> > I have seen and run machinekit, it is linuxcnc. I have also read about > > BeagleBone. There are plenty of devices suitable to generate the > > pulses but at which rate should pulses generated? Constant > > acceleration between different speeds? > > Ideally, the accel (and decel) should be t=rc curve or close, because at > the higher speeds, the motors torque is falling like a rock so the accel > ability is less and less as it speeds up. On slowdown the curve should > be reversed left for right because the motors torque is increasing as it > slows, so you can slow it even faster.
I think constant torque then if in flux weaking region constant power is an appropriate model for the motor. > But I believe the huge majority of our controllers use pretty close to a > straight line ramp going either direction. If thats not the case, > someone please correct me. Yes straight line: maximum velocity and maximum acceleration. > Which said another way, speed vs acceleration is a tradeoff. I can > usually double the rapids achieved, but its at the cost of slower > acceleration, ... If in flux weakening region I Agree. I however think most drives are used in constant torque region and then current model is accurate. I however think most electrical motors are possible to overload for a short while. Then is the complexity for not simle kinematics. Nicklas Karlsson ------------------------------------------------------------------------------ Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://pubads.g.doubleclick.net/gampad/clk?id=278785231&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
