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InstaSPIN_BLDC unable to achieve 500 rpm on-load operation

user4708725
Expert 1030 points

The software path I used: DRV830x-HC-C2-KIT_v105\GUI_project_InstaSPIN_BLDC

Maxon parameters are as follows:

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
Speed/torque gradient rpm/mNm                                 109
Mechanical time constant ms                                           2.04
Rotor inertia gcm                                                                  1.79

1. When EnableFlag=1,Set the motor speed at 500rpm, the motor runs normally, When the motor is loaded, the motor runs abnormally or even stops running.

How to solve the problem of on-load operation of the motor?

2. I used Instaspin foc to drive the motor mentioned above. The motor run normally 500rpm, When the motor is loaded, the motor can still operate normally.

How to solve the problem of Instaspin BLDC on-load operation?

  • 0
    TI__Guru** 115480 points

    1. That's right, the resolution of BEMF is not enough to detect the correct commutation point when the motor is running with low speed.

    2. InstaSPIN-FOC uses both current and voltage to estimate the rotor position that has better performance than the sensorless trapezoidal control in most cases. 

    It seems like the sensorless-BLDC/PMSM is very tough for your application, so you may try the BDC or sensored-BLDC/PMSM that should be more easy to meet the control requirement.