Abstract
Previously, a dynamic model and a simulation program for series wound DC motors (SWDCM) were developed in MATLAB/Simulink for modelling them in electric vehicles and mechatronic systems. The electromagnetic characteristics of the motor (electric resistances, dynamic inductances), which serve as input parameters of the program, were also measured. Additionally, locked rotor response measurements were performed to test the accuracy of the measured electromagnetic characteristics. This paper presents the experimental procedure and the results of dynamics test measurements that were performed on the same motor, including the procedure for the determination of the necessary input dynamic parameters for the simulation. While the motor spins up from rest, the intensity of the electric current and the angular speed of the rotor are measured. Finally, the simulation and dynamic test results are compared to check the proper operation of the simulation program.
Highlights
A depending on the moment inertia on the rotor) the form of a sharp peak and approaching a constant loading moment of After inertia the intensive rotor) inincrease, the form a sharp peak androtor value of about theon initial theofangular speed of the approaching a constant value of about
The proper operation and accuracy of our simulation program for series wound DC motors were checked by dynamic test measurements
The percentage of accuracy of the simulated current intensities related to the measured ones is varied between 93–99%, in all cases, while regarding the angular speed between 96–99%, which validate our simulation program
Summary
The nominal values of the tested and modelled SWDCM were as follows: type: DC/T448; power: 4 kW; torque: 14.7 Nm; RPM: 2800 1/min; voltage: 48 V; current: 104 A. The friction (bearing plus brush friction) and loading torques on the rotor of the self-dynamic inductances of the stator and rotor windings, and Lga (I) ismotor their are denoted by Mload (ω ) Mell (ω ) Mres and Mload respectively, and Jm denotes the rotor’s mutual-dynamic inductance [11,16]. Electric resistances R a R g , Rr , Rwire , brush voltage Ubrush , and torques Mload , and Mres are defined in the simulation program as constants, while dynamic inductances Ls ( I ), Lr ( I ), Lsr ( I ), and battery voltage Ubatt (t) are given in the form of “Lookup Tables”.
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