Fan Motor Research Articles

Methodology for system-level analysis of a fan–motor design for a vacuum cleaner

In the present study, a methodology for conducting a system-level analysis of a fan–motor assembly in a vacuum cleaner is presented. This system consisted of three components, a fan, motor, and the flow resistance of the motor, or of the vacuum cleaner. The combined characteristics of the fan and the motor were obtained from torque matching at a constant throttling condition, and a pressure drop was implemented under a constant flow rate to account for the flow resistance. By combining these two steps, the performance characteristics of the fan–motor assembly and the vacuum cleaner system could be predicted over the whole range of operation, based on the characteristics of each component. The predicted performance for power, flow rate, pressure, and efficiency using the present method agreed well with the experimental results obtained for an equivalent system, within 2% difference at best efficiency point. Three models of the fan–motor assembly (S1, S2, and S3) were analyzed at the component level, and the decrease in efficiency produced by flow resistance was estimated to be 1% (S1 and S3 models) or 4.7% (S2 model) using the present method. The characteristics of the fan, extracted from those of the fan–motor assembly, were used for validating the computational fluid dynamics. The computational fluid dynamics results of this study predicted higher efficiency due to simplification of the geometry, but an accurate prediction of best efficiency point location was obtained. The proposed method is also applicable for detecting system leakage and identifying system resistance without direct measurement.

Novel Design and 3-D Printing of Nonassembly Controllable Pneumatic Robots

Additive manufacturing (known as 3-D printing to the public) technologies are capable of fabricating mechanical parts without the limitation of geometric complexity. If properly designed, a mechanism can also be automatically fabricated without the need of assembly. Considering these capabilities of 3-D printing, this paper presents a novel pneumatic robot design that can be fabricated by 3-D printing processes without the need of assembly. The key element of the proposed robot is the innovative design of a pneumatic stepper motor that allows control of multimotion pattern modes. The proposed pneumatic stepper design is based on a fan motor, thus, having a low requirement on airtightness, which makes it possible for 3-D printing fabrication. For angular motion control, a roller valve is added to the fan motor design. By controlling the air pressure of the roller valve, continuous motion and stepping motion can be obtained. Experiments have shown that the angular velocity can also be controlled by varying the roller-valve air pressure. The effectiveness of the proposed concepts has been demonstrated by a 3-D printed nonassembly pneumatic robot. The printed robot, when connected with air tubes and a pneumatic controller, can perform simple pick and place operations. It is argued that the future functional nonassembly pneumatic robotic systems could be 3-D printed for relevant industries.

The effects of vent channels and metal conductive base on thermal characteristics of the active graphite-composite cylindrical heat sink

This study proposed a novel configuration of active LED graphite-composite heat sink and experimentally investigated the effects of vent channels and metal conductive base on the fluid flow and heat transfer characteristics of this active heat sink. The heat sink was made of the graphite powders, aluminum-alloy powders, and adhesive mixed in specific proportion by the vacuum-pressure injection technique. The cost and weight of this graphite-composite material are much lower than those of aluminum alloy. The configuration of heat sink is a hollow circular cylinder with multiple radial fins. Different motor fans can be put in the chamber of heat sink, with various vent-channel positions and orientations (vertical vent channels, horizontal upper-row vent channels, and horizontal bottom-row vent channels) and numbers of channels (24, 36, 48, and 72) in the heat sink to enhance overall cooling performance by driving through airflow. The results indicate that the overall Nusselt number (Nu) of the graphite-composite heat sink with motor fan was 2.23–2.50 times that without motor fan. The numbers of vent channels in heat sink were positively related to the total flow rate of through air. Thus, the heat sink with the most vent channels had the maximum Nu in the motor-fan mode. When an additional annular aluminum-alloy conductive base was mounted in the graphite-composite heat sink with the most vent-channel configuration, the Nu was 35% higher than that without conductive base in motor-fan mode, proving the metal conductive base was effective. The optimal vent-channel configuration in this study was also used for the full aluminum-alloy heat sink, the corresponding Nu of the models without/with motor fan were compared with the full aluminum-alloy heat sink without vent channel, the heat transfer enhancements were about 13% and 127%, respectively.

Motor Bearing Fault Detection Using Spectral Kurtosis-Based Feature Extraction Coupled With K-Nearest Neighbor Distance Analysis

Bearing faults are the main contributors to the failure of electric motors. Although a number of vibration analysis methods have been developed for the detection of bearing faults, false alarms still result in losses. This paper presents a method that detects bearing faults and monitors the degradation of bearings in electric motors. Based on spectral kurtosis (SK) and cross correlation, the method extracts fault features that represent different faults, and the features are then combined to form a health index using principal component analysis (PCA) and a semisupervised k-nearest neighbor (KNN) distance measure. The method was validated by experiments using a machinery fault simulator and a computer cooling fan motor bearing. The method is able to detect incipient faults and diagnose the locations of faults under masking noise. It also provides a health index that tracks the degradation of faults without missing intermittent faults. Moreover, faulty reference data are not required.

