CN101478210A - Asymmetric groove shaped permanent synchronizing motor - Google Patents

Abstract

An asymmetric groove-shaped permanent magnet synchronous motor comprises a stator and a rotor; the rotor is in the stator and coaxial with the stator, so as to form a concentrated winding stator type permanent magnet synchronous motor; a rotor shaft is arranged on the axes of the rotor; a plurality of permanent magnets are evenly arranged on the rotor in the circumferential direction of the rotor; a stator winding is arranged on the stator. The stator is formed by surrounding a plurality of same circumferential stator sections, and rabbets are formed between the individual circumferential stator sections respectively; the circumferential stator sections are formed by laminating a plurality of separate stator tooth stamped steels, and the tooth crowns of the stator tooth stamped steels are asymmetric structures about the stator tooth stamped steels. The torque of tooth space is reduced in the structure of the asymmetric groove-shaped permanent magnet synchronous motor.

Description

Asymmetric groove shaped permanent synchronizing motor

Technical field

The present invention relates to the permagnetic synchronous motor field, especially stator is concentrated the asymmetric groove shaped permanent synchronizing motor of winding construction.

Background technology

At present, in the prior art, general permagnetic synchronous motor is formed by stator and rotor two parts.Wherein stator all adopts with a kind of punching and laminates.For distributed winding, the control of cogging torque can be adopted the method for skewed stator slot.But for the stator structure of concentrating winding, skewed slot is difficult to accomplish on technology, can only adopt the way of the oblique utmost point of rotor permanent magnet, the corresponding cost that increased.In order to reduce the moment of inertia of rotor, general opened round hole in rotor core all.But circular port is subjected to radius limit, and is can not Kai Detai big, make cogging torque to reduce amplitude limited.

Summary of the invention

In order to solve the problems referred to above that prior art exists, the objective of the invention is to, a kind of asymmetric groove shaped permanent synchronizing motor is provided, specifically is a kind of under the structure of existing concentrated winding, the permanent magnet synchronous motor that cogging torque is reduced, concrete technical scheme is as follows:

A kind of asymmetric groove shaped permanent synchronizing motor comprises stator and rotor, rotor in stator and stator coaxial, constitute the permanent magnet synchronous motor of concentrated winding stator form; The axis of described rotor is provided with armature spindle; Rotor upper edge rotor circumferentially evenly be provided with a plurality of permanent magnets; Described stator is provided with stator winding.Described stator is surrounded by a plurality of identical circumferential stator segments, leaves notch between each circumferential stator segment; Each circumferential stator segment is overrided to form by the stator tooth punching of a plurality of separation, and the crown of stator tooth punching is the unsymmetric structure about the center line of stator tooth punching.

The shape of described stator tooth punching is the part of stator annulus that radial section becomes; Below crown is located at stator teeth; Two parts shape difference that this crown is divided into by the center line of stator tooth punching; The crown of adjacent two stator tooth punchings constitutes notch; The tooth portion of two adjacent stator tooth punchings surrounds the groove that is used to settle stator winding.

The both sides of the edge of stator tooth punching yoke portion are provided with the corresponding recessed and projection that is used to locate, the projection of stator tooth punching be located at adjacent punching recessed in; Also be provided with in the stator tooth punching and be used for stator that a plurality of punchings laminate from button hole.The place, arc top of described stator tooth punching outer rim is provided with the zigzag recess, is used for the stator welding.

Described each circumferential stator segment axially is being a segmentation structure, and circumferentially each section of stator segment is staggered, and is provided with the transition stator segment between adjacent two sections, and this is decided field and is overrided to form by the transition stator punching.Described transition stator punching is identical with yoke portion shape with the tooth portion of stator tooth punching; The crown of transition stator punching is about the center line symmetry of transition stator punching.

