阅读说明：本技术 一种适用于闭口转子槽感应电机的复合材料导条转子 (Composite material conducting bar rotor suitable for closed rotor slot induction motor ) 是由 鲍晓华 燕婧文 程帅 李佳欣 柯喆 刘佶炜 于 2020-06-19 设计创作，主要内容包括：本发明公开了一种适用于闭口转子槽感应电机的复合材料导条转子,包括转子铁心、内层导条、外层导条,其中：转子铁心上开有闭口槽,内层导条和外层导条沿转子铁心的径向设在闭口槽内,内层导条相对外层导条靠近转子铁心的轴线,即靠近气隙的为外层导条,外层导条和内层导条由不同导电导磁材料制成。本发明所提出的转子,转子铁心上层导条具有高磁导率,使得电机转动过程中出现的磁桥饱和效应减小；同时优化电机气隙磁密正弦度,减小气隙磁密谐波；进而电机的径向电磁力谐波得到减小,径向电磁力引起的振动减小；电机整体电磁振动与噪声得到减小；本发明结构简单,减低噪声效果明显,通用性广泛。(The invention discloses a composite material conducting bar rotor suitable for a closed rotor slot induction motor, which comprises a rotor core, an inner layer conducting bar and an outer layer conducting bar, wherein: the rotor core is provided with a closed slot, the inner layer conducting bar and the outer layer conducting bar are arranged in the closed slot along the radial direction of the rotor core, the inner layer conducting bar is close to the axis of the rotor core relative to the outer layer conducting bar, namely the outer layer conducting bar is close to the air gap, and the outer layer conducting bar and the inner layer conducting bar are made of different conducting and magnetic materials. According to the rotor provided by the invention, the conducting strip on the upper layer of the rotor core has high magnetic conductivity, so that the magnetic bridge saturation effect in the rotating process of the motor is reduced; meanwhile, the sine degree of the air gap flux density of the motor is optimized, and the air gap flux density harmonic is reduced; further, the harmonic wave of the radial electromagnetic force of the motor is reduced, and the vibration caused by the radial electromagnetic force is reduced; the overall electromagnetic vibration and noise of the motor are reduced; the invention has simple structure, obvious noise reduction effect and wide universality.)

1. The utility model provides a combined material conducting bar rotor suitable for closed rotor slot induction machine which characterized in that: including rotor core, inlayer gib block, outer gib block, wherein:

the rotor core is provided with a closed groove, an inner layer conducting bar and an outer layer conducting bar are arranged in the closed groove along the radial direction of the rotor core, the inner layer conducting bar is close to the axis of the rotor core relative to the outer layer conducting bar, and the outer layer conducting bar and the inner layer conducting bar are made of different conducting and magnetic materials.

2. The composite bar rotor for a closed rotor slot induction machine of claim 1, wherein: the magnetic permeability of the outer layer conducting bar is higher than that of the inner layer conducting bar.

3. The composite bar rotor for a closed rotor slot induction machine of claim 1, wherein: the outer layer conducting bar is made of cobalt, and the inner layer conducting bar is made of aluminum or copper.

4. The composite bar rotor for a closed rotor slot induction machine of claim 1, wherein: the thickness of the outer layer conducting bar is smaller than that of the inner layer conducting bar.

5. The composite bar rotor for a closed rotor slot induction machine of claim 1, wherein: the outer layer conducting bar and the inner layer conducting bar are fixed in a metal adhesive bonding or welding mode.

6. The composite bar rotor for a closed rotor slot induction machine of claim 1, wherein: the end ring is arranged at the end part of the rotor core and is connected with the outer-layer conducting bars and the inner-layer conducting bars in a welding mode.

7. The composite bar rotor for a closed rotor slot induction machine of claim 6, wherein: the material of the end ring is the same as that of the inner layer conducting bar.

Technical Field

The invention relates to the technical field of motors, in particular to a composite material conducting bar rotor suitable for a closed rotor slot induction motor.

