Induction motor and induction motor cast-aluminum rotor

Abstract

The utility model provides an induction motor and an induction motor cast-aluminum rotor, and the rotor comprises a punching sheet lamination which is provided with a plurality of rotor grooves which are distributed in the circumferential direction, a first end plate and a second end plate which are respectively disposed on the front and rear end faces of the punching sheet lamination, and a ventilation assembly which is disposed on the end face of a ventilation duct of a lamination segment of the punching sheet lamination. And the copper sleeves are inserted into the rotor slots in a one-to-one correspondence manner. The motor is simple in structure and convenient to assemble, the technical problem of aluminum leakage is solved, meanwhile, the area of a ventilation and heat dissipation channel is increased, flow resistance is reduced, the heat dissipation performance of the motor is obviously improved, and the production cost is reduced. The induction motor with the induction motor cast-aluminum rotor is stable and reliable in performance, the maintenance cost is reduced, and the service life of the induction motor is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of motor equipment, and more specifically, to an induction motor cast aluminum rotor. The present application also relates to an induction motor comprising the above-mentioned induction motor cast aluminum rotor. Background Art

[0002] At present, asynchronous motors dominate the industrial market, among which induction rotor motors are the mainstream. The rotor structure is divided into cast aluminum, cast copper, copper bar embedded, and aluminum bar embedded. Among them, cast aluminum rotors are the most widely used.

[0003] In terms of casting rotors, there are structures with and without axial ventilation ducts. For rotor structures with axial ventilation ducts, centrifugal aluminum casting is usually used, but there are many disadvantages in the implementation process: for example, due to the existence of ventilation ducts, the risk of aluminum leakage is greatly increased; there are problems such as the need to open new molds or the complex structure of ventilation slots at the location of the ventilation plate, which increases the initial investment cost and processing cost of tooling molds; in order to achieve the normal circulation of aluminum liquid, the area of ​​the original radial ventilation duct is occupied, causing the rotor and even the entire motor to have a high temperature rise. Utility Model Content

[0004] The present application provides an aluminum cast rotor for an induction motor, which solves the technical problem of aluminum leakage and reduces processing costs and mold investment costs.

[0005] The present application also provides an induction motor including the above-mentioned induction motor cast aluminum rotor, which significantly improves the overall performance of the induction motor.

[0006] The present application provides a cast aluminum rotor for an induction motor, comprising: a punching lamination stack with a plurality of rotor slots distributed circumferentially, a first end plate and a second end plate respectively arranged on the front and rear end surfaces of the punching lamination stack, a ventilation assembly arranged on the end surfaces of the ventilation ducts of the stacked segments of the punching lamination stack, and a copper sleeve for being inserted into each of the rotor slots in a one-to-one correspondence.

[0007] In some embodiments, the copper sleeve is oval, waist-shaped, rectangular, pear-shaped or trapezoidal.

[0008] In some embodiments, the front and rear ends of the copper sleeve are each provided with a circle of flange.

[0009] In some embodiments, the length of the flange is less than or equal to half the length of the aluminum end ring.

[0010] In some embodiments, the front and rear ends of the copper sleeve are each provided with a plurality of circumferentially distributed liquid inlets.

[0011] In some embodiments, the ventilation assembly includes a plurality of outer ring ventilation components distributed in the outer ring and a plurality of inner ring ventilation components arranged in the inner ring of all the outer ring ventilation components.

[0012] In some embodiments, the ventilation component is specifically a ventilation channel steel.

[0013] The cast aluminum rotor of the induction motor provided in this application has the following technical advantages:

[0014] 1. By inserting copper sleeves into each rotor slot of the punching lamination, the heat dissipation area of ​​each section of the ventilation duct is increased, the area of ​​the rotor ventilation duct is reduced, and a good channel for heat dissipation of the entire rotor is provided;

[0015] 2. The copper sleeve is inserted into the inner wall of the rotor slot. According to the characteristics of the skin effect in the motor design, it can reduce part of the heat loss of the rotor and improve the heat dissipation performance;

[0016] 3. The integrated copper sleeve can reduce the risk of aluminum leakage during aluminum casting;

[0017] 4. Reduce the development investment cost and processing cost of molds.

[0018] The utility model also provides an induction motor, comprising a rotor, wherein the rotor is specifically the cast aluminum rotor of the induction motor described in any one of the above items.

