VII. APPLICATION EXAMPLES
The application of microprocessors and digital IC's in motion control is a very broad issue and cannot be adequately covered without going into a very detailed description of every work. Nevertheless, we can have a general idea on the current development trends in examining typical recent research and development works on the subject. In this section, some digital motion control systems are described in which microcontrollers and advanced microprocessors are used to implement control functions.
A. Brushless DC Motor Control without Position and Speed Sensors
In this work a control strategy for a brushless dc motor without position and speed sensors is presented. A DSP (Texas Instruments TMS32OC25) is used to implement the sensorless algorithm that computes the rotor position and speed from the stator currents. Block diagrams of the DSP-based drive system and the control configuration are shown in Fig. 15. The phase currents are provided by current sensors and 12-bit AD converters. The phase voltage, required by the sensorless algorithm, is computed using the dc link voltage, PWM pattem, and dead time information to eliminate the noise-sensitive ac voltage detector