User Manual

Table Of Contents
Brushless Motor Connections and Operation
108 Advanced Digital Motor Controller User Manual V2.1, December 3, 2020
When used on motors with a high number of pole pairs, single pole sensors will measure
the electrical angle with degrading resolution as the number of motor poles is higher. For
example, a single pole sensor with 1o resolution on a 10 pole motor will produce an elec-
tric angle evaluations with 10o resolution, which will result in less than optimal operation.
To resolve this problem, some absolute sensors are available in multiple pole versions.
In that case, the sensor will outputs a 0-360 angle value multiple times during a full turn.
Note that the controller will not work if the number of sensor poles is higher than the
number of motor poles.
Enter the number of Sensor Poles in the SinCos/SSI Sensor Poles configuration menu in
the Roborun PC utility.
FIGURE 8-15. Sin/Cos/SSI Sensor Poles configuration
Or by sending the configuration command:
^SPOL ch poles
You can determine or verify the number of sensor poles by following these steps:
1 Set Motor Poles to 1
2 Launch the Calibration/Setup
3 Make one full rotation of the motor shaft by hand and monitor the Angle value reported
in Roborun Utility.
4 Check how many times the Angle range (0-511) rolls over. This gives the number of sen-
sor poles.
5 Restore the correct values of motor and sensor poles
6 Launch the Calibration/Setup again
Important Notice
The number of motor poles and sensor poles are very important configuration pa-
rameters in sinusoidal mode. Using the wrong values will produce erratic behavior
and possibly damage.
Selecting and Configuring Supported Angle Sensors
In order for the proper voltage and phase to be applied to each of the 3 motor wires, the
rotor angular position must be known with precision at all times. Roboteq controllers sup-
port several sensors for achieving this.
Then select the method for capturing the rotor angle of the rotor as the motor spins. This
is done using the Sinusoidal Angle Sensor configuration menu in the utility.