W123
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This document discusses using single-pulse control for a low-performance fan motor that does not require fine current control. Single-pulse control employs voltage-fed pulses and is best suited for running the motor at top speed. The document illustrates the optimal commutation in single-pulse mode through a figure showing the desired waveforms of main and auxiliary winding currents and the voltage of a capacitor.
W123
- 1. voltage-fed, single-pulse control is employed. Although finer current control is not achievable with the single-pulse control, this is not a significant drawback since the target low performance fan type applications do not require finer current control. Furthermore, the motor will run mostly at top speed where single-pulse control is best suited. The optimal commutation in single-pulse mode is illustrated in figure 4, which shows the desired waveforms of main and auxiliary winding currents (im, ia), and the voltage of the capacitor Cr (VCr).