Utility model content
The utility model aim to provide a kind of structure simple and can reduce leakage field, cogging torque rotor core and there is its permanent magnet rotor structure.
To achieve these goals, according to an aspect of the present utility model, provide a kind of rotor core, comprising: iron core body, its center has axis hole; Magnetic shoe groove, the radial direction along iron core body is arranged on iron core body, and iron core body is divided into multiple iron core block; Notch, the outer peripheral face being arranged at iron core body accordingly with magnetic shoe groove is connected with magnetic shoe groove.
Further, the center line of the length direction of notch and the axis of axis hole have angle.
Further, magnetic shoe groove along the radial direction of iron core body extend and the outer peripheral face running through iron core body to form notch.
Further, magnetic shoe groove is multiple, and multiple magnetic shoe groove is arranged around the axis at intervals of axis hole.
Further, multiple magnetic shoe groove is arranged uniformly around the axis at intervals of axis hole.
Further, the first openend on the length direction of notch and the second openend lay respectively on two end faces of iron core body.
Further, each notch is formed by least one first through hole on the outer peripheral face of iron core body.
Further, magnetic shoe groove and notch one_to_one corresponding are arranged, and wherein, each notch is formed by spaced first through hole of two on the outer peripheral face of iron core body.
Further, there is the part be connected with each other between adjacent two iron core blocks and strengthen magnetic bridge to be formed.
Further, the outer peripheral face of iron core body comprises multiple interconnective arc surface, and each notch is arranged at the intersection of adjacent two arc surfaces.
Further, each notch is formed by spaced first through hole of two on the outer peripheral face of iron core body.
Further, strengthen magnetic bridge to comprise: first strengthens magnetic bridge, formed by the first protuberance of the side along axis hole direction of an arc surface in adjacent two arc surfaces, first strengthens the side along axis hole direction that magnetic bridge extends to another arc surface in adjacent two arc surfaces; Second strengthens magnetic bridge, is formed by the second protuberance of the side along axis hole direction of another arc surface in adjacent two arc surfaces, and second strengthens the side along axis hole direction that magnetic bridge extends to an arc surface in adjacent two arc surfaces; 3rd strengthens magnetic bridge, strengthen magnetic bridge and second first to strengthen between magnetic bridge, the 3rd strengthens magnetic bridge is abutted against by the 4th protuberance of the side along axis hole direction of another arc surface in the 3rd protuberance of the side along axis hole direction of an arc surface in adjacent two arc surfaces and adjacent two arc surfaces and is formed; Wherein, the first side along axis hole direction strengthening magnetic bridge, the second reinforcement magnetic bridge, the 3rd reinforcement magnetic bridge and adjacent two arc surfaces forms two the first through holes jointly.
Further, rotor core also comprises: injection molding nylon circle, and be sheathed on the outer peripheral face of iron core body, on injection molding nylon circle, compartment of terrain is provided with the second through hole.
According to another aspect of the present utility model, additionally provide a kind of permanent magnet rotor structure, comprise rotor core, rotor core is above-mentioned rotor core.
Application the technical solution of the utility model, provides a kind of rotor core, comprises iron core body, magnetic shoe groove and notch.The center of iron core body has axis hole, and magnetic shoe groove is arranged on iron core body along the radial direction of iron core body, and iron core body is divided into multiple iron core block.Notch and magnetic shoe groove to be arranged at accordingly on the outer peripheral face of iron core body and to be connected with magnetic shoe groove.Owing to having gone every magnetic bridge, therefore can reduce rotor leakage, air gap flux density increases, and improves the torque output capability of motor, guarantees the structural safety of motor.This rotor core structure is simple and can reduce leakage field, cogging torque.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the utility model in detail in conjunction with the embodiments.
As shown in Figure 1, the utility model provides a kind of rotor core.
Particularly, this rotor core comprises iron core body 10, magnetic shoe groove 20 and notch 30.Wherein, the center of iron core body 10 has axis hole 11, magnetic shoe groove 20 is arranged on so that iron core body 10 is divided into multiple iron core block on iron core body 10 along the radial direction of iron core body 10, and notch 30 and magnetic shoe groove 20 to be arranged at accordingly on the outer peripheral face of iron core body 10 and to be connected with magnetic shoe groove 20.
Owing to having gone every magnetic bridge, therefore can reduce rotor leakage, air gap flux density increases, and improves the torque output capability of motor, guarantees the structural safety of motor.This rotor core structure is simple and can reduce leakage field, cogging torque.
