CN216564683U - A double-slope rotor intermediate ring assembly - Google Patents

Abstract

The invention discloses an intermediate ring assembly of a double oblique groove rotor, comprising an intermediate ring and a gasket, which is characterized in that the section of the intermediate ring is trapezoidal. The intermediate ring of the utility model changes the cross section to a trapezoidal shape, the electric density distribution near the intermediate ring is more uniform during the use process, the electromagnetic performance will not be lost on the basis that the cross-sectional area does not change, and the contact between the intermediate ring and the guide bar is increased in disguised form. Area, the maximum thermal stress point is also changed from the connection of the middle ring bar where the common middle ring is prone to breakage to the middle of the bar, which effectively avoids the broken bar failure caused by thermal stress, so that the rotor with double inclined grooves is good. Under the premise of high electromagnetic performance, the structural stability of the intermediate ring is ensured, the deformation stress damage of the intermediate ring is reduced, and its service life is prolonged.

Description

A double-slope rotor intermediate ring assembly

technical field

The present invention relates to the technical field of double-slope rotors, in particular to an intermediate ring assembly of a double-slope rotor.

Background technique

The traditional double-slope rotor induction motor has many advantages. By setting the appropriate inclination angle and interlaced angle of the upper and lower bars, the axial force on the rotor of the induction motor and the air-gap harmonics of a specific order can be effectively weakened. Effectively reduce the vibration and noise of the induction motor. The rotor intermediate ring introduced due to the staggered double-slope rotor is prone to large thermal stress potential failures due to poor heat dissipation in the middle of the motor. Double-slope motors are mostly in high-frequency working environment, so the skin effect of the middle ring is more obvious, and the current density in the upper part of the middle ring section is relatively large. The thicker intermediate ring reduces the local thermal load but reduces the electromagnetic performance, while the thinner intermediate ring leads to thermal latent failures. Simply thickening and thinning the intermediate ring thickness is not optimal for this motor.

SUMMARY OF THE INVENTION

The purpose of this patent for the utility model is to propose a new type of double-slope rotor intermediate ring and its gasket. Compared with the traditional intermediate ring and gasket, the structure is better after comprehensively considering thermal performance and electromagnetic performance. By increasing the upper part of the intermediate ring area to optimize the electrical density distribution of the intermediate ring, thereby optimizing the performance of the double-slope induction motor.

In order to achieve the above object, the technical scheme adopted by the present utility model is:

A double inclined groove rotor intermediate ring assembly, characterized in that it includes an intermediate ring and a gasket thereof, wherein:

The outer side of the gasket is provided with an accommodating ring groove;

The gasket is arranged in the accommodating ring groove, and the intermediate ring is matched with the accommodating ring groove;

The thickness of the intermediate ring gradually becomes thicker from the side close to the axis of the intermediate ring to the side away from the axis of the intermediate ring.

As a further optimized solution of the present invention, the gasket and the intermediate ring are coaxial, and the gasket and the intermediate ring are not coaxial, and the electromagnetic performance of the coaxial motor is better.

As a further optimized solution of the present invention, the section of the intermediate ring along its axial direction is an isosceles trapezoid.

As a further optimized solution of the present invention, the gasket is made of cast steel material, which is convenient to increase the strength of the rotor.

As a further optimized solution of the present invention, the middle ring is made of aluminum material by casting, which is convenient for production and manufacture, and the middle ring connects the upper guide bar of the upper rotor and the lower guide bar of the lower rotor, and the upper guide bar and the lower guide bar are both aluminum. material.

As a further optimized solution of the present invention, the thickness of the outer side of the intermediate ring is 2-6 mm, and the thickness of the inner side of the intermediate ring is 1.5-1.9 mm.

As a further optimized solution of the present invention, the gasket has a supporting part, an upper connecting part and a lower connecting part, wherein:

The upper connection part and the lower connection part are both connected with the support part, the upper connection part is located above the lower connection part, and an accommodating ring groove is formed between the upper connection part, the lower connection part and the support part.

In order to ensure the overall mechanical strength of the intermediate ring, the upper connecting part and the bottom of the lower connecting part of the gasket should not be too thin from the point of view of mechanical properties. During the casting process, pre-opening holes should be reserved in the guide bar for pouring aluminum liquid. The copper intermediate ring is made of die-casting, and the pre-opening of the guide bar only has the function of connecting the guide bar and does not have the function of pouring aluminum liquid. Therefore, the pre-opening of the guide bar of the gasket needs to be opened regardless of the material of the intermediate ring. Therefore, in order to ensure the strength of the gasket when punching the guide bar pre-drilling, the inclination angle of the trapezoidal hypotenuse of the trapezoidal intermediate ring should not be too small. If the inclination angle is too small, the upper and lower connecting parts of the gasket will be very thin. From the perspective of motor performance, the inclination angle of the trapezoidal hypotenuse of the trapezoidal intermediate ring should not be too large. If the inclination angle is too large, the intermediate ring at the connection will be melted at the pre-opening of the guide bar when the guide bar is poured, resulting in air bubbles and voids. Affect the electromagnetic performance and thermal performance of the motor.

