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'[EE] - Water saving - was - Legacy portsfor people'
2008\11\12@105516 by Martin

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Olin Lathrop wrote:
> Martin wrote:
>> Indeed. The side loaders tend to be significantly more energy
>> efficient, having BLDC motors integrated as part of the drum. They
>> also wring more water out of the clothes because they spin faster.
>
> This doesn't add up.  While some models might use more or less efficient
> motors, I don't see why either side or top loading dictates a particular
> type of motor and therefore has a inherent efficiency advantage in the
> motor.

It doesn't dictate the type of motor, but that's the way it is. I've
never seen a top loader with an efficient motor. That doesn't mean they
don't exist.

>
> The same applies to spinning faster.  I can't think of any reason why a side
> loader should be able to spin inherently faster.  If anything, it seems top
> loading might have a slight advantage since the load is more likely to be
> evenly distributed and therefore can be spun faster with less shake, which
> is probably the limiting factor on spin speed anyway.

They can spin faster because they can and often do auto-balance the
clothes. Without the use of gravity (as in a top-loader) it is difficult
to move clothes around to balance the load with just a rotating motion.

-
Martin

2008\11\12@192931 by Carl Denk

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Was said:
> In modern top loading machines that I am aware of the drive,
> whether of agitator or drum, is provided by a direct drive multiphase motor.
In our say 10 year old Maytag top loader, the drum (rotates for spin
cycle) and agitator set on top of a a gearbox. Rotates one direction for
spin, and other direction for agitate. The ordinary looking reversible
AC motor drives the gearbox with a V-belt.
> Re spinning - I'd think that, once spinning with any speed, the g forces in
> a horizontal axis machine would balance the load nicely around the drum and
> that there would be relatively minimal torque variations during the cycle. g
> forces are easily calculated - but I haven't done it (how fast DO they
> spin?)
>  
The spin might be more than 60 RPM probably, and is sufficient to cause
an out of balance condition. Clothes like a large load of bath towels or
bedding occasionally bunches together toward one side, and a limit
switch will shut down the washer including a loud warning buzzer. The
motor, etc. is sized sufficiently that loading does not create a low
speed condition.

The water level, temperature, and water saver are all manually selectable

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