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Here's a warning though:
Field weakening can work with series wound DC motors. Forklifts used it for decades. You have to divert current around the field with a contactor and power resistor. This must be coordinated with the PWM controller so it does not chop when in FW. Long story short, it is a good way to damage the motor and/or controller unless the system is engineered to handle it. And then, it can buy another 10% top speed or so.
So 65 instead of 59?
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