and velocity was about 5 % of the rated currents. The
PMSM and controller parameters listed in Table 1 were
used. A position profile is shown in Fig. 1. The current tracking performances in the each phase are shown
in Fig. 2. The current tracking error in the case 1 was relatively larger than error amplitude in the case 2. Phase lags
in the current are shown in Fig. 3. In case I, the relatively
large phase lag appeared due to the use of LPF. On the
other hands, the phase lag was reduced by the proposed
FLPF. Note that the amplitudes of the currents were decreased due to the nonlinearities of the PWM drivers. Position tracking errors of both cases are shown in Fig. 4.
We observed that the current tracking error in the first
case was relatively larger than that in the Case II. Therefore, the position tracking error of both methods are related with a reduction of the current tracking errors.