On 20/04/17 08:13, The Natural Philosopher wrote:
On 20/04/17 08:10, Tim Watts wrote:

More poles = slower and higher torque, less poles = higher rpm.


What utter ********.

Perhaps you should check your facts before you go slagging people off:

https://en.wikipedia.org/wiki/Dahlan...changing_motor

I'll accept an apology when you've read that.


I have no idea if this method is used by any car motors but I think some
trains do - you can hear the "whirrr... drop pitch whirrr" which I can
only explain as pole changing as the motor is otherwise directly
connected to the axel.

However, I'm pretty sure most traction has at least one set of fixed
gears as motor rpms tend to be higher than desired wheel rpms.

Well even there you would be wrong. Its depends on how many poles the
motor is built with (as opposed to driven).

I could explain the theory, but you wouldn't understand it would you?


Perhaps you could try - or is it beneath you?