Nicolas Denis

Core Loss Reduction of an Interior Permanent-Magnet Synchronous Motor Using Amorphous Stator Core

The core losses of an interior permanent-magnet synchronous motor (PMSM) have been reduced by about 50% using an amorphous magnetic material (AMM) stator core instead of a nonoriented (NO) steel stator core. Numerical calculation and experimental tests data have been compared to evaluate the reliability of the results. The AMM stator core has been realized using the latest improvements in manufacturing technologies.

Core losses of an inverter-fed permanent magnet synchronous motor with an amorphous stator core under no-load

In this paper, an interior permanent magnet synchronous motor (IPMSM) with a stator core made of amorphous magnetic material (AMM) is presented. The IPMSM is driven by a voltage source three-phase inverter with classical pulse width modulation (PWM) control. The core losses under no-load condition are measured by experiment and compared to an equivalent IPMSM with a stator core made of NO steel. Under these conditions, the core losses are influenced by the stator, rotor and magnet shapes but also by the PWM carrier signal that implies a high frequency harmonic in the magnetic flux density. It is demonstrated that the AMM can reduce the core losses by about 56 %.

Core loss increase due to inverter carrier frequency in an interior permanent magnet synchronous motor

This paper investigates the core losses of an interior permanent magnet synchronous motor (IPMSM) under no-load condition. Two experimental tests have been carried out to observe the impact of the pulse-width modulation (PWM) inverter voltage supply on the core losses. The results show that the high frequency harmonic of the voltage supply is responsible for about 22% of the total core losses.

Impact of Material on the Iron Losses of a Reactor With an Air Gap

The iron losses of a reactor with an air gap are investigated and compared for three different magnetic materials, namely, grain-oriented material (GO230), high performance non-oriented Fe-Si metal (super E ST125), and nanocrystalline soft magnetic material (FINEMET FT-3M). The iron losses of the reactor are measured by the experiments for different voltage supply frequencies and amplitudes. The measured data are compared with the material iron losses that are calculated from the manufacturers material datasheets. It is concluded that the air gap is responsible for a large part of the increase between the reactor and material iron losses and that the FT-3M has sensibly higher building factor compared with the other materials.

Attempt to Evaluate the Building Factor of a Stator Core in Inverter-Fed Permanent Magnet Synchronous Motor

This paper presents an attempt to evaluate the building factor of a stator core made of nonoriented silicon steel laminations. The stator core is used in a synchronous motor with buried permanent magnets driven by a voltage source three-phase inverter with classical pulse-width modulation (PWM) control. The building factor is the ratio between the iron loss density in the stator core and the specific iron loss density of the material. It then gives an evaluation of the impact of the core manufacture and the motor geometrical configuration on the stator iron losses. A first experiment is conducted to measure the iron losses of the inverter-fed motor in no-load condition. The material-specific iron losses are then evaluated by trying to apply similar magnetic flux density conditions in a wound laminated ring. The results show a decrease of the building factor with the PWM carrier frequency.

Core loss reduction of an interior permanent magnet synchronous motor using amorphous stator core

The core losses of an interior permanent magnet synchronous motor have been reduced by about 38 % by using an amorphous magnetic material stator core instead of a non-oriented steel stator core. Numerical calculation and experimental tests data have been compared to evaluate the reliability of the results. The amorphous magnetic material stator core has been realized using the latest improvements in manufacturing technologies.

Iron Loss Reduction in Permanent Magnet Synchronous Motor by Using Stator Core Made of Nanocrystalline Magnetic Material

This paper presents the results of experimental trials carried out on a permanent magnet synchronous motor (PMSM) that uses a stator core made of a nanocrystalline magnetic material (FINEMET). It is demonstrated that the manufactured stator can reduce the PMSM total iron loss by 64% to 75% compared with an equivalent motor using a stator made of conventional non-oriented silicon steel. The experimental results are confirmed by 2-D finite-element analysis.

Study of the effect of load torque on the iron losses of permanent magnet motors by finite element analysis

The output torque of an interior permanent magnet synchronous motor (IPMSM) can be controlled within its allowable range using a pulse-width modulation (PWM) inverter. In this paper, the effect of the load torque on the iron losses of an IPMSM is studied by investigating three driving conditions, namely no-current, no-load and load conditions. The experimental data demonstrates that a torque increase from 0 N·m to 1 N·m causes an iron loss increase of about 20 %. Three-dimensional (3D) finite element analysis (FEA) is performed and demonstrates that the magnet eddy current losses are the most affected by the torque increase.

Iron loss comparison between reactor with air gap and material

Laminated cores are widely used in many electrical applications such as transformers, reactors or electrical machines . They are responsible for iron losses, which depend mainly on the magnetic material itself, the core shape and the working conditions such as frequency and magnetic flux density . Materials with better magnetic properties than those of conventional electrical steel have been investigated . Grain-oriented (GO) steel is an anisotropic magnetic material that has been used to improve electrical machines [1] and reactors efficiency [2] . Amorphous materials offer good magnetic properties but have high brittleness and are difficult to manufacture . However, they have been used to reduce iron losses in transformers [3] and electrical motors [4] . Moreover, Gao et al. have shown the importance of the core shape for the loss reduction of a reactor [5] and Tera et al. investigated the influence of the air gap on the iron losses of an inductor [6] . In this paper, three different materials, namely grain-oriented material (GO230), high performance non-oriented Fe-Si metal (super E ST125) and nanocrystalline soft magnetic material (FINEMET FT-3M), are investigated for the loss reduction of a reactor . It is shown that the material has little influence on the total reactor iron losses.