UK LG Tumble Speed - NIck Uk?

[aquarius1984]

Nick can you help me?

i dont really know alot about machines apart from motor brush and other basic repairs, you mentioned about altering the tacho on your hottie
do LG direct drive motors (brushless motor mounted directly onto outer tub. for the benefit of our friends wondering what im on about) have a tacho? what does it do and how do you know how fast the tumble speed is? the LG i have is very fast when washing cottons i would say it looks very like a servis quartz 60Rpm but am not sure (does anybody know the tumble speed?) and if LG are below 60 how can i speed it up?

if it is 60 rpm or more Well Done LG.

to get it to really look like a quartz i fill it up on synthetics which has the same level as a quartz on a cotton full load (about 1/3 way up the door AND i have a 6Kg load) and pause the prog to reset to cottons. great splashy action but no motor noise .....sob sob

Help appreaciated by anybody who knows about UK LGs

 

[nickuk]

Tacho

Hi Aquarius1984

My knowledge is also fairly patchy - a helpful third party actually advised me on how to adjust the tacho on the Hotpoint which was really simple - a gold barrel on the end of the motor is clicked round clockwise to make it go faster and anti clockwise to slow it down.

As far as I know, it is much harder to adjust the speed of an induction motor, though my information is probably very out of date! You never used to get an infinitely variable spin speed via a dial with an induction motor machine. The speed is varied by something to do with power supplied to the motor poles, and so an induction motor on spin will do say 400 / 800 / 1200, but a brush motor in theory can do any speed you want it to by means of what I believe is a variable resistor. I wouldn't therefore have thought that precise control of a tumble speed is possible with an induction motor and would suspect there is no tachometer on it.

Suspect other such as Mike, Steve, Jon etc may be able to correct my errors in the previous paragraph.........

We're just about to install an LG at work. Thanks for tip about programming it! I can't do anything like that on the Zanussi because whenever you pause and change programs the machine automatically pumps out. I aw waiting on one spare part for the Hottie (the neon indicator lamp) then she is good to go. Apart from that it's totally restored. I go on Holiday on Saturday to The Peak District for a week, but soon after there will be a vid if anyone wants one.

Regards

Nick

 

[sparkcymru]

LG brushless

Hiya, well i've worked on 6 of these. I believe the motor speed is managed by the module altering the voltage from feedback it receives from the position of the rotor itself. I've never had to take the rotor apart on one but from diagrams of its parts there seems nothing that constitues a tacho. I would estimate the tumble speed is about 60rpm as it looks similar to the speed of a quartz as you say. They are very very quiet in action, too quiet for me lol. The pump is the nosiest part and i think as there is no real motor noise you certainly hear every squeek and rattle from them. I love Lg's but actually prefer the older belt drive ones cause i like to hear the motor going.

Pictured is my belt driven brushless motor version rather than the direct drive, this made a noise i would describe as a bumblebee and was rather sweet. The motor was tiny.

Steve

 

[gizmo]

the direct drive units use borrowed (stolen) Fisher and Paykel technology. There is no tacho as such. It uses a different motor technology again - not brush motor and not induction motor. It is a type of stepper motor. There are three windings in the motor and a set of permanent magnets in the rotor. The windings can be switched on singly or in pairs, and with polarity either way around. Each combination will cause the rotor to jump to a particular alignment. Each change in power to windings causes the rotor to advance another "step". So continuous rotation is achieved by the microprocessor energising the windings in a particular sequence of switching. The speed and direction of rotation is controlled by the speed of changing which windings are energised. each movement is an individual "step", the rotor will stay in that spot till a new winding pattern is energised. There is no need for a tacho with this system. Computer disc drives use similar technology.

F&P use a position sensor to confirm to the processor that the programmed movement is actually occurring, but this is a feedback circuit to monitor for faults and overloads, it is not an inherent part of the motor drive circuitry. The position sensor is a small circuit board mounted up next to the windings, where it can detect the permanent magnets in the rotor moving past.

Chris.

 

[aquarius1984]

afterthoughts

Nick

the LG is my folks and apart from watching every now and again i have established a few things

20 mins into the wash prog any extra water i added via synthetics is pumped away so the remaining level is very low. but at least the washing is well wetted.

cotton wash with a small load uses more water than a full load
at 2/3 full the water comes up to the base of the door seal (about 2 mins fill and tumble)
however

with it jam packed it takes one minute fill (no tumble) and adds water in 10 second bursts when it feels like it. the wash is useless and the rinse! ha ha ha

washed full load with persil colour powder no comfort and after 3 rinses when i took the washing out there was a white talc powderey residue all over the drum. if you want a decent wash especially for whites i would select cottons at 90/60 and let it wash adding about 3-4 litres water this will wet washing more but not cause the pump to kick in. then when it pumps out wash water (catch it in time before it empties) i set it to synthetics on cold temp and let it complete the cycle.
something else interesting is that on synthetics you can select a full 13 mins 1200rpm spin. better rinse and wash i think as it fills to the normal full load servis Q level.

i can also set the 30 min quck wash with any spin speed and all that happens is with 1200 it adds 6 mins to the prog time great really.

wool also gets the option to have 1200 which is unusual these days as hotpoints and hoover logics were the only machines i recall being able to fast spin woolies.

i would have considered an LG for myself but they are useless STAY CLEAR

i now have (thanks to lavamatjon) set my eyes on the beuatiful MIELES. gotta love them well built machines with wacky high water level rinses!

Toodle ooo for now

anybody who ever wants to reply to any of my threads is welcome to do so. any info is appreciated

 

[aquarius1984]

also

i noticed that it is only capable of tumbling at 60 rpm. the tumble times are long for cottons bit shorter for synths and short for wool delicates etc unusual or what?

 

[sparkcymru]

LG water level

Hmm that sounds interesting about a full load in the LG. I'm not sure thats correct, i've not seen one do that, they wash n rinse really well on full load normally. i'm guessing urs is a model with a weight sensor to weigh the load to work out water levels. Anyway as i've said on here before i've sold and warranteed quite a few Lg machines plus many of my freinds have them and none have failed so will happily recommend them.
Steve