Permanent-field synchronous motors

The nameplate data of the motor must be entered during the startup of synchronous motors:

• Nominal motor speed
• Nominal motor current
• Nominal motor voltage
• Nominal motor torque
• Nominal motor frequency or number of poles
• Maximum motor currentEstimated during startup, if not specified. or maximum torque at the motor shaftEstimated during startup, if not specified.
• Optional:
• Phase inductanceEstimated during startup, if not specified.
• Internal voltageEstimated during startup, if not specified.
• Mass moment of inertiaIs estimated at startup, if not specified.

In the case of permanent-field synchronous motors without an encoder, a parameter measurement must then be carried out with FCB 25.

In the case of synchronous motors with an encoder, SEW-EURODRIVE recommends carrying out the parameter measurement.

The brake is released (if present) during the measurement to align the rotor electrically. Make sure that the rotor can turn freely. For this reason, the motor must be separated from the gear unit or system.

In the case of synchronous motors with an encoder, the encoder offset must also be set after the above-mentioned startup procedure. This commutation takes place using the "Rotor position identification" function (FCB 18). The rotor turns during the rotor position identification. Make sure that the rotor can turn freely. For this reason, the motor must be separated from the gear unit or system.