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Recent content by AgnesAnna

  1. A

    Circuit to capture the motor inrush current

    The same motor was tested in an industrial research association by the automotive industry. That's how i know the actual value. But these tests are very expensive. Hence , we are trying to replicate it in our lab. The circuit i posted i got it from the document International Standard ISO...
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    Circuit to capture the motor inrush current

    Hi, I am trying to capture the inrush current waveform of a pmdc motor in an oscilloscope. When the actual inrush current value is 75A, we are able to capture only 44A with set up shown below. The artificial network used is a RLC filter circuit. Please suggest any other alternative arrangement...
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    Heat sink for MOSFET

    Sorry for that....I hope it's ok now...
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    Heat sink for MOSFET

    I used a schottky SiC diode- STPSC1206D(600V,12A ).I didnt use a snubber circuit nor heat sink. Can it be the reason? Is there any other possible reason?? MOSFET used is SPW17N80C3(800V,17A).
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    Heat sink for MOSFET

    **broken link removed** Here i have attached the schematics of the circuit developed. While doing hardware, at the gate of mosfet , a 20 ohm resistor was connected. Also, the secondary terminal of inductor connections which are used to give Vcc to UC3854 was removed and an external dc supply of...
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    Heat sink for MOSFET

    Hi all, I would like to know whether it is compulsory to use heat sink for MOSFET or boost diode in PFC circuit. I have used UC3854 IC for switching the MOSFET in the boost converter. A 20 ohm resistor was connected in series to the gate. 17 V Vcc was given to UC3854 IC. Is there any...
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    BLDC motor controller- Hall sensor placement

    how does it affect the speed. How can you prove it?Can u explain the logic behind it
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    BLDC motor controller- Hall sensor placement

    But u didn't mention about the relation between angle and speed. Is it possible to switch a 3 phase bldc with 2 hall sensor ? What is the programming logic?
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    BLDC motor controller- Hall sensor placement

    How exactly does the angle between each hall sensor affect the speed of a 3 phase BLDC motor. Is there any formula connecting the two? It was observed that speed reduced with increse in angle. But i couldn't understand why. Is it because of the programming done in the controller? How exactly is...
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    controller for single phase bldc motor

    Hi all, Here i have attached the controller circuit schematics(done in LTSpice) for single phase BLDC motor. The basic working is that based on the hall sensor signal, the current output of H bridge inverter should reverse. Across points A & B we'll be connecting the motor. Here the pulse...
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    power supply for motor controller (emi filter inductor, boost inductor)

    Hi all, I am designing a motor controller for bldc motor(540W, 230V). While designing the power supply section i am using an EMI filter section and a PFC boost section too. In EMI filter a common mode choke is used. my doubt is what should be the current rating of the choke. In some design...
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    BLDC motor controller

    Hi, I am developing a bldc motor controller and is in the starting stage.In one of the design file , i have seen the input stages are as follows: supply, emi filter, boost converter, phase shifted full bridge converter, synchronous rectifer and then comes the inverter. My doubt is why cant we...
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