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參數(shù)資料
| 型號： | AD2S105 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Three-Phase Current Conditioner |
| 中文描述： | 三相電流調(diào)節(jié)器 |
| 文件頁數(shù)： | 5/12頁 |
| 文件大小： | 292K |
| 代理商： | AD2S105 |
AD2S105
REV. 0
–5–
THEORY OF OPERATION
A fundamental requirement for high quality induction motor
drives is that the magnitude and position of the rotating air-gap
rotor flux be known. This is normally carried out by measuring
the rotor position via a position sensor and establishing a rotor
oriented reference frame.
To generate a flux component in the rotor, stator current is ap-
plied. A build-up of rotor flux is concluded which must be
maintained by controlling the stator current, i
ds
, parallel to the
rotor flux. The rotor flux current component is the magnetizing
current, i
mr
.
Torque is generated by applying a current component which is
perpendicular to the magnetizing current. This current is nor-
mally called the torque generating current, i
qs
.
To orient and control both the torque and flux stator current
vectors, a coordinate transformation is carried out to establish a
new reference frame related to the rotor. This complex calcula-
tion is carried out by the AD2S105.
To expand upon the vector operator a description of a single
vector rotation is of assistance. If it is considered that the
moduli of a vector is OP and that through the movement of ro-
tor position by
f
, we require the new position of this vector it
can be deduced as follows:
Let original vector OP = A (Cos
u
+ jSIN
u
) where
A
is a
constant;
if
OQ
= OP e
j
F
and: e
j
F
= Cos
f
+ jSin
f
OQ = A (Cos
(
u
+
f
)
+ jSin
(
u
+
f
))
=
A
[
Cos
u
Cos
φ
–
Sin
u
Sin
φ
+
jSin
u
Cos
φ
+
jCos
u
Sin
φ
]
=
A
[(
Cos
u
+
jSin
u
) (
Cos
f
+ j
Sin
f
)]
(1)
(2)
θ
φ
θ
+
φ
Q
P
O
a
d
Figure 1. Vector Rotation in Polar Coordinate
The complex stator current vector can be represented as i
s
= i
as
j
2
π
3
placed by rectangular coordinates as
i
s
= i
ds
+ ji
qs
In this equation i
ds
and i
qs
represent the equivalent of a two-
phase stator winding which establishes the same magnitude of
MMF in a three-phase system. These inputs can be seen after
the three-phase to two-phase transformation in the AD2S105
block diagram. Equation (3) therefore represents a three-phase
to two-phase conversion.
+ ai
bs
+ a
2
i
cs
where a = e
and a
2
= e
j
4
π
3
. This can be re-
(3)
To relate these stator current to the reference frame the rotor
currents assume the same rectangular coordinates, but are now
rotated by the operator e
j
f
, where e
j
f
= Cos
f
+ jSin
f
.
Here the term vector rotator comes into play where the stator
current vector can be represented in rotor-based coordinates or
vice versa.
The AD2S105 uses e
j
f
as the core operator. In terms of the
mathematical function, it rotates the orthogonal i
ds
and i
qs
com-
ponents as follows:
i
ds
' + j
i
qs
' = (
I
ds
+
jI
qs
)
e
j
f
where i
ds
', i
qs
' = stator currents in the rotor reference frame. And
e
j
f
=
Cos
f
+
jSin
f
= (
I
ds
+
jI
qs
)(
Cos
f
+
jSin
f
)
The output from the AD2S105 takes the form of:
i
ds
' =
I
ds
Cos
f
–
I
qs
Sin
f
i
qs
' =
I
ds
Sin
f
+
I
qs
Cos
f
The matrix equation is:
[
i
ds
'
]
i
qs
'
=
[
Cos
f
Sin
f
–
Sin
f
] [
Cos
f
I
ds
]
I
qs
and it is shown in Figure 2.
I
ds
I
qs
I
ds
'
I
qs
'
φ
e
j
φ
Figure 2. AD2S105 Vector Rotation Operation
DIGITAL
LATCH
3
φ
TO 2
φ
TRANSFORMATION
LATCH
LATCH
SINE AND
COSINE
MULTIPLIER
(DAC)
SINE AND
COSINE
MULTIPLIER
(DAC)
PARK
COS
θ
COS
θ
+ 120
°
COS
θ
+ 240
°
SIN
θ
INPUT CLARK
COS (
θ + φ)
SIN (
θ + φ)
Figure 3. Converter Operation Diagram
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PDF描述 |
|---|---|
| AD2S105AP | ECONOLINE: RD & RC - Dual Output from a Single Input Rail- 1kVDC & 2kVDC Isolation- Power Sharing on Output- Custom Solutions Available- UL94V-0 Package Material- Efficiency to 86% |
| AD2S1200 | 12-Bit R/D Converter with Reference Oscillator |
| AD2S1200WST | 12-Bit R/D Converter with Reference Oscillator |
| AD2S1200YST | 12-Bit R/D Converter with Reference Oscillator |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD2S105AP | 制造商:AD 制造商全稱:Analog Devices 功能描述:Three-Phase Current Conditioner |
| AD2S110 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Converter IC |
| AD2S1200 | 制造商:AD 制造商全稱:Analog Devices 功能描述:12-Bit R/D Converter with Reference Oscillator |
| AD2S1200WST | 制造商:Analog Devices 功能描述:Resolver to Digital 12-Bit Parallel/Serial (3-Wire, SPI) 制造商:Analog Devices 功能描述:IC 12BIT ADC REF OSC SMD 2S1200 |
| AD2S1200WSTZ | 功能描述:IC R/D CONV W/REF OSCIL 44-LQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 類型:數(shù)據(jù)采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數(shù)據(jù)接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數(shù)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(yīng)商設(shè)備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
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