Quote Originally Posted by CatFan View Post
A big advantage of the variable speed motors is power consumption. A 5-speed motor uses a speed coil to control motor speed. They use full power at all settings, with the extra being given off as heat. The variable pulses the power on and off rapidly to control the motor speed. This can increase battery life quite a bit at any speed lower than 100%.
I agree.

The only problem with PWM vs speed coils is that the Variable has a much higher failure rate. MHO

This can be verified by any repair shop.