Laboratory Stirrer

http://www.bing.com/search?q=laboratory+bench+stirrers&src=IE-SearchBox&Form=IE8SRC

1/8 HP sounds a lot for stirring just 1000ml of castor oil. I would have thought just a few whats would be enough.

What speed, or speed range, do you want the motor to cover?

A stepper motor would be ok for slow speeds (less than, say, 1500rpm), but still needs a controller.

A small BLDC (brushless dc) motor with integrated controller might do the job.

In that case a small stepper motor (or servomotor) could be used. It will run well at these speeds, and can be controlled for constant speed. The alternative would be a BLDC motor with a gearbox.

What comes to mind is a variable speed rotary tool.

Shown is a DREMEL™ Fortiflex. This one has variable speed 0-20K RPM, heavy duty flex shaft... blah, blah, blah. This is simply an example, there are many manufacturers of this sort of thing with many options.

http://www.choiceful.com/choiceful-id-9472-Draper-Paint-Stirrer-613mm-Length-x-103mm-Diameter.html

I am not sure I would select that to stir 2 cups (or 16 ounces, or 500ml) of liquid.

Magnetic stirrers are widely used for that much of qty, example (Its not an endorsement)

Respected Sir,

Thank you.for the time sparred.

But sir,

If I want to conduct an experiment , reaction involving heatuing / etc I have to put up only in geared type of stirrers only . I have worked with some german company- ie - where the stirring rod can go thro the chuck / & they are very compact. The motors were very small.

I wonder like tihs type are not available in INDIA or I do not know what is the reason . i have seen REMI company products etc , but Ithough I am using their stirrer only I am not happy with the design or type etc.

Regards,

vijayakumar

Well, if somebody doesn't like the other idea, how about a real lab mixer?

These guys make all sorts of them.