Comparison of Current Transducer Characteristics according to Electrical Steel Magnetic Core Materials

Analysis and Compensation of Phase Shift Errors of an Open-Loop Current Transducer Considering Eddy Current

“…The magnetic core of the current transducer is composed of soft magnet material with high magnetic permeability. However, the magnetic nonlinearity of the core can introduce errors in the current transducer's measurements [10], [11]. Therefore, careful material selection is crucial, typically involving the lamination of thin steel plates to mitigate iron loss resulting from eddy currents.…”

“…Table I shows the characteristics of the magnetic core (35PN230) used. Where the iron loss is at 1.5 T and 50 Hz [10], [12].…”

“…Note that the amplitude error was 0.18% whereas the phase error was 3.5° when the frequency was 1.5 kHz as shown in Table II. Neglecting the amplitude error of ( 6), the motor currents can be transformed to the rotating reference frame such that 𝒊 𝒅𝒒 = 𝑒 𝑗𝜃 ℎ 𝒊̂𝒅 𝒒 = (cos 𝜃 ℎ 𝑖̂𝑑 − sin 𝜃 ℎ 𝑖̂𝑞) +𝑗(sin 𝜃 ℎ 𝑖̂𝑑 + cos 𝜃 ℎ 𝑖̂𝑞), (10) where 𝒊 𝒅𝒒 is the actual stator currents and 𝒊̂𝑑 𝑞 is the measured currents in the synchronous frame whose d-axis is aligned with the rotor flux. This means that the actual 𝑑𝑞-currents leads the measured currents by 𝜃 ℎ .…”

“…Fig.10shows the experimental environment configuration. Open-loop and fluxgate current transducer connected in series to the inverter output[5],[10].…”