Described rotor core has a plurality of identical rotor-core laminations to be overrided to form; Rotor-core lamination has a plurality of tri-angle-holed; Corresponding permanent magnet position is pointed at a described leg-of-mutton angle; Described tri-angle-holed circumferentially evenly distributed along rotor.If the quantity N of described permanent magnet, tri-angle-holed quantity is N, a permanent magnet of each tri-angle-holed correspondence; Or tri-angle-holed quantity is N/2, permanent magnet in interval between two permanent magnets of adjacent two triangle hole correspondence.N is an even number, and N 〉=2.

Between adjacent two triangle hole, also be provided with and be used for the rivet hole that a plurality of rotor-core laminations laminate.

Described tri-angle-holed one side with permanent magnet position correspondence is arc, and this arc makes triangle be similar to heart to triangle indent and armature spindle outer circumferential shape correspondence.

Described stator tooth punching is crown near the inside part in the center of circle.

The notch of stator is the root that cogging torque produces.Because the stator core material is a silicon steel sheet, its relative permeability is thousands of times of air, has therefore caused magnetic flux path magnetic resistance skewness along the circumferential direction, increases thousands of times suddenly at notch place magnetic resistance, has formed reluctance torque.Thus, the present invention takes the crown of stator punching about the asymmetric structure of tooth center line, and subsection interleaving arranges, and is interspersed with regard to the notch that has caused stator, makes the distribution of variation on circumference of magnetic resistance also become and is staggered.

If electric machine stator iron length is L, it is divided into two sections in the axial direction.Then at the crown of stator punching during about tooth center line symmetry, the reluctance torque of establishing each stator teeth correspondence is:

$T=\left\{\begin{array}{c}a\×x(0\≤x\≤\mathrm{Wt}/2)\\ a\×\mathrm{Wt}-a\×x(\mathrm{Wt}/2\mathrm{dxdWt})\end{array}\right\}$

Wherein, x be permanent magnet axially with respect to the distance of notch, Wt is a tooth pitch, a is constant and a〉0.Two sections common reluctance torque maximums that produce of stator are (T * 2) max=a * Wt/2 * 2=a * Wt

At the crown of stator punching during about tooth center line symmetry, owing to be staggered, the maximum magnetic flux resistive torque place position difference of generation,

For first section stator:

$\mathrm{<figure-callout\; id="1"\; label="T"\; filenames="A200910028476E00071.png,A200910028476E00081.png"\; state="\{\{state\}\}">T</figure-callout>}1=\left\{\begin{array}{cc}a1\&times;x& (0\&le;x\&le;(\mathrm{Wt}/2-\mathrm{\&delta;}))\\ a2\&times;x+a3& ((\mathrm{Wt}/2-\mathrm{\&delta;})\&le;x\&le;\mathrm{Wt})\end{array}\right.$

For second section stator:

$\mathrm{<figure-callout\; id="1"\; label="T"\; filenames="A200910028476E00071.png,A200910028476E00081.png"\; state="\{\{state\}\}">T</figure-callout>}1=\left\{\begin{array}{cc}\mathrm{<figure-callout\; id="1"\; label="b"\; filenames="A200910028476E00071.png,A200910028476E00081.png"\; state="\{\{state\}\}">b</figure-callout>}1\&times;x& (0\&le;x\&le;(\mathrm{Wt}/2+\mathrm{\&delta;}))\\ \mathrm{<figure-callout\; id="2"\; label="b"\; filenames="A200910028476E00071.png,A200910028476E00081.png"\; state="\{\{state\}\}">b</figure-callout>}2\&times;x+b3& ((\mathrm{Wt}/2+\mathrm{\&delta;})\&le;x\&le;\mathrm{Wt})\end{array}\right.$

Wherein, x be permanent magnet axially with respect to the distance of notch, Wt is a tooth pitch, a is constant and 0＜δ＜Wt/2.Then two sections common reluctance torques that produce of stator are:

