Rotor Flux Monitoring

Magnetic Insight for Maximum Generator Reliability

Real-Time Monitoring for Generator Shorted Rotor Turns

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Rotor Flux Condition Monitoring

Rotor flux monitoring measures the electromagnetic field generated by a machine’s rotor to assess its electrical balance, magnetic symmetry, and overall performance. Variances in the magnetic flux within a generator indicate deterioration of winding insulation. Whether a result of thermal wear, large variation on load, contamination, load cycling, or other causes, the impact to efficient generation is significant. Imbalances within the rotor can damage insulation, which degrades the generator’s output capacity and increases vibrations. This can further damage the insulation and lead to a forced outage.

Failure Modes Detected

  • Turn-to-turn shorts
  • Field winding open circuits
  • Uneven magnetic field distribution
  • Insulation degrading or overheating

Customer Testimonials

"This is the first time I had a job from a company with unmatched response time, highly professional technicians, and more than 100% service satisfaction."

K.P.
Electrical Engineer
Consulting Company

“Cutsforth provided the high quality and individual detail that customers have learned to expect from a focused and dedicated subject matter expert. The close attention to detail resulted in our finding and repairing several other problems that could have been the root cause of past collector ring and brush problems.”

T.P.
Principal Engineer
Large East Coast Power Producer

"More informed replacement schedules optimize asset lifetime and performance, thereby reducing operational costs and business risk from unexpected failures."

Ethan Smith
EIT, Capital Planning Engineer
San Jose Water

Rotor Flux Monitoring Software

InsightCM™ captures and analyzes rotor flux probe signals in real time, detecting magnetic field asymmetries, turn shorts, and winding faults while correlating them with vibration, temperature, and electrical data to provide a complete view of rotor health.  Features:

User-Defined Thresholds for Alarms

  • Alarms can be associated with multiple features
  • Full data sets are collected on alarms
  • Operating states can be configured using InsightCM

Calculations:

  • Maximum flux deviation
  • The percent deviation associated with an FDZC
  • A table calculates deviation and number of shorted turns per coil on FZDC. These values are trended over time
  • System plots FDZC for each coil over time

Measurement Capabilities

How It Works

  • Captures high-fidelity magnetic field waveforms during real operating conditions
  • Detects subtle changes indicating winding shorts and rotor pole imbalance
  • Identifies excitation system issues without intrusive testing or downtime

Integration with InsightCM

  • Provides continuous, real-time visibility into rotor flux behavior
  • Enables early detection and faster root-cause analysis of electrical faults
  • Integrates directly with InsightCM for trending, alarms, and long-term analytics

Additional Resources

Tech Brief: Rotor Flux Monitoring ROI Paper
Flyer: Quick Guide to Rotor Flux Monitoring
Article: Root Causes of Collector Ring Fires in Power Generators

Rotor Flux Monitoring (RFM) FAQs

What are shorted turns that rotor flux monitoring detects?

Failure of insulation between windings in a generator.

Does Cutsforth manufacture and install flux probes?

Cutsforth does not manufacture or sell probes. However, our rotor flux monitoring system is agnostic to probes within the industry.

On which flux probes can rotor flux monitoring be installed?

Any probe that is analog, providing +/- 10-volt inputs.

What are the benefits of continual monitoring over third-party annual monitoring?

Third-party vendors visiting plants on an annual basis are expensive and only capture a miniscule snapshot of the generator’s health. However, continuous RFM monitoring is a one-time purchase. The system collects data and creates waveforms from thousands of frequencies allowing plants to measure and archive data over time to form a more comprehensive view of your generator’s health. This option allows plants and companies ownership of their data without having to pay to access it.

How do I interpret the data once I have it?

Cutsforth offers access to subject matter experts to assist in reading and analyzing data.

Do I need an outage to install the Cutsforth Rotor Flux Monitoring system?

No, RFM monitoring is a non-invasive installation process requiring NO outages.