Fan Motor Research Articles

Early development of an energy recovery wind turbine generator for exhaust air system

An innovative idea on extracting clean energy from man-made wind resources with micro wind turbine system for power generation is introduced in this paper. This system generates on-site clean energy using a micro wind generation system. A vertical axis wind turbine (VAWT) with an enclosure is mounted above a cooling tower’s exhaust fan to harness the wind energy for producing electricity. The VAWT is positioned at a specific position at the cooling tower outlet to avoid a negative impact on the performance of the cooling tower. The enclosure can act as a safety cover and also enhance the performance of the VAWT. It is designed with several guide-vanes positioned at the up-stream side of the wind turbine to create a venturi effect and guide the wind before it interacts with the turbine blades. Moreover, the enclosure design is comprised of diffuser-plates that can draw more wind and accelerate the flow. Laboratory test conducted on a scaled model shows no measurable difference in the air intake speed and current consumption of the power-driven fan when the turbine was spinning above the cooling tower. Field test on an actual induced-draft cooling tower shows no significant difference on the outlet air speed of the cooling tower. A small difference was observed on the power consumption by the fan motor which is 0.39% higher with the presence of the VAWT. This system is retrofit-able to existing cooling towers and has very high market potential due to abundant cooling towers and other unnatural exhaust air resources globally.

607 ファンモーターの振動・騒音の実証研究(OS9 オーガナイズドセッション《振動・音響・制御》)

The significant noise from fan motors is caused by pressure fluctuation and structural vibration. Recently, low noise fan motors have been requested. To supply the low noise fan motor, it is important to investigate the vibration and noise characteristics of fan motor. In this paper, the vibration and noise characteristics of fan motor and the mechanism are clarified experimentally.

11203 ファンモータの振動解析(OS8-1【振動騒音および制御(1)】))

Subject of study is the fan motor. This is large compared to a typical fan motor. This is used for the purpose of cooling and blower such as an inverter. When the fan is running, it may occurs resonance fracture and stress fracture. Therefore, it is necessary to avoid resonance vibration and to analyze stress .Vibration analysis is carried out by experimental modal analysis and FEM calculations. Stress analysis is performed by FEM and running test. To experiment with the three wings of the material. (Polyethylene terephthalate polycarbonate Glass fiber 40%, Poly Phenylene Sulfide Resin,)

Controlling Indoor Benzene Concentrations using a Fuzzy System

Indoor occupational exposure to hazardous concentrations of Volatile Organic Compounds (VOC) at small workshops could have impact in the health of the workers, resulting in severe intoxication, respiratory diseases or even cancer. Therefore, controlling the concentration of (VOCs) in indoors is necessary to avoid injuries of the workers. In this manuscript it is presented a strategy to reduce hazardous indoor air benzene concentrations in small workshops through the use of a fuzzy logic controller. The closed room is separated in two defined zones using the Near Field-Far Field (NF-FF) model. From the knowledge of the (NF-FF) model a Mamdani fuzzy model controller was designed to maintain the benzene concentration within secure levels for the workers. Fuzzy systems can be analyzed as a mapping between an input data vector (error) and a control output. The input-output behavior is defined by fuzzy rules which infer an output value from an input value. A fuzzy control system is used to characterize the duty cycle required by a pulse width modulator (PWM), which controls the speed of direct current (DC) motors of exhaust fans; thus keeping the indoor air benzene concentration within the regulations established by the EPA (0.03 mg/m3). The simulation results show that the proposed fuzzy control is promissory to assure indoor air quality in this kind of work environments.

Noise Reduction of Fan Motors Considering Supporting Structure for the Fan

Noise Reduction of Fan Motors Considering Supporting Structure for the Fan

Characterisation of Structure-Borne Sound Source Using Reception Plate Method

A laboratory-based experiment procedure of reception plate method for structure-borne sound source characterisation is reported in this paper. The method uses the assumption that the input power from the source installed on the plate is equal to the power dissipated by the plate. In this experiment, rectangular plates having high and low mobility relative to that of the source were used as the reception plates and a small electric fan motor was acting as the structure-borne source. The data representing the source characteristics, namely, the free velocity and the source mobility, were obtained and compared with those from direct measurement. Assumptions and constraints employing this method are discussed.

센서리스 제어방식 IPMSM 팬 모터의 홀센서를 이용한 중·고속 재기동 성능개선

This paper investigates the restart performance of sensorlessly controlled IPMSM Fan motor free-running in middle or high speed range just after inverter power off. There could be some difficulties to extract exact position information by using conventional sensorless control for restarting the motor because of stopped inverter operation. To solve this problem, we proposes to use low cost hall sensor. Using a hall sensor with SMO (Sliding Mode Observer) give us a solution to facilitate rotor position information extraction. The algorithm in this paper shows a certain way of the restarting method.

