According to previous knowledge permanent magnet motors (PMMs) in ESP service can only be used with SPECIAL variable speed drives (VSDs). Now a US company claims their PMMs can use the SAME VSD as conventional, induction type electric motors. Anyone having any experience with this problem, I would appreciate their comments.
I guess the problem is the torque you want to apply. Usually with elecrtic motors you can only apply a certain torque. This is usually too low for ESP operation. With a variable gear you can adjust this torque.
At higher speeds this VSD does not help anymore.
I recommend to use a conventional brake system for ESP.
Thanks for your message. I still have the problem that some people say the permanent motor ESP units can be driven with conventional VSDs.
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