Oil-cooled high-voltage brushless direct-current motor for aviation fuel system

Abstract

The invention provides an oil-cooled high-voltage brushless direct-current motor for an aviation fuel system. The oil-cooled high-voltage brushless direct-current motor comprises a Hall sensor assembly for backup starting, a composite shaft with a pressurization cooling function, a stator assembly, a rotor assembly, a shaft extension end cover assembly, a machine shell, a non-shaft extension end cover assembly with a flange function and a pressurization impeller. Fuel oil in the motor is divided into two oil paths, wherein the first oil path is the fuel oil inlet of the machine shell, the airgap shaft surfaces of the stator assembly and the rotor assembly and the gap between the composite shaft and the shaft extension end cover assembly and finally reaches the supercharging impeller, andthe second oil path is the fuel oil inlet of the machine shell, the oil inlet of the non-shaft extension end cover assembly, the oil inlet, the inner hole and the oil outlet of the composite shaft andfinally reaches the supercharging impeller. The motor has the advantages of being small in size, light in weight, long in service life, good in heat dissipation and cooling effect and high in workingefficiency.

Description

technical field [0001] The invention belongs to the design field of aviation high-voltage brushless DC motors, and relates to an oil-cooled high-voltage brushless DC motor. Background technique [0002] At present, in aviation fuel or fuel delivery systems, low-voltage DC motors and asynchronous motors are generally used, and air cooling is mostly used for cooling. At present, more and more fuel or fuel delivery systems require motors to meet the requirements of small size, light weight, good heat dissipation, and long life. The existing aviation fuel system low-voltage DC motors and asynchronous motors have the following problems: [0003] 1. There are problems with low-voltage DC motors: [0004] 1), large volume [0005] Due to the use of low-voltage DC power supply, under the same electric power, the required current is larger, that is, the cross-sectional area required for the armature winding is larger, and the volume of other components corresponding to the rotor i...

AI Technical Summary

Problems solved by technology

[0005] Due to the use of low-voltage DC power supply, under the same electric power, the required current is larger, that is, the cross-sectional area required for the armature winding is larger, and the volume of other components corresponding to the rotor is also increased. When the same electric power is input, the required volume of the motor will increase. Big

[0006] 2), heavy weight

[0008] 3), short life

[0009] Because low-voltage DC motors need to achieve mechanical commutation through components such as armatures, commutators, and brushes, these components are prone to frictional heat and electrical heating due to mechanical friction. Even if the self-contained cooling fan is used, the heat cannot be dissipated in time. , leading to a reduction in the insulation of the current-carrying conductors, thereby shortening the service life

[0010] 4) Poor heat dissipation and cooling effect

[0014] When an asynchronous motor is used to drive a mechanical load (AC fuel or oil pump), it is usually started directly with an AC power supply. When starting directly, in order to be able to withstand a large starting current, the cross-sectional area of ​​the armature winding also needs to be increased. The electromagnetic density of the cage or wound rotor is relatively low. If the electromagnetic density is low, more electromagnetic materials will be consumed to complete the conversion of electrical power and mechanical power, and the occupied volume will increase.

Therefore, the volume of the asynchronous motor is relatively large

[0015] 2) Poor cooling effect

[0016] Asynchronous motors generally use natural air cooling or cooling fans for cooling and heat dissipation. This cooling method has low efficiency and cannot quickly reduce the temperature rise of the stator and rotor of the motor when the motor is working, and the heat dissipation and cooling effect is poor.

[0017] 3), low efficiency

[0018] When the asynchronous motor is working, due to the relatively low power factor, the output active power is low, and at the same time, due to the poor heat dissipation and cooling effect, the heat loss is large, resulting in low efficiency of the asynchronous motor

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