Block Diagram For The Project

Title of activity: build a block diagram and do some research about the project

Objective: to understand the block diagram in detail

Content:- In this week, I had started to make block diagram. My advisors give some information and teach me how from base on the block diagram we do the project. Before design the block diagram, I should know full concept of the project and how does it work. A lot of useful information from advisor can be used to design block diagram

Result and Analysis

            Basic concept of control sytem

In general open loop control means that you send electrical signals to an actuator to perform a certain action, like connecting a motor to a battery for example. In this scheme of control, there is no any mean for your controller to make sure the task was performed correctly and it often needs human intervention to obtain accurate results. A very simple example of open loop control is the remote controller of an RC toy car; you - the human - have to constantly check the position and the velocity of the car to adapt to the situation and move the car to the desired place. But if it let the electronics handle a part, not all of the tasks performed by a human in an open loop controller, while obtaining more accurate results with extremely short response time? This is what called a closed loop control.

            In order to be able to build a closed loop controller, you need some mean of gaining information about the rotation of the shaft like the number of revolutions executed per second, or even the precise angle of the shaft. This source of information about the shaft of the motor is called “feed – back” because it sends backs information from the controlled actuator to the controller. shows clearly the difference between the two control schemes. Both type dshave a controller that gives orders to a driver, which is power circuit (usually an H Bridge) that drives the motor in the required direction.It is clear that the closed loop system is more complicated because it needs a 'shaft encoder' which is a device that will translate the rotation of the shaft into electrical signals that can be communicated to the controller. In other words, a closed loop controller will regulate the power delivered to the motor to reach the required velocity. If the motor is to turn faster than the required velocity, the controller will deliver less power to the motor. Controlling the electrical power delivered to the motors is usually done by Pulse Width Modulation.

• This is draft for my final project block diagram:-

closed loop controlled dc motor using PWM

Conclusion

Block diagram is the best referring diagram before start the project. I have learned the concept base on block diagram. Every each block has its own function.