CN102710043B - Permanent magnet motor rotor with excitation circuit variable reluctance and leakage flux path function - Google Patents

Permanent magnet motor rotor with excitation circuit variable reluctance and leakage flux path function Download PDF

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Publication number
CN102710043B
CN102710043B CN201210162161.1A CN201210162161A CN102710043B CN 102710043 B CN102710043 B CN 102710043B CN 201210162161 A CN201210162161 A CN 201210162161A CN 102710043 B CN102710043 B CN 102710043B
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China
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permanent magnet
magnetic
rotor core
groove
main permanent
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CN201210162161.1A
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CN102710043A (en
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李春艳
寇宝泉
李春红
张立富
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Heilongjiang University
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Heilongjiang University
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Abstract

The invention discloses a permanent magnet motor rotor with an excitation circuit variable reluctance and leakage flux path function, which belongs to the technical field of the motor and solves the problem that in the weak magnet speed regulation technology of the traditional synchronous permanent magnet motor, the permanent magnet motor is difficult in weak magnet speed regulation because excitation can not be regulated. The permanent magnet motor rotor with the excitation circuit variable reluctance and leakage flux path function comprises a rotor iron core, 2n main permanent magnets and 2n weak magnet units, wherein n is a positive integer; 2n trough slots are arranged along the axial direction of the rotor iron core and are evenly distributed along the peripheral direction of the rotor iron core; one main permanent magnet with a shape matched with the shape of each through slot is respectively embedded in each trough; a weak magnet unit is arranged between every two adjacent main permanent magnets along the peripheral direction of the rotor iron core; magnetic isolation grooves are arranged among two ends of the main permanent magnets along the peripheral direction and the adjacent weak magnet units; the main permanent magnet adopts radial magnetization; and the magnetization directions of the adjacent main permanent magnets are opposite. The invention is suitable for the permanent magnet motor.

Description

There is the permanent magnet machine rotor that energized circuit becomes magnetic resistance and leakage path function
Technical field
The present invention relates to a kind of permanent magnet machine rotor that energized circuit becomes magnetic resistance and leakage path function that has, belong to technical field of motors.
Background technology
The excitation of permagnetic synchronous motor is unadjustable, while moving more than base speed, must carry out weak magnetic control system.In conventional method, by increasing negative d-axis demagnetizing current, utilize the demagnetizing effect of armature reaction to make motor gas-gap field weakening, be equivalent to and directly weaken the object that excitation field reaches weak magnetic speedup.The method of this weak magnetic speedup can cause the electric current of motor to increase, and system effectiveness is reduced, and this has limited the range of application of permagnetic synchronous motor.In addition, in permagnetic synchronous motor, degaussing effect is relevant with d-axis inductance value, and d-axis inductance is larger, and the demagnetizing effect of armature reaction is stronger, and weak magnetic effect is better.But in the magneto of traditional structure, permanent magnet is connected in d-axis magnetic circuit, and permanent magnet magnetic conductance is little, and d-axis inductance is less, therefore, in permagnetic synchronous motor, adopt the weak magnetic effect of above-mentioned weak magnetism method unsatisfactory.As shown in Figure 5, its permanent magnet directly embeds in rotor core groove the permanent-magnetic synchronous motor rotor of traditional structure, and permanent magnet adopts radial magnetizing, is arranged at magnet isolation tank between permanent magnet and can be used for preventing interelectrode magnetic leakage.
Summary of the invention
The present invention is in order to solve in the weak-magnetic speed-regulating technology of existing permagnetic synchronous motor, and the problem that the weak-magnetic speed-regulating that magneto causes because excitation is unadjustable has difficulties provides a kind of permanent magnet machine rotor that energized circuit becomes magnetic resistance and leakage path function that has.
