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stepper motor interface with 8051 microcontroller, Lecture notes of Microprocessors

Acharya Nagarjuna UniversityMicroprocessors

it explains how the stepper motor is interfaced with 8051 microcontroller and describes about its working and direction control

Typology: Lecture notes

2017/2018

Uploaded on 11/15/2018

kinnera
kinnera 🇮🇳

2 documents

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Stepper motor
•Stepper motor is a widely used device that translates
electrical pulses in to mechanical movement.
•In applications such as robotics stepper motor is
used for position control.
•Stepper motor is brushless DC motor, which can be
rotated in small angles, these angles are called steps.
Generally stepper motor use 200 steps to complete
360 degree rotation, means its rotate 1.8 degree per
step.
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Stepper motor

  • (^) Stepper motor is a widely used device that translates electrical pulses in to mechanical movement.
  • (^) In applications such as robotics stepper motor is used for position control.
  • (^) Stepper motor is brushless DC motor, which can be rotated in small angles, these angles are called steps. Generally stepper motor use 200 steps to complete 360 degree rotation, means its rotate 1.8 degree per step.
  • (^) Stepper motor is made up of a stator and a rotor. Stator represents the four electromagnet coils which remain stationary around the rotor, and rotor represents permanent magnet which rotates. Whenever the coils energised by applying the current, the electromagnetic field is created, resulting the rotation of rotator (permanent magnet).
  • (^) Wave drive mode : In this mode one coil is energised at a time, all four coil are energised one after another. It produces less torque in compare with Full step drive mode but power consumption is less. Following is the table for producing this mode using microcontroller, means we need to give Logic 1 to the coils in the sequential manner.
  • (^) Full Drive mode: In this, two coil are energised at the same time producing high torque. Power consumption is higher. We need to give Logic 1 to two coils at the same time, then to the next two coils and so on.
  • (^) Half Drive mode: In this mode one and two coils are energised alternatively, means firstly one coil is energised then two coils are energised then again one coil is energised then again two, and so on. This is combination of full and wave drive mode, and used to increase the angular rotation of the motor.

Single-Coil Excitation Two-Coil Excitation Interleaved Single- and Two-Coil Excitation Half-Stepping