Thread Number: 77941
/ Tag: Modern Automatic Washers
energy 'saving'??? |
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Post# 1019672 , Reply# 1   1/1/2019 at 07:57 (1,913 days old) by arbilab (Ft Worth TX (Ridglea))   |   | |
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Small motors draw twice their nameplate 'full load amps' when stalled. Operating normally, that's on the order of a half second. If a small motor takes much longer to start than that, it's in trouble and seconds from overtemp cutoff. At home you pay for Watts x hours. 1 W for 10hrs, 10W for 1 hour, 100W for 6min, all exactly the same. So the cost of starting the motor is 'measurable' but insignificant.
Industrial motors like you said, drive a flywheel which must be brought up to speed. Their motors typically have elaborate provisions for startup. 1) so it doesn't strain the motor and 2) since industrial electric rates are scaled to peak kW demand rather than simple W x hours.
Yes, recent machines tend toward 'brushless'. Internally they are 3-phase motors and since homes seldom have 3-ph service the motor controller creates the phases. It can also sense load, reduce power when less is needed, change directions, control speed and acceleration.
Such motors are not "new" but migrated to home laundry as the designs and parts became 'production' rather than 'custom'. Like what happened to flatpanel displays; very expensive when first introduced and now around 1/10th~1/20th as much. Before that, it was cheaper to just throw a plain-old motor in there. Now, in many applications the improved motor allows the transmission to be much simplified or done away with altogether. |
Post# 1019703 , Reply# 2   1/1/2019 at 13:14 (1,913 days old) by DADoES (TX, U.S. of A.)   |   | |
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Fisher & Paykel developed the use of the 3-phase "pancake" direct-drive motor in washers with their SmartDrive design, yes? I checked the wattage draw with a Kill-a-Watt meter on one of my machines. There's a gradual increase as spin speed ramps up. Standby = 4.5 watts. Control on = 5.4 watts. Pump running (standard 120v) = 103 watts. SmartDrive "surge" at spin start = 122 watts. 670 RPM = 242 watts. 1,010 RPM = 328 to 341 watts. Compared to a WP DD. 685 to 521 watts high spin. 535 to 419 watts low spin. 288 watts low agitate (no water). |
Post# 1019723 , Reply# 3   1/1/2019 at 14:56 (1,913 days old) by Eronie (Flushing Michigan)   |   | |
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Odd the FnP stator has Whirlpool stamped right on it. |
Post# 1019728 , Reply# 4   1/1/2019 at 15:23 (1,913 days old) by DADoES (TX, U.S. of A.)   |   | |
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