Fan Motor Research Articles

고객관점의 음식물처리기 개발을 위한 QFD를 활용한 제품품질요인 분석

Recently the market of the food waste disposer has increased. Therefore, many companies in the development of food garbage disposer has been increasing interest. In this study, we used QFD (Quality Function Development) to find out the quality factors for the development of the food waste disposer reflecting the consumer needs. HOQ (House Of Quality) showing the correlation between consumer characteristic and engineering characteristic was written by investigating the consumer needs based on the consumer complaints and survey. In addition, we generated the CTQ (Critical To Quality) reflecting the weighting of the importance of the parts. As the research result, the important quality factors for the food garbage disposer were the grinding capability, drying, and odor emission features. The crushing motor associated with grinding and dehydration appeared as the most important quality factors among the parts. Second thing was the fan motor associated with odor. The findings will be able to contribute to the development of the food waste disposer reflecting the consumer needs.

Development of a miniature fan motor

A novel compact axial flux fan motor was developed. Such a micromotor could be a potential candidate for using as the cooling solution for the next generation mobile devices, for example, smart phones and pico-projectors. The key parameters of the motor, such as back electromotive force, cogging torque, and axial preload are predicted using finite element method. In addition, new approaches are proposed to measure these items, and the corresponding experimental results are in good agreement with the simulated one. Moreover, the undesired vibration harmonic is successfully suppressed, and the fan motor represents a high static pressure and air flow rate.

Steady-State Circular Motion Performance Experiments Research about an All Terrain Vehicle

An all terrain vehicle is a kind of special vehicle that travels on all-road. It should have better handling characteristics. In order to evaluate handling performance of an ATV, steady-state circular motion performance experiments about the ATV are done and steady state response characteristic is analyzed. The results show that the ATV studied has under-steering characteristics which is a good turning state and the results correspond with test report about Santana Xi5 on the road test at Journal of Motor Fan in Japan.

The Derivation of Efficiency Equation of the Prototype of Pico Wind Turbine Produces the Electricity

This research has purposed to derive efficiency equation of the prototype of pico wind turbine produces the electricity (PPWTPE). By using a ventilating fan of 12cm diameter as a blower, at rotating speed of 2,880rpm. Blower blew the wind to PPWTPE of alternator. The wind turbine of alternator modified from magnet motor of central processing unit fan of computer. Magnet motor composes of the cylindrical magnet 30mm diameters, magnetic field intensity of 70 mT, 7 propellers of 74mm diameter. These components were enclosed at the center of wind turbine rotate around copper line no.40 as 4 coils, each coil 550 turns. It shows that, the distance between blower and the pico wind turbine of 8cm obtained the wind speed 7.14 m/s, the PPWTPE rotated of 855rpm. The magnet was rotated around the 4 coils and induced the accelerating voltage of 4.9 volts and accelerating current 17.52mA in 4 coils. The induced accelerating current from 4 coils sent AC signal to bridge rectifier circuit converts AC to DC obtained voltage of 3.60V and DC current of 14.90mA, and the 7 LED lamps were bright. By using a derived efficiency equation of the PPWTPE, the PPWTPE has estimate efficiency of 9%.

Sound Quality for Micro Axial Fan with Blade Run-Out

This paper describes sound quality changes caused by a sound aerodynamic failure in a micro-axial fan when applying acoustic diagnostic methods at a cooling fan motor assembly line. The aerodynamic failure sound was focused to a rotational fan blade tone and a blade passing noise with a change in the fan blade run-out. Experimentally obtained results clarified the correlation between the sound quality metrics (Sharpness, Roughness, Fluctuation strength, Tone-to-noise ratio) and the blade run-out. Furthermore, an acoustic diagnosis technique for fan blade run-out is proposed using an adaptive spectrum enhancer. This proposed acoustic diagnosis technique is used for an adaptive feedback algorithm using an internal model control architecture to extract an abnormal periodic signal including aerodynamic sound generated by a rotating micro-axial fan. The experimentally obtained results show that the blade passing sound signal with the blade run-out change was improved by about 10 dB using this adaptive feedback algorithm.

131 ファンの支持構造に着目したファンモータの騒音低減(流れと関連した騒音の解析・低減)

131 ファンの支持構造に着目したファンモータの騒音低減(流れと関連した騒音の解析・低減)

Research on FFU Power Supply Based on Variable Universe Adaptive Fuzzy Control

There are serious nonlinear, variable strongly coupling characteristic in traditional fan filter units (FFU) motor, and its electromagnetic relationship is hard to analyze. In order to solve these problems, and because the FFU motor has serious nonlinear, variable strongly coupling characteristic, a control system for FFU motor speed regulation is carried out based on the variable universe fuzzy theory, which can modify universe according to the change of inputs. The simulation analysin and experimental results are prposed and verified the power supply can more effectively achieve the FFU fan motor variable frequency speed regulation control than traditional methods and the performance of the proposed control strategy.

