Relation of joining parameters of stator core production and iron loss

2017 ◽  
Author(s):  
M. Schneider ◽  
N. Urban ◽  
J. Franke
Keyword(s):  
Iron Loss ◽  
Stator Core ◽  
Core Production

scholarly journals Analytical Iron Loss Evaluation in the Stator Yoke of Slotless Surface-Mounted PM Machines

2021 ◽  
Author(s):  
Matteo Leandro ◽  
Nada Elloumi ◽  
Alberto Tessarolo ◽  
Jonas Kristiansen Nøland
Keyword(s):  
Core Loss ◽  
Lookup Table ◽  
Iron Loss ◽  
Estimation Methods ◽  
Design Stage ◽  
Loss Assessment ◽  
Stator Core ◽  
Element Analysis ◽  
Field Solution ◽  
Loss Models

<div>One of the attractive benefits of slotless machines is low losses at high speeds, which could be emphasized by a careful stator core loss assessment, potentially available already at the pre-design stage. Unfortunately, mainstream iron loss estimation methods are typically implemented in the finite element analysis (FEA) environment with a constant-coefficients dummy model, leading to weak extrapolations with huge errors. In this paper, an analytical method for iron loss prediction in the stator core of slotless PM machines is derived. It is based on the extension of the 2-D field solution over the entire machine geometry. Then, the analytical solution is combined with variable- or constant-coefficient loss models (i.e., VARCO or CCM), which can be efficiently computed by vectorized post-processing. VARCO loss models are shown to be preferred at a general level.Moreover, the paper proposes a lookup-table-based (LUT) solution as an alternative approach. The main contribution lies in the numerical link between the analytical field solution and the iron loss estimate, with the aid of a code implementation of the proposed methodology. First, the models are compared against a sufficiently dense dataset available from laminations manufacturer for validation purposes. Then, all the methods are compared for the slotless machine case. Finally, the models are applied to a real case study and validated experimentally.</div>

Reduction of Iron Loss in Stator Core using an Optimum Pulse Pattern for High-Speed IPMSM

2021 ◽  
Vol 141 (4) ◽  
pp. 313-323
Author(s):  
Takahiro Kumagai ◽  
Takeshi Ito ◽  
Kodai Nishikawa ◽  
Jun-ichi Itoh ◽  
Kazuki Yamane ◽  
...  
Keyword(s):  
High Speed ◽  
Iron Loss ◽  
Stator Core ◽  
Reduction Of Iron

Building Factor Evaluation of the Stator Core Made of Ultrathin Electrical Steel Sheet for the High-Speed Motor

2018 ◽  
Vol 915 ◽  
pp. 9-15 ◽  
Author(s):  
Mohachiro Oka ◽  
Masato Enokizono ◽  
Yuji Mori ◽  
Kazumasa Yamazaki
Keyword(s):  
Evaluation System ◽  
High Speed ◽  
Steel Sheet ◽  
Electrical Steel ◽  
Excitation Frequency ◽  
Iron Loss ◽  
Stator Core ◽  
Factor Evaluation ◽  
Electrical Steel Sheet ◽  
Excitation Method

We are developing a low-loss stator core for high-speed and small-size motors using an ultrathin electrical steel sheet. This stator core for a high-speed motor was produced using a 0.08mm-thick ultrathin electrical steel sheet. Additionally, in order to evaluate the iron loss of the high-speed motor stator core, we constructed a high-speed building factor evaluation system. This evaluation system is composed of high-speed A/D converters, a D/A converter, and a high-speed power amplifier. TheB-Hcurve and the iron loss of the high-speed motor stator core (0.08mm_Core), which was made of the 0.08mm-thick ultrathin electrical steel sheet, were measured using the outer excitation method and the high-speed building factor evaluation system. The iron loss of the 0.08mm_Core was about 66% of the iron loss of the ordinary-speed motor stator core (the 0.35mm_Core) which was made of a 0.35mm-thick electrical steel sheet. Each iron loss in two kinds of cores was measured using the outer excitation method at the excitation frequency (fex) 1000Hz and the maximum excitation magnetic flux density (Bexmax) 1.0T. From experimental results, the iron loss of the 0.08mm_Core in the high frequency excitation was very small.

scholarly journals Evaluation of frame-induced compressive stress on the magnetic properties of stator cores using the excitation inner core method

2018 ◽  
Vol 69 (6) ◽  
pp. 477-480
Author(s):  
Mohachiro Oka ◽  
Masato Enokizono
Keyword(s):  
Magnetic Properties ◽  
Compressive Stress ◽  
Inner Core ◽  
Iron Loss ◽  
Electric Motors ◽  
Stator Core ◽  
Core Method

Abstract To improve the efficiency of electric motors, we developed the excitation inner core method to evaluate the magnetic properties such as the iron loss of the actual stator core. After preparing two stator cores with a frame, we examined the frames influence of compressive stress by applying the standard and small excitation inner core methods to evaluate the iron loss of both stator cores having a frame. After removing the frames of the two stator cores, we evaluated the iron loss of two stator cores without the frames again by applying both methods.

scholarly journals Magnetic properties of silicon steel sheet core with different processing stress

2018 ◽  
Vol 207 ◽  
pp. 03017
Author(s):  
Toshiki Matsui ◽  
Kyyoul Yun
Keyword(s):  
Magnetic Properties ◽  
Steel Sheet ◽  
Silicon Steel ◽  
Iron Loss ◽  
Stator Core ◽  
Steel Sheets ◽  
Shrink Fitting ◽  
Wire Cutting ◽  
Rotor Core ◽  
Processing Stress

The motor core including a rotor core and a stator core, which is made from silicon steel sheets. Iron loss increases during fixation of the stator core, e.g., by interlocking, welding, and shrink fitting installation. In this paper, the magnetic properties changes by each processing such as wire cutting, punching, interlocking and shrink fitting are investigated. Iron loss of the toroidal cores using punching, interlocking and shrink fitting are increased from 1.16 W/kg to 1.56 W/kg (34.4 % increased) at 50Hz, and from 21.1 W/kg to 27.5 W/kg (30.3 % increased) at 400 Hz compared with iron loss of wire cut toroidal core.

Evaluation of the Iron Loss of the Actual Stator Core to Achieve High Efficiency of the Rotating Machine

2010 ◽  
Vol 670 ◽  
pp. 447-454 ◽  
Author(s):  
Mohachiro Oka ◽  
Tugunori Kanada ◽  
Takayuki Kai ◽  
Masato Enokizono
Keyword(s):  
Manufacturing Process ◽  
Path Length ◽  
High Efficiency ◽  
Inner Core ◽  
Complex Configuration ◽  
Iron Loss ◽  
Stator Core ◽  
Rotating Machine ◽  
Iron Losses ◽  
Before And After

In this paper, the iron loss of an actual stator core of the complex configuration was evaluated by using the proposed effective magnetic path length and the excitation inner core, which were developed in this research. The iron loss of an actual stator core in the manufacturing process was described. Iron losses of actual stator cores before and after the varnish processing were measured using the excitation inner core of several kinds of shapes. As a result, iron losses of actual stator cores evaluated using the proposed effective magnetic path length were within appropriate values.

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