CN204304645U - The DC brushless motor of a kind of p-m rotor and application thereof - Google Patents

Abstract

The utility model discloses a permanent magnet rotor, which comprises an inner rotor iron core, a plurality of outer rotor iron cores and permanent magnets, a shaft hole is opened in the middle of the inner rotor iron core, a connecting part and a plastic sealing body are also included, and the connecting part is set in the On the outside of the inner rotor core, there are several card slots on the outer peripheral edge of the connecting part in the circumferential direction, and a block is arranged on the inner end of the outer rotor core, and several outer rotor cores are installed on the outer peripheral edge of the connecting part in the circumferential direction. , the block is nested in the slot, and the installation slot is formed between two adjacent outer rotor cores, the permanent magnet is nested in the installation slot, and the plastic package combines the inner rotor core, connecting parts, several outer rotor cores and The permanent magnets are connected into one body, the structure is simple, the structure is strong, the work is reliable, and the phenomenon of magnetic flux leakage of the rotor can be greatly reduced, and the performance of the rotor can be improved.

Description

A permanent magnet rotor and its applied DC brushless motor

Technical field:

The utility model relates to a permanent magnet rotor and a DC brushless motor applied thereto.

Background technique:

The inner rotor iron core of the existing permanent magnet rotor is installed on the rotating shaft by injection molding, and several outer rotor iron cores are installed on the outer peripheral edge of the inner rotor iron core at intervals, and a mounting groove is formed between two adjacent outer rotor iron cores. The permanent magnets are nested and installed in the installation groove, but the structural strength of this permanent magnet rotor is low, it is easy to loosen during the high-speed operation of the motor, and the reliability is low. At the same time, the permanent magnet rotor has magnetic flux leakage, which makes the permanent magnet rotor operating efficiency is reduced.

Invention content:

The purpose of this utility model is to provide a permanent magnet rotor and a DC brushless motor for its application. The permanent magnet rotor has a simple structure, high structural strength, reliable operation, and can greatly reduce the magnetic flux leakage phenomenon of the rotor and improve the performance of the rotor. ;

The DC brushless motor has a simple structure, wherein the rotor has a simple structure, high structural strength, reliable operation, can greatly reduce the magnetic flux leakage phenomenon of the rotor, and improve the performance of the rotor.

The purpose of this utility model is achieved through the following technical solutions.

A permanent magnet rotor, including an inner rotor iron core, several outer rotor iron cores and permanent magnets, a shaft hole is opened in the middle of the inner rotor iron core, a connecting part and a plastic package are also included, and the connecting part is set outside the inner rotor iron core , There are several card slots on the outer peripheral edge of the connecting part in the circumferential direction, the inner end of the outer rotor core is provided with a block, and several outer rotor cores are installed on the outer peripheral edge of the connecting part in the circumferential direction, and the block is nested Inside the card slot, a mounting slot is formed between two adjacent outer rotor cores, the permanent magnet is nested in the mounting slot, and the plastic package connects the inner rotor core, connecting parts, several outer rotor cores and permanent magnets into one .

The axial height of the inner rotor core mentioned above is smaller than the axial height of the outer rotor core.

The axial height of the coupling part mentioned above is smaller than the axial height of the inner rotor core, and an annular groove is formed between the end of the coupling part, the outer rotor core and the inner rotor core, and part of the plastic package is nested in the annular groove. inside the groove.

The above-mentioned outer wall of the inner rotor iron core protrudes several protrusions outwards, and the inner wall of the connecting part is provided with several grooves in the circumferential direction, and the protrusions are nested in the grooves.

As mentioned above, a through hole penetrating in the axial direction is opened on the outer rotor core, part of the plastic package passes through the middle of the through hole, and retaining hooks protrude from the opening of the installation groove and the outer rotor core on both sides. Part of the plastic package is filled in the opening between two adjacent retaining hooks, and the plastic package wraps the outer end surface of the permanent magnet.

As mentioned above, chamfers are provided on both sides of the inner end of the permanent magnet, and a gap is formed between the block at the inner end of the outer rotor core and the chamfer at the inner end of the permanent magnet, and part of the plastic package is filled in the gap .

