AN2357 Freescale Semiconductor / Motorola, AN2357 Datasheet - Page 5

• Manufacturer Part Number: AN2357
• Description: Sine Voltage Powered 3-Phase Permanent Magnet Motor with Hall Sensor
• Manufacturer: Freescale Semiconductor / Motorola

Vector of Stator
Current is Kept 90°
Relative to the
Vector of Rotor
Permanent Magnet
Flux
Voltage Vector is
Kept in the Direction
of the Current Vector
MOTOROLA
Sine Voltage Powered 3-Phase Permanent Magnet Motor with Hall Sensor
This situation is shown in
optimal torque is generated when the stator current vector is placed 90° relative
to the rotor permanent magnet flux space vector. In this case, the maximal
utilization of the motor’s magnetic is obtained. The control strategy requires
current measurement.
This situation is shown in
vector in the direction of the voltage vector. In this case, the electrical losses
are minimized. Current measurement is also required.
Figure 4. Voltage Vector is Kept in the Direction of the Current Vector
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 3. Stator Current is 90° Relative to Rotor Flux
Go to: www.freescale.com
U
U
s
s
j
ω
j
ω
.L
.L
s
Figure
Figure
.I
s
R
I
.I
s
s
R
E
I
s
s
s
I
E
s
s
90°
I
s
3. As can be seen from
4. This control strategy keeps the current
Ψ
Ψ
s
s
Ψ
Ψ
Ψ
Ψ
r
r
Equation 3
Target Motor Theory
the
AN2357/D
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