$\mathrm{<figure-callout\; id="1"\; label="T"\; filenames="A200910028476E00071.png,A200910028476E00081.png"\; state="\{\{state\}\}">T</figure-callout>}1+\mathrm{<figure-callout\; id="2"\; label="T"\; filenames="A200910028476E00071.png,A200910028476E00081.png"\; state="\{\{state\}\}">T</figure-callout>}2=\left\{\begin{array}{cc}(a1+b1)\&times;x& (0\&le;x\&le;(\mathrm{Wt}/2-\mathrm{\&delta;}))\\ (a2+b1)\&times;x+a3& ((\mathrm{Wt}/2-\mathrm{\&delta;})\&le;x\&le;(\mathrm{Wt}/2+\mathrm{\&delta;}))\\ (a2+b2)\&times;x+(a3+b3)& ((\mathrm{Wt}/2+\mathrm{\&delta;})\&le;x\&le;\mathrm{Wt})\end{array}\right.$

Know that by the electromagnetic field relation reluctance torque maximum is relevant with the position of notch again,

$\left\{\begin{array}{c}a1=\frac{\mathrm{Wt}/2}{\mathrm{Wt}/2-\mathrm{\&delta;}}\&times;a\\ a2=-\frac{\mathrm{Wt}/2}{\mathrm{Wt}/2+\mathrm{\&delta;}}\&times;a\\ a3=\frac{{\mathrm{<figure-callout\; id="2"\; label="Wt"\; filenames="A200910028476E00071.png,A200910028476E00081.png"\; state="\{\{state\}\}">Wt</figure-callout>}}^2/2}{\mathrm{Wt}/2+\mathrm{\&delta;}}\&times;a\\ \mathrm{<figure-callout\; id="1"\; label="b"\; filenames="A200910028476E00071.png,A200910028476E00081.png"\; state="\{\{state\}\}">b</figure-callout>}1=\frac{\mathrm{Wt}/2}{\mathrm{Wt}/2+\mathrm{\&delta;}}\&times;a\\ \mathrm{<figure-callout\; id="2"\; label="b"\; filenames="A200910028476E00071.png,A200910028476E00081.png"\; state="\{\{state\}\}">b</figure-callout>}2=-\frac{\mathrm{Wt}/2}{\mathrm{Wt}/2-\mathrm{\&delta;}}\&times;a\\ \mathrm{<figure-callout\; id="3"\; label="b"\; filenames="A200910028476E00071.png,A200910028476E00081.png"\; state="\{\{state\}\}">b</figure-callout>}3=-\frac{{\mathrm{<figure-callout\; id="2"\; label="Wt"\; filenames="A200910028476E00071.png,A200910028476E00081.png"\; state="\{\{state\}\}">Wt</figure-callout>}}^2/2}{\mathrm{Wt}/2-\mathrm{\&delta;}}\&times;a\end{array}\right.$

Calculating learns, (T1+T2) $\max =a\&times;\mathrm{Wt}\&times;\frac{\mathrm{Wt}/2}{\mathrm{Wt}/2+\mathrm{\&delta;}}$

So (T1+T2) max＜(T * 2) max

Because the magnetic field in the rotor core is static relatively, therefore according to the trend of the magnetic flux path and the magnetic line of force, in rotor core, dig and be similar to the tri-angle-holed of heart, reduced the moment of inertia of motor.

Description of drawings

Fig. 1 is a stator radial structure schematic diagram

Fig. 2 is the stator tooth punching structural representation of stator segment I

Fig. 3 is the stator tooth punching structural representation of stator segment II

Fig. 4 is the transition stator laminating structure schematic diagram of transition stator segment

Fig. 5 is the rotor-core lamination structural representation

Fig. 6 is circumferential stator segment structural representation

Fig. 7 is a stator radial section schematic diagram

Fig. 8 is the stator structure schematic diagram

1 stator segment I; 2 transition stator segments; 3 stator segment II; 4 stators are from button hole; 5 stator tooth punching yoke portions; 6 crowns; 7 permanent magnets; 8 rotor-core laminations; 9 foramen cordiformes; 10 rivet holes; 11 armature spindles; 12 grooves; 13 notches; 14 stator tooth punching tooth portions; 15 be used to locate recessed; 16 projections.

