Fuel pump and its brushless motor assembly

Abstract

The invention relates to a brushless motor component and a fuel pump using the brushless motor component. The brushless motor component comprises a stator, two fixing covers and a rotor. The stator component a stator core and a winding, wherein the stator core has an inwards extended tooth; and the winding is wound on the tooth. The two fixing covers are sleeved to the two ends of the stator respectively, and are in close fit with the peripheral surface of the stator and the inner surface of a pump shell. The rotor comprises a rotating shaft and a magnet fixed relative to the rotating shaft, and can be arranged in the stator, wherein the two ends of the rotating shaft are supported by the two fixing covers respectively. The brushless motor component is formed by assembling the motor stator and the motor rotor by the plastic fixing covers, is convenient to package and transport, and when applied to the fuel pump, can simplify the assembly work of the fuel pump and increase assembly speed. In addition, the plastic fixing covers serve as dampers between the motor and the pump shell, so the fuel pump provided by the invention has slighter vibration and lower noises.

Description

technical field [0001] The present invention relates to fuel pumps, and more particularly to brushless motors for fuel pumps. Background technique [0002] The brushless fuel pump mainly includes a brushless motor and a pump wheel driven by the brushless motor. The motor and the pump wheel are installed in the pump casing, and the pump casing is usually used as the casing of the motor. [0003] Currently, motors, pump wheels, and pump casings are usually provided by different suppliers. This means that if the fuel pump uses an inner rotor brushless motor, then the motor supplier provides two components, the outer stator and the inner rotor, which brings difficulties to packaging and transportation: if the stator and rotor are packaged separately It will not only significantly increase the packaging cost and transportation cost, but also the strong magnetic field of the magnetic rotor will also cause electromagnetic interference to the transportation equipment; if the rotor ...

AI Technical Summary

Problems solved by technology

Because the rotor has a strong magnetic field, the rotor is easily attracted to the stator, which increases the difficulty of assembly

[0004] In addition, unlike brushed DC motors, for brushless motors, the armature core and windings are fixed in the pump casing. Therefore, the electromagnetic vibration generated by the alternating current of the stator windings when the motor is running will be directly transmitted to the pump casing, resulting in general no The brush motor fuel pump has a large vibration

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