I don't see how the speed would go up with the field winding not connected.
It's a counterintuitive result, but to increase speed of a DC motor you _reduce_ the field strength. That's why an unloaded series-wound motor will spin itself to destruction, there's not enough mechanical load to soak up the energy, and the field strength goes down as the back-emf of the spinning armature goes up (with RPM). It's a runaway cycle. Series-wound motors are fairly rare. Parallel-wound, or series-parallel wound are more common. -- Jim _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
