Effect of Carrier Frequency and Circuit Resistance on Iron Loss of Non-oriented Electrical Steel Sheet under Single-phase Full-bridge PWM Inverter Excitation

Abstract

SUMMARY Because of the development of power electronics technology, pulse width modulation (PWM) inverters are now being used to drive motors in order to achieve precise and energy‐efficient control. Precise estimation of the increase in iron loss due to the high harmonic components of flux, including the carrier frequency, is important in the design of motors excited by a PWM inverter. We measured the iron losses of non‐oriented electrical steel sheets that were excited using a single‐phase full‐bridge PWM inverter, and examined the influence of the carrier frequency and circuit resistance on the iron loss. We showed that the iron loss increased because of the generation of minor loops when the circuit resistance was high. Therefore, the circuit resistance should be decreased in an actual motor system.

Iron Loss Characteristics of Electrical Steel Sheet under Inverter Excitation by Power Semiconductor with Extremely Low On‐Voltage Property

“…For this reason, evaluation of this difference is important for the realization of even greater improvements in motor efficiency. Consequently, the effects of inverter excitation on the iron loss characteristics have been evaluated [9][10][11][12][13][14][15][16]. From the viewpoint of the characteristics of magnetic materials, we have especially pursued basic investigations of the effects of the on-voltage characteristics of power semiconductors on the minor loop of magnetic characteristics and on iron loss.…”

Iron Loss Characteristics of Estimated ON-Voltage of Power Semiconductor by PWM Shaped Voltage Excitation

“…The decrement of B is caused by the time-integral of the V on . The V on of the power semiconductors is found to introduce an open and closed loop shape of the minor loops (8) (9) . Thus, the switching operation is one of the reasons of the iron loss increment.…”