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Bldc motor driver problem

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prasadparange28

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I hav design and implemented BLDC motor driver.....The motor run properly but the main problem lies that when ever a motor is connected to driver circuit the motor doesnt start itself..I have to move manualy with my hands ,after that it run properly....Can you tell wheres the problem lies?what should i do it for it?
 

Starting torque takes more current and low ESR. Look at the voltage drop on your driver and consider better drivers. For BJT drivers, a current gain of 5 was normal and 10 was good. For fast switching of MOSFET the current gain of 50 is normal , and 100 to 200 is good and maybe more in IGBT. Even though static gate current is low. Switching current is high on gate due to capacitance

Without full disclosure of design details and test results, I can only guess.
 

SunnySkyguy said:
Starting torque takes more current and low ESR. Look at the voltage drop on your driver and consider better drivers. For BJT drivers, a current gain of 5 was normal and 10 was good. For fast switching of MOSFET the current gain of 50 is normal , and 100 to 200 is good and maybe more in IGBT. Even though static gate current is low. Switching current is high on gate due to capacitance

Without full disclosure of design details and test results, I can only guess.
Click to expand...

right on the money Sunny.... :)
 

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