![]() ![]() 8.2 Unipolar 4-Phase (or bipolar 2 phase) stepper motor having six terminals To make the motor shaft turn, first one electromagnet is given power, which makes the gear's teeth magnetically attracted to the electromagnet's teeth. 8.1 Toothed stepper motor and state of motion at different coil excitation. Stepper motors, on the other hand, effectively have multiple "toothed" electromagnets arranged around a central metal gear, as shown in Fig Fig. In general, there are three types of stepping motor: VR (Variable Reluctance) stepping motors Hybrid stepping motors PM (Permanent Magnet) stepping motors 8.4 Theory of operation Stepper motors operate differently from normal DC motors, which simply spin when voltage is applied to their terminals. Stepping motors are suitable for translating digital inputs into mechanical motion. ![]() ![]() Using microcomputer, one can have better control of the angular displacement resolution and angular speed of a stepping motor. By using suitable control circuitry, the angular displacement can be made proportional to the number of pulses. 1 8 I/O Device Interface to 8086 Microprocessor Stepping Motor Control and FND Display 8.1 Objective The objectives of this experiment are Familiarization with a programmable peripheral interface device, 8255 Use of 8255 PPI for controlling external devices Controlling a stepper motor through peripheral devices connected to 8086 microprocessor Controlling a seven segment LED display unit 8.2 Learning Outcome At the end of the experiment the students will be enable to Configure 8255 PPI for controlling its I/O ports Learn how to write assembly program related to accessing I/O devices and control of actuators Control a stepper motor in various modes using a microprocessor trainer Interface seven segment LED display 8.3 Introduction The stepping motor is a device which can transfer the incoming pulses to stepping motion of a predetermined angular displacement. ![]()
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