1Kw Motor Driver
I am building 1Kw Motor Driver with following specification
max voltage 48V
max Current 25Amps
Motor to run BLDC motor
Components used
- Mosfet IRF3205
- Driver Ir2101
- Boost Cap 1uF Box type
- Gate Resistance 11 ohm
- Micro used ATMega8
- PWM on low Switches only
- Switching frequency 8 KhZ
- Heat sink area is 10 time the mosfet area
- Ambient Temperature is 30 Degree Celsius
Problem :->Heat sink gets heated up to 65 Degree Celsius @ 3 Amps, 24 V only, after running it for 10 mins,
which is very high
Tried few things
- Changed drivers with higher current rating IR2181 but no change in outcome
- Changed Gate resistance to 22ohm but no change
- Changed gate resistance to 5 ohm but no change
- Changed switching frequency to 4kHz => temp increasing to 70 degree Celsius + lot noisy operation
One problem which I have discovered is with the hall sensor placement. if that is not correct/accurate then it caused problem. since I was trying to run the home made motor (24 slot 28 pole) which might have inaccuracies in sensor placement, might be the root cause of the problem.
I changed it with some other motor and things seems fine for the moment(48 V 3 Amps, NO heating) but the driver is getting little hot after some time which made one of the micro pin(high side) bad.
max voltage 48V
max Current 25Amps
Motor to run BLDC motor
Components used
- Mosfet IRF3205
- Driver Ir2101
- Boost Cap 1uF Box type
- Gate Resistance 11 ohm
- Micro used ATMega8
- PWM on low Switches only
- Switching frequency 8 KhZ
- Heat sink area is 10 time the mosfet area
- Ambient Temperature is 30 Degree Celsius
Problem :->Heat sink gets heated up to 65 Degree Celsius @ 3 Amps, 24 V only, after running it for 10 mins,
which is very high
Tried few things
- Changed drivers with higher current rating IR2181 but no change in outcome
- Changed Gate resistance to 22ohm but no change
- Changed gate resistance to 5 ohm but no change
- Changed switching frequency to 4kHz => temp increasing to 70 degree Celsius + lot noisy operation
One problem which I have discovered is with the hall sensor placement. if that is not correct/accurate then it caused problem. since I was trying to run the home made motor (24 slot 28 pole) which might have inaccuracies in sensor placement, might be the root cause of the problem.
I changed it with some other motor and things seems fine for the moment(48 V 3 Amps, NO heating) but the driver is getting little hot after some time which made one of the micro pin(high side) bad.
