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PDF AD2S100 Data sheet ( Hoja de datos )
| Número de pieza | AD2S100 | |
| Descripción | AC Vector Processor | |
| Fabricantes | Analog Devices | |
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a
AC Vector Processor
AD2S100
FEATURES
Complete Vector Coordinate Transformation on Silicon
Mixed Signal Data Acquisition
Three-Phase 120؇ and Orthogonal 90؇ Signal
Transformation
Three-Phase Balance Diagnostic–Homopolar Output
APPLICATIONS
AC Induction and DC Permanent
Magnet Motor Control
HVAC, Pump, Fan Control
Material Handling
Robotics
Spindle Drives
Gyroscopes
Dryers
Washing Machines
Electric Cars
Actuator
Three-Phase Power Measurement
Digital-to-Resolver & Synchro Conversion
GENERAL DESCRIPTION
The AD2S100 performs the vector rotation of three-phase 120
degree or two-phase 90 degree sine and cosine signals by trans-
ferring these inputs into a new reference frame which is controlled
by the digital input angle φ. Two transforms are included in the
AD2S100. The first is the Clarke transform which computes
the sine and cosine orthogonal components of a three-phase
input. These signals represent real and imaginary components
which then form the input to the Park transform. The Park
transform relates the angle of the input signals to a reference
frame controlled by the digital input port. The digital input
port is a 12-bit parallel binary representation.
If the input signals are represented by Vds and Vqs, respectively,
where Vds and Vqs are the real and imaginary components, then
the transformation can be described as follows:
Vds' = Vds Cosφ – Vqs Sinφ
Vqs' = Vds Sinφ + Vqs Cosφ
Where Vds' and Vqs' are the output of the Park transform
and Sinφ, and Cosφ are the values internally derived by the
AD2S100 from the binary digital data.
The input section of the device can be configured to accept
either three-phase inputs, two-phase inputs of a three-phase
system, or two 90 degree input signals. The homopolar output
detects the imbalance of a three-phase input only. Under nor-
mal conditions, this output will be zero.
FUNCTIONAL BLOCK DIAGRAM
Cosθ Sinθ
INPUT
DATA
STROBE
φ POSITION
PARALLEL
DATA
12 BITS
Ia
Cosθ
Ib
Cos (θ + 120°)
Cos (θ + 240°) Ic
Sinθ
SINE AND
SECTOR COSINE
Vds MULTIPLIER MULTIPLIER
30-20
Vqs
SECTOR
MULTIPLIER
SINE AND
COSINE
MULTIPLIER
BUSY
Vds'
2φ -3φ
Vqs'
Va Cos θ + φ
Vb Cos (θ + 120° + φ)
Vc Cos (θ + 240° + φ)
Sin θ + φ
CONV1
CONV2
DECODE
Ia + Ib + Ic
3
HOMOPOLAR HOMOPOLAR +5V GND –5V
OUTPUT
REFERENCE
The digital input section will accept a resolution of up to 12 bits
(AD2S100). An input data strobe signal is required to synchro-
nize the position data and load this information into the device
counters. A busy output is provided to identify the conversion
status of the AD2S100. The busy period represents the conver-
sion time of the vector rotation.
Two analog output formats are available. A two-phase rotated
output facilitates multiple rotation blocks. Three phase format
signals are available for use with a PWM inverter.
PRODUCT HIGHLIGHTS
Hardware Peripheral for Standard Microcontrollers and
DSP Systems
The AD2S100 removes the time consuming cartesian transfor-
mations from digital processors and benchmarks a speed im-
provement of 30:1 on standard 20 MHz processors. AD2S100
transformation time = 2 µs (typ).
Field Oriented Control of AC and DC Brushless Motors
The AD2S100 accommodates all the necessary functions to
provide a hardware solution for ac vector control of induction
motors and dc brushless motors.
Three-Phase Imbalance Detection
The AD2S100 can be used to sense overcurrent situations or
imbalances in a three-phase system via the homopolar output.
Resolver-to-Digital Converter Interface
The AD2S100 provides general purpose interface for position
sensors used in the application of dc brushless and ac induction
motor control.
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
1 page  
AD2S100
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
reference frame that can be related to stator current coordinates.
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, ids, parallel to the
rotor flux. The rotor flux current component is the magnetizing
current, imr.
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, iqs.
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 AD2S100 vector processor.
To expand upon the vector operator a description of a single
vector rotation is of assistance. If it is considered that the mod-
uli of a vector is OP and that through the movement of rotor
position by , we require the new position of this vector it can
be deduced as follows:
Let original vector OP = A (Cos + jSIN ) where A is a
constant;
so if OQ = OP ej
and: ej = Cos + jSin
(1)
OQ = A (Cos ( + ) + jSin ( + ))
= A [Cos Cos φ – Sin Sin φ + jSin Cos φ + jCos Sin φ]
= A [(Cos + jSin ) (Cos + jSin )]
(2)
a
Q
θ+φ
φ
P
θ
d
O
To relate these stator current to the reference frame the rotor
currents assume the same rectangular coordinates, but are now
rotated by the operator ej, where ej = Cos + jSin .
