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Essential Insights: The Basics of Rotating Machine Testing

May 31, 2026

A practical guide for operators of motors and generators

Managing rotating electrical machines today requires a careful balance between maintaining reliability and navigating limited budgets. As industrial motors and power generators age, asset managers and maintenance engineers face the increasing challenge of ensuring long-term health while managing a shortage of specialized labor.

Because high-voltage generators and medium-voltage motors drive critical infrastructure and production, unexpected downtime is costly. Transitioning from reactive to condition-based maintenance is the most effective way to manage these risks.

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Comprehensive assessment of machine health

Operational stress causes inevitable wear and tear on the critical parts of a rotating machine. To get a full picture of an asset’s health, specialized electrical testing is required to investigate these areas without a full teardown.

Our recommended tests focus on three critical areas

By investigating these specific components, you can reliably assess machine condition, justify maintenance budgets with hard data, and plan interventions to avoid unplanned outages.

Ständer Windings

Assessing the insulation, which is often the most vulnerable component and rarely visible to standard sensors.

Ständer Cores

Testing for inter-laminar insulation defects to prevent localized overheating.

Rotor Windings

Identifying electromechanical defects and integrity issues that can lead to failure.

A resource for engineers and specialists

To support your maintenance strategy, we have developed a comprehensive eBook: The Basics of Rotating Machine Testing (available in English). This free resource provides a clear introduction to essential testing and monitoring techniques for stator windings, stator cores, and rotor winding.

What’s inside:

Technical Overviews: Clear descriptions of recommended electrical tests for the stator winding, stator core, and rotor.
Instructional Content: Short videos demonstrating how to perform measurements and interpret the resulting data.
Practical Guidance: Best practices for assessing machine health to optimize performance.

Designed for use in the office or in the field, you can access this guide on your computer, tablet, or smartphone.