The above-mentioned plastic package wraps the inner rotor core, the outer rotor core, the permanent magnets and the two ends of the connecting parts, and the peripheral surface of the outer rotor core is partially exposed.

The above-mentioned plastic-encapsulated casing is wrapped by injection molding on the outside of the inner rotor iron core, connecting parts, several outer rotor iron cores and permanent magnets to form a whole.

The above-mentioned connecting part is formed by laminating several silicon steel plates or aluminum plates.

A DC brushless motor, including a rotating shaft, a permanent magnet rotor, a stator assembly and a housing assembly, the permanent magnet rotor is installed on the rotating shaft, the stator assembly and the housing assembly are installed together and nested outside the permanent magnet rotor, and the two ends of the rotating shaft are supported on On the bearing of the housing assembly, the permanent magnet rotor includes an inner rotor core, several outer rotor cores and permanent magnets, a shaft hole is opened in the middle of the inner rotor core, and a connecting part and a plastic package are also included. On the outside of the inner rotor core, a number of card slots are opened on the outer peripheral edge of the connecting part in the circumferential direction, and a block is arranged on the inner end of the outer rotor core, and several outer rotor cores are installed on the outer peripheral edge of the connecting part in the circumferential direction. On the top, the block is nested in the slot, and the installation groove is formed between two adjacent outer rotor cores. The permanent magnet is nested in the installation groove. It is integrated with a permanent magnet.

Compared with the prior art, the utility model has the following effects:

1) The connecting part is set outside the inner rotor core, and several card slots are opened on the outer peripheral edge of the connecting part in the circumferential direction. The inner end of the outer rotor core is provided with a block, and several outer rotor cores are installed in the circumferential direction. On the outer peripheral edge of the connecting part, the clamping block is nested in the carding groove, and a mounting groove is formed between two adjacent outer rotor cores. Several outer rotor iron cores and permanent magnets are connected into one body, with simple structure, high structural strength, reliable operation, and can greatly reduce the magnetic flux leakage phenomenon of the rotor and improve the performance of the rotor;

2) An annular groove is formed between the end of the connecting part, the outer rotor core and the inner rotor core, and part of the plastic package is nested in the annular groove, which has a simple structure and effectively increases the connection between the plastic package and the inner rotor core. The structural strength between the components and the outer rotor core improves the overall performance of the rotor;

3) The outer wall of the inner rotor core protrudes a number of protrusions outwards, and the inner wall of the connecting part is provided with a number of grooves, and the protrusions are nested in the grooves, the structure is simple, and the inner rotor core is increased. The bonding force between the connecting parts, thereby improving the overall strength of the permanent magnet rotor;

4) There are retaining hooks protruding from the opening of the installation groove and the outer rotor cores on both sides, and part of the plastic package is filled in the opening between two adjacent retaining hooks. The structure is simple and effectively increases the structure of the permanent magnet rotor. Strength, while preventing the radial movement of the permanent magnet;

5) A gap is formed between the block at the inner end of the outer rotor core and the chamfer at the inner end of the permanent magnet, and part of the plastic package is filled in the gap, which effectively improves the structural strength of the permanent magnet rotor and reduces the permanent magnet. Flux leakage phenomenon ensures the high performance of the permanent magnet rotor;

6) The plastic-encapsulated shell is wrapped by injection molding on the outside of the inner rotor core, outer rotor core, permanent magnet and the two ends of the connecting parts. The peripheral surface of the outer rotor core is partially exposed. On the premise of ensuring product performance, the production process is simple. , Effectively improve production efficiency and reduce costs.

Description of drawings:

Fig. 1 is the perspective view of the permanent magnet rotor in the embodiment;

Fig. 2 is the top view of the permanent magnet rotor in the embodiment;

Fig. 3 is A-A sectional view among Fig. 2;

Fig. 4 is B-B sectional view among Fig. 3;

Figure 5 is a partial enlarged view of C-C in Figure 4;

Fig. 6 is an exploded view of a permanent magnet rotor without a plastic package in the embodiment;

Fig. 7 is a perspective view of a DC brushless motor in an embodiment;

Fig. 8 is a structural sectional view of the brushless DC motor in the embodiment.

