Re: Is an induction motor a good thing for small appliances?


"Phil Allison" <philallison@xxxxxxxxxx> wrote in message
news:45nup8F7eud0U1@xxxxxxxxxxxxxxxxx

<needin4mation@xxxxxxxxx>

<snip>

Then I read the food processor has an induction motor. I have been
reading about various induction motors on wikipedia and other places.

I am trying to find out why an induction motor in this food processor
is a good thing or if it matters if it is an induction motor.


** Induction motors have very long, maintenance free lives - plus they
are
nice and quiet.

Nearly all fans, bench drills and large electrical machines use induction
motors - so did an amasing Braun juice extractor I once owned.

But, their power to weight and torque /rpm curve is *much* poorer than
common "universal" or AC/DC motors you find with hand held power tools,
sewing machines, vacuum cleaners etc.


There is a trend toward using three phase induction motors in newer
appliances, although I thought it would be mostly washing machines and air
conditioners. The recent introduction of inexpensive single chip 3 phase VF
controllers in the FHP and up to about 3 HP range has made it practical to
use three phase motors in non-industrial environments. The motors themselves
are very simple to construct, and are extremely reliable and maintenance
free, with just a rotor, a couple of bearings, and a stator. No external
start/run capacitors are required, and no inefficient shaded poles. No
centrifugal switches or sparking brushes to break or wear out. Just a $10
IC, which includes built-in adjustable speed and torque control, soft start,
dynamic braking, overload protection, and even regeneration. The system
actually works on a DC "link", which could be supplied by a bank of
batteries. The three phase motor is indeed an elegant work of art, pioneered
by Nikola Tesla over 100 years ago.

Paul E. Schoen
www.pstech-inc.com


.

Relevant Pages

  • Re: Is an induction motor a good thing for small appliances?
    ... Paul E. Schoen wrote: ... reading about various induction motors on wikipedia and other places. ... bench drills and large electrical machines use induction ... use three phase motors in non-industrial environments. ...
    (sci.electronics.design)
  • Re: Induction Motor Design
    ... >pole faces, stator slots, insulation systems etc etc) up to a few MW at ... THE PERFORMANCE AND DESIGN OF ALTERNATING CURRENT MACHINES: ... Three-phase Induction Motors and Synchronous Machines. ...
    (sci.electronics.design)