The programming of the LCD 1602 mentioned last time was quite complicated. This time I said a simple one: stepping motor.
Do not say stepping motor's "subdivision" experiment, just talk about the basic concepts of the stepper motor and the three working methods of the stepper motor - single shot, double shot, single and double shot, and now the programming of the stepper motor Generally use a special stepper motor driver chip (such as: L6219 chip), so the specific programming will be discussed next time. Let us talk about phase, line and polarity first.
One: line, phase, polarity
"Phase" means that the stepper motor has several coils (also called windings).
"Line" means that the stepper motor has several connections.
"Polarity" is divided into unipolar and bipolar. If the coil of the stepper motor is bidirectionally conductive, the stepper motor is bipolar. Conversely, if the coil of the stepper motor is only conductive in one direction, the stepper motor is unipolar.
The above three can be deduced as long as you know two of them.
Such as:
The five-wire four-phase stepping motor has five wiring ports and four coils.
Since there are five wiring heads, that is, the number of wiring heads is an odd number, that is, one wiring head is a common connector, the conduction mode of its coil is only allowed to be one-way, that is, this stepping motor is single. Polar. As shown below:
The four-wire bipolar stepper motor has four wiring ports, and the conductive mode is bidirectional.
Because there are four wiring ports and the conductive mode is bi-directional, this stepper motor is two-phase.
Second, the stepper motor stepper: single shot, double shot, single and double shot
1, single shot: (single-shot work method)
The single-shot mode of operation means that only one coil is energized at a time, and the stepper motor is rotated by changing the coil for each energization.
First of all, said five-wire four-phase stepper motor, assuming that its four coils are called A, B, C, D, then in the single-shot mode of work, the coil energizing method is: A, B, C, D;
Then there is a four-wire bipolar stepper motor. Assuming its two coils are called A and B, then in single-shot mode, the coils are: A, B, -A, -B;
[Note] A, B refers to the A, B coil through the forward current, -A, -B refers to A, B coil through the reverse current. Since the five-wire, four-phase stepper motor cannot pass reverse current, only A, B, C, and D.
Of course, all the above are just theoretical, and we naturally have simple methods for memorizing words:
The following is a five-wire, four-phase stepper motor:
The following is a four-wire bipolar stepper motor:
2, double shot: (double four-shot work method)
The double-shot mode of operation is that each time two coils are energized, the stepper motor is rotated by changing the energized coil.
Five-phase four-phase stepping motor: In the double-shooting mode, the energizing mode of the coil is: AB, BC, CD, DA;
Four-wire bipolar stepper motor, in the double-shot mode of operation, the coil energizing mode is: AB, BA, -AB, -BA;
It is easy for everyone to find out the law.
3, single and double shot (eight-shot work method)
Single and double shots work in single-shot mode and double-tap mode.
Five-wire four-phase stepping motor: A, AB, B, BC, C, CD, D, DA;
Four-wire bipolar stepper motor: A, AB, B, BA, -A, -AB, -B, -BA;
As long as you control the map I painted above, you can easily remember.
Finally, talk about the step angle:
Step angle is generally used in advanced applications of stepper motors. Our beginners (I am also a beginner) generally do not need to consider, I just to explain a comprehensive number of plus step angle, we are interested can look at the above image.
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