Developing of a Fuzzy Logic Controller for Air Conditioning System

Reducing energy consumption and to ensure thermal comfort are two important considerations in designing an air conditioning system. The control strategy proposed is fuzzy logic controller (FLC).This paper describes the development of an algorithm for air condition control system based on fuzzy logic (FL) to provide the conditions necessary for comfort living inside a building.Simulation of the controlling air conditioning system, on which the strategy is adopted, was carried out based on MATLAB This system consists of two sensors for feedback control: one to monitor temperature and another one to monitor humidity. The controller i.e. FLC was developed to control the compressor motor speed and fan speed in order to maintain the room temperature at or close to the setpoint temperature.

Design and control of a switched-reluctance motor-driven cooling fan

This study presents the design, implementation and driving control of a switched-reluctance motor (SRM)-driven cooling fan. First, after exploring the motor structural features, a 70-W three-phase SRM with six of four teeth is designed, manufactured and estimated its key parameters. Secondly, a Miller converter and an asymmetric bridge converter are constructed with their switching and commutation shift schemes being properly designed. Thorough experimental evaluations are conducted for the SRM-driven fan powered by different converters. It shows that proper commutation shift can enhance the driving performance of SRM drive, particularly for the one powered using Miller converter. Further comparative performance assessment is also made between the developed SRM-driven fan and an available brushless DC motor fan with the same fan blade, the results confirm the application potential possessed by SRM. Finally, a front-end flyback switch-mode rectifier (SMR) is developed and used to establish well-regulated DC-link voltage for the SRM converter from mains with satisfactory line-drawn power quality.

A Permanent Magnet Brushless DC Motor With Bifilar Winding for Automotive Engine Cooling Application

This paper presents a sensorless bifilar wound permanent magnet brushless DC (BW-PMBLDC) motor fan for automotive engine cooling applications. The key is to incorporate the bifilar winding design into the conventional half-wave PMBLDC motor. Due to the perfect flux-coupling effect between bifilar winding, a regenerative capability is developed so that the trapped energy in the conducting winding during the turn-off period can be re-dumped to DC source through the other winding in the bifilar pair, hence effectively promoting the energy efficiency and repressing the voltage spikes. Moreover, the complementary scheme developed between the bifilar wound phases enables bipolar excitation on the unipolar converter topology. Therefore, the BWPMBLDC motor cannot only offer the advantages of full-wave motor in efficiency, voltage spike reduction, and low torque ripple, but also retain the advantages of simplicity and robustness of unipolar converter topology. Both simulation and experimental results are presented to validate the feasibility.

Design of a mobile PEM power backup system through detailed dynamic and control analysis

Abstract In this paper we present a one dimensional dynamic model of a PEM fuel cell applied to the design of a mobile backup system for uninterruptable power units. The fuel cell is modeled using a finite difference approach where mass and energy balance equations are applied locally together with the pertinent equations of the electrochemical model yielding the profiles of any relevant thermodynamic and electrochemical cell variable. An accurate analysis of the membrane humidification is included based on state of the art models available in literature. In this system the fuel cell is fed by pure hydrogen taken from a lithium hydride hydrogen storage while ambient air is supplied to the cathode by an inverter-fed electric motor fan. A preliminary design of the main components is provided for a target operating time of 48 h. Dynamic simulations are then carried out applying to the fuel cell the actual electricity load of a computer file server that was experimentally measured by a power measurement device over a period of 0.5 h. Results of the simulations show that with an appropriate choice of the controllers parameters it is possible to maintain effective cell operation under different load variations keeping the key variables of the fuel cell within the desired set point targets.

Modelling and Identification of Oxygen Excess Ratio of Self-Humidified PEM Fuel Cell System

One essential parameter in fuel cell operation is oxygen excess ratio which describes comparison between reacted and supplied oxygen number in cathode. Oxygen excess ratio relates to fuel cell safety and lifetime. This paper explains development of air feed model and oxygen excess ratio calculation in commercial self-humidified PEM fuel cell system with 1 kW output power. This modelling was developed from measured data which was limited in open loop system. It was carried out to get relationship between oxygen excess ratio with stack output current and fan motor voltage. It generated fourth-order 56.26% best fit ARX linear polynomial model estimation (loss function = 0.0159, FPE = 0.0159) and second-order ARX nonlinear model estimation with 75 units of wavenet estimator with 84.95% best fit (loss function = 0.0139). The second-order ARX model linearization yielded 78.18% best fit (loss function = 0.0009, FPE = 0.0009).

