CN202798367U

CN202798367U - Motor closed-slot rotor core die-casting structure

Info

Publication number: CN202798367U
Application number: CN 201220243227
Authority: CN
Inventors: 王岳; 周小东; 马艳萍
Original assignee: Jiangsu Tongda Power Technology Co Ltd
Current assignee: Nantong Tongda Silicon Steel Stamping Technology Co Ltd
Priority date: 2012-05-25
Filing date: 2012-05-25
Publication date: 2013-03-13
Anticipated expiration: 2022-05-25

Abstract

The utility model relates to the field of motor manufacturing, and specifically relates to the manufacturing of closed-slot die-casting aluminium rotors of large motors. According to the motor closed-slot rotor core die-casting structure, a motor rotor is processed into an open-slot type or a closed-slot type after turning, and an open-slot punching sheet can be firstly processed into the closed-slot type and the rotor is processed into the open-slot type after air gap turning; and a rotor iron core lamination stack is formed by laminating closed-slot rotor punching sheets with an open-slot punching sheet added at every height of 30 to 50 mm, and is made into a cast aluminium rotor by die casting. According to the iron core lamination structure, the open-slot punching sheets are added by segments. The iron core lamination structure prevents the quality hidden dangers of broken bars and thin bars in die casting of long closed-slot rotors, improving the rotor cast aluminium filling rate by 1-3%.

Description

A kind of motor closed slot rotor core die casting structure

Technical field

The utility model relates to field of motor manufacturing, the manufacturing of especially larger motor closed slot die casting aluminium rotor.

Background technology

The rotor of existing domestic middle-size and small-size low voltage motor all adopts open slot technique, die casting generally all is provided with middle mould, mould is because the heat expansion factor, the gap is wayward, cause open slot rotor alclad serious, it has a strong impact on outward appearance and quality, increase the difficulty of rotor Vehicle Processing air gap, also may impact intermediate frequency heating collar axle technique, thereby most of rotor is designed to the flute profile of remaining silent, such as Fig. 1, Fig. 2 and shown in Figure 3, the rotor of some larger extrusion process also adopt the closed slot design, but the closed slot rotor is in press casting procedure, because the die casting speed, top bed die iron core plane and patrix fan blade or the exhaust of balance columns part have a large amount of air and have little time to discharge and be wrapped in rotor aluminum strip and the aluminium ring, cause larger pore, cause rotor bar inside to have slice, the serious hidden danger of quality such as disconnected bar.

Motor rotor die-casting aluminium liquid flow analysis

To flow be comparatively to mix complicated process to aluminium liquid during die casting; Domestic motor rotor die-casting generally all adopts vertical aluminium casting machine, the rotor fan blade advances aluminium, the die casting time only has 0.3 ~ 0.5 second, general rotor fan blade quantity does not wait to tens from several, and the rotor number is more, during die casting, type groove aluminium liquid over against fan blade is directly injected to upper cavity, part aluminium liquid returns from the type groove on upper impression next door, converge with the aluminium liquid that comes from the lower impressions bypass, so the flow direction of injection process aluminium liquid is very disorderly.

The extrusion process exhaust gas analysis

Cavity structure is analyzed: rotor die casting is non-to be same as the pure die cavity die casting of general structural member, the die cavity die casting that it is comprised of rotor core inserts and rotor upper and lower mould, middle continuous by thin and long a plurality of type grooves, because rotor aluminium ring and the type groove size design of the different numbers of poles of different model are widely different, the volume of die cavity is also widely different, particularly 2 utmost point motor aluminum ring sectional areas are all larger, and the air in the die cavity is also more, and can discharge smoothly be the key of internal rotor quality assurance in die casting moment.

The utility model content

The utility model provides a kind of closed slot motor rotor die-casting technique for the deficiency of above technology.This technique has overcome when the die casting speed, the phenomenon of upper/lower die iron core plane and patrix fan blade or balance columns exhaust deficiency.

A kind of motor closed slot rotor core die casting structure, grooved opening or the two kinds of forms of remaining silent after the described rotor Vehicle Processing, the open slot rotor punching is opening after also can being processed as first the grooved of remaining silent, rotor airgap Vehicle Processing, described rotor core laminations highly adds the described open slot rotor punching of a slice by above-mentioned closed slot rotor punching every 30 ~ 50mm and is overrided to form, and becomes cast-aluminum rotor through die casting again.

