Energy efficiency is a key driving force for the growing adoption of variable-speed drives in motor-control applications ... with three-phase induction or permanent-magnet BLDC (brushless-dc) motors ...

Approx circuit of DC-51 motor speed controller (D6 and D8 are the wrong way around ... that is near zero at zero revs and gets more negative as speed increases. The variable speed set point is ...

The AC7 and DC7 motor controllers are meant for vehicle designers who demand more—from control accuracy to rugged reliability ...

UPM and WPM variable-speed dc drives have been redesigned to comply ... UPM unfiltered controls provide basic speed control and operate from either 115 or 230 Vac (jumper selectable) at 50/60 ...

Afterwards, you will have lessons on AC motor control components and systems, both manual and automatic. This will culminate in training for you on AC variable speed drives. In module 3 you will learn ...

Ac drives control ac-induction motors and, like their dc counterparts, control speed ... phase motor starter with variablefrequency drive (VFD) permits the fan to operate at variable speeds.

His proof of concept is to use this as a variable-speed motor controller. The best part is ... a common jelybean MC34063A (PDF) switching DC-DC converter which costs about 10 cents on eBay ...