Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Paul & Sabrina's cheap DIY 144v motor controller

MPaulHolmes · 12-04-2014, 05:07 PM

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?

12-04-2014, 05:07 PM	#6955 (permalink)
MPaulHolmes PaulH Join Date: Feb 2008 Location: Maricopa, AZ (sort of. Actually outside of town) Posts: 3,832 Michael's Electric Beetle - '71 Volkswagen Superbeetle 500000 Thanks: 1,362 Thanked 1,202 Times in 765 Posts	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? __________________ kits and boards