Motor Factory – Test area

Working point – Constant Speed – U-N

Positioning and objective

The aim of the test “Working point – Constant Speed – U-N” is to characterize the behavior of the machine when operating at constant speed connected to an external circuit composed of a DC voltage source and a parasitic impedance.
Note: The working point is mainly imposed by the external source voltage and the machine rotation speed. Since these variables have a great influence on the electric and the mechanical sides, respectively, the working point may correspond to a motor or a generator behavior.


Permanent Magnet DC machine – Test : Working point – Constant Speed - U-N - Overview

All the results are computed from a Finite Element Analysis (Flux) - Transient application. The results of this test give an overview of the electromagnetic behavior of the considered machine at a given working point.

The general data of the machine, such as power balance, machine constant and torque ripple, are computed and displayed.

The magnetic flux density is also computed in every region of the machine magnetic circuit to evaluate the design.

User inputs

The main user input parameters are the voltage of the external DC source and the rotation speed of the machine. In addition, winding temperatures and magnet temperatures must be set.

Main outputs

Test results are illustrated with data, graphs and tables

Tables of results
  • Machine performance – working point (General data, Machine constants, Power balance, Iron losses, Flux in airgap, Flux density in iron)
  • Ripple mechanical torque at the working point
Curves
  • Normalized machine voltage, current and mechanical torque versus time – Working point
  • Mechanical torque versus time – Working point
  • Voltage of a single path and global voltage of the machine versus time – Working point
  • Current flowing through a single path and global current of the machine versus time – Working point
  • Losses versus time – Working point
  • Power versus time – Working point