Microstructure design and analysis of rotor and stator in three-phase permanent magnet brushless direct current electric motor with low rare earth material

2014 ◽  
Vol 18 (sup3) ◽  
pp. S3-46-S3-52
Author(s):  
H.-C. Yu ◽  
B.-S. Yu
Keyword(s):  
Rare Earth ◽  
Permanent Magnet ◽  
Direct Current ◽  
Electric Motor ◽  
Microstructure Design ◽  
Earth Material ◽  
Three Phase

scholarly journals Design of a three phase four quadrant variable speed drive for permanent magnet brushless DC motors

2016 ◽  
Author(s):  
◽  
Jonas-Yelee Dakora
Keyword(s):  
Permanent Magnet ◽  
Direct Current ◽  
Dc Motor ◽  
Bldc Motor ◽  
Variable Speed ◽  
Suitable Alternative ◽  
Variable Speed Drive ◽  
Three Phase ◽  
Electric Bicycle ◽  
Four Quadrant

The aim of this research project is to design a three phase four quadrant variable speed drive (VSD) for a permanent magnet brushless direct current motor (PMBLDC) that can be applied to an electric bicycle (e-bike). The design is confined to PMBLDC motors with a maximum power rating of 1.5kW. The speed controller operates in current mode at a maximum voltage and current rating of 50V and 30A, respectively. The VSD has the ability to smoothly control the current delivered to the DC motor and therefore controls its torque. The motor’s current is limited in all four quadrants of operation, and its speed is limited in the forward and reverse directions. The performance of the proposed DC motor VSD system is tested on an electric- bicycle. The PMBLDC motor has three hall sensors embedded into the stator to determine rotor position. A phase switcher module interprets the position signals and produces a switching pattern. This effectively transforms the BLDC motor into a direct current (DC) brushed motor. The unipolar switching scheme used ensures that current flows out of the battery only for motoring operation and into the battery during regenerative braking. The current and torque are directly proportional in a BLDC motor. Torque control is achieved in the BLDC motor using a single channel current controller. The phase switcher current is monitored and used to control the duty cycle of the synchronous converter switches. The proposed e-bike speed control system provides efficient control in all four quadrants of operation and it is a suitable alternative for a low cost transportation mode.

Microstructure Design of Surface Permanent Magnet and Tooth Surface Stator in Brushless DC Motor with Low Rare Earth Material

2013 ◽  
Vol 479-480 ◽  
pp. 427-430
Author(s):  
Hsing Cheng Yu ◽  
Bo Syun Yu
Keyword(s):  
Rare Earth ◽  
Magnetic Flux ◽  
Permanent Magnet ◽  
Permanent Magnets ◽  
Structure Design ◽  
Tooth Surface ◽  
Magnetic Flux Density ◽  
Cogging Torque ◽  
Brushless Dc ◽  
Earth Material

Permanent magnet (PM) brushless DC motors (BLDCMs) are widely applied in industrial drives. However, the price rising of rare earth resource resulted in country policy restriction, so it is detrimental for mass production of PM-BLDCMs. As a result, the design and manufacture tendency of PM-BLDCMs are smaller and slighter in adopting rare earth materials of PMs. Additional, the magnetic flux density of PMs are difficult to improve in the near future. The effective method is to decrease stator reluctance and to adjust magnetic flux distribution of the air gap in stator design. Hence, the surface permanent magnets (SPMs) and tooth surface stators (TSSs) are designed to improve the motor performance, and are calculated by finite-element analysis (FEA) software in this study. Various hemicycle groove microstructures of SPMs and TSSs for designing, analyzing and optimizing are considered to observe the magnetic field strength distribution and to reduce the cogging torque in PM-BLDCMs, and the FEA result can be regarded as important references of motor structure design. The cogging torque can be reduced 80.9% in SPM3-model and can be decayed 89.2% in TSS2-model versus original model separately, and the cogging torque of the optimal combination of SPM-BLDCM can be abated 62.4%. Furthermore, the usage amount of rare earth material volume in designed SPM-BLDCMs can be reduced 5.3% in average. Finally, a prototype of the SPM- BLDCM has been constructed to prove the simulation design.

scholarly journals INCREASE IN THE ELECTROMAGNETIC MOMENT OF A SUPERMINIATURE ELECTRIC MOTOR EXCITED BY RARE EARTH PERMANENT MAGNETS

2021 ◽  
pp. 111-121
Author(s):  
Roman A. Romanov ◽  
Tatyana V. Myasnikova ◽  
Alexey N. Matyunin
Keyword(s):  
Rare Earth ◽  
Permanent Magnet ◽  
Edge Effects ◽  
Electric Motor ◽  
Permanent Magnets ◽  
Electric Machines ◽  
The Body ◽  
Excitation System ◽  
Electromagnetic Moment ◽  
Fiber Technology

The article is devoted to improving the energy and performance characteristics of superminiature electric motors, which are widely used in modern devices of robotics and mechanotronics. With the development of digital and Autonomous robotic systems, the tasks of improving the efficiency of Executive micromechanisms that affect the functionality and duration of work in offline mode have become particularly relevant. Traditional design and technological solutions used in higher-power electric machines are not scalable to the field of superminiature electric machines. Domestic and foreign developers offer various design options and manufacturing technologies. The key design feature of the electric motor under consideration is a glass stator made by polycapillary fiber technology and an excitation system from rare-earth permanent magnets. In the wall of the glass case, holes are evenly distributed around the circumference, in which the control winding is laid. The motor excitation system is a two-pole permanent magnet located on the rotating rotor shaft. The purpose of the research is to determine the effect of changing the design of the excitation system by changing the location of the magnetic poles. The research uses software that simulates the electromagnetic field using the finite element method. In the course of research, it was found that a decrease in the body of a permanent magnet leads to a decrease in the electromagnetic moment, which is not compensated by a decrease in edge effects at the boundary of the poles of the magnet. However, an increase in the value of the maximum magnetic induction in the air gap allows us to conclude that edge effects at the pole boundary have a significant effect on reducing the energy characteristics of superminiature micromachines. Thus, the solutions proposed in this paper are not sufficient to increase the efficiency of the engine, but the data obtained indicate the need to reduce the edge effects of permanent magnets.

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