阅读说明：本技术 一种节约电机轴向空间的设计方法 (Design method for saving axial space of motor ) 是由 李睿 黄月寿 李刚 欧阳菊珍 易勇 何铎 于 2021-02-23 设计创作，主要内容包括：本发明公开了一种节约电机轴向空间的设计方法,属于电机领域,包括如下步骤：线圈绕组前、后预留5mm电气空间,确定电机内空间；设计连接支架将转子与电机轴链接；设计止退装置藏于连接支架内部；于前端盖设计用于安装前轴承的第一轴承室,于后端盖设计用于安装后轴承的第二轴承室；于连接支架内前、后端分别设计第一环形腔和第二环形腔,将前、后轴承及密封装置、反馈装置分别藏于连接支架内部第一、二环形腔内。发明所涉及的方法适用于车载、船舶等行业在许多安装空间有限的情况下的电机,使电机结构简单、安全性高,大大节约轴向空间,降低电机重量,提高电机散热性能。(The invention discloses a design method for saving the axial space of a motor, which belongs to the field of motors and comprises the following steps: reserving 5mm of electric space in front of and behind the coil winding to determine the space in the motor; designing a connecting bracket to link the rotor and the motor shaft; the retaining device is designed to be hidden in the connecting bracket; the front end cover is designed to be used for installing a first bearing chamber of a front bearing, and the rear end cover is designed to be used for installing a second bearing chamber of a rear bearing; a first annular cavity and a second annular cavity are respectively designed at the front end and the rear end in the connecting support, and the front bearing, the rear bearing, the sealing device and the feedback device are respectively hidden in the first annular cavity and the second annular cavity in the connecting support. The method is suitable for the motors in the industries of vehicles, ships and the like under the condition of limited installation space, so that the motor has a simple structure and high safety, the axial space is greatly saved, the weight of the motor is reduced, and the heat dissipation performance of the motor is improved.)

1. The utility model provides a practice thrift motor axial space's design method, the motor includes front end housing, rear end cap, motor housing, stator, rotor, motor shaft, front bearing, rear bearing, feedback device, the stator includes stator core and coil winding, the rotor includes rotor core and rotor support, its characterized in that: the design method comprises the following steps:

1) determining the size of an inner cavity of the motor according to the length of a stator core and the length of the end parts of two sides of a coil winding, and reserving 5-10 mm of electric spaces between the front end part and the rear end part of the coil winding and between the front end cover and the rear end cover respectively;

2) the design of a connecting bracket is adopted between the rotor and the motor shaft, the connecting bracket is fixedly connected with the rotor bracket through the design, and the rotor iron core is connected with the motor shaft, wherein the motor shaft and the connecting bracket are in interference fit, and a retaining device is arranged in the front end of the connecting bracket, so that the axial space in the motor is saved, and the retaining device is in interference fit with the motor shaft;

3) designing a first bearing chamber in the front end cover according to the size of the front bearing for mounting the front bearing, arranging the front bearing in the first bearing chamber, designing a second bearing chamber in the rear end cover according to the size of the rear bearing for mounting the rear bearing, and arranging the rear bearing in the second bearing chamber;

4) designing a first annular cavity between the front end of the connecting support and the motor shaft, determining the size of the first annular cavity according to the sizes of the front end cover and the first bearing chamber, and hiding the rear end of the front end cover and the front bearing in the first annular cavity;

5) the feedback device is arranged at the front end of the rear bearing and is fixedly connected with the rear end cover through the design of the feedback support, the second annular cavity is designed between the rear end of the connecting support and the motor shaft, the size of the second annular cavity is determined according to the size of the rear end cover, the size of the second bearing chamber, the size of the feedback device and the size of the feedback support, and the rear bearing, the feedback device and the feedback support are hidden inside the second annular cavity.

2. The design method for saving the axial space of the motor according to claim 1, wherein: the front bearing rear end and the rear bearing front end are also provided with sealing devices, a first sealing groove which is designed in the front end cover according to the size of the sealing devices and used for installing the sealing devices and a second sealing groove which is designed in the feedback support and used for installing the sealing devices are designed in the first annular cavity and the second annular cavity respectively.

