Influence of asymmetrical stator axes on the electromagnetic field and driving characteristics of canned induction motor

An, Yi; Zhang, Zhiheng; Li, Ming; Wang, Guangyu; Kong, Xiangling; Zaihang, Liu

doi:10.1049/iet-epa.2019.0060

Cited by 9 publications

(6 citation statements)

References 23 publications

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“…Studies [13] showed that these parameters were higher for larger-capacity CMs. A 1.9 kW CM was, for instance, shown to have a locked rotor torque that was 92.2%, that of a same-sized IM [14]. Figure 4 shows typical NEMA design letter A or B torque-speed curves for an IM and the relative curve for a similar-sized CM, i.e., CM with lower LRT and BDT values.…”

Section: Motor Torque Characteristicsmentioning

confidence: 99%

Acceleration Analysis of Canned Motors for SMR Coolant Pumps

2023

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An SMR (small modular reactor) is expected to be able to operate flexibly in conjunction with a high renewable energy penetration grid as a result of improved safety and easy power control compared to large nuclear power plants. SMRs, such as South Korea’s System-integrated Modular Advanced ReacTor (SMART), are designed to use canned motors (CMs) for their reactor coolant pumps (RCPs) to enhance their safety. CMs passively enhance the reactor’s safety by preventing the leakage of radioactive reactor coolant. However, with motor sizes designed to be as small as possible, and the increased air gap of CMs between the stator and rotor, the starting torque may be insufficiently low compared to that of similar-sized induction motors (IMs). Thus, CMs may require variable frequency drives (VFDs) to start. This paper compares the torque characteristics of CMs with those of IMs for SMART’s RCPs. ETAP is then used to perform a motor-starting analysis for CMs activated with and without VFDs. The results are presented and analyzed to find out if VFDs can deal with the CM starting torque issue.

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Section: Motor Torque Characteristicsmentioning

confidence: 99%

Acceleration Analysis of Canned Motors for SMR Coolant Pumps

2023

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“…To simplify the calculation, the electromagnetic field of the motor does not take into account the influence of the displacement current. The control equation and boundary condition of the transient electromagnetic field model are as follows [20]:

(}, \begin{matrix} 1em4pt \\ \frac{\partial}{\partial x} (ν \frac{\partial {bold-italicA}_{Z}}{\partial x}) + \frac{\partial}{\partial y} ()(, ν \frac{\partial A_{Z}}{\partial y}) = - J_{Z} + σ \frac{\partial A_{Z}}{\partial t} \\ {(|, A_{Z})}_{Γ} = 0 \end{matrix})

where

A_{Z}

is the magnetic vector potential,

ν

is the reluctivity,

σ

is the conductivity,

J_{Z}

is the current density, and

normalΓ

is the outer boundary.…”

Section: Model Buildingmentioning

confidence: 99%

Section: Prototype Parameters and The Finite Element Analysis Modelmentioning

confidence: 99%

Effect of time‐harmonic current on the harmonic leakage inductance of fractional slot concentrated winding permanent magnet synchronous motor

Zhang

et al. 2020

IET Electric Power Applications

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Harmonic leakage inductance occupies a high proportion in the synchronous inductance of fractional slot concentrated winding permanent magnet synchronous motor (FSCW‐PMSM), and the synchronous inductance determines the operating performance of the motor. To calculate the harmonic leakage inductance and synchronous inductance of the FSCW‐PMSM fed by inverters, two‐dimensional finite element analysis and the analytical method are used to study the influence of time‐harmonic current on the harmonic leakage inductance of the three‐phase FSCW‐PMSM in this study, and the influence mechanism is revealed. The relationship between the time‐harmonic magnetic field and space harmonic magnetic field is obtained, and the harmonic leakage coefficient and the working harmonic coefficient with different slot‐pole combinations are investigated. The results show that the time‐harmonic current can reduce the harmonic leakage inductance and increase the magnetising inductance, but has little effect on the synchronous inductance under the unsaturated condition. A prototype was manufactured and tested to verify the accuracy of the analysis model. The research results provide beneficial help for the design of the three‐phase FSCW‐PMSM fed by inverters.

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“…Related to mechanical faults in the IM rolling bearing, massive approaches have been harnessed to diagnose rolling bearing failure, some techniques used are based on thermal analysis [17], vibration analysis [18], measurement and analysis of external magnetic field [19], sound-acoustic emission analysis [2], artificial intelligence analysis using various estimation methods [16].…”

Section: Introductionmentioning

confidence: 99%

Fault Diagnosis of Induction Motor Using D-Q Simplified Model and Parity Equations

et al. 2022

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Induction motors are the horsepower in the industrial environment, and among them, 3-phase induction motors (3PIMs) stand out for their robustness and standard 3-phase power supply. In the literature, there are many approaches to diagnose faults for the nonlinear 3PIM model, and the vast majority focus on a single motor fault, although others address more faults but at the cost of greater computational complexity. In this sense, one of the methods with less computational load and early detection is the parity equation approach, which is based on analyzing the discrepancy between the input and output signals of a real process and a linear mathematical model to generate a residual signal, which contains important information about the fault and is obtained through a suitable selection of a weighting matrix W to isolate the faults as much as possible. The problem in this case study is that the 3PIM model is a nonlinear system. In this work, the fault detection method based on the parity equations approach applied in the 3PIM is explored using a simplified and proposed model of the 3PIM working in the D-Q synchronous reference frame, which is matched with the direct current motor model to guarantee both the existence of the parity space and to ensure a large set of detectable faults in the 3PIM parameters. Simulation and experimental results validate the proposed scheme and confirm a very simple set of residual equations to guarantee both early detection and a large set of detectable faults in: Stator and rotor resistances, stator and rotor inductances, as well as current, voltage, and speed sensors. Additionally, development of human machine interface (HMI) is implemented to validate the proposed scheme.

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Influence of asymmetrical stator axes on the electromagnetic field and driving characteristics of canned induction motor

Cited by 9 publications

References 23 publications

Acceleration Analysis of Canned Motors for SMR Coolant Pumps

Acceleration Analysis of Canned Motors for SMR Coolant Pumps

Effect of time‐harmonic current on the harmonic leakage inductance of fractional slot concentrated winding permanent magnet synchronous motor

Fault Diagnosis of Induction Motor Using D-Q Simplified Model and Parity Equations

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