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bldc motor wire length
Hello experts,
I have a 3 phase BLDC motor controller board: current is limited to 3A.
I am PWM ing the FETs at 20 KHz.
Motor inductance 4.5 mH, resistance 2Ohms.
Ta the radiated emisiions tests, the whole assembly is over the limits at 20 KHz, 700 KHz, 190 MHz and...
a3930 application note
Hello masters of electronics.
Does anybody know how to calculate power losses for 3 Half H bridges driving a Brushless DC motor (3 phase). This would include switching power losses and conduction power losses and body diode reverse recovery losses.
I use 3 X IRF7341Q...
Hello everybody,
Did anybody, by any chance, design an automotive pump controller (brushless motor). The pump lies immersed in the tank.
Some schematics/examples would help.
Thank you a lot.
nike
Thank you Verba,
Yes there is some very thin solder mask in between the pins and we tried to widen it but the PCB manufacturer couldn't do it.
Meanwhile I found some documents talking something about "solder robbing" and found some guy on the IPC site blog, mentioning same kind of issue, and he...
2n7002 mosfet switch using 3v pic
Hi Paul,
Thanks for your answer but I wasn't going to use that one for anything, I just quoted IanP, and made an observation that we should probably take into consideration the Gate Charge Characteristics, when looking for the Gate threshold voltage, I didn;t...
pnp mosfet applications
Greetings Everybody,
With regards to this FET:
"For your application I would suggest the very popular 2N7000-series with the Vgs<3V ..
h**p://www.fairchildsemi.com/ds/2N/2N7000.pdf "
I believe for 500mA drain current you need to drive the Gate with more than 4V, that...
Hello experts,
Issue: bridging between 3 adjacent pins at SMT
Given: an IC 36 pins with very fine pitch, 3 adjacent pins are conected together by a single wider copper trace by design.
Question: These 3 pins are getting bridged and Manufacturing Dept brought this up as an issue since it fails...
Hi techie,
Reading in the Clayton Paul's book "Introduction to EMC", recently, I found one possible reason why somebody would want to have higher frequency instead lower. Say there are 2 bus lines on the board, both with 10 MHz freq. In that case there will be two harmonics from each line at...
I decreased the frequency and increased rise/fall time as well (low pass filter).
My question was: how can one improve EMC by increasing frequency because I thought you do it by decreasing frequency, and this is the way to go, but someone more experienced than me told me I didn't necessarly...
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