CN105024468A - Axial-flux motor core device with water cooling structure - Google Patents

Abstract

The invention discloses an axial magnetic flux motor iron core device with a water cooling structure. The device includes a segmented stator iron core, an iron core fixing block, an S-shaped spring piece, a cooling water pipe pressure plate, and a cooling water pipe; the front end of the iron core There is a groove on the top of the groove, and one side of the groove opening is engaged with the fixed block of the iron core; the cooling water pipe runs through the groove and fits closely with the other side of the groove; one side of the pressure plate of the cooling water pipe is connected to the outer wall of the cooling water pipe Close fit, the other side is a plane, which is in contact with the S-shaped spring piece; the S-shaped spring piece is fixed between the cooling water pipe pressure plate and the iron core fixing block, and is normally in a compressed state, and the spring force compresses the cooling water pipe pressure plate. According to the present invention, the problems of difficult cooling, complex structure, difficult processing and high cost of the stator core of the current axial flux motor are solved. At the same time, the structure has good installation expansion performance and can meet the installation requirements of high-power axial flux motors. and cooling requirements.

Description

A core device of an axial flux motor with a water-cooled structure

technical field

The invention belongs to the field of axial flux motors, and more specifically relates to an axial flux motor iron core device with a water cooling structure.

Background technique

The existing axial flux motor iron core is processed by "punching" and "rolling" methods, using servo equipment to control the groove pitch, punching grooves on silicon steel sheets, and then rolling them into a disc structure. For example, the patent document whose patent application number is CN200810041184.0 discloses a manufacturing method for the stator core of a disc motor. On the tape release reel, the tape reel will send the electrical steel coil to the feeding table at regular intervals, and the electrical steel coil will be sent into the stamping die by the feeding table to punch out the groove shape, and the electrical steel coil tape after the groove shape is rewound The coil is wound into an iron core disc. The above processing method is to punch a single groove on the single-layer tape, and then wind it up. The processing speed is relatively slow, and the processed surface after winding is poor in smoothness and has many burrs. The patent document with the patent application number CN200920117995.4 discloses a large-diameter disc motor iron core automatic processing equipment, including a feeding mechanism, a punching mechanism and a winding mechanism. The feeding mechanism firstly levels the silicon steel strip, and then Using a high-precision servo system to synchronize the punching and winding process can greatly reduce winding errors. However, the punching and rolling equipment involved in the above has a complex structure, slow processing speed, and when the diameter of the axial magnetic flux core increases, different winding tooling needs to be processed. If the diameter is more than 2 meters, the feeding mechanism and The precision of the winding mechanism is difficult to control, and the smoothness of the processing plane is poor, which is not conducive to the integration of cooling pipes, thus hindering the promotion of axial flux motors.

Contents of the invention

Aiming at the defects of the prior art, in order to solve the cooling problem of the existing axial flux core and facilitate the installation of the centralized winding, this patent proposes an axial flux motor core device with a water cooling structure.

The iron core device includes an iron core fixing block, an S-shaped spring piece, a cooling water pipe pressure plate, a cooling water pipe and an iron core. Snap connection; the cooling water pipe runs through the groove and fits closely with the other side of the groove; one side of the cooling water pipe pressure plate closely fits the outer wall of the cooling water pipe, and the other side is a plane, Contact with the S-shaped spring piece; the S-shaped spring piece is fixed between the cooling water pipe pressure plate and the iron core fixing block, and is normally in a compressed state, and the spring force compresses and fixes the cooling water pipe pressure plate;

The iron core is composed of a plurality of axial stator laminations stacked, and the stator laminations have through holes for superposition and fixing of the stator laminations; the stator laminations also have another through hole, and the through hole on the laminations After the holes are superimposed, they form the grooves of the iron core device;

The iron core device also includes an inner insulating end cap on the upper side of the iron core device and an outer insulating end cap on the lower side, for the integrated installation of the iron core device;

The stator laminations also have positioning holes for fixing and positioning the inner insulating end cover and the outer insulating end cover;

Further, the groove is a dovetail type, and the iron core fixing device is a dovetail tenon;

Further, the cooling water pipe is made of copper pipe, and one end of the cooling water pipe pressure plate has an arc-shaped notch with the same radius as the copper pipe, and the cooling water pipe is in contact with the arc surface;

Further, the S-shaped spring piece is made of spring steel;

Further, the inner and outer insulating end caps are made of insulating and non-magnetic materials, and the side in contact with the iron core device is a plane, and the other side is an arc surface;

Further, the plane side is designed with a positioning boss for positioning during installation.

