So, you are adjusting the stepper motor current, but indirectly.
AMP STEPS MOTOR DRIVER
This tells the driver what its output current should be. What you are actually adjusting is the vref input voltage to the stepper motor driver. While it is called stepper current what is really measured is the voltage that the driver itself is putting out.
AMP STEPS MOTOR DRIVERS
It does not matter if it is an all in one board straight from the factory or an Arduino mega and a Ramps 1.4 board, with individual drivers on a complete custom build, you at least should be checking the driver’s current. This is an ever important part of the last stage of any 3D printer build. It is the stepper driver current adjustment. This time I have decided to write about what I consider be a very import part of the 3d printer building stage, but can also be applied to in other it places. I will simply be writing how I do things right or wrong, it works for me and I hope it will work for you as well. I tend to write the way I think and speak in my everyday life I am straight forward and NONE of that “you must do things this way”……. They will cover whatever comes to mind at the time that I sit down to write. These articles will not be published in any order.
Over the past few months I have started to see more and more questions about setting up and also tuning various 3D printers and their options. I have two CNC mills as well as a CNC lathe and two 3D printers, which is what brought me here. I also have an electrical and computer numeric controlled (CNC) background. My Name is Scott I’m 38 married with four kids, and an Air Force Veteran, I have my associates and bachelor degrees. Its value is first decreased and then increased which in turn first increases and then decreases speed of the stepper motor.Well Seeing as How I’m new to writing articles like this and this is the first one I have had published anywhere I am going to take a second to introduce myself a little. Here you can clearly see how speed of the motor varies with resistance R2. Thus value of potentiometer determines speed of the stepper motor. Thus when R2 or pot’s value is maximum, frequency is minimum due to which IC 4017 counts more slowly and gives more delayed output.Īs value of resistance R2 decreases, frequency increases which causes minimum delay between outputs of IC 4017. It is clear from the formula that frequency of clock pulses decreases as value of R2 increases. Formula for frequency of output clock pulse is : Let’s say initially position of pot is such that there is maximum resistance (220k) between discharge and threshold pin. Thus one complete revolution is obtained. Then same thing happens with Q2 which energizes coil 2 followed by coil 3 and coil 4. This energizes coil 1 and motor rotates at some angle which depends on clock frequency. When Q1 is on it acts like a closed switch and current flows through common wire to wire 1 and then to ground through transistor Q1. But when one transistor is on all other remain off. Since transistor Q1 is connected to pin 3, it switches on first then transistor Q2 followed by Q3 and Q4. These clock pulses are given to IC CD 4017 which then counts the clock pulses one by one and give 1 as output to pin no 3,2,4,7 respectively and repeats this process continuously. If you change value of any of these three component frequency of clock pulse will change. 555 timer produces clock pulses depending on the values of resistor, potentiometer and capacitor. WORKING:Īfter making connections properly if you switch on the circuit motor will start rotating in steps. This ensures no interruption in the motor’s rotation. 10 is connected to pin15 so that after 4rth count IC resets and counting starts from the beginning again. As we require only first four pins for one complete revolution of motor or first four decimal counts from o to 3, pin no. This causes certain delay in rotation of motor which is unnecessary.
AMP STEPS MOTOR FULL
Connect other wires of stepper motor in such a way so that coils are energized one by one to complete one full revolution properly.( you can look into datasheet of the motor provided by the manufacturer) WHY OUTPUT PIN 10 OF IC 4017 IS CONNECTED TO ITS PIN 15 (RESET PIN)?Īs already mentioned above 4017 counts clock pulses one by one up to 10th clock pulse and gives high output on output pins accordingly, each output pin goes high. Connect common wire of stepper motor to the positive of supply.Ħ. Connect 10 and 15th pin to ground through a 1k resistor.ĥ. Connect pins 3,2,4,7 one by one to transistors 1,2,3,4 respectively.Ĥ.
Connect enable pin or 13th pin of 4017 to ground.ģ. Connect pin 3 or output pin of 555 timer to pin 14 (clock pin ) of IC 4017.Ģ. Transistors enable high current to pass through them and then motor, thus excluding 555 timer completely as it can supply very little amount of current. Transistors act like switches here, thus energizing one coil at a time.Ģ.
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