Device for measuring the angle of rotation of an electric motor shaft

1973 ◽  
Vol 16 (1) ◽  
pp. 52-53
Author(s):  
A. L. Shte�ner ◽  
I. S. Pinchuk ◽  
B. K. Kavavashkin ◽  
A. Ya. �rgard
Keyword(s):  
Electric Motor ◽  
Motor Shaft ◽  
Angle Of Rotation

Fatigue Cracking of a 3-MW Electric Motor Shaft

2015 ◽  
Vol 15 (2) ◽  
pp. 211-218 ◽  
Author(s):  
S. W. Stafford ◽  
L. Trueba
Keyword(s):  
Electric Motor ◽  
Fatigue Cracking ◽  
Motor Shaft

scholarly journals Development of Wireless Technique to Regulate Seed Dropping in a Seeder for Intercropping

2021 ◽  
pp. 46-55
Author(s):  
Korla Harshavardhan ◽  
S. S. Sivakumar ◽  
J. John Gunasekar ◽  
K. Balaji ◽  
P. K. Padmanathan ◽  
...  
Keyword(s):  
Tamil Nadu ◽  
Unit Area ◽  
Total Power ◽  
Servo Motor ◽  
Motor Shaft ◽  
C Language ◽  
Rf Receiver ◽  
Rf Transmitter ◽  
Sole Cropping ◽  
Angle Of Rotation

Although intercropping gives additional yield per unit area than sole cropping, yield may also decrease as the crops differ in their competitive abilities. To avoid competition and to accompany complimentary action between the base crop and inter crop in intercropping practise, proper crop ratio of two crops should be maintained. When sowing with available seeders crop ratio was not maintained because of non-availability of a seed hopper, handling two different varieties of seeds and the un controlled seed flow from the hopper to the seed tube when ground wheel is rotating. To look after this problem an experiment was conducted at DFMPE, AEC & RI, Tamil Nadu Agricultural University, Kumulur by fabricating a seed hopper consisting of two compartments and circular shaped outlet for two variety of seeds and developing an RF (radio frequency) wireless technology to control servo motor in order to restrict the seed drop from seed hopper to the seed tube even though ground wheel is in running condition. In this paper considering a seven-row seeder, the performance of a micro controller coded with appropriate programme in embedded C language which can regulate seven servo motors each at seven seed hoppers, functioning of RF transmitter sketch, functioning of RF receiver sketch, header issue & its solution, angle conversion of servo shaft and power consumption was observed and discussed. Total power required for operating RF electronic setup containing seven servomotors was recorded as 5 V 12 A. The angle of rotation of servo motor shaft was from 0º to 165º when pulse width range in micro controller was set from 0 and 2400 micro seconds. The servo did not respond in the hardware interfacing because both the libraries use timer 1 interrupt which created an error issue. In order to overcome that “Servo timer 2.h” header was issued instead of servo.h. Then sketch was compiled and was executed successfully.

scholarly journals Rancang Bangun Aplikasi Jam Tangan Pranata Laboratorium Pendidikan dengan Kemampuan Waterpas Tiga Dimensi untuk Mengatur Sambungan Modul Uji Pembebanan Motor

2020 ◽  
Vol 2 (2) ◽  
pp. 89-100
Author(s):  
Mochammad Darwis ◽  
Aris Eko Saputro
Keyword(s):  
Electric Motor ◽  
Two Dimensions ◽  
Electric Machine ◽  
Three Dimensions ◽  
Gyro Sensor ◽  
Electric Driving ◽  
Orientation Sensor ◽  
Rule Out ◽  
Angle Of Rotation

When testing the loading of an electric machine, we often experience problems in finding a tool to see the precision of the connection between the shaft of an electric machine. Shaft connections that are not straight and not right in the middle can damage the shaft of the rotating engine and the engine being rotated. This research is the development of previous research that uses Android phone as a tool. By reading the value of the orientation sensor on an android phone, we can measure the angle of rotation on the x, y and z axes. The Watpasdroid application will display the value on each axis. This application has also been used in the Electric Driving Laboratory at the Surabaya State Electronic Polytechnic (PENS), to check the connection (coupling) between an electric motor and a magnetic load (dynamo meter). The size of a cellphone that is still too large is sometimes become a problem  if the surface being measured is narrow. So we uses a wristband-shaped watch module that already has a gyro sensor and can be programmed according to our need. The size is almost 1/12 of ordinary cellphones. The M5Stick-C module is used to compare the gyro reading value displayed by the wristband. To test the quality of motor joint which  flatness checks have been assisted by using a wristband, a thermal observation camera is used. This application, does not rule out, can be used in other laboratories for the purpose of checking the plane levelness or equality in two dimensions or three dimensions.

Case Study: Consecutive Failure of Lube Oil Cooler Fans Coupling

2021 ◽  
Author(s):  
Arumugampillai Manikandan ◽  
Zeeshan Anwar
Keyword(s):  
Centrifugal Compressor ◽  
Electric Motor ◽  
Normal Operation ◽  
Internal Diameter ◽  
Motor Shaft ◽  
Shear Plate ◽  
Oil Cooler ◽  
Air Cooler ◽  
Gear Box ◽  
Locking Screw

