A New High Speed Frequency Conversion Grating Torque Measurement System

2011 ◽  
Vol 105-107 ◽  
pp. 1885-1888
Author(s):  
Hao Zhao ◽  
Hao Feng
Keyword(s):  
Measurement System ◽  
High Speed ◽  
Frequency Conversion ◽  
Good Accuracy ◽  
Frequency Converter ◽  
Torque Sensor ◽  
Torque Measurement ◽  
Three Phase ◽  
Accuracy Of Measurement ◽  
Hardware Test

It is difficult to measure torque of high speed rotating machinery, a new mechanical structure torque sensor based on three phase asynchronous is designed, and combined with frequency conversion, a new frequency conversion Torque Measurement system is constucted. The sensor shaft and rotor are separated by bearing, for the accuracy of torque measurement, controlling frequency converter to make the speed difference of sensor shaft and rotor constant. This measurement system based on Filed Programmable Gate Array in signal processing, SCM in data processing and frequency converter controlling, and realize non-contract torque measurement. According to the results of the hardware test, indicated this measurement system is realizable. The good accuracy of measurement system is verified accord to the test, the fiducial error is .

scholarly journals Design and Experimental Research of Agricultural Low Power Singlephase Frequency Conversion Control System Based on SPWM

2015 ◽  
Vol 9 (1) ◽  
pp. 490-495
Author(s):  
Chuanlai Yuan ◽  
Lingshuang Kong ◽  
Can Hu ◽  
Weilong Zhou
Keyword(s):  
Low Power ◽  
Power Supply ◽  
Rational Design ◽  
Single Phase ◽  
Frequency Conversion ◽  
Frequency Converter ◽  
Ac Motor ◽  
Ac Power ◽  
Three Phase ◽  
Power Frequency

In the countryside of China, the main power supply mode is 220V single-phase power, which affects the widely application of three-phase agricultural appliances. What’s more, it means a block to the development of modern agriculture. However, frequency converter technique research is focused on three-phase high power frequency conversion technology at present, and there are very few achievements on the agricultural low power single-phrase frequency conversion research. In this paper, considering the difficulty of widely application of agricultural low power three-phase AC motor because it is not easy to obtain the three-phase power supply, a three-phase AC frequency conversion system under the condition of agricultural 220V single-phase AC power is designed, which can achieve the stepless regulation of the voltage amplitude and guarantee the widely use of the three-phase AC motor under the condition of agricultural 220V singlephase AC power. The experimental results show that the system can output the controlled three-phase AC power when the input is 220V single-phase AC power. And the rational design of the system hardware also provides the technical support for the application of agricultural low power frequency conversion.

Development of Contactless Torque Sensor Based on SAW Resonators

2019 ◽  
Author(s):  
Wei Han ◽  
Xiongzhu Bu ◽  
Yihan Cao ◽  
Miaomiao Xu
Keyword(s):  
Measurement System ◽  
High Reliability ◽  
Transmission System ◽  
Torque Sensor ◽  
Torque Measurement ◽  
Sensing Element ◽  
Differential Measurement ◽  
Saw Devices ◽  
Calibration Experiment ◽  
Saw Resonators

Abstract This paper presents a wireless clamp-on torque sensor based on dual or quad one-port SAW resonators to meet the measurement requirements of transmission system. Firstly, the principle of clamp-on torque sensor is introduced, the mechanical model of the structure is calculated and simulated by theoretical analysis and COMSOL. The differential measurement method is confirmed, and the optimal structure parameters are studied. Then, the torque sensitive theory of SAW devices is analyzed, the differential SAW torque sensing elements and the measurement system are designed based on the frequency division multiple access (FDMA). And a novel sensing element installation method is proposed, which reduces the installation error influence on sensor accuracy. Finally, the clamp-on structure prototype and measurement system are verified by the static calibration experiment. The results show that: the torque sensor has the capability that 1.931 KHz/Nm of sensitivity under ±100 Nm with good linearity and consistency. The torque sensor has the advantages of wireless, non-contact, easy installation, high reliability, and easy maintenance, it is suitable for the torque measurement of transmission system.

