If any abnormality is suspected, non-contact thermometers can be used to measure the temperature. In this configuration NTC1 and NTC2 are placed on the PCB under two different motor windings. In smaller motors, no temperature monitoring provision is given. Readings from these instruments can be periodically taken and monitored. In some motors, temperature gauges or industrial thermometers which indicate temperature are provided. High bearing Temperature can be caused by improper alignment with the load, inadequate lubrication and even high ambient temperature. These sensors are also connected to the temperature monitoring equipment. High ambient temperature can also be a reason for high winding temperature.Ībnormal winding temperature can cause damage to the insulation eventually leading to failure.īearing Temperature in motors is measured by temperature sensors which are machined in the bearing housing such that the tip of the sensor comes in contact with the bearing.
MOTOR WINDING TEMPERATURE SENSOR SERIES
The PTC sensors should be connected in series to detect the temperature of all phases’ windings. Poor ventilation can be due to a filter which has choked. In order to provide direct thermal contact between the motor windings and the sensor, motor protection sensors are PTC limit temperature sensors. The sensors (usually RTDs) can be connected to any external monitoring device.Ībnormal winding temperature in a motor winding can indicate overloading or poor ventilation. These temperature sensors are not always accessible from outside. Winding temperature is measured by temperature sensors which are attached to the windings in the stator slots at the time of manufacture. They are also used to measure temperature in. The two temperatures which are monitored at the bearing temperatures and the winding temperature. Applications include temperature measurement in or on electric motor windings, stator slots and bearings.
MOTOR WINDING TEMPERATURE SENSOR PATCH
For Thermal-Ribbon or patch style sensors for retrofit installations click here. Temperature can indicate any abnormality before any serious damage occurs. Stator Winding RTDs and Thermocouples for Electric Motors & Generators. To adjust the temperature limits in the protection and alarm system, this difference must be taken into account.Ĭheck out more Nishisan tips in our blog and contact our team for a quote and to clarify your questions about motors and generators.Temperature is an important parameter in motor operation. There will always be a temperature gradient between the inside of the copper and the temperature sensor. Remember that the greatest source of heat is in the copper losses in the coils (Joule effect).Īs the sensors are contact sensors, they need to be protected by an enclosure. The abrupt increase in the resistance of the thermistor at high temperatures can be used as a control signal for the tripping unit. In this case, the PTC Thermistor is wound directly into the winding so that direct thermal contact is produced. Phase sequence control for direction of rotation is also monitored and pre-wired to terminals 1, 2 and 3. The installation of these sensors is usually in strategic regions of the winding, where the objective is to find the hottest point and control its limit. PTC Thermistors are widely employed as temperature sensors in electrical machines to monitor winding temperature. The module also monitors motor winding temperature via the motor sensors embedded into the motor windings which are wired in series and connected to the module. The most common practice to monitor the temperature is through the installation of temperature sensors (usually RTD type PT 100) that are in direct contact with the coils inside the slots. We have already covered in previous issues that controlling the temperature of the machine is fundamental to avoid premature aging, because as we said, temperature is usually the predominant factor for the aging of insulating materials. ICH linear motors use this sensor in the standard version.
![motor winding temperature sensor motor winding temperature sensor](https://3.imimg.com/data3/YL/EL/MY-2313355/bulb-type-winding-overhang-rtd-for-lt-motors-500x500.jpg)
Resistor change between -30☌ and +160☌ is nearly linear, that allows absolute temperature measuring. Optionally KTY 84-130 sensors can be used in the AKM motor.
![motor winding temperature sensor motor winding temperature sensor](https://www.amphenol-sensors.com/hubfs/Thermometrics_A-1737_Motor_Coil_Temp_Sensor-3-2.jpg)
![motor winding temperature sensor motor winding temperature sensor](https://www.sensit.cz/Aton/FileRepository/aton_file_group_272c9ead9daa8165611643634439408983852/hwcGFCyVvhfmUJiWekue.jpg)
The aging cycle of a machine is directly associated with the deterioration of the insulating material of its winding. Temperature sensors with PTC (switch) characteristics (T NTT 155☌) are used in the AKM motor windings by default. Sometimes several of these are wound into the motor winding and internally. Are you correctly monitoring your winding temperature? Pump motor over temperature detection is a combination of temperature sensors.