Measuring the Rotation Angle of Stepper Motor [closed]

Yes, just keep track of the number of steps you have given the stepper driver. Usually a counter is used in the program. On power-up you would rotate the arm until a 'home' switch is made, zero your counter and then keep track from then on. It's a very simple and economical method and is used in thousands of applications including, for example, dot-matrix and inkjet printers.Stepper control is generally 'open loop'. This means that if the arm in your application gets blocked or stalled the program position counter will not know and will be out of sync with the real position.Step angle will be determined by your motor and whether you are using full-step, half-step or some micro-step mode.

1. How do you minimize stepper motor vibration?

Using full step driving, the rotor acts much like a Spring-Mass-System, with the rotor being the mass and the magnetic force being the spring. When you move from one step to the next, the motion will always be rough. The rotor pretty much jumps from one step to the next and it takes some time until the spring dampens out the rotor's energy, causing a little oscillation (read: rough motion). You can smooth this when you use half-step mode, and you can additionally compensate the torque-nonlinearity, cf. this linkFollowing this logic, you eventually end up using fine-Stepping, micro-stepping and sinusoidal driving. (See this link for micro-stepping)Some more details:The resonant frequency of a stepper motor's rotor is usually somewhere around 50 Hz . .. 400 Hz. When you drive the motor in full-step mode at its own mechanical resonant frequency, things will get pretty bad and it is likely that you lose (jump over) steps. For slow speeds, it is a good idea to stay below the motor's resonant frequency. For high speeds, try to get beyond the resoncance as fast as you can while accelerating, and do not use full-step driving.

2. Can I apply 12V intermittently to a 5V 28BYJ stepper motor?

As the title suggests, am I able to apply 12V to each winding of the 28BYJ (5V version) to increase the torque?That depends if you mean the ultimate torque or the torque at speed. When a stepper motor is being rapidly switched, the back EMF of switching the windings means that rated supply voltage can not immediately achieve rated current, and if the dwell time on each step is short enough that full current is never achieved, torque will fall off. This can be combatted by using a supply voltage several times the rating with a chopping current control. But the duration of application of full voltage will be quite short, and only as long as needed to achieve rated current.I understand that it's not ideal as it will overheat, but it wo not be running non-stop. It will run on average 2 seconds out of every 12, which I figure will cool down a bit between rotations. 2 seconds is probably too long. The concern is not only thermal but also that some types of magnets that have been used in such motors can be damaged by excessive fields produced by excessive currents.What you can do is:1) Source a motor suited to the mechanical need2) Use a chopping current driver with a supply voltage a few times the rated coil voltage to make sure full current is achieved, and set the current appropriately3) Optionally have two current setpoints - one for actual movement, and another (possibly zero, ie, motor off) to back off to under software control when full torque is not required. This is not unlike your original idea, the difference is that you really should not be running a motor at more than twice its rated current, unless you have an actual spec or informed evaluation that such current is acceptable for brief durations.

3. Can I use external stepper motor power and USB connection

The motors are powered from 12/24V external power supply, so the motors will not be powered. the ramps Schematics shows the connection diagram and the power is provided via the VMot pin/12V.

4. Can't make my stepper motor run clockwise and counterclockwise with AccelStepper Library

The "Performance" paragraph of the "Detailed Description" section of AccelStepper documentation says:The fastest motor speed that can be reliably supported is about 4000 steps per second at a clock frequency of 16 MHz on Arduino such as Uno etc. ...and the AccelStepper::setSpeed () documentation says:... Speeds of more than 1000 steps per second are unreliableTry changing your 6400-steps-per-second setting to a some plausible number, eg 500 or 1000. Actually, it would make sense to start out with moderate destination settings and speeds, like a target position of 200 instead of 16000, and steps-per-second of 100, or whatever count it takes for say exactly two shaft revolutions. Once you have that working right, then start doubling numbers until it no longer works, after which you can back off by a factor of say four (to allow for variations in load, etc)

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