1066 HEIDENHAIN Technical Manual MANUALplus 620
Methods for
determining the
field angle
There are three methods for determining the field angle without motor motion
(rough determination):
Method 2: (MP_motFieldAdjustMove = mode 2)
Current pulses are output with the brakes applied, and the absolute rotor
position is determined from the reaction. A "minimum" movement of the
motor must be possible when the brakes are applied.
Method 3: (MP_motFieldAdjustMove = mode 3)
Functions in the same manner as Method 2, but with the difference that the
motor brakes are not applied. Therefore, this method is not suitable for
hanging axes. However, this method can lead to more exact results than
Method 2, so it should be used for synchronous spindles. Minimal spindle
movements can occur during field angle determination.
Method 4: (MP_motFieldAdjustMove = mode 4)
This new method was introduced for determining the field angle so that the
relationship between the position of the incremental encoder and the
position of the rotor magnets can be established even if there is
considerable noise in the encoder signals.
Use this method only in consultation with HEIDENHAIN!
In MP_motTypeOfFieldAdjust select the method to be used for
determining the absolute rotor position.
MP_motTypeOfFieldAdjust
Rough determination of the field angle without motor motion
Available from NCK software version: 597 110-02.
Format: Selection menu
Selection: If a precise value is available for the field-angle orientation, the
rough value is used until the axis has been referenced.
Methods of rough determination of the field angle:
mode 0
Recommended for all motors. Do not use for hanging axes!
mode 1
Reserved, do not use!
mode 2
Field angle determination with brake applied. A "minimum"
movement of the motor must be possible when the brakes are
applied.
mode 3
Like "mode 2" with the difference that the brake is opened. Not
suitable for hanging axes!
mode 4
Reserved. Use only in consultation with HEIDENHAIN.
(For very noisy encoder signals.)
Default: No value, parameter optional (initial value: mode 0)
Access: LEVEL3
Reaction: RESET
Standstill monitoring is active while determining the field angle. If it
responds for motors without motor brakes, increase the threshold in
MP_checkPosStandstill. Afterwards, reset MP_checkPosStandstill to
the original value.
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