How to configure a Synchronous Reluctance motor with Altivar series?
Hello, let's have a look today at how to commission a simple synchronous reluctance motor.
From the stator point of view, this type of motor is similar to synchronous
but the rotor characteristics are completely different.
The rotor is made of several metal leaves shaped like this and its principle is using the reluctance properties to make the rotor turn.
The path of reluctance is equivalent to resistance in electricity,
the field will go over the minimum reluctance and then the rotor will align according to the stator field.
To summarize this kind of commissionning, we could say that for basic applications, the startup can be broken down into three steps:
Enter motor characteristics, make an autotune,
and finally improve the system behavior if necessary according to the application.
the latter step will not be described in this video.
First of all, the settings list is available in the programming manual in motor parameters MPA,
Commissionning is performed thanks to 6 parameters :
first choosing CTT (for motor control assignment to Synchronous Reluctant motor)
then 5 simple settings such as nCrS (for nominal current), here 2.1 Ampere,
nSPS (for motor speed), here 1500,
tqS (for nominal torque), here 4.8 Newtonmeter,
PPnS (for number of poles), here 2 pair of poles,
and finally ASt (for automatic angle setting type), here Rotational Current Injection.
You can see on the screen that when a setting is modified, a tool icon appears in front of all modified parameters.
Then finally, Tune optimizes motor performance at low speed,
which also helps for estimation of motor torque
and allows better accuracy of estimated values in sensorless operations.
In order to have the highest performance level, we propose to perform a tune while the motor is rotating.
This option is available by setting TUNT parameter to 'Rotation'.
Let's start the tune in rotation.
It is possible to start autotuning via the menu or the 'Apply' button.
A small noise and a slight rotation of the motor will occur
before the motor starts rotating for a longer period of time to measure all necessary motor parameters.
This rotation is done at approximately half the nominal speed.
At the end of tune, it is necessary to refresh to read the final data, result of autotune.
In addition to these basic parameters, there are around a dozen additional ones available
such as nCrS,nSPS, tqS, PPns, ASt, rSAS, LdS, LqS, MCr, CrtF and CrFA.
This video will not go into details on each and everyone of them but keep in mind that these can be used to fine tune the settings.
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