The permanent magnet machine rotor with energized circuit change magnetic resistance and leakage path function of the present invention, it comprises rotor core, and it also comprises 2n main permanent magnet and 2n weak magnetic cell, and n is positive integer,
Along rotor core axially have a 2n groove, 2n groove is uniformly distributed along the circumferencial direction of rotor core, embeds the main permanent magnet that a shape matches in each groove,
In rotor core, along the circumferential direction between every adjacent two main permanent magnets, a weak magnetic cell is set, between two ends along the circumferential direction of main permanent magnet and adjacent weak magnetic cell, is provided with magnet isolation tank;
Main permanent magnet adopts radial magnetizing, and the magnetizing direction of adjacent main permanent magnet is contrary.
Each weak magnetic cell comprises sliding-rail groove, spring, auxiliary permanent magnet, magnetic inductive block and two non-magnetic grooves,
Between two main permanent magnets of sliding-rail groove in rotor core, be radially and arrange, spring, auxiliary permanent magnet and magnetic inductive block radially ecto-entad are arranged and are arranged in sliding-rail groove, the stiff end of spring is fixedly connected with the bottom land of sliding-rail groove, the free end of spring is fixedly connected with one end of auxiliary permanent magnet, and the other end of auxiliary permanent magnet is fixedly connected with magnetic inductive block; The radical length of magnetic inductive block is identical with the radial width of magnet isolation tank;
Both sides along sliding-rail groove circumferencial direction in rotor core have a non-magnetic groove, the fluting direction of non-magnetic groove is parallel with sliding-rail groove, and non-magnetic groove is corresponding to the residing radial position of sliding-rail groove inner spring, it is equal in length that the radical length of non-magnetic groove and spring extend naturally, and two non-magnetic grooves are mirror symmetry in the both sides of sliding-rail groove;
When rotor core moves in base speed and below base speed, magnetic inductive block is between the magnet isolation tank of adjacent two main permanent magnets;
Auxiliary permanent magnet adopts cutting orientation magnetizing, and when rotor core moves more than base speed, spring is in compressive state, and auxiliary permanent magnet and magnetic inductive block radially outwards move, and the magnetic flux that winner's permanent magnet is sent is inner closed in rotor core through magnetic inductive block.
Weak magnetic cell also comprises two non-magnetic, and each non-magnetic is embedded in a non-magnetic groove.
Described main permanent magnet is V font, and the opening of the main permanent magnet of V font is towards the rotor shaft direction of rotor core.
Described main permanent magnet is tile shape, and the radian of the main permanent magnet of tile shape extends to the rotor shaft direction of rotor core.
Described main permanent magnet is plate shaped.
Described main permanent magnet is along the circumferential direction divided into a plurality of segmentations, is provided with magnetic bridge between adjacent sectional.
Advantage of the present invention is: in the present invention, auxiliary permanent magnet and magnetic inductive block are done as a wholely, and it is the acting in conjunction of magnetic field force induced, centrifugal force and frictional force mainly.When motor moves in base speed and below base speed, auxiliary permanent magnet and magnetic inductive block are more than or equal to centrifugal force at the magnetic field force being subject in the radial direction and frictional force sum, now auxiliary permanent magnet and magnetic inductive block transfixion.Magnetic inductive block is arranged in the position that sliding-rail groove both sides are blocked by the magnet isolation tank of adjacent main permanent magnet, and the interelectrode magnetic leakage of main permanent magnet is very little.Auxiliary permanent magnet is arranged in the position that sliding-rail groove both sides are rotor core, and auxiliary permanent magnet is identical with main permanent magnet polarity, and motor is encouraged jointly by main permanent magnet and auxiliary permanent magnet, thus base speed and base speed while moving below the output torque of electric system large.When electric system moves more than base speed, the centrifugal force that auxiliary permanent magnet and magnetic inductive