Embodiment

The invention will be further described below in conjunction with accompanying drawing and embodiment.

A kind of asymmetric groove shaped permanent synchronizing motor comprises stator and rotor, rotor in stator and stator coaxial, constitute the permanent magnet synchronous motor of concentrated winding stator form; The axis of described rotor is provided with armature spindle; Rotor upper edge rotor circumferentially evenly be provided with a plurality of permanent magnets; Described stator is provided with stator winding.Described stator is surrounded by a plurality of identical circumferential stator segments, leaves notch between each circumferential stator segment; Each circumferential stator segment is overrided to form by the stator tooth punching of a plurality of separation, and the crown of stator tooth punching is the unsymmetric structure about the center line of stator tooth punching.

The shape of described stator tooth punching is the part of stator annulus that radial section becomes; Below crown is located at stator teeth; Two parts shape difference that this crown is divided into by the center line of stator tooth punching; The crown of adjacent two stator tooth punchings constitutes notch; The tooth portion of two adjacent stator tooth punchings surrounds the groove that is used to settle stator winding.

The both sides of the edge of stator tooth punching yoke portion are provided with the corresponding recessed and projection that is used to locate, the projection of stator tooth punching be located at adjacent punching recessed in; Also be provided with in the stator tooth punching and be used for stator that a plurality of punchings laminate from button hole.The place, arc top of described stator tooth punching outer rim is provided with the zigzag recess, is used for the stator welding.

Described each circumferential stator segment axially is being a segmentation structure, and circumferentially each section of stator segment is staggered, and is provided with the transition stator segment between adjacent two sections, and this is decided field and is overrided to form by the transition stator punching.Described transition stator punching is identical with yoke portion shape with the tooth portion of stator tooth punching; The crown of transition stator punching is about the center line symmetry of transition stator punching.

Described rotor core has a plurality of identical rotor-core laminations to be overrided to form; Rotor-core lamination has a plurality of tri-angle-holed; Corresponding permanent magnet position is pointed at a described leg-of-mutton angle; Described tri-angle-holed circumferentially evenly distributed along rotor.If the quantity N of described permanent magnet, tri-angle-holed quantity is N, a permanent magnet of each tri-angle-holed correspondence; Or tri-angle-holed quantity is N/2, permanent magnet in interval between two permanent magnets of adjacent two triangle hole correspondence.N is an even number, and N 〉=2.

Between adjacent two triangle hole, also be provided with and be used for the rivet hole that a plurality of rotor-core laminations laminate.

Described tri-angle-holed one side with permanent magnet position correspondence is arc, and this arc makes triangle be similar to heart to triangle indent and armature spindle outer circumferential shape correspondence.

In this example, circumferentially stator segment has 12, and each circumferential stator segment is divided into three sections stator segment II that promptly are located at the stator segment I at circumferential stator segment two ends and are located at circumferential stator segment centre position, also is provided with the transition stator segment between described two stator segments.The shape of the stator tooth punching of stator segment I as shown in Figure 2, the shape of the stator tooth punching of stator segment II as shown in Figure 3, the transition stator punching of transition stator segment as shown in Figure 4, circumferentially stator segment is as shown in Figure 6.

With reference to figure 7,8, the notch of adjacent two circumferential stator segments departs from the groove center line, and the subsection interleaving arrangement, is interspersed with regard to the notch that has caused stator, adopt the asymmetric distribution of notch to reduce reluctance torque, make the distribution of variation on circumference of magnetic resistance also become and be staggered.

