CN214045220U - Combined linear anti-demagnetization permanent magnet motor rotor - Google Patents
Combined linear anti-demagnetization permanent magnet motor rotor Download PDFInfo
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- CN214045220U CN214045220U CN202022916592.5U CN202022916592U CN214045220U CN 214045220 U CN214045220 U CN 214045220U CN 202022916592 U CN202022916592 U CN 202022916592U CN 214045220 U CN214045220 U CN 214045220U
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Abstract
The utility model provides a modular demagnetization permanent-magnet machine rotor is prevented to a style of calligraphy, relates to motor technical field, and this rotor includes rotor core, be equipped with a plurality of permanent magnet units on the rotor core, each permanent magnet unit is laid around rotor core's axle center symmetry, permanent magnet unit includes at least one style of calligraphy magnet steel combination, a style of calligraphy magnet steel combination comprises three magnet steel segmentation to this three magnet steel segmentation is laid into the style of calligraphy of perpendicular to d axle, and the magnet steel segmentation that is located the middle part wherein is middle part magnet steel segmentation, and two other magnet steel segmentations are the tip magnet steel segmentation, and the coercivity of middle part magnet steel segmentation is less than the coercivity of two tip magnet steel segmentations. The utility model provides a rotor, overload capacity is high.
Description
Technical Field
The utility model relates to an electric machine technology especially relates to a modular permanent-magnet machine rotor's technique of preventing demagnetization of style of calligraphy.
Background
The permanent magnet synchronous motor is widely applied to electric automobiles, the motor is one of the cores of an electric driving system, and the comprehensive performance of the motor directly influences the performance of the electric automobiles. At present, in the aspects of development of a Permanent Magnet Synchronous Motor (PMSM) with high overload capacity and demagnetization prevention for an electric automobile, the technical bottleneck exists, and the defects of hidden magnetic steel demagnetization danger, low overload capacity, slow response, low power density and torque density, poor reliability, reduced running performance and the like exist, so that the requirements are difficult to meet.
As shown in fig. 3, on a rotor core 101 of an existing linear permanent magnet synchronous motor, linear magnetic steels 102 are all single magnetic steels, the linear magnetic steels 102 and pole shoes (rotor cores) form permanent magnet poles, and an inter-pole region S of the rotor core 101 is an armature reaction demagnetization dangerous region; when no current passes through the armature winding, a magnetic field formed by the permanent magnetic poles is a main magnetic field, when current passes through the armature winding, the armature winding generates an armature magnetic field, the main magnetic field is distorted under the action of the armature magnetic field on the main magnetic field, armature reaction is generated, armature magnetomotive force is generated, and an air gap magnetic field between the stator and the rotor is distorted (namely, armature reaction); the armature reaction can cause the demagnetization of the magnetic steel when the existing linear motor rotor is loaded, particularly, the demagnetization and the magnetic field distortion at two ends of the magnetic steel are strong when the linear motor rotor is overloaded, and the armature reaction demagnetization dangerous area S is positioned at two ends of the magnetic steel, even can cause irreversible demagnetization at two ends, thereby causing the increase of the iron consumption and the copper consumption of the motor, the reduction of the efficiency, the increase of the temperature rise and the reduction of the safety performance, and therefore, the overload capacity of the existing linear motor rotor is poor.
SUMMERY OF THE UTILITY MODEL
To the defect that exists among the above-mentioned prior art, the utility model aims to solve the technical problem that a combination formula style of calligraphy that overload capacity is high is prevented demagnetization permanent-magnet machine rotor is provided.