All in all, the water-cooled overall structural design of the axial flux motor iron core adopted in the present invention has the advantages of simplicity and reliability, easy processing, low manufacturing cost and good cooling effect, and solves the current difficulty in cooling the stator core of the axial flux motor. Complexity, difficult processing, high cost, etc., and the structure has good installation and expansion performance, and can meet the installation and cooling requirements of high-power axial flux motors.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the axial flux motor iron core with water-cooling structure according to the present invention;

Fig. 2 is a structural schematic diagram of the iron core stator lamination;

Figure 3 is a schematic diagram of the overall structure of the iron core;

Fig. 4a is a structural schematic diagram of an iron core fixing device with threaded holes;

Fig. 4b is a schematic structural view of an iron core fixing device without threaded holes;

Figure 5a is a schematic structural view of the cooling water pipe;

Fig. 5b is a structural schematic diagram of the cooling water pipe pressing plate;

Fig. 6 is a structural schematic diagram of an S-shaped spring leaf;

Figure 7a is a schematic structural view of the inner and outer insulating end caps;

Fig. 7b is a schematic structural diagram of the inner and outer insulating end caps.

in:

1—core fixing block; 2—S-shaped spring piece; 3—cooling water pipe pressure plate; 4—cooling water pipe; 5—inner insulating end cover; 6—iron core; 7—external insulating end cover; 8, 10—through hole ; 9—positioning hole; 11—notch; 12—positioning boss; 13—groove

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

FIG. 1 is a schematic diagram of the general structure of the core of an axial flux motor with a water-cooled structure according to the present invention. As shown in Figure 1, the iron core includes an iron core fixing block 1, an S-shaped spring piece 2, a cooling water pipe pressure plate 3, a cooling water pipe 4, an inner insulating end cover 5, an iron core 6 and an outer insulating end cover 7, and the iron core 6 There is a groove 13 of a specific shape, one side of the groove 13 is designed as a dovetail, and is connected with the dovetail-shaped iron core fixing block 1; the other side is designed as an arc, and the cooling water pipe 4 runs through the arc side of the groove. It fits closely with the iron core 6. One end of the cooling water pipe pressure plate 3 is designed as an arc-shaped contact surface, which is closely attached to the outer wall of the cooling water pipe 4 , and the other end surface is designed as a plane, which is in contact with the S-shaped spring 2 . The S-shaped spring 2 is fixed between the cooling water pipe pressure plate 3 and the iron core fixing block 1, and is normally in a compressed state. The spring force compresses the cooling water pipe pressure plate, increases the pressure between the cooling water pipe, the pressure plate and the iron core, and uses friction to fix the cooling. The water pipe prevents the movement of the cooling water pipe during operation and reduces vibration and noise.

The structural composition of the iron core and stator laminations is shown in Figure 2. The iron core is composed of axial laminations, and each lamination has corresponding holes and slots. The stator laminations are shown in Figure 2. Their functions are as follows: Hole 8 and through hole 10 can be used to fasten the silicon steel sheet with bolts; positioning hole 9 is used for positioning the inner insulating end cover and outer insulating end cover; the notch 11 is used to form the groove 13 of the iron core device after stacking to place the cooling water pipe 4 and fixed iron core fixing block 1.

Since the iron cores are distributed along the circumference of the surface of the stator fixed disk, the shape of the iron cores should also be distributed radially, as shown in Figure 3, so that the size of each silicon steel sheet formed at the end is different. This patent adopts two processing methods To manufacture such an iron core: the first method is to make the silicon steel sheets the same size, and after stacking the iron core, milling is carried out on the whole, so that the whole iron core is formed for the last time; the second method is to make the silicon steel sheet different in size According to the actual molding size, calculate the size of the silicon steel sheet at the corresponding radius position, process the silicon steel sheet as a standard, and finally stack the silicon steel sheets of different sizes into an iron core according to the corresponding rules, and the iron core can also use composite soft magnetic material (SMC) suppressed.

The iron core fixing device is a dovetail tenon, which can have two structural forms according to the fixing method: the first one is a tenon with threaded holes, and the iron core fixing device and the stator fixing plate are fixed by bolts, as shown in Figure 4(a) ; The second type is a tenon without threaded holes, and the iron core fixing device and the stator fixing plate are welded and fixed, as shown in Figure 4 (b). When using a tenon with a threaded hole, the iron core assembly is fixed to the casing by screws; when using a tenon without a threaded hole, the tenon is welded on the casing or processed when the casing is cast.

