PIC Microcontroller Projects in C, 2nd Edition

Project 7.22—DC Motor Control Projects—Simple Motor Drive

DC motors are used in many industrial, commercial, and domestic applications. In this project, a DC motor is controlled by rotating it in either the clockwise or anticlockwise direction.

A simplified electrical circuit diagram of a DC motor is shown in Figure 7.172.

The motor torque is proportional to the current through the motor:

T=KTi.

(7.2)

The back emf is given by

Ve=Kew,

(7.3)

Where w is the motor angular speed (radians per second). We can write the following formula for the motor circuit: ...