阅读说明：本技术 能够减小横向漏电流损耗的感应电机转子及制备方法 (Induction motor rotor capable of reducing transverse leakage current loss and preparation method thereof ) 是由 谢颖 毛攀 徐煜文 于 2019-09-05 设计创作，主要内容包括：一种能够减小横向漏电流损耗的感应电机转子及制备方法,涉及感应电机的转子领域。本发明是为了解决故障时的感应电机在启动过程中会产生高损耗的横向漏电流,进而导致转子局部发热、损坏绝缘层的问题。本发明所述的一种能够减小横向漏电流损耗的感应电机转子,转子铁芯同轴套接在转轴上,转子铁芯的外圆周上均匀设置有多个导条,导条的长度均与转子铁芯的长度相同,转子铁芯的两端均设有端环；转子铁芯与导条之间设有过渡层,过渡层两端与端环之间设有绝缘层,使其绝缘于端环。本发明适用于鼠笼式感应电机中。(An induction motor rotor capable of reducing transverse leakage current loss and a preparation method thereof relate to the field of rotors of induction motors. The invention aims to solve the problems that the induction motor in fault generates high-loss transverse leakage current in the starting process, so that the rotor is locally heated and an insulating layer is damaged. According to the induction motor rotor capable of reducing the transverse leakage current loss, the rotor core is coaxially sleeved on the rotating shaft, the outer circumference of the rotor core is uniformly provided with the plurality of conducting bars, the length of each conducting bar is the same as that of the rotor core, and the two ends of the rotor core are provided with the end rings; a transition layer is arranged between the rotor iron core and the conducting bars, and an insulating layer is arranged between two ends of the transition layer and the end ring to insulate the end ring. The invention is suitable for the squirrel-cage induction motor.)

1. An induction machine rotor capable of reducing lateral leakage current loss, comprising: the rotor comprises a rotor core (3) and a rotating shaft (5), wherein the rotor core (3) is coaxially sleeved on the rotating shaft (5), a plurality of conducting bars (2) are uniformly arranged on the outer circumference of the rotor core (3), the lengths of the conducting bars (2) are the same as the length of the rotor core (3), and end rings (1) are arranged at two ends of the rotor core (3);

it is characterized in that the preparation method is characterized in that,

a transition layer (4) is arranged between the rotor core (3) and the guide bar (2), and an insulating layer is arranged between two ends of the transition layer (4) and the end ring (1).

2. The rotor of an induction machine capable of reducing the lateral leakage current loss according to claim 1, characterized in that the transition layer (4) is a sheet of silicon steel.

3. An induction machine rotor capable of reducing lateral leakage current loss, comprising: the rotor comprises a rotor core (3) and a rotating shaft (5), wherein the rotor core (3) is coaxially sleeved on the rotating shaft (5), a plurality of conducting bars (2) are uniformly arranged on the outer circumference of the rotor core (3), the lengths of the conducting bars (2) are the same as the length of the rotor core (3), and end rings (1) are arranged at two ends of the rotor core (3);

it is characterized in that the preparation method is characterized in that,

transition layers (4) are arranged between the rotor iron core (3) and the guide bars (2), and insulating layers are arranged between two ends of each transition layer (4) and the end rings (1) and between the transition layers (4) and the rotor iron core (3).

4. The rotor of an induction machine capable of reducing the lateral leakage current loss according to claim 3, characterized in that the transition layer (4) is a sheet of silicon steel.

5. A method of manufacturing a rotor for an induction motor according to claim 3,

the transition layer (4) is manufactured by a mould, the outer surface of the transition layer (4) is evenly coated with an insulating layer,

the rotor iron core (3) is laminated by using silicon steel sheets, meanwhile, the transition layer (4) is laminated into the iron core,

the conducting bars (2) and the end rings (1) are formed by casting aluminum juice.

Technical Field

The invention belongs to the field of motors, and particularly relates to a rotor of an induction motor.

Background

When designing the squirrel-cage induction motor, in order to reduce the motor running loss, weaken asynchronous additional torque and reduce the purpose such as noise, induction motor adopts the chute technique more, but behind the chute because the air gap magnetic density skew in the motor, can produce extra loss again, the motor stray loss can increase.

