User Manual

Table Of Contents
Sinusoidal Commutation
Advanced Digital Motor Controller User Manual 109
The proper operation of the Sin/Cos sensor can be verified by plotting in real time the volt-
ages of the sin and cos signals inside the Diagnostic tab of the PC utility
FIGURE 8-10. Diagnostic Tab with Auto Setup
Or using the following queries.
?ASI [channel]
Sin/cos sensors require a one-time setup and calibration. See Automatic Sensor Setup”
on page 1 0 7.
Important Warning
The Tuning Fault LED will be on in the Roborun screen and the motor will NOT start
if the Sin/Cos has not been setup/calibrated.
Important Notice
Electrical noise on the sensor output will cause wrong angle readings. Shield the
wires and keep them as far as possible from the motor wires. If noise persists, add a
10nF to 100nF ceramic capacitor between the input pin and ground pin on the con-
troller’s connector
Synchro Resolver
Synchro Resolvers are a form of Sine/Cosine sensor based on transformer technology. It
is composed of a fixed primary coil, and two secondary coils positioned at 90o from each
other and that rotate with the rotor. A fixed frequency excitation voltage is fed in the pri-
mary. As the secondary coils turn, and take turn being parallel with the fixed primary, the
voltage amplitude induced in each varies as shown in the figure below.