CN2497468Y

CN2497468Y - Built-in permanent-magnet motor rotor

Info

Publication number: CN2497468Y
Application number: CN 01263050
Authority: CN
Inventors: 朱明聪
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-09-26
Filing date: 2001-09-26
Publication date: 2002-06-26
Anticipated expiration: 2011-09-26

Abstract

The utility model discloses a built-in permanent-magnet motor rotor, which is provided with a plurality of axial magnet slots for the built-in permanent magnet. The magnet slot position forms a petal-shaped outer circular arc and an axis hole for assembling a central axis. The center of circle of the petal-shaped circular arc and the center of circle of the rotor form a potential difference R2. The radius of the circular arc R1 is smaller than the rotor radius R; meanwhile, R1+R2=R. The structure improves the magnetic field distribution in a motor air gap, which makes the magnetic field distribution approach to sine wave distribution, improves the absence of the oversized torque of suddenly rotating, and makes the motor winding construction simplified. An axial empty slot is arranged between the contiguous position of the magnet slot and the axis hole; thus the utility model has the function of preventing permanent magnet magnetic flux leakage between poles, the inertia of the motor rotor is reduced, and the set-up time and the idle current of the motor are reduced.

Description

The motor rotor of built-in permanent-magnet

Technical field

The utility model relates to a kind of motor rotor of built-in permanent-magnet.

Background technology

Commonly use the built-in permanent-magnet motor for improving cogging torque, that motor stator is adopted flume structure, or cooperate the angle that adopts pole-face to expand into non-integer groove number with number of stator slots, but the former is so that the coiling utmost point of motor is not easy enforcement, increase the difficulty of construction, the shape that the processing cost height of simultaneously skewed slot coiling and air-gap flux distribute is wayward, and the latter easily makes the pole-face expanded angle diminish, and directly reduces motor output and is difficult for being applied to the less stator of groove number.

Summary of the invention

Main purpose of the present utility model provides a kind of motor rotor of built-in permanent-magnet, to improve the Distribution of Magnetic Field in the motor air-gap, improves the excessive disappearance of cogging torque, and motor coiling construction is simplified.

Secondary objective of the present utility model provides a kind of motor rotor of built-in permanent-magnet, so that the permanent magnet leakage field effect between the utmost point and the utmost point that prevents to be provided, reduces simultaneously the inertia of motor rotor, reduces motor starting time and no-load current.

For reaching above-mentioned purpose, the technical solution of the utility model is as follows:

A kind of motor rotor of built-in permanent-magnet, have a plurality of for the built-in axial magnetic metal trough of permanent magnet, magnet groove position forms the external arc of lobe type and an axis hole of establishing for the axle group, wherein: the center of circle of this lobe type circular arc and the rotor center of circle form a potential difference R2, this arc radius R1 is less than rotor radius R, R1+R2=R provides lobe type circular arc the pole-face a kind of and skew of the rotor center of circle simultaneously.

Have an axial dead slot between above-mentioned magnet groove phase ortho position and axis hole, this dead slot forms a sharp type groove top in adjacent of magnet groove, and form between groove top and bottom land relative to expansion shape trough rim.

The utility model adopts the lobe type arc of circle pole-face with the rotor center skew, improve the Distribution of Magnetic Field in the motor air-gap, air-gap flux is distributed becomes approaching sinusoidal wave the distribution, and then improve the excessive disappearance of cogging torque, therefore motor stator of the present utility model need not adopt flume structure, motor coiling construction is simplified, and enforcement of the present utility model is also irrelevant with motor stator groove number, this lobe type circular arc outer rim, stronger motor electrode reaction resistivity also is provided, in addition because accurate SERVO CONTROL, the electric current of motor is to be sine-wave current, and air-gap flux distribution of the present utility model becomes approaching sinusoidal wave the distribution, can obtain uniform outputting torsion, quite is applicable to the application of elaborate servo control.

In addition, the utility model is offered axial dead slot between magnet groove phase ortho position and axis hole, prevents between the utmost point and the utmost point the effect of permanent magnet leakage field except providing, and can directly reduce the inertia of motor rotor simultaneously, reduces motor starting time and no-load current.

