Part Number: DRV8301-HC-C2-KIT
Here're some problems from the customer may need your help:
The PM_Sensorless routine in the DRV830x-HC-C2-Kit_v105 development package for TI\controlSUITE\development_kits.
In this routine, the driver board samples the phase current using the lower leg configuration with 3 sampling resistors.
In the PM_Sensorless project, the 2-way built-in amplifiers of the DRV8301 are used to handle the voltage drop across the two-phase sampling resistors of U and V with a software-configured amplifier gain of 40.
However, the external detector amplifier is configured with a gain of 20, as shown in the following figure:
The three signals EXT_IA-FB, EXT_IB-FB, EXT_IC-FB are not used for the algorithm processing.
1) The gain of the DRV8301 internal amplifier configured in the PM_Sensorless routine is 40 and the gain of the external amplifier configuration is 20. If an external amplifier is used for algorithmic processing, the software gain needs to be configured to a factor of 20x?
2) Regarding the setting of PWM wave:
On the left is f2803xpwm.h（\TI\controlSUITE\libs\app_libs\motor_control\drivers\f2803x_v2.1）
On the right is f2803xpwm_PM.h（\TI\controlSUITE\development_kits\DRV830x-HC-C2-KIT_v105\PM_Sensorless）
As you can see on line 36, why is the setting of AQCTLA different with the same configuration?
3) The following figure shows the sampling instant, why is the configuration different?
On the left is f2803xileg_vdc.h（\TI\controlSUITE\libs\app_libs\motor_control\drivers\f2803x_v2.1）
On the right is f2803xileg_vdc_PM.h（\TI\controlSUITE\development_kits\DRV830x-HC-C2-KIT_v105\PM_Sensorless)
Could you help check this case? Thanks.