CN108964302A - A kind of magnetic core of motor - Google Patents

Abstract

The invention discloses a kind of magnetic cores of motor, including central part and from the outwardly extending multiple teeth of central part, the circumferencial direction setting of tooth along the central part, each tooth includes denticle, bizet is connected to denticle respectively by two necks and two bizets, neck, and two bizets respectively extend beyond the opposite side of denticle, each of two necks of each tooth have minimum widith, which is 0.1-0.3 times of denticle width.A kind of magnetic core of motor of the invention, can increase the peak value of the cogging torque of motor.

Description

A kind of magnetic core of motor

Technical field

The present invention relates to motor technology field more particularly to a kind of magnetic cores of motor.

Background technique

Permanent magnetism brush motor generally includes stator and rotor, and stator includes the shell and permanent magnetism of installation on an interior surface of the housing Body, rotor include rotary shaft, fixed magnetic core and commutator on the rotary shaft and the rotor windings around core FCl, stator with There are slot effects between rotor, in some applications, it is desirable to which motor has biggish cogging torque, for example, for roller shutter electricity Machine needs to increase the cogging torque of motor, allows motor in the case where no any additional brake apparatus any Designated position stops shutter, to simplify structure and reduce the cost of roller shutter.Have therefore, it is necessary to one kind and increases tooth socket turn The motor of square.

Technical solution

The invention mainly solves the technical problem of providing a kind of magnetic cores of motor characterized by comprising central portion Multiple teeth are divided to extend outwardly on respective longitudinal direction from center portion, tooth is arranged along the circumferencial direction of central part, wherein Each tooth includes denticle, two necks and two bizets, and denticle has transverse width, neck on perpendicular to denticle longitudinal direction Portion extends from the outer end of denticle, corresponding longitudinal direction and each other bifurcated, and each neck is perpendicular to the vertical of each neck To direction on have transverse width, two bizets be connected respectively to far from tooth main body neck end, and circumferentially side Extend to towards the opposite side of denticle, wherein the minimum value of the transverse width of each neck is one that each neck is relied on 0.1-0.3 times of the transverse width of a denticle.

Optionally, wherein forming recess portion between two bizets of each tooth, it is the 0.6 of denticle width that recess portion, which has width, 0.8 times of opening again.

Optionally, wherein forming recess portion between two bizets of each tooth, recess portion has radial depth, opens for recess portion 0.7 times 1.8 times of mouth width degree.

Optionally, wherein forming recess portion between two bizets of each tooth, recess portion is U-shaped, V-arrangement or rectangular.

The beneficial effects of the present invention are:

A kind of magnetic core of motor of the invention, can increase the peak value of the cogging torque of motor.

Detailed description of the invention

Fig. 1 is the perspective view of motor according to an embodiment of the invention.

Fig. 2 is the side view of the motor of Fig. 1.

Fig. 3 is cross-sectional view of the motor shown in Fig. 2 along A-A line.

Fig. 4 is the cross-sectional view along the motor of Fig. 2 of line B-B.

Fig. 5 shows the shell and magnet of the motor of Fig. 1.

Embodiment

The preferred embodiments of the present invention will be described in detail below so that advantages and features of the invention can be easier to by It will be appreciated by those skilled in the art that so as to make a clearer definition of the protection scope of the present invention.

Referring to Fig.1, motor 100 according to an embodiment of the invention is permanent magnet motor, and motor 100 includes stator 20 and rotor 60, stator 20 includes the end cap 23 of cylindrical housings 21 and the open end for being installed to shell 21 open at one end, is turned Son 60 is rotatably mounted on stator 20.Referring to Figure 2 to Figure 4, the end wall of cylindrical housings 21 is provided with bearing block 22, bearing 28 are mounted in bearing block 22, it is preferable that bearing 28 is that the d-axis with axial contour line is held, and another bearing block 24 is arranged At the middle part of end cap 23, bearing 29 is arranged in bearing block 24, it is preferable that bearing 29 has curved axial profile line.Rotation Axis 61 by bearing 28 and 29 support, so as to relative to stator 20 rotate, rotor 60 include rotary shaft 61, magnetic core 63 and be fixed on turn Commutator 65 on axis 61, and the rotor windings (not shown) that is wound on magnetic core 63 and be electrically connected with commutator 65, stator 20 It further include the one or more permanent magnets 31 for being installed to the inner surface of shell 21, the brush assembly of electric being mounted on end cap 23, installation To the terminal 25 etc. of end cap 23.One or more permanent magnets 31 form multiple permanent-magnet poles, and terminal 25 is configured as and external power supply It connects and powers to brush assemblies, the commutator segments of brush assembly of electric and commutator 65 are in electrical contact, to power to rotor windings.

Referring to Fig. 5, the ratio of the outer diameter OD1 of the internal diameter ID1 and shell 21 of shell 21 is less than 0.93, that is to say, that shell 21 radial thickness is higher than the preset percentage of the outer diameter OD1 of shell 21, to be mounted on the difference on the inner surface of shell 21 Permanent-magnet pole can pass through shell 21 formed closure flux circuit, it is preferable that the magnetic energy product of permanent magnet 31 be greater than 4 megaohms, with increase Add the peak value of motor cogging torque.In the present embodiment, stator 20 includes two permanent magnets 31 (Fig. 4), is respectively formed two and determines Sub- magnetic pole, rotor 60 include three teeth, and three slots are respectively formed between adjacent tooth, and therefore, motor 100 can be referred to as 2 pole, 3 slot Permanent magnet DC brushless motor, it is preferable that the peak value of motor cogging torque is in the range of 8 μm~14nm.

The sequencing of above embodiments is not only for ease of description, represent the advantages or disadvantages of the embodiments.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features； And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and Range.

Claims (4)

1. a kind of magnetic core of motor characterized by comprising the multiple teeth of center portion are on respective longitudinal direction from center Part extends outwardly, and tooth is arranged along the circumferencial direction of central part, wherein each tooth includes denticle, two necks and two hats Portion, denticle have transverse width on perpendicular to denticle longitudinal direction, and neck extends from the outer end of denticle, corresponding longitudinal direction side To with bifurcated each other, each neck on the longitudinal direction perpendicular to each neck have transverse width, two bizets It is connected respectively to the end of the neck far from tooth main body, and is along the circumferential direction extended towards the opposite side of denticle, wherein each The minimum value of the transverse width of neck is 0.1-0.3 times of the transverse width for the denticle that each neck is relied on.

2. a kind of magnetic core of motor according to claim 1, it is characterised in that: wherein two bizets of each tooth it Between form recess portion, it is 0.6 times 0.8 times of opening of denticle width that recess portion, which has width,.

3. a kind of magnetic core of motor according to claim 1, it is characterised in that: wherein two bizets of each tooth it Between form recess portion, recess portion has radial depth, is 0.7 times 1.8 times of recess portion opening width.

4. a kind of magnetic core of motor according to claim 1, it is characterised in that: wherein two bizets of each tooth it Between form recess portion, recess portion is U-shaped, V-arrangement or rectangular.