Abstract
In this paper, the design process of brushless DC (BLDC) motor adopting the dual rotor structure that can reduce the overall size of the motor while generating the same torque as the conventional permanent magnet BLDC motor is analyzed. A simple size is selected by obtaining the torque per rotor volume (TRV), and a method of matching the counter electromotive force by selecting the pole-arc of the magnet through a magnetic equivalent circuit is analyzed. Since the efficiency is low because the 120-degree commutation method is selected, the middle stator is optimized through detailed design through the experimental design method. Afterwards, it has the advantage of being able to shift without stopping due to the characteristic of a dual rotor. For this, an analysis of the driving characteristics for each mode is performed.
Highlights
A permanent magnet brushless DC (PM BLDC) motor has many advantages, such as high weight-to-torque ratio, high efficiency, excellent control characteristics, and high power density, so it has replaced the existing DC motor in many fields
BLDC motors are designed in an internal rotor type, an external rotor type, and a disk type
The dual rotor type proposed in this paper is capable of shifting without stopping because there are rotors on the outside and inside
Summary
A permanent magnet brushless DC (PM BLDC) motor has many advantages, such as high weight-to-torque ratio, high efficiency, excellent control characteristics, and high power density, so it has replaced the existing DC motor in many fields. BLDC motors are designed in an internal rotor type, an external rotor type, and a disk type. The time and energy required to stop and start the motor are generated as losses. When considering a variable speed application, it can be intuitively understood that this phenomenon acts as a loss. The dual rotor type proposed in this paper is capable of shifting without stopping because there are rotors on the outside and inside. It is possible to change the maximum driving speed according to the driving mode [1,2,3]
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