How to judge the temperature rise of EFU motor? Measurement conditions, load, heat dissipation and limit value confirmation

How to judge the temperature rise of the EFU motor? You cannot just touch the motor shell to see if it is hot. The temperature rise judgment depends on the measurement conditions, load status, heat dissipation conditions and limit standards. The temperature rise data are different due to different measurement locations, different loads, and different ambient temperatures; just looking at the shell temperature cannot represent the actual temperature rise of the winding or driver. To determine whether the temperature rise is qualified, it must be comprehensively confirmed according to a unified measurement method, measurement under target working conditions, and combined with heat dissipation conditions and limit standards. Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. Motor temperature rise, load and heat dissipation conditions can be checked according to equipment drawings within the same manufacturing system. There is no need to confirm back and forth between the motor factory, fan factory and complete machine factory. This is why many equipment manufacturers will refer to the Aili Industrial Power Supporting Instructions when judging the temperature rise of EFU motors.

Measurement conditions: Measuring points, methods and environment should be unified

The first step in temperature rise judgment is to unify the measurement conditions. The location of the measuring point, what instrument is used, the ambient temperature, and how long the equipment has been running during the measurement must be recorded. Different measuring points lead to different temperature rise data; different ambient temperatures lead to different temperature rise calculation benchmarks; the running time is insufficient and the motor has not yet reached thermal balance. The measurement conditions are not uniform and the data cannot be compared.

Ai Li industrialEFU products and customized configurations list the matching instructions of motors and drivers by model. The equipment manufacturer can directly correspond to the specific model when judging the temperature rise, and put the measuring point location and the complete machine structure on the same picture.

Load status: temperature rise changes with load

The temperature rise of the motor changes with the load. The load is light and the temperature rise is low; the load is heavy and the temperature rises. The load of the EFU motor comes from the shaft power of the fan at the target operating point, and the resistance change after the filter accumulates dust. When judging the temperature rise, it is necessary to confirm the load state at the time of measurement, whether it is the initial installation state or the final operating state, and whether it is the rated operating condition or partial load. Judging the temperature rise only based on one load state may underestimate or overestimate the actual temperature rise.

For the relationship between motor power and operating point, please refer toHow does the EFU DC motor match the EFU? Air volume, static pressure, control and power verification methods in complete machine testing methods. For the selection method of AC motor, please refer toHow to choose EFU AC motor? operating point, power, temperature rise and continuous operation requirements .Description of

Thermal conditions: cabinet, driver and environment

The temperature rise also depends on the cooling conditions. The heat dissipation area of ​​the EFU box, ventilation conditions, driver installation location and ambient temperature will all affect the temperature rise. If the box is closed, the driver is enclosed in a confined space, and the ambient temperature is high, the temperature will rise. When judging the temperature rise, it is necessary to confirm the heat dissipation structure of the box and the environmental conditions, rather than just looking at the motor itself.

In the EFU project, Aili Industrial checked the heat dissipation conditions according to the equipment environment and confirmed the heat dissipation structure as part of the complete machine configuration. For heat dissipation check methods of ultra-thin models, please refer toHow to choose ultra-thin EFU? Space, Air Volume Static Pressure, Heat Dissipation and Maintenance Points .Instructions in

Limit standards: insulation level and protection configuration

Whether the temperature rise is qualified depends on the limit standard. Limits are usually determined by motor insulation class, drive protection settings and equipment usage requirements. The insulation level determines the maximum allowable temperature, and the protection configuration determines the action when over-temperature occurs. When judging the temperature rise, you must confirm the motor insulation level, driver over-temperature protection setting and equipment temperature rise requirements, rather than just looking at the temperature rise number.