3. The design method for saving the axial space of the motor according to claim 1, wherein: the flat key is arranged between the connecting bracket and the motor shaft for connection, so that the connecting bracket and the motor shaft are fixedly connected more firmly.

4. The design method for saving the axial space of the motor according to claim 1, wherein: the feedback device adopts a rotary transformer, and the front bearing and the rear bearing both adopt closed maintenance-free bearings.

5. The design method for saving the axial space of the motor according to claim 1, wherein: the rear end of the feedback support is provided with a circular boss for positioning the front end of the rear bearing, the rear end of the rear bearing is provided with a bearing positioning cover for positioning, and the bearing positioning cover is fixedly connected with the rear end cover.

6. The design method for saving the axial space of the motor according to claim 1, wherein: the connecting support is provided with a plurality of through holes which are uniformly distributed in the circumferential direction and used for reducing the weight of the connecting support on the premise of ensuring the strength.

7. A design method for saving axial space of an electric machine according to any one of claims 1 to 6, wherein: and a spiral cooling water tank is arranged on the outer side wall of the motor shell, and cold water which circularly flows is arranged in the spiral cooling water tank and used for heat dissipation of the motor.

8. The design method for saving the axial space of the motor according to claim 7, wherein: the motor shaft is internally provided with a hollow structure, and cooling oil which circularly flows is arranged in the hollow structure and used for heat dissipation of the motor.

9. The design method for saving the axial space of the motor according to claim 7, wherein: gaps between the front end of the coil winding and the front end cover and gaps between the rear end of the coil winding and the rear end cover are filled and sealed by epoxy resin, and 5-6 mm electric spaces are reserved between the front end part and the rear end part of the coil winding and between the front end cover and the rear end cover.

Technical Field

The invention relates to a design method for saving the axial space of a motor, belongs to the technical field of motors, and particularly relates to a motor which is applied to the industries of vehicles, ships and the like under the condition of limited installation space.

Background

In many situations where the installation space is limited, such as in the vehicle, ship and other industries, the size of the motor is often very limited, and especially the axial space is often very compact. In order to ensure the performance of the motor, the axial space of the motor is fully utilized as far as possible in the design process under the condition that the length of the iron core is not shortened.

The axial space of the traditional motor is mainly occupied by an iron core, a bearing, a feedback device, a heat dissipation device and the like, certain gaps are reserved among parts of the traditional motor to ensure the reliability and the safety of operation, the axial overall size of the motor is large, and when the installation space is limited, the length of the motor cannot meet the requirement easily. Therefore, a design method for saving the axial space of the motor needs to be researched.

Disclosure of Invention

The invention aims to provide a design method for saving the axial space of a motor aiming at the current situation of the requirement of industries such as vehicle-mounted industry, ship industry and the like on the axial size of the motor. The method has the advantages of simple structure, high safety, axial space saving, weight reduction and the like.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a practice thrift motor axial space's design method, the motor includes front end housing, rear end cap, motor housing, stator, rotor, motor shaft, front bearing, rear bearing, feedback device, the stator includes stator core and coil winding, the rotor includes rotor core and rotor support, its characterized in that: the design method comprises the following steps:

1) determining the size of an inner cavity of the motor according to the length of a stator core and the length of the end parts of two sides of a coil winding, and reserving 5-10 mm of electric spaces between the front end part and the rear end part of the coil winding and between the front end cover and the rear end cover respectively;

2) the design of a connecting bracket is adopted between the rotor and the motor shaft, the connecting bracket is fixedly connected with the rotor bracket through the design, and the rotor iron core is connected with the motor shaft, wherein the motor shaft and the connecting bracket are in interference fit, and a retaining device is arranged in the front end of the connecting bracket, so that the axial space in the motor is saved, and the retaining device is in interference fit with the motor shaft;

3) designing a first bearing chamber in the front end cover according to the size of the front bearing for mounting the front bearing, arranging the front bearing in the first bearing chamber, designing a second bearing chamber in the rear end cover according to the size of the rear bearing for mounting the rear bearing, and arranging the rear bearing in the second bearing chamber;