Steady-state modelling method for matrix-reactance frequency converter with boost topology

2011 ◽  
Vol 60 (2) ◽  
pp. 137-148
Author(s):  
Igor Korotyeyev ◽  
Beata Zięba
Keyword(s):  
Fourier Series ◽  
Steady State ◽  
Differential Equations ◽  
Numerical Method ◽  
Frequency Converter ◽  
Double Fourier Series ◽  
Galerkin’S Method ◽  
Galerkin's Method ◽  
Modelling Method ◽  
Three Phase

Steady-state modelling method for matrix-reactance frequency converter with boost topologyThis paper presents a method intended for calculation of steady-state processes in AC/AC three-phase converters that are described by nonstationary periodical differential equations. The method is based on the extension of nonstationary differential equations and the use of Galerkin's method. The results of calculations are presented in the form of a double Fourier series. As an example, a three-phase matrix-reactance frequency converter (MRFC) with boost topology is considered and the results of computation are compared with a numerical method.

Direct Current Deadbeat Predictive Controller for BLDC Motor Using Single DC-Link Current Sensor

2020 ◽  
Vol 38 (8A) ◽  
pp. 1187-1199
Author(s):  
Qaed M. Ali ◽  
Mohammed M. Ezzalden
Keyword(s):  
Control System ◽  
High Speed ◽  
Fast Response ◽  
Bldc Motor ◽  
Current Controller ◽  
Three Phase ◽  
Predictive Controller ◽  
Two Phases ◽  
Dc Current ◽  
Three Phase Inverter

BLDC motors are characterized by electronic commutation, which is performed by using an electric three-phase inverter. The direct control system of the BLDC motor consists of double loops; including the inner-loop for current regulating and outer-loop for speed control. The operation of the current controller requires feedback of motor currents; the conventional current controller uses two current sensors on the ac side of the inverter to measure the currents of two phases, while the third current would be accordingly calculated. These two sensors should have the same characteristics, to achieve balanced current measurements. It should be noted that the sensitivity of these sensors changes with time. In the case of one sensor fails, both of them must be replaced. To overcome this problem, it is preferable to use one sensor instead of two. The proposed control system is based on a deadbeat predictive controller, which is used to regulate the DC current of the BLDC motor. Such a controller can be considered as digital controller mode, which has fast response, high precision and can be easily implemented with microprocessor. The proposed control system has been simulated using Matlab software, and the system is tested at a different operating condition such as low speed and high speed.

scholarly journals Optimization of Air Gap Length and Capacitive Auxiliary Winding in Three-Phase Induction Motors Based on a Genetic Algorithm

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4407
Author(s):  
Mbika Muteba
Keyword(s):  
Genetic Algorithm ◽  
Design Process ◽  
Power Factor ◽  
High Speed ◽  
High Efficiency ◽  
Air Gap ◽  
Element Analysis ◽  
Three Phase ◽  
High Torque ◽  
Cage Induction Motor

There is a necessity to design a three-phase squirrel cage induction motor (SCIM) for high-speed applications with a larger air gap length in order to limit the distortion of air gap flux density, the thermal expansion of stator and rotor teeth, centrifugal forces, and the magnetic pull. To that effect, a larger air gap length lowers the power factor, efficiency, and torque density of a three-phase SCIM. This should inform motor design engineers to take special care during the design process of a three-phase SCIM by selecting an air gap length that will provide optimal performance. This paper presents an approach that would assist with the selection of an optimal air gap length (OAL) and optimal capacitive auxiliary stator winding (OCASW) configuration for a high torque per ampere (TPA) three-phase SCIM. A genetic algorithm (GA) assisted by finite element analysis (FEA) is used in the design process to determine the OAL and OCASW required to obtain a high torque per ampere without compromising the merit of achieving an excellent power factor and high efficiency for a three-phase SCIM. The performance of the optimized three-phase SCIM is compared to unoptimized machines. The results obtained from FEA are validated through experimental measurements. Owing to the penalty functions related to the value of objective and constraint functions introduced in the genetic algorithm model, both the FEA and experimental results provide evidence that an enhanced torque per ampere three-phase SCIM can be realized for a large OAL and OCASW with high efficiency and an excellent power factor in different working conditions.

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