TW201909523A - High-speed asynchronous motor rotor structure and motor comprising same - Google Patents

Abstract

A high-speed asynchronous motor rotor structure and a motor comprising same. The rotor structure comprises: a rotor core provided with an axial through hole in the center; first rotor end rings made of silicon steel sheets with high yield strength, abutted against the rotor core, and provided at both ends of the rotor core; second rotor end rings abutted against the ends of the first rotor end rings; a rotor bar provided at the peripheries of the rotor core, the first rotor end rings, and the second rotor end rings; and a rotating shaft provided in the axial through hole. By means of the structure, not only electromagnetic properties of the asynchronous motor are ensured, but also the mechanical strength of the rotor is greatly improved. Therefore, the maximum speed of the motor is increased, and high speed and miniaturization in motor design are more facilitated.

Description

 High speed non-synchronous motor rotor structure and motor including the same  

The present invention relates to the field of motor technology, and more particularly to a high speed non-synchronous motor rotor structure and a motor including the same.

A non-synchronous motor is an AC motor that converts electromechanical energy into mechanical energy by an electromagnetic variable that interacts with the induced current of the rotor winding to generate electromagnetic torque. In the existing various types of motor applications, the demand for non-synchronous motors is large. At present, the application of non-synchronous motors tends to be high speed and miniaturization. However, at high speeds, the bars and rotor end rings of non-synchronous motors are subjected to centrifugal force, and the bars or end rings are prone to breakage failure. When the broken guide bar will fly out, the stator is scratched, the stator insulation is damaged, and the stator is short-circuited, so that the motor is burned and damaged.

For safety reasons, in the prior art, a retaining ring structure is added at the rotor end ring. However, this solution requires additional processing and manufacturing, increases production costs, and increases the assembly time of the motor. In the prior art, a high-strength steel rotor end ring is disposed between the rotor core and the rotor end ring. However, the high-strength steel rotor end ring is usually thicker than 3 mm, which is difficult to manufacture and has difficulty in precision. Guarantee, mold life is short, in addition, because of its high yield strength (usually greater than 600MPa), the stamping of the steel rotor end ring mold manufacturing is difficult, high cost, precision requirements are also very high, for the manufacturer is A big challenge is that it is difficult to achieve mass production of high-strength steel rotor end rings. It can be seen that the technical solution of providing a high-strength steel rotor end ring between the rotor core and the rotor end ring has high cost and poor practicability.

The technical problem to be solved by the present invention is to provide a high-speed non-synchronous motor rotor structure and a motor including the same, which can improve the mechanical strength and safety reliability of the motor under high-speed operation while ensuring the electromagnetic performance of the non-synchronous motor. The motor is more suitable for operation at high speeds.

Another object of the present invention is to provide electromagnetic properties and mechanical properties of the motor at the same time by two different properties of the silicon steel sheet material. At the same time, the steel sheet has high stamping precision and long mold life, making it easier to achieve large-scale production.

In order to solve the above technical problem, the present invention provides a high speed non-synchronous motor rotor structure, comprising: a rotor core, the center of which is provided with an axial through hole; and a first rotor end ring made of a high yield strength silicon steel sheet, which is tight The rotor core is disposed at two ends of the rotor core; the second rotor end ring is disposed adjacent to the end of the first rotor end ring; the rotor bar is disposed at the rotor core, the first rotor end ring, and An outer circumference of the rotor end ring; and a rotating shaft disposed in the axial through hole.

Further, the rotating shaft is combined with the rotor core in an interference fit manner.

Further, the rotating shaft is axially provided with a convex shoulder, and the shoulder is in contact with the first rotor end ring.

Further, the outer circumferences of the rotor core, the first rotor end ring and the second rotor end ring are circumferentially provided with a guide hole for mounting the rotor bar, and the rotor bar is inserted into the bar hole.

Further, the guide bar holes are evenly distributed along the circumferential direction of the rotor core, the first rotor end ring and the second rotor end ring.

Further, the rotor core is formed by laminating a plurality of high-conductivity silicon steel sheets.

Further, the first rotor end ring is formed by laminating a plurality of high yield strength silicon steel sheets.

Further, the high permeability magnetic silicon steel sheet has a yield strength ranging from 330 MP to 400 MP, and the high yield strength silicon steel sheet has a yield strength higher than 600 MP.

Further, the high magnetic conductive silicon steel sheet has a thickness of 0.2 mm to 0.5 mm, and the high yield strength silicon steel sheet has a thickness of 0.5 mm to 1 mm.

