Ultra-high speed three-phase axial flow fan

Abstract

The invention discloses an ultra-high speed three-phase axial flow fan, which comprises a stator assembly, a rotor assembly and an impeller, and is characterized in that the stator assembly is used for being connected with the rotor assembly inside and supporting the rotor assembly for rotation; the rotor assembly is used for generating a torque and rotating to generate a rotating torque; the impeller is used for generating a high-speed air flow and is driven by the rotor assembly to rotate; the stator assembly comprises a shell, the center of the shell is concentrically provided with a fixed ring, the inner wall of the fixed ring is fixedly connected with a layer of coils, and two ends of the fixed ring are provided with an upper bearing cover and a lower bearing cover respectively; and the rotor assembly comprises a rotating shaft sleeved on the upper bearing cover and the lower bearing cover, the middle part of the rotating shaft is provided with a magnetic core in a sleeved manner, and both ends of the magnetic core are provided with a counter weight. The ultra-high speed three-phase axial flow fan has the advantages of reasonable design, good stability, high operation efficiency, small size, good heat dissipation and the like.

Description

technical field [0001] The invention relates to a fan, in particular to an ultra-high-speed three-phase axial flow fan. Background technique [0002] With the mature application of lithium battery technology, the vacuum cleaner has developed from the original bulky form to the lightweight form, from AC power supply to DC power supply. The hand-held vacuum cleaner has good maneuverability, is easy to carry, is not limited by the power supply, is light, and can be operated flexibly. Therefore, high-end hand-held vacuum cleaners require the motor to be small in size and generate large negative pressure at high speed. The speed requirement of the motor can reach more than 50,000 revolutions. [0003] At present, the motors of handheld vacuum cleaners on the market are driven by DC brush motors, DC brushless motors, and permanent magnet single-phase synchronous motors, all of which are toothed motors. Cogging torque is the torque generated by the interaction between the perman...

AI Technical Summary

Problems solved by technology

[0006] When the frequency is consistent with the armature current resonance frequency, resonance will occur, which will inevitably amplify the vibration and noise of the cogging torque, seriously affecting the positioning accuracy and servo performance of the motor, especially at low speeds.

[0007] In the case of ultra-high speed, the commutation loss of the carbon brush is too large, and the carbon brush produces a large commutation spark. In the case of ultra-high speed, the wear of the carbon brush is accelerated, and the life efficiency is very low. The existing brushed motor cannot last a long time. Operates safely at ultra-high speeds

[0008] Disadvantages of existing brushless DC motors: large rotation pulsation, large cogging torque, and high motor rotation noise; disadvantages of existing permanent magnet single-phase synchronous motors: large rotation pulsation, large motor rotation noise, and low efficiency

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