4) designing a first annular cavity between the front end of the connecting support and the motor shaft, determining the size of the first annular cavity according to the sizes of the front end cover and the first bearing chamber, and hiding the rear end of the front end cover and the front bearing in the first annular cavity;

5) the feedback device is arranged at the front end of the rear bearing and is fixedly connected with the rear end cover through the design of the feedback support, the second annular cavity is designed between the rear end of the connecting support and the motor shaft, the size of the second annular cavity is determined according to the size of the rear end cover, the size of the second bearing chamber, the size of the feedback device and the size of the feedback support, and the rear bearing, the feedback device and the feedback support are hidden inside the second annular cavity.

Furthermore, the rear end of the front bearing and the front end of the rear bearing are also provided with sealing devices, a first sealing groove which is designed in the front end cover according to the size of the sealing devices and used for installing the sealing devices is arranged, a second sealing groove which is designed in the feedback device connecting support and used for installing the sealing devices is arranged, and the sealing devices are respectively hidden in the first annular cavity and the second annular cavity.

Furthermore, a flat key is arranged between the connecting support and the motor shaft for connection, so that the connecting support and the motor shaft are fixedly connected more firmly.

Furthermore, because of the feedback device is located inside the motor, certain difficulty exists during the dismantlement, so the rotary transformer that the reliability is higher than photoelectric encoder is adopted in the feedback device design, and front bearing and rear bearing all adopt closed non-maintaining bearing.

Furthermore, a circular boss is arranged at the rear end of the feedback support and used for positioning the front end of the rear bearing, a bearing positioning cover is designed at the rear end of the rear bearing and used for positioning, and the bearing positioning cover is fixedly connected with the rear end cover.

Furthermore, a plurality of through holes which are uniformly distributed in the circumferential direction are formed in the connecting support, so that the weight of the connecting support is reduced on the premise of ensuring the strength.

Further, a motor shell is arranged on the outer side of the middle of the motor, a spiral cooling water tank is arranged on the outer side wall of the motor shell, and cold water which flows circularly is arranged in the spiral cooling water tank and used for heat dissipation of the motor.

Furthermore, the motor shaft is internally provided with a hollow structure, and cooling oil which circularly flows is arranged in the hollow structure and used for heat dissipation of the motor.

Furthermore, gaps between the front end of the coil winding and the front end cover and gaps between the rear end of the coil winding and the rear end cover are filled and sealed by epoxy resin, and 5-6 mm electric spaces are reserved between the front end part and the rear end part of the coil winding and between the front end cover and the rear end cover respectively. The epoxy resin has high heat conductivity coefficient and good insulating property, so that after the epoxy resin is adopted for encapsulation, the heat dissipation performance of the coil winding is improved, and a smaller electric space can be reserved.

The invention has the beneficial effects that: the structure is simple, the safety is high, the axial space is saved, the weight is reduced, and the heat dissipation performance is good; 1) the rotor core is connected with the motor shaft by arranging the connecting bracket, and the front bearing, the rear bearing, the sealing device and the feedback device are all hidden in the connecting bracket, so that the axial space can be effectively saved; 2) the anti-back device is arranged, so that the rotor is positioned better, and the anti-back device is hidden in the connecting bracket, so that the axial space is not occupied; 3) the connecting bracket is provided with the plurality of through holes, so that the weight can be effectively reduced on the premise of ensuring the strength; 4) the spiral cold water tank is arranged on the shell, the motor shaft is hollow, and cooling oil is introduced into the hollow part, so that the heat dissipation function of the motor is greatly improved; 5) the gaps in the front and the back of the coil winding are encapsulated by epoxy resin, so that the heat dissipation performance of the coil winding is improved, and the axial space of the motor is further saved.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a connection bracket and motor shaft according to an embodiment of the present invention;

FIG. 3 is a schematic view of a connection structure of a rotor frame and a connection frame according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a rear bearing, a sealing device, and a feedback device according to an embodiment of the invention.

