Abstract
In this paper, a stator core shape design method is proposed for an improvement in the power density of a small surface-mounted permanent magnet (SPM) motor. In order to improve the power density of a motor, it is necessary to increase its torque or reduce its weight. However, when a stator core shape is miniaturized to reduce the weight of the motor, the winding regions in a motor frequently decrease. Our stator core shape design method improves the power density of a motor by reducing its weight without decreasing the torque and keeping the winding regions constant. Moreover, the core loss of a motor also decreases when using our method. A Bezier curve is used for the determination of a stator core shape. The finite element method in consideration of the vector magnetic properties is used to evaluate the core loss of the motor shaped by our method. As a result, the power density of an SPM motor is improved, and the core loss of the motor decreases.
Highlights
The development of an unmanned space probe has become very important for space exploration
A surface-mounted permanent magnet (SPM) motor that is used generally for a space probe was selected as a small motor for the development of a high power density motor
A stator core shape in a small SPM motor was investigated for improving power density [6]
Summary
The development of an unmanned space probe has become very important for space exploration. There have been investigations into the reduction of core loss of a motor, they have carried winding region is not securable, it is necessary to make the winding fill factor increase in orderout to the core loss reduction of a stator core by replacing a general steel sheet with nonconventional magnetic obtain the same value as the back electromotive force (EMF) of a motor with a previously stator core materials with low core [7,8,9,10].toHowever, the nonconventional materials are unsuitable shape. It is necessary to establish a stator the loss method reduction of keeps our small motor because our motor is driven by a three-phase sinusoidal corecore design that a winding region constant when improving the power density of a wave voltage but not pulse width modulation (PWM). A stator core shape design of a small SPM motor for low core loss, high power.
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