As a further optimized solution of the present invention, the thickest thickness of the upper connecting portion and the lower connecting portion is 2-4 mm, thereby increasing the overall strength of the intermediate ring assembly.

As a further optimized solution of the present invention, both the upper connecting part and the lower connecting part are provided with pre-opening holes for the guide bars, and the pre-opening holes for the guide bars communicate with the accommodating ring grooves. Specifically, the pre-opening holes for the guide bars are connected to the upper rotor and the lower rotor The guide bars correspond one-to-one, which is convenient for the upper rotor and the lower rotor to connect the guide bars with the intermediate ring during the casting of the guide bars.

The beneficial effects of the present utility model are:

1. The cross-sectional shape of the intermediate ring of the present utility model is changed to a trapezoid, the upper surface area of the intermediate ring becomes larger, and the slot leakage inductance of the intermediate ring as a circumferential groove will be reduced, thereby resulting in the excellent performance of the double-slope induction motor. The performance will be further optimized, the efficiency will be improved, the power factor will be improved, and the starting torque will be larger;

2. The traditional gasket is made of silicon steel sheets for the purpose of weakening the influence of eddy currents, while the current in the middle ring is a circumferential current, and the magnetic field formed by it is an axial magnetic field. The silicon steel sheet is cut off, and the solid casting gasket does not need to consider weakening the eddy current; and the gasket is changed from silicon steel sheet to cast steel casting, which not only increases the rigidity of the rotor, but also reduces the manufacturing cost of the double-slope induction motor.

Additional aspects and advantages of the present invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or may be learned by practice of the invention.

Description of drawings

FIG. 1 is a schematic structural diagram of an intermediate ring assembly;

Fig. 2 is the sectional view of the utility model intermediate ring assembly;

3 is a schematic structural diagram of the middle ring and the upper and lower cage guide bars of the present invention;

Fig. 4 is the traditional middle ring structure and the utility model middle ring structure contrast schematic diagram;

FIG. 5 is a schematic structural diagram of the gasket in the intermediate ring assembly of the present invention.

Detailed ways

As shown in Figure 1-2, a double-slope rotor intermediate ring assembly includes an intermediate ring 1 and its gasket 2, wherein:

The outer side of the gasket 2 is provided with an accommodating ring groove 20, and the gasket 2 is cast from steel;

Specifically, the gasket 2 has a support part 200, an upper connection part 201 and a lower connection part 202, wherein: the upper connection part 201 and the lower connection part 202 are both connected with the support part 200, the upper connection part 201 is located above the lower connection part 202, A receiving ring groove 20 is formed between the upper connecting part 201, the lower connecting part 202 and the supporting part 200, the maximum thickness part of the upper connecting part 201 and the lower connecting part 202 is close to the axis of the gasket, and the upper connecting part 201 and the lower connecting part 202 The thickness of the maximum thickness part is 3mm;

The lower surface of the upper connecting portion 201 is flat to facilitate the connection of the gasket with the upper rotor, and the upper surface of the lower connecting portion 202 is flat to facilitate the gasket 2 to be connected to the lower rotor;

The intermediate ring 1 is set in the accommodating ring groove 20 by casting, and the intermediate ring 1 is cast from an aluminum material, and the intermediate ring 1 is matched with the accommodating ring groove 20, and the intermediate ring 1 and the gasket 2 are coaxial;

The thickness of the intermediate ring 1 gradually becomes thicker from the side close to the axis of the intermediate ring 1 to the side away from the axis of the intermediate ring 1 .

The thickness of the outer side of the intermediate ring 1 is 4mm, and the thickness of the inner side of the intermediate ring 1 is 1.7mm;

The upper connecting part 201 and the lower connecting part 202 are all provided with pre-opening holes 102 of the guide bars, and the pre-opening holes 102 of the guide bars are communicated with the accommodating ring groove;

As shown in Figure 3, the intermediate ring assembly is installed on the double inclined slot squirrel cage rotor. The intermediate ring assembly is installed between the upper rotor and the lower rotor, and the intermediate ring is used to connect the guide bars of the upper rotor and the lower rotor. The slot structure will effectively weaken the air gap harmonics of a specific order, thereby effectively weakening the synchronous additional torque caused by the harmonics and reducing the electromagnetic noise, and the existence of the intermediate ring 1 will cause the transverse current generated by the upper and lower inclined slot rotors in the intermediate ring 1. and the skin effect is obvious at the intermediate ring 1 due to the high frequency of the rotor current of the motor, resulting in serious saturation of the iron core near the surface of the intermediate ring. Therefore, we choose to increase the area of the upper and lower surfaces of the intermediate ring 1 to weaken the intermediate ring. The skin effect of the current makes the heat distribution in the middle of the double-slope induction motor more reasonable.

