Quote:
|
Originally Posted by Butcher
Eh? An AC motor will always spin the same way, so you can use curved blades if desired. AC fans work after all.
|
In case of these Aquarium Mag pumps (eheim, maxijet, resun, via aqua, hydor), which use magnetic rotor (instead of iron build), the spin is "crazy". That is the reason of many starting noise, like "clicks" inside volute.
Quote:
|
Originally Posted by MAG DRIVE WATER PUMP by EUGENE DANNER
Uses half the power of conventional pumps.
Only one moving part means that there aren't any seals to wear out. Approved for indoor and outdoor use. The Mag-Drive utility pump is a magnetically-driven, submersible pump. This unique energy-efficient design uses only one moving part - a ceramic/magnetic impeller. Originally conceived as a circulating pump for fresh and saltwater aquariums and ponds, the Mag-Drive's inherent characteristics make it ideal for pool maintenance applications as well.
|
Iwaki ones use conventional iron rotor and have a direction so can use curved blades.
Quote:
|
Originally Posted by http://www.iwakiwalchem.com
Use of impeller trim allows smaller package and selection of more efficient pumps. High-efficiency closed impellers are a separate component that mates to the magnet capsule. This precise trim, along with an optimized bearing system, provides an extremely long service life.
Iwaki America offers specialized impeller designs that provide specific performance curve shapes. Our 6Z, 20Z, 30Z and 70Z are prime examples showing low flow high discharge pressure curve shapes.
For OEM applications we will design an impeller to meet a specific duty point and curve shape. These impellers offer solutions for specific applications that require a flat curve vs.a steep curve and for those applications where the available power for the motor is limited. By designing an application specific impeller we may be able to also offer a smaller package product where space is limited.
|
