CN201994743U

CN201994743U - Rotor structure of permanent magnet motor

Info

Publication number: CN201994743U
Application number: CN2010206720268U
Authority: CN
Inventors: 王鲁; 周冬艳
Original assignee: Shanghai Highly Group Co Ltd
Current assignee: Shanghai Highly Group Co Ltd
Priority date: 2010-04-06
Filing date: 2010-12-21
Publication date: 2011-09-28
Anticipated expiration: 2020-12-21

Abstract

The utility model discloses a rotor structure of a permanent magnet motor, which can reduce the reluctance difference and the magnetic leakage of a quadrature and direct axis magnetic circuit and comprises a rotating shaft and a rotor iron core, wherein a plurality of pairs of magnetic poles are uniformly arranged on the outer circumferential surface of the rotor iron core; a strip magnet groove which is perpendicular to the central line of the magnetic pole is arranged on the stator iron core, corresponding to the inner side of each magnetic pole; a permanent magnet is inserted into each magnet groove; magnetism isolating gas gaps which are communicated with the magnet groove are respectively arranged on the two ends of each magnet groove; a plurality of strip magnetic beam regulating grooves are arranged between each magnet groove and the external end plane of the corresponding magnetic pole and are perpendicular to the corresponding magnet groove or form an acute angle with the magnet groove; and a groove is respectively arranged between the two adjacent magnetic poles on the outer circumferential surface of the rotor iron core.

Description

A kind of rotor structure of permanent magnet motor

Technical field

The utility model relates to the structure of permanent magnet motor, is specifically related to a kind of rotor structure of permanent magnet motor.

Background technology

Permanent magnet motor is widely used in high-tech area and the daily life, and people are also constantly improving and improving the manufacturing process of permanent magnet motor performance and permanent magnet motor according to the difference of permanent magnet motor use occasion.

In the rotor manufacturing process of traditional permanent magnet motor, be limited by the factor of traditional design theory and conventional fabrication processes and material, the geometry of machinery profile that adopts and the ratio of some important mechanical dimensions are not quite reasonable, when Nd-Fe-B permanent magnet inserts in the rotor core, because the magnetic permeability of permanent magnet approaches the magnetic permeability of air, therefore cause the ac-dc axis magnetic circuit magnetic resistance of rotor to differ greatly (being that the motor salient pole is bigger), cause motor torque ripple bigger, noise is also bigger; In addition, the permanent magnet leakage field of this structure is more, and the utilance of permanent magnet is descended.

The utility model content

In order to overcome above-mentioned the deficiencies in the prior art, the utility model aims to provide a kind of rotor structure of permanent magnet motor, and it can reduce the magnetic resistance difference of rotor ac-dc axis magnetic circuit, and can effectively reduce the leakage field situation of rotor.

The technical scheme that realizes above-mentioned purpose is: a kind of rotor structure of permanent magnet motor, comprise rotating shaft and rotor core, be provided with some on the outer peripheral face of described rotor core in uniform way to magnetic pole, the magnet groove of a strip is all offered in the interior side of corresponding each magnetic pole on the described rotor core in the mode of vertical this pole center line, the permanent magnet of planting respectively in each magnet groove, the two ends of each magnet groove offer respectively one be communicated with it every magnetic air gap, and between the outer face of each magnet groove and corresponding described magnetic pole to offer several strip fluxs arrangement groove with the vertical or acutangulate mode of corresponding magnet groove; Between two adjacent magnetic poles, be respectively equipped with a groove on the outer peripheral face of described rotor core.

The rotor structure of above-mentioned permanent magnet motor, wherein: the two ends of each described groove respectively and close describedly be provided with every magnetic bridge between magnetic air gap.

The rotor structure of above-mentioned permanent magnet motor, wherein: the ratio of described width D with the width B of described magnet groove every magnetic bridge, promptly D/B is 0.1～0.5.

The rotor structure of above-mentioned permanent magnet motor, wherein: the distance H 1 between two relative described magnet grooves and the outer ratio through φ 3 of described rotor core, promptly H1/ φ 3 is 0.78～0.82.

The rotor structure of above-mentioned permanent magnet motor is characterized in that: the ratio of the width A of described flux arrangement groove and the width B of described magnet groove, promptly A/B is 0.6～0.7.

The rotor structure of above-mentioned permanent magnet motor, wherein: the ratio of the degree of depth C of described groove and the width B of described magnet groove, promptly C/B is 0.8～1.2.

The rotor structure of above-mentioned permanent magnet motor, wherein: radian E=(40～the 80)/P mechanical angle of described groove, P is the logarithm of described magnetic pole.

The rotor structure of above-mentioned permanent magnet motor, wherein: described permanent magnet is a NdFeB material.

Adopted the technical scheme of the rotor structure of permanent magnet motor of the present utility model,, reduced the magnetic resistance difference of ac-dc axis magnetic circuit in the rotor, promptly reduced the salient pole ratio, the torque pulsation of rotor has been reduced, thereby reduced noise by improving the shape of rotor core; The leakage field of permanent magnet is reduced, the magnetic flux of permanent magnet is utilized effectively, promoted the efficient of permanent magnet motor.

