Using the DR-2112: http://www.lorenz-messtechnik.de/english/products/torque_rotating_contactless.php
we measure it directly. Mechanical energy generated per cycle is simply T Nm x 2 pi radians = Joules output. Electrical energy is measured using a digital scope to generate CSV files for V & I vs T at 10k samples per sec. We calculate power using Excel to integrate and multiply. Multiply times the time the pulse is on per cycle to get Joules (Watt-seconds) input. We have a 2 Nm version and a 100 Nm version of the Torque Sensor. Really nice piece of work it is. We have verified these measurements using DeProny brakes and also by lifting weights. Lifting weights is a really kewl way of measuring mechanical energy. We used a bucket with sand so that we could precisely choose the amount of mass. <g> Terry On Fri, Jun 26, 2009 at 1:19 PM, Jed Rothwell<jedrothw...@gmail.com> wrote: > Terry Blanton wrote: > >> We built and tested the bicycle wheel pulsed motor using four NdFeBo >> magnets on the wheel and a single stationary coil. I wanted to do >> this since I had never seen anyone actually measure the torque of a >> Bedini motor. . . . The best COP we were able to obtain was about 0.24. > > How did you measure torque -- or mechanical energy I assume. The only way to > measure torque I know is to stop the machine, which would affect its > performance obviously. > > I assume this means for 1 W of input it produced 0.24 W of mechanical > energy, ignoring losses to friction, resistance electrical heating and so > on. If it was an extraordinarily inefficient motor it might conceivably be > over-unity anyway, with the rest coming out as waste heat. You could only > tell by stuffing it into a calorimeter. > > That situation would be somewhat similar to the older models of Roger > Stringham's ultrasound gadgets. They had a large, complex power supply > outside the calorimeter, which supposedly delivered a certain amount of > power to the device inside the calorimeter. It would be over unity if actual > delivered power is estimated correctly, or not if it isn't. The later models > had miniature power supplies that fit into the calorimeter. I do not know if > they ever produced convincing excess heat. Back when Gene Mallove was trying > to replicate this device I was unimpressed with Stringham's calorimetry. I > have not looked closely at it since then. > > - Jed > >
