A novel method to determine the motor efficiency under variable speed operations and partial load conditions

Li, Yunhua; Liu, Mingsheng; Lau, Josephine; Zhang, Bei

doi:10.1016/j.apenergy.2015.01.064

Cited by 59 publications

(31 citation statements)

References 8 publications

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“…References 15 investigated the effect of VFD on the performance of rotating machines by considering the power and efficiency issues. Similarly, References 16, 17 presented the motor performance and method for determining the efficiency based on the operational parameters, that is, load ratio and speed ratio. The reduction in the efficiency of VFD fed motor under variable loading has been investigated in References 17, 18 and methods for the improvement of the efficiency of VFD systems have been studied in Reference 19.…”

Section: Literature Review and Main Contributionmentioning

confidence: 99%

Optimum operation of low voltage variable‐frequency drives to improve the performance of heating, ventilation, and air conditioning chiller system

Hassan

Mahmood

Akmal

et al. 2020

Int Trans Electr Energ Syst

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Summary A tremendous increase in the industrial and commercial applications of low voltage variable frequency drives (VFD) has been observed in the last decade. VFD are mainly used for energy saving and reliable speed control of industrial motors in an electrical system. However, power quality issues are becoming more apparent due to the installation of VFD. In this paper, a nonintrusive technique has been employed to determine the optimum operation of VFD system for improving the performance of heating, ventilation, and air conditioning centrifugal chiller system. The effect of load and speed ratios of VFD systems on total harmonic distortion (THD), power factor, distortion loss ratio, temperature, and efficiency has been investigated. The measurement of these parameters has been carried out by performing a series of experiments under variable operating conditions. The binomial relations have been developed between the various performance parameters and the operating conditions. Based on experimental results, optimum operating conditions have been proposed and implemented for the VFD system. Moreover, the results have been compared with the existing operating conditions and indicate a considerable improvement in THD, power factor, distortion loss ratio, efficiency, and the annual cost of energy consumed.

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Section: Literature Review and Main Contributionmentioning

confidence: 99%

Optimum operation of low voltage variable‐frequency drives to improve the performance of heating, ventilation, and air conditioning chiller system

Hassan

Mahmood

Akmal

et al. 2020

Int Trans Electr Energ Syst

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“…An extensive design study was conducted to select an appropriate electric motor. The motors studied had a very wide operating range and are a higher efficiency power source when compared to internal combustion engines (ICE), as they typically range from 65% to 95% round-trip efficiency (21,22). The design study suggested that the most suitable EM for our low-cost HEV is a Brushless DC Motor (BLDC), with a rated continuous mechanical power output of 10 kW (30 kW peak), operating at 96 V. Because of our intended use profile involves short pulses of high power for torque-filling, the peak mechanical power figure is as significant in our consideration as the continuous output.…”

Section: Architecture and Development Approachmentioning

confidence: 99%

Comparative fuel economy, cost and emissions analysis of a novel mild hybrid and conventional vehicles

Awadallah

Tawadros

Walker

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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Mild hybrid vehicles have been explored as a potential pathway to reduce vehicle emissions cost-effectively. The use of manual transmissions to develop novel hybrid vehicles provides an alternate route to producing low cost electrified powertrains. In this paper, a comparative analysis examining a conventional vehicle and a Mild HEV is presented. The analysis considers fuel economy, capital and ongoing costs, and environmental emissions, and includes developmental analysis and simulation using mathematical models. Vehicle emissions (nitrogen oxides, carbon monoxide and hydrocarbons) and fuel economy are computed, analysed, and compared using a number of alternative driving cycles and their weighted combination. Different driver styles are also evaluated. Studying the relationship between the fuel economy and driveability, where driveability is addressed using fueleconomical gear shift strategies. Our simulation suggests the hybrid concept presented can deliver fuel economy gains of between 5 and 10 percent, as compared to the conventional powertrain.

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“…VW e-Golf, Nissan Leaf, BYD e6 and even Tesla Model S. It is very true that electric motors have a very wide operating range and higher efficiency power source comparing to internal combustion engine (ICE), but it doesn't mean that electric motors are equally efficient at all driving speeds and torques. In fact there is a 30% efficiency variation through the range of actual driving conditions for daily-use to peak efficiency regions, typically from 65% to 95% [1]. However, the ratio of SR on BEVs must inevitably be designed as a trade-off between the longer driving range and satisfactory dynamic performance.…”

Section: Introductionmentioning

confidence: 99%

A comparative study energy consumption and costs of battery electric vehicle transmissions

2016

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Despite the long-term benefit of battery electric vehicles (BEVs) to customers and environment, the initial cost and limited driving range present significant barriers for wide spread commercialization. The integration of multi-speed transmissions to BEVs' powertrain systems in place of fixed ratio reduction transmissions is considered as a feasible method to improve powertrain efficiency and extend limited driving range for a fixed battery size. The aim of this paper is to enable the researchers or BEV manufacturers, especially for transmission systems, to estimate whether their products are worthwhile for the customer in terms of the price/performance relationship of others' design solutions. To do so a generic battery electric vehicle is modelled in Matlab/Simulink® to predict motor efficiency and energy consumption for single reduction, two speeds Dual Clutch Transmission (DCT) and simplified Continuous Variable Transmission (CVT) equipped battery electric vehicles. A credible conclusion is gained, through experimental validation of single speed and two speeds DCT scenarios and reasonable assumptions to support the CVT scenario, that both two speeds DCT and simplified CVT improve the overall powertrain efficiency, save battery energy and reduce customer costs. However, each of the configurations has unique cost and energy consumption related trade-offs.

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A novel method to determine the motor efficiency under variable speed operations and partial load conditions

Cited by 59 publications

References 8 publications

Optimum operation of low voltage variable‐frequency drives to improve the performance of heating, ventilation, and air conditioning chiller system

Optimum operation of low voltage variable‐frequency drives to improve the performance of heating, ventilation, and air conditioning chiller system

Comparative fuel economy, cost and emissions analysis of a novel mild hybrid and conventional vehicles

A comparative study energy consumption and costs of battery electric vehicle transmissions

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