Description of drawings

Fig. 1 is outside drawing of the present utility model;

Fig. 2 is the end view drawing of Fig. 1;

Fig. 3 is the end view drawing between the utility model and stator arrangement;

Fig. 4 is the air gap flux density distribution map of Fig. 3;

Fig. 5 is the end view drawing of commonly using between built-in permanent-magnet rotor and stator arrangement;

Fig. 6 is the air gap flux density distribution map of Fig. 5;

Fig. 7 is the outside drawing that the utility model changes example;

Fig. 8 is the end view drawing that the utility model changes example.

Specific embodiment

Below in conjunction with accompanying drawing and concrete embodiment, the utility model is described in further detail.

Fig. 1, the 2nd, the outside drawing of the utility model embodiment one and end view drawing, this rotor 1 has the axis hole 3 that the built-in axle of a plurality of confession permanent magnets is established with magnet groove 2 and confession axle group, the utility model mainly forms the lobe type circular arc pole-face 11 with the skew of the rotor center of circle in magnet groove position, the moulding of this lobe type circular arc 11 is consisted of by radius centered by the center of circle 600 and take R1, wherein, the center of circle 600 is the potential differences that form R2 with the rotor center of circle 500, and arc radius R1 is less than rotor radius R, the tectonic relationship that has simultaneously R1+R2=R, so provide a kind of and form the lobe type circular arc pole-face 11 that is offset with the rotor center of circle, use the Distribution of Magnetic Field of improving in the motor air-gap, air-gap flux is distributed becomes approaching sinusoidal wave the distribution, and then improves the excessive disappearance of cogging torque.

Approach the sinusoidal wave structure that distributes about the utility model and can consult Fig. 3,4. Fig. 3 is the end view drawing between the utility model and stator 200 configurations, and the air gap flux density near sine wave that gives the energization excitation gained between configuration distributes (as shown in Figure 4). The air gap flux density of relatively practising all built-in permanent-magnet motors distributes such as Fig. 5,6, Fig. 5 shows that the pole-face external arc 101 commonly use rotor 100 is the isocentric circular arc that radius R was consisted of with rotor, gives the air gap flux density that energization excitation obtains between it disposes with stator 200 and is distributed as trapezoidal (such as Fig. 6). Obviously the utlity model has the air-gap flux distribution and become approaching sinusoidal wave the distribution, effectively improve cogging torque, also needn't be in order to reduce cogging torque, must not be the integral multiple of stator per tooth tooth section angle and guard every utmost point pole-face expanded angle rigidly, the every utmost point pole-face of the utility model expanded angle can be launched fully, simultaneously, the utility model more is applicable to the elaborate servo control of sine-wave current, and less running vibrations, certainly the utility model uses the lobe type circular arc outer rim that is offset with the rotor center of circle, it is thicker to make motor stator produce the air gap of facing in electrode reaction magnetic field, can weaken electrode reaction magnetic field, and better motor electrode reaction resistivity is provided.

Such as Fig. 1 and Fig. 2, the utility model is offered axial dead slot 5 in order to prevent the leakage field of the utmost point and interpolar permanent magnet in magnet groove 2 phase ortho positions and 3 of axis holes, and this dead slot 5 can directly reduce the inertia of motor rotor simultaneously, reduces motor starting time and no-load current; The dead slot 5 of illustrated example forms a sharp type groove top 51 in 2 adjacent of magnet grooves, use the leakage field that reduces every utmost point permanent magnet limit end, and form between groove top and bottom land relative to expansion shape trough rim 52, make the main magnetism guiding access of every utmost point permanent magnet not produce the saturated mechanical strength that is kept motor spindle to install, so so that prevent the dead slot 5 of the utmost point and interpolar permanent magnet leakage field, except having the utmost point of preventing and the effect of interpolar permanent magnet leakage field, do not affect the motor rotor Mechanical Structure Strength and do not causing under the saturated prerequisite of motor rotor magnetic circuit, having the inertia of motor rotor must reduce effect as far as possible.

Fig. 7,8 shows another variation example of using the utility model principle of uniformity to produce same effect, its center of circle 600 that consists of the lobe type external arc 11 of pole-face also forms the potential difference of R2 with the rotor center of circle 500, this arc radius R1 is also less than rotor radius R, and the proportionate relationship with R1+R2=R, simultaneously axially dead slot 5 also form form between sharp type groove top 51 and groove top and bottom land relative to expansion shape trough rim 52, principle is identical, and institute's produce an effect is also consistent.

