6
6.16 Rotor position synchronization/rotor position identification
6-615
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SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
6.16
Rotor position synchronization/rotor position identification
Drive converters with field–orientated closed–loop control impress the
current into permanent–magnet synchronous motors to establish the
magnetic flux in the motor.
At power–on, the rotor position identification automatically determines
the absolute rotor position using the maximum of the magnetic flux.
The rotor position identification is used for:
Determining the rotor position (coarse synchronization and fine syn-
chronization)
Supports commissioning when determining the commutation angle
offset
Two techniques can be used for the rotor position identification routine:
A technique based on saturation
A technique based on movement (from SW 6.1).
The particular technique can be selected using parameter P1075.
Determining the rotor position
The rotor position identification routine automatically determines the
motor rotor position. This means that the motor encoder does not re-
quire any additional position information from the encoder (C/D track).
For linear motors, Hall sensors are not required if the limitations and
secondary conditions are maintained.
Passing–over the zero mark
As a result of the accuracy of the identification technique, the rotor
position which has been determined can be accepted at the zero for
the fine synchronization.
Encoder adjustment is not required if the rotor position identification
routine is used for coarse and fine synchronization.
I
n P1011, bit 12 (identify coarse position) is set in order that the rotor
position identification technique is initiated when powering–up the drive.
If bit 13 is set (fine position identification), a rotor position identification
is executed independently of bit 12.
Description
Coarse
synchronization
Fine
synchronization
Equivalent of
the encoder
adjustment
Configuration,
actual value
sensing motor
encoder
6 Description of the Functions
08.02