Absolute encoder/resolver
Rotor
N
S
The autophasing routine is performed with permanent magnet synchronous motors
and synchronous reluctance motors in the following cases:
1. One-time measurement of the rotor and encoder position difference when an
absolute encoder, a resolver, or an encoder with commutation signals is used
2. At every power-up when an incremental encoder is used
3. With open-loop motor control, repetitive measurement of the rotor position
at every start
4. When the position of the zero pulse must be measured before the first start
after power-up.
Note: In closed-loop control, autophasing is performed automatically after the
motor identification run (ID run). Autophasing is also performed automatically
before starting when necessary.
In open-loop control, the zero angle of the rotor is determined before starting. In
closed-loop control, the actual angle of the rotor is determined with autophasing
when the sensor indicates zero angle. The offset of the angle must be determined
because the actual zero angles of the sensor and the rotor do not usually match.
The autophasing mode determines how this operation is done both in open-loop
and closed-loop control.
The rotor position offset used in motor control can also be given by the user – see
parameter 98.15. Note that the autophasing routine also writes its result into this
parameter. The results are updated even if user settings are not enabled by 98.1.
Note: In open-loop control, the motor always turns when it is started as the shaft
is turned towards the remanence flux.
Bit 4 of 6.21 indicates if the rotor position has already been determined
90 Program features
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