PWM Influence on the Iron Losses and Characteristics of a Slotless Permanent-Magnet Motor With SiFe and NiFe Stator Cores

Abstract

This paper investigates the influence of switching frequency and modulation index combined with welding on the iron losses in thin silicon-iron and nickel-iron lamination sheets of a small slotless permanent-magnet synchronous machine (PMSM). First, measurements are conducted on welded and nonwelded stator ring cores for switching frequencies between 1 and 20 kHz and modulation indexes of 0.4, 0.7, and 0.9, keeping constant fundamental flux density peak values. This is possible by changing the dc-link voltage of the inverter. The obtained measurement data are afterward used in finite-element method simulations to investigate the inverter influence on the performance of the PMSM.Index Terms-AC machines, iron alloys, loss measurement, machine design, magnetic materials, nickel-iron (NiFe), permanentmagnet machines, pulsewidth modulation (PWM), silicon-iron (SiFe).

Finite Element Method Investigation and Loss Estimation of a Permanent Magnet Synchronous Generator Feeding a Non-Linear Load

“…The converter provokes time harmonics in the stator current waveform and consequently losses are created on the generator [14,15,[17][18][19][20][21]. Moreover, the eddy current losses are separated into classical losses, that are the eddy currents induced in materials by an external alternating magnetic field, and excess losses that are result of the internal movement of domain walls between different magnetic domains [22][23][24][25]. Taking into account the above consideration, the total iron losses are the sum of hysteresis, classical eddy current and excess losses [22,26,27]: P fe = P h + P e + P a = fe k h fB α + fe k e f 2 B 2 + fe k a f 1.5 B 1.5 ,…”

Sliding Mean Value Subtraction-Based DC Drift Correction of B-H Curve for 3D-Printed Magnetic Materials

“…(1) The constant drift assumption [19][20][21] does not remain valid when the measurement time is extended. This is due to the presence of switching frequency-based noise in the digital data acquisition setup, which worsens the problem.…”

Measurement of magnetic hysteresis swelling-up with frequency: Impact on iron losses in electric machine sheets

“…Higher speed and so higher frequencies can be reached, leading to a large type of applications and reducing the size of actuators for the same power. The increase of frequencies induces a high iron losses growth [2]. Therefore, concerning electrical actuator design, the prediction of iron losses is essential, especially at high frequency levels.…”