In order to solve the technical problem, the utility model provides a modular permanent-magnet machine rotor that demagnetizes is prevented to a style of calligraphy, including rotor core, rotor core is last to be equipped with a plurality of permanent magnetism units, and each permanent magnetism unit is laid around rotor core's axial symmetry, its characterized in that:
the permanent magnet unit comprises at least one linear magnetic steel combination, the linear magnetic steel combination is composed of three magnetic steel sections, the three magnetic steel sections are distributed into a linear shape perpendicular to a d axis, the magnetic steel section positioned in the middle is a middle magnetic steel section, the other two magnetic steel sections are end magnetic steel sections, and the coercive force of the middle magnetic steel section is smaller than the coercive force of the two end magnetic steel sections.
Furthermore, two ends of the linear magnetic steel combination are provided with magnetism isolating grooves.
Furthermore, the magnetism isolating grooves at two ends of the linear magnetic steel combination are asymmetrically arranged relative to the d axis.
Furthermore, in the permanent magnet unit, two linear magnetic steels are combined, and the two linear magnetic steels are sequentially arranged along the radial direction of the rotor iron core from inside to outside.
The utility model provides a demagnetization permanent-magnet machine rotor is prevented to combination formula style of calligraphy, style of calligraphy magnet steel combination adopt syllogic structure, adopt the higher magnet steel segmentation of coercive force at style of calligraphy magnet steel combination both ends, and the magnet steel that the armature reaction arouses when can effectively restrain transshipping demagnetizes, improves the overload capacity and the overload multiple of motor.
Drawings
Fig. 1 is a schematic structural view of a combined linear demagnetization-preventing permanent magnet motor rotor according to a first embodiment of the present invention;
fig. 2 is a schematic structural view of a combined linear anti-demagnetization permanent magnet motor rotor according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a linear permanent magnet motor rotor.
Detailed Description
The following description will be made in detail with reference to the accompanying drawings, but the present embodiment is not intended to limit the present invention, and all similar structures and similar variations thereof adopted by the present invention should be included in the protection scope of the present invention, and the relations between the numbers of the components in the present invention are shown.
As shown in fig. 1, the utility model discloses a modular demagnetization permanent-magnet machine rotor is prevented to a style of calligraphy that first embodiment provided, including rotor core 10, rotor core 10 is last to be equipped with a plurality of permanent magnetism units, and each permanent magnetism unit is laid around rotor core's axle center symmetry, its characterized in that:
the permanent magnet unit comprises a linear magnetic steel combination, the linear magnetic steel combination is composed of three magnetic steel sections 11, 12 and 13, the three magnetic steel sections are arranged into a linear shape perpendicular to a d axis (magnetic pole axis), the magnetic steel section 11 positioned in the middle is a middle magnetic steel section, the other two magnetic steel sections 12 and 13 are end magnetic steel sections, and the coercive force (coercive force is a characteristic parameter index of a ferromagnetic material resisting a reverse magnetic field to demagnetize the ferromagnetic material) of the middle magnetic steel section 11 is smaller than the coercive force of the two end magnetic steel sections; two ends (a counterclockwise end and a clockwise end) of the linear magnetic steel combination are respectively provided with a magnetism isolating groove 14, 15, and the two magnetism isolating grooves 14, 15 are asymmetrically arranged relative to a d shaft (a magnetic pole axis).
The utility model discloses in the first embodiment, a style of calligraphy magnet steel combination constitutes permanent magnetic pole with pole shoe (rotor core), a style of calligraphy magnet steel combination adopts syllogic structure, adopt the higher magnet steel segmentation of coercive force at a style of calligraphy magnet steel combination both ends, the magnet steel that the armature reaction arouses when can effectively restrain transshipping demagnetizes, improve the overload capacity and the overload multiple of motor, overload capacity refers to the torque overload capacity under the constant speed, the overload multiple is the ratio of maximum output torque and rated output torque, the relative d axle asymmetry of magnetic isolation groove (non-magnetic flux barrier) of a style of calligraphy magnet steel combination both ends is laid, can obtain with stator core chute, adopt the same effect of processes such as inhomogeneous air gap and the complicated measure of structure between rotor permanent magnetic pole slant or the stator, can reduce the tooth's socket torque fluctuation.