Background

The commonly used induction motor rotor bars at present are aluminum bars and copper bars. Due to the influence of the working environment, a closed rotor groove is adopted in part of the motor. The vibration noise problem of the motor influences production and life, and electromagnetic vibration and noise are main sources of the vibration noise of the motor. Meanwhile, the magnetic bridge saturation phenomenon of the closed slot induction motor in the operation process can increase air gap flux density harmonic waves and increase motor vibration and noise.

Disclosure of Invention

The invention aims to provide a composite material conducting bar rotor suitable for a closed rotor slot induction motor, which can effectively reduce the magnetic bridge saturation phenomenon effect of a closed slot, reduce the magnetic density harmonic wave of an air gap of the motor, further reduce the radial electromagnetic force harmonic wave of the motor and reduce the electromagnetic vibration and noise of the motor.

The purpose of the invention is realized by the following technical scheme:

the utility model provides a combined material conducting bar rotor suitable for closed rotor slot induction machine, includes rotor core, inlayer conducting bar, outer conducting bar, wherein: the rotor core is provided with a closed slot, the inner layer conducting bar and the outer layer conducting bar are arranged in the closed slot along the radial direction of the rotor core, the inner layer conducting bar is close to the axis of the rotor core relative to the outer layer conducting bar, namely the outer layer conducting bar is close to the air gap, and the outer layer conducting bar and the inner layer conducting bar are made of different conducting and magnetic materials.

As a further optimization scheme of the invention, all closed slots of the rotor core are provided with the inner layer conducting bars and the outer layer conducting bars.

As a further optimization scheme of the invention, the magnetic conductivity of the outer layer conducting bars is higher than that of the inner layer conducting bars, and a magnetic circuit can reduce the saturation degree of the rotor core close to an air gap through the outer layer conducting bars, reduce the leakage flux of the motor and improve the operation reliability of the motor.

As a further optimization scheme of the invention, the outer layer conducting bar material is a cobalt material, the magnetic permeability of the cobalt material is greater than that of the aluminum material and the copper material, the magnetic circuit can reduce the saturation degree of the rotor core close to the air gap through the outer layer conducting bar, the inner layer conducting bar material is the aluminum material or the copper material, the aluminum material and the copper material have low cost, the magnetic permeability is less than that of the cobalt material, the leakage flux of the motor is reduced, and the operation reliability of the motor is improved.

As a further optimization scheme of the invention, the thickness of the outer-layer conducting bar is smaller than that of the inner-layer conducting bar, so that the saturation effect of the motor is effectively reduced and the motor has excellent performance.

As a further optimization scheme of the invention, the outer-layer conducting bar and the inner-layer conducting bar are bonded or welded into a whole by adopting metal glue, and the outer-layer conducting bar and the inner-layer conducting bar cannot move mutually after being changed into a whole.

As a further optimization scheme of the invention, the motor further comprises an end ring, wherein the end ring is arranged at the end part of the rotor core and is welded with the outer-layer conducting bars and the inner-layer conducting bars, so that the end ring, the outer-layer conducting bars and the inner-layer conducting bars are integrated to form a rotor loop, induced current is generated, and the motor operates normally.

As a further optimization scheme of the invention, the material of the connecting end ring is the same as that of the inner-layer conducting bar, so that the running reliability of the motor is improved.

The invention has the beneficial effects that:

according to the composite material conducting bar rotor suitable for the closed rotor slot induction motor, the conducting bar on the upper layer of the rotor core has high magnetic conductivity, so that the magnetic bridge saturation effect in the rotation process of the motor is reduced; meanwhile, the sine degree of the air gap flux density of the motor is optimized, and the air gap flux density harmonic is reduced; further, the harmonic wave of the radial electromagnetic force of the motor is reduced, and the vibration caused by the radial electromagnetic force is reduced; the overall electromagnetic vibration and noise of the motor are reduced; the invention has simple structure, obvious noise reduction effect and wide universality.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.