PENGUKURAN OVERALL EQUIPMENT EFFECTIVENESS (OEE) DENGAN LABVIEW 8.5 SEBAGAI PENGENDALI MAINTENANCE

Abstract 
 
 Total Productive Maintenance (TPM) is a philosophy that aims to maximize the effectiveness of the facilities used in industry, it is applied to analyze problems that occur on any equipment and machinery with a method of calculation of Overall Equipment Effectiveness (OEE) of product quality. Value is determined by OEE Availability, Performance and Yield / Quality. LabVIEW (Laboratory Virtual Instrument Engineering Workbench) software is dedicated to the activities of the interface and control electronic devices by using a personal computer (PC). LabVIEW program allows to operate the instrument, measure and analyze data accurately, and show results quickly. PT OEI which produces DC Fan Motor for computers wants to know the value of OEE of production machinery as a basis for maintenance policy. The 4 types of machines studied have value of 94% Availability, Performance 54.055%, 99.24% and OEE Quality 50.416%. According to Nakajima performance is very low (standard> 90%) and resulted in OEE low, this is the effect of the low speed machines. The measurement is done with the method xl windows and LabVIEW 8.5, while measurements with LabVIEW 8.5 is much more practical and can display OEE variables simultaneously with attractive appearance that will facilitate the maintenance control. 
 
 Keywords: TPM, OEE, LabVIEW 8.5.

A novel method of determining events in combination gas boilers: Assessing the feasibility of a passive acoustic sensor

To assess the impact of interventions designed to reduce residential space heating demand, investigators must be armed with field-trial applicable techniques that accurately measure space heating energy use. This study assesses the feasibility of using a passive acoustic sensor to detect gas consumption events in domestic combination gas-fired boilers (C-GFBs). The investigation has shown, for the C-GFB investigated, the following events are discernible using a passive acoustic sensor: demand type (hot water or central heating); boiler ignition time; and pre-mix fan motor speed. A detection algorithm was developed to automatically identify demand type and burner ignition time with accuracies of 100% and 97% respectfully. Demand type was determined by training a naive Bayes classifier on 20 features of the acoustic profile at the start of a demand event. Burner ignition was determined by detecting low frequency (5–10 Hz) pressure pulsations produced during ignition. The acoustic signatures of the pre-mix fan and circulation-pump were identified manually. Additional work is required to detect burner duration, deal with detection in the presence of increased noise and expand the range of boilers investigated. There are considerable implications resulting from the widespread use of such techniques on improving understanding of space heating demand.

ファンモータの振動騒音発生現象の解明に関する研究

ファンモータの振動騒音発生現象の解明に関する研究

Разработка автономной тепловой пушки для ремонта и обслуживания инженерных сетей

In this article the authors present the of theoretical and experimental studies of gas-burning devices with chordal feed of gas jets. The optimum diameter of the nozzles, providing the necessary range of gas jets for high-quality mixing of fuel gas and air in the mixing chamber of minimum length is determined by calculation. According to the analysis of the parameters of the flame indirectly proved the reliability of the calculated data. Chordal flow of the gas jets and optimization of their range will significantly reduce the overall structural dimensions of the gas burner units. Short-flame gas-burning devices formed the basis for the creation of Autonomous heat gun, intended for repair and maintenance of engineering networks. To achieve a good heat gun is ensured by the motor fan, capable of generating high-pressure jet without connection to an external electrical network. Using of autonomous heat gun in the housing and communal services is very promising in comparison with analogues.

Examination of a newly developed mobile dry scrubber (DS) for coal mine dust control applications.

