Recent content by rsk2mc

  1. rsk2mc

    PCB Heat Transfer Problem

    It is not depresserized. It is a form of shielding. The reason I posted this is because my initial calcs are off by 80 degrees and I'm not sure what I'm missing. I am on the process of running an Ansys analysis but I was hoping to solve this by hand. We have tested this which is how I know the...
  2. rsk2mc

    PCB Heat Transfer Problem

    No, the pcb is set inside the copper enclosure. The heat is mainly caused by rf and stray currents.
  3. rsk2mc

    PCB Heat Transfer Problem

    No, it's all enclosed.
  4. rsk2mc

    PCB Heat Transfer Problem

    There is air space between the pcb and the inner copper box.
  5. rsk2mc

    PCB Heat Transfer Problem

    The material is ULTEM and the pcb is FR4.
  6. rsk2mc

    PCB Heat Transfer Problem

    This design was actually made by Electrical Engineers, then the obvious problems occurred, MEs were brought in.
  7. rsk2mc

    PCB Heat Transfer Problem

    The above info is what was given to me, I did not derive these numbers. I have been away from heat transfer for quite a while, I'm more focused in stress analysis. This is in a controlled environment, this is a healthcare application.
  8. rsk2mc

    PCB Heat Transfer Problem

    Hello, I will try and provide as much detail to the problem as I can with the hope someone can help me solve this. We are currently working on a wireless project that contains high electrical currents, because of this the box the electronics are enclosed in experience quite a temperature rise...
  9. rsk2mc

    Automotive Torque and wheel size of a car

    Also your rpm changes. The circumference (pi*D) is less on the smaller diameter.
  10. rsk2mc

    Defining Moment: Understanding the Physical Significance of Moment in Physics

    The best way I understand it is to think of a torque. Torque is a force applied over a distance that causes twisting. When you think of moment think of torque, they essentially are the same thing.
  11. rsk2mc

    Torque and power of electric motor

    you have to convert velocity to angular velocity to when you are using a spinning shaft. Angular velocity is calculated by v = r × ω Where: v: Linear velocity, in m/s r: Radius, in meter ω: Angular velocity, in rad/s To do this in RPM you would use v = r × RPM × 0.10472 Where: v: Linear...
  12. rsk2mc

    How do I calculate pressure drop in a pipeline?

    Take a look at this link http://www.engineersedge.com/fluid_flow/pressure_drop/pressure_drop.htm
  13. rsk2mc

    Torque and power of electric motor

    Since velocity is a linear measure (distance of time) and you are spinning a shaft which is angular velocity you have to relate them by converting velocity to RPM. Hope this helps!
  14. rsk2mc

    Torque and power of electric motor

    I would double check this but in English units HP= torque * rpm ÷5252. So if you calculate the required torque, you know the HP of the motor you find rpm. So translate you required speed to rpm and I think you got it.
  15. rsk2mc

    Torque and power of electric motor

    To calculate the torque required its simply 1/2*D*L where D is the pulley diameter and L is the load.
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