User Manual

Table Of Contents
Brushless Motor Connections and Operation
114 Advanced Digital Motor Controller User Manual V2.1, December 3, 2020
Preparation for Automatic Sensor Setup
The rotor’s angle sensor is a critical element for good sinusoidal commutation. Wrong or
unstable angle reading can cause excessive current consumption, vibration, or even dam-
age. The sensor must be correctly and firmly attached to the motor so that it never slips
during operation. The table below shows the setup and calibration steps required for each
sensor type.
TABLE 8-1. Setup and calibration steps
Setup Encoder Hall
Hall+
Encoder SSI
Sin/
Cos Resolver
Min/Max Range Calibration No No No No Ye s Ye s
Zero reference search Yes(1) No No Ye s Ye s Ye s
Hall Position Mapping No Yes(2) Yes(2) No No No
Linearity Correction Map No(3) No No(3) Yes(3) Ye s Ye s
Sensor/Winding Order Ye s Ye s Ye s Ye s Ye s Ye s
Note 1: Zero reference search must be performed at every power-up for Encoder mode
Note 2: Hall position mapping is optional but recommended for best results
Note 3: Linearity Correction is optional for digital encoders
Sensor setup and calibration is generally a one-time procedure. Sensor information is
stored in the controller’s configuration and calibration flash.
Reference Search Power
During the automatic sensor setup phase, the controller will drive the motor coils with a
slow-changing three phase current, creating a rotating magnetic field inside the motor. The
rotor’s magnets are attracted to the field, causing the rotor to follow turn. For best accu-
racy the rotor is driven for a full turn in the forward direction, and another full turn in the
reverse direction.
For the reference search to work, the current that is injected into the motor must be
strong enough to pull the rotor in perfect alignment. The motor must not be loaded during
this sequence. For best results, the current should be set equal to the motor’s nominal
amps rating.
Enter the value in Amps s in the “Reference Seek Power” configuration menu in the Rob-
orun PC utility.
FIGURE 8-21. Reference Seek Power configuration
Or by sending the configuration command:
^SREF channel amps (in amps * 10)