Stepper Motor with Double Output Shaft

Stepper motors, or rather motors in general, may be manufactured to have a shaft that extends out both ends of the unit. The greater majority of units sold though will have the shaft extending out one end only. The reason of this is simple - applicability to the needs of the end application. Ability to modify an existing motor to push the shaft out from one end to cause it to extend out both ends may be possible in some instances but it depends entirely on the construction and design of a particular motor. So there is not a specific answer to your question other than to purchase a unit you are interested in and try taking it apart and seeing what may be possible. In lieu of that you need to put on your shopping hat and start looking at manufacturer web sites and find a motor that has dual extended shaft ends that would meet your needs.

1. How can I get a stepper motor to engage with a freely spinning wheel?

You can use a SPRAG type clutch from Altramotion.com or a backstop that would spin the opposite direction which could act like a engagement gear. But i still believe you can get a all in one unit from them for a SPRAG clutch that will be useful for you.

2. Stepper Motor Voltage

Darlington pairs have very high saturation voltage. In this case if you refer to the datasheet for the TIP122 you will see that you might expect anything from 2-4V across the C-E. In your case the saturation voltage will be very high because you have minimal base current for the TIP122. A FET may be a better device to consider. Update: The base current you use is far too low. You have to overdrive the base to ensure the final transistor gets closer to saturation. Using the Fairchild datasheet for the TIP122 (there is an error in the OnSemi version) you get this graph. For Ib=Ic/250 you will need 4mA of base current (it's slightly more complicated than this because of the internal resistors). With a Vbe(sat) of around 1.5V you need an 875 Ohm base resistor driving from a 5V Arduino. This should give you a Vce(sat) of approximately 0.8V at 1A.

3. stepper motor doesn't work but get no error message

Here you can find the manual of your stepper driver.Look at page in the section "CN3 (I/O signals)". Beside the pulse and directions, that you already set in your code, there are 2 more input signals defined: AWO will turn off the motor completely, if you provide a signal, CS changes the source of the step angle setting. As you do not configure any pins, other than pulse and direction, the other pins on the Arduino are set as input/high impedance. The state of these pins can float wildly depending on what noise is comming by. I do not know, if this really matters for this driver, but you should try to provide a valid state on all the input pins of the driver. For example a floating AWO pin might randomly disable and enable your motor very fast (which would at least fit with the described behavior). Set the corresponding pin on the Arduino as output (via pinMode()) and give them the state, that you want via digitalWrite() (I suggest LOW for AWO to enable the motors and HIGH for CS to get the basic step angle).I cannot see on your images, if everything is connected to the driver, as it should (here a wiring diagram or a schematic would help). For now I assume, that the signal pins on the Arduino side are connected correctly.The input signals of the driver are meant to be provided by a pair of twisted wires. This is done to minimize noise on the line. Thus all input signals have 2 pins: "" and "-". Connect all "-" pins to ground and the "" pins to the appropriate digital output pin on the Arduino.If a have a oscilloscope or a logic analyzer, you can also monitor the ALM and TIM outputs of the driver. Maybe they are showing, what is going wrong.Let us know, if this helps

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In addition to Zebonaut's post, we have also seen more esoteric behaviour driving steppers:1. Will the Stepper Motor 17HS3401 work fine with the TMC2130 driver? Or is the driver chip going to burn? Are they compatible?Higher operating voltages translate to higher stepping rates (and higher peak RPM, higher torque at higher RPMs). If you operate the motor from 3.12V, you will get the rated torque at 0 RPM (aka holding force), but performance at any speed will be poor. Since the TMC2130 driver is a constant current PWM driver, higher voltages (up to the rated voltage of the TMS2130 and any filter caps/etc) will produce better motor performance. The TMS2130 chip may get hotter (due to the internal LDO to drive internal circuitry).For most applications you will be fine with 12V.Additional simplified explanation: The higher voltages are needed to quickly change the current flow in the motor coils.2. Which stepper motor should be enough to move a water valve and for the TMC2130 driver?This is not how you make a simple hydraulic linear fluid valve, but one that is precision controlled to your specs.In order to make it linear, you need to know the torque transfer function might not be position-dependent with ageing on the valve or water pressure. But you do need to control torque with a motor. The best way is to use current to control the motor torque limit, but you need to define position, velocity and acceleration as ther emay be some backlash. You can attempt to measure it and then do the same for your stepper motors vs voltage or current limit then define a,v,x transfer functions. To allow cogging with low torque limit, recal is needed to home position. Full Steps can be used.3. What is "idle current reduction" used for on a CNC stepper motor driver?They will reduce the power to the steppers after they have been idled for a set period of time.. This will decrease heat and increase the life of the system. Depending on what you are doing you would not use this feature. If you plan on leaving your machine on long periods of time it would be good option. Most hobbyist turn their machines off when they are done running. It would be better going with gecko controller if you have the money.4. Conserving battery life in a stepper motor circuitYou may be a little confused.The intent of connecting the enables to the micro is so you can turn off the motors when you are not repositioning. That is, the motors should hold position by means of the detent torque of the motors themselves and consume no power while stationary.That of course assumes the motors will hold position when unpowered. The mechanism should be balanced appropriately to allow for that.In order to do that you would really need independent control over both motors. The up down motor only needing to be powered briefly at the end of each horizontal scan. As such, you would need two IO pins for enables and four pins for the winding control pins. (Though since you are only running one motor at a time, you can get away with two pins for this.)simulate this circuit - Schematic created using CircuitLabHOWEVER: A bigger issues you will face is the 293 is not suitable for running things at 5V. The device can not drive close enough to the rails to provide your required drive voltage. See this cross-post5. How to run stepper motor at its maximum speedThe speed of the stepper motor (assuming you measure it in RPM) will depend on many factors. I am not sure how the "30 step size at 7V" you mention is relevant.IMHO, the most important parameters are1) physical parameters of motor (steps per revolution, rated voltage, motor intetia)2) Load on the motor3) software implementationNormally you should not be able to affect 1( if you are looking like most arduino's developers you should be looking at things like this. i.e. 200 steps per revolution, 5-12VDC and a few tens to hundreds of g*cm^2 or motor inertia.) or 2 (although with higher loads lower velocities can be achieved, normally you select the motor based on the load and not vice versa).Therefore you are left with Software implementation. Things here can get messy very quickly depending on how experienced you are and what you want to do. e.g. The arduino Stepper library is simple and you can set parameters but it is blocking (i.e. you can not do anything else until movement is completed, or interrupts are used). If you want to get your hands dirty (and your head messed up ;-/ ) you can looks at My experience is that normally you can get up to 150 [rpm] easily. Theoretically you should be able to go higher but the uC should be doing pretty much nothing else.
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