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HVBLDC_Sensored; how to Output Large Torque at 400rpm?

Other Parts Discussed in Thread: CONTROLSUITE

The software path I used:  D:\ti\controlSUITE\development_kits\HVMotorCtrl+PfcKit_v2.1\HVBLDC_Sensored

Hardware:DRV8303Evm Ver.C

I have confirmed that the procedure has been correctly modified.I set the program to run in Level6.

Maxon parameters are as follows:         pole pairs =1.

Nominal voltage V                                                               24
No load speed rpm                                                              60800
No load current mA                                                             282         
Nominal speed rpm                                                             57500
Nominal torque (max. continuous torque) mNm     23.6
Nominal current (max. continuous current) A            6.45
Stall torque mNm                                                                 561
Stall current A                                                                        149
Max. efciency %                                                                      91.6
Terminal resistance   Ohm                                                  0.161
Terminal inductance mH                                                    0.0171
Torque constant mNm/A                                                   3.76
Speed constant rpm/V                                                        2540

1. When EnableFlag=1,SpeedRef=40000rpm/10000rpm,Motor starts to run normally, The motor has enough torque output, the speed of the motor does not slow down when it encounters the load.

2. When EnableFlag=1,SpeedRef=400rpm/200rpm,Motor starts to run normally,Gradually and slowly increase the load, and the motor can output a great torque. However, when I increase the load a little faster, the motor will slow down or even stop running. At this time, the motor will still not rotate when I release the load.The motor can be rotated only when the motor shaft is assisted by hand,I hope that the motor can also output large torque when the load increases rapidly at 400 rpm/200 rpm. How can I achieve this?Thank you for your guidance. This is very, very important to me.

3.I have used Instaspin FOC to achieve the functions mentioned above.Sensorless algorithms can be  realized. Why can't(HVBLDC_Sensored) square wave control with Hall be realized?