A pod propulsion motor cooling structure

Abstract

The application discloses a kind of pod propulsion motor cooling structure, including machine base and the stator and rotor being arranged in machine base, the stator is composed of core, straight section winding and end winding, the rotor is composed of rotor shaft, rotor yoke and rotor permanent magnet pole;The machine base is in the end winding place and is provided with the spray cooling system consisting of pump group, connecting pipeline and spray head by pump group, connecting pipeline and spray head.The application can realize that pod propeller propulsion motor stator rotor heat component heat is all passed to seawater through machine base outer surface by internal self-circulation cooling circuit, and end winding of stator does not need to use expensive filling, or can be introduced to external circulating cooling medium to obtain efficient cooling, while giving consideration to rotor surface heat dissipation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of ship and ocean engineering technology electric propulsion, and particularly relates to a kind of pod propulsion motor cooling structure. BACKGROUND

[0002] Pod propeller is a kind of highly integrated ship electric propulsion device, which integrates propeller motor and propeller together and places them outside the cabin. The propeller motor is generally a permanent magnet motor, and the rotor is composed of permanent magnets.

[0003] Pod propeller has simple and compact overall structure, small size and flexible installation. The smaller the propeller 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, and the smaller the installation difficulty is.

[0004] Although the outer surface of the propeller motor is immersed in seawater for cooling, the heat of the end winding of the stator needs to be transmitted back to the iron core straight section first and then to the motor frame, and the thermal resistance is very large. At the same time, it is difficult to dissipate the heat of the rotor magnetic pole, and the local temperature is prone to be too high after a long time. Some motors are completely sealed at the end of the stator, which is very costly and has the risk of cracking after a long time. Alternatively, the thermal load of the motor is designed to be small, but the volume and weight will increase. Alternatively, an external cooling medium is introduced, but it needs to pass through the slip ring part of the pod propeller, which has a very complex structure and also needs to be equipped with a secondary cooling system in the cabin, which occupies volume and weight and increases the system difficulty. SUMMARY

[0005] In order to solve the above problems in the prior art, the present application proposes a kind of pod propulsion motor cooling structure, which optimizes the heat dissipation of the stator end winding and the rotor.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application to solve its technical problems is as follows: a kind of pod propulsion motor cooling structure, comprising a motor frame and a stator and a rotor arranged in the motor frame, the stator is composed of an iron core, a straight section winding and an end winding, the rotor is composed of a rotor shaft, a rotor yoke and a rotor permanent magnet pole, the motor frame is provided with a spray cooling system composed of a pump set, a connecting pipeline and a spray head at the end winding, the spray head sprays oil to directly cool the relevant area of the end of the stator and the rotor, the heated oil falls into the lower part of the motor frame to exchange heat to the outer surface of the motor frame, which is cooled by the seawater outside, and then is pumped back to the spray cooling system by the pump set and is sprayed out by the spray head to form an internal self-circulation cooling.

[0007] The motor frame inner wall of the pod propulsion motor cooling structure is provided with an axial or spiral cooling channel, and the iron core and the rotor yoke are provided with an axial cooling channel.

[0008] The machine base is also provided with a liquid level meter, and the pump group adjusts the rotating speed of the pump group according to the feedback signal of the liquid level meter to freely adjust the liquid level according to needs.

[0009] The spray head has multiple groups, and is respectively directed to the end winding, the rotor and the pump group.

[0010] The pump group inlet can be arranged with a filter according to needs.

[0011] The pump group is arranged at a position close to the end cover of the machine base through the oil pump mounting seat, and a maintenance window is correspondingly arranged on the end cover.

[0012] The beneficial effects of the present application are: by arranging the spraying device at the end part of the motor stator and rotor, the related parts are cooled by oil, the heated oil is pumped through the cooling channel of the machine base or the stator rotor yoke, and is sprayed out again after being cooled by seawater, forming a self-circulation and self-cooling oil channel, without the need for additional coolers and external interfaces, improving the cooling effect, reducing the volume and weight of the motor, and improving the overall efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a general structure diagram of the first embodiment of the present application.

[0014] Figure 2 It is an oil circulation schematic diagram of the first embodiment of the present application.

[0015] The reference signs are: 1 - machine base, 21 - core, 23 - end winding, 3 - rotor, 31 - rotor shaft, 4 - spraying cooling system, 41 - pump group, 42 - connecting pipeline, 43 - spraying head, 44 - liquid level meter, 45 - mounting frame, 46 - filter, 47 - oil pump mounting seat, 48 - oil inlet of oil spraying device. DETAILED DESCRIPTION

[0016] Hereinafter, the embodiments of the present application 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 only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application. For example, although each component in the drawings is drawn in a specific proportion, these proportion relationships are only exemplary, and those skilled in the art can adjust them according to needs in order to adapt to specific application occasions.

