CN117791967A - Nacelle propulsion motor cooling structure - Google Patents

Abstract

The invention discloses a nacelle propulsion motor cooling structure, which comprises a stand, a stator and a rotor, wherein the stator and the rotor are arranged in the stand, the stator consists of an iron core, a straight-line section winding and an end winding, and the rotor consists of a rotor shaft, a rotor yoke part and a rotor permanent magnet magnetic pole; and a spray cooling system consisting of a pump group, a connecting pipeline and a spray header is arranged at the end winding in the machine base. The invention can realize that the heat of the stator and rotor heating components of the motor propelled by the nacelle propeller is completely transferred to the sea water through the outer surface of the engine base by the internal self-circulation cooling loop, the stator end winding can be efficiently cooled without adopting expensive encapsulation or introducing external circulation cooling medium, and meanwhile, the heat dissipation of the surface of the rotor is taken into account.

Description

Nacelle propulsion motor cooling structure

Technical Field

The invention belongs to the technical field of electric propulsion of ships and ocean engineering, and particularly relates to a cooling structure of a nacelle propulsion motor.

Background

The pod propeller is a highly integrated ship electric propeller device, which integrates a propulsion motor and a propeller, and is placed outside a cabin together, wherein the propulsion motor is generally a permanent magnet motor, and a rotor is composed of permanent magnets.

The nacelle propeller has simple and compact overall structure, small volume and flexible installation. The smaller the propulsion motor of the pod propeller is, the smaller the overall hub diameter ratio is, the higher the overall hydrodynamic efficiency is, and the lighter the weight is, the lower the installation difficulty is.

At present, although the outer surface of the propulsion motor is soaked in seawater and can be cooled, the heat of an end winding of a stator needs to be firstly transmitted back to a straight-line section of an iron core and then transmitted to a stand, so that the thermal resistance is large, meanwhile, the heat of a rotor magnetic pole is difficult to dissipate, and the local temperature is easy to be too high after a long time. Some motors are very high in cost and long in time and have the risk of cracking by integrally encapsulating the end part of a stator, or the designed thermal load of the motor is reduced, but the volume and the weight are increased, or an external cooling medium is introduced, but the motor needs to pass through the slip ring part of the nacelle propeller, the structure is very complex, a secondary cooling system is also required to be arranged in a cabin, the volume and the weight are occupied, and the difficulty of the system is also increased.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a cooling structure of a nacelle propulsion motor, which aims at optimizing the heat dissipation problem of a stator end winding and a rotor.

In order to achieve the above purpose, the technical scheme adopted by the invention for solving the technical problems is as follows: the cooling structure of the nacelle propulsion motor comprises a stand, a stator and a rotor, wherein the stator and the rotor are arranged in the stand, the stator consists of an iron core, a straight-line section winding and an end winding, and the rotor consists of a rotor shaft, a rotor yoke part and a rotor permanent magnet magnetic pole; the inner end winding of the machine base is provided with a spray cooling system consisting of a pump group, a connecting pipeline and a spray header, the spray header sprays oil to directly cool the relevant areas of the end parts of the stator and the rotor, the heated oil falls into the lower part of the machine base to exchange heat to the outer surface of the machine base, after being cooled by outside seawater, the heated oil is pumped back to the spray cooling system by the pump group, and the heated oil is sprayed out through the spray header to form internal self-circulation cooling.

In the nacelle propulsion motor cooling structure, an axial or spiral cooling channel is arranged on the inner wall of a machine base, and the iron core and the rotor yoke are provided with the axial cooling channel.

According to the nacelle propulsion motor cooling structure, the base is further provided with the liquid level meter, and the pump group can adjust the rotating speed of the pump group according to the feedback signal of the liquid level meter to freely adjust the liquid level height according to the requirement.

The cooling structure of the nacelle propulsion motor has a plurality of groups of spray heads which face the end winding, the rotor and the pump group respectively.

According to the nacelle propulsion motor cooling structure, the filter can be arranged at the inlet of the pump group according to the requirement.

According to the nacelle propulsion motor cooling structure, the pump unit is arranged at the position close to the end cover of the engine base through the oil pump mounting seat as far as possible, and the end cover is correspondingly provided with the maintenance window.

The beneficial effects of the invention are as follows: through setting up spray set at motor stator rotor tip position, through the relevant position of fluid cooling, the fluid after the heating passes through the pump package, through the cooling channel of frame or stator rotor yoke, is cooled down again by the sea water and spouts, and inside self-looses and self-cooling oil duct of having formed, does not need extra cooler and external interface, has improved the cooling effect, has reduced the volume weight of motor, has promoted holistic efficiency.

Drawings

Fig. 1 is a general structural view of a first embodiment of the present invention;

fig. 2 is a schematic diagram of oil circulation according to a first embodiment of the present invention.

The reference numerals are as follows: 1-stand, 21-iron core, 23-end winding, 3-rotor, 31-rotor shaft, 4-spray cooling system, 41-pump group, 42-connecting pipeline, 43-spray header, 44-liquid level meter, 45-mounting rack, 46-filter, 47-oil pump mounting seat, 48-oil injection device oil inlet.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention. For example, although the various components in the figures are drawn to a particular scale, these scale relationships are merely exemplary and may be adjusted as needed by one skilled in the art to suit a particular application.

It should be noted that, in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "inner", "outer", and the like indicate directions or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific orientation, be configured or operated in a specific orientation, and thus should not be construed as limiting the present invention.

Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be connected inside two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.

