10
8902/RE Resolver Speed Feedback Option
Motor Phasing
The control of PMAC brushless motors is allowed if the relative position between the stator and
the rotor is well known. The resolver must be set up to define the relative position between the
resolver and the 3 motor phases. For the 890 drive, the convention is as follows :
♦
when the motor runs in a clockwise direction, looking to the front shaft of the motor, the 3
successive phases are M1, M2 and M3 as shown below.
Motor phasing
0
90
180
270
360
electrical po sition
M1 phase
M2 phase
M3 phase
♦
The resolver must be adjusted in a way to give a position of 0 degrees when the M1 motor
phase crosses the 0 Volt line in a rising variation. For example, a 6 pole motor associated
with a 2 pole resolver will give the following curves:
-200
-150
-100
-50
0
50
100
150
200
0
90
180
270
360
position(degree)
M1 phase