From the above, the center line of the length direction of notch 30 with can be parallel between axis hole 11, also can have angle and be obliquely installed.The notch 30 of rotor core adopts flume structure, has the effect reducing cogging torque.
Adopt degaussing bridge to reduce leakage field in above-described embodiment of the present utility model, propose to adopt skew notch to reduce cogging torque, therefore this rotor core has the advantage of high power density and low torque ripple.
As shown in Figure 2, the center line of the length direction of notch 30 and the axis of axis hole 11 have angle.That is notch 30 is that on the outer peripheral face being arranged on iron core body 10 of inclination, notch 30 is skew notch, and the center line of the length direction of skew notch and the axis of axis hole 11 have angle.Adopt flume structure, can cogging torque be reduced.
As depicted in figs. 1 and 2, magnetic shoe groove 20 along the radial direction of iron core body 10 extend and the outer peripheral face running through iron core body 10 to form notch 30.Notch 30 is connected with magnetic shoe groove 20, and one end of its length direction of magnetic shoe groove 20 is connected to axis hole 11, and the other end of magnetic shoe groove 20 forms notch 30 on the outer peripheral face of iron core body 10.
As depicted in figs. 1 and 2, each notch 30 is formed by least one first through hole 33 on the outer peripheral face of iron core body 10.
As depicted in figs. 1 and 2, magnetic shoe groove 20 and notch 30 one_to_one corresponding are arranged, and a magnetic shoe groove 20 have a notch 30.Magnetic shoe groove 20 is multiple, and multiple magnetic shoe groove 20 is arranged around the axis at intervals of axis hole 11.Preferably, multiple magnetic shoe groove 20 is arranged uniformly around the axis at intervals of axis hole 11.
As shown in Figure 2, the outer peripheral face of iron core body 10 comprises multiple interconnective arc surface 12, and like this, when rotated, magnetic field can keep in sinusoidal wave waveform p-m rotor, and when magneto runs, noise is less, and runs more steady.Each notch 30 is arranged at the intersection of adjacent two arc surfaces 12.
The utility model provides first preferred embodiment, and as shown in Figure 1, the first openend 31 on the length direction of notch 30 and the second openend 32 lay respectively on two end faces of iron core body 10.Notch 30 in the present embodiment is gap, magnetic shoe groove 20 along the radial direction of iron core body 10 extend and the outer peripheral face running through iron core body 10 to form this gap.
The utility model additionally provides second preferred embodiment, as shown in Figure 2, preferably, each notch 30 is formed by spaced first through hole 33 of two on the outer peripheral face of iron core body 10, has the part be connected with each other and strengthen magnetic bridge 40 to be formed between adjacent two iron core blocks.Particularly, the outer peripheral face of the outer peripheral face of the part iron core body 10 between adjacent two the first through holes 33 and the part iron core body 10 between each first through hole 33 and the end face of iron core body 10 is formed strengthens magnetic bridge 40.
And then ground, as shown in Figure 2, strengthen magnetic bridge 40 and comprise the first reinforcement magnetic bridge 41, second reinforcement magnetic bridge 42 and the 3rd reinforcement magnetic bridge 43.
First strengthens magnetic bridge 41 is formed by the first protuberance of the side along axis hole 11 direction of an arc surface 12 in adjacent two arc surfaces 12, and first strengthens the side along axis hole 11 direction that magnetic bridge 41 extends to another arc surface 12 in adjacent two arc surfaces 12.What the side along axis hole 11 direction of an arc surface 12 protruded stretches out first protuberance, and this first protuberance stretches to the side along axis hole 11 direction to another relative arc surface 12, and namely this first protuberance is formed as the first reinforcement magnetic bridge 41.
Second strengthens magnetic bridge 42 is formed by the second protuberance of the side along axis hole 11 direction of another arc surface 12 in adjacent two arc surfaces 12, and second strengthens the side along axis hole 11 direction that magnetic bridge 41 extends to an arc surface 12 in adjacent two arc surfaces 12.It is identical that structure and first strengthens magnetic bridge 41, first strengthen magnetic bridge 41 protrudes from an arc surface 12 extend out to another arc surface 12, and second reinforcement magnetic bridge 42 protrude from another arc surface 12 extend out to an arc surface 12.It is contrary that first reinforcement magnetic bridge 41 and second strengthens magnetic bridge 42 bearing of trend.