block are subject to is greater than magnetic field force and frictional force sum, auxiliary permanent magnet and magnetic inductive block can not keep balance, beginning is moved to rotor core excircle direction along sliding-rail groove, until while reaching stress balance, auxiliary permanent magnet and magnetic inductive block be static operates in equilbrium position new in sliding-rail groove.Now auxiliary permanent magnet moves to its both sides in sliding-rail groove non-magnetic position of blocking, and the magnetic resistance of non-magnetic is very large, and it is large that the energized circuit magnetic resistance of auxiliary permanent magnet becomes, and the useful flux that offers air gap reduces; Magnetic inductive block moves to the position that in sliding-rail groove, both sides are rotor core, and magnetic inductive block magnetic resistance is very little, and the magnetic flux that main permanent magnet sends is closed through magnetic inductive block, and it is large that the leakage field of main permanent magnet becomes, and the useful flux that offers air gap reduces.Under the double action that auxiliary permanent magnet excitation loop magnetic resistance increases and main permanent magnet excitation loop leakage field increases, air-gap flux greatly reduces, and has therefore realized automatic weak-magnetic.Electric system speed is higher, and centrifugal force is larger, and auxiliary permanent magnet moves to both sides in sliding-rail groove has the part of non-magnetic position of blocking more, and auxiliary permanent magnet excitation loop magnetic resistance is larger; It is that the part of rotor core position is more that magnetic inductive block moves to both sides in sliding-rail groove, and main permanent magnet excitation loop leakage field is larger; Therefore air-gap flux is less, weak magnetic effect is better.
Rotor structure of the present invention is used in electric system, and when electric system moves below base speed, air-gap flux is encouraged jointly by main permanent magnet and auxiliary permanent magnet, the output torque that therefore can improve low speed; When electric system moves more than base speed, under the double action that auxiliary permanent magnet excitation loop magnetic resistance increases and main permanent magnet excitation loop leakage field increases, can cause air-gap flux to reduce, therefore can realize weak magnetic, the range of speeds while improving high-speed cruising.It needn't adopt the weak magnetism method of tradition that passes into negative direct-axis current, therefore do not increase copper loss, and magnetic is close lowly causes low iron loss, thus motor base speed while moving above efficiency high.The power of air-gap field of the present invention is relevant with the position of magnetic inductive block in sliding-rail groove with auxiliary permanent magnet.Auxiliary permanent magnet and magnetic inductive block are the closer to rotor periphery in sliding-rail groove, and air-gap field is just more weak, thereby can make motor along with the variation of rotor speed realizes automatic weak-magnetic, can obtain high electric efficiency and wide speed adjustable range.
Accompanying drawing explanation
Fig. 1 is the structural representation of execution mode six;
Fig. 2 is the partial structurtes schematic diagram of Fig. 1;
Fig. 3 is the structural representation of execution mode four;
Fig. 4 is the structural representation of execution mode seven;
Fig. 5 is the permanent-magnetic synchronous motor rotor structural representation of traditional structure.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1 to Fig. 4, described in present embodiment, have the permanent magnet machine rotor that energized circuit becomes magnetic resistance and leakage path function, it comprises rotor core 1, and it also comprises 2n main permanent magnet 2 and 2n weak magnetic cell 3, n is positive integer
Along rotor core 1 axially have a 2n groove, 2n groove is uniformly distributed along the circumferencial direction of rotor core 1, embeds the main permanent magnet 2 that a shape matches in each groove,
In rotor core 1, along the circumferential direction between every adjacent two main permanent magnets 2, a weak magnetic cell 3 is set, between two ends along the circumferential direction of main permanent magnet 2 and adjacent weak magnetic cell 3, is provided with magnet isolation tank 2-1;
Main permanent magnet 2 adopts radial magnetizing, and the magnetizing direction of adjacent main permanent magnet 2 is contrary.
