Abstract
The magnetic properties measurement and analysis of soft magnetic material under the rotational space-vector pulse width modulation (SVPWM) excitation are key factors in design and optimization of the adjustable speed motor. In this paper, a three-dimensional (3D) magnetic properties testing system fit for SVPWM excitation is built, which includes symmetrical orthogonal excitation magnetic circuit and cubic field-metric sensor. Base on the testing system, the vector B and H loci of soft magnetic composite (SMC) material under SVPWM excitation are measured and analyzed by proposed 3D SVPWM control method. Alternating and rotating core losses under various complex excitation with different magnitude modulation ratio are calculated and compared.
Highlights
Soft magnetic composite (SMC) material, made by powder metallurgy techniques, has a number of advantages over traditional silicon steels commonly used in electromagnetic devices
The drive of adjustable speed electrical motor often adopts the space vector pulse width modulation (SVPWM) technique to increase the flexibility of the speed regulating system
Comparing with the three-phase sinusoidal excitation, the SVPWM excitation method can generate the harmonic currents with higher frequency to increase the total core losses significantly.[2]
Summary
Soft magnetic composite (SMC) material, made by powder metallurgy techniques, has a number of advantages over traditional silicon steels commonly used in electromagnetic devices. Comparing with the three-phase sinusoidal excitation, the SVPWM excitation method can generate the harmonic currents with higher frequency to increase the total core losses significantly.[2] it is more practical in engineering to measure magnetic properties under the rotational SVPWM excitation than those under the standard circular or spherical excitation. The coefficients of hysteresis and eddy-current losses can be calculated by the core losses decomposition algorithm under the sinusoidal waveform excitation These coefficients would be changed when the harmonics excitation is applied, especially in the region of high flux density.[5] an improved empirical method was proposed in order to estimate power losses in ferrite materials in the case of non-sinusoidal waveform excitation.[6] The modified Steinmetz equation was used to predict core losses of Finemet and Metglas tape under non-sinusoidal and DC-Biased waveforms.[7]. The core losses of SMC material under PWM and SVPWM were measured and discussed
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