FIG. 5 is a schematic structural diagram of a second embodiment of the present invention;

FIG. 6 is a schematic view of a key connection structure of a second connecting bracket and a motor shaft according to an embodiment of the present invention.

In the figure: 1. the bearing comprises a front end cover, 101, a first bearing chamber, 102, a first sealing groove, 2, a front bearing, 3, a rotor support, 301, a boss, 4, a sealing device, 5, a retaining device, 6, a stator core, 7, a connecting support, 701, a first annular cavity, 702, a counter bore, 703, a second annular cavity, 704, a spigot, 705, a lightening hole, 8, a motor shaft, 9, a rotor core, 10, a feedback device, 11, a feedback support, 1101, a second sealing groove, 12, a bearing positioning cover, 13, a rear end cover, 1301, a second bearing chamber, 14, a coil winding, 15, a rear bearing, 16, a flat key, 17, a motor shell, 1701, a spiral water tank, 18 and epoxy resin.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention.

The embodiment of the invention provides a design method for saving the axial space of a motor, the motor comprises a front end cover 1, a rear end cover 13, a motor shell 17, a stator, a rotor, a motor shaft 8, a front bearing 2, a rear bearing 15, a feedback device 10, a sealing device 4 and a connecting support 7, the stator comprises a stator iron core 6 and a coil winding 14, the rotor comprises a rotor iron core 9 and a rotor support 3, and the feedback device 10 comprises a feedback support 11.

As shown in fig. 1 to 4, the first embodiment specifically includes the following steps:

1) determining the size of the inner cavity of the motor according to the length of the stator core 6 and the length of the end parts of two sides of the coil winding 14, and reserving electric spaces with the space S of 10mm between the front end part of the coil winding 14 and the front end cover 1 and between the rear end part of the coil winding and the rear end cover 13;

2) a connecting support 7 is designed between a rotor and a motor shaft 8, a spigot 704 is arranged on the front end face of the connecting support 7, a boss 301 is arranged on the rear end face of the rotor support 3, the boss 301 is arranged in the spigot 704, the connecting support 7 and the rotor support 3 are fastened and connected through bolt threads, an inner hole of the connecting support 7 is fixedly connected with an outer circular face of the motor shaft 8 in an interference fit manner, a rotor iron core 9 is connected with the motor shaft 8, a counter bore 702 is arranged at the center of the inner front end of the connecting support 7, a retaining device 5 is designed to be hidden in the counter bore 702, the retaining device 5 is designed to be a circular ring, the inner hole of the circular ring is fixedly connected with the outer circular face of the motor shaft in the interference fit manner, the connecting support 7 can be effectively prevented from moving;

3) the front bearing 2 is arranged in the first bearing chamber 101 which is designed in the inner side surface of the front end cover 1 according to the size of the front bearing 2 and is used for installing the front bearing 2, the front bearing 2 is arranged in the first bearing chamber 101, the inner ring of the front bearing 2 is fastened with the outer side surface corresponding to the motor shaft 8, and the outer ring is fastened with the inner side surface of the first bearing fixing 101;

the rear bearing 15 is arranged in a second bearing chamber 1301 which is designed in the inner side face of the rear end cover 13 according to the size of the rear bearing 15 and used for installing the rear bearing 15, the rear bearing 15 is arranged in the second bearing chamber 1301, the same ring of the rear bearing 15 is fastened with the outer side face corresponding to the motor shaft 8, and the outer ring is fastened with the second bearing chamber 1301;

4) the front bearing 2 is further provided with a sealing device 4 at the rear end, a first sealing groove 102 is designed in the inner side surface of the front end cover 1 according to the size of the sealing device 4 and used for installing the sealing device 4, and the sealing device 4 is arranged in the first sealing groove 102.

5) The feedback device 10 is arranged at the front end of the rear bearing 15, the feedback support 11 and the rear end cover 13 are designed to be fastened through bolt threads, the sealing device 4 is further arranged at the front end of the rear bearing 15, the second sealing groove 1101 is designed in the inner side face of the feedback support according to the size of the sealing device 4 and used for installing the sealing device 4, and the sealing device 4 is arranged in the second sealing groove 1101.

