On Aug 31, 9:24*pm, wrote:
Talking of Dysons, the latest adverts talk about them being
"digital". How the H??? can a vacuum cleaner be digital? It's
an electric motor, that's conversion of electical energy into
motion energy, ie /electrical/, *NOT* electronic, and very
definitely not digital electronic.

JGH

Probably just a brushless motor driven by digital (PWM) signals. In
practice the inductance of the motor filters the drive waveform.

More than you probably want to know about motors he
http://focus.ti.com/download/trng/do...dium_2010..pdf

MBQ