Numerical calculation and analysis of stator iron losses due to rotational flux and magnet pole eddy-current loss in PMSM;

Based on the Bertotti iron loss separate model,a calculation model of iron losses of electric magnetic material fed by PWM inverter is proposed using the Bessel function,considering the influence of the inverter parameter,the numerical relationship of material loss between sinusoidal voltage supply and PWM voltage supply is presented,it provides a new theory of the study on electric material.

Finally,eddy current losses and hysteresis losses are separated from iron losses of BSRM using the double frequency method with each of the three control strategies,respectively.

The equipment selection, test wiring and test method during the field test for stator core loss of 600 MW generator are expounded in detail, this can provide much useful experience to the field test for stator core loss.

Analyses the formation and essence of iron loss on electrical machine,discusses the demagnetization principle of armature reaction of direct current machine,specifies the implication of parallel operation of synchronization generator by quasi-synchronous method,thereby understands relative concepts deeply.

Secondly, the producing principle of stator iron loss and rotor eddy-current los

Reducing no-load loss of transformer iron core on locomotive;

Effects of adopting transformer electrical steel and HIB steel on no-load loss and noise level of transformer are analyzed.

The distribution of magnetic flux density in the iron core was studied by applying a voltage,voltage waveform and frequency change while the no-load loss of transformer was being measured,and the factors having effect on the measurement of no-load loss of transformer were theoretically analysed in detail.