Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations waross on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  • Users: derekpulis
  • Content: Threads
  • Order by date
  1. derekpulis

    need help selecting a motor and drive

    I have a product with a manual wheel for height adjustment. My customer wants this to be motorized. My existing product has a wheel to adjust my load. The current speed is manual ~ 60rpm. The torque is 1.6Nm (see attached). The motorized speed should be about 60 – 600 rpm (this is...
  2. derekpulis

    Motor Selection / Requirement

    I am an EE with Power Supply Design and 3 phase AC Induction Design experience. I have a new project that requires rotating a 4 pound load at speeds of 10 – 2000 RPMs via direct drive (no gears). There will be a slow start ramp of a TBD rate. I also need to control the direction. I think a PM-DC...
  3. derekpulis

    Batt Back AC or DC Motor?

    I have designed a 1HP VFD. I now need battery backup motor control for the same power range. I also have a solar requirement which keeps the battery voltage at 12V (24V solar is an option but less popular). I have two options: 1. 'Step-up' the battery voltage to the VFD DC voltage through an...
  4. derekpulis

    Designing a VFD for 1HP induction motor.

    I have been tasked with designing a variable speed drive for an induction motor. What is the required (recommended) ripple for the DC voltage? This will determine my capacitor. What happens if I operate with more ripple? I understand I need to maintain constant air-gap flux with constant...

Part and Inventory Search