As shown in fig. 2, the second embodiment of the present invention is similar to the first embodiment, the rotor core 20 of the second embodiment is also provided with a plurality of permanent magnet units, and each permanent magnet unit is also symmetrically arranged around the axis of the rotor core, and the permanent magnet unit also includes a linear magnetic steel combination;
the second embodiment of the present invention is different from the first embodiment in that two linear magnetic steel combinations are arranged in the permanent magnet unit of the second embodiment in sequence from inside to outside along the radial direction of the rotor core 20, and the structure of the linear magnetic steel combination is similar to that of the first embodiment;
the first linear magnetic steel combination consists of a middle magnetic steel section 21 and two end magnetic steel sections 22 and 23, the coercive force of the middle magnetic steel section 21 is also smaller than the coercive forces of the two end magnetic steel sections 22 and 23, and the two ends of the first linear magnetic steel combination are both provided with magnetism isolating grooves 24, but the two magnetism isolating grooves 24 are symmetrically distributed relative to a d axis (magnetic pole axis); the second linear magnetic steel combination consists of a middle magnetic steel section 25 and two end magnetic steel sections 26 and 27, the coercive force of the middle magnetic steel section 25 is also smaller than the coercive forces of the two end magnetic steel sections 26 and 27, and two ends of the second linear magnetic steel combination are also provided with magnetic isolation grooves 28, but the two magnetic isolation grooves 28 are symmetrically distributed relative to the d axis (magnetic pole axis).
The utility model discloses the second embodiment has increased a style of calligraphy magnet steel combination on the basis of first embodiment, can show to increase reluctance torque relatively first embodiment, improves motor salient pole rate and weak magnetism spread speed ability.
The utility model discloses in the first embodiment, the magnetic isolation groove at a style of calligraphy magnet steel combination both ends also can adopt the scheme that relative d axle (magnetic pole axis) symmetry was laid.
Claims (4)
1. The utility model provides a modular demagnetization permanent-magnet machine rotor is prevented to a style of calligraphy, includes rotor core, rotor core is last to be equipped with a plurality of permanent magnetism units, and each permanent magnetism unit lays its characterized in that around rotor core's axle center symmetry:
the permanent magnet unit comprises at least one linear magnetic steel combination, the linear magnetic steel combination is composed of three magnetic steel sections, the three magnetic steel sections are distributed into a linear shape perpendicular to a d axis, the magnetic steel section positioned in the middle is a middle magnetic steel section, the other two magnetic steel sections are end magnetic steel sections, and the coercive force of the middle magnetic steel section is smaller than the coercive force of the two end magnetic steel sections.
2. The combined linear anti-demagnetization permanent magnet motor rotor according to claim 1, wherein: and two ends of the linear magnetic steel combination are provided with magnetic isolation grooves.
3. The combined linear anti-demagnetization permanent magnet motor rotor according to claim 2, wherein: the magnetic isolation grooves at two ends of the linear magnetic steel combination are asymmetrically arranged relative to the d axis.
4. The combined linear anti-demagnetization permanent magnet motor rotor according to claim 1, wherein: in the permanent magnet unit, two linear magnetic steel combinations are arranged in sequence from inside to outside along the radial direction of the rotor iron core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022916592.5U CN214045220U (en) | 2020-12-08 | 2020-12-08 | Combined linear anti-demagnetization permanent magnet motor rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022916592.5U CN214045220U (en) | 2020-12-08 | 2020-12-08 | Combined linear anti-demagnetization permanent magnet motor rotor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214045220U true CN214045220U (en) | 2021-08-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022916592.5U Active CN214045220U (en) | 2020-12-08 | 2020-12-08 | Combined linear anti-demagnetization permanent magnet motor rotor |
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| Country | Link |
|---|---|
| CN (1) | CN214045220U (en) |
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2020
- 2020-12-08 CN CN202022916592.5U patent/CN214045220U/en active Active
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