Further, the rotor bar and the second rotor end ring are made of a high conductivity oxygen-free copper or copper alloy.

Further, the rotor bar and the second rotor end ring are fixed together.

Further, the rotor bar and the second rotor end ring are fixed together by welding.

According to another aspect of the invention, a non-synchronous electric machine is provided comprising the rotor structure.

The present invention has significant advantages and benefits over the prior art. According to the above technical solution, the rotor structure of the high-speed non-synchronous motor and the motor including the rotor structure of the invention can achieve considerable technical progress and practicability, and have extensive industrial use value, and at least have the following advantages:

1. The rotor core is made of high magnetic permeability silicon steel sheet to ensure the high electromagnetic performance of the motor.

2. The first rotor end ring at both ends of the rotor core is made of high-yield silicon steel sheet, which improves the mechanical strength of the rotor structure and makes the rotor structure resistant to centrifugal force, thereby increasing the running speed of the motor.

3. The rotor core is made of high magnetic permeability silicon steel sheet. The first rotor end ring at both ends of the rotor core is made of high-yield silicon steel sheet. The combination of two kinds of silicon steel sheet materials can realize the electromagnetic and mechanical properties of the motor. The mutual compatibility makes the motor increase the maximum speed of the motor under the premise of ensuring electromagnetic performance and mechanical performance.

4. At the same time, the steel sheet has high stamping precision and long mold life, which makes it easier to achieve large-scale production.

5. The invention makes the non-synchronous motor greatly improve the mechanical strength of the rotor under the premise of ensuring electromagnetic performance, thereby increasing the maximum rotational speed of the motor, and is more advantageous for realizing high speed and miniaturization of the motor design.

The above description is only an overview of the technical solutions of the present invention, and the above-described and other objects, features and advantages of the present invention can be more clearly understood. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings.

1‧‧‧Rotor core

2‧‧‧Rotor bars

3‧‧‧First rotor end ring

4‧‧‧Second rotor end ring

5‧‧‧ shaft

6‧‧‧ Shoulder

31‧‧‧First rotor left end ring

32‧‧‧First rotor right end ring

41‧‧‧Second rotor left end ring

42‧‧‧Second rotor right end ring

1 is a schematic cross-sectional view showing a structure of a rotor of a high-speed asynchronous motor according to an embodiment of the present invention.

Figure 2 is a schematic cross-sectional view of Figure 1A-A of the present invention.

In order to further illustrate the technical means and efficacy of the present invention for achieving the intended purpose of the invention, a high speed non-synchronous motor rotor structure and a motor including the rotor structure according to the present invention will be described below with reference to the accompanying drawings and preferred embodiments. The specific embodiment and its efficacy are described in detail later.

In the existing non-synchronous motor rotor, the rotor bar and the rotor end ring (where the rotor end ring corresponds to the second rotor end ring 4 in the present invention) are subjected to centrifugal force and are easily broken at high rotation speed, and the present invention A high speed non-synchronous motor rotor structure is proposed. As shown in FIGS. 1 and 2, the rotor structure includes: a rotor core 1, a rotor bar 2, a first rotor end ring 3, a second rotor end ring 4, and a rotating shaft 5, Wherein, the rotor core 1 is centrally provided with an axial through hole, the rotating shaft 5 is disposed in the axial through hole; the first rotor end ring 3 made of a high yield strength silicon steel sheet is closely attached to the rotor core 1, disposed at both ends of the rotor core 1, as an example, the first rotor end ring 3 is riveted to the rotor core 1; the second rotor end ring 4 is in close contact with the first rotor end ring 3, disposed at the first rotor end An end of the ring 3; the rotor bar 2 is disposed on an outer circumference of the rotor core 1, the first rotor end ring 3, and the second rotor end ring 4. The setting of the first rotor end ring 3 made of high yield strength silicon steel sheet greatly improves the anti-centrifugal capability of the non-synchronous motor rotor, improves the rotational speed of the non-synchronous motor, and ensures the mechanical strength of the non-synchronous motor under high-speed operation. Safety and reliability.