Abstract Do we analyze on why can even the most reliable turbomachinery are getting failure and stopped? In some cases, it's all about bad installation or design literally. This paper explores the challenges one site had with repeated failure of lube oil fin fan coolers coupling which caused the unit availability of more than 3 months. It outlines the troubleshooting attempts made to remedy this issue, its root cause, and the resulting solution. This issue occurred at a site with a train configuration of motor driven centrifugal compressors. The plant lube oil system has been configured with 3 trains. Each train has been configured with Main electric motor + Vorecon Gearbox + Low Pressure centrifugal compressor + High Pressure centrifugal compressor. Lube oil system of the train has been configured as 2 lube oil coolers and 2 working oil coolers. Lube oil coolers are having fins with air cooler type. Air is supplied by fin fans and each train has 2 lube oil cooler fans and 2 working oil cooler fans. In total site has 3 trains x 4 fin fans so it has 12 fin fan cooler fans. All cooler fans are driven by electric motor which is coupled with gearbox and gear box is connected with cooler fan. During normal operation of working oil cooler fan A- stopped rotation suddenly from normal operation. During investigation, motor shaft was found running freely. No movement was seen on cooler fan. Coupling between motor to gearbox was inspected. Coupling is shear plate coupling. Its spacer flexible element were found broken into several pieces. Further investigation revealed that motor coupling hub was moving free axially back and forth due to clearance between motor shaft to coupling hub internal diameter. Motor side Coupling hub bolt hole was found with loss of material and ovality in shape. Hub locking Allen screw was found in damaged condition. Missing materials were noted and broken shear plate materials were found around coupling guard area. While site team was conducting the investigation on the unit A, similar incident occurred in next unit and other 3 units with 2 days difference between them. During detailed investigation it has been noted that all motor to gear box coupling are shear plates and shear plates were broken. Coupling hub was found loose and coupling hub locking screw was found broken or partial damage.

scholarly journals Sensorless Control of a Three-Section Permanent Magnet Valve Electric Motor

2019 ◽  
pp. 20-34
Author(s):  
V.N. Enin ◽  
An.V. Stepanov
Keyword(s):  
Electric Motor ◽  
Sensorless Control ◽  
Rotational Frequency ◽  
Voltage Source ◽  
Phase System ◽  
Constant Voltage ◽  
Two Phase ◽  
Wide Range ◽  
Effectiveness And Efficiency ◽  
Angle Of Rotation

A method of sensorless control of a three-section valve electric motor with 120-degree commuting windings is proposed. The commuting of the windings is carried out when the back-EMF of the section to be disconnected and connected is equal; the third section is connected to a constant voltage source. In this case, the electromagnetic torque of the motor varies slightly. The commuting times are determined using a function depending on the ratio of back-EMF of the section to be disconnected and connected. This function does not depend on the rotational frequency and can be used in a wide range of speeds. The angle of rotation of the rotor and the rotational frequency for controlling the motor are determined after converting the equations of the motor to a two-phase system. An example of starting the motor with the transition to a sensorless control system commuting windings is given. The effectiveness and efficiency of the method are confirmed by modeling a low-power three-section valve electric motor in the MATLAB&Simulink system using the SimPowersystems extension.

scholarly journals Power antenna radar with variable speed

2015 ◽  
pp. 81-87
Author(s):  
V. F. Strelkov ◽  
M. V. Andryushin ◽  
V. V. Vanyev
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Electric Drive ◽  
Electric Motor ◽  
Permanent Magnets ◽  
Performance Characteristics ◽  
Variable Speed ◽  
Motor Shaft ◽  
Radar Antenna ◽  
And Control

A mathematical model of the "mains - regulated electric drive" radar antenna us with a synchronous motor with permanent magnets. Peculiarities of work at a controlled electric variable speed electric motor shaft. A method and control system with motorized adjustable mechanical and electronic scanning of the antenna, improving performance characteristics of radar stations.

Small Electric Motor for Amateurs

1891 ◽  
Vol 31 (783supp) ◽  
pp. 12510-12511
Author(s):  
George M. Hopkins
Keyword(s):  
Electric Motor

An Interesting Static Electric Motor

1913 ◽  
Vol 108 (1) ◽  
pp. 11-11
Author(s):  
H. B. Dailey
Keyword(s):  
Electric Motor

CONVERTING THE VEHICLE BY REPLACING THE INTERNAL COMBUSTION ENGINE

2019 ◽  
pp. 29-35
Author(s):  
Oleksandr Gryshchuk ◽  
Volodymyr Hladchenko ◽  
Uriy Overchenko
Keyword(s):  
Internal Combustion Engine ◽  
Electric Vehicle ◽  
Electric Motor ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Environmental Safety ◽  
Environmental Conservation ◽  
Sales Forecasts ◽  
Financial Investments ◽  
Near Future

This article looks at some comparative statistics on the development and use of electric vehicles (hereinafter referred to as EM) as an example of sales and future sales forecasts for EM in countries that focus on environmental conservation. Examples of financial investments already underway and to be made in the near future by the largest automakers in the development and distribution of EM in the world are given. Steps are taken to improve the environmental situation in countries (for example, the prohibition of entry into the city center), the scientific and applied problem of improving the energy efficiency and environmental safety of the operation of wheeled vehicles (hereinafter referred to as the CTE). The basic and more widespread schemes of conversion of the internal combustion engine car (hereinafter -ICE) to the electric motor car (by replacing the gasoline or diesel electric motor), as well as the main requirements that must be observed for the safe use and operation of the electric vehicle. The problem is solved by justifying the feasibility of re-equipment of the KTZ by replacing the internal combustion engine with an electric motor. On the basis of the statistics collected by the State Automobile Transit Research Institute on the number of issued conclusions of scientific and technical expertise regarding the approval of the possibility of conversion of a car with an internal combustion engine (gasoline or diesel) to a car with an electric motor (electric vehicle), the conclusions on the feasibility of such conclusion were made. Keywords: electricvehicles, ecological safety, electricmotor, statistics provided, car, vehicle by replacing.

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