Hey thanks for suggesting, I would prefer a higher frequency/rpm than a higher torque. The mass of the airfoil is very less, and looking at the graph in post#3 lower Torque values can give you a higher rpm and freq. Is that something servo can do?While it may sound 'fancy' to use a Stepper Motor, I strongly suggest for your application you should instead use a Servo Motor. They are much easier to control, have a much higher torque in a smaller package, and are actually designed for applications such as yours.
What you say makes sense Brian. What would you suggest for this application then, I have calculated the torque on the motor to be 57 +/- 5 Newton.cm.The bigger the motor the more mass you have to shift to move it. Adding the airfoil makes the problem harder, especially as the air flow will require additional power to deflect it.
Also be careful with specifications, when some stepper motors are described as RPM they really mean steps per minute and depending on the step angle, you may need several steps to achieve the 10 degree movement. The motor you show has a 1.8 degree step so at least six steps are needed to reach 10 degree rotation and this obviously limits the top speed.
The other consideration is the controller, the pulse speed is probably a technical rather than practical specification. To drive full load and full speed simultaneously may not be possible and bear in mind that some manufacturers 'stretch' the specification to the limit to make their products sound more appealing!
Brian.
The airfoil is a 3d printed piece weighing 10 grams supported on a metal rod weighing 10 grams. The current setup is controlled using a stepper motor controller. Everything works perfectly fine but I'm able to get only a max Hertz of 3 for my max flow rate with an estimated torque req for this being 60Ncm. We are trying to attain a oscillating frequency of 50-100Hz. Is this possible using any motor available in the market.This isn't my field of expertise and you haven't given any size of the airfoil to help visualize it. Using the calculation you made, any motor exceeding 62 Newton/cm torque and having a stepping speed of at least 10mS should suffice. For driving it, the cheapest option would be to use one of the many pre-built stepper driver boards sold for building 3D printers and some simple pulse generating software.
If I may make a suggestion, and I'm not sure if it is applicable, have you considered a reciprocating mechanism and standard motor or maybe using a gearing system to convert a wider stepping angle to 10 degrees you need. Both methods might reduce the input power needed without sacrificing speed.
Brian.
First time we're reading about 50-100Hz oscillation requirement. Incidentally 1000rpm translates to 16.67rps which translates to max 300 oscillations of 10deg width per second capability.The airfoil is a 3d printed piece weighing 10 grams supported on a metal rod weighing 10 grams. The current setup is controlled using a stepper motor controller. Everything works perfectly fine but I'm able to get only a max Hertz of 3 for my max flow rate with an estimated torque req for this being 60Ncm. We are trying to attain a oscillating frequency of 50-100Hz. Is this possible using any motor available in the market.
300 oscillations/s is more than needed.First time we're reading about 50-100Hz oscillation requirement. Incidentally 1000rpm translates to 16.67rps which translates to max 300 oscillations of 10deg width per second capability.
Higher frequency requiremes higher torque to move the intertia.Hey thanks for suggesting, I would prefer a higher frequency/rpm than a higher torque. The mass of the airfoil is very less,
This is an excellent idea. OP should take note and let us know why he can't do this.If I may make a suggestion, and I'm not sure if it is applicable, have you considered a reciprocating mechanism and standard motor or maybe using a gearing system to convert a wider stepping angle to 10 degrees you need. Both methods might reduce the input power needed without sacrificing speed.
Brian.
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