Protect your motors and generators from overheating
Stator slot RTD sensor
Embedded directly in stator windings for accurate, localised temperature monitoring. Avoid costly downtime and insulation failures.
The industrial-quality stator slot RTD are embedded directly into the stator slots, in direct contact with the windings and insulation. This placement ensures highly accurate and localized temperature monitoring – a key factor in enhancing equipment reliability, performance and safety. These sensors are also known as winding temperature detector (WTD). The resistance temperature detectors (RTDs) are essential for protecting high-value electrical machines from overheating, which can lead to insulation damage, system failure, and costly downtime.
Product summary
- Accurate temperature monitoring
- Enhances motor longevity
- Improves efficiency
- Early failure detection
- Ensures safety and cost savings
Understanding the function of stator slots
Electric AC motors and generators consist of two key components: a stationary stator and a rotating rotor. To ensure these vital parts operate safely and efficiently, effective thermal protection is essential, because most motor failures start with overheating of the stator windings.
Stator slots play an important role in this: they are long, narrow grooves in the stator core that hold and secure the copper windings. When AC current flows through these windings, a magnetic field is formed inside the slots and drives the motor. The slot design ensures the windings stay in place, are electrically insulated, and can be effectively cooled, which is crucial for safe and efficient operation.
Preventing motor failure with RTD sensors
Stator slot resistance temperature detectors (RTDs) provide highly accurate temperature monitoring inside the motor’s stator slots, protecting your equipment from overheating, insulation degradation, and costly unplanned downtime.
Overheating is the main enemy of motor insulation. For every 10°C increase in temperature, the insulation lifetime is cut in half. Electrical problems account for 47% of all motor failures, and winding failures alone make up 37%, showing how critical proper temperature monitoring is for protecting motor insulation.
This stator slot RTD sensor plays a major role in preventing extremely expensive motor damage. Large motors typically use six or more stator slot RTD sensors to ensure reliable, safe operation
under all load conditions.
Stator slot applications across industries
Stator slot RTDs or winding temperature detector (WTD) are used across many sectors where reliable electric motors and generators are critical, including:
- Hydroelectric power stations
- Wind turbines
- Industrial manufacturing environments
- Heavy-duty electric machinery and generator systems
In all these applications, precise temperature monitoring leads to:
- Increased motor longevity
- Improved operational efficiency
- Early detection of faults or abnormal voltage conditions
- Enhanced safety during high-demand operations
- Reduced maintenance costs due to fewer insulation failures or mechanical breakdowns
Advanced design for industrial demands
Stator slot RTDs feature sensing elements along most of their length, allowing for continuous average temperature readings across a broad area. This design ensureslocalized hot spots are detected, providing a complete and responsive view of the thermal profile within the stator slot.
Our SMG stator slot RTDs are engineered to meet the demands of high-performance industrial environments. Key characteristics include:
- Flexible, non-inducible materials for optimal fit and performance
- Flat and thin design for seamless embedding between windings
- Bifilar construction to avoid induction-related errors
- Durability under shock, vibration, and pressure
- High accuracy, repeatability, and long-term stability
Custom solutions and precision with SMG
Our stator slot RTDs are manufactured by SMG in South-Korea. Trusted globally, SMG delivers high-performance thermal protection backed by proven Korean engineering. Most of their stator slot RTDs are delivered as custom-built solutions, tailored to the customer’s exact application and performance requirements.
Each sensor is calibrated and built to match your system requirements. Our engineers are happy to assist in selecting the best design for your application.
As an official distributor, Kamet is ready to support you in selecting the right stator slot configuration for your application.
Available specifications:
- Type of element: Pt100 (standard), Pt1000, Copper, Nickel, Type K thermocouple
- Single or duplex elements
- Lengths: 30 mm up to 5000 mm
- Thickness: typically between 1.3 and 2.0 mm
- Body with: depending on singel or duplex system
- Wire configurations: 2-, 3-, 4-, 6 or 8-wire systems
- Tolerance class Class A or B
- Hazardous area options: certified intrinsically safe and increased safety versions (ATEX, IECEx, KTL, KGS, BV Marine)
Let us help you find the best product
When doing business with Kamet, you can rely on fast and responsive customer service and consistent quality.
- Response time: within 24 hours on working days
- Delivery time: 3–4 weeks depending on design and configuration
Our team is ready to help you with technical advice, customization options, or quotations.