3.1.3.1 Motor and gear settings
3.1.3.1.1 Motor Configuration
The servo drive needs several motor parameters to operate correctly. They can usually be found in the motor
datasheet and are entered in the corresponding objects via the “OBLAC Drives” configuration wizard.
3.1.3.1.1.1 Pole pairs
In a three-phase PM motor, the number of poles depends on the rotor design and shows how many “south”
and “north” magnetic poles exist. These magnetic poles are created by permanent magnets which are built
into the rotor structure.
This number can be found in the motor’s datasheet.
Attention
If the number given in the datasheet is not designated as Pole pairs but Poles, it must be converted:
Number of pole pairs = Number of poles
3.1.3.1.1.2 Torque constant
The torque constant is the ratio between generated torque and the phase current amplitudes. The torque
constant unit is in [µNm / A ]. The motor torque constant can be found in the motor’s datasheet.
If in the motor datasheet, the unit of torque constant is in [Nm / A ], the following equation can be used to
convert the unit of torque constant to [µNm / A ]:
rms
peak
rms
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