- 1、Therefore,itisimpossibleVVVFunrestrictedspeed.2、OntherollerwithVVVFthree-phaseasynchronousmotordesign3、TheVVVFtransformationofsteel-ropetractingbeltconveyer4、VVVFsystemcontrolledby16-bitsinglechipisintroduced.5、Thispaperpresentsadoubleloopcont...
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