SPRUHJ1I January 2013 – October 2021 TMS320F2802-Q1 , TMS320F28026-Q1 , TMS320F28026F , TMS320F28027-Q1 , TMS320F28027F , TMS320F28027F-Q1 , TMS320F28052-Q1 , TMS320F28052F , TMS320F28052F-Q1 , TMS320F28052M , TMS320F28052M-Q1 , TMS320F28054-Q1 , TMS320F28054F , TMS320F28054F-Q1 , TMS320F28054M , TMS320F28054M-Q1 , TMS320F2806-Q1 , TMS320F28062-Q1 , TMS320F28062F , TMS320F28062F-Q1 , TMS320F28068F , TMS320F28068M , TMS320F28069-Q1 , TMS320F28069F , TMS320F28069F-Q1 , TMS320F28069M , TMS320F28069M-Q1
The SpinTAC Inertia Identification process is very quick. It needs to accelerate and decelerate the motor in order to build an estimate of the system inertia. Prior to the inertia identification process a couple of conditions need to be satisfied.
The estimate of the inertia could be incorrect if it begins the torque profile while the motor is already moving.
SpinTAC Velocity Identify needs to provide the Iq reference in order to test the inertia. This can be achieved only if the InstaSPIN-FOC PI speed controller is disabled.
The FAST estimator needs to know the spinning direction of the motor via speed reference in order for it to correctly estimate the speed. The value can be any positive value for speed reference setting.
The Force Angle provides a good start from zero speed, and produces better inertia estimates.
Figure 8-4 is a flowchart that shows the steps required prior to enabling SpinTAC Velocity Identify.
Figure 8-5 is a plot of the continuous torque curve that is applied to the motor. Both positive and negative torque is applied during the SpinTAC Velocity Identify process. Torque is initially applied to the motor in order for the motor rotor to be properly aligned prior to the inertia identification process.
This results in the motor spinning as described in Figure 8-6. It is important that the motor is spinning continuously during the inertia identification process. If the motor stops during the inertia identification trial, the configuration parameters should be adjusted and the inertia identification process should be repeated. For more information about how to correct for common configuration errors during inertia identification, see Section 8.5.
This represents the typical case. For more information about how to identify the system inertia for motors with high cogging force or large friction, see Section 8.6.