A method of reducing the cogging torque in a flux–torque regulation hybrid excitation machine with axial–radial magnetic circuit
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Cogging torque
This paper establishes a mathematical model to fast compute the cogging torque in permanent magnet brushless DC (BLDC) motor. A novel rotor structure is presented to reduce the cogging torque effectively, and the computing waveforms of cogging torque are drawn. The validity of this technique is proved by the comparison of cogging torque for many cases with and without split skewed rotor.
Cogging torque
Torque motor
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This paper presents the determination of a numerical indicator that allows the quick comparison of the cogging torque in permanent magnet synchronous machines (PMSMs) with both segmented stator and conventional stator structures, considering different pole/slot combinations. By means of two-dimensional finite element simulations of 18 different machine designs, it was proven that comparison indicators used for conventional PMSMs cannot be implemented for PMSMs with segmented stator core. Instead, the proposed indicator considers the change of periodicity in PMSMs with segmented stator core and enables two relevant phases of the design stage of the PMSMs: the effective comparison of the magnitude of the torque cogging for different pole/slot combinations on segmented machines; and the comparison between PMSMs with conventional stator and segmented stator.
Cogging torque
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This paper presents a method of reducing cogging torque of Permanent Magnet Synchronous Motor (PMSM) based on Finite Element Method (FEM). Cogging torque can be reduced by pole and slot number combination and the length of air gap reasonably. An investigation into the cogging torque in 4 pole, 48 slot and 6 pole, 54 slot interior-magnet machines with overlapping winding is described. The calculation results show that cogging torque can be reduced by nearly 50% by pole and slot number combination reasonably. Then influence of different length of air gap on cogging torque is also researched. Cogging torque can be weaken by increasing the length of air gap effectively, the smoothness of the motor running can be improved.
Cogging torque
Air gap (plumbing)
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Cogging torque is one of the sources which cause noise in a permanent magnet (PM) motor system. Conditions of producing a cogging torque are discussed in the paper and experiments were carried out on several samples, which proved that the analysis is correct in theory, and meaningful in practice.
Cogging torque
Permanent magnet motor
Harmonic Analysis
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Cogging torque
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In this paper, the design for an electromagnetic structure and reduction cogging torque of a dual stator structured radial flux permanent magnet generator, which is a combination of the inner- and outer-rotor types, has been proposed. We call this a dual stator radial flux permanent magnet generator. To reduce the cogging torque, firstly, stator tooth pairing was designed; secondly, stator displacement was designed and and finally, stator tooth pairing and stator displacement were carried out simultaneously. We found the optimal design condition about stator tooth pairing angle combination and stator displacement angle for cogging torque minimization. As a result, a cogging was reduced by 93.3[%] by this study.
Cogging torque
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This paper describes a novel estimation method of an instantaneous output torque and also describes a direct torque control method using the torque estimation method. The proposed method can estimate the torque in each stator tooth by using measured tooth flux density. By using the estimated each tooth torque, each tooth torque control is achieved. This paper confirms effectiveness of the proposed estimation method and the proposed control method by the coupling simulation with FEA.
Damping torque
Stall torque
Torque motor
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This paper examines performance of a permanent magnet synchronous motor (PMSM) under various load torque conditions, when a flux weakening control strategy is imposed on the motor. Flux weakening is implemented by employing a vector control technique. The technique is simulated with the flux weakening blocks added to it. Torque and speed measurements are recorded. The performance of PMSM during different load torque conditions is analyzed as well.
Synchronous motor
Torque motor
Stall torque
Damping torque
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In this research, novel small permanent magnet generator is proposed. The influence of the structural parameter on various characteristics is analyzed by using a finite element method. The suitable structure for high power and low Cogging torque is examined. The low cogging torque characteristics by the optimization of the auxiliary pole shape can be achieved.
Cogging torque
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Abstract Cogging torque generated in permanent magnet machine effects to some undesirable vibration and noises. In order to minimize the cogging torque in permanent magnet is the most important issues recently. This paper investigated the influence of the value of height and length of slotting in magnet edge on the cogging torque reduction. For purpose of study the structure of 24 slot/10 pole of permanent magnet machines have been chosen. The 2-D finite element based on FEMM 4.2 software was implemented to compute the permanent magnet machine performance. Simulation results showed that by optimising the height and length of slotting in magnet edge can reduce the cogging torque of permanent magnet machine significantly. The most effective way by employing a-two step slotting with 2.5 mm of height and 0.7 mm of length of the slotting in magnet in the first step of slotting. In the second step of in magnet edge, the length of slotting has been assigned as much as 2.3 mm and the height of slotting was 0.588635 mm. By employing the FEMM, three of different magnet structures of permanent magnet machine were analysed. It was found that the cogging torque of permanent magnet machine proposed magnet structure as much as 99.7 % compared with the initial structure of the permanent magnet machine.
Cogging torque
Electropermanent magnet
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