With reference to figure 5, permanent magnet has 8, evenly is located in the corresponding groove of rotor periphery (because this is a mode more common in the prior art, not to be described further at this).In this example, one side tri-angle-holed be the circular arc of indent, be similar to heart.Permanent magnet is pointed at the tip of foramen cordiforme.Rivet hole also is provided with 4.Because the magnetic field in the rotor core is static relatively, therefore according to magnetic flux path, the trend of the magnetic line of force is dug on the rotor aligning and is similar to the tri-angle-holed of heart, has reduced the moment of inertia of motor.

In this example, tri-angle-holed quantity also can be identical with permanent magnet quantity.

Circumferentially stator segment, permanent magnet, from button hole, circumferentially the quantity of stator segment longitudinal divisions etc. can be according to actual the requirements design of engineering, and is just further for example clear at this.

Claims (10)

1, a kind of asymmetric groove shaped permanent synchronizing motor comprises stator and rotor, rotor in stator and stator coaxial, constitute the permanent magnet synchronous motor of concentrated winding stator form; The axis of described rotor is provided with armature spindle; Rotor upper edge rotor circumferentially evenly be provided with a plurality of permanent magnets; Described stator is provided with stator winding, it is characterized in that described stator is surrounded by a plurality of identical circumferential stator segments, leaves notch between each circumferential stator segment; Each circumferential stator segment is overrided to form by the stator tooth punching of a plurality of separation, and the crown of stator tooth punching is the unsymmetric structure about the center line of stator tooth punching.

2, asymmetric groove shaped permanent synchronizing motor according to claim 1, the shape that it is characterized in that described stator tooth punching is the part of stator annulus that radial section becomes; Two parts shape difference that this crown is divided into by the center line of stator tooth punching; The crown of adjacent two stator tooth punchings constitutes notch; The tooth portion of two adjacent stator tooth punchings surrounds the groove that is used to settle stator winding.

3, asymmetric groove shaped permanent synchronizing motor according to claim 2 is characterized in that the both sides of the edge of described stator tooth punching yoke portion are provided with the corresponding recessed and projection that is used to locate; Also be provided with in the stator tooth punching and be used for stator that a plurality of punchings laminate from button hole.

4, asymmetric groove shaped permanent synchronizing motor according to claim 2 is characterized in that the place, arc top of described stator tooth punching outer rim is provided with the zigzag recess.

5, asymmetric groove shaped permanent synchronizing motor according to claim 1 and 2, it is characterized in that described each circumferential stator segment axially is being a segmentation structure, circumferentially in the axial direction each of each section of stator segment section is staggered, be provided with the transition stator segment between adjacent two sections, transition is decided field and is overrided to form by the transition stator punching.

6, asymmetric groove shaped permanent synchronizing motor according to claim 5 is characterized in that described transition stator punching is identical with yoke portion shape with the tooth portion of stator tooth punching; The crown of transition stator punching is about the center line symmetry of transition stator punching.

7, asymmetric groove shaped permanent synchronizing motor according to claim 1 and 2 is characterized in that the rotor core of described rotor is overrided to form by the identical rotor-core lamination of a plurality of shapes; Rotor-core lamination has a plurality of tri-angle-holed, and they are circumferentially evenly distributed along rotor; Corresponding permanent magnet position is pointed at a described leg-of-mutton angle.

8, asymmetric groove shaped permanent synchronizing motor according to claim 7 is characterized in that establishing the quantity N of described permanent magnet, and tri-angle-holed quantity is N, a permanent magnet of each tri-angle-holed correspondence;

Or tri-angle-holed quantity is N/2, permanent magnet in interval between two permanent magnets of adjacent two triangle hole correspondence.

9, asymmetric groove shaped permanent synchronizing motor according to claim 7 is characterized in that also being provided with between adjacent two triangle hole and is used for the rivet hole that a plurality of rotor-core laminations laminate.

10, asymmetric groove shaped permanent synchronizing motor according to claim 7, one side what it is characterized in that described tri-angle-holed and permanent magnet position correspondence is arc, this arc limit is to triangle indent and armature spindle outer circumferential shape correspondence.

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