Calculation of transient temperature and rated capacity of three-phase induction motor under different working systems

2021 ◽  
pp. 1-13
Author(s):  
Yunyan Xia ◽  
Hao Du ◽  
Yuanliang Shao
Keyword(s):  
Output Power ◽  
Temperature Rise ◽  
Complex Loading ◽  
Motor Output ◽  
Transient Temperature ◽  
Load Duration ◽  
Temperature Field Model ◽  
Reasonable Evidence ◽  
Starting Process ◽  
The Relationship

This paper aims to propose a method to determine the temperature rise and rated capacity of induction motors under different working systems. A dynamic mathematical model, a 3D temperature field model, and finite element method are used to analyze the electromagnetic loss and transient temperature rise, respectively. The influence of the motor starting process on the temperature rise is taken into account, which resolves the complex loading of transient heat source. The maximum allowable running times for the motor operating with different overloads are determined. The relationship between the motor output power and the allowable running time is obtained, and it provides a basis to determine the rated capacity of motor under S2 working system. The relationship between the motor output power and the temperature rise under different load duration rates is also obtained and provides reasonable evidence to determine the rated capacity of the motor under S3-working system.

Power Feedward Strategy of Grid-Connected Inverter Based on Direct Power Decoupling

2013 ◽  
Vol 331 ◽  
pp. 311-314
Author(s):  
Chun Peng Fu ◽  
Yong Qiang Zhu
Keyword(s):  
Output Power ◽  
Mathematic Model ◽  
Direct Power ◽  
Loop Control ◽  
Grid Voltage ◽  
Voltage Change ◽  
Power Decoupling ◽  
Grid Connected Inverter ◽  
The Relationship ◽  
Power Response

Take into account grid inverter that using direct power control is vulnerable to the disturbance of grid voltage, a control algorithm is proposed based on the relationship between the power and voltage, which is deduced according to the mathematic model of the inverter that using double-loop control strategy. The change amount of the output power of inverter is added to the reference of power closed-loop as power feedforward, which improves the dynamic response to the grid voltage change. Simulations with EMTDC/PSCAD are carried out and the comparison of output power response to grid voltage change between control with and without power feedforward verifies its effectiveness.

scholarly journals Undergraduate Omani Students’ Identity and Perceptions of Parenting Styles

2016 ◽  
Vol 8 (2) ◽  
pp. 114 ◽  
Author(s):  
Said Aldhafri ◽  
Ibrahim Al-Harthy
Keyword(s):  
Undergraduate Students ◽  
Parenting Styles ◽  
Academic Identity ◽  
Identity Status ◽  
Future Research ◽  
Validity And Reliability ◽  
Identity Statuses ◽  
Reasonable Evidence ◽  
Explained Variance ◽  
The Relationship

<p>The current study examined the relationship between university students’ academic identity and their perceptions of their parents’ parenting styles among a sample of Omani students. Marcia’s (1993) academic identity statuses are adapted. These are moratorium, foreclosed, diffuse, and achievement. Parenting styles included authoritative, authoritarian, and permissive. The participants were 192 undergraduate students from Oman. The participants responded to Arabic versions of the Academic Identity Status (Was &amp; Isaacson, 2008) and the Parenting Authority Questionnaire (Buri, 1991). Both questionnaires showed reasonable evidence of validity and reliability. The findings show that parenting styles varied in their relationship with the four statuses of students’ academic identity. Using the three parenting styles as predictors in the regression models, the lowest percentage of explained variance among identity dimensions was found for moratorium, while the highest explained variance was found for diffusion. Implications and future research are discussed and presented by the end of the paper.</p>

Experimental Study on Adsorption of Gasoline Vapor on Activated Carbon at High Concentration

2013 ◽  
Vol 807-809 ◽  
pp. 549-552 ◽  
Author(s):  
Chen Lu Zhao ◽  
Wei Qiu Huang ◽  
Ying Xia Wang ◽  
Li Shi
Keyword(s):  
Temperature Rise ◽  
Activated Carbons ◽  
Thermodynamic Characteristics ◽  
High Concentration ◽  
Vapor Adsorption ◽  
Gasoline Vapor ◽  
Adsorption Capacities ◽  
Bed Temperature ◽  
Relationship Of ◽  
The Relationship

Dynamic and thermodynamic characteristics of gasoline vapor adsorption at 0.3 mol/mol on different activated carbons (ACs) were investigated. The adsorption capacities of AC1 and AC3 were 0.295 g/g and 0.189 g/g at 20 oC, and 0.284 g/g and 0.165 g/g at 30 °C, respectively. Bed temperature rise was up to 50°C to 60°C in the adsorption of gasoline vapor at 0.3 mol/mol.The heat effect formula for high concentration vapor adsorption was deduced to evaluate the relationship of the adsorption capacity of the activated carbons, the mole fraction of the inlet gasoline vapor, the recovery efficiency of the gasoline vapor with the temperature rise.