Optimizing Efficiency Driver Comprising Phase-Locked Loop for the Single-Phase Brushless DC Fan Motor

Because the single-phase brushless fan motor presents an inductive load, the winding current will lag the back-electromotive force (EMF) an unequal phase based on the different motor speed. In order to improve the efficiency and torque performance, adjusting the commutation angle to keep the optimizing commutation at different speed is necessary. In this paper, the new structure with low cost to achieve the optimizing commutation is accomplished by the concept of phase-locked loop (PLL) to synchronize the winding current and back EMF. The PLL IC CD4046 is adopted to develop a feedback circuit and performs the function of phase advance. The purpose is to force the winding current to be synchronized with the back-EMF. Finally, the related experimental results are used to confirm the feasibility and effectiveness of the proposed driving method.

Experiment for Attaching Force of a Suction Fan on Various Concrete Wall Surfaces

In order to measure attaching performance of the suction fan against a concrete wall, test apparatus measuring suction force of the fan was developed. Using this test apparatus, four types of concrete wall specimens were tested to measure the attaching force. The test apparatus consisted of a fan motor, a pneumatic cylinder, a load cell, and sensors for vacuum pressure and a rotating speed of the fan. Vertical wall surface of concrete material were manufactured to four different shapes that is flat, step, rib and embossing type. When the fan is rotating in the fan-housing which is fixed by metal frame, the wall specimen is moved near to fan-housing edge by the pneumatic cylinder. And the specimen may be attached to fan-housing edge by suction force of the fan, and the wall specimen is reversely moved away from the fan-housing edge by the pneumatic cylinder. Then suction force of the fan was measured using a load cell. And the suction force was measured depending on specimen types and varying the rotation speed of the fan. Test result shows that the fan speed is proportional to the suction force, and interestingly, suction force is almost independent from the specimen shapes. The maximum suction force was equally measured with 231.9 N on the step and embossing type surface with 1,800 rpm.

Complexity mapping of the product and assembly system

PurposeThe purpose of this paper is to present methods for assessing and mapping the complexity of products and their assembly. In cases of complexity of assembly it is important to consider and model at the product design stages when only data about individual parts/products and their assembly attributes are known. Assessing the complexity of assembly systems, based on the attributes of their components, is an essential step towards designing them for the least complexity.Design/methodology/approachThis paper presents a mapping method between the complexity of products and their variants and complexity of the system needed to assemble them. A method has also been developed to assess and compare the complexity of assembly systems based on the characteristics of their physical components for comparison and re‐design to reduce complexity.FindingsThe complexity dependency matrix estimates the average assembly equipment complexity for a certain product based on the interactions between parts handling, insertion and assembly attributes and assembly system functions. An automobile engine piston, domestic appliance drive, car fan motor and a three‐pin electric power plug products were used to demonstrate the application of the developed methodology.Originality/valueThe developed methods can be used by products and assembly systems designers to identify and alleviate major sources of complexity.

Linking HVAC type and student achievement

Research has long-linked HVAC system type to room noise levels, and it has long-linked room noise levels to student learning. Uninformed design decisions and the absence of policy combine with ineffective execution and insufficient enforcement to produce noisy mechanical systems for schools. Some school HVAC systems place both fans and compressors in the classroom itself, as part of DX units; others utilize remote compressors as part of chillers, but in-room fan motors as part of fan coil units; still other systems use remote AHUs and remote chillers so that neither compressor nor fan motor is exposed to the classroom. This pilot study intends to search for a broader link between HVAC system type and student achievement exams in elementary schools.

Research and Development of High Efficiency & Energy Saving Series, High-Voltage & Flame Proof Three Phase Asynchronous Motor for Fan

In order to save energy, decrease the loss and improve the technology level of high voltage flame proof three phrase asynchronous motor for fan, the condition, problem and development trend of the motor are studied in the paper. The motor structure, wind path system, electromagnetic scheme, insulation structure, electrical explosion-proof structure are improved, and non electric explosion-proof theory and low noise design are firstly applied in the research and development of motor. The efficiency of the motor is improved 2% by the method of optimizing the structure of motor and improving the making technology. The new motor not only has high efficiency and advanced and reliable structure, but also is safety in use, convenience in maintenance, has better social and economical benefits and better market prospect.

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 effort 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, to recommission, and to optimize operation. This is then followed by continuous performance monitoring, 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, many have redundant systems where either could handle the entire load. Therefore, one of the overlooked opportunities for saving energy is the evaporator fan motor (heater) that operates 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 end users who have taken something complicated and were able to change their own perspective and change behavior with simple, user friendly, web-based tools.

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.