Description of drawings

Fig. 1 is the sectional view of the rotor structure of permanent magnet motor of the present utility model;

Fig. 2 is the partial section of the rotor structure of permanent magnet motor of the present utility model.

Embodiment

In order to understand the technical solution of the utility model better, also be described in detail in conjunction with the accompanying drawings below by specific embodiment.

See also Fig. 1 and Fig. 2, the rotor structure of a kind of permanent magnet motor of the present utility model comprises rotating shaft 5 and the rotor core 6 that is sleeved in the rotating shaft 5, wherein,

Uniform several fixing holes 7 on the end face of rotor core 6;

The polarity that is provided with some to magnetic pole 10, adjacent

magnetic pole

10A and 10B on the outer peripheral face of rotor core 6 in uniform way is opposite;

The magnet groove 11 of a strip is all offered in the interior side of corresponding each magnetic pole 10 on the rotor core 6 in the mode of vertical these magnetic pole 10 center lines, the distance H 1 between two relative magnet grooves 11 and the outer ratio of rotor core 6 through φ 3, promptly the best of H1/ φ 3 is set at 0.78～0.82; The permanent magnet 4 of planting respectively in each magnet groove 11, the polarity of adjacent two permanent magnets 4 is opposite, and this permanent magnet 4 is a NdFeB material; H1 is two spacings between the relative magnet 4, by rational placement permanent magnet 4 magnetic flux of permanent magnet 4 is utilized effectively;

The two ends of each magnet groove 11 offer respectively one be communicated with it every magnetic air gap 8; Because the magnetic permeability of air is very little, therefore the leakage field minimizing that can make permanent magnet 4 every magnetic air gap 8 is set;

Put groove 13 in order to offer several strip fluxs between the outer face of each magnet groove 11 and corresponding magnetic pole 10 with corresponding magnet groove 11 vertical or acutangulate modes, the ratio of the width A of flux arrangement groove 13 and the width B of magnet groove 11, promptly the best of A/B is set at 0.6～0.7; After adopting flux arrangement groove 13, the magnetic flux that permanent magnet 4 is produced effectively utilizes, and further reduces leakage field, the magnetic flux distribution of balanced permanent magnet 4, and the torque pulsation and the heating that reduce permanent magnet motor are uneven;

Between two adjacent

magnetic pole

10A and 10B, be respectively equipped with a groove 9 on the outer peripheral face of rotor core 6, radian E=(40～the 80)/P mechanical angle of groove 9, P is the logarithm of magnetic pole 10, the ratio of the degree of depth C of groove 9 and the width B of magnet groove 11, the best that is C/B is set at 0.8～1.2, this ratio also is the degree of depth of groove 9 and the ratio of the thickness of permanent magnet 4, makes the magneto resistive ratio of ac-dc axis magnetic circuit more approaching like this.

The two ends of each groove 9 respectively and close being provided with between magnetic air gap 8 every magnetic bridge 12 should be every the ratio of width D with the width B of magnet groove 11 of magnetic bridge 12, and promptly the best of D/B is set at 0.1～0.5.

Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the utility model, and be not to be used as qualification of the present utility model, as long as in connotation scope of the present utility model, all will drop in claims scope of the present utility model variation, the modification of the above embodiment.

Claims

1. the rotor structure of a permanent magnet motor, comprise rotating shaft and rotor core, be provided with some on the outer peripheral face of described rotor core in uniform way to magnetic pole, it is characterized in that: the magnet groove of a strip is all offered in the interior side of corresponding each magnetic pole on the described rotor core in the mode of vertical this pole center line, the permanent magnet of planting respectively in each magnet groove, the two ends of each magnet groove offer respectively one be communicated with it every magnetic air gap, and between the outer face of each magnet groove and corresponding described magnetic pole to offer several strip fluxs arrangement groove with the vertical or acutangulate mode of corresponding magnet groove; Between two adjacent magnetic poles, be respectively equipped with a groove on the outer peripheral face of described rotor core.

2. the rotor structure of permanent magnet motor according to claim 1 is characterized in that: the two ends of each described groove respectively and close describedly be provided with every magnetic bridge between magnetic air gap.

3. the rotor structure of a kind of permanent magnet motor according to claim 2 is characterized in that: the ratio of described width D with the width B of described magnet groove every magnetic bridge, promptly D/B is 0.1～0.5.

4. the rotor structure of permanent magnet motor according to claim 1 is characterized in that: the distance H 1 between two relative described magnet grooves and the outer ratio through φ 3 of described rotor core, promptly H1/ φ 3 is 0.78～0.82.

5. the rotor structure of permanent magnet motor according to claim 1 is characterized in that: the ratio of the width A of described flux arrangement groove and the width B of described magnet groove, promptly A/B is 0.6～0.7.

6. the rotor structure of a kind of permanent magnet motor according to claim 1 is characterized in that: the ratio of the degree of depth C of described groove and the width B of described magnet groove, promptly C/B is 0.8～1.2.

7. the rotor structure of permanent magnet motor according to claim 1, it is characterized in that: radian E=(40～the 80)/P mechanical angle of described groove, P is the logarithm of described magnetic pole.

8. the rotor structure of permanent magnet motor according to claim 1, it is characterized in that: described permanent magnet is a NdFeB material.