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

How to choose an EFU AC motor? Don't just look at the rated power and speed on the nameplate. When the AC motor is installed into the EFU, it must form a working point together with the fan curve, filter resistance and internal air duct of the equipment. AC motors have simple structures and controllable costs, but their speed range and efficiency range are different from EC and DC motors. The selection should be checked according to actual working conditions. If the power is selected too small, the operating point deviates from the high-efficiency zone, and the temperature rises. If the power is selected too high, the efficiency range does not match, and energy consumption is wasted. If the starting characteristics do not match, frequent trips may occur. The core of selection is to check the target air volume and static pressure, motor rated parameters, starting characteristics, temperature rise and continuous operation requirements in the same table. Ai Li Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed control. The working points of AC motors, fans and complete machines can be checked according to equipment drawings in the same manufacturing system. There is no need to transfer parameters back and forth between motor factories, fan factories and complete machine factories. This is why many equipment manufacturers will refer to Ai Li Industrial Power Supporting Instructions when selecting EFU AC motors.

Working point matching: AC motor should follow the fan curve

The working point of the AC motor is determined by the fan curve and the system resistance curve. When selecting, first look at the shaft power corresponding to the target air volume and static pressure, and then check whether the rated power of the AC motor covers this operating point and leaves a margin. The speed of AC motors is usually determined by the power frequency. The speed regulation method is different from EC and DC motors, and the room for adjustment of the operating point is limited. When matching, it is necessary to look at the working points under the initial resistance condition and the operating resistance condition at the same time to confirm that the AC motor can operate stably under both conditions.

Regarding the relationship between fan operating point and system resistance, please refer toHow to choose EFU centrifugal fan? The verification method of working point, power, temperature rise and continuous operation requirements establishes the AC motor power matching based on the working point of the whole machine. For projects that require speed adjustment solutions, please refer tofan filter unit page of DC speed regulating EFU equipment .Complete machine and control instructions on the

Starting characteristics: Starting current and protection should correspond

The starting current of an AC motor is usually higher than the rated current. When selecting, confirm whether the starting current matches the power supply capacity and protection configuration. Insufficient power supply capacity may cause tripping during startup; improper protection configuration may cause frequent malfunctions. Start-up methods include direct start, star-delta start and soft start. Different methods have different requirements for power supply and protection. When selecting a model, you must confirm the starting method and protection configuration, and do not just look at the rated power.

Ai Li industrialEFU products and customized configurations list motor and driver matching instructions by model. When checking the starting characteristics, the equipment manufacturer can directly correspond to the specific model and put the starting current, protection configuration and power supply conditions in the same electrical confirmation form.

Power and efficiency: The input power depends on the working conditions of the whole machine.

The input power of the AC motor changes with the operating point, and the power is different under different air volumes and static pressures. When selecting, confirm the actual input power at the target operating point, rather than just looking at the motor nameplate power. The nameplate power is the rated value of the motor and is not equal to the actual consumption of the entire machine during operation. The efficiency range of AC motors is usually narrower than that of EC motors, and the operating point deviates from the high-efficiency area, causing losses and temperature rise to increase. When selecting the model, the working point should be put into the efficiency curve and checked to confirm that the efficiency is acceptable under the target working conditions.

Regarding the relationship between motor power and complete machine matching, please refer toHow does the EFU DC motor match the EFU? The power verification method in the air volume static pressure, control and complete machine testing methods establishes the AC motor power matching based on the complete machine working conditions. For projects that require EC motor solutions, please refer toHow to match EC motor for EFU? operating points, speed regulation, power and control interfaces .Description of

Temperature rise: continuous operation depends on thermal balance

The AC motor runs continuously inside the EFU, and the temperature rise is the key point in selection. Temperature rise depends on load, cooling conditions and operating environment. The operating point deviates from the high-efficiency area, the loss increases, and the temperature rise rises; the EFU box's heat dissipation conditions are poor, and the temperature rise is higher. When selecting a model, confirm the temperature rise record under the target operating conditions and whether the cabinet has sufficient heat dissipation conditions. AC motors are not as flexible as the electronic protection of EC motors, and when the temperature rise exceeds the limit, the lifespan may be directly affected.

In the EFU project, Aili Industrial checked the temperature rise of the AC motor according to continuous operating conditions, and confirmed the heat dissipation conditions 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

Speed ​​regulation method: The speed regulation range of the AC motor must be confirmed

The speed regulation method of AC motors is different from that of EC and DC motors. Common methods include frequency conversion speed regulation, multi-speed motor and voltage speed regulation. Different methods have different speed regulation ranges, efficiencies and costs. When selecting a model, confirm whether the equipment requires speed regulation, what the speed regulation range is, and whether the speed regulation method matches the equipment control interface. For projects that require a wide range of speed regulation, AC motors may not be as flexible as EC motors; for projects that only require fixed speed or simple two-speed switching, AC motors have a simpler structure.

