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Try to gain as much advantage as possible when you do design reviews; they can result in greatly improved designs and can cut multiple iterations out of the process.
Let's start with why field weakening is useful: it produces a wider speed range for a motor - with a constant torque at lower speeds and an almost constant power capability at higher speeds.
I have a problem with a disc flexible shaft coupling that is used in screw compressors. This coupling is cracked and damaged after a short time, and the changing rate of this coupling is very high — about every 3 months. But as I understand from the machine manual, the coupling replacement may be every 8,000 hours or 12 months...