Suppression of Torque Ripple Caused by Misalignment of the Gearbox by Using Harmonic Current Injection Method

Park, Soo-Hwan; Park, Jincheol; Hwang, Sung-Woo; Kim, Jae-Hyun; Park, Hyeon-Jin; Lim, Myung-Seop

doi:10.1109/tmech.2020.2999379

Cited by 14 publications

(7 citation statements)

References 18 publications

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“…However, cogging torque and torque ripple of motors increase due to rotor eccentricity. Rotor eccentricity is frequently generated for various reasons, such as the assembly tolerances of bearings or housings, defects in bearings, and the manufacturing process of the motor [3][4][5][6][7][8]. Rotor eccentricity is classified into static eccentricity (SE) and dynamic eccentricity (DE).…”

Section: Introductionmentioning

confidence: 99%

Diagnosis and Robust Design Optimization of SPMSM Considering Back EMF and Cogging Torque due to Static Eccentricity

Park

Kim

et al. 2021

Energies

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Static eccentricity (SE) is frequently generated by manufacturing processes. As the nonuniformity of the air-gap length is caused by the SE, the torque ripple and cogging torque increase in the motor. This study analyzes the distorted back electromotive force (EMF) and cogging torque due to SE. Further, a motor design considering SE is performed for stable back EMF and low cogging torque. First, the SE was diagnosed and analyzed using the back EMF and cogging torque measured from the test results of the base model. In addition, the rotor position was calculated using the unbalanced back EMF due to the SE. The calculated rotor position is used when analyzing phenomena due to SE and applied to robust design. Subsequently, robust design optimization was performed to improve the unbalanced back EMF and cogging torque due to SE. Using finite element analysis (FEA) considering SE, the shape of the stator was designed based on the base model. The estimated rotor position from the base model was applied to the optimum model to confirm its robustness from SE’s effects. Finally, the base and optimum models were compared through the test results.

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Section: Introductionmentioning

confidence: 99%

Diagnosis and Robust Design Optimization of SPMSM Considering Back EMF and Cogging Torque due to Static Eccentricity

Park

Kim

et al. 2021

Energies

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“…Under the effect of the cogging effect and misalignments, the electromagnetic torque of the motor and the eccentric torque change with the rotation of the shaft. e driving torque, which is defined as the sum of the electromagnetic torque of the motor and the eccentric torque, can be expressed as the sum of averaged torque and torque ripple [32].…”

Section: Relationships Between the Misaligned Fault And The Torque Ripplementioning

confidence: 99%

“…An instrument, designed by Dhaouadi and Ghorbel, is designed to be a vertical structure to ensure an excellent shaft misalignment [6][7][8]. However, the methods to reduce the shaft misalignment caused by the manufacturing tolerances incur high costs and require much effort [9]. Even if an accurate alignment is secured, it cannot be continued for a long duration due to many effects, such as thermal deformation and load imbalance [10,11].…”

Section: Introductionmentioning

confidence: 99%

Diagnosis of the Misaligned Faults of the Vertical Test Instrument of High‐Precision Industrial Robot Reducer

Zhang

2021

Shock and Vibration

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High-precision reducer is the core component of industrial robots. In order to achieve the comprehensive performance testing of precision reducers, an instrument with a vertical layout and a cylindrical structure is designed. As a rotating machine, the inevitable coupling misalignment of the instrument can lead to vibration faults which lead to errors in the test. So it is pretty necessary to diagnose and monitor the coupling misalignment while the instrument is working. The causes of the coupling misaligned fault of the instrument and the relationship between the misalignment fault and torque ripple are analyzed in this paper. A method of using the torque transducer in the measurement chain of the instrument to diagnose the coupling misalignment is proposed in this paper. Many experiments have been done to test the capability of detecting the coupling misalignment using this method. Experimental results show that the amplitude of torque ripple of the shaft is linearly related to the coupling misalignment and is quadratically related to the rotation speed of the shaft when the misalignment exists in the shaft. The combination of components at the rotation frequency (fr) and the additional components can be used to diagnose faults due to coupling misalignment.

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“…We call this part of the torque deviation "additional torque." erefore, the measurement results of the torque sensor on the instrument cannot be used as the reducer's actual input and output torque [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Design and Calibration of Torque Measurement System of Comprehensive Performance Test Instrument of Industrial Robot Reducer

Qiu

et al. 2022

Computational Intelligence and Neuroscience

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The measurement of input and output torque of a precision reducer, the core component of an industrial robot, plays a vital role in evaluating the robot's performance. The TMSIS and TMSOS of a vertical cylindrical high-precision reducer detector were designed and investigated in this study to realize the accurate measurement of input and output torque of the reducer. Because a transmission chain connects the torque transducer and the reducer, the characteristics of the inevitable additional torque are analyzed in detail. A torque calibration device is developed to realize the calibration of the torque measurement system. The readings of the torque calibration device are compared with the data of the instrument’s torque measurement system to realize the instrument's torque calibration. The improved particle swarm optimization and Levenberg–Marquardt algorithm-based radial basis function neural network is used to compensate for the error of the torque measurement system. The parameters of the RBF neural network are settled according to the characteristics of the additional torque and the torque calibration results. The experimental results show that the torque measurement accuracy of the torque measurement system can reach 0.1% FS after torque calibration and error compensation.

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Suppression of Torque Ripple Caused by Misalignment of the Gearbox by Using Harmonic Current Injection Method

Cited by 14 publications

References 18 publications

Diagnosis and Robust Design Optimization of SPMSM Considering Back EMF and Cogging Torque due to Static Eccentricity

Diagnosis and Robust Design Optimization of SPMSM Considering Back EMF and Cogging Torque due to Static Eccentricity

Diagnosis of the Misaligned Faults of the Vertical Test Instrument of High‐Precision Industrial Robot Reducer

Design and Calibration of Torque Measurement System of Comprehensive Performance Test Instrument of Industrial Robot Reducer

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