Detailed ways:

The utility model will be described in further detail below through specific embodiments in conjunction with the accompanying drawings.

Embodiment 1: As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6, this embodiment is a permanent magnet rotor, including an inner rotor core 1, several outer rotor cores 2 and permanent magnet rotors. The magnet 3 has a shaft hole 11 in the middle of the inner rotor core 1, and also includes a coupling part 4 and a plastic package 5. The coupling part 4 is set outside the inner rotor core 1, and is circumferentially opened on the outer peripheral edge of the coupling part 4. There are several clamping slots 41, the inner end of the outer rotor core 2 is provided with clamping blocks 21, several outer rotor cores 2 are circumferentially installed on the outer peripheral edge of the coupling part 4, and the clamping blocks 21 are nested inside the clamping slots 41 The installation groove 22 is formed between two adjacent outer rotor cores 2, the permanent magnet 3 is nested inside the installation groove 22, and the plastic package 5 includes the inner rotor core 1, the connecting part 4, several outer rotor cores 2 and permanent magnets. The magnets 3 are connected into one body. The axial height L1 of the inner rotor core 1 is smaller than the axial height L2 of the outer rotor core 2 . The axial height L3 of the coupling part 4 is smaller than the axial height L1 of the inner rotor core 1, and an annular groove 6 is formed between the end of the coupling part 4, the outer rotor core 2 and the inner rotor core 1, and part of the plastic package 5 is nested in the annular groove 6. A plurality of protrusions 12 protrude outward from the outer wall of the inner rotor core 1 , and a plurality of grooves 42 are provided on the inner wall of the coupling part 4 , and the protrusions 12 are nested in the grooves 42 . A through hole 23 penetrating in the axial direction is opened on the outer rotor core 2, and a part of the plastic package 5 passes through the middle of the through hole 23, and stoppers protrude from the opening of the installation groove 22 and the outer rotor core 2 on both sides. The hook 24 and part of the plastic package 5 are filled in the opening between two adjacent retaining hooks 24 , and the plastic package 5 wraps the outer end surface of the permanent magnet 3 . Both sides of the inner end of the permanent magnet 3 are provided with chamfers 31 , a gap 7 is formed between the block 21 at the inner end of the outer rotor core 2 and the chamfer 31 at the inner end of the permanent magnet 3 , and part of the plastic package 5 Fill in the gap 7 inside. The plastic package 5 wraps the inner rotor core 1 , the outer rotor core 2 , the permanent magnet 3 and the two ends of the connecting part 4 , and the peripheral surface of the outer rotor core 2 is partially exposed. The plastic-encapsulated casing 5 is wrapped by injection molding on the outside of the inner rotor core 1 , the connecting part 4 , several outer rotor cores 2 and the permanent magnets 3 and forms a whole. The connecting part 4 is formed by laminating several silicon steel plates or aluminum plates.

Embodiment 2: As shown in Figures 1 to 8, this embodiment is a DC brushless motor, including a rotating shaft 81, a permanent magnet rotor 82, a stator assembly 83, and a casing assembly, and the casing assembly includes a casing 84, The front end cover 85 and the rear end cover 86, the permanent magnet rotor 82 are installed on the rotating shaft 81, the stator assembly 83 and the casing 84 are installed together and nested outside the permanent magnet rotor 82, the front end cover 85 and the rear end cover 86 are installed on the The two ends of the casing 84 and the two ends of the rotating shaft 81 are respectively supported on the bearings of the front end cover 85 and the rear end cover 86, and the front end of the rotating shaft 81 protrudes from the middle of the front end cover 85, and a motor controller 87 is installed on the rear end cover 86. , the permanent magnet rotor 82 includes an inner rotor core 1, a number of outer rotor cores 2 and permanent magnets 3, and a shaft hole 11 is opened in the middle of the inner rotor core 1, and also includes a coupling part 4 and a plastic package 5, the coupling part 4 Set on the outside of the inner rotor core 1, a number of card slots 41 are provided on the outer peripheral edge of the connecting part 4, and a block 21 is arranged on the inner end of the outer rotor core 2. Several outer rotor cores 2 are circumferentially Installed on the outer peripheral edge of the coupling part 4, the block 21 is nested in the slot 41, the installation slot 22 is formed between two adjacent outer rotor cores 2, the permanent magnet 3 is nested in the installation slot 22, and the plastic package 5. Connect the inner rotor iron core 1, the connecting part 4, several outer rotor iron cores 2 and the permanent magnets 3 into one.

