Characteristic Curve of DC Motor — Lesson 4

This lesson focuses on characterizing a DC motor's behavior, a crucial step for implementing monitoring functions in motor control systems using Ansys SCADE® embedded software product collection. The primary parameter for motor characterization is the speed set value, and understanding the motor's idle behavior helps establish a baseline for control adjustments. The lesson explains how deviations from the idle control output indicate loading, requiring system compensation. Noise in speed measurements is addressed through averaging. A second-order polynomial was initially considered for motor calibration but was simplified to a linear curve with four support points for easier implementation. The lesson demonstrates integrating the calibration curve into Ansys SCADE software using arrays and lookup tables (LUTs) and computing load by measuring deviations. The session concludes with a reminder about calibration sensitivity to factors like supply voltage and the importance of consistency for accurate monitoring, leading into the final lesson on monitoring functionalities. 

Lecture

Alternate video link.

Video Highlights

00:23 - Introduction

00:56 - Control Output Vs. Load

01:33 - Real Environment Conditions

02:30 - Control Value and Set Speed

03:41 - Motor Calibration Curve

06:46 - Calibration Curve in Ansys SCADE Software

08:46 - Dealing with Noise

09:56 - Actual Load Computation