Do you need a capacitor?

[Dgonza9]

A lot of wiring diagrams for motorized barley crushers suggest a capacitor. Why? I thought a capacitor was only needed with a battery.

 

[ClaudiusB]

A lot of wiring diagrams for motorized barley crushers suggest a capacitor. Why? I thought a capacitor was only needed with a battery.

Some very basic info about motors

http://sawdustmaking.com/ELECTRIC MOTORS/electricmotors.html

Cheers,
ClaudiusB