The Office of Mine Safety and Health Research of the U.S. National Institute for Occupational Safety and Health (NIOSH OMSHR) conducted laboratory testing of a self-tramming, remotely controlled mobile Dry Scrubber (DS) that J.H. Fletcher and Co. developed under a contract with NIOSH OMSHR to reduce the exposure of miners to airborne dust. The scrubber was found to average greater than 95 percent dust removal efficiency with disposable filters, and 88 and 90 percent, respectively, with optional washable filters in their prewash and post-wash test conditions. Although the washable filters can be reused, washing them generated personal and downstream respirable dust concentrations of 1.2 and 8.3 mg/m3, respectively, for a 10-min washing period. The scrubber's velocity-pressure-regulated variable-frequency-drive fan maintained relatively consistent airflow near the targeted 1.42 and 4.25 m3/s (3,000 and 9,000 ft3/min) airflow rates during most of the laboratory dust testing until reaching its maximum 60-Hz fan motor frequency or horsepower rating at 2,610 Pa (10.5 in. w.g.) of filter differential pressure and 3.97 m3/s (8,420 ft3/min) of scrubber airflow quantity. Laboratory sound level measurements of the scrubber showed that the outlet side of the scrubber was noisier, and the loaded filters increased sound levels compared with clean filters at the same airflow quantities. With loaded filters, the scrubber reached a 90 dB(A) sound level at 2.83 m3/s (6,000 ft3/min) of scrubber airflow, indicating that miners should not be overexposed in relation to MSHA's permissible exposure level - under Title 30 Code of Federal Regulations Part 62.101- of 90 dB(A) at or below this airflow quantity. The scrubber's washable filters were not used during field-testing because of their lower respirable dust removal efficiency and the airborne dust generated by filter washing. Field-testing the scrubber with disposable filters at two underground coal mine sections showed that it could clean a portion of the section return air and provide dust reduction of about 50 percent at the face area downstream of the continuous-miner operation.

The Study on the Vibration and Noise Characteristics Caused by Electromagnetic Force of the Fan Motor with the Offset in the Axial Direction

The Study on the Vibration and Noise Characteristics Caused by Electromagnetic Force of the Fan Motor with the Offset in the Axial Direction

OS1108 インバータ運転時におけるファンモータの騒音と振動の低減

OS1108 インバータ運転時におけるファンモータの騒音と振動の低減

LOGIC SIMULATION OF LIFE SUPPORT SYSTEM COMPONENT IN REAL TIME

The article proposed the use of simulation methods for evaluating the effectiveness of a stepped fan engine speed control while maintaining the air flow volume in the set boundaries of the «fan-filter» system. A detailed algorithm of the program made on the basis of an Any Logic software package. Is analyzed the possibility of using the proposed method in the design of ventilation systems. The proposed method allows at the design stage to determine the maximum replacement intervals of the systems filter elements, as well as to predict the time to switch the fan motor speeds. Using of the technique allows to refuse the complex air flow systems and maximize the life of the filter elements set. Methods of logical processes modeling allows to reduce construction costs and improve energy efficiency of buildings.

Development of the Autonomous Heat Gun for Repair and Maintenance of Utilities

In this article the authors present theoretical and experimental studies of gas-burning devices with the chordal feed of gas jets. The optimum diameter of the nozzles providing for the necessary range of gas jets for a high-quality mixing of fuel gas and air in the mixing chamber of minimum length is determined by calculation. The analysis of the parameters of the flame indirectly proves the reliability of the calculated data. The chordal flow of the gas jets and optimization of their range will significantly reduce the overall structural dimensions of the gas burner units. Short-flame gas-burning devices formed the basis for the creation of the Autonomous heat gun intended for repair and maintenance of engineering networks. Obtaining of a good heat gun is ensured by the motor fan capable of generating a high-pressure jet without connection to an external electrical network. Using of the autonomous heat gun in the housing and communal services is very promising in comparison with similar devices.

친환경 환풍기를 위한 BLDC모터 제어기 연구

This study documents the 3-phase BLDC(Brushless DC) motor to improve conventional exhaust fan motor. Energy efficiency, noise, and air pollution reduction for the high-performance vibration of the BLDC motor has been used in many fields. It is necessary to achieve the information of rotor position for driving 3-phase type brushless DC motor. It is also necessary that the PWM control algorithm design for a MOSFET driver to control the motor speed control for each of three phases. BLDC motors for exhaust fan, we studied the controller and software. The control circuit and motor control program through which Exhaust fan up close and person can be used safely and protect the environment.

Solar Light Responsive Polymer Composites with Three Shape‐Memory Effects

Solar light responsive polymer composites which can deform their shape according to the variation in sunlight power density are prepared by incorporating the solar light photothermal filler of Sm0.5Sr0.5CoO3 (SSC) into crosslinked poly[ethylene‐ran‐(vinyl acetate)] (EVA). Dual shape‐memory effect, temperature‐memory effect, and reversible bidirectional shape‐memory effect are all achieved in such EVA‐SSC composites. Dual shape‐memory effect with fixation ratio over 99% and recovery ratio over 95% is presented, while the responsive power density is adjusted from 0.4 to 0.1 w cm−2 by simply decreasing the programming temperature from 140 to 50 °C. Furthermore, during a cyclic variation in power density from 0 to 0.3 w cm−2 and back to 0 w cm−2 in 6 min, the composite specimens show a reversible angle deformation. Finally, a sunlight‐adaptive circuit switch is demonstrated using such composites, automatically turning off the LED lamp and turning on the motor fan according to the sunlight power density. image

