Forced I

Positioning and objective

The aim of the test “Working point – Square wave – Motor – Forced I” is to characterize the behavior of the machine when operating with a forced current defining a square wave drive.

A parameterized trapezoidal shape current defines the line current.

The control angle between the back-emf and the phase current, the value of current and the imposed speed induce the resulting working point. Then, the main corresponding performance are computed and displayed.

Figure 1. Working point – Square wave – Motor – Forced I - Illustration

All the results are computed from a Finite Element Analysis (Altair Flux) - Transient application. The results of this test give an overview of the electromagnetic behavior of the considered motor.

The general data of the machine, like machine constants, power balance and magnet behavior are computed and displayed.

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

The following table helps to classify the test “Working point – Square wave – Motor – Forced I”.

Table 1. Positioning of the test “Working point – Sine wave – Motor – I, U”
Family	Working point
Package	Square wave
Convention	Motor
Test	Forced I

Warning: When running the test “Working point – Square wave – Motor – Forced I” with a delta winding connection. Two electrical periods are considered for reaching a steady state behavior of the motor. However, sometimes two periods could not be enough to get a good convergence of our process.

Inputs

For more details, please refer to Inputs.

Thermal

For more details, please refer to Thermal.

Mechanics

For more details, please refer to Mechanics.