Subject matter, wherein an electromagnet is carried by and rotates with one of the driving and driven parts and electric current is supplied to the electromagnet by a connection including brushes and rotary contacts.
(Subject matter; rotates; with one of the driving and driven parts) (electric current; is supplied; to the electromagnet; by a connection including brushes and rotary contacts)
Subject matter electric current
rotates is supplied
with one of the driving and driven parts
to the electromagnet by a connection including brushes and rotary contacts