Referring to fig. 1 and 2, the cooling structure of the nacelle propulsion motor disclosed by the invention comprises a stand 1, a stator and a rotor 3, wherein the stator and the rotor are arranged in the stand 1, the unit consists of a stand frame and a stand internal pipeline, the stator consists of an iron core 21, a straight-line section winding and an end winding 23, and the rotor 3 consists of a rotor shaft 31, a rotor yoke part and a rotor permanent magnet pole; the inner part of the machine base 1 is provided with a spray cooling system 4 consisting of a pump group 41, a connecting pipeline 42 and a spray header 43 at the end winding 23, the spray header 43 arranged near the end winding 23 sprays oil to directly cool the relevant areas at the end parts of the stator and the rotor 3, the heated oil falls into the lower part of the machine base 1 to exchange heat to the outer surface of the machine base 1 to be cooled by outside seawater, and then the heated oil is pumped back to the spray cooling system 4 by the pump group 41 and sprayed out through the spray header 43 to form an internal self-circulation cooling system. The heat of the stator linear segment winding is radiated to the sea water through the outer surface of the machine base, meanwhile, a certain liquid level height can be kept in the machine base, the magnetic poles on the surface of the rotor can be cooled, the liquid level height can be freely adjusted according to the needs by adjusting the rotating speed of the pump set according to the signal feedback of the set liquid level height meter.

The inner wall of the machine base 1 is provided with an axial or spiral cooling channel, and the iron core 21 and the rotor yoke are provided with the axial cooling channel. The internal passage of the engine base 1 is used for conveying and cooling oil, and the passage can be processed or filled with a pipeline and then soldered; the shape of the device can be a straight pipe or a spiral pipeline which circulates reciprocally; the passage of the stator/rotor yoke may be formed by a space or a hollow between the stator/rotor yoke and the inner surface of the housing 1, or may be a pipe of the rotor yoke.

The machine base 1 is also provided with a liquid level meter 44, after oil is introduced into the pump set 41 through an oil inlet 48 of the oil injection device, the pump set 41 adjusts the rotating speed of the pump set 41 according to a feedback signal of the liquid level meter 44 to freely adjust the liquid level according to requirements, so that the liquid level at the lower part of the machine base 1 can be ensured to be kept at a certain height, and the outer surface of the rotor 3 and a stator part immersed in the liquid level can be cooled. The oil level at the bottom of the stand 1 can be specifically designed according to the requirement, and is generally arranged at the high point of the outer surface of the immersed pump set 41 or the outer surface of the rotor 3, and the oil level can be lowered or raised according to the requirement, and the liquid level height can be freely adjusted by arranging the liquid level gauge 44 and then controlling the rotating speed of the pump set 41 according to the requirement through a feedback signal of the liquid level gauge.

The spray heads 43 are provided with a plurality of groups, are supported by the mounting frame 45 and face the end winding 23, the rotor 3 and the pump group 41 respectively, the pump group 41 can be sprayed and cooled through a special pipeline, and the spray heads 43 can spray the stator and rotor end winding 23 or only spray part of areas according to the needs.

A filter 46 can be arranged at the inlet of the pump group 41 according to the need; the pump unit 41 is arranged at a position close to the end cover of the machine base 1 through the oil pump mounting seat 47 as much as possible, and a maintenance window is correspondingly arranged on the end cover, so that the replacement and maintenance of the pump unit 41 and the filter 46 thereof can be realized.

This patent is through neotype cooling structure, solves the not good refrigerated problem in local position of propulsion motor, and the inside realization cold and hot self-loopa of structure does not need external interface, has reduced the volume weight of motor simultaneously, has improved the overall efficiency of nacelle propeller. The invention further improves the torque density of the motor and reduces the volume and weight of the motor on the premise of ensuring the high-efficiency cooling performance of the propeller motor.

The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and some practical embodiments, and variations and modifications may be made by those skilled in the art without departing from the inventive concept, which are all within the scope of the present invention.

Claims (6)

1. The cooling structure of the nacelle propulsion motor comprises a machine base (1) and a stator and a rotor (3) which are arranged in the machine base (1), wherein the stator consists of an iron core (21), a straight-line section winding and an end winding (23), and the rotor (3) consists of a rotor shaft (31), a rotor yoke part and a rotor permanent magnet magnetic pole; the method is characterized in that: the automatic cooling machine is characterized in that a spray cooling system (4) consisting of a pump set (41), a connecting pipeline (42) and a spray header (43) is arranged at the end winding (23) in the machine base (1), the spray header (43) sprays oil to directly cool the ends of the stator and the rotor (3), heated oil falls down and is cooled by outside seawater, and then is pumped back to the spray cooling system (4) by the pump set (41), and the oil is sprayed out through the spray header (43) to form internal self-circulation cooling.

2. A nacelle propulsion motor cooling structure according to claim 1, characterized in that the inner wall of the foundation (1) is provided with axial or spiral cooling channels, and that the core (21) and the rotor yoke are provided with axial cooling channels.

3. A nacelle propulsion motor cooling structure according to claim 1, characterized in that the foundation (1) is further provided with a level gauge (44), the pump unit (41) adjusting the rotational speed to adjust the level according to the feedback signal of the level gauge (44).

4. A nacelle propulsion motor cooling structure according to claim 1 or 2 or 3, characterized in that the shower heads (43) have a plurality of groups, each towards the end winding (23), the rotor (3) and the pump stack (41).

5. A nacelle propulsion motor cooling structure according to claim 4, characterized in that a filter (46) is arranged at the inlet of the pump stack (41).

6. A nacelle propulsion motor cooling structure according to claim 5, characterized in that the pump group (41) is arranged close to the end cover of the machine base (1) by means of an oil pump mounting (47), on which end cover a service window is arranged.