Asymmetrical Magnets in Rotor Structure of a Permanent Magnet Brushless DC Motor for Cogging Torque Minimization

Anuja, T. A.; Doss, M. Arun Noyal

doi:10.1007/s42835-021-00991-3

Cited by 9 publications

(4 citation statements)

References 27 publications

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“…Reducing the cogging torque is very important to improve the efficiency of electric motors [ 30 ], especially for the PM BLDC [ 31 ]. A detailed description of the cogging torque limitation methods can be found in the literature (e.g., References [ 32 , 33 , 34 , 35 ]). Unfortunately, with such a small size and the rotor in the form of a single magnet, some of these methods—for example, the use of an axial tilt of the rotor by certain discrete steps—are impractical or even not applicable.…”

Section: Resultsmentioning

confidence: 99%

Comparison of the Design of 3-Pole BLDC Actuators/Motors with a Rotor Based on a Single Permanent Magnet

Smółka

Firych‐Nowacka

2022

Sensors

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Permanent Magnet (PM) Brushless Direct Current (BLDC) actuators/motors have many advantages over conventional machines, including high efficiency, easy controllability over a wide range of operating speeds, etc. There are many prototypes for such motors; some of them have a very complicated construction, and this ensures their high efficiency. However, in the case of household appliances, the most important thing is simplicity, and, thus, the lowest price of the design and production. This article presents a comparison of computer models of different design solutions for a small PM BLDC motor that uses a rotor in the form of a single ferrite magnet. The analyses were performed by using the finite element method. This paper presents unique self-defined parts of basic PM BLDC actuators. With their help, various design solutions were compared with the PM BLDC motor used in household appliances. The authors proved that the reference device is the lightest one and has a lower cogging torque compared to other actuators, but also has a slightly lower driving torque.

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Section: Resultsmentioning

confidence: 99%

Comparison of the Design of 3-Pole BLDC Actuators/Motors with a Rotor Based on a Single Permanent Magnet

Smółka

Firych‐Nowacka

2022

Sensors

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“…Bhuvaneswari et al selected a permanent magnet brushless DC motor with an axial magnetic fux type and designed a permanent magnet brushless DC motor applied to a ceiling fan to conserve power [13]. To reduce the cogging torque in the permanent magnet brushless DC motor, Anuja and Doss adopted asymmetric permanent magnets, which reduced the magnet locking between the stator and rotor [14]. Anuja and Ravikumar et al also used the fnite element analysis method and adjusted the rotor magnetic displacement to reduce the cogging torque in a permanent magnet brushless DC motor [15,16].…”

Section: Introductionmentioning

confidence: 99%

Design and Simulation Analysis of Stator Slots for Small Power Permanent Magnet Brushless DC Motors

Zhu

Mei

et al. 2023

International Transactions on Electrical Energy Systems

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With the development of power electronics technology, permanent magnet brushless DC motors have developed rapidly and are now widely used in electric vehicles, flywheel energy storage, rail transit, and other applications. The stator slot structure is one of the main factors affecting the performance of the motor. A low-power permanent magnet brushless DC motor was selected as the research object, and the finite element analysis method was used to study the effects of different slot and pole combinations and stator slot types on the cogging torque, reluctance torque, and back electromotive force of the permanent magnet brushless DC motor. The influence of the stator slot structure of the motor on the performance of the motor was analyzed, and the optimal slot-pole combination and stator slot type were determined. The results showed that the cogging torque of the 2-stage 24-slot motor was 14 mN·m, and the reluctance torque was 75 mN·m. The cogging torque and reluctance torque were the smallest, and the back electromotive force waveform was similar to a trapezoidal wave. The motor cogging torque of the pear-shaped round slot was the smallest, with a value of 460 mN·m, and the motor reluctance torque of the pear-shaped trapezoidal slot was the smallest, with a value of 1.2 N·m. The back electromotive force waveforms of the motors with four different stator slot types were similar.

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“…In [8], the effect of fractional slots per pole on the thrust of linear motors with unilateral structure and bilateral structure was studied, and the optimal slot pole number coordination was obtained. In [9], the optimization of the permanent magnet shape was also studied.…”

Section: Introductionmentioning

confidence: 99%

Thrust Fluctuation Optimization of Permanent Magnet Linear Motor Based on Composite Slot Wedge

Zhang,

Wang

2023

J. Phys.: Conf. Ser.

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In order to reduce the thrust fluctuation of the linear motor, combined with its structural characteristics, the method of embedding a magnetic slot wedge is adopted. Based on the design of a common slot wedge structure, the genetic algorithm is used to optimize the slot wedge size, select the best size of the slot wedge structure, and then carry out finite element analysis. The results show that the thrust fluctuation of the single-sided linear motor is reduced by 66.42%, and that of the double-sided linear motor is reduced by 61.23%, which effectively reduces the thrust fluctuation. It has certain practical application value.

show abstract

Asymmetrical Magnets in Rotor Structure of a Permanent Magnet Brushless DC Motor for Cogging Torque Minimization

Cited by 9 publications

References 27 publications

Comparison of the Design of 3-Pole BLDC Actuators/Motors with a Rotor Based on a Single Permanent Magnet

Comparison of the Design of 3-Pole BLDC Actuators/Motors with a Rotor Based on a Single Permanent Magnet

Design and Simulation Analysis of Stator Slots for Small Power Permanent Magnet Brushless DC Motors

Thrust Fluctuation Optimization of Permanent Magnet Linear Motor Based on Composite Slot Wedge

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