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Automcdonough · 09-05-2010, 01:08 PM

2200V??? Do the IGBT's have to be rated for this or can it be snubbed without losing the information in the signal? Someone who knows more about vector control will have to chime in on that one. Or perhaps just dealing with position encoders suddenly seems like a great compromise!

The IGBT's I'm planning to use are 800A/650V. After 650V the Vf practically doubles, making things a lot less efficient. I was already planning on building some headroom into the voltage rating there by wiring the motor for 240V instead of 480V, the bus will be in the 320~380V range using active clamping to prevent reaching 400V.

Part of this decision was also rooted in arc-flash safety, I just don't want the battery voltage any higher than this from a liability perspective. (does everyone here know about arc-flash hazards? If not look it up, it's a very big deal!!)

09-05-2010, 01:08 PM	#299 (permalink)
Automcdonough EcoModding Lurker Join Date: Jul 2010 Location: Cleveland, OH Posts: 89 Thanks: 5 Thanked 7 Times in 5 Posts	2200V??? Do the IGBT's have to be rated for this or can it be snubbed without losing the information in the signal? Someone who knows more about vector control will have to chime in on that one. Or perhaps just dealing with position encoders suddenly seems like a great compromise! The IGBT's I'm planning to use are 800A/650V. After 650V the Vf practically doubles, making things a lot less efficient. I was already planning on building some headroom into the voltage rating there by wiring the motor for 240V instead of 480V, the bus will be in the 320~380V range using active clamping to prevent reaching 400V. Part of this decision was also rooted in arc-flash safety, I just don't want the battery voltage any higher than this from a liability perspective. (does everyone here know about arc-flash hazards? If not look it up, it's a very big deal!!)