Here the term vector rotator comes into play where the stator
current vector can be represented in rotor-based coordinates or
vice versa.
The AD2S100 uses ej as the core operator. Here represents
the digital position angle which rotates as the rotor moves. In
terms of the mathematical function, it rotates the orthogonal ids
and iqs components as follows:
ids' + jiqs' = (Ids + jIqs) ej
where ids', iqs' = stator currents in the rotor reference frame. And
ej = Cos + jSin
= (Ids + jIqs)(Cos + jSin )
The output from the AD2S100 takes the form of:
ids' = Ids Cos – Iqs Sin
iqs' = Ids Sin + Iqs Cos
The matrix equation is:
[ ] [ ] [ ]ids' = Cos – Sin
iqs' Sin Cos
Ids
Iqs
and it is shown in Figure 2.
φ
ids ids'
ejφ
iqs iqs'
Figure 2. AD2S100 Vector Rotation Operation
INPUT CLARK
COSθ COSθ + 120° COSθ + 240° SINθ
3φ + 2φ
TRANSFORMATION
Figure 1. Vector Rotation in Polar Coordinate
The complex stator current vector can be represented as is = ias
+ aibs + a2ics where a = e
j 2π and a2 = e
3
j 4π . This can be re-
3
placed by rectangular coordinates as
is = ids + jiqs
(3)
In this equation ids and iqs 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 AD2S100
block diagram. Equation (3) therefore represents a three-phase
to two-phase conversion.
DIGITAL
φ
LATCH
LATCH
LATCH
SINE AND
COSINE
MULTIPLIER
(DAC)
SINE AND
COSINE
MULTIPLIER
(DAC)
Cos(θ + φ)
2φ–3φ
Cos(θ +(120° + φ))
Cos(θ +(240° + φ))
PARK
OUTPUT CLARK
Figure 3. Converter Operation Diagram
REV. A
–5–
5 Page 
HOST COMPUTER
AD2S100
VECTOR
COPROCESSOR
ADC
DAC
VECTOR
COPROCESSOR
AD2S100
AD7874
ADSP-2101/
ADSP-2105
DAC-8412
AD2S100
INV
+
PWM
INDUCTION
MOTOR
ia, ib, ic
θ AD2S80A
R/D
CONVERTER
Figure 14. Advanced Motion Control Engine
The magnitude of the n-th harmonic as well as the fundamental
component in the power line is represented by the output of the
low-pass filter, ak. In concert with magnitude of the harmonic
the AD2S100 homopolar output will indicate whether the
three phases are balanced or not. For more details about this
application, refer to the related application note listed in the
bibliography.
AD2S100
Va Vd Vd1 LOW PASS ak
Vb
TWO-TO-THREE
CLARK
e–jφ PARK
FILTER
Vc TRANSFORMATION Vq TRANSFORMATION Vq1
AD2S80A
MSB
MSB-1
.
.
.
MSB – (n–1)
.
.
.
LSB + (n–1)
n = POLES
.
.
.
.
12,14 OR 16-BIT RESOLUTION MODE
AD2S100
MSB
MSB-1
MSB-2
.
.
.
.
.
.
.
LSB
HOMOPOLAR
OUTPUT
12-BIT UP/DOWN
COUNTER
PULSE INPUTS
DIRECTION
Figure 15. Harmonics Measurement Using AD2S100
MULTIPLE POLE MOTORS
For multi-pole motor applications where a single speed resolver
is used, the AD2S100 input has to be configured to match the
electrical cycle of the resolver with the phasing of the motor
windings. The input to the AD2S100 is the output of a resolver-
to-digital converter, e.g., AD2S80A series. The parallel output
of the converter needs to be multiplied by 2n–1, where
n = the number of pole parts of the motor. In practice this is
implemented by shifting the parallel output of the converter left
relative to the number of pole pairs.
Figure 16 shows the generic configuration of the AD2S80A with
the AD2S100 for a motor with n pole pairs. The MSB of the
AD2S100 is connected to MSB-(n-1) bit of the AD2S80A digi-
tal output, MSB-1 bit to MSB-(n-2) bit, . . ., LSB bit to LSB
bit of AD2S80A, etc.
Figure 16. A General Consideration in Connecting R/D
Converter and AD2S100 for Multiple Pole Motors
Figure 17 shows the AD2S80A configured for use with a four
pole motor, where n = 2. Using the formula described the MSB
is shifted left once
AD2S80A
AD2S100
(MSB) BIT1
MSB
BIT2
MSB-1
..
..
..
.
.
.
.
.
.
.
.
.
BIT13
(LSB) BIT14
.
.
.
.
LSB
14-BIT RESOLUTION MODE
Figure 17. Connecting of R/D Converter AD2S80A and
AD2S100 for Four-Pole Motor Application
REV. A
–11–
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AD2S100.PDF ] | |
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