In the normal operation process of the induction motor, the proportion of the lateral leakage current loss occupying the stray loss is small. However, when the motor fails, particularly during the starting of the motor, the lateral leakage current loss reaches a non-negligible level. In addition, the transverse leakage current can cause the problems of local heating of the rotor, damage of an insulating layer and the like.

Disclosure of Invention

The invention provides an induction motor rotor capable of reducing transverse leakage current loss and a preparation method thereof, aiming at solving the problems that high-loss transverse leakage current is generated in the starting process of an induction motor during fault, so that the rotor is locally heated and an insulating layer is damaged.

The invention discloses an induction motor rotor capable of reducing transverse leakage current loss, which comprises the following two schemes:

the first scheme is as follows:

an induction machine rotor capable of reducing lateral leakage current loss, comprising: the rotor comprises a rotor core and a rotating shaft, wherein the rotor core is coaxially sleeved on the rotating shaft, a plurality of conducting bars are uniformly arranged on the outer circumference of the rotor core, the length of each conducting bar is equal to that of the rotor core, and end rings are arranged at two ends of the rotor core; a transition layer is arranged between the rotor iron core and the conducting bars, and insulating layers are arranged between two ends of the transition layer and the end rings.

In the first scheme, the transition layer in the induction motor rotor is a silicon steel sheet.

The second scheme is as follows:

an induction machine rotor capable of reducing lateral leakage current loss, comprising: the rotor comprises a rotor core and a rotating shaft, wherein the rotor core is coaxially sleeved on the rotating shaft, a plurality of conducting bars are uniformly arranged on the outer circumference of the rotor core, the length of each conducting bar is equal to that of the rotor core, and end rings are arranged at two ends of the rotor core; and a transition layer is arranged between the rotor core and the conducting bars, and insulating layers are arranged between two ends of the transition layer and the end rings and between the transition layer and the rotor core.

In the second scheme, the transition layer in the induction motor rotor is a silicon steel sheet.

The preparation method of the induction motor rotor in the second scheme comprises the following steps:

the transition layer is made by a mould, the outer surface of the transition layer is evenly coated with an insulating layer,

the rotor core is laminated by using silicon steel sheets, and simultaneously, the transition layer is laminated into the core,

the conducting bars and the end rings are formed by aluminum juice casting.

In order to limit the transverse leakage current in the motor operation process and reduce the transverse leakage current loss, the invention provides the induction motor rotor capable of reducing the transverse leakage current loss. The induction motor rotor can achieve the purpose of limiting the loss of the transverse leakage current by changing the path of the transverse leakage current.

Drawings

Fig. 1 is a schematic perspective view of an induction motor rotor according to the present invention;

FIG. 2 is a schematic view of an induction motor rotor of the present invention with one end ring removed;

FIG. 3 is a schematic end view of an induction motor rotor according to the present invention;

fig. 4 is an enlarged view of a portion E of fig. 3.

Detailed Description

Lateral leakage current: after the chute technology is adopted, the air gap magnetic field which is axially symmetrical is subjected to skew, different induced electromotive forces are generated under different positions along the axial direction for the same rotor conducting bar, different induced currents are generated under the action of a loop, and therefore the air gap magnetic field can be known through kirchhoff's law: there will be a current flow along the rotor surface, and this current flow transversely across the rotor surface is called a transverse leakage current.

After a rotor model and a row rotor equation are established, the transverse leakage current loss in the skewed slot cage motor is related to the skewed slot degree and the transverse leakage resistance of the motor. According to the final loss calculation, the numerical value of the transverse leakage current loss and the contact resistance are found to be in a nonlinear relation, the transverse leakage current loss is increased firstly along with the increase of the transverse leakage resistivity and is reduced after reaching the maximum value, and the corresponding resistivity when the maximum loss is called as rho₀。

In the actual process of manufacturing the squirrel-cage motor, such as aluminum casting and welding, the lateral leakage current resistance has a large relationship with the process, and has a large uncertainty, and in order to stably deviate the lateral leakage current resistance from the resistivity at the time of maximum loss, the resistance on the lateral leakage current path must be increased in order to reduce the loss of the lateral leakage current. The present invention is described in detail with reference to the following embodiments, taking a squirrel cage induction motor rotor as an example.