AN2357 Freescale Semiconductor / Motorola, AN2357 Datasheet - Page 17

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

MOTOROLA
Sine Voltage Powered 3-Phase Permanent Magnet Motor with Hall Sensor
The designed application has the control angle δ calculated from speed,
Equation
speed (e.g., ventilators).
where:
The tuning of control angle with speed is not critical. This is because the range
of acceptable angles is comparable with the range of optimal angles over the
whole torque and speed range. Increasing the control angle with speed allows
a higher torque in maximal speed. In the application, the minimal and maximal
control angles are:
•
•
•
•
•
Freescale Semiconductor, Inc.
For More Information On This Product,
δ is the control angle (angle between motor voltage and rotor torque)
δ
δ
δ
δ
δ
base
max
base
max
90
C
=
δ
13, and is suitable for applications where the torque depends on
=
is the control angle when speed is maximal
= 122°
δ
is the control angle when speed is zero
= 101°
base
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δ
--------------------------- -
max
+
ω
–
max
C
100
Figure 14. Measured Reactive Power
δ
δ
base
⋅
ω
for Different Torque and Speed
control angle
110
120
130
Software Design
Equation 13
Equation 14
w2_T3
w1_T3
w2_T2
w1_T2
w2_T1
w1_T1
AN2357/D
17