Inversion method of the dc motor controller

There are a lot of knowledge, dc motor controller below small make up to explain. When use dc motor controller, sometimes to be reversed, but many friends don't know how to move. Method is very simple, actually we are easy to master, said the below small make up the reverse way. 1. Through the study of the reverse connection of armature voltage on both ends, so as to change the direction of armature current. 2. Through the study of the change of the polarity of the excitation winding, which will be the main direction of the field to change.