[0019] Due to the induction motor cast aluminum rotor, the induction motor has stable performance, prolonged service life and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the three-dimensional structure of the cast aluminum rotor of the induction motor provided in this application;

[0022] Figure 2 A cross-sectional view of the cast aluminum rotor of the induction motor provided in the present application;

[0023] Figure 3 for Figure 2 Cross-sectional view of the middle AA part;

[0024] Figure 4 An exploded view of the cast aluminum rotor of the induction motor provided for the present application (the aluminum terminals are not shown);

[0025] Figure 5 A schematic diagram of a cast aluminum rotor structure obtained by pouring aluminum liquid and forming in this application;

[0026] Among them, 1-first end plate, 2-punch lamination, 3-second end plate, 4-ventilation assembly, 5-copper sleeve, 6-aluminum end ring;

[0027] 21- rotor slot, 41- outer ring ventilation component, 42- inner ring ventilation component. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] refer to Figures 1 to 4 , Figure 1 A schematic diagram of the three-dimensional structure of the cast aluminum rotor of the induction motor provided in this application; Figure 2 A cross-sectional view of the cast aluminum rotor of the induction motor provided in the present application;

[0030] Figure 3 for Figure 2 Cross-sectional view of the middle AA part; Figure 4 An exploded view of the cast aluminum rotor of the induction motor provided for this application.

[0031] The present application provides a cast aluminum rotor of an induction motor, which mainly includes a punching lamination 2, a first end plate 1 and a second end plate 3, a ventilation assembly 4 and a plurality of copper sleeves 5. The punching lamination 2 is formed by overlapping a plurality of punching laminations, and a plurality of rotor slots 21 distributed circumferentially are arranged on the end face of each punching lamination. The first end plate 1 is mounted on the front end face of the punching lamination 2, and the second end plate 3 is mounted on the rear end face of the punching lamination 2. The first end plate 1 is specifically a DE end plate (driving end plate), and the second end plate 3 is specifically an NDE end plate (non-driving end plate). The ventilation assembly 4 is arranged in the ventilation passage of the stacked segments of the punching lamination 2, and is mounted on a de-coated punching lamination of the punching lamination 2. Preferably, the ventilation assembly 4 is welded and connected to the de-coated surface of the punching lamination.

[0032] The shape and length of the copper sleeve 5 are determined according to the size of the rotor slot 21 of the punching sheet stack 2. After the punching sheet stack 2 is assembled with the first end plate 1 and the second end plate 3, each copper sleeve 5 is correspondingly inserted into each rotor slot 21 of the punching sheet stack 2. When casting aluminum, the aluminum liquid is poured into the copper sleeve 5 to form a cast aluminum rotor.

[0033] The steps for assembling the cast aluminum rotor of the induction motor provided by the present application are as follows:

[0034] Step 1: Arrange the ventilation assembly 4 in the overlapping segmented ventilation ducts according to the actual number of ventilation ducts of the rotor;

[0035] Step 2: Assemble the first end plate 1, the punching sheet stack 2 and the second end plate 3 into one piece by using a tool to maintain pressure;

[0036] Step 3: insert the copper sleeve 5 into each rotor slot 21;

[0037] Step 4: Install the above-assembled overall structure with the aluminum casting mold, heat it and pour aluminum liquid to form Figure 5 The induction motor shown has a cast aluminum rotor.

[0038] The present application forms a new cast aluminum rotor structure by embedding a copper sleeve 5 that matches the slot type of the rotor slot 21 in the rotor core, inserting the copper sleeve 5 into the rotor slot 21 before casting aluminum, and then pouring aluminum liquid, which can ensure that aluminum does not leak, and at the same time reduce the mold development of the punching structure, saving the mold investment cost. In addition, the ventilation and heat dissipation area is increased, the flow resistance is reduced, and the heat dissipation capacity of the motor is significantly improved. The motor power can be increased under the same specifications, achieving the technical effect of reducing costs. In addition, in terms of electrical performance, since the surface of the rotor guide bar contacts the copper sleeve 5, according to the skin effect principle, under the power supply of a pulse power supply with good power quality, the current heat loss caused by the rotor harmonic current in the area adjacent to the slot will be significantly reduced. In addition to the above-mentioned heat loss, the loss caused by the rotor harmonic current in the upper cage guide bar with very small resistance will also be reduced, thereby improving the overall efficiency of the motor with the same specifications.

[0039] The copper sleeve 5 in the present application is preferably, but not limited to, pear-shaped, oval, waist-shaped, rectangular, or trapezoidal. The pear-shaped refers to Figure 3 The arc-shaped structure shown in FIG.