FIG. 1 is a schematic cross-sectional structural view of a composite material bar rotor;

FIG. 2 is an enlarged view of a portion A of FIG. 1;

FIG. 3 is a schematic view of a composite material bar rotor bar and end ring configuration;

FIG. 4 is a schematic cross-sectional structure of an aluminum bar rotor;

FIG. 5 is a graph comparing the noise sound pressure level of a composite bar rotor motor to the noise sound pressure level of an aluminum bar rotor motor.

Reference numbers in the figures: 1 rotor core, 2 outer layer bars, 3 inner layer bars, 2/3 outer and inner layer bars, 4 rotor outer diameter, 5 magnetic bridge area, 6 end ring, 7 aluminum bars, a partial area.

Detailed Description

The present application will now be described in further detail with reference to the drawings, it should be noted that the following detailed description is given for illustrative purposes only and is not to be construed as limiting the scope of the present application, as those skilled in the art will be able to make numerous insubstantial modifications and adaptations to the present application based on the above disclosure.

As shown in fig. 1, the present invention provides a composite material bar rotor. The cross section of the rotor shows a rotor core 1, an outer layer conducting bar 2 and an inner layer conducting bar 3; a closed slot along the radial direction of the rotor core 1 is formed in the rotor core 1, an outer layer conducting bar 2 and an inner layer conducting bar 3 are arranged in the closed slot along the radial direction of the rotor core, and the inner layer conducting bar 3 is close to the axis of the rotor core 1; the outer layer conducting bar 2 is made of cobalt material; the inner layer conducting bar 3 is made of aluminum material; the magnetic conductivity of the outer layer conducting bar 2 is larger than that of the inner layer conducting bar 3; adopt the welding mode to make between outer conducting bar 2 and the inlayer conducting bar 3 both be a whole, can not remove each other after outer conducting bar 2 and inlayer conducting bar 3 become a whole. The partial region a includes the rotor core 1, the outer layer bars 2, and the inner layer bars 3.

As shown in fig. 2, the area between the rotor outer diameter 4 and the outer layer conducting bar 2 is a magnetic bridge area 5; the thickness of the outer layer conducting bar 2 is a; the total thickness of the inner layer conducting bar 3 and the outer layer conducting bar 2 is b; the rotor composite material conducting bar meets the following requirements: and a/b is 0.17. When the closed slot motor rotates, the magnetic flux density of the magnetic bridge area 5 is increased, and the magnetic bridge area 5 is often saturated. By using the composite conducting bar, the saturation phenomenon of the magnetic bridge region 5 is reduced due to the high magnetic conductivity of the outer layer conducting bar 2, so that the air gap flux density harmonic wave is reduced, the electromagnetic vibration and noise of the motor are reduced, and the integral vibration and noise of the motor are effectively reduced.

As shown in fig. 3, the rotor core of the present invention further includes an end ring 6, the end ring 6 is provided at an end of the rotor core 1, the end ring 6 is welded to the outer layer bar and the inner layer bar 2/3, the material of the end ring 6 is the same as that of the inner layer bar 3, and the material of the end ring 6 is an aluminum material.

As shown in fig. 4, which is a structural view of a rotor of the related art, an aluminum bar 7 is provided in a closed slot of a rotor core.

As shown in fig. 5, it can be seen from the curve of the noise sound pressure level with frequency variation of the 6-pole closed rotor slot induction motor with the number of stator slots 72 and the number of rotor slots 58 when having the aluminum bar rotor and the composite bar rotor: the maximum value of the noise sound pressure level of the aluminum conducting bar rotor motor is 117.6 dB; the maximum value of the noise sound pressure level of the composite material conducting bar rotor motor is 106.2 dB; the composite material conducting bar rotor motor reduces the air gap flux density harmonic wave of the motor due to the reduction of the saturation effect, reduces the radial force harmonic wave, and effectively reduces the noise of the motor.

The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.