Hi all,
sorry, I am newbie.
I made one circuit to control my BLDC motor,
using MC33035 and MC33039.
I attach both of Datasheet here.
I use circuit in Datasheet MC33035, figure 39.
For inverter part, I use IRF9530 for upper part, and IRF540PBF for lower part.
Please see the excel file and datasheet of these two parts.
I am using microchip microcontroller, but I will skip this part.
Using this combination, my circuit is working. I succeeded rotating my BLDC motor.
So, no problem in circuit, nor in programming part.
But when I change to bigger BLDC motor, then result is, it can not rotate this bigger BLDC motor.
I have to rotate by myself, then it will start to rotate.
In my understanding, bigger BLDC Motor must need bigger Torque, so it need bigger current (off course).
But when I tried to increase Current Source until around 7.5 A (I did not exactly remember, but around this amount), problem still happen (can not start to rotate by itself), then one of my Controller is burned.
Now, I am checking it using smaller current (max 2A), but still can not find the root cause.
Note: Voltage source is 24V.
My questions are:
1. Is my understanding correct: Need more Torque mean need more current source?
2. So in this problem, I have to increase more current, until this bigger BLDC start to rotate?
3. increasing current source to 7.5A burned my controlled, if I want to increase current amount (without burning my controller) which part should I change?
4. It seems the burned one is not the inverter, but logical part (Microcontroller).
Why this burn happen?
5. After I check, it seems that overcurrent signals many time become ON. So, voltage in RS is too big?
so, I need to change Rs value to lower one? is it safe?
Sorry for many questions, I really don't understand and need your support.
Thank you.
Definitely, this is because
sorry, I am newbie.
I made one circuit to control my BLDC motor,
using MC33035 and MC33039.
I attach both of Datasheet here.
I use circuit in Datasheet MC33035, figure 39.
For inverter part, I use IRF9530 for upper part, and IRF540PBF for lower part.
Please see the excel file and datasheet of these two parts.
I am using microchip microcontroller, but I will skip this part.
Using this combination, my circuit is working. I succeeded rotating my BLDC motor.
So, no problem in circuit, nor in programming part.
But when I change to bigger BLDC motor, then result is, it can not rotate this bigger BLDC motor.
I have to rotate by myself, then it will start to rotate.
In my understanding, bigger BLDC Motor must need bigger Torque, so it need bigger current (off course).
But when I tried to increase Current Source until around 7.5 A (I did not exactly remember, but around this amount), problem still happen (can not start to rotate by itself), then one of my Controller is burned.
Now, I am checking it using smaller current (max 2A), but still can not find the root cause.
Note: Voltage source is 24V.
My questions are:
1. Is my understanding correct: Need more Torque mean need more current source?
2. So in this problem, I have to increase more current, until this bigger BLDC start to rotate?
3. increasing current source to 7.5A burned my controlled, if I want to increase current amount (without burning my controller) which part should I change?
4. It seems the burned one is not the inverter, but logical part (Microcontroller).
Why this burn happen?
5. After I check, it seems that overcurrent signals many time become ON. So, voltage in RS is too big?
so, I need to change Rs value to lower one? is it safe?
Sorry for many questions, I really don't understand and need your support.
Thank you.
Definitely, this is because
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