
1.START-UP FANUC BUILT-IN SPINDLE MOTOR Bis series B-65280EN/05
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1.5 MAGNETIC POLE DETECTION
1.5.1 Overview
To control the synchronous built-in spindle motor, information about
the magnetic pole position (phase) of the rotor is needed. Operation
for detecting the magnetic pole position (phase) of the rotor is referred
to as magnetic pole detection. Immediately after the power is turned
on or if magnetic pole position information is lost for a cause such as
an alarm, magnetic pole detection needs to be performed before the
motor can be driven.
Two magnetic pole detection modes are available:
• Automatic mode (usable with 9D53/C edition or later and
9D70/B edition or later)
• Direct current activation mode
By setting the phase difference between the magnetic pole position
(phase) of the rotor and the one-rotation signal generation position
beforehand in a parameter, control can be exercised using a
parameter-set offset value and one-rotation signal position as
reference data after one-rotation signal detection (AMR offset
function).