A techno-economic analysis of cost savings for retrofitting industrial aerial coolers with variable frequency drives

A techno-economic model was created in order to develop curves that show the typical annual energy savings, rate of return, and payback for retrofitting aerial coolers with variable frequency drives (VFDs) for up to 50 motors, motor sizes from 4 to 186 kW (5–250 hp), and varying climate conditions. The cost savings due to installing a VFD depends on the reduction in energy used, as well as the reduction in power demand, the capital cost of the VFD, installation cost of the VFD, change in operating cost, and cost of electricity. The geographic locations examined in this report were Fort McMurray, Calgary, Vancouver, and Thunder Bay. This study found that the IRR increases rapidly with motor size, becomes greater than 10% at a motor size of approximately 15 kW, and may be as high as 220% (for the case of fifty, 186 kW motors). The IRR is sensitive to the number of fan motors retrofitted with VFDs, however the sensitivity rapidly declines as the number of motors is increased beyond five. The simple payback period becomes less than 1 year and nearly independent of number of motors and motor size for motors larger than 90 kW. Ambient temperature and geographic location affect the profitability of the investment, although the IRR only changes by approximately 4%.

Study on method of Energy-Saving and Efficiency Improvement of Flame Proof Three Phase Asynchronous Motor for Fan

All kinds of factors affecting the efficiency of three phase asynchronous motor are studied, the methods of energy-saving and efficiency improvement of flame proof three phase asynchronous motor for fan are analyzed form the aspect of calculation of electromagnetism, selection of material, design of wind path, machining process etc, the practical optimizing methods are put forward and are verified through the product. The experiment show that the efficiency of the motor designed according to this method has improved greatly. So these methods provide some reference for the design of flame proof three phase asynchronous motor for fan. Other methods that could be used to saving energy are also analyzed in theory in the paper, which offer some reference for the enterprise using mining flame proof fan to seek the method of energy-saving and efficiency improvement.

Single-Phase Hybrid Switched Reluctance Motor for Low-Power Low-Cost Applications

This paper presents a new single-phase, Hybrid Switched Reluctance (HSR) motor for low-cost, low-power, pump or fan drive systems. Its single-phase configuration allows use of a simple converter to reduce the system cost. Cheap ferrite magnets are used and arranged in a special flux concentration manner to increase effectively the torque density and efficiency of this machine. The efficiency of this machine is comparable to the efficiency of a traditional permanent magnet machine in the similar power range. The cogging torque, due to the existence of the permanent magnetic field, is beneficially used to reduce the torque ripple and enable self-starting of the machine. The starting torque of this machine is significantly improved by a slight extension of the stator pole-arc. A prototype machine and a complete drive system has been manufactured and tested. Results are given in this paper.

Chillers energy consumption, energy savings and emission analysis in an institutional buildings

Chillers consume more than 40% of the total energy used in the commercial and industrial buildings for space conditioning. In this paper, energy consumption by chillers and chilled water pumps, condenser pumps and fan motors has been estimated using data collected by a walkthrough energy audit for the 16 faculties of the University of Malaya. It has been estimated that chillers and motors and pumps used in chillers consume 10,737 MWh (i.e. 51% of total energy consumption) of electric energy for different percentage of loadings. As chillers are major energy users, variable speed drives are applied in chillers to reduce their energy consumption. It has been estimated that about 8368 MWh annual energy can be saved by using efficient chillers at different loadings. It has also been found that about 23,532 MWh annual energy can be saved for chilled water supply pumps, condenser pumps and cooling tower fan motors by matching required speeds using variable speed drives for 60% of speed reduction. About 1,274,692 kg of CO 2 emission could be avoided for using energy efficient chillers at 50% load. It has been also found that about 2,426,769 kg CO 2 emission can be reduced by using variable speed drives for 60% speed reductions. Payback periods found to be only few months for using variable speed drives in chilled water pumps, condensers and fan motors.

Reduction of motor fan noise using CFD and CAA simulations

Motor fans used for cooling electric motors have long been recognized as one of the major noise sources. Current paper focuses on design of motor fan for electric motors that are used in submarines for pumping sea water. Noise reduction at source is very important and the critical task, for under water applications. An attempt has been made for reduction of motor fan noise by modification of noise sources. For this purpose computational fluid dynamics and computational aeroacoustics code FLUENT package is used to identify the noise sources and to know the overall sound pressure level of motor fan. From these results it is observed that aerodynamic noise is the dominate fan noise source. Aerodynamic noise of motor fan can be reduced by modifying fan geometry. The aerodynamic noise level of motor fan has been reduced by replacing the straight blades with various digits of NACA (National Advisory Committee for Aeronautics) 65 series airfoil sections. From the numerical results it is observed that the minimum sound pressure level for NACA 65-010 is 65.4 dB(A). These numerical results are compared with measurements in a semi-anechoic chamber. It is found that there is good agreement between numerical and experimental results.