6) A first annular cavity 701 is designed between the front end of the connecting bracket 7 and the motor shaft 8, the size of the first annular cavity 701 is determined according to the sizes of the front end cover 1, the first bearing chamber 101 and the first sealing groove 102, and the rear end of the front end cover 1, the front bearing 2 and the sealing device 4 are hidden in the first annular cavity 701;

7) a second annular cavity 703 is designed between the rear end of the connecting bracket 7 and the motor shaft 8, the size of the second annular cavity 703 is determined according to the sizes of the rear end cover 13, the second bearing chamber 1301, the feedback device 10 and the feedback bracket 11, and the rear bearing 15, the feedback device 10, the feedback bracket 11 and the sealing device 4 are all hidden in the second annular cavity 703;

8) a circular boss 1102 is arranged on the rear end face of the feedback support 11, the front end of the rear bearing 15 is positioned through the circular boss 1102, a bearing positioning cover 12 is designed at the rear end of the rear bearing 15 for positioning, and the bearing positioning cover 12 is fixedly connected with the rear end cover 13 through bolts.

9) Because the feedback device 10 is located inside the motor, there is certain difficulty in the dismantlement, so the feedback device 10 design adopts the resolver that the reliability is higher than photoelectric encoder, and front bearing 2 and rear bearing 15 all adopt closed non-maintaining bearing.

Preferably, 8 through holes 705 with the diameter of 16mm are uniformly distributed on the connecting support 7 in the circumferential direction, so that the weight of the connecting support 7 is reduced on the premise of ensuring the strength of the connecting support 7.

Preferably, a spiral cooling water tank 1701 is provided on an outer side wall of the motor housing 17, and cold water circulating in the spiral cooling water tank 1701 is provided for heat dissipation of the motor stator.

Preferably, the motor shaft 8 is internally provided with a hollow structure, and cooling oil which circulates and flows is arranged in the hollow structure and used for heat dissipation of a motor rotor.

In the embodiment of the invention, the front bearing 2, the rear bearing 15, the sealing device 4 and the feedback device 10 are all hidden in the connecting bracket 7, so that the axial space is greatly saved, the heat dissipation device adopts the spiral cooling water tank 1701 to cool the water and the motor shaft 8 hollow structure to cool the oil, the heat dissipation effect is good, and the axial space is not occupied. The first embodiment of the invention has the advantages of simple structure, high safety, axial space saving, weight reduction, good heat dissipation performance and the like.

As shown in fig. 5 and 6, the second embodiment of the present invention is substantially the same as the first embodiment, except that a flat key 16 is further disposed between the connecting bracket 7 and the motor shaft 8 for connection, so that the connecting bracket 7 and the motor shaft 8 are more firmly fixed; gaps between the front end of the coil winding 14 and the front end cover 1 and between the rear end of the coil winding 14 and the rear end cover 13 are filled and sealed by epoxy resin 18, the epoxy resin 18 has good heat-conducting property and is beneficial to heat dissipation of the coil winding 14, the epoxy resin 18 is an insulating material, and the reserved electric spaces between the front end part and the rear end part of the coil winding 14 and between the front end cover and the rear end cover can be a little bit and 5mm, so that the axial space of the motor can be further shortened.

In the second embodiment of the invention, the front bearing 2, the rear bearing 15, the sealing device 4 and the feedback device 10 are all hidden in the connecting bracket 7, so that the axial space is greatly saved, the heat dissipation device adopts the spiral cooling water tank 1701 to cool the water and the motor shaft 8 hollow structure to cool the oil, the heat dissipation effect is good, and the axial space is not occupied; meanwhile, the front end and the rear end of the coil winding 14 are encapsulated by epoxy resin 18, so that the heat dissipation performance is further improved, and the axial space of the motor is saved. The second embodiment of the invention has the advantages of simple structure, high safety, axial space saving, weight reduction, good heat dissipation performance and the like.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.