- #1
Ken Lavis
- 4
- 0
I'm currently working on a senior project that consists of a frequency controlled AC motor that statically converts 120vac out of the wall to 220vac three phase required for the motor. It is a 1/3 HP, 208vac, 2.4A, 1.35SF, 1720 RPM motor. The frequency driver says it is capable for 2.6A 208vac 3 phase output. The issue i am having, is when i run the motor at approximately 45Hz of it's maximum 60Hz, it will reach it's current of 2.4A under no load. Of all things I find, I should be able to run the motor at full speed at anywhere from 66%-80% of it's rated horsepower.
The motor will be mechanically coupled to a DC generator to simply power a 12v DC fan. If I keep it on an electrical load to demonstrate the output say desired for a given application, I can alter the electrical load to simulate say a device that will draw 10mA or 2A.
The frequency driver I have is a reliance, yet it is an older model (don't have the model numbers on me at this time). If anyone can give me some insight into static phase conversions and why I cannot run the motor at max speed without the motor running at maximum overload capacity. (Measured leg current = 3.2A: 2.4A (Rated) * 1.35 (SF) = 3.24A)
The motor will be mechanically coupled to a DC generator to simply power a 12v DC fan. If I keep it on an electrical load to demonstrate the output say desired for a given application, I can alter the electrical load to simulate say a device that will draw 10mA or 2A.
The frequency driver I have is a reliance, yet it is an older model (don't have the model numbers on me at this time). If anyone can give me some insight into static phase conversions and why I cannot run the motor at max speed without the motor running at maximum overload capacity. (Measured leg current = 3.2A: 2.4A (Rated) * 1.35 (SF) = 3.24A)