Stepper, Servo or DC Motor! Which one should use in a robotic project? it is a very common question for any robotic lover and its answer is ….. as every one knows that for any robotics project we need some actuator. Our design is based on actuator. In industry many options are available for actuator like pneumatic air system or hydraulic system, but for a robotic project at small scale we can’t use this type of actuator. Here for us small electric motors are available which is very good option of actuator. Electric motors can be used to actuate you robot parts like Arms, Legs, Wheel or any other part.
Here in this article I will focus on electric motors type and it application with pro and con….
so lets start…
Basically there are three types of electric motors are available in markets. These are
Stepper Motors are electric motor (DC) and rotate in steps. These steps define by its coils arrangement. In stepper motor there are multiple coils which are organized in a group. When we supply power in a phase, it`s shaft will rotate one step. To use stepper motor we required some programmable device like microcontroller of computer. But these motors have very good accuracy.
Servo motors are a combination of DC motor with a feedback sensor system. Servo motors have a precise control over Speed whereas stepper motors on position. These motors are very important in a RC controlled flying Toys.
These are the simplest motors which we can use in robotics. DC Motor is also called continuous motors because shaft stops only when you switch off power source. Also if we change polarity its rotation direction also changes.
Selection of Electric Motor
Selections of motors are not an easy task. For selecting a motor you should know the purpose of your robot and also advantages and disadvantages of different motors.
Here in given table you can easily go throw pro & cons of different Motors (only for student projects)
Pro & Cons of these Electric Motors
It is very good for position control but it required a programmable device to operate. It is also expensive with respect to DC motor
It has very good for speed control and available in different standard sizes but required a special driving circuit.
It is easy to control but there is no speed control option. Well by gear box assembly you can control its speed.
Grab it from your old toys
The best idea to get these motors is remove it from your old nonworking toy. In toys you can get different DC Motors. Collect it and use as per your requirement. Well May be it is not fix in your robot but be patient it will work in other project.
So at last selection of a motor is based on many parameters. Here in this article you have learnt about some basic difference in stepper, servo and DC motors. And surely it will help you to decide and choose a specific motor in your robotic project.
Imagine your idea and create your world.