Abstract
The iron loss of industrial motors increases by residual stress during manufacturing processes. It is very important to make clear the distribution of the residual stress in the motor cores to reduce the iron loss in the motors. Barkhausen signals which occur on electrical steel sheets can be used for the evaluation of the residual stress because they are very sensitive to the material properties. Generally, a B-sensor is used to measure Barkhausen signals, however, we developed a new H-sensor to measure them and applied it into the stress evaluation. It is supposed that the Barkhausen signals by using a H-sensor can be much effective to the residual stress on the electrical steel sheets by referring our results regarding to the stress evaluations. We evaluated the tensile stress of the electrical steel sheets by measuring Barkhausen signals by using our developed H-sensor for high efficiency electrical motors.
Highlights
This paper presents the newly proposed stress evaluation by measuring Barkhausen signals with a magnetic field sensor
We focused on measuring Barkhausen signals by “H-coil type sensor” and under “controlled magnetic flux conditions” to realize it
We evaluated the tensile stress of the electrical steel sheets by measuring Barkhausen signals by using our developed H-sensor for high efficiency electrical motors in this paper
Summary
This paper presents the newly proposed stress evaluation by measuring Barkhausen signals with a magnetic field sensor. The annealing process has never been applied into the “industrial electrical motors” in Japan for these twenty or thirty years It means that the industrial electrical motors have been used with high iron loss for many years. High efficiency electrical motors.[8] In this paper, a stress evaluation method by measuring Barkhausen signals with a magnetic field sensor is newly proposed to make clear the local distribution of the residual stress on the electrical motor cores during manufacturing electrical motors to use the heating method effectively. The Barkhausen signals arise from magnetizing moments, and they are affected by the microscopic conditions such as crystal grain, dislocation and impurities This means that the Barkhausen signal are very sensitive to the stress conditions on magnetic materials including electrical steel sheets. We evaluated the tensile stress of the electrical steel sheets by measuring Barkhausen signals by using our developed H-sensor for high efficiency electrical motors in this paper
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