Stepper Motor Dynamics Analyzer

The Stepper Motor Dynamics Analyzer is an integrated stimulus and measurement tool that allows you to:

• Evaluate motor performance
• Analyze and compare stepper drivers
• Study the interaction between a motor and driver as a means of selecting the best match
• Test final system performance
• Qualify stepper motor vendors

The system has built-in step and measurement capability to support tests such as:

• Static step accuracy
• Static micro-step accuracy
• Step response
• Velocity smoothness
• Resonance and Damping Factor

Other tests/measurements can be created by adding analog measurements, displays and/or equation based measurements. For example, adding analog measurement capability to the system allows you measure and analyze driver current waveforms. The Stepper Motor Measurements application example illustrates many of the measurements that can be performed using the Stepper Motor Dynamics Analyzer.

The Stepper Motor Dynamics Analyzer consists of three components:

1. Motor test stand (including encoder): holds the Motor Under Test and aligns the motor with the shaft measuring incremental encoder.
2. Motion capture card: provides the step stimulus to the motor driver and an interface to the incremental encoder.
3. SensorPlot with stepper motor indexer option: performs the task of stimulating the stepper driver, making motion measurements, performing mathematical analysis and displaying the results.

Performing a particular test involves nothing more than connecting a motor to the test fixture, selecting the desired test, and pressing the go button. The application automatically configures the stepper indexer and measurement system, and displays the results in the appropriate units (arc minutes, degrees, rps...)

Built-in analysis tools allow you to add additional equation-based measurements (filtering, differences...), make cursor measurements, and perform spectral analysis. Tests can be created on an as-need basis, or pre-created and saved for later retrieval.

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