A Question about a Rice Cooker :O)
 

Hi, thanks for looking at my post.

The Rice cooker in question is from China where they use 220 volt 50
hertz. I want to hook it up to 220 volt 60 hertz.

In case you've never seen a rice cooker, it has a paddle switch that
you press down to put it into "cooking mode" and then after a time the
switch moves by itself to "keep warm" mode. This one also has a toggle
switch for cooking "rice" or "soup."

I'm pretty sure the heating element won't mind the different frequency
but do you think the timer or whatever it is that moves the switch will
be adversely affected?

Thanks for your help, Richard

On 30 Sep 2005 10:06:14 -0700, wrote:

Hi, thanks for looking at my post.

The Rice cooker in question is from China where they use 220 volt 50
hertz. I want to hook it up to 220 volt 60 hertz.

In case you've never seen a rice cooker, it has a paddle switch that
you press down to put it into "cooking mode" and then after a time the
switch moves by itself to "keep warm" mode. This one also has a toggle
switch for cooking "rice" or "soup."

I'm pretty sure the heating element won't mind the different frequency
but do you think the timer or whatever it is that moves the switch will
be adversely affected?

Thanks for your help, Richard

It is unlikely you'll hurt it by running on a higher frequency. If it
is a line referenced timer it would time out sooner, but it may have
an independent time base or just sense moisture or temperature rise.

Clock motors and transformers run cooler on 60 versus 50, and motors
run faster.

If it is necessary to put a fixed volume of rice and water in it, each
time you use it, it is likely they do use some kind of timer. If you
can vary the amount of rice, chances are it senses the rate of
temperature rise, or temperature above boiling as the water is
absorbed and vaporized.


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On 30 Sep 2005 10:06:14 -0700, wrote:

Hi, thanks for looking at my post.

The Rice cooker in question is from China where they use 220 volt 50
hertz. I want to hook it up to 220 volt 60 hertz.

In case you've never seen a rice cooker, it has a paddle switch that
you press down to put it into "cooking mode" and then after a time the
switch moves by itself to "keep warm" mode. This one also has a toggle
switch for cooking "rice" or "soup."

I'm pretty sure the heating element won't mind the different frequency
but do you think the timer or whatever it is that moves the switch will
be adversely affected?

Thanks for your help, Richard

It is unlikely you'll hurt it by running on a higher frequency. If it
is a line referenced timer it would time out sooner, but it may have
an independent time base or just sense moisture or temperature rise.

Clock motors and transformers run cooler on 60 versus 50, and motors
run faster.

If it is necessary to put a fixed volume of rice and water in it, each
time you use it, it is likely they do use some kind of timer. If you
can vary the amount of rice, chances are it senses the rate of
temperature rise, or temperature above boiling as the water is
absorbed and vaporized.


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Newsgroups
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I think most rice cookers work on the temperature rise principle using the
water absorption cooking method. That's why you follow the instructions for
x amount of water to y amount of rice. The proportion of rice to water sets
the cook time. You can vary proportions to get undercooked or overcooked
rice. They use a thin metal pot with not much thermal mass so that a temp
sensing switch pressed against the bottom from outside detects the temp of
the contents. While there's free water, the temp remains at or below 212deg
due to that being the boiling point of water. Soon as the water is all
absorbed, the temp of the metal rises, temp switch trips and reduces
element power to "keep warm" mode.
I used to wonder how they worked myself until I read about it on
www.howstuffworks.com
Then when I actually took a busted one apart I found it to be exactly as
described.
PH

Thanks very much! The rice cooker is working fine with that "extra 10
hertz" doesn't seem to have affected the unit's operation at all.

RivaRich

On 2005-09-30, wrote:
Hi, thanks for looking at my post.

The Rice cooker in question is from China where they use 220 volt 50
hertz. I want to hook it up to 220 volt 60 hertz.

should be fine.

In case you've never seen a rice cooker, it has a paddle switch that
you press down to put it into "cooking mode" and then after a time the
switch moves by itself to "keep warm" mode. This one also has a toggle
switch for cooking "rice" or "soup."

I'm pretty sure the heating element won't mind the different frequency
but do you think the timer or whatever it is that moves the switch will
be adversely affected?

the one I saw had a heat sensor that did that... (it was spring-loaded to
contact the base of the cooking vessel)

if it's done with a synchronous timer you may find that it turns down the heat
too soon.



Bye.
Jasen

A Question about a Rice Cooker :O)
 

On Fri, 30 Sep 2005 10:06:14 -0700, rivarich wrote:

Hi, thanks for looking at my post.

The Rice cooker in question is from China where they use 220 volt 50
hertz. I want to hook it up to 220 volt 60 hertz.

In case you've never seen a rice cooker, it has a paddle switch that
you press down to put it into "cooking mode" and then after a time the
switch moves by itself to "keep warm" mode. This one also has a toggle
switch for cooking "rice" or "soup."

I'm pretty sure the heating element won't mind the different frequency
but do you think the timer or whatever it is that moves the switch will
be adversely affected?

Thanks for your help, Richard

The rice cookers I've heard of don't use a timer - they use a
thermostat. While the water is simmering, it won't go above 212F (100C).
As soon as the water boils dry, the temp. of the chamber starts to
climb, and that trips it off. For soup, they probably just have a
different set point - I had a little two-cup instant boiler for
coffee water that as soon as the water reached boiling, it would
click off.

I'd say, go ahead and do it - a couple of cups of rice is almost
free, and you won't hurt the cooker.

Cheers!
Rich