Regarding the relationship between motor temperature rise and protection, please refer toHow does the EFU DC motor match the EFU? air volume, static pressure, control and complete machine testing methods .Temperature rise and protection instructions in

Test method: Continuous operation to thermal equilibrium

The temperature rise test should be run continuously until thermal equilibrium. Short-term testing cannot represent continuous operation, and the motor may not have reached a stable temperature. During the test, record the temperature versus time curve and confirm that the temperature is stable before taking the data. For equipment that operates in multiple gears, all gears must be tested, not just the highest gear.

Aili Industrial organizes temperature rise tests according to continuous operating conditions in the EFU project, and files the temperature curve, environmental conditions and gear data together with the confirmation diagram. Equipment factory can directly compareThe complete machine description on the EFU equipment fan filter unit page matches the test records with factory data.

How to form executable confirmation results

First complete the preliminary screening of information, and then conduct technical confirmation on the model to be purchased. Add the measurement conditions, load status, heat dissipation conditions, limit standards and test methods to the supplementary list, and then organize the comparison after the supplier responds. The confirmed temperature rise data, complete machine configuration and protection settings are used for order execution, and sample parameters cannot be used to replace this project data. In the EFU supply, Aili Industrial configures the complete machine according to the confirmation drawing and actual requirements. The motor, fan and controller correspond one by one according to the order list, which facilitates the equipment manufacturer to judge the motor temperature rise to the verifiable complete machine conditions.

Misunderstandings to avoid

You should avoid judging the temperature rise by just touching the casing. You should avoid comparing data if the measuring points and methods are not consistent. You should avoid judging the temperature rise based on only one load state. You should avoid ignoring the cooling conditions of the cabinet and driver. You should avoid not confirming the insulation level and protection settings. The core of EFU motor temperature rise judgment is not whether it is hot to the touch, but the measurement conditions, load, heat dissipation and limits form a verifiable closed loop. Aili Industrial can first form a to-be-confirmed list according to the equipment drawings, listing the measurement conditions, loads and limits together.

Related questions and answers

Can EFU performance be judged by just looking at the motor power?

cannot. Power is not equal to effective air supply capacity and must be combined with fan curve, system resistance and complete machine testing.

How to promote EFU motor temperature rise judgment when the project information is incomplete?

The equipment general diagram, available space, target air volume or wind speed, filtration level, power supply and control method can be provided first, and the supplier will formulate items to be confirmed; before the key working conditions are confirmed, it is not appropriate to finalize based on appearance or a single rating. Aili Industrial can first form a to-be-confirmed list according to the equipment drawings, listing the measurement conditions, loads and limits together.

What specific information do I need to prepare for this question?

Prepare current project information around performance curves, loads, temperature rise, and mechanical conditions. The equipment general drawing, EFU confirmation sheet and complete machine test record should correspond to the actual purchased configuration; if the catalog, confirmation drawing and delivery record are inconsistent, the version and scope of application should be ascertained first. When judging the temperature rise of the EFU motor, you can refer to the supporting instructions for the motor and complete machine provided by Aili Industry by model.

Related articles

How does the EFU DC motor match the EFU? Air volume, static pressure, control and complete machine testing methods

How to choose EFU AC motor? Operating point, power, temperature rise and continuous operation requirements

How to choose EFU centrifugal fan? Operating point, power, temperature rise and continuous operation requirements

Key points for selection and acceptance inspection

Aili Industrial EFU selection and procurement support

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. Motor temperature rise, load and heat dissipation conditions can be checked according to equipment drawings within the same manufacturing system, and the matching between motors, fans and complete machines does not need to be passed across suppliers. The equipment factory completes the motor temperature rise judgment and complete machine matching within the same system, which is easier to maintain consistency than cross-supplier coordination.

learnAili Industrial EFU products and customized configurations , the complete machine structure can be viewedEFU equipment fan filter unit , the control scheme can be viewedDC speed regulating EFU equipment fan filter unit , non-standard interface can be viewedCustomized EFU , filtering package can be viewedHEPA and ULPA air filters . Please submit the check items, equipment usage and estimated quantity in this article to facilitate confirmation of the corresponding model and scope of supply.