The utility model and the motor rotor device of commonly using built-in permanent-magnet are compared as follows in architectural feature and effect:

Technology and architectural feature	The utility model	Commonly use product	Effect comparison and reason
Technology and architectural feature	The utility model	Commonly use product	Effect comparison and reason	Cogging torque	Little	Greatly	The utility model improves the motor air-gap magnetic flux distribution and becomes approaching sinusoidal wave the distribution; Commonly using the distribution of product air-gap flux is generally trapezoidal.
Every utmost point polar front shape	Lobe type circular arc outer rim with the skew of the rotor center of circle	Circular outer rim	The utility model can improve the motor air-gap magnetic flux distribution to be made to become and approaches sinusoidal wave the distribution.	Cogging torque	Little	Greatly
Every utmost point polar front shape		Circular outer rim		Every utmost point pole-face expanded angle	Launch fully	Can't launch fully	The product of commonly using must make every utmost point pole-face expanded angle not be the integral multiple of stator per tooth tooth section angle for its cogging torque is reduced; The utility model then needn't be like this.
Stator silicon steel plate	Do not need skewed slot	Essential skewed slot	The utility model motor stator need not adopt flume structure, makes motor coiling construction be simplified and make things convenient for automated production.	Every utmost point pole-face expanded angle	Launch fully	Can't launch fully
Stator silicon steel plate	Do not need skewed slot	Essential skewed slot		The resistivity of motor electrode reaction	Good	Poor	The utility model uses the lobe type circular arc outer rim with the skew of the rotor center of circle, and it is thicker to make motor stator produce the air gap of facing in electrode reaction magnetic field, can weaken electrode reaction magnetic field, so the utility model need not use too thick permanent magnet.

The minimizing mechanism of the utmost point and interpolar permanent magnet leakage field	Use a special axial dead slot that prevents the utmost point and interpolar permanent magnet leakage field	Use the limit rib of magnet storage tank	The utility model prevents the axial dead slot of the utmost point and interpolar permanent magnet leakage field, still has the effect that reduces motor rotor inertia.
		Use the limit rib of magnet storage tank		Be applied to the feasibility and enforcement effect of sine-wave current control	High	Low	The essential skewed stator slot that cooperates of the product of commonly using, so motor processing cost shape higher and that air-gap flux distributes is wayward; The utility model uses the lobe type circular arc outer rim with the skew of the rotor center of circle, and the adjustment of its side-play amount and circular arc outer rim radius obtains approaching sinusoidal wave distribution.
The running vibrations	Little	Greatly	Air-gap flux of the present utility model distributes and approaches sine wave; The air-gap flux of commonly using product is distributed as trapezoidal.		High	Low

In a word, the utility model need not the skewed stator slot structure so that the motor coiling is easy to implement, the accuracy of lobe type circular arc is easy to control simultaneously, make motor produce dress and simplified and make things convenient for automated production, its air-gap flux distributes to become and approaches sinusoidal wave the distribution, effectively improve the excessive disappearance of cogging torque, simultaneously enforcement of the present utility model is also irrelevant with motor stator groove number, every utmost point pole-face expanded angle can be launched fully, and the elaborate servo that is applicable to sine-wave current is controlled and less running vibrations, and lobe type circular arc outer rim, there is motor stator to produce electrode reaction magnetic field in the face of thicker air gap, stronger motor electrode reaction resistivity is provided, in addition, the axial dead slot of offering between magnetic turn trough phase ortho position and axis hole prevents the utmost point and the effect of interpolar permanent magnet except providing, can directly reduce simultaneously the inertia of motor rotor, so the utility model is that a kind of structure is novel, effect improves the type motor significantly.

Claims

1, the motor rotor of built-in permanent-magnet, have for the built-in axial magnetic metal trough of permanent magnet, magnet groove position forms the external arc of lobe type and an axis hole of establishing for the axle group, it is characterized in that: the center of circle of this lobe type circular arc and the rotor center of circle form a potential difference R2, this arc radius R1 is less than rotor radius R, R1+R2=R provides lobe type circular arc the pole-face a kind of and skew of the rotor center of circle simultaneously.

2, the motor rotor of built-in permanent-magnet as claimed in claim 1, it is characterized in that: have an axial dead slot between magnet groove phase ortho position and axis hole, this dead slot forms a sharp type groove top in adjacent of magnet groove, and form between groove top and bottom land relative to expansion shape trough rim.