How to match EC motor for EFU? Working point, speed regulation, power and control interface

How to match the EC motor used in EFU? You cannot just look at the voltage and power on the motor nameplate. When the EC motor is installed into the EFU, it must form an operating point together with the fan curve, filter resistance and internal air duct of the equipment. The advantages of EC motors are wide speed range, good efficiency range, and flexible control interface. However, if the matching is incorrect, the advantages cannot be fully exerted: the power is selected to be small, the operating point deviates from the high-efficiency area, and the temperature rise rises; the speed mapping is inaccurate, and the air volume deviation of each gear is large; the control interface is incompatible, and the wiring is repeatedly changed during equipment joint debugging. The core of matching is to put the target air volume, static pressure, motor rated parameters, speed regulation method and control interface in the same table for verification. Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. The working points of EC 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 the motor factory, fan factory and complete machine factory. This is why many equipment manufacturers will refer to Aili Industrial Power Supporting Instructions when matching EC motors for EFU.

Working point matching: EC motor should follow the fan curve

The working point of the EC 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 EC motor covers this operating point and leaves a margin. Selecting a motor only based on the maximum power of the fan may cause the motor to run in a low load area for a long time, resulting in low efficiency; selecting only based on the rated air volume will increase the resistance after dust accumulation in the filter, and the motor may be overloaded. When matching, the working points under initial resistance conditions and operating resistance conditions must be looked at at the same time. Both working points must fall within the high efficiency range of the EC motor.

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

Speed ​​matching: EC motor speed range and mapping

One of the advantages of EC motors is their wide speed range. When matching, it is necessary to confirm whether the speed adjustment range covers the equipment operating gear, and whether there are actual measured data for the speed, air volume, power and noise at each gear. The mapping relationship between the control command and the rotational speed must be calibrated by actual measurement. It cannot be assumed that 50% of the command means 50% of the air volume. The speed adjustment range is narrow, and the equipment may be unstable when running at low gears; the mapping is inaccurate, and the air volume deviation at each gear is large. The speed regulation methods of EC motors include 0-10V, PWM and communication commands. When matching, make sure that the device control method is consistent with the motor interface.

For detailed methods 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 EC motor speed regulation and the equipment operation stage. For specific wiring and calibration of 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

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

The input power of the EC motor changes with the operating point, and the power is different under different air volumes and static pressures. When matching, confirm the actual input power of 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. If the power is selected to be small, the motor may be overloaded; if the power is selected to be large, the efficiency range will deviate and energy consumption will increase. The high efficiency range of EC motors is usually wider than that of AC motors, but the operating point must still be put into the efficiency curve to check.

Ai Li industrialEFU products and customized configurations list motor and driver matching instructions by model. When checking the power, the equipment manufacturer can directly correspond to the specific model and compare the input power of the complete machine working point with the motor rating.

Control interface: signals, terminals and protocols must correspond

The control interface of EC motor includes speed control signal, start and stop control, status feedback and communication protocol. When matching, confirm the signal type, terminal definition, common terminal and shield grounding to ensure compatibility with the device controller. Only write 'Support speed adjustment' without writing signal type and terminal definition. It is easy to make wrong connections or repeatedly change the wiring during joint debugging. For projects that require communication control, the protocol version, address setting and data format must also be confirmed.

For detailed methods involving control interface definition, please refer toHow to implement EFU local speed adjustment? Interface and terminal descriptions in wiring, parameters, control logic and debugging methods , put the EC motor control interface and equipment electrical diagram in the same confirmation document.

Temperature rise and heat dissipation: continuous operation must be confirmed separately

The EC motor runs continuously inside the EFU, and the temperature rise is the key point for matching. 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 matching, confirm the temperature rise record under the target working conditions and whether the box has sufficient heat dissipation conditions. Ultra-thin or compact models have tighter space and worse heat dissipation conditions and need to be checked separately.

In the EFU project, Aili Industrial checked the temperature rise of the EC motor and driver 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

Mechanical matching: speed, vibration and fixation

Mechanical matching of EC 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. When matching, check the connection method, dynamic balance status and fixed points of the motor and fan.

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 EC motor and the fixed conditions of the whole machine.

Whole machine test: matching results must be verified with data

The matching of EC motor and EFU must ultimately be verified with complete machine test data. The test should cover the target air volume and static pressure, speed and power of each gear, continuous operating temperature rise, vibration and noise. It only measures the highest gear and cannot judge whether the middle gear is stable; it only measures short-term data and cannot judge the continuous operating status. The test data should be compared with the motor rated parameters, fan curve and confirmation chart. If the difference is large, check the matching conditions instead of directly replacing the motor.

In the EFU project, Aili Industry organized the complete machine test according to the equipment drawings and agreed working conditions, and verified the EC motor, fan and complete machine data together. The equipment factory completes the matching of motors and complete machines within the same manufacturing system, which makes it easier to maintain data consistency than cross-supplier coordination. Related machines can be referred tothe EFU equipment fan filter unit page.Structural description on

Aili Industrial's EFU EC motor package

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. EC motor selection, speed mapping and complete machine testing 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 EC speed regulation or equipment linkage, Aili Industrial can organize confirmation drawings, prototype verification and batch curing according to equipment drawings, and put the working point, speed regulation range, temperature rise and test data into 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, speed range, power, control interface, temperature rise and complete machine test requirements to the supplementary list, and then organize a 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 match the EC motor to 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 default the control command equal to the air volume ratio. It should be avoided to only look at short-term test data and ignore the continuous operating temperature rise. It should be avoided to only measure the highest gear and ignore the stability of the middle gear. It should be avoided to confirm the compatibility of the control interface until joint debugging. The core of EC motor matching 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, speed regulation and control interface 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 the matching of EC motors for EFU 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, speed regulation and control interface 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 matching EC motors for EFU, you can refer to the instructions for matching the motor and complete machine provided by Aili Industry 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. EC motor selection, speed mapping and complete machine testing 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 EC 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.