Peter C. Wallace wrote: > > The Fanuc digital drives are relatively simple power stages that need a 3 > phase current controller that implements field oriented control. Not really trying to sell you stuff, but I do have some gear that should be able to drive these motors, now. The motors, actually, should be easy, as long as they are the ~150 V variety, not the 250 V ones. The problem is the proprietary Fanuc encoders. I don't have exact cross references to your specific motors, but the B731 looks like a 2000P ABS encoder, of the older scheme. These provided industry-compatible ABZ quadrature, but the commutation signals were proprietary. I have a converter that provides rough commutation for the first turn after power-up, and then counts quadrature from the index pulse to give the most accurate commutation signals. I also have a PWM drive for brushless motors, and a PWM controller. This is a simple system, and uses "six step" drive, sometimes called trapezoidal commutation, and is not as smooth as a sinusoidal drive scheme, but it is a lot simpler.
Can you get me the motor and encoder nameplates? I'll try to verify the compatibility of them with my gear. (I also have converters for the newer Fanuc serial pulsecoders, if in fact that is what is fitted to the robot.) Some other options are Copley servo amps that take two sinusoidal torque command signals, or AMC or Servo Dynamics amps. Jon ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60135991&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
