Synchronous Reluctance Motor (Syncrm) - Eaton PowerXL DB1 Installation Manual

2 Engineering
2.8 Three-phase motors

2.8.5 Synchronous reluctance motor (SyncRM)

38
￫
In order to use vector control with brushless DC motors, the
values for parameters P-60, P-61, and P-62 on DB1 variable
frequency drives need to be adjusted:
• Set the value for P-60 to 3 ("Brushless DC motor speed
control").
• Set P-61 to 1 ("Motor Identification").
Automatic auto-tuning to determine the motor parameter
during downtime.
• P-62 ("MSC gain"). Adjust the gain factor for the speed
controller.
Synchronous reluctance motors have the same configuration as a three-
phase asynchronous motor. In order to prevent eddy currents, their rotor is
made of a soft magnetic material such as electrical steel, and in general
terms can have one of two different sheet cross-sections.
In the case of reluctance motors intended to be run as grid-connected sys-
tems, the rotor additionally features a rotor cage (similar to that used in asyn-
chronous motors). This cage makes it possible for the motor to start asyn-
chronously on the grid until it synchronizes ("falls into step") to it and is able
to follow the rotating field.
In the case of reluctance motors with a rotor that features salient poles with
flux directing sections and flux barrier sections, a variable frequency drive
with sensorless vector control is required. This combination makes it possi-
ble to have a rotor speed that is synchronous with the rotating field and
achieve optimum operation even when there are load changes. The losses in
the rotor are virtually negligible here.
Compared to a standard asynchronous motor, this synchronous reluctance
motor is more effective and achieves international efficiency standard IE4.
These are primarily used in rotating equipment in process engineering invol-
ving pumps, fans, compressors, and turbines, as well as mixers, centrifuges,
and conveyor systems.
￫
In order to use vector control with synchronous reluctance
motors, the values for parameters P-60, P-61 and P-62 on DB1
variable frequency drives need to be adjusted:
• Set the value for P-60 to 4
("SyncRel motor speed control").
• Set P-61 to 1 ("Motor Identification").
Automatic auto-tuning to determine the motor parameter
during downtime.
• P-62 ("MSC Gain"): Adjust the gain factor for the speed
controller.
DB1 Variable Frequency Drives 09/17 MN040031EN www.eaton.com