A common stepper motor is the four-coil unipolar. They are called unipolar because they require only that their coils be driven on and off. The stepping sequence for a four-coil unipolar steppers is shown on table 4 below.
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| Stepping sequence for a four‐coil unipolar steppers |
The motor’s speed depends on how fast the controller runs through the step sequence. The stepper motor I have used is the 17PM-J319-02OST from Minebea-Matsushita. It requires a supply voltage of 12V and the coil current is 0.31A. Each step is 1.8 degrees.
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| Block diagram |
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| Front panel |
Title : Labview Based Solar Tracking System with Stepped Motor
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