Increase Your ROI Today by Optimizing Your Refrigeration with Continuous Commissioning Using Remote Management Tools

ABSTRACT For decades refrigeration has been the target for improving and optimizing energy efficiency. Most of the efforts dealt with the mechanical side, including compressors, condensers, and the controls that manage them. Today we also see enhancements in the type of refrigerants being used. This article will focus more on the evaporator side, including temperature and defrost control and monitoring performance by measuring evaporator coil temperature and compressor amps, which is then used to diagnose state, recommission, and optimize operation. This is then followed by continuous performance monitoring, also known as continuous commissioning of the system. The basis for this article comes from the fact that all refrigeration systems are or should be sized to maintain temperature during the hottest day of the year. Additionally, it is common for systems to be oversized for those hot days. Depending on the size of the cooler or freezer, or the value of the product stored, there are many redundant systems where either can handle the entire load. Therefore, one of the overlooked opportunities for saving energy are the evaporator fan motors (heaters) that operate 24/7 even after the setpoint is achieved. This article will attempt to detail how end users have realized 30–50% energy savings through proper application of safely managing evaporator fan operation and defrost. It will also discuss how end users have taken something complicated and were able to change their perspective and behavior with simple, user-friendly web based tools.

Development of an Axial Gap Motor With Amorphous Metal Cores

This paper presents a novel motor design concept that utilizes amorphous cut cores in the stator and ferrite magnets in the rotor to obtain a high-efficiency motor. This motor employs a six-pole nine-slot axial gap construction and aims to provide 90% efficiency with decreased size and low cogging torque for fan motor applications. Amorphous cut cores are applied to the stator to decrease iron loss and save motor space. Skewed magnets are employed to decrease cogging torque. Three-dimensional finite element analysis was used to analyze motor performance. In order to verify the accuracy of the design, a trial motor was constructed, and a large range of experiments was conducted to measure the motor characteristics. The results of the trial motor meet the design goals.

Nonlinear Dynamic Modeling of a Single-Phase Permanent-Magnet Brushless DC Motor Using 2-D Static Finite-Element Results

A nonlinear dynamic model is proposed for a single-phase permanent-magnet brushless DC (SP PM BLDC) motor to reduce simulation time compared to transient finite-element model and finite-element co-simulation model. The model uses a lookup table of EMF constant and cogging torque obtained from two-dimensional static finite-element analyses. A machine model based on a lookup table is coupled to an inverter model and a load model to form a complete motor model. Nonlinear effects such as cogging torque, magnetic saturation, armature reaction, and switching transients are considered in the model. The simulated results are validated experimentally with a prototype SP PM BLDC external rotor ceiling fan motor.

Performance Evaluation of Energy Efficient Speed Control Techniques for Capacitor-run Single-phase Induction Motor Driving Domestic Fans

This article shows the systematic evaluation of the performance of capacitor-run induction motor driving domestic fans using different power conversion methods. The power converters employed are AC/AC converters with phase angle control and multiple pulse width modulation AC chopper and integral cycle control. It is shown through extensive simulation and experimentation that phase angle control in the main winding of the fan motor yields improved results.

Energy savings and emission reductions in industrial boilers

In this paper energy use of boiler fan motors has been estimated using energy audit data. Energy savings using VSD by modulating fan speed has been estimated as well. Bill savings and associated emission reductions using VSD have been estimated and presented in this paper. It has been found that 139,412 MWh, 268,866, 159,328 MWh, and 99,580 MWh electrical energy can be saved for 40%, 60%, 80% and 100% motor loadings, respectively for 60% speed reduction. Corresponding bill savings for the aforementioned energy savings have been found to be US$7,318,335, US$14,113,933, US$8,363,812, and US135,911,944 for 40%, 60%, 80% and 100% motor loadings, respectively for 60% speed reduction. Along with energy savings, 69,770,744 kg, 134,558,329 kg, 79,738,065 kg, 49,836,603 kg of CO2 emission can be avoided for the associated energy savings as a result of energy savings using VSD for 40%, 60%, 80% and 100% motor loadings. Moreover, 32,503,558 GJ of fossil fuel can be saved for the flue gas temperature reduction as a result of reducing fan motor speed reduction. Flue gas energy savings for oxegen trim system has been estimated and found to be 549,310,130 GJ for 16.9% of excess air reduction with payback period less than a day.