[0017] It should be noted that in the description of the present application, the terms "center", "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or position shown in the drawings, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed or operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0018] In addition, it should be noted that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the connection between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0019] Referring to Figure 1 , Figure 2 The present application discloses a kind of pod propulsion motor cooling structure, including stator and rotor 3 of machine base 1 and being arranged in machine base 1, machine group is made of machine base frame and machine base internal pipeline, the stator is made of core 21, straight segment winding and end winding 23, the rotor 3 is made of rotor shaft 31, rotor yoke and rotor permanent magnet pole;The machine base 1 is provided with spray cooling system 4 by pump group 41, connecting pipeline 42 and spray head 43 at end winding 23, the spray head 43 arranged in the vicinity of end winding 23 sprays oil liquid to directly cool stator and rotor 3 end related area, heated oil liquid falls into the lower part of machine base 1 to exchange heat to the outer surface of machine base 1, which is cooled by outside seawater, then is pumped back to spray cooling system 4 by pump group 41, and is sprayed out by spray head 43, forming internal self-circulation cooling system. The heat of stator straight segment winding is dissipated to seawater through the outer surface of machine base, while the liquid level height in machine base can be maintained, the magnetic pole on the surface of rotor can be cooled, and according to the signal feedback of the set liquid level gauge, the liquid level height can be freely adjusted as needed by adjusting the rotating speed of pump group.

[0020] The inner wall of the machine base 1 is provided with an axial or spiral cooling channel, and the core 21 and the rotor yoke are provided with an axial cooling channel. The internal passage of the machine base 1 is used to transport and cool oil, which can be machined or embedded with pipes and then tinned; its shape can be a reciprocating straight pipe or a spiral pipe; the passage of the stator rotor yoke can be formed by the gap or cavity between the stator rotor yoke and the inner surface of the machine base 1, or it can be a pipe of the rotor yoke.

[0021] The base 1 is further provided with a liquid level meter 44, and after oil is introduced into the pump set 41 through the oil inlet 48 of the oil injection device, the pump set 41 adjusts the rotating speed of the pump set 41 according to the feedback signal of the liquid level meter 44 to freely adjust the liquid level according to the requirement, so that the liquid level in the lower part of the base 1 can be kept at a certain height to cool the outer surface of the rotor 3 and the part of the stator immersed therein. The oil level at the bottom of the base 1 can be designed according to the requirement, and is generally set at the high point of the part of the pump set 41 or the outer surface of the rotor 3 immersed therein, and can be lowered or raised according to the requirement. This can be achieved by setting the liquid level meter 44, and then freely adjusting the liquid level according to the requirement by controlling the rotating speed of the pump set 41 through the feedback signal thereof.

[0022] The spray head 43 has multiple groups, is supported by the mounting frame 45, and is respectively directed towards the end winding 23, the rotor 3 and the pump set 41. The pump set 41 can be sprayed and cooled through a special pipeline, and the spray head 43 can be sprayed towards the end winding 23 of the stator and rotor according to the requirement, or only sprayed in part of the area.

[0023] The pump set 41 can be provided with a filter 46 at the inlet thereof according to the requirement; the pump set 41 is arranged at a position close to the end cover of the base 1 through the oil pump mounting seat 47, and a maintenance window is correspondingly arranged on the end cover, so that the pump set 41 and the filter 46 thereof can be replaced and maintained.

[0024] The patent solves the problem of poor cooling of local parts of the propulsion motor through a novel cooling structure, realizes self-circulation of cold and heat in the structure, does not need external interfaces, reduces the volume and weight of the motor, and improves the overall efficiency of the podded propulsor. The application further improves the torque density of the motor and reduces the volume and weight of the motor under the premise of ensuring the high-efficiency cooling performance of the propulsor motor.

[0025] The above embodiments only exemplarily illustrate the principles and effects of the application and some applied embodiments, and those skilled in the art can make several modifications and improvements without departing from the inventive concept, and these all belong to the protection scope of the application.

Claims

1. A cooling structure for a podded propulsion motor, comprising a base (1) and a stator and a rotor (3) disposed within the base (1), wherein the stator is composed of an iron core (21), a straight section winding and an end winding (23), and the rotor (3) is composed of a rotor shaft (31), a rotor yoke and rotor permanent magnet poles; characterized in that: The inner wall of the base (1) is provided with axial or spiral cooling channels. The iron core (21) and rotor yoke are provided with axial cooling channels. The base (1) is also provided with a level gauge (44). The pump group (41) adjusts the speed according to the feedback signal of the level gauge (44) to adjust the liquid level. The base (1) is provided with a spray cooling system (4) consisting of a pump group (41), connecting pipes (42) and spray heads (43) at the end winding (23). There are multiple sets of spray heads (43). The end winding (23), rotor (3) and pump set (41) are arranged in the direction of the end winding (23), the rotor (3) and the pump set (41). The filter (46) is arranged at the inlet of the pump set (41). The pump set (41) is arranged at the end cover near the base (1) through the oil pump mounting seat (47). The end cover is provided with a maintenance window. The spray head (43) sprays oil to directly cool the stator and rotor (3) ends. The heated oil falls down and is cooled by the outside seawater. Then it is pumped back to the spray cooling system (4) by the pump set (41) and sprayed out through the spray head (43) to form an internal self-circulating cooling system.

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