Highlights of work:

• evaluates 145 thermal parameters of a DC motor,

• Digital Twin includes over 3000 lines of Matlab code,

• testing on a real-time machine Speedgoat Performance. For this application, a Matlab real-time simulation code was implemented in Simulink,

• verification by experimental data (in progress)

• calculated parameters from the thermal model will be further used in the calculation of the insulation resource and the remaining useful life (RUL) calculation.

 

Development goals:

• exclusion of physical sensors from windings and rotating parts

• increase in temperature measurement points

The DC motor is used in metallurgical production.

 

Scope of work for developing a dynamic thermal model of the DC motor 2П-24 / 104-7.1:

• ventilation calculation,

• thermal models of the nodes.

The tasks of the ventilation calculation are:

       1) determining the flow rate of cooling air through the channels of the electric motor

       2) determination of the coefficients of heat transfer from cooling surfaces to air.

The ventilation calculation is carried out for the operating speed range (50 ... 250 rpm), which makes it possible to obtain the values ​​of the heat transfer coefficients and the flow rates of the cooling air through the channels.

Model-Based Design was used for developing the Digital Twin of the heat condition of DC motor.

 

DC motor parameters:

• 7100 kW, 250 rpm

• 825 V, 9050 А,

• excitation 100 V, 390 А.

 

Input data to Digital Twin:

• DC motor inlet air temperature

• DC motor outlet air temperature (used to correct the calculation)

• Armature current

• Excitation current

• Rotation frequency

 

Output (estimated) data:

• Temperature of the armature winding element in the package (13 parameters)

• Temperature of the packages and the frontal part of the armature winding (2 parameters)

• Temperature of the frontal part of the armature winding on the air supply side (1 parameter)

• Temperature of the frontal part of the armature winding on the side of the collector (1 parameter)

• Temperature of the armature winding element in the area between the core and the band from the air supply side (1 parameter)

• Temperature of the armature winding element in the area between the core and the band from the collector side (1 parameter)

• Temperature of the armature winding element in radial ventilation ducts (12 parameters)

• Temperature rise of the armature winding, calculated according to GOST (by resistance) (1 parameter)

• Temperature of the armature winding element minimum (1 parameter)

• Temperature of the armature winding element maximum (1 parameter)

• Temperature of the excitation winding element temperature (13 parameters)

• Temperature rise of the excitation winding, calculated according to GOST (by resistance) (1 parameter)

• Temperature of the excitation winding element minimum (1 parameter)

• Temperature of the excitation winding element maximum (1 parameter)

• Temperature of the frontal part of the excitation winding from the air supply side (1 parameter)

• Temperature of the frontal part of the excitation winding from the collector side (1 parameter)

• Temperature of the compensation winding elements (13 parameters)

• Temperature rise of the compensation winding, calculated according to GOST (by resistance) (1 parameter)

• Temperature of the compensation winding elements minimum (1 parameter)

• Temperature of the compensation winding elements maximum (1 parameter)

• Temperature of the frontal part of the compensation winding from the air supply side (1 parameter)

• Temperature of the frontal part of the compensation winding from the  collector side(1 parameter)

• Temperature of the additional poles winding elements (13 elements)

• Temperature rise of the winding of the additional poles, calculated according to GOST (by resistance) (1 parameter)

• Temperature of the winding of the additional poles minimum (1 parameter)

• Temperature of the winding of the additional poles maximum (1 parameter)

• Temperature of the frontal part of the winding of the additional poles on the air supply side (1 parameter)

• Temperature of the frontal part of the winding of the additional poles from the collector side (1 parameter)

• Collector temperature (1 parameter)

• Temperature of the motor winding cockerels(1 parameter)

• Temperature of the motor winding equalizer (1 parameter)

• DC motor outlet air temperature (1 parameter)