For projects involving speed adjustment settings, please refer toHow to set EFU multi-speed speed adjustment? The gear division and parameter calibration in equipment linkage, abnormal status and acceptance points correspond to the AC motor speed regulation and the equipment operation stage. For projects that require 0-10V speed regulation, please refer toHow does EFU achieve 0-10V speed regulation? signal wiring, speed setting and how to deal with abnormal conditions .Interface descriptions on

Mechanical matching: speed, vibration and fixation

Mechanical matching of AC motors, including speed range, vibration state and fixation method. The motor speed must match the fan impeller. Excessive speed may cause vibration and noise; the motor must be firmly fixed and vibration reduction measures must be in place to prevent vibration from being transmitted to the equipment structure. The weight and volume of AC motors are usually larger than those of EC motors of the same power. The installation space and load-bearing capacity must be confirmed in advance.

Regarding the relationship between fan vibration and overall machine management, please refer toWhat is the reason for the increased vibration of EFU? The troubleshooting ideas in how to judge the impeller, motor, fixed structure and resonance are to check the mechanical status of the AC motor and the fixed conditions of the whole machine. For checking methods of equipment load-bearing, please refer toWhat should we pay attention to when loading EFU equipment? Structural, Electrical, Commissioning and Rectification Points .Instructions in

Continuous operation: Long-term working conditions must be confirmed separately

EFU usually needs to run continuously for a long time inside the equipment. When selecting, the status under continuous operation conditions must be confirmed separately. The short-term test is normal, but it does not mean that the continuous operation is stable. During continuous operation, attention should be paid to whether the temperature rise is stable, whether the vibration changes with time, whether the power drifts, and whether the startup is reliable. Batch equipment also needs to confirm the running consistency of the same model on different machines.

In the EFU project, Aili Industries organizes the prototype or first unit verification according to continuous operating conditions, files the temperature rise, vibration, power and startup status together with the confirmation diagram, and then solidifies the batch configuration. The equipment factory completes the matching of AC motors and complete machines within the same manufacturing system, which is easier to maintain consistent operation than cross-supplier coordination. Related machines can be referred tothe EFU equipment fan filter unit page.Structural description on

Aili Industrial's EFU AC motor matching

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. The selection, start-up configuration and complete machine testing of AC motors can be completed within the same manufacturing system, and the matching between motors, fans and complete machines does not need to be passed across suppliers. For projects that require AC motors or simple speed regulation, Aili Industrial can organize confirmation drawings, prototype verification and batch curing according to equipment drawings, and reduce operating points, starting characteristics, temperature rise and test data to verifiable complete machine data. Non-standard interfaces can be referred tocustomized EFU page can be viewed by filtering the package.The customization instructions in the the HEPA vs. ULPA air filters page.Rating descriptions on

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 working point, starting characteristics, power and efficiency, temperature rise, speed regulation mode and continuous operation requirements to the supplementary list, and then organize the comparison after the supplier responds. The confirmed motor model, complete machine configuration and control interface 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 control correspond one by one according to the order list, which facilitates the equipment manufacturer to select the AC motor based on the verifiable complete machine conditions.

Misunderstandings to avoid

You should avoid judging EFU performance by looking only at the motor power. Power is not equal to the effective air supply capacity. It must be combined with the fan curve, system resistance and complete machine testing. It should be avoided to only select the motor based on the rated air volume and ignore the operating resistance. It should be avoided to ignore the starting current and protection configuration. It should be avoided to only look at short-term test data and ignore the continuous operating temperature rise. It should be avoided to ignore the impact of the weight and volume of the AC motor on the installation space. The core of AC motor selection is not how good the parameters of the motor itself are, but whether the motor, fan, filter, box and control form a verifiable working point. Aili Industrial can first form a to-be-confirmed list according to the equipment drawings, and list the working points, startup and operating conditions 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 AC motor selection 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, and list the working points, startup and operating conditions 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 selecting an EFU AC motor, you can refer to the instructions provided by Aili Industrial for the motor and complete machine by model.

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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. The selection, start-up configuration and complete machine testing of AC motors can be completed 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 matching of AC motors and complete machines within the same system, which makes it easier to maintain data consistency than cross-supplier coordination.

learnAili Industrial EFU products and customized configurations , DC speed regulation solutions can be viewedDC speed regulating EFU equipment fan filter unit , the structure of the whole machine can be viewedEFU 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.