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As the “heart” of an air purifier, the core performance indicators of its motor directly determine the purification efficiency, noise level, energy consumption performance, and service life. These indicators can be mainly categorized into the following types, and each type has a crucial impact on the user experience.
First is the air volume and air pressure indicator, which is the core parameter for measuring the motor’s ability to drive air circulation. Air volume refers to the volume of air that the motor can deliver per unit time, usually measured in cubic meters per hour (m³/h); air pressure is the motor’s ability to overcome the resistance of the filter screen and promote air flow, measured in Pascals (Pa). During the purification process, sufficient air volume allows air to pass through the filter screen more quickly, ensuring the frequency of indoor air circulation. For example, an air purifier with an air volume of 300 m³/h can filter the air in a room of about 50 square meters 3-4 times per hour, significantly improving the purification speed; while sufficient air pressure can prevent the air volume from dropping sharply due to increased air resistance caused by dust accumulation on the filter screen over time, thus ensuring that the purification effect does not diminish. If the motor’s air volume is insufficient, the purification range will be limited, and pollutants in corners will be difficult to remove; insufficient air pressure may lead to the problem of “a sharp drop in air volume after increased air resistance”, affecting the long-term use effect.
Second is the noise control capability, an indicator closely related to the comfort of users’ daily lives. The noise generated by the motor during operation mainly comes from mechanical friction, air turbulence, and electromagnetic vibration, usually measured in decibels (dB). A high-quality motor can produce noise as low as 25 dB or below when running at low speed, which is close to the ambient sound in a library. The noise level directly affects the usage scenarios. For instance, if the noise of the motor in an air purifier used in the bedroom is too high (exceeding 40 dB), it will interfere with sleep; in an office setting, excessive noise will also distract people from work. The noise control of the motor relies on the design of precision bearings (such as the use of silent ball bearings to reduce friction), the optimized air duct structure (to reduce air turbulence noise), and the dynamic balance technology of the stator and rotor (to reduce vibration noise). These technical details collectively determine the quietness of the motor during operation.
Third is the energy efficiency ratio, which is the ratio of the motor’s output air volume to its power consumption (unit: m³/(h·W)) and is a key indicator for measuring the energy-saving performance of the motor. A motor with a high energy efficiency ratio consumes less power for the same air volume. For example, compared with a motor with an energy efficiency ratio of 5 m³/(h·W), a motor with an energy efficiency ratio of 8 m³/(h·W) can save approximately 2 kWh of electricity per day when achieving an air volume of 400 m³/h, which can significantly reduce electricity expenses in the long run. At the same time, a low-power motor generates less heat, which can reduce the heat dissipation burden of the machine body and extend the service life of the entire device. It is particularly suitable for scenarios that require 24-hour continuous operation (such as formaldehyde removal in newly decorated houses and purification during allergy seasons).
Finally, there is stability and service life, which are mainly related to the motor’s materials, craftsmanship, and protective design. High-quality motors usually adopt full-copper wire windings (with good electrical conductivity and low heat generation), high-temperature resistant insulating materials (capable of withstanding temperatures above 120°C), and are equipped with overcurrent and overheating protection devices, which can prevent damage during voltage fluctuations or long-term operation. The service life of a motor is usually measured by the cumulative operating time. The service life of an ordinary motor is about 5,000-8,000 hours, while that of a motor with high-quality components can exceed 10,000 hours. A motor with insufficient stability may have problems such as “sudden shutdown during operation” and “unstable air volume”, which not only affects the continuity of purification but also may increase maintenance costs due to frequent failures; a shorter service life means that users need to replace the motor earlier, increasing the use cost.
In summary, the air volume and air pressure, noise control, energy efficiency ratio, and stability and service life of an air purifier motor together constitute its core performance system. When choosing an air purifier, users can comprehensively judge the motor’s performance by checking the product parameters (such as CADR value, noise decibel level, and energy efficiency grade) and considering the motor brand (such as professional motor brands like Zhi Pu and AUX), so as to select a product with good purification effect and excellent user experience.
