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Original question:
TMS320F28069F: Rotor position calibration during PMSM startup
Dear experts: I am conducting a PMSM sensorless experiment, Lab10e, but I encountered a problem that the motor cannot reach the maximum speed.
Motor parameters:
Line voltage: 220V, rated speed: 2500rpm, 4 pairs of poles, 3 phases, rated current: 7.5A, line to line resistance: 1.01 Ω, line to line inductance: 2.94mH
user.h:
USER_ MOTOR_ Rr (NULL)
USER_ MOTOR_ Rs (0.505)
USER_ MOTOR_ Ls_ d (0.0147)
USER_ MOTOR_ Ls_ q (0.0147)
USER_ MOTOR_ RATED_ FLUX (0.8165*220.0/(2500*4/60))
USER_ MOTOR_ MAGNETIZING_ CURRENT (NULL)
USER_ MOTOR_ RES_ EST_ CURRENT (0.2*1.414*7.5)
USER_ MOTOR_ IND_ EST_ CURRENT (-0.2*1.414*7.5)
USER_ MOTOR_ MAX_ CURRENT (1.5*1.414*7.5)
USER_ MOTOR_ FLUX_ EST_ FREQ_ Hz (20.0)
Runtime: When the speed increases, Flux_ VpHz decreases. When it exceeds about 950rom, it does not change. At the same time, Vs also increases, and motor noise also increases. When the speed reaches about 1450rpm, Vs suddenly changes to 0.5 and Vd suddenly changes to - 0.5, that is, the maximum modulation ratio. The motor runs unstably, and the speed decreases to about 1350rpm.
What is the reason? ADC sampling is correct because I have implemented the FOC for ACIM experiment.Is the V/Hz too high? Maybe USER_ VOLTAGE_ FILTER_ POLE_ Hz incorrect?No answer found in the forum.
Regards!
Quan
