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Recent content by vishjay

  1. V

    Motor current testing

    Hallo, Three phase Ac is output. Input is DC supply It is a brushless dc motor Thanks
  2. V

    Motor current testing

    I mean one end of current probe.
  3. V

    Motor current testing

    Thabks klaus i put the motor‘s positive wire in the current probe and one end of the probe connected to scope. But during the motor movement the input current in the power supply shows 3Amps but in the scope waveform shows something like 1Amp Did i connect the set up correctly?
  4. V

    Motor current testing

    Motor is driven varying voltage (voltage mode). Well it runs with pwm control . I just want to see the input current waveform using current probe connecting with scope. How are the connections should be?
  5. V

    Motor current testing

    Hi all, I know it is a small question but when i tried i didnt get it. So i just want to make sure whether i did any wrong test. How to measure the input current of my stepper motor? During the movement of motor i connected current probe and didnt get how i want? Can anyone tell me please. Thanks
  6. V

    Back EMF Bldc zero crosiing detection

    Hi all, what are the main abnormal things that occur in bldc back emf zero cossing detection commutation software (closed loop) sensorless technique? what are the main things to make sure that our development is correct as expected? what are the common failures and causes? can anyone exlain...
  7. V

    brushless motor open loop and closed loop in sw

    Ok Klaus, Thanks. how much ramp up speed should be in the start up ramp? and how to see this accleration ramp up in the CRO?? can you please suggest? thanks
  8. V

    brushless motor open loop and closed loop in sw

    hi, how does the bldc motor switch from open loop to closed loop and how does it work in software?
  9. V

    Longer deadtime or blanking time between two mosfets of one leg phase U or v or w

    Thank you all for the answer. On full duty cycle, i can’t see deadtime on scope perfectly. I increased to the max voltage and then i can see deadtime in scope. But on both pulses there is no clear pulse instead there is little under and over compensated pulse. How to see clear pulse without...
  10. V

    Longer deadtime or blanking time between two mosfets of one leg phase U or v or w

    Hi, Can the longer dead time cause distortion in output waveforms? And as a result torque ripple?? And can we perform the operation also without giving deadtime in bldc motor control?
  11. V

    Diff probe connections to oscilloscope

    The differential that i use has a auxillary ground pin with bnc pin. So i connected bnc pin to channel of the scope. And how to connect ground pin to scope?
  12. V

    Diff probe connections to oscilloscope

    Hi, How to connect differential probe bnc pin and ground pin to oscilloscope. I know how to connect differentil probe bnc to oscilloscope channel but how to connect ground pin of differential probe to oscilloscope?
  13. V

    BLDC motor delta winding

    Can i connect power resistors in Y shape? Is it ok?
  14. V

    Phase current motor measurements with cro

    Hi, How to measure phase current waveforms for delta connected motor using current probe with oscilloscope? How to connect the scope probes? Thanks
  15. V

    BLDC motor delta winding

    I meant i want to see the motor phase voltages for our delta connected motor. The three wires out from the motor, but there is no neutral wire. So i am asking how to see how the phases are reacting while motor runs.
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