User Manual

Table Of Contents
Brushless Motor Connections and Operation
106 Advanced Digital Motor Controller User Manual V2.1, December 3, 2020
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
Configuring the Controller for Sinusoidal Commutation
Sinusoidal mode is selected via the Switching Mode configuration menu in the Roborun
PC utility..
FIGURE 8-12. Sinusoidal configuration
Or by sending the configuration command:
^BMOD channel 1
Configuring the Number of Motor Pole Pairs
The number of Motor Pole Pairs is a critical parameter for sinusoidal combination. A full
3-phase cycling of motor’s electromagnets will cause the rotor to move to the next per-
manent magnet pole. A full 3-phase cycle is known as electrical turn which will be differ-
ent from the physical (mechanical) turn of the shaft if the motor number of pole pairs is
greater than one. The figure below show the relationship between mechanical degree and
electrical degree in the case of a two pole pairs motor.