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Recent content by alexplace2001

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    3 Phase Inverter with braking diodes

    3 phase inverter Hello I've seen that some 3 phase bridge topologies use three extra diodes in serires in the branch. This topology is shown in the image bellow. For a BLDC motor drive, will this topology help to handle back EMF? will this make a more robust brige? what other considerations...
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    Burning (turned to a wire) IGBTs in a three phase inverter b

    igbt dc bus inverter Hi Again. I'm checking some measurments I took today, from the IGBT inverter bridge. The tests where made at a 50Vdc bus voltage. With the motor as inductive load. The dead time is 8us, automatically generated by the PWM module on the dsPIC. The Image "print_11" are the...
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    Burning (turned to a wire) IGBTs in a three phase inverter b

    bldc hall sensor timing advance circuit Hi Again I'm posting the signals of the final PWM scheme. I hope I've understanded right this time. mananshah: Well before doing a drive you need to kwon the target motor. It's true that the 3phase bridge topology is the same for Induction, synchronous...
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    Burning (turned to a wire) IGBTs in a three phase inverter b

    igbt dead time Hi mananshah I'm attaching a document that has many formulas for snubber circuit calculation. About PWM sequence I was using the sequence found in all microchip application notes. No I've changed thanks to FvM, this PWM scheme gives you a better torque at low speeds. I'm using...
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    Burning (turned to a wire) IGBTs in a three phase inverter b

    burning test for igbt modules Thanks FvM. I've made the change in the PWM scheme. Now my position PI works fine, I need some time to adjust Gains, and add an acceleration ramp. Thanks once again. I thought the PWM scheme I was using was usefull, because I saw it in almost al the BLDC app...
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    Burning (turned to a wire) IGBTs in a three phase inverter b

    ir2210 driver burning Thanks FvM. I'm getting confused here with the control signals. The next image shows what control signals Im sending to the inverter bridge. Active: means a solid 15v to the lower IGBT gate. PWM: a 10Khz with a max 75% duty to high IGBT. off: the IGBT should be an...
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    Burning (turned to a wire) IGBTs in a three phase inverter b

    igbt inverter bridge images Hi Again The capacitors solved the rising voltage problems in the DC voltage bus. I attempted to the controller (postion PI with velocity PI in cascade), but I had many problems with the bootstrap capacitors getting discharged. So I had changed the PWM scheme...
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    Simulation software with mosfet driver component (IR2110)

    Re: Simulation Software Hi A teacher recomended me the LT spice. He told me that it includes the ir2110 for simulation. You can download it by registering. You coun found the link by searching in google. Hope this helps. Alex
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    need help to drive a bldc

    Hi I will recomend you these app notes, they cover the basics of BLDC: https://ww1.microchip.com/downloads/en/AppNotes/00857a.pdf https://ww1.microchip.com/downloads/en/AppNotes/00885a.pdf It will also help to know: what is the motor voltage rating? what do you want to move (application)...
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    Vibration of BLDC motor in Low speed region

    low speed bldc motor Hi Nandulal I'm also developing a 3phase BLDC drive 300v 5 amp, still testing it at 180v, using a dsPIC30F3011. I have the vibration problem when moving the motor at low speed. I think this is named cogging. It is caused by torque ripple during pole changes. Also static...
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    Brushless Dc motor does not rotate without hand force

    why my dc motor can not start? Hi gsecer Well the voltage rise, were spikes of of 160v, measured with a oscilloscope. A multimeter won't meausre this kind of spikes. You don't loss anything by adding the bus capacitor, give it a try. Alex
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    Brushless Dc motor does not rotate without hand force

    24v bldc driver Hi gsecer I think I was in this situation last week. Try Adding a 4700uF(50v or +) capacitor parallel to your 24v DC bus. This may solve your problem. What is happening here is, that the current circulating through the motor inductance is being converted to voltage because...
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    Brushless Dc motor does not rotate without hand force

    bldc 100% duty cycle bootstrap Hi gsecer I'm also developing a BLDC drive using the IR2110. check: I've posted my shcematic and many wave forms. I started by experimenting with a small 24v BLDC motor. At some moment I had the same problem you describe "Dc motor does not rotate without...
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    Burning (turned to a wire) IGBTs in a three phase inverter b

    dead time inverter igbt Thanks GetDeviceInfo. I think my problem was that I did not have bus capacitors. I added two 820uF (1.6mF total) capacitor to the DC BUS, and the voltage spikes and rising stopped. The measurements I used to get to this conclusion are in the following images. The test...
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    Burning (turned to a wire) IGBTs in a three phase inverter b

    igbt switch scheme in three phase inverter Hi FVM I have only two little bus capacitors. One 0.1uF at the output of the power supply, then a couple of 14 gauge 15cm long cables go to the inverter board, where another 0.1uF capacitor is placed between the bus terminals. Do I need to put more...
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