have to consider peak current so that it would survive.

Keep in mind there are many other parameters you have to consider, for example dynamic characteristics, ability to operate at short circuit (10us specified typically) and so on.

yifei_y
Moderator
Moderator
Moderator
25 likes received 100 solutions authored 100 sign-ins

It is recommended to keep at least 50% margin of voltage and current ratings, 1200V 450A would be a good choice.

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wanglipeng00000
Level 2
Level 2
10 questions asked 25 sign-ins 10 likes given

Thanks very much.

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