scholarly journals Evaluation of the Magnetic Properties of the Actual Stator Core Using the Small Excitation Inner Core

2013 ◽  
Vol 21 (2) ◽  
pp. 116-121
Author(s):  
Mohachiro OKA ◽  
Takato OGASAWARA ◽  
Masato ENOKIZONO
Keyword(s):  
Magnetic Properties ◽  
Inner Core ◽  
Stator Core

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.

Development of Miniature Transducer-Type Magnetic Property Measurement for Motor Stator Core

2012 ◽  
Vol 721 ◽  
pp. 127-131
Author(s):  
Shoichiro Nagata ◽  
Yukihito Kido ◽  
Masato Enokizono
Keyword(s):  
Magnetic Properties ◽  
Magnetic Property ◽  
Measurement System ◽  
Experimental Results ◽  
Stator Core ◽  
Property Measurement ◽  
Transducer Type

In this paper, we present a new magnetic property measurement system. We developed a miniature transducer, with a 16-mm2 footprint, for measuring the local magnetic properties of a motor stator core. The construction of the transducer and measurement system is proposed, and experimental results show the validity of the measurements.

Evaluation of the Iron Loss Distribution of the Actual Stator Core Using Small Excitation Inner Cores

2012 ◽  
Vol 721 ◽  
pp. 90-95 ◽  
Author(s):  
Mohachiro Oka ◽  
Shimada Kazunori ◽  
Kawano Makoto ◽  
Masato Enokizono
Keyword(s):  
Inner Core ◽  
Complex Structure ◽  
Iron Loss ◽  
Manufacturing Processes ◽  
Stator Core ◽  
Loss Distribution ◽  
Rotating Machine ◽  
Iron Losses ◽  
Shrink Fitting ◽  
The Difference

To obtain the basic data to manufacture the highly effective rotating machine, the axial iron loss distribution of an actual stator core of the complex structure was evaluated by using the small excitation inner core. The laminated thickness of this small excitation inner core is approximately 1/6 of the thickness of the stator core. Therefore, the circumferential iron loss distribution of the stator core and the axial iron loss distribution of a stator core can be measured by using this small excitation inner core. Then, to compare the difference of the axial iron loss distribution in the stator core, we investigated the axial iron loss distribution in the actual stator core after two manufacturing processes, the laminating process and the shrink fitting process. The iron losses were measured in three places (the edge, the quarter part, and the center) of two stator cores. As a result of our investigation, the axial iron loss distribution in the actual stator core clearly changed. This paper reports on the axial iron loss distribution in two manufacturing processes in two actual stator cores measured by using the small excitation inner core.

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