3 ms·
A friend worked on a blender. The wattage number was derived from the inrush current when first turned on.
by m-ee 6y ago
A friend worked on a blender. The wattage number was derived from the inrush current when first turned on.
- namibj 6y agoTo be fair, that might be the current draw in stall.
- tesseract 6y agoThey are basically the same quantity - the motor doesn't care if the rotor is stopped because it's physically locked in place, or just because it was previously not running.
- laurent92 6y agoI don’t think so. Attempt the opposite experience: If you turn the motor, electricity comes out. So I don’t know what is the draw when stalling but I guess the draw must vary a lot even inside a north/south cycle. In fact, the draw varies enough during the cycle that it’s a well known method in industrial ecology to put a condenser on a 60Hz motors when the supply is 50Hz. So there must be a visible cycle.
- namibj 6y agoThe magnetic behavior of the windings can depend on this, though. A good example would be a toroidal transformer, which tends to have a high inrush current, even if the output is open circuit.
- amluto 6y agoI’m glad I don’t have that blender. :) (I’m the proud owner of a blender with a bona fide brushless motor. I don’t know specifically what type, but I suspect the inrush current is quite low. It also outputs considerably more power than most brushed motors can probably manage for any length of time.) edit: The product blurb says it’s an induction motor. The nameplate says 1000W. It would be fairly straightforward to estimate the efficiency by blending a known amount of water and measuring the temperature change over some period of time.