Browsing by Author "Abdullah, Bilal"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Brushless Dc Motor Controller
    (University of Management and Technology, 2013) Abdullah, Bilal; Anwar ul haq; Talat, Taimoor
    Electrical equipment often has at least one motor used to rotate or displace an object from its initial position. There are a variety of motor types available in the market, including induction motors, servomotors, DC motors (brushed and brushless), etc. Depending upon the application requirements, a particular motor can be selected. However, a current trend is that most new designs are moving towards Brushless DC motors, popularly known as BLDC motors. Brushless DC motors (BLDCM) are generated by virtually inverting the stator and rotor of simple DC motors. By removing of brushes we can eliminate many problems associated with brushes. Another advantage is the ability to produce a larger torque because of the rectangular interaction between current and flux. Classical DC motors are no doubt good and simple but inefficient in some ways. Although dc motors possess good control characteristics but their performance and applications are limited due to sparking and commutation problems. The Brushless DC (BLDC) motor is able to overcome the limitations mentioned above and satisfy the requirements of a variable speed drive. BLDC motors have many similarities to AC induction motors and brushed DC motors in terms of construction and working principles respectively. Like all other motors, BLDC motors also have a rotor and a stator.
  • Thumbnail Image
    Item
    Car crash prevention system using radar and ultrasonic sensors
    (University of Management and Technology, 2013) Abrar, Anas; Abdullah, Bilal; Khan, Farrukh Zaman
    The objective of this project is to develop a prototype model that can prevent crash presentation in cars using radar and ultrasonic sensors. The main aim of this project is to prevent the collision on the road. Many methods have to be followed to prevent the collision on the road, but here radarand ultrasonic sensors are being used. The mother board used as a microcontroller provides some additional features for future enhancement. This project consists of two major units 1) Transmitter Unit and 2) Receiver Unit. This project comprises of three major parts the first one is radar system that is used in the front side which will measure the speed of the hurdle or the automobile and in the front and eventually will calculate the distance between the object and the car in which my system is installed. The second part consists of the side view systems in which ultrasonic sensors are used to calculate the distance between the car and the other car in its side. And the third portion is of the software base in which arduino software and the arduino mother board is used in which all the inputs of the radar, ultrasonic sensors and the hall effect sensors will be given so that the motherboard can take the action against this reaction by applying the brakes using DC motor.The data can be processed by the controller, and drives the motors in the opposite direction. All the status about transmitter end is displayed in LCD. The controller also initiates the Buzzer. This unit is placed in the Car.