What does the EFU motor do? Type, power, speed regulation and fan matching method

What is the function of the EFU motor? You can't just answer 'driving the fan'. The EFU motor is the power source of the whole machine, driving the fan to rotate and sending the filtered air to the internal protection area of ​​the equipment. The motor type, power and speed regulation method determine whether the EFU can operate stably under the target working conditions. If the motor is selected to be small, the working point deviates from the high-efficiency zone, and the temperature rise rises; if the motor is selected to be large, the efficiency range does not match, and energy consumption is wasted; the speed regulation method does not match, and equipment linkage cannot be realized. To understand the role of the EFU motor, we need to look at its position in the whole machine, what types it has, how the power is matched, how the speed regulation is set, and how the motor and the fan work together. Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed control. Motor type, power and speed control scheme can be checked according to equipment drawings in the same manufacturing system. There is no need to transmit parameters back and forth between motor factories, fan factories and complete machine factories. This is why many equipment manufacturers will refer to Aili Industrial Power Supporting Instructions when understanding the functions of EFU motors and planning and selection.

Position in the whole machine: The motor drives the fan, and the fan drives the air flow

The EFU motor is responsible for power output in the whole machine and drives the fan impeller to rotate through a shaft or coupling. The fan rotates to generate air volume and static pressure, overcome filter resistance and system resistance, and send clean air to the protected area. The motor itself does not directly handle the air, its function is achieved through the fan. The power, speed and speed regulation method of the motor determine whether the fan can operate stably at the target operating point. If the motor is selected incorrectly, the performance of the fan will not be fully realized.

Regarding the composition and working principle of EFU in the whole machine, please refer toWhat is EFU? The structure, function, working principle and applicable equipment description are explained in the description, and the function of the motor is understood in the air path of the whole machine.

Motor type: the difference between AC, DC and EC motors

Common types of EFU motors include AC motors, DC motors and EC motors. AC motors have simple structures and controllable costs, and are suitable for fixed speeds or simple speed regulation; DC motors have a wide speed range and smooth start, and are suitable for scenarios that require multi-speed operation; EC motors have built-in drivers, wide efficiency ranges, and flexible control interfaces, making them suitable for linkage with equipment. Different motor types have different speed adjustment methods, efficiency ranges and maintenance methods. When selecting, you should choose according to the equipment needs.

For a detailed comparison of the three types of motors, please refer toWhat is the difference between DC EFU and AC EFU? How to compare energy consumption, speed regulation, control and selection withHow to choose between EC EFU and DC EFU? installation conditions, operating costs and maintenance differences .Notes on

Power matching: The motor power should cover the working point and leave a margin

The power of the EFU motor must cover the shaft power of the target operating point and leave a margin. If the power is selected small, the motor will run in an overloaded or near full load state for a long time, the temperature will rise, and the service life will be shortened. If the power is selected high, the motor will run in the low load area for a long time, resulting in low efficiency and waste of energy. When matching, first determine the shaft power corresponding to the target air volume and static pressure, and then check whether the rated power of the motor covers this operating point. Both work points, initial installation and final operation, must be checked.

Regarding the relationship between motor power and complete machine matching, 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

Speed ​​adjustment method: Select the speed adjustment scheme according to equipment needs

The speed regulation method of the EFU motor must match the equipment control requirements. Frequency speed regulation, multi-speed motors and voltage speed regulation are common for AC motors; 0-10V, PWM or communication speed regulation are common for DC motors and EC motors. If the equipment needs to operate in multiple gears and be linked with the controller, choose a solution with a wide speed range and flexible interface; if the equipment only needs a fixed speed or simple two-speed switching, choose a solution with a simple structure. The speed regulation method does not match, equipment linkage cannot be realized, or the speed regulation accuracy is not enough.

For detailed settings of the speed control scheme, please refer toHow to set EFU multi-speed speed adjustment? Equipment linkage, abnormal status and acceptance pointsHow does EFU achieve 0-10V speed regulation? signal wiring, speed setting and how to deal with abnormal conditions .Interface descriptions on

Matching with the fan: The motor and the fan must form a working point

The EFU motor and the fan are in a cooperative relationship. The motor provides rotational speed and torque, and the fan converts the rotational speed into air volume and static pressure. The motor power, speed range and speed regulation method must match the fan curve. If the motor speed is too high, the fan may exceed the allowable speed; if the motor power is insufficient, the fan working point cannot be reached; if the motor speed adjustment range is narrow, there is little room for adjustment of the fan working point. When matching, it depends on the joint working point of the motor and the fan.

Regarding the relationship between the fan working point and the matching of the whole machine, please refer toHow to choose EFU centrifugal fan? working point, power, temperature rise and continuous operation requirements .Checking methods for

Temperature rise and continuous operation: long-term operation of the motor must be confirmed separately

EFU motors usually need to run continuously inside the equipment, and 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. Without proper protection of the motor, the temperature rise may directly affect the service life.

In the EFU project, Aili Industrial checked the temperature rise of the 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 To judge the motor temperature rise, please refer toHow to judge the temperature rise of EFU motor? measurement conditions, load, heat dissipation and limit value confirmation .Checking methods for

Aili Industrial's EFU motor matching

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. Motor type, power and speed control scheme can be checked against equipment drawings within the same manufacturing system, and the matching between motors, fans and complete machines does not need to be passed across suppliers. For equipment with clear requirements for motors, Aili Industries can organize prototype testing and batch curing according to the confirmation diagram, and transfer power matching, speed range and temperature rise data to verifiable complete machine data. Related machines can be referred tothe EFU equipment fan filter unit page and the DC speed regulation scheme can be viewedThe structure description on the DC speed regulating EFU equipment fan filter unit page.Control instructions 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 motor type, power matching, speed regulation method, temperature rise and complete machine working point 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 controller correspond one by one according to the order list, which facilitates the equipment manufacturer to select the EFU 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 avoid mismatching the speed range of the motor and the fan. It should be avoided to ignore the temperature rise in continuous operation. It should be avoided to avoid the incompatibility between the speed regulation method and the equipment control. The core of EFU 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, listing the motor, power and speed regulation 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 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, listing the motor, power and speed regulation conditions together.

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

Prepare current project information around functional boundaries, rated operating conditions and equipment interfaces. 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 understanding the functions of EFU motors, you can refer to the supporting instructions for motors and complete machines provided by Aili Industries 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 match EC motor for EFU? Working point, speed regulation, power and control interface

How to choose EFU AC motor? 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 type, power and speed control scheme can be checked against 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 motor selection 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 , filter package can be viewedHEPA and ULPA air filters , non-standard interfaces can be viewedCustom EFU . Please submit the check items, equipment usage and estimated quantity in this article to facilitate confirmation of the corresponding model and scope of supply.