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Advanced Motor Control Applications
Are you considering moving to brushless motors or
sinusoidal control, eliminating costly sensors or adding PFC?
Sensorless Field Oriented Control (FOC)
Are you looking for top of the line dynamic torque response
and ef?ciency, and the lowest system cost motor control
solution?
The dsPIC DSC provides a cost effective and highly ef?cient
solution to this complex algorithm. The fast and accurate
on-chip A/D module samples the motor voltage and currents.
In software, Clarke and Park transformations transform
the A/D information to feed two PI loops controlling torque
and ?ux. Rotor speed and position are determined by an
estimator which models the motor. The outputs of the PI
loops are transformed using Space Vector Modulation to
control the Motor Control PWM Module’s PWM outputs.
Sinusoidal (180°) outputs provide smoother, quieter motor
operation.
Digital PFC and Sensorless FOC with Field Weakening
+
PMSM/BLDC:
■ Field weakening runs the motor at several times the rated
motor speed
■ Adaptive ?ltering for the estimator reduces the time spent
on motor tuning
■ PFC brings the voltage and current back into phase,
reducing the power required
■ Sliding Mode Observer (SMO) or Phase Locked-Loop (PLL)
estimator
■ Single-Shunt or Dual-Shunt phase current measurement
ACIM:
■ Field weakening runs the motor at several times the rated
motor speed
■ Phase Locked-Loop (PLL) estimator
■ Dual-Shunt phase current measurement
1Φ
AC
Bridge
Rectifier
Boost Converter
-
V DCREF
+
+
V DC
Voltage
Control
+
+
+
V AC
+
+ +
I AC
PWM
Current
Control
N REF
-
Σ
PI
Field
Weakening
I Q REF
I D REF
-
Σ
-
Σ
PI
PI
V Q
V D
θ
D , Q
α , β
V α
V β
SVM
3 Phase
Bridge
1
V AVG
D , Q
I α
α , β
Ia
I Q
V AC
V AVG
I D
α , β
I β
A , B , C
Ib
Power Factor Correction (PFC)
Motor
Position
Speed
Position and
Speed
Estimator
V α
V β
Sensorless Field Oriented Control (FOC) System
www.microchip.com/motor
5
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