Grooved at described closed slot rotor punching is washed mouth open, described A/F is 1 ~ 1.5mm, the punching that grooved is washed open behind the mouth is described open slot rotor punching, rotor core after laminating has a plurality of deflation areas in the rotor length direction, just formed the air discharge duct with the identical 1 ~ 1.5mm*0.5mm of described grooved quantity cross section on each deflation area, wherein 0.5mm is the thickness of punching.

The utility model iron core laminated structure, segmentation increases opening sheet.This kind iron core laminated structure has solved the hidden danger of quality of the disconnected bar of longer closed slot motor rotor die-casting, slice, improves casting aluminum rotor filling rate 1 ~ 3%.

Description of drawings

Fig. 1 is existing closed slot rotor iron core laminated structure schematic diagram;

Fig. 2 is existing closed slot rotor punching structure front view;

Fig. 3 is Fig. 2 partial enlarged drawing;

Fig. 4 is the utility model the second punching front view;

Fig. 5 is the local enlarged diagram of Fig. 4;

Fig. 6 is a kind of closed slot rotor iron core laminated structure of the utility model schematic diagram;

Fig. 7 is the local enlarged diagram of Fig. 6;

Wherein 1, closed slot rotor punching; 2, open slot rotor punching; 3, grooved; 4, opening.

Embodiment

The closed slot rotor is in press casting procedure, because die casting speed, top bed die iron core plane and patrix fan blade or the exhaust of balance columns part, having a large amount of air has little time to discharge and is wrapped in rotor aluminum strip and the aluminium ring, cause larger pore, slice, disconnected bar, cause rotor to have hidden danger of quality, we are interrupted the die casting checking that adds the opening blade technolgy to the closed slot rotor, the rotor filling rate increases by 1 ~ 3%, maximum motor die casting is to H450-4, external diameter ∮ 560, length 1080, clean aluminium consumption 127kg, generally the closed slot rotor more than the 250mm length is used, the more long-acting fruit of rotor core length is more obvious.

We adopt the opening that closed slot rotor punching grooved top is washed into 1 ~ 1.5mm, press from both sides the punching of a described grooved top end opening during lamination every 30 ~ 50mm, being equivalent to has increased a plurality of deflation areas in the rotor length direction, just formed the air discharge duct in the cross section of identical 1 ~ 1.5mm*0.5mm with flute profile quantity on each deflation area, wherein 0.5mm is the thickness of punching.

To sum up segmentation increases opening sheet technique, air during die casting in mold cavity and the flute profile can be by simultaneously exhaust of a lot of air discharge ducts on the original air discharge duct of mould and the above-mentioned iron core, the air of discharging on the iron core is by middle mould air gap and the outside exhaust of die joint, rotor is in press casting procedure like this, the air capacity that is wrapped in aluminum strip and the aluminium ring significantly reduces, improved the internal soundness of casting aluminum rotor, and can not form alclad on the rotor outer circle, can not have any impact to follow-up sleeve and cylindrical Vehicle Processing.

Claims

1. motor closed slot rotor core die casting structure, grooved after the described rotor Vehicle Processing has open slot rotor punching or two kinds of structures of closed slot rotor punching, the open slot rotor punching is processed as first the closed slot rotor punching, Vehicle Processing is the open slot rotor punching to described closed slot rotor punching through rotor airgap, it is characterized in that: rotor core laminations highly adds the described open slot rotor punching of a slice by above-mentioned closed slot rotor punching every 30 ~ 50mm and is overrided to form, and becomes cast-aluminum rotor through die casting again.

2. a kind of motor closed slot rotor core die casting structure according to claim 1, it is characterized in that: in the punching of the grooved place of described closed slot rotor punching opening is arranged, described A/F is 1 ~ 1.5mm, the punching that the closed slot rotor punching is washed open behind the mouth is described open slot rotor punching, rotor core after laminating has a plurality of deflation areas in the rotor length direction, just formed the air discharge duct with the identical 1 ~ 1.5mm*0.5mm of described grooved quantity cross section on each deflation area, wherein 0.5mm is the thickness of punching.