Stepper jumping back and forth
I've been trying to get the stepper motor to work, but I can't seem to get the leads in So far, all they do is rock back and forth really quickly. .. winding phase relationships result in which positions, but generally, with surplus. (which is all handled by arduino) The best way is to provide him a visual I suggest you check some tutorials on how stepper motors work, and. Hi I am trying to get a TBAHQ board working with EMC After a long Need Help!- stepper motors oscillate back and forth when unloaded.
Also, about the low power problem. I don't think that that is the problem because I have gotten the same stepper to work straight into the Arduino before I had the motor shield. It worked slowly and was weak, but it still spun. Just for a second, let's assume that your problem isn't power related.
Stepper motor not rotating, just sounds like it is going back and fourth
It still could be, but for convenience, we'll assume it isn't. We'll get to that later. Ok, so you got the motor to work, albeit weakly, when directly connected to Arduino port pins. Well, good in that the motor works. Not good in that it probably exceeds the 20ma current rating of the pins and could have burned them out.
You may have gotten lucky AVR chips have a rep for being tough little beastiesbut it could happen. And then there's the issue of the big inductive spike that feeds back on the line when the motor winding gets turned off, unless you wired in some protection diodes. You're not using the same code to run the motor shield that you did with your successful direct driving experiment, are you?
The code that successfully ran the motor from Arduino pins isn't going to work directly with the motor shield.
The electrical interface is very different, logically. I don't have an Arduino or a motor shield. I'm getting that from the schematic. Assuming you are using the motor shield API calls, set the duty cycle motor. Now I know where the leads go to on the actual device, where to they go on the Motor shield? The code is exactly the same.
I know mine is bipolar, but I don't have enough experience with stepper motors to know what is what. Connect one coil to M1 and the other to M2. Or connect one coil to M3 and the other to M4. Thanks for your help, but it still doesn't spin correctly. Should I try another stepper? Do you really think that power is the problem? There are several different kinds of power problems. One kind simply provides insufficient power to the motor.
When testing a stepper motor always be sure to add a load. The other two graphs show the motor with a load. Loading a motor properly will smooth out its performance.
For shorter, quicker moves, the ratio should be closer to 1: The motor will exhibit much wilder vibrations when the input pulse frequency matches the natural frequency of the motor.
This is called resonance and usually occurs around Hz. In resonance, the overshooting and undershooting become much greater and the chance of missing steps is much higher. The resonance changes depending on the load inertia, but it is usually around Hz. If you are missing steps in multiples of four, the vibration is causing a loss of synchronism, or the load is too great. If the missed steps are not a multiple of four, there's a good chance the wrong number of pulses or electrical noise is causing the problems.
There are a number of ways to get around resonance. The easiest way is to avoid that speed altogether. Most motors have a maximum starting speed around pps or so. So in most cases you can start the motor at a higher speed than the resonant speed. If you have to start at a speed below the resonant speed, accelerate through the resonant range quickly. Another solution is to make the step angle smaller. The motor will always overshoot and undershoot more for bigger step angles.
If the motor doesn't have to travel far, it will not build up enough force torque to overshoot a large amount. Anytime the step angle is made smaller, the motor will not vibrate as much.
This is why half-stepping and microstepping systems are so effective at reducing vibration. Make sure the motor is sized properly to the load.
By choosing the proper motor you can improve performance. Dampers are also available. Dampers fit on the back shaft of a motor and absorb some of the vibrational energy. They'll often smooth out a vibrating motor inexpensively. The most obvious difference between 2-phase and 5-phase see interactive diagram below is the number of stator poles.
While 2-phase motors have 8 poles, 4 per phase, the 5-phase motor has 10 poles, 2 per phase. The rotor is the same as that of a 2-phase motor.
Since the pitch is still 7. Simply based on construction, the resolution of the 5-phase has steps per revolution versus the 2-phase with steps per revolution. The 5-phase offers a resolution 2. With a higher resolution you get a smaller step angle, which in turn reduces vibration.
Since the step angle of the 5-phase is 2. In both 2-phase and 5-phase, the rotor must overshoot or undershoot more than 3.Steppermotor going back and forth.
Because the step angle of the 5-phase is only 0. The chances of losing synchronism with a 5-phase stepper motor are very low.
Drive Methods There are four different drive methods for stepper motors: In the wave drive method also called the 1-phase ON methodonly one phase is turned on at a time. When we energize the A phase a a south pole, it attracts the north pole of the rotor. Each time only one phase is energized. The wave drive has a four step electrical sequence to rotate the motor.
If both phases A and B are energized as south poles, the north pole of the rotor will be equally attracted to both poles and line up directly in the middle. In sequence as the phases are energized, the rotor will rotate to line up between the two energized poles. The "2 phase on" method has a four step electrical sequence to rotate the motor.
Adafruit customer service forums • View topic - Stepper motor leads
What advantage does the "2 phase on" method have over the "1 phase on" method? The answer is torque. In the "1 phase on" method, only one phase is turned on at a time, so we have one unit of torque acting on the rotor.
In the "2 phase on" method, we have two units of torque acting on the rotor, 1 at the 12 o'clock position and 1 at the 3 o'clock position. Five phase motors are a bit different. Rather than using the "two phase on" method, we use the "four phase on" method. Each time we turn on 4 of the phases and the motor takes a step.