[0040] Furthermore, a flange is provided at each of the front and rear ends of the copper sleeve 5, and the outer edge diameter of the flange is larger than the outer diameter of the copper sleeve 5. This arrangement can reduce the gap between the aluminum end ring 6, especially at the high temperature of aluminum liquid casting, the aluminum end ring 6 and the copper sleeve 5 have different materials and thermal expansion occurs. Combined with the flange structure of the front and rear end surfaces of the copper sleeve 5, it can ensure that the aluminum liquid completely enters the copper sleeve 5, effectively preventing aluminum liquid leakage, thereby ensuring aluminum liquid casting efficiency. In order to ensure assembly reliability, the length of the flange should be less than or equal to half the length of the aluminum end ring 6.

[0041] In order to further improve the casting efficiency, several circumferentially distributed liquid inlets can be respectively opened at the front and rear ends of the copper sleeve 5. On the basis of feeding the material through the feed inlet in the middle of the copper sleeve 5, multiple circumferential small flow liquid inlets are supported to meet various liquid inlet structures and improve the casting efficiency. In addition, when pouring aluminum liquid, high-temperature aluminum liquid enters through multiple liquid inlets at the end of the copper sleeve 5, and can be circumferentially coated on the end face of the copper sleeve 5, reducing the temperature difference between the copper sleeve 5 and the aluminum end ring 6, thereby improving the casting efficiency.

[0042] It should be noted that the copper sleeve 5 in the present application is not limited to an integrated sleeve, but can also be obtained by multi-layer winding of thin copper plates and processing with expansion tools.

[0043] The above-mentioned ventilation assembly 4 includes a plurality of outer ring ventilation components 41 and a plurality of inner ring ventilation components 42. The outer ring ventilation components 41 and the inner ring ventilation components 42 are distributed circumferentially. The inner ring ventilation components 42 are arranged on the inner ring of the outer ring ventilation components 41. The ventilation components arranged in the inner and outer rings can increase the heat dissipation area and improve the heat dissipation performance of the rotor and the entire machine.

[0044] The outer ring ventilation component 41 and the inner ring ventilation component 42 are preferably but not limited to ventilation channel steels. Since channel steels are widely available and have their own guide groove structure, costs can be reduced.

[0045] The cast aluminum rotor of the induction motor provided in the present application can avoid leakage of aluminum liquid and prevent the risk of aluminum leakage in the rotor cast aluminum, while increasing the area of ​​the rotor radial ventilation duct, improving the efficiency of the motor rotor and reducing production costs.

[0046] In addition, the present application also provides an induction motor including an induction motor cast aluminum rotor, which significantly improves the overall performance of the induction motor, has stable and reliable performance, reduces maintenance costs, and extends the service life of the induction motor.

[0047] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0048] The induction motor and the cast aluminum rotor of the induction motor provided by the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. An induction motor cast aluminum rotor, characterized in that: include: A punched sheet stack (2) having a plurality of rotor slots (21) distributed in the circumferential direction is provided, a first end plate (1) and a second end plate (3) are respectively arranged on the front and rear end surfaces of the punched sheet stack (2), a ventilation assembly (4) is arranged on the end surface of the ventilation duct of the stacked segments of the punched sheet stack (2), and a copper sleeve (5) is inserted into each of the rotor slots (21) in a one-to-one correspondence.

2. The cast aluminum rotor of the induction motor according to claim 1, characterized in that: The copper sleeve (5) is oval, waist-shaped, rectangular, pear-shaped or trapezoidal.

3. The cast aluminum rotor of the induction motor according to claim 1, characterized in that: The front and rear ends of the copper sleeve (5) are each provided with a circle of flanges.

4. The cast aluminum rotor of the induction motor according to claim 3, characterized in that: The length of the flange is less than or equal to half the length of the aluminum end ring (6).

5. The cast aluminum rotor of the induction motor according to claim 1, characterized in that: The front and rear ends of the copper sleeve (5) are each provided with a plurality of liquid inlets distributed in the circumferential direction.

6. The cast aluminum rotor of an induction motor according to any one of claims 1 to 5, characterized in that: The ventilation assembly (4) comprises a plurality of outer ring ventilation components (41) distributed in the outer ring and a plurality of inner ring ventilation components (42) arranged in the inner ring of all the outer ring ventilation components (41).

7. The cast aluminum rotor of the induction motor according to claim 6, characterized in that: The outer ring ventilation component (41) and the inner ring ventilation component (42) are specifically ventilation channel steels.

8. An induction motor comprising a rotor, characterized in that: The rotor is specifically the cast aluminum rotor of the induction motor as described in any one of claims 1 to 7.

Images