How to avoid overheating or performance degradation of the 100,000-rpm high-speed motor of a cordless smart vacuum cleaner under long-term high-load operation?

When the motor runs at high speed, the intense friction between the internal winding and the magnetic steel will cause high temperature. If the heat cannot be discharged in time, it will cause the magnetic attenuation of the permanent magnet or even the melting of the insulation layer. To this end, the cordless smart vacuum cleaner adopts a bionic spiral air duct structure, which simulates the guide surface of bird wings to make the cooling airflow wrap the core components of the motor in a laminar form, which improves the heat dissipation efficiency compared with the traditional direct blowing. The heat sink adopts a microchannel fin array, and the surface is etched with honeycomb grooves to increase the air turbulence. At the same time, the liquid metal thermal conductive paste is filled inside to achieve millisecond-level heat conduction from the stator to the shell.

Filter blockage is an invisible cause of motor overload. The cordless smart vacuum cleaner adopts dual-mode blockage sensing technology, which works together with the pressure difference sensor before and after the filter and the airflow soundprint analyzer: the pressure difference sensor monitors the macro airflow resistance, and the soundprint analyzer captures the high-frequency vibration characteristics of the filter fiber due to dust accumulation. When both data reach the critical value, the APP will push a three-dimensional visual cleaning guide, mark the hot spots of local blockage of the filter, and recommend targeted cleaning methods such as water washing/patting.

After cleaning the filter, the user needs to touch the sensing area of ​​the fuselage with the NFC of the mobile phone to complete the calibration. The system will record the remaining life of the filter and dynamically adjust the suction strategy. In addition, the motor bearing health management predicts the grease failure cycle by monitoring the starting current fluctuation and the running noise spectrum. When the bearing friction coefficient is detected to be abnormal, the voice assistant will guide the user to perform lubrication maintenance to avoid the eccentric vibration of the rotor caused by dry friction.

The impact of ambient temperature and humidity on the life of the motor is often underestimated. In a high temperature and high humidity environment, the insulation resistance of the motor winding may drop sharply due to water vapor penetration, resulting in the risk of inter-turn short circuit. To this end, the product has a built-in environmental adaptive protection module, which works in conjunction with the temperature and humidity sensor and the barometer: when the ambient temperature is detected to exceed the safety threshold, the cooling time after the motor is shut down is automatically extended; if the humidity sensor triggers an alarm, the internal airflow circulation program is started to discharge the water vapor in the cavity through the one-way air guide valve.

In addition, foreign body intrusion protection adopts a multi-stage barrier design: the primary filter intercepts large particles, the secondary cyclone separator captures fine dust, and the electromagnetic anti-entanglement grid at the motor air inlet can identify and repel conductive foreign matter such as metal wire and hair to prevent them from being sucked into the motor cavity and causing short circuits or rotor jams. Users need to regularly check the sealing rubber ring at the connection between the roller brush and the dust box to prevent hair from penetrating into the motor shaft seal area.