Comparing Brushless DC Motors: A Method of Suppressing the Shaft Voltage Even in a Grounded Motor Frame

The voltage-source pulsewidth modulation (PWM) inverter generally used to drive air-conditioning fans has posed a major problem, i.e., the high probability of electrical erosion of the bearing. Through inverter switching, a potential difference called the shaft voltage is generated between the inner and outer races, causing an electrical breakdown of the bearing lubricant. This results in a current, sometimes called the electric discharge machining current, passing through the bearing, which causes bearing erosion. The shaft voltage is reduced by the use of an insulator inserted between the outer and inner cores of the rotor in an air-conditioning fan motor where the frame is not grounded. This article describes the calculated and measured waveforms of the shaft voltage for the insulated rotor brushless dc (BLdc) motor driven by a PWM inverter. The insulated rotor also has the effect of suppressing the shaft voltage even when the motor frame is grounded.

Development of operation support methods of the drying plant within a cogeneration system

In the article on the basis of the proposed cogeneration system it is developed a method to support the functioning of the dryer at the level of decision-making for the production of pellet fuel. Prediction of changes in moisture content of air in measuring air temperature at the inlet to the heat exchanger for heating air maintains temperature and aerodynamic drying modes based on the change speed of the fan motor of the air with a heating medium consisting of a cogeneration unit. In the production of, for example, 5,8 ths of wood pellets per year is possible to provide 860 flats of 120 m 2 area by pellet fuel, which allows taking into account the frequency control of the fan motor of the air to reduce the production cost of electricity and heat in the range of 20-30 % to obtain saving money by using pellet fuel for heating and hot water supply up to 40 %.

Developing of Fuzzy Logic Controller for Air Condition System

uzzy logic control was developed to control the compressor motor speed , fan speed , fin direction and operation mode to maintain the room temperature at or closed to the set point temperature and save energy and keep devices from damage. This paper describes the development of Fuzzy logic algorithm for Air Condition control system. This system consists of four sensors for feedback control: first for input electric volt which used to save devices from damage due to alternated voltages, second for temperature and third for humidity and fourth for dew point. Simulation of the Fuzzy logic algorithm for Air Condition controlling system is carried out based on MATLAB.

ON-LINE PERFORMANCE ASSESSMENT AND FAULT DIAGNOSIS OF MECHANICAL SYSTEMS

This study integrates sensors, signal capture equipment, industrial computers and machinery health check-up software to develop an On-line Performance Assessment and Fault Diagnosis of Mechanical System, helping engineers predict mechanical conditions. Physical quantities captured by the sensors is utilized to process physical signals, and the Wavelet Packet Energy method is used for the feature extraction of non-stationary signals in coordination with the Principal Component Analysis for feature selection. This study establishes On-line Performance Assessment and Fault Diagnosis of Mechanical System based on Discriminant Analysis which is able to immediately determine the mechanical performance. When abnormal mechanical conditions occur, Bayesian Network will be activated to construct error diagnostic model and determine possible causes of error or malfunction of the machinery. Finally, the system is applied to the fan motor, high-speed spindle motor and AC motor of the machine tool. Experimental results show that the theory can effectively diagnose mechanical performance remarkable with an accuracy rate of 92.50% or higher.

Performance Analysis of Brushless DC Motor Drive for Air Conditioner

This paper presents an efficiency comparison and verification of two types of Brushless DC (BLDC) motors and drives combination. The trapezoidal BLDC motor is excited by trapezoidal drive and sinusoidal BLDC motor is excited by sinusoidal drive. In air conditioner fan motor system, the sinusoidal type of BLDC motor with sinusoidal drive is applied. However, the DC link voltage of the motor is high and thus demands for high power consumption. Furthermore, the sinusoidal drive use vector control which is complicated to be implemented and make the driver high cost. Therefore, further improvement in energy consumption and drive system is required by develop combination of trapezoidal BLDC motor with trapezoidal drive. Thus, these two combination motors and drives required for efficiency comparison. The motors drives are simulated by using MATLAB and then their efficiencies are measured. At the end of this paper, the results show that the trapezoidal BLDC motor with trapezoidal drive offers higher efficiency compared to sinusoidal BLDC motor with vector control drive. It indicates that the developed drive system is considerable to be applied in the air conditioner fan motor system.