The above embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited thereto, and any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention are equivalent All replacement methods are included within the protection scope of the present invention.

Claims (10)

1. a p-m rotor, comprise internal rotor iron core (1), some outer rotor iron cores (2) and permanent magnet (3), axis hole (11) is offered in the middle of internal rotor iron core (1), it is characterized in that: also include coupling components (4) and plastic-sealed body (5), coupling components (4) is sleeved on internal rotor iron core (1) outside, on the neighboring of coupling components (4), circumference offers some draw-in grooves (41), the medial end of outer rotor iron core (2) is provided with fixture block (21), some outer rotor iron cores (2) circumference is arranged on the neighboring of coupling components (4), fixture block (21) is nested in draw-in groove (41) the inside, mounting groove (22) is formed between adjacent two outer rotor iron cores (2), permanent magnet (3) is nested in mounting groove (22) the inside, plastic-sealed body (5) is internal rotor iron core (1), coupling components (4), some outer rotor iron cores (2) and permanent magnet (3) connect to one.

2. a kind of p-m rotor according to claim 1, is characterized in that: the axial height L1 of internal rotor iron core (1) is less than the axial height L2 of outer rotor iron core (2).

3. a kind of p-m rotor according to claim 2, it is characterized in that: the axial height L3 of coupling components (4) is less than the axial height L1 of internal rotor iron core (1), coupling components (4) end, form cannelure portion (6) between outer rotor iron core (2) and internal rotor iron core (1), part plastic-sealed body (5) be nested in cannelure portion (6) the inside.

4. a kind of p-m rotor according to claim 1 or 2 or 3, it is characterized in that: stretched out some projections (12) outside yearning last week at the outer wall of internal rotor iron core (1), on the inwall of coupling components (4), circumference is provided with some grooves (42), and projection (12) is nested in groove (42) the inside.

5. a kind of p-m rotor according to claim 4, it is characterized in that: on outer rotor iron core (2), offer the through hole (23) run through vertically, part plastic-sealed body (5) passes in the middle of through hole (23), in the opening portion of mounting groove (22), the outer rotor iron core (2) of both sides is protruding with stop hook (24), part plastic-sealed body (5) is filled in inside the opening portion between adjacent two stop hooks (24), and plastic-sealed body (5) is wrapped in the end face outside of permanent magnet (3).

6. a kind of p-m rotor according to claim 4, it is characterized in that: the medial end both sides of permanent magnet (3) are provided with chamfering (31), between the fixture block (21) and the chamfering (31) of permanent magnet (3) medial end of outer rotor iron core (2) medial end, be formed with gap (7), part plastic-sealed body (5) is filled in the inside, gap (7).

7. a kind of p-m rotor according to claim 1 or 2 or 3, it is characterized in that: described plastic-sealed body (5) is wrapped in outside the both ends of internal rotor iron core (1), outer rotor iron core (2), permanent magnet (3) and coupling components (4), and the periphery part of outer rotor iron core (2) exposes.

8. a kind of p-m rotor according to claim 1 or 2 or 3, is characterized in that: described plastic shell (5) is wrapped in internal rotor iron core (1), coupling components (4), some outer rotor iron cores (2) and permanent magnet (3) outside by injection moulding and forms an entirety.

9. a kind of p-m rotor according to claim 1 or 2 or 3, is characterized in that: described coupling components (4) is overrided to form by some silicon steel plates or aluminium sheet.

10. a DC brushless motor, comprise rotating shaft (81), p-m rotor (82), stator module (83) and casing assembly, p-m rotor (82) is arranged in rotating shaft (81), stator module (83) and casing assembly are installed together and are nested in p-m rotor (82) outside, rotating shaft (81) two supports, on the bearing of casing assembly, is characterized in that: described p-m rotor is the p-m rotor described by any one of claim 1 to 9.