As shown in FIG. 4 , the cross-section of the existing intermediate ring along its axis direction is shown in (A), and the cross-section of the intermediate ring 1 in this embodiment is changed to the isosceles trapezoidal cross-section in (B). Among them, in the existing intermediate ring (A), N _IRS is the width of the rectangular intermediate ring, and M _IRS is the height of the rectangle, which is the height of the traditional intermediate ring. To ensure the electromagnetic performance, the cross-sectional area of the intermediate ring 1 should not change too much. The section (B) of the intermediate ring 1 in the embodiment keeps the thickness of the intermediate ring unchanged, that is, the same thickness _{MIRS as the traditional intermediate ring is adopted, N IRZU is} the outer thickness of the trapezoidal intermediate ring 1 , and N _IRZD is the inner thickness of the trapezoidal intermediate ring 1 .

In order to ensure that the clamp can not damage the upper connecting part 201 of the gasket 2 and the lower connecting part 202 of the gasket 2 when the reserved hole is punched, the thickness of the upper connecting part 201 and the lower connecting part 202 should be at least 2mm. It can be inferior to the upper and lower rotor cores. In order to ensure the electromagnetic performance of the intermediate ring 1, the upper connecting part 201 and the lower connecting part 202 should not be too thick, and should not exceed 4mm at most. In this embodiment, the maximum thickness of the upper connecting part 201 and the lower connecting part 202 is 3mm.

In order to weaken the more serious skin effect caused by the large current and high frequency of the intermediate ring 1, a trapezoidal cross-section intermediate ring 1 whose outer side height is greater than the inner side height of the intermediate ring 1 is selected. The magnetic field generated by the current is an axial magnetic field. The current of the intermediate ring 1 does not participate in the excitation. The overall thickness of the solid intermediate ring 1 should not be too thick. Too thick will cause the length of the upper and lower rotor bars of the actual excitation to be shortened equivalently. For small and medium-sized double-slope induction motors, it is recommended that the overall height of the intermediate ring should be about 6mm. Since the current flows evenly in the section during stable operation, it is only necessary to consider the skin effect of the intermediate ring during start-up operation. Therefore, in order to save material, choose a trapezoidal cross-section whose cross-sectional area remains unchanged but the area of the outer severe skin effect area increases, and the bottom of the groove of the intermediate ring 1 with no obvious skin effect, that is, the inner side of the intermediate ring 1 decreases at the same time. It is recommended that the outer height of the intermediate ring 1 is 2-6 mm, and the inner height of the intermediate ring 1 is 1.5-1.9 mm. In this embodiment, the outer height of the intermediate ring 1 is 4 mm, and the inner height of the intermediate ring 1 is 1.7 mm.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. The equivalent replacement or change of the inventive concept thereof shall be included within the protection scope of the present invention.

Claims (9)

1. The utility model provides a double chute rotor intermediate ring subassembly which characterized in that includes intermediate ring and gasket, wherein:

the outer side surface of the gasket is provided with an accommodating ring groove;

the gasket is arranged in the containing ring groove, and the middle ring is matched with the containing ring groove;

the thickness of the intermediate ring becomes thicker gradually from the side close to the axis of the intermediate ring to the side away from the axis of the intermediate ring.

2. The double chute rotor mid ring assembly as recited in claim 1, wherein the spacer is coaxial with the mid ring.

3. A double chute rotor intermediate ring assembly as claimed in claim 1, in which the intermediate ring is isosceles trapezoidal in cross section in its axial direction.

4. The double chute rotor mid ring assembly as recited in claim 1, wherein the shim is cast from a steel material.

5. The double chute rotor mid ring assembly as recited in claim 1, wherein the mid ring is cast of aluminum material.

6. The double chute rotor mid-ring assembly as claimed in claim 1, wherein the thickness of the outer side of the mid-ring is 2-6mm and the thickness of the inner side of the mid-ring is 1.5-1.9 mm.

7. The double chute rotor mid ring assembly of any one of claims 1 to 6 wherein the spacer has a spacer support portion, a spacer upper connection portion and a spacer lower connection portion, wherein:

the upper gasket connecting part and the lower gasket connecting part are connected with the gasket supporting part, the upper gasket connecting part is positioned above the lower gasket connecting part, and an accommodating ring groove is formed among the upper gasket connecting part, the lower gasket connecting part and the gasket supporting part.

8. The double chute rotor mid ring assembly as claimed in claim 7, wherein the shim upper and lower connection portions have a maximum thickness of 2-4 mm.

9. The double chute rotor mid-ring assembly as defined in claim 7, wherein the shim upper connection portion and the shim lower connection portion each have a pre-opening for the bar conductors, the pre-openings for the bar conductors communicating with the receiving ring groove.

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