The material of the cooling water pipe is made of copper pipe, as shown in Figure 5(a), copper has good ductility and is easy to process, and copper has excellent thermal conductivity and good cooling effect. The cooling water pipe pressure plate has an arc-shaped notch with the same radius as the copper pipe at one end, as shown in Figure 5 (b), it can be in contact with the cooling water pipe with a circular arc surface, the contact area is large, and a certain pressure is applied, and the contact can be used. The friction between the surfaces is used to fix the water pipe, prevent the water pipe from moving up and down along the axis of the water pipe, and prevent the vibration and noise of the water pipe.

S-shaped spring sheet 2 is made of spring steel, which has good toughness, and a thin steel sheet is used to make an S-shaped (also called wave-shaped) spring sheet, as shown in Figure 6. The S-shaped spring sheet, by applying a certain extrusion force to the S surface, the spring sheet produces elastic deformation, thus generating an elastic return force, which can be used to fasten mechanical parts.

The inner and outer insulating end caps 5 and 7 are made of insulating and non-magnetic materials, and the flat side is designed with a positioning boss 12, which is used for positioning during installation, which can make the installation easier and more accurate. The other side is designed as an arc, It can make the coil transition smoothly during this winding, and reduce the bending stress. The design of the inner and outer insulating end caps is the same, but the size is different. Figure 7(a)(b) shows the inner insulating block. The inner insulating end cap is placed on the small end face of the iron core, the outer insulating end cap is placed on the large end face of the iron core, and finally wound into a whole by winding. The inner and outer end insulating covers can also be replaced by materials of other shapes.

Those skilled in the art can easily understand that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention, All should be included within the protection scope of the present invention.

Claims (8)

1. An axial flux motor iron core device with a water-cooled structure is characterized in that: the iron core device comprises an iron core fixing block (1), an S-shaped spring leaf (2), a cooling water pipe pressing plate (3), a cooling The water pipe (4) and the iron core (6), the front end of the iron core (6) has a groove (13), and the opening side of the groove (13) is engaged with the iron core fixing block (1) connection; the cooling water pipe (4) runs through the groove (13) and fits closely with the other side of the groove (13); one side of the cooling water pipe pressure plate (3) is connected to the cooling water pipe ( 4) The outer wall is closely attached, and the other side is a plane, which is in contact with the S-shaped spring piece (2); the S-shaped spring piece (2) is fixed on the cooling water pipe pressure plate (3) and the iron core Between the blocks (1), the normal state is in a compressed state, and the spring force compresses the cooling water pipe pressure plate (3) so as to fix the cooling water pipe (4). 2. The axial flux motor iron core device with water cooling structure according to claim 1, characterized in that, the iron core (6) is composed of a plurality of axial stator laminations stacked, and each stator lamination has a pass through The holes (8), (10) are used for superposition and fixing of the stator laminations; the stator laminations also have notches (11), and the notches (11) on the laminations are superimposed to form the grooves (13) . 3. The axial flux motor iron core device with water cooling structure as claimed in claim 2, characterized in that, the iron core device also includes an inner insulating end cover (5) and a lower The outer insulating end cap (7) on the side is used for the integrated installation of the core device. 4. The axial flux motor iron core device with water cooling structure as claimed in claim 3, characterized in that, each stator lamination also has a positioning hole (9) for the inner insulating end cover (5) and Fixed positioning of the outer insulating end cap (7). 5. The axial flux motor iron core device with water-cooling structure according to any one of claims 1-4, characterized in that, one end surface of the cooling water pipe pressing plate (3) is provided with a cooling water pipe (4) ) arc-shaped notch with the same radius, and the cooling water pipe is in close contact with the arc surface. 6. The axial flux motor iron core device with water cooling structure as described in any one of claims 1-4, is characterized in that, described notch (13) is dovetail type, and described iron core fixed block ( 1) It is a dovetail tenon. 7. The core device of an axial flux motor with a water-cooled structure according to any one of claims 1-4, wherein the S-shaped spring piece is made of spring steel. 8. The core device of an axial flux motor with a water-cooled structure as claimed in claim 3 or 4, characterized in that the inner and outer insulating end covers (5) (7) are made of insulating and non-magnetic materials , one side in contact with the iron core device is a plane, and the other side is an arc surface.