3rd strengthens magnetic bridge 43, strengthening magnetic bridge 41 and second first strengthens between magnetic bridge 42, and the 3rd strengthens magnetic bridge 43 is abutted against by the 4th protuberance 45 of the side along axis hole 11 direction of another arc surface 12 in the 3rd protuberance 44 of the side along axis hole 11 direction of an arc surface 12 in adjacent two arc surfaces 12 and adjacent two arc surfaces 12 and formed.In detail, 3rd reinforcement magnetic bridge 43 is abutted against by the 3rd protuberance 44 and the 4th protuberance 45 and is formed, what the 3rd protuberance 44 was protruded by the side along axis hole 11 direction of an arc surface 12 in adjacent two arc surfaces 12 is formed, what the 4th protuberance 45 was protruded by the side along axis hole 11 direction of another arc surface 12 is formed, and the 3rd protuberance 44 and the 4th protuberance 45 extend to mutually to abut strengthens magnetic bridge 43 to form the 3rd.
As shown in Figure 2, the first side along axis hole 11 direction strengthening magnetic bridge 41, second reinforcement magnetic bridge 42, the 3rd reinforcement magnetic bridge 43 and adjacent two arc surfaces 12 forms two the first through holes 33 jointly.
(not shown) in the 3rd embodiment, each notch 30 is formed by multiple spaced first through hole 33 on the outer peripheral face of iron core body 10, structure and second embodiment similar, just each notch 30 is formed by the first through hole 33 more than two.
(not shown) in the 4th embodiment, each notch 30 is formed by first through hole 33 on the outer peripheral face of iron core body 10, and the outer peripheral face of the part iron core body 10 between this first through hole 33 and end face of iron core body 10 is formed strengthens magnetic bridge 40.
As shown in Figure 3 and Figure 4, rotor core also comprises injection molding nylon circle 50, is sheathed on the outer peripheral face of iron core body 10, and on injection molding nylon circle 50, compartment of terrain is provided with the second through hole 51.Sheathed injection molding nylon circle 50 on the outer peripheral face of iron core body 10, can use injection-moulded plastic to strengthen rotor strength and increase and strengthen magnetic bridge.
Fig. 5 shows the Changing Pattern figure of air gap flux density of the present utility model and slot opening, and wherein, A is air gap flux density, and its unit is T; B is slot opening, and unit is mm.Can find out, along with the increase gradually of the slot opening of notch 30, leakage field reduces gradually, and air gap flux density increases gradually.
Fig. 6 shows the Changing Pattern figure of cogging torque peak value of the present utility model and slot opening, and wherein, C is cogging torque peak value, and its unit is mNM; B is slot opening, and unit is mm.Can find out, along with the increase gradually of notch 30 slot opening, cogging torque is the variation tendency of first increases and then decreases.
Fig. 7 shows the cogging torque numerical value figure of skewed slot of the present utility model and non-skewed slot, and wherein, D is cogging torque, and its unit is mNM; α is electrical degree, and unit is degree.Can find out, wherein the structure of curve 1 to be notch 30 be not skewed slot, curve 2 for notch 30 are flume structures, can significantly find out, this flume structure effectively can reduce cogging torque.
According to another aspect of the present utility model, additionally provide a kind of permanent magnet rotor structure, comprise rotor core, rotor core is the rotor core in above-described embodiment.Permanent magnet rotor structure in the present embodiment, be made up of rotor core, magnetic shoe, injection molding nylon etc., above-mentioned rotor core goes every magnetic bridge thus forms notch, the oblique certain angle of above-mentioned notch, in addition in order to strengthen the intensity of rotor core, add reinforcement magnetic bridge, add an injection molding nylon outside rotor core simultaneously.The application's scheme permanent magnet rotor structure, on the one hand, goes can reduce rotor leakage every magnetic bridge, and on the other hand, rotor notch adopts flume structure, has the effect reducing cogging torque.
The application's scheme rotor core fabrication processing, main point three steps:
The first step: stamping rotor iron core profile: punching press is carried out to silicon steel sheet and forms rotor iron core lamination profile;
Second step: processing skewed slot: after completing above-mentioned Sheet Metal Forming Technology, skewed slot will be processed to rotor iron core lamination, and need the certain angle that staggers between the skewed slot of every sheet rotor iron core lamination;
3rd step: laminate rotor punching: said stator punching slices are laminated and forms rotor core.
As can be seen from the above description, the utility model the above embodiments achieve following technique effect:
Owing to having gone every magnetic bridge, therefore can reduce rotor leakage, air gap flux density increases, improve the torque output capability of motor, adopt flume structure simultaneously, can cogging torque be reduced, strengthen magnetic bridge at rotor surface injection molding nylon die cavity and increase in addition, guarantee electric machine structure safety.Rotor core of the present utility model and have its permanent magnet rotor structure, structure is simple and can reduce leakage field, cogging torque.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.