There are many uses for pwm signals, eg you can control dc motor speed using pwm. It is a special module in pic microcontroller designed for modulation and waveform generation applications. Apart from these techniques, pulse width modulation is the effective way to implement motor speed control. Picmicro dc motor control tips n tricks microchip technology. Design and implementation of dc motor speed control based on tms microcontroller. Microcontroller based dc motor speed control using pwm technique.
Body control module system engineer at ford motor company. This post provides the pwm code using c language and proteus simulation for pic18f452 micro controller ccp1 and ccp2 modules written using mplab and hitech c18 compiler. In controlling the speed of a brushed dc motor, there are two costeffective. In the below circuit four switches are provided for controlling the duty ratio of pwm generated by two ccp modules of the pic microcontroller. We all know that motor requires more current, so resistors with higher power rating are required to drop excess energy. This module of pic microcontroller contains a 16bit register which can operate as 16bit capture register. Dc motor control tips n tricks chapter 5 dc motor control. Free energy generator using neodymium magnet activity. Design and implementation of dc motor speed control based. Controlling the speed of dc motor can be done by different ways like using a potentiometer and also by a controlled current to the armature. Bidirectional speed control of dc motor based on pulse width modulation.
With a bldc motor, all that would be required is a current proportionate to the external forceallowing for more power efficient control. The pic16f877a microcontroller is programmed to generate. Proteus is the most flexible and cost effective design solution for all simple and. More details about the operation of ccp modules in. We as programmers are in charge of setting the output frequency for the pwm signal as well as its duty cycle. Compare ccp and pulse width modulation pwm modules can be used to an operate a. Using pwm module is far more easier and cost effective than using extra chips for pwm. The plant consists of a servo dc motor in parallel.
The application notes can be found on the microchip web site at. But bldc motors are better suited to controlling the force. Ccp capturecomparepwm is inbuilt in tms which can easily generate pwm signal. A basic example provides simple speed control of a dc motor using f3xx mcus. In terms of power consumption, this method of speed control is a far more efficient way to vary the speed of a bdc motor. Generating pwm with pic microcontroller using ccp module. Pdf microcontroller based dc motor speed control using. Pic microcontrollers provide 2 costeffective methods for brushed. The stator generates a stationary magnetic field that surrounds the. Pwm is the best and easy way to control speed of dc motors. And with a stepper motor, holding the position of a structure such as a robot arm would require a relatively large and continuous current. Servo motor with pic microcontroller programming c code mplab xc8. The quantity of motors produced is roughly inversely proportional to the power level. Pdf speed control of bldc motor using pwm technique.
Sir, can you tell us how can we control a motor both dc and ac using pid. Software techniques for building more efficient motor control designs. Back emf is more costeffective than other speed feedback. Brushed dc motors are widely used in applications ranging from toys to. Dc motor speed control using pwm with pic microcontroller. There is a possibility to control more than one dc motor drives which are supplied. I thinks the program is self explanatory, so if you have any doubts please. Due to flexibility of microcontroller all control algorithms can be implemented in software. In this tutorial we are using pic 16f877a for demonstrating pwm generation using ccp module.
The pwm signal is being used for motor speed control, led dimming, solar chargers and much more as well see in future tutorials. Brushed dc motor fundamentals microchip technology. The following algorithms are designed to efficiently produce an 8bit pwm output on the midrange family of picmicro microcontrollers. Dc motor speed control using pwm with pic microcontroller mikroc. Pdf dual dc motor speed control based on two independent. Abhilash motarwar body control module system engineer. However, the module 0 mode sfr is not initializedfor 8bit pwm. The software and control algorithm of the implemented. Generating pwm with pic microcontroller mikroc pro. Pwm can be easily generated using the inbuilt ccp module of a pic microcontroller. If cost is a critical design point, a picmicro device with a ccp module may not be available, so software generated pwm is a good alternative. Speed control of dc motor using capturecomparepulse. Pdf bidirectional speed control of dc motor based on pulse. We all know that motor requires more current, so resistors with higher power rating.
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