Identification of electrical machines

To control an electrical machine or to estimate its motion states, a dynamical model is frequently used. For the purpose of identifying this model, several test setups are used at our lab. These tests include the standstill frequency-response testing, tests during rotation as well as several dynamic tests.


Identification of permanent-magnet synchronous machines

This research is focused on the identification of enhanced Park models which include saturation and magnetic interaction between the orthogonal magnetic axes for permanent magnet machines.

Standstill frequency-response testing of a permanent-magnet machine

For the purpose of dynamical modelling a test signal with variable frequency can be used. Instead of sweeping the frequency, frequency-response testing can be obtained more rapidly by using a multisinus test signal. Such a signal has been generated by using a three phase linear amplifier  and measured by a VXI data-acquisition system.

Identification tests are performed by using a switching converter also. As the permanent-magnet machine will be driven by an inverter, these identification procedures use signals that resemble the supply signals used during normal operation.

Testing during rotation

By synchronizing the permanent magnet machine to the grid en by using an adjustable transformer and a DC machine, the active and reactive power of the permanent-magnet machine can be controlled. Controlling the stator current during rotation allows to identify models that include magnetic saturation.

Dynamic testing

Dynamic testing can be performed by short circuiting the stator windings of a permanent magnet synchronous generator. As it is important to short-circuit the three phases simultaneously, the use of a three-phase invertor has been used. Other tests include measuring the respons on variations in the load torque. 


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