BLDC Motor Noise Issue During Six-Step Commutation
Hi Team,
I am currently working on a 48V HALL sensored based BLDC motor control system (three-phase) using the STM32F405RGT6, DRV8300, and STP100N10F7 MOSFETs. The motor is running using six-step commutation PWM.
Although the motor is rotating, I am experiencing significant noise during operation. I have tested PWM frequencies ranging from 12 kHz to 20 kHz and am currently using a dead time of 1.25 µs.
Under no-load conditions, the phase outputs (U, V, and W) appear correct. However, when the motor is connected, the waveforms on all three phases become distorted and are not as expected.
I have attached the output video and image for reference. Could you please suggest possible solutions to reduce the noise and improve the waveform quality? Any guidance, tuning recommendations, or reference code would be greatly appreciated.
Regards,
Veerapandiyan V.
1.With_Out_Load_ON_PHASEA_HIGH_SIDE(yELLOW_lOW_SIDE_Blue)
Without_LOad_On
2.With_Out_Load_Off_PHASEA_HIGH_SIDE(yELLOW_lOW_SIDE_Blue)
Without_LOad_Off
3.With_Out_Load_MOSFET_WaveForm_PHASEA_HIGH_SIDE(yELLOW_lOW_SIDE_Blue)
4.With_Load_MOSFET_WaveForm_PHASEA_HIGH_SIDE(yELLOW_lOW_SIDE_Blue)_1
With_Load_1
5.With_Load_MOSFET_WaveForm_PHASEA_HIGH_SIDE(yELLOW_lOW_SIDE_Blue)_2
With_Load_2
6.With_Load_MOSFET_WaveForm_PHASEA_HIGH_SIDE(yELLOW_lOW_SIDE_Blue)_3
With_Load_3
7.With_Load_MOSFET_WaveForm_PHASEA_HIGH_SIDE(yELLOW_lOW_SIDE_Blue)_4
With_Load_4
8.With_Load_MOSFET_WaveForm_PHASEA_HIGH_SIDE(yELLOW_lOW_SIDE_Blue)_5
With_Load_5
9.With_Load_MOSFET_WaveForm_PHASEA_HIGH_SIDE(yELLOW_lOW_SIDE_Blue)_6
With_Load_6
10.With_Load_MOSFET_WaveForm_On_Off_PHASEA_HIGH_SIDE(yELLOW_lOW_SIDE_Blue)_7
With_Load_On_Off
11.3.3Volt_Power_Li
3.3V_Power_Line_Switching_Time