Automation & Control
11/21/2011 8:11:11 PM
The method of using standard induction motors driven a bit faster than synchronous speed was quite interesting. I can understand needing to have some belts that could slip, as a means of allowing the motors to synchronise with the mains power, because otherwise it would not work. It is also probably the cheapest approach, although it may not be the most efficient. My choice would be to drive three phase alternators and then convert the power to the correct frequency using a switching cycloconverter. That is more costly, however. The advantages are that one single device could be controlled to deliver the desired amount of power, and the generator would not need to have the drive speed controlled so precisely. Besides that, I like alternators more.
One interesting thought is that one of the older mecanical meters could be driven backward quite simply, but the newer generation of smartmeters could easily be programmed to not run in reverse. In addition, It is certain that the power company could pull all kinds of tricks with the smartmeter programming.
One last comment is that it would be interesting to see a detailed description of both the mechanical and the electrical design of the system.
Jim, I agree. That’s mind-boggling. But here in California, for decades PG&E fought solar power in homes tooth and nail. A once-famous local columnist, Herb Caen, once famously said “PG&E wants to put a switch on the sun.” When PG&E finally had to give in, it then fought buy-back for many more years.
What part of free is so tough to get? I think it’s actually about control, not about free.
11/19/2011 8:11:30 PM
11/19/2011 8:03:18 PM
It looks like you took the time to research the highest efficiency in belt power transmission- are all your drives toothed belting? The video is not clear–the main drive from the turbine looked like it might be a multiple v-belt setup but the motor drives certainly looked like toothed belt drives. Do the toothed belt drives on the motors allow for automatic synchronization of all three motors with each other? Did you have to play with the shaft orientation on each motor to get all three sinewaves from the motors to coincide?
Congratulations on your efforts! You can be justifiably proud of your accomplishment. And I probably will investigate Automation Direct as well!