Experimental results have been taken and are shown in Fig. 15 and Fig. 16. Fig. 15 shows the pulses with different width captured at different time. These pulses are the output of the gate driver (amplified gate signal for transistors). Fig. 16 shows the currents for auxiliary winding and main winding at rated speed, voltage and load. It is noted that they are sinusoidal except for some high frequency harmonics. The amplitude of the auxiliary winding current is bigger than that of main winding because the impedance of the auxiliary winding is bigger.
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