rob43
Aerospace
- Jan 5, 2007
- 8
Have been testing rotor designs on a small prototype wind rig in a small wind tunnel using a 24V DC PM motor loaded with a variable resistive load as a generator. Results we have been getting seem out of whack with load characteristics.
Load is set at 12V 10A which given our small rotor size should be max power we are able to produce. Have hooked the load in series and used datalogging multimeters and anemometers to record "wind" velocity and amp and volt output.
everything seems fine until we approach 15 m/s. Over that speed the voltage and amperage start rising above 12V 10A. At 20m/s output on meters reads 24V 20A.
Have approximated rpms at 20m/s using a bootleg genset at about 15,000 rpm's. Around 7,000 rpms on genset gave us the load 12V 10A output.
We must be doing something wrong. Can anyone take a shot at what might be going on?
Load is set at 12V 10A which given our small rotor size should be max power we are able to produce. Have hooked the load in series and used datalogging multimeters and anemometers to record "wind" velocity and amp and volt output.
everything seems fine until we approach 15 m/s. Over that speed the voltage and amperage start rising above 12V 10A. At 20m/s output on meters reads 24V 20A.
Have approximated rpms at 20m/s using a bootleg genset at about 15,000 rpm's. Around 7,000 rpms on genset gave us the load 12V 10A output.
We must be doing something wrong. Can anyone take a shot at what might be going on?