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參數(shù)資料
| 型號： | AD2S100AP |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 數(shù)字信號處理外設(shè) |
| 英文描述： | AC Vector Processor |
| 中文描述： | 12-BIT, DSP-COORDINATE TRANSFORM PROCESSOR, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大小： | 393K |
| 代理商： | AD2S100AP |
AD2S100
REV. A
–10–
SIMPLE SLIP CONTROL
In an adjustable-frequency drive, the control strategy must en-
sure that motor operation is restricted to low slip frequencies,
resulting in stable operation with a high power factor and a high
torque per stator ampere. Figure 12 shows the block diagram of
simple slip control using the AD2S100. Here, the slip frequency
command
ω
2
and the current amplitude command are sent to
the microprocessor to generate two orthogonal signals, |I| Sin
θ
and |I| Cos
θ
here (
θ
=
ω
2
.) With the actual shaft position angle,
φ
, (resolver-to-digital converter) and the orthogonal signals from
INDAC
MTR
PWM
+
INVERTER
AD2S100
μPROC
AD2S80A RDC
(I) SET
SLIP
FREQ
I Sin
θ
I Cos
θ
Ia
Ib
Ic
RESOLVER
φ
ω
2
=
d
θ
dt
Figure 12. Slip Control of AC Induction Motor with
AD2S100
the
μ
P, the AD2S100 generates the inverter frequency and am-
plitude command into a three-phase format. The three-phase
sine wave reference currents are reproduced in the stator phases.
For general applications, both the steady-state and dynamic per-
formance of this simple control scheme is satisfactory. For de-
tailed information about this application, please refer to the
bibliography at the end of the data sheet.
ADVANCED PMSM SERVO CONTROL
Electronically commutated permanent magnet synchronous
motors (PMSM) are used in high performance drives for
machine tools and robotics. When a field orientated control
scheme is deployed, the resulting brushless drive has all the
properties required for servo applications in machine tool fed
drives, industrial robots, and spindle drives. These properties
include large torque/inertia ratio, a high peak torque capability
for fast acceleration and deceleration with high torsional stiff-
ness at standstill.
Figure 13 shows the AD2S100 configured for both forward and
reverse transformations. This architecture concludes both flux
and torque current components independently. The additional
control of Vd (flux component) allows for the implementation
of field weakening schemes and maintenance of power factor.
2/3
3/2
PMSM
INV +
PWM
AD2S100
AD2S100
AD2S82
ω
+
+
+
–
PI
ω
ref
Id
Iq
Idref
Iqref
Va
Vb
Vc
Vq
Vd
–
–
PI
PI
e
+j
φ
e
–j
φ
φ
Figure 13. PMSM Servo Control Using AD2S100
For more detailed information, please refer to the application
note “Vector Control Using a Single Vector Rotation Semicon-
ductor for Induction and Permanent Magnet Motors.”
MOTION CONTROL DSP COPROCESSOR
AC induction motors are superior to dc motors with respect to
size/power ratio, weight, rotor inertia, maximum rotating veloc-
ity, efficiency and cost for motor ratings greater than 5 HP.
However, because of nonlinear and the highly interactive multi-
variable control structure, ac induction motors have been con-
sidered difficult to control in applications demanding variable
speed and torque.
Field orientated control theory and practice, under development
since 1975, has offered the same level of control enjoyed by tra-
ditional dc machines. Practical implementation of these algo-
rithms involves the use of DSP and microprocessor based
architectures. The AD2S100 removes the needs for software
implementation of the rotor-to-stator and stator-to-rotor trans-
formations in the DSP or
μ
P. The reduction in throughput
times from typically 100
μ
s (
μ
P) and 40
μ
s (DSP) to 2
μ
s in-
creases system bandwidths while also allowing additional fea-
tures to be added to the CPU. The combination of the fixed
point ADSP-2101 and the AD2S100, the “advanced motion
control engine” shown in Figure 14, enables bandwidths previ-
ously attainable only through the use of floating point devices.
For more detailed information on the AD2S100 vector control
application and on this advanced motion control engine, please
refer to application notes “Vector Control Using a Single Vector
Rotation Semiconductor for Induction and Permanent Magnet
Motors.”
MEASUREMENT OF HARMONICS
Three-phase ac power systems are widely used in power genera-
tion, transmission and electric drive. The quality of the electric-
ity supply is affected by harmonics injected into the power main.
In inverter fed ac machines, fluxes and currents of various fre-
quencies are produced. Predominantly in ac machines the 5th
and 7th harmonics are the most damaging; their reaction with
the fundamental flux component produces 6th harmonic torque
pulsations. The subsequent pulsating torque output may result
in uneven motion of the motor, especially at low speeds.
The AD2S100 can be used to monitor and detect the presence
and magnitude of a particular harmonic on a three-phase line.
Figure 15 shows the implementation of such a scheme using the
AD2S100. Note, the actual line voltages will have to be scaled
before applying to the three-phase input of the AD2S100.
Selecting a harmonic is achieved by synchronizing the rotational
frequency of the park digital input,
φ
, with the frequency of the
fundamental flux component and the integer harmonic selected.
The update rate, r, of the counters is determined by:
r
=
4096
n
× ω
2
π
Here,
r
= input clock pulse rate (pulses/second);
n
= the order of harmonics to be measured;
ω
= fundamental angular frequency of the ac signal.
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