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Recent content by sravan_rikka

  1. S

    [Moved] I am M.TCH student looking for a job in embeddede systems

    Hi, I am M.TCH student looking for a job in embeddede systems, can you suggest me the companies in hyderabad.
  2. S

    Variable Speed Control in BLDC fan using external MOSFET

    Hi, Yes i observed that minimum voltage to turn on BLDC Fan is 3.2V, it is not rotating for voltage blow 3.2V. I am using single phse motor. And by applying 60% duty cycle only it is turning ON. At the time of 60% duty cycle voltage across fan is 5.38V, At 50% duty cycle the...
  3. S

    Variable Speed Control in BLDC fan using external MOSFET

    Hi, Is BLDC motor is works with AC supply, then why we are calling it as BLDC motor.
  4. S

    Variable Speed Control in BLDC fan using external MOSFET

    Hi, I dont know the inductance of coil and also dont know resistance, can you tell me how to calculate L and R. Yah i observed by incresing frequency, i used 19.61Khz frequency then the fan started rotating at 95% duty cycle untill 95% duty cycle it is not come into motion...
  5. S

    Variable Speed Control in BLDC fan using external MOSFET

    Hi sir, How do we calculate the inertia and time constant of machine. I am using square wave PWM technique. - - - Updated - - - Hi sir, How do we calculate the inertia and time constant of machine. I am using square wave PWM technique.
  6. S

    Variable Speed Control in BLDC fan using external MOSFET

    Hi, I am using 12V BLDC Fan and external MOPSFET to control the speed of Fan, i generated the 1.22KHz PWM signal using microcontroller. I am varying the duty cycle of PWM signal for variable speed control of Fan, when i am starting from the 0% duty cycle and then increasing the...
  7. S

    BLDC Motor drawing more current at starting but not running why?

    Hi, I am working with BLDC Fan, which consists of BLDC motor inside. Why motor takes high current when it is not running. Thanks a lot.
  8. S

    BLDC Motor taking high current but not running bofore going to run

    Hi, I am working with BLDC Fan, which consists of BLDC motor inside. Why motor takes high current when it is not running. Thanks a lot.
  9. S

    12V DC Fan controlling

    Hi sir, I have oscilloscope but unable to capture picture. I incresed voltage from 0V to 12V and observed that speed of the fan is increased as the voltage increases from 0V to 12V.
  10. S

    12V DC Fan controlling

    Hi sir, when i applied 60% duty cycle to the MOSFET the fan will run, untill 60% it wont be ON, i cant understood why it could be ON for 60% duty cycle only, this thing happens when PWM frequency is 1.22KHz. when i use 19.61KHz the fan is running for 95% duty cycle and when i use 4.90KHz...
  11. S

    12V DC Fan controlling

    Hi sir, I sent my circuit in PDF format plese help me..............
  12. S

    12V DC Fan controlling

    Hi Sir, I want to control 12V DC Fan using PWM. IRF540N MOSFET is used to drrive the DC Fan. DC Fan is what type of load is it inductive.which type of equivalent model can use either small signal or large signal model. what is the equivalent model for attached circuit. how...
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