Thread Number: 58201
/ Tag: Vintage Automatic Washers
POD - 2015/02/01 |
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Post# 807002 , Reply# 1   2/1/2015 at 04:42 (3,370 days old) by arbilab (Ft Worth TX (Ridglea))   |   | |
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Indeed, how did variable speed work? Induction motors can't readily be made happy at speeds other than their number of poles. Even variable-frequency drive-- difficult to implement at any power and range to speak of-- doesn't work well as that changes impedance. Duty-cycle choppers like incandescent dimmers don't work well either. Motor BEMF tends to overheat/explode the dimmer, and the motor itself tends to stall/overheat as its duty cycle is reduced.
What decade was the Versatronic? Solidstate DC drive wasn't particularly practical until suitable components were developed. Neither was electronically-commutated multiphase (forgot the word it's commonly called today, pre-alzheimers). Strongly suspect the above problems and compromised solutions led to the reliability deficit. |
Post# 807219 , Reply# 4   2/2/2015 at 01:23 (3,369 days old) by qualin (Canada)   |   | |
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Hmm.. I can see this system having a short lifespan due to GE getting tired of having to replace burnt clutches from lots of customers using gentle cycles on a frequent basis. |
Post# 807252 , Reply# 5   2/2/2015 at 06:56 (3,369 days old) by combo52 (50 Year Repair Tech Beltsville,Md)   |   | |
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This was a VERY short lived idea that failed quickly for several reasons. About 1967-69.
1; It did not solve ANY washing problems for the user of the washer, many brands already had three speed washers that were just as gentile at washing.
2; The speed control system was expensive to build and in Frigidaire and GEs case troublesome.
3; The only reason that these machines were ever built was because the technology made it possible and the male engineers thought they had solved every women's most pressing wash-day problem and it became a misguided race between many of the major washer manufactures to bring it to market quickly. I don't think that anyone ever stopped to consider whether it made any difference whether you clothing was spinning at 370 RPMs or 425 RPMs, or again whether the agitation was 54 SPM or 57 SPM, having such a fine adjustment just would not make any difference to the final result.
Interestingly GE and FD each came up with very different clutch systems that allowed constant slippage when the washer was not set for full speed operation.
Interestingly again GE made the variable speed induction motors that all the other makers used in their infinite speed controlled washers.
Norge had one and also made a re-badged Wards Signature with this feature.
Hotpoint Solid Tub washers had this feature, and HP was building Easy washers by this time and Easy also had one.
And not to be left out Whirlpool made one for Sears on a LKM model, but it never appeared on a WP branded machine.
And wisely Maytag , Westinghouse, Speed Queen and a few others resisted this costly mistake.
John L. |