TB6560 Stepper Motor Driver Boards

  
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Attached are 3 captures from my L297/L298 board using the same motor at 500, 750 and 900 steps/sec on a 36v supply, wired bipolar parallel (coil resistance = 3. 2ohm). This shows the A-enable signal (blue) and the sense voltage (red). The sense voltage is directly proportional to the current in the coil (x 2), so. 5v = 1A. At 500stesp/sec the RMS v
TB6560 Stepper Motor Driver Boards - schematic

oltage is 0. 64v, a current of 1. 3A RMS, the peak voltage being 0. 9v equivalent to 1. 8A. You can see that the current doesn`t start to flow (indeed its negative slightly at the start of the cycle which is due to the back emf/collapsing field of the previous cycle) until 0. 7mS into the cycle, it then ramps up due to the inductance of the coils (these being high inductance motors i. e. not very fast) until it finally gets to the current limit and the driver goes into chopping. At 750stesp/sec the RMS current has dropped to about 1A, the peak still being 1. 8A. This is because the initial start-up and ramp is a greater proportion of the cycle time. At 900steps/sec the current never gets to the set limit before the cycle ends. this is the fastest the motor will go at this voltage and the power output wil be low, the RMS current here is about 0. 5A. I set the board to it`s lowest current setting on the DIP switches to make sure I did not burn out or over heat my stepper motor, I am only testing X-Axis atm. Powered up the board, and all the lights and the fan came on, Turned it all off and, when I next turned it back on, I was greated with a nice pop / bang, with sparks, and blue / white smoke. I set the board to it`s lowest current setting on the DIP switches to make sure I did not burn out or over heat my stepper motor, I am only testing X-Axis atm. Powered up the board, and all the lights and the fan came on, Turned it all...



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