variable speed drive (single-phase Induction Motor)
Posted 31 December 2005 - 03:42 PM
Posted 31 December 2005 - 07:38 PM
and Varidigm http://www.varidigm...... 15-1003A.pdf
Both of those only work on PSC (Permanent Split capacitor) motors, which are low torque designs suitable for pumps and fans, but not much else. They can technically be used on Shaded Pole motors as well, but then again, those can be controlled with simpler rheostats anyway so it doesn't make much sense. All other 1 phase motor designs use a speed switch and starting capacitors, making them unsuitable for use in transistorized drives.
If you are thinking about entering the business, I would do some serious investigation as to why. The fact that you don't already know all this shows that maybe it would not be a good idea. It is a limited market and from what I have heard, neither of these two companies sell a lot of these drives, they both have other products that keep them in business.
Posted 22 January 2006 - 09:01 PM
There are some single phase motors that are designed for high slip. These motors are generally a integral part of a fan assembly and can be speed controlled by variable voltage only. This is not true for standard induction motors.
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