Motor secundum PWM inverter output (pulsum latitudinis modulation, similis alta celeritate switch) modos ad manipulate, ita producit altum frequency leakage current. In his factores determinare magnitudinem systematis leakage vena et lectus convenientem lacus circuitu et necessariis mensuras ad amplio phaenomenon leakagium Circuit ruptoriensis tripping post mittendo. Primo omnium, tres gradu ante inverter, potestatem copiam Transformer, motor traductionem fabrica PE punctus simul et consistit in terra. Inverter est princeps frequency quadratum undam intentione output, quia intra motricium coil et motor crusta equivalent capacitance inter existit, tunc ad leakage current. Si nullum grounding vel malus, erit lacus phaenomenon. Leakage current magnitudine elementa sunt: (I) cable leakage current (illic es duas partes) ad leakage circuitu perruptionem, filter et leakage current de funem longitudinem. Leakage current frequency converter, motor cable longitudinem. (II) et leakage current de filter (including frequency converter). (III) ad leakage current de motricium. Quidam site usura inverter imperium motricium, potest praesens lacus problema, dozens of creepage voltage v ad ducenti V voltage range. Attendens ad hoc problema, praesertim analysis huius generis phaenomenon ratio est ut sequitur: De ex function of the inverter imperium motricium opus Diagram, tres-phase potentiae copiam ad Converter Pontem, Tres Creanti Frequency et Voltage Tres Rase Created Frequency et Tres Recte, Tres Created et Frequency ad Motor Tres Rase, Tria Murd CXX gradus alterna current fluens in tres-phase start coil curvis motricium, rotating magnetica agro, ut rotor in rotator in agro motricium, et secundum genus rotatam, in testa in motricium in electro, et in fontibus electromotive vis. Et adductus electromotive vis mole, pendeat in magnitudine switch frequency of inverter igbt et c × DV / DT (ad Celeritatem Suspendisse est maior, sic et in Motricium Senteneribus frequency est altior, efficacius vi motricium voltage)The higher, and the frequency converter for motor control precision and dynamic echo is higher, after the body touch the greater is the feeling of electric; On the other hand, the IGBT switching frequency is lower, the effective value of motor shell of induction electromotive force (Induced voltage)After the lower, and from the body touch is the feeling of power. For asynchronous motor, motor shell will be induced voltage (The so-called leakage), so, motor manufacturers will be in the motor factory, in the junction box inside install earthing terminal, convenience in bridging the earth when it is applied to eliminate the induced electromotive force (Eliminate voltage induced leakage)To deal with the human touch is the feeling of electric motor. When work motor, power frequency switching frequency is approximately 50 hz, power frequency is very low, so usually can't have the feeling of leakage (Unless the motor insulation is very poor)。 And the inverter control, because its switching frequency is much higher than the work frequency, so the inverter in the rolling control motor, motor shell will have the feeling of the leakage.
