speed contraller

hey guys,

simple question,

can anybody tell me ,, when exactly we need to use speed contrallers in robots,,

am making a two wheeled robot with cylindrical body,, do i need speed conraller or not?

The main deciding factor is probably related to the current requirements of you intended motors. Do you have any in mind?

More like you require a speed controller if the motor is capable of going faster than you require. If the motor speed is suitable and you want to control its acceleration you will require a speed controller. If the in-rush current during uncontrolled acceleration (the motor running up to full speed from a stopped condition) is greater than your power source can supply, you will require a speed controller. If you want to reverse the motor whilst in motion you will require a speed controller.

In fact for any reason other than the most basic system you will find a speed controller a desirable feature