On the outer circumferences of the rotor core 1, the first rotor end ring 3, and the second rotor end ring 4, guide bars for mounting the rotor bars 2 are provided in the circumferential direction. As shown in Fig. 2 of the present invention, a plurality of bar holes are exemplarily provided in this example and correspondingly have a plurality of rotor bars 2. In the description herein, the guide bar holes penetrate the rotor core 1, the first rotor end ring 3 and the second rotor end ring 4, and are disposed at the rotor core 1, the first rotor end ring 3 and the second rotor end ring The outer circumference of 4, as such, after the rotor bars 2 are inserted into the guide bars, the rotor bars 2 are correspondingly located on the outer circumferences of the rotor core 1, the first rotor end ring 3 and the second rotor end ring 4. Specifically, in the outer circumferences of the rotor core 1, the first rotor end ring 3, and the second rotor end ring 4, a guide hole is provided along the circumferential direction, not to say that the guide hole is provided in the three When the outer side is such that the rotor bar 2 is inserted into the bar hole, the rotor core 1, the first rotor end ring 3 and the second rotor end ring 4 are wrapped therein, but: the bar hole is passed through the rotor core 1, first The rotor end ring 3 and the second rotor end ring 4 are in the interior of the three and close to the outside of the three (the outer side is relative to the side of the rotor core 1 located in the axial through hole), The bar holes are located on the outside of them. Preferably, the guide bar holes are evenly distributed on the outer circumferences of the rotor core 1, the first rotor end ring 3 and the second rotor end ring 4, and accordingly, a plurality of rotor bars 2 are along the rotor core 1, the first rotor end ring 3, and The outer circumference of the second rotor end ring 4 is evenly distributed.

In the example of the present invention, the rotating shaft 5 is combined with the rotor core 1 in an interference fit manner, and is disposed in the axial through hole. The interference is determined by specific fitting and stress calculation, and different products have different specifications. Value. The shaft 5 is provided with a convex shoulder 6 on one side in the axial direction, and the shoulder 6 is in contact with the first rotor left end ring 31 on the side corresponding to the shoulder 6.

The rotor core 1 is formed by laminating a plurality of high-conductivity silicon steel sheets, and the high-magnetic magnetic steel sheet is a conventional silicon steel sheet, such as a silicon steel sheet of M235-35. The yield strength of the conventional silicon steel sheet is 330MP-400MP, and the rotor The core 1 uses a plurality of high-conductivity silicon steel sheets to ensure the electromagnetic performance of the motor. The manufacturing process of the rotor core 1 is not limited thereto, and other methods of forming the silicon steel sheet into the desired rotor core 1 are suitable for this. The thickness of the high magnetic conductive silicon steel sheet is preferably 0.2 mm to 0.5 mm, and the number of required high magnetic conductive silicon steel sheets is determined according to the length of the rotor core along the axial direction of the rotor core and the thickness of the high magnetic conductive silicon steel sheet.

The first rotor end ring 3 includes a first rotor left end ring 31 and a first rotor right end ring 32. The first rotor left end ring 31 is disposed close to the rotor core 1 at the left end of the rotor core 1, and the first rotor right end ring 32 is closely attached. The rotor core 1 is disposed at the right end of the rotor core 1. The first rotor end ring 3 is formed by laminating a plurality of high yield strength silicon steel sheets, which improves the mechanical strength of the rotor structure, and the centrifugal structure of the rotor structure is increased, thereby improving the running speed of the motor. The manufacturing process of the first rotor end ring 3 is not limited thereto, and other methods of forming the silicon steel sheet into the desired first rotor end ring 3 are suitable for this. The thickness of the high yield strength silicon steel sheet is preferably 0.5 mm to 1 mm, and the number of required high yield strength silicon steel sheets is based on the length of the first rotor end ring along the axial direction of the rotor core and the thickness of the high yield strength steel sheet. It is determined that the length of the first rotor end ring 3 is preferably from 3 mm to 6 mm. A high yield strength niobium steel sheet is more easily obtained than a high yield strength stainless steel sheet having a thickness greater than 3 mm, and since the thickness of the first rotor end ring 3 is usually 3 mm or more, if it is made of a high yield strength stainless steel sheet material, stamping is performed. Difficult, the accuracy is difficult to guarantee, the die life is very short; and the high yield strength of the silicon steel sheet is thin, usually between 0.5~1mm, very easy to punch through the mold, easy to manufacture, greatly saving production costs.

The second rotor end ring 4 includes a second rotor left end ring 41 and a second rotor right end ring 42, the second rotor left end ring 41 abutting the first rotor left end ring 31 disposed at the left end of the first rotor left end ring 31 ( 1 is a reference), the second rotor right end ring 42 is disposed against the first rotor right end ring 32 at the right end of the first rotor right end ring 32 (referenced to FIG. 1).

