Description: 使用V/F原理的交流电机控制和简单的PWM算法
交流电机在连接到电源时只能以其额定速度运转，所以要改变转速必须改变电源频率。本篇应用文档展示了这些技术如何在AT90PWM3上简单的被实现，也说明了AVR RISC微处理器在电源控制方面的应用。-Induction motors can only run at their rated speed when they are connected to the main power supply. This is the reason why variable frequency drives are needed to vary the rotor speed of an induction motor. The aim of this application note is to show how these techniques can be easily implemented on a AT90PWM3, an AVR RISC based microcontroller dedicated to power control applications. Platform: |
Size: 404480 |
Author:ECN |
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Description: Direct torque control is one method used in variable frequency drives to control the torque (and thus
finally the speed) of three-phase AC electric motors. This involves a calculation of the motor s
magnetic flux and torque based on the measured voltage and currents of the motor. Platform: |
Size: 340992 |
Author:popamino |
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Description: File 1: THIS CODE IS USED TO DRAW THE PUMP CURVES AT DIFFERENT PUMP SPEED
1: PUMP CURVE
2: EFFICIENCY CURVE
3: BREAK HORSEPOWER CURVE
4: KW-INPUT CURVE
File 2: THIS CODE IS FOR APPLYING THE WAY OF CALCULATING THE EFFICIENCY, POWER
AND KW-INPUT FOR VARIABLE SPEED PUMP AT A GIVEN DESIRED HEAD AND DESIRED
FLOW AS SHOWN IN THE PAPER TITLED:
" how to calculate the pump efficiency and power for variable speed pump"
File 3: this code is to correct the use of affinity law by shifting the curve to
intersect with the system-curve at the desired flow as shown in the
paper titled:
"The Correct Method of Calculating Energy Savings to Justify Adjustable-Frequency Drives on Pumps"
-File 1: THIS CODE IS USED TO DRAW THE PUMP CURVES AT DIFFERENT PUMP SPEED
1: PUMP CURVE
2: EFFICIENCY CURVE
3: BREAK HORSEPOWER CURVE
4: KW-INPUT CURVE
File 2: THIS CODE IS FOR APPLYING THE WAY OF CALCULATING THE EFFICIENCY, POWER
AND KW-INPUT FOR VARIABLE SPEED PUMP AT A GIVEN DESIRED HEAD AND DESIRED
FLOW AS SHOWN IN THE PAPER TITLED:
" how to calculate the pump efficiency and power for variable speed pump"
File 3: this code is to correct the use of affinity law by shifting the curve to
intersect with the system-curve at the desired flow as shown in the
paper titled:
"The Correct Method of Calculating Energy Savings to Justify Adjustable-Frequency Drives on Pumps"
Platform: |
Size: 6144 |
Author:sim |
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Description: 电动机的单片机控制，主要介绍步进电机细分驱动和无刷、变频驱动器-SCM motor control, mainly on the stepper motor subdivision drive and brushless, variable frequency drives, etc. Platform: |
Size: 6225920 |
Author:坐山观海 |
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Description: The number of industry applications in which induction motors are fed by static frequency inverters is growing fast and, although much has already been done within this field, there is still a lot to be studied/understood
regarding such applications. The advance of variable speed drives systems engineering increasingly leads to the
need of specific technical guidance provision by electrical machines and drives manufacturers, In this project we have studied and developed a simulink model with PWM inverter and find out the various characteristics and analysis them. Platform: |
Size: 23552 |
Author:Ayoub |
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Description: AC motor drives are widely used to control the speed
of conveyor systems, blower speeds, pump speeds, machine tool
speeds, and other applications that require variable speed with
variable torque. The complete system consists of an ac voltage input
that is put through a diode bridge rectifier to produce a dc output
which across a shunt capacitor, this will, in turn, feed the PWM
inverter. Platform: |
Size: 475136 |
Author:hmod |
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Description: Variable speed drives with Pulse Width Modulation are increasingly applied in many new industrial
applications for more efficient performance. Recently, developments in power electronics and semiconductor
technology have lead to widespread use of power electronic converters in the power electronic systems. A number of
Pulse width modulation (PWM) schemes are used to obtain variable voltage and frequency supply from a three-phase
voltage source inverter. Among the different PWM techniques proposed for voltage fed inverters, the sinusoidal PWM
technique has been popularly accepted. But there is an increasing trend of using space vector PWM (SVPWM) because
of their easier digital realization, reduced harmonics, reduced switching losses and better dc bus utilization. This paper
focuses on step by step development of SVPWM implemented on a PMBLDC motor. Simulation results are obtained
using MATLAB/Simulink environment for effectiveness of the stud Platform: |
Size: 1032192 |
Author:hmod |
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Search - variable frequency drives