So I am going to build a robot arm (4R arm, each joint is actuated by BLDC motor) and currently in the planning phase. I know the basic structure of the robot and the end application of it. I thought of making my own motion controller but this task is very complicated to make something that is reasonably accurate. On ther other hand, popular motion controllers in the market are very expensive (5k USD and more) while my budget is around 1k USD for a motion controller.
What motion controller do you recommend and do you know any company that sells controllers that are good enough but in the range of 1k USD?