User Manual

Table Of Contents
Sinusoidal Commutation
Advanced Digital Motor Controller User Manual 103
Rotor Angle
Sensor
Direction
A
mplitude
3-Phases PWM Generator
+/-90o
U
V
W
FIGURE 8-8. Simplified 3-phase sinusoidal model
As the motor turns, the phase on each wire is changed in order for the magnetic field to
always be perpendicular, and therefore create the maximum radial force to the rotor.
90
o
90
o
FIGURE 8-8. Magnetic field perpendicular to rotor magnets
The principle benefit of sinusoidal commutation is the quiet, rumble-free, motor operation
resulting from the smoothly rotating and always aligned magnetic field.
However, sinusoidal commutation is more complex to configure, calibrate, tune and oper-
ate. For best and fastest results it is recommended that you follow these step rigorously:
1- Configure the Controller for Sinusoidal Commutation (page 100)
2- Select and Configure a Supported Angle Sensors (page 102)
4- Prepare for Automatic Sensor Setup (page 107)
5- Run the Automatic Sensor Setup (page 110 )
6- Set, Test and Troubleshoot FOC-Field Oriented Control