3 Phase-controlled DC motor drives
3 Phase-controlled DC motor drives
3 Phase-controlled DC motor drives
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• The bridge conduction is delayed in latterbeyond positive zero crossing.• The delay angle is measured from the zerocrossing of voltage waveform and isgenerally termed α.• Thus, this voltage is quantified asVdc=1π∫α+παVmsin( ωst)d( ωst)=2Vπmcosα