Abstract
This study designed a detachable and standardized toroidal test frame to measure the electromagnetic characteristic of toroidal laminated silicon steel specimens. The purpose of the design was to provide the measurements with standardized and controlled environment. The device also can withstand high temperatures (25–300°C) for short time period to allow high temperature tests. The accompanying driving circuit facilitates testing for high frequency (50–5,000 Hz) and high magnetic flux (0.2–1.8 T) conditions and produces both sinusoidal and nonsinusoidal test waveforms. The thickness of the stacked laminated silicon-steel sheets must be 30~31 mm, with an internal diameter of 72 mm and an outer diameter of 90 mm. With the standardized setup, it is possible to carry out tests for toroidal specimen in high temperature and high flux operation. The test results show that there is a tendency of increased iron loss under high temperature operation. The test results with various driving waveforms also provide references to the required consideration in engineering designs.
Highlights
Recent development in electrical vehicle raised the demand on developing high efficiency motors
Since the electric motors relied on silicon steel to conduct the magnetic flux, it became important to minimize the iron loss associated with the motor operation, and iron loss measurement received renewed research interests
This paper referred to the ASTM A927/A927M-04 and related references [5,6,7,8,9] by self-designing a detachable standardized toroidal test frame for measuring the iron loss of toroidal laminated silicon-steel sheets and for isolating the winding tolerances for precise characteristic comparison among similar but different samples
Summary
Recent development in electrical vehicle raised the demand on developing high efficiency motors. The iron loss characteristics are inferior when the direction of the laminated silicon-steel sheet and its rolling direction are at an angle of 50–60∘ [2]. Takahashi et al [4] proposed a special ceramic frame for the test piece that could withstand high temperatures. To address these needs, this paper referred to the ASTM A927/A927M-04 and related references [5,6,7,8,9] by self-designing a detachable standardized toroidal test frame for measuring the iron loss of toroidal laminated silicon-steel sheets and for isolating the winding tolerances for precise characteristic comparison among similar but different samples.
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