Reduction in the Cogging Torques in the DCEFSM Motor by Changing the Geometry of the Rotor Teeth

Bień, A.; Drabek, Tomasz; Kara, Dawid; Kołacz, Tomasz

doi:10.3390/en15072455

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…Z. Li minimized the cogging torque of the spherical motor by auxiliary slots [10]. A. Bień optimized the cogging torque of the Direct Current Excited Flux Switching Machine by changing the shape of the rotor teeth [11].…”

Section: Introductionmentioning

confidence: 99%

Minimization of Cogging Torque for V-Type IPMSM by the Asymmetric Auxiliary Slots on the Rotor

Wan

Yang

et al. 2022

IEEE Access

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The interaction between the permanent magnets and the armature teeth of the PMSM generates cogging torque. It causes vibration and noise. Therefore, this paper establishes the analytical formula of the cogging torque of the motor with auxiliary slots on the surface of the rotor. It shows that reasonable slots can weaken the cogging torque. But it's essential to determine whether the air-gap flux density harmonics will increase appreciably by slotting. A V-type IPMSM with 8-pole, 48-slot is modeled to analyze the cogging torque. Two new rotor slot shapes-inwardly biased slots and outwardly biased slots-are proposed and researched to reduce the cogging torque of the V-type IPMSM. And they are compared with the traditional symmetrical auxiliary slots. Research shows that the inwardly biased slots and the symmetric auxiliary slots can obtain a better effect on the cogging torque than the outwardly biased slots. By the symmetrical auxiliary slots, the cogging torque is weakened by 75.88%, but the torque ripple increases from 22.36% to 29.60%. By the inwardly biased slots, the cogging torque is weakened by 75.64%, and the torque ripple drops from 22.36% to 12.95%. The inwardly biased slots could successfully suppress the torque ripple.INDEX TERMS Cogging torque, Interior V-type permanent magnet synchronous motor, Auxiliary slots.

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Section: Introductionmentioning

confidence: 99%

Minimization of Cogging Torque for V-Type IPMSM by the Asymmetric Auxiliary Slots on the Rotor

Wan

Yang

et al. 2022

IEEE Access

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show abstract

“…When the rotor is eccentric, the slot harmonic will also affect the magnetic pull force [8]. It is also necessary to optimize the stator and rotor slot number and slot dimensions of the motor within its design stage [9]. Fractional slot [10], closed-slot [11], skewed slot [12] and assisting magnetic pole [13] are all feasible methods for reducing slot harmonics, but the above methods cannot completely eliminate tooth harmonics.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Online Extraction Method of Slot Harmonics for Multiphase Induction Motor

2022

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The accurate extraction and analysis of slot harmonics caused by slotting in an induction motor are important for the motor’s performance evaluation and state monitoring. However, the frequency distribution of rotor slot harmonics (RSHs) varies along with the operating states of the motor, such as motor speed and slip ratio, and the voltage and current signals of the motor only contain small-amplitude RSHs compared with other harmonics; both make it difficult to extract and analyze the RSHs accurately online. While offline extraction and filters with constant parameters are mainly utilized in available works, a novel adaptive extraction method for RSHs in a multiphase induction motor is proposed here to realize online RSH extraction under different speed and load conditions. In this paper, the RSHs in the multiphase induction motors are firstly modeled by using the magnetic potential permeability method, and the influence of a skewed rotor on RSHs is analyzed through a multisection method. Then, an adaptive extraction method of RSHs is proposed, which can effectively realize the online processing of RSHs of stator current. Finally, the experimental platform of a nine-phase induction motor has been used to verify the effectiveness of the proposed method under different speeds and load conditions, with a relative error of less than 1% in identifying the RSH frequency distribution.

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Effects of magnet shapes on total harmonic distortion and cogging torque in a permanent magnet synchronous generator for wind turbines

Kurt,

Dalcalı

2023

Clean Energy

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This paper explores and theoretically reports the effects of different magnet structures on the cogging torque and the total harmonic distortion of the output waveforms from a permanent magnet generator. The generator is a radial flux machine and four different structures are considered for the magnet arrangement in the rotor component and modelled in the Ansys/Maxwell electromagnetic simulation program. This three-phase machine exhibits different behaviours towards various magnet structures, i.e. rectangular, inclined slotted rectangular, skewed double rectangular and inclined slotted skewed double rectangular, respectively. It has been proven by finite element analysis and Fourier analysis that both the cogging and total harmonic distortion values vary significantly for all models. The cogging torque values change in the range of 89.95 to 436.75 mNm and the lowest cogging torque is measured for the inclined slotted skewed double rectangular magnet geometry, while the conventional rectangular magnet geometry yields the worst value with 436.75 mNm. Furthermore, the total harmonic distortion values varies between 1.63 and 3.55 for different magnetic orientations. While the worst total harmonic distortion value is obtained from the inclined slotted rectangular magnet, the best total harmonic distortion is acquired from the skewed double rectangular magnet. All these results will provide scientists and engineers with important information in order to obtain more efficient machines.

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Reduction in the Cogging Torques in the DCEFSM Motor by Changing the Geometry of the Rotor Teeth

Cited by 3 publications

References 21 publications

Minimization of Cogging Torque for V-Type IPMSM by the Asymmetric Auxiliary Slots on the Rotor

Minimization of Cogging Torque for V-Type IPMSM by the Asymmetric Auxiliary Slots on the Rotor

Adaptive Online Extraction Method of Slot Harmonics for Multiphase Induction Motor

Effects of magnet shapes on total harmonic distortion and cogging torque in a permanent magnet synchronous generator for wind turbines

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