Technical Note: Development and Testing of an Induction-Operated Current Switch for Monitoring Fan Operation

Emissions of gaseous compounds and particulate matter are the product of the pollutant concentrations and air exhausted from the fans of mechanically ventilated animal confinements. Direct methods of monitoring exhaust fan operation (mercury tilt, limit/ whisker, and vibration switches) have been reported to have limitations due to mechanical failure and/or the effect of dust, wind, and moisture. The objective of this study was to find a reliable method of monitoring fan operation status. This article describes the development, lab testing, and field use of a fan monitoring system based on an induction-operated current switch (ICS). The ICS is unaffected by the environment and can provide direct measurement of real-time fan operational status by sensing the AC current drawn by the fan motor. A laboratory test of the ICS was performed to simulate a fan off/on duty cycle for a two-year field emissions monitoring study; no ICS failure was recorded. Three studies led by Iowa State University (Southeastern Broiler Gaseous and Particulate Matter Emission, Determining Ammonia and Particulate Matter Emissions from a Midwest Turkey Grow-Out Building, and Feeding DDGS and Other Altered Diets to Egg Laying Hens to Demonstrate Economically Viable Reductions in Ammonia Emissions) used a total of 28, 12, and 50 ICS systems for 24, 16, and 27 months, respectively, without a non-user error related failure. At a unit cost as low as $21.45 this method offers a reliable, accurate, and economical way of measuring the real-time operational status of ventilation fans – a critical component of any air emissions monitoring in a mechanically ventilated confinement.

Intelligent system based on wavelet decomposition and neural network for predicting of fan speed for energy saving in HVAC system

In this study, a heating, ventilating and air-conditioning (HVAC) system with different zones was designed and tested. Its fan motor speed and damper gap rates were controlled by two controllers (i.e. a PID controller and an intelligent controller) in real time to minimize its energy consumption. The desired temperatures were realized by variable flow-rate by considering the ambient temperature for each zone and evaporator. The PID parameters obtained in our previous theoretical work using fuzzy logic were utilized in this study. The experimental data used in this study was collected using a HVAC system built in a laboratory environment. The fan motor speed and damper gap rates were predicted using wavelet packet decomposition (WPD), entropy, and neural network (NN) techniques. WPD was used to reduce the input vector dimensions of the intelligent model. The suitable architecture of the NN model is determined after certain trial and error steps. According to test results, the developed model performance is at desirable level. Efficiency of the developed method was tested and a mean 95.62% recognition success was obtained. This model is an efficient and robust tool to predict damper gap rates and fan motor speed to minimize energy consumption of the HVAC system.

Performance Analysis of Brushless DC Motor According to Polar Magnetizing Characteristic of Ferrite Bonded Permanent Magnet

Abstract - The magnetization directions of a polar magnetized ferrite‐bonded magnet are analyzed by finite element method (FEM). The influence of the width of SmCo magnets for magnetic field generation is investigated. The surface flux densities of the polar anisotropic magnets are analyzed and compared according to the pole number and thickness of the magnets. And the electromotive force (EMF) values of brushless DC motors with the magnets are investigated. The validity of the analysis method is verified by comparing the analyzed results with measured ones.Key Words : Brushless DC motor, Polar anisotropic, Ferrite bonded magnet, Magnetic field, Electromotive force. *펠로우회원 : 동국대 공대 전자전기공학부 교수․공박E-mail : baekuniv@dongguk.edu 접수일자 : 2010년 10월 15일 최종완료 : 2010년 nylon,11월 17일 1. INTRODUCTION Ferrite-bonded magnets are widely used in small brushless DC motors for many applications such as fan and pump motor. As a magnet material, ferrite material is frequently used for low torque applications[1]. Ferrite magnets are classified into isotropic and anisotropic material as their material characteristics, and classified into sintered and bonded magnets according to the manufacturing methods. Bonded magnets are made by injection molding process of mixed ferrite powder with binder such as nylon. At this procedure, appropriate magnetic field is applied in order to determine the anisotropic directions[2]. In many cases, ferrite-bonded magnets (frequently names as plastic magnets) are made with polar anisotropy for brushless DC motor applications, and the magnets do not need ferromagnetic back yoke. It reduces manufacturing cost and inertia of the rotating part. The characteristics of the polar anisotropic plastic magnets are different from parallel or radially directed magnets[3]. In this paper, the magnetization directions of a polar anisotropic plastic magnet are analyzed by finite element method (FEM). The influence of the width of SmCo magnets for magnetic field generation is investigated. And, the surface flux densities of the polar anisotropic magnets are analyzed and compared according to the pole number and thickness of the magnets. The electromotive force (EMF) values of brushless DC motors with the magnets are investigated. The validity of the analysis method is verified by comparing the analyzed results with measured ones.