Study on the transient temperature distribution of new conical friction plate under sliding friction

2021 ◽  
pp. 095440702110696
Author(s):  
Yanzhong Wang ◽  
Peng Liu
Keyword(s):  
Temperature Distribution ◽  
Temperature Gradient ◽  
Temperature Rise ◽  
Friction Surface ◽  
Sliding Friction ◽  
Conical Surface ◽  
Transient Temperature ◽  
Radial Temperature Gradient ◽  
Radial Temperature ◽  
Friction Plate

Conical friction surface is a novel configuration for friction plate in transmission. Numerical FEA models for transient heat transfer and distribution of conically grooved friction plate have been established to investigate the thermal behavior of the conical surface with different configurations. The finite element method is used to obtain the numerical solution, the temperature test data of conical surface are obtained by the friction test rig. In order to study and compare the temperature behavior of conically grooved friction plate, several three-dimensional transient temperature models are established. The heat generated on the friction interface during the continuous sliding process is calculated. Two different pressure conditions were defined to evaluate the influence of different load conditions on temperature rise and the effects of conical configuration parameters on surface temperature distribution are investigated. The results show that the radial temperature gradient on conical friction surface is obvious. The uniform pressure condition could be used when evaluating the temperature rise of conically grooved friction plate. The increase of the cone height could improve the radial temperature gradient of the conically grooved friction plate.

scholarly journals A Frequency Locking Method for ICPT System Based on LCC/S Compensation Topology

Energies ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2626
Author(s):  
Yansong Li ◽  
Minhao Wang ◽  
Weiwei Zhang ◽  
Mengmeng Zhao ◽  
Jun Liu
Keyword(s):  
Output Power ◽  
Power Transmission ◽  
Transmission Efficiency ◽  
Maximum Efficiency ◽  
Initial Value ◽  
Frequency Locking ◽  
Inductively Coupled ◽  
Output Characteristics ◽  
The Relationship

Aiming to maximize the transmission efficiency of inductively coupled power transmission (ICPT) system with the designed output power, a frequency locking method for an ICPT system based on LCC/S compensation topology is proposed in this paper. Firstly, the relationship between compensation component Lf1 and output power was deduced by the lossless model, and the initial value of Lf1 was obtained. Then, considering the system loss, the designed output power and frequency were input into the frequency locking program, and Lf1 and other compensation parameters were dynamically tracked. At the same time, the transmission efficiency of the system was calculated, and the frequency that achieved maximum efficiency was automatically locked when the system met the requirements of the designed output power. Finally, based on the method, the output characteristics of the system were verified by experiments.

scholarly journals Photovoltaic Output Power Estimation and Baseline Prediction Approach for a Residential Distribution Network with Behind-the-Meter Systems

Forecasting ◽  
2020 ◽  
Vol 2 (4) ◽  
pp. 470-487
Author(s):  
Keda Pan ◽  
Changhong Xie ◽  
Chun Sing Lai ◽  
Dongxiao Wang ◽  
Loi Lei Lai
Keyword(s):  
Output Power ◽  
Least Squares Method ◽  
Distribution Network ◽  
Electricity Consumption ◽  
Power Estimation ◽  
Solar Irradiation ◽  
Residential Distribution ◽  
Net Load ◽  
Prediction Approach ◽  
The Relationship

Considering that most of the photovoltaic (PV) data are behind-the-meter (BTM), there is a great challenge to implement effective demand response projects and make a precise customer baseline (CBL) prediction. To solve the problem, this paper proposes a data-driven PV output power estimation approach using only net load data, temperature data, and solar irradiation data. We first obtain the relationship between delta actual load and delta temperature by calculating the delta net load from matching the net load of irradiation for an approximate day with the least squares method. Then we match and make a difference of the net load with similar electricity consumption behavior to establish the relationship between delta PV output power and delta irradiation. Finally, we get the PV output power and implement PV-load decoupling by modifying the relationship between delta PV and delta irradiation. The case studies verify the effectiveness of the approach and it provides an important reference to perform PV-load decoupling and CBL prediction in a residential distribution network with BTM PV systems.

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