Preferably, the rotor bar 2 and the second rotor end ring 4 are made of a high conductivity oxygen-free copper or copper alloy, and the rotor bar 2 and the second rotor end ring 4 are fixed. Together. Preferably, the rotor bar 2 and the second rotor end ring 4 may be fixed together by welding, and the materials used for the rotor bar 2 and the second rotor end ring 4 are not limited thereto. For example, the second rotor end ring 4 can be made of an aluminum material.

The present invention also provides a non-synchronous motor comprising the rotor structure, the rotor core 1 being made of a high-permeability silicon steel sheet, which ensures the electromagnetic performance of the motor. The first rotor end ring 3 at both ends of the rotor core 1 is made of a high-yield silicon steel sheet, which improves the mechanical strength of the rotor structure and makes the rotor structure resistant to centrifugal force, thereby increasing the running speed of the motor. The rotor core 1 is made of a high-permeability silicon steel sheet, and the first rotor end ring 3 at both ends of the rotor core 1 is made of a high-yield silicon steel sheet, and the combination of two different properties of the silicon steel sheet material realizes the electromagnetic of the motor together. The compatibility of performance and mechanical properties makes the motor increase the maximum speed of the motor under the premise of ensuring electromagnetic performance and mechanical performance. Among them, the silicon steel sheet is easy to obtain, and it is easy to realize stamping manufacturing through a mold, and the method is simple and the cost is low. The invention makes the non-synchronous motor greatly improve the mechanical strength of the rotor under the premise of ensuring electromagnetic performance, thereby improving the maximum rotational speed of the motor, and is more advantageous for realizing high speed and miniaturization of the motor design.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention. A person skilled in the art can make some modifications or modifications to equivalent embodiments by using the above-disclosed technical contents without departing from the technical scope of the present invention. It is still within the scope of the technical solution of the present invention to make any simple modifications, equivalent changes and modifications to the above embodiments.

Claims (10)

 A high speed non-synchronous motor rotor structure comprising: a rotor core (1) having an axial through hole at its center; a first rotor end ring (3) made of a high yield strength silicon steel sheet, which is in close contact with the rotor a core (1) disposed at both ends of the rotor core (1); a second rotor end ring (4) disposed adjacent to the end of the first rotor end ring (3); and a rotor bar (2) disposed at the center An outer circumference of the rotor core (1), the first rotor end ring (3), and the second rotor end ring (4); and a rotating shaft (5) disposed in the axial through hole.    The high speed non-synchronous motor rotor structure according to claim 1, characterized in that the rotating shaft (5) is combined with the rotor core (1) in an interference fit manner.    The high speed non-synchronous motor rotor structure according to claim 1, characterized in that the outer circumference of the rotor core (1), the first rotor end ring (3) and the second rotor end ring (4) are circumferentially arranged The guide bar holes of the rotor bar (2) are mounted, and the rotor bars (2) are inserted into the bar holes.    The high speed non-synchronous motor rotor structure according to claim 3, characterized in that the guide bar hole is along the rotor core (1), the first rotor end ring (3) and the second rotor end ring (4) The circumferential direction is evenly distributed.    The high-speed non-synchronous motor rotor structure according to any one of claims 1 to 4, wherein the rotor core (1) is formed by laminating a plurality of high-conductivity silicon steel sheets, and the first The rotor end ring (3) is formed by laminating a plurality of high yield strength silicon steel sheets.    The high speed non-synchronous motor rotor structure according to claim 5, characterized in that the high-conductivity silicon steel sheet has a yield strength ranging from 330 MP to 400 MP, and the high yield strength silicon steel sheet has a yield strength higher than 600 MP.    The high speed non-synchronous motor rotor structure according to claim 5, wherein the high magnetic conductive silicon steel sheet has a thickness of 0.2 mm to 0.5 mm, and the high yield strength silicon steel sheet has a thickness of 0.5 mm to 1 mm.    The high speed non-synchronous motor rotor structure according to any one of claims 1 to 4, characterized in that the rotor bar (2) and the second rotor end ring (4) are made of oxygen-free copper or copper alloy. production.    The high speed non-synchronous motor rotor structure according to claim 8, characterized in that the rotor bar (2) and the second rotor end ring (4) are fixed together.    A non-synchronous electric machine characterized by comprising the rotor structure as claimed in claims 1-9.