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參數資料
型號: AD7874
廠商: Analog Devices, Inc.
英文描述: 4-Channel, 12-Bit Simultaneous Sampling Data Acquisition System(LC2MOS 4通道,12位同時采樣DAS)
中文描述: 4通道,12位同時采樣數據采集系統(LC2MOS 4通道,12位同時采樣DAS)的
文件頁數: 12/16頁
文件大小: 427K
代理商: AD7874
AD7874
REV. C
–12–
APPLIC AT IONS
Vector Motor Control
T he current drawn by a motor can be split into two compo-
nents: one produces torque and the other produces magnetic
flux. For optimal performance of the motor, these two compo-
nents should be controlled independently. In conventional
methods of controlling a three-phase motor, the current (or
voltage) supplied to the motor and the frequency of the drive are
the basic control variables. However, both the torque and flux
are functions of current (or voltage) and frequency. T his cou-
pling effect can reduce the performance of the motor because,
for example, if the torque is increased by increasing the fre-
quency, the flux tends to decrease.
Vector control of an ac motor involves controlling phase in addi-
tion to drive and current frequency. Controlling the phase of the
motor requires feedback information on the position of the rotor
relative to the rotating magnetic field in the motor. Using this
information, a vector controller mathematically transforms the
three phase drive currents into separate torque and flux compo-
nents. T he AD7874, with its four-channel simultaneous sam-
pling capability, is ideally suited for use in vector motor control
applications.
A block diagram of a vector motor control application using the
AD7874 is shown in Figure 17. T he position of the field is de-
rived by determining the current in each phase of the motor.
Only two phase currents need to be measured because the third
can be calculated if two phases are known. Channel 1 and
Channel 2 of the AD7874 are used to digitize this information.
Simultaneous sampling is critical to maintain the relative phase
information between the two channels. A current sensing isola-
tion amplifier, transformer or Hall effect sensor is used between
the motor and the AD7874. Rotor information is obtained by
measuring the voltage from two of the inputs to the motor.
Channel 3 and Channel 4 of the AD7874 are used to obtain this
information. Once again the relative phase of the two channels
is important. A DSP microprocessor is used to perform the
mathematical transformations and control loop calculations on
the information fed back by the AD7874.
VOLTAGE
ATTENUATORS
DAC
DAC
DAC
TORQUE
SETPOINT
FLUX
SETPOINT
IN1
V
V
IN4
V
IN3
V
IN2
*ADDITIONAL PINS OMITTED FOR CLARITY
TORQUE & FLUX
CONTROL LOOP
CALCULATIONS &
TWO TO THREE
PHASE
INFORMATION
TRANSFORMATION
TO TORQUE &
FLUX CURRENT
COMPONENTS
DRIVE
CIRCUITRY
ISOLATION
AMPLIFIERS
AD7874*
DSP
MICROPROCESSOR
I
C
I
B
I
A
V
B
V
A
PH3
MOTOR
Figure 17. Vector Motor Control Using the AD7874
相關PDF資料
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AD7878SQ IC 1:10 CLOCK DRIVER 20-QSOP
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相關代理商/技術參數
參數描述
AD7874AN 功能描述:IC DAS 12BIT 4CH LC2MOS 28-DIP RoHS:否 類別:集成電路 (IC) >> 數據采集 - ADCs/DAC - 專用型 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數據采集系統(DAS) 分辨率(位):16 b 采樣率(每秒):21.94k 數據接口:MICROWIRE?,QSPI?,串行,SPI? 電壓電源:模擬和數字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP(6x6) 包裝:托盤
AD7874ANZ 功能描述:IC DAS 12BIT 4CH LC2MOS 28-DIP RoHS:是 類別:集成電路 (IC) >> 數據采集 - ADCs/DAC - 專用型 系列:- 產品培訓模塊:Data Converter Basics 標準包裝:1 系列:- 類型:電機控制 分辨率(位):12 b 采樣率(每秒):1M 數據接口:串行,并聯 電壓電源:單電源 電源電壓:2.7 V ~ 3.6 V,4.5 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:100-TQFP 供應商設備封裝:100-TQFP(14x14) 包裝:剪切帶 (CT) 其它名稱:296-18373-1
AD7874ANZ 制造商:Analog Devices 功能描述:IC 12-BIT ADC
AD7874AQ 功能描述:IC DAS 12BIT 4CH 5V 28-CDIP RoHS:否 類別:集成電路 (IC) >> 數據采集 - ADCs/DAC - 專用型 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數據采集系統(DAS) 分辨率(位):16 b 采樣率(每秒):21.94k 數據接口:MICROWIRE?,QSPI?,串行,SPI? 電壓電源:模擬和數字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP(6x6) 包裝:托盤
AD7874AR 功能描述:IC DAS 12BIT 4CH LC2MOS 28-SOIC RoHS:否 類別:集成電路 (IC) >> 數據采集 - ADCs/DAC - 專用型 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數據采集系統(DAS) 分辨率(位):16 b 采樣率(每秒):21.94k 數據接口:MICROWIRE?,QSPI?,串行,SPI? 電壓電源:模擬和數字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP(6x6) 包裝:托盤
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