Hybrid Stepper Motor Angular Displacement Measurement In Applied Research

As an electromechanical element, which can transform digital electrical pulse signal into mechanical angle displacement, the stepper motor takes the advantage that it can work well in the open loop system, and is widely used in different kinds of control system. In the control system, the rotor position of stepper motor is usually obtained by position sensor. The shortcoming of the position sensor usually used is that it increases the volume of the motor, increases the cost, and decreases the reliability of the systems operation. So it has momentous theoretical and practical significance for the research about the stepper motor in the control system to find an easier and more economic transducer to obtain the rotor position.Based on the background, this paper proposes a novel method of combining the position senor with the drive motor. It's an innovation for the control system, especially for the teaching system.In this paper, the study for the two-phase hybrid stepper motor as a position sensor is investigated. The main results of this paper are as follows:In chapter 1, the feasibility of stepper motor as a position sensor is discussed. In hybrid stepper motor, the back EMF of stator winding is function of rotor position, continuous rotor position is obtained from thefunction. Simultaneously, rotor speed can be calculated indirectly by using the position signals.In chapter 2, the mathematical model of two-phase hybrid stepper motor as a generator is established. Then according to the model, the functional relationship is obtained between the terminal voltage of stator winding and continuous rotor position. It establishes the foundation for the continuous rotor position detection.In chapter 3, according to the model, two-phase hybrid stepper motor as a position sensor is designed. It is implemented in an environment composed of MATLAB, SIMULINK and Real-Time workshop.In chapter 4, the designed position sensor is experimentally tested. Compared the result of position detection of the sensor with the stepper motor's actual trajectory, we get satisfactory result. It proves the feasibility of the method.Chapter 5 is the summarization and prospect.