User Manual

Table Of Contents
Brushless Motor Connections and Operation
104 Advanced Digital Motor Controller User Manual V2.0, July 8, 2019
Configuring the Controller for Sinusoidal Commutation
Sinusoidal mode is selected via the Switching Mode configuration menu in the Roborun
PC utility..
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.
0
0
0
22.5
45
45
45
67.5
90
90
90
112.5
135
135
135
157.5
180
180180
202.5
225
225
225
247.5
27
0
270
270
292.5
315
315
315
337.5
Electrical Degrees
Mechanical Degrees
FIGURE 8-9. Mechanical vs electrical degrees
See “Determining the Number of Poles” on page 92 for details on how to determine the
number of pole pairs and configuring the controllers.
The number must be entered using the Number of Pole Pairs menus in the in the Roborun
PC utility..