Described in present embodiment, rotor core 1 is cylindrical shape,
Embodiment two: present embodiment is described below in conjunction with Fig. 1 to Fig. 4, present embodiment is further illustrating execution mode one, each weak magnetic cell 3 comprises sliding-rail groove 3-1, spring 3-2, auxiliary permanent magnet 3-3, magnetic inductive block 3-4 and two non-magnetic grooves
Between two main permanent magnets 2 of sliding-rail groove 3-1 in rotor core 1, be radially and arrange, spring 3-2, auxiliary permanent magnet 3-3 and magnetic inductive block 3-4 radially ecto-entad arrange and are arranged in sliding-rail groove 3-1, the stiff end of spring 3-2 is fixedly connected with the bottom land of sliding-rail groove 3-1, the free end of spring 3-2 is fixedly connected with one end of auxiliary permanent magnet 3-3, and the other end of auxiliary permanent magnet 3-3 is fixedly connected with magnetic inductive block 3-4; The radical length of magnetic inductive block 3-4 is identical with the radial width of magnet isolation tank 2-1;
Both sides along sliding-rail groove 3-1 circumferencial direction in rotor core 1 have a non-magnetic groove, the fluting direction of non-magnetic groove is parallel with sliding-rail groove 3-1, and non-magnetic groove is corresponding to the residing radial position of sliding-rail groove 3-1 inner spring 3-2, it is equal in length that the radical length of non-magnetic groove and spring 3-2 extend naturally, and two non-magnetic grooves are mirror symmetry in the both sides of sliding-rail groove 3-1;
When rotor core 1 moves in base speed and below base speed, magnetic inductive block 3-4 is between the magnet isolation tank 2-1 of adjacent two main permanent magnets 2;
Auxiliary permanent magnet 3-3 adopts cutting orientation magnetizing, when rotor core 1 moves more than base speed, spring 3-2 is in compressive state, and auxiliary permanent magnet 3-3 and magnetic inductive block 3-4 radially outwards move, and the magnetic flux that winner's permanent magnet 2 is sent is inner closed in rotor core 1 through magnetic inductive block 3-4.
In present embodiment, non-magnetic groove is hollow groove, and inside is only full of air, because the magnetic resistance of air is very large, can reach non-magnetic effect, contributes to alleviate the weight of rotor core 1 simultaneously.
In present embodiment, when rotor core 1 moves in base speed and below base speed, auxiliary permanent magnet 3-3 is positioned at the position that both sides are not blocked by non-magnetic groove; When rotor core 1 moves more than base speed, auxiliary permanent magnet 3-3 is positioned at the position that both sides are blocked by non-magnetic groove, and magnetic inductive block 3-4 is positioned at the position that both sides are rotor core 1;
Magnetic inductive block 3-4 and auxiliary permanent magnet 3-3 do as a whole can moving in sliding-rail groove 3-1, and it presents state static or motion according to the movement velocity of rotor core.The outer surface of magnetic inductive block 3-4 and auxiliary permanent magnet 3-3 can fixing metal housing or support, for and its place groove between position fix.Between sliding-rail groove 3-1 and auxiliary permanent magnet 3-3 and magnetic inductive block 3-4, lubricant body or guiding mechanism can be set.
The radially bisector of sliding-rail groove 3-1 overlaps and is positioned on the radius of rotor core with the interpolar bisector between adjacent two main permanent magnets 2.Non-magnetic groove is positioned at the outer circumferential sides near rotor core.
Embodiment three: below in conjunction with Fig. 1 to Fig. 4, present embodiment is described, present embodiment is for to the further illustrating of execution mode two, and weak magnetic cell 3 also comprises two non-magnetic 3-5, and each non-magnetic 3-5 is embedded in a non-magnetic groove.
Non-magnetic 3-5 can be non-magnetic metallic object, and the shape of non-magnetic 3-5 can be set to as required rectangle, squarely has, triangle or trapezoidal.
When rotor core 1 place electric system moves in base speed and below base speed, magnetic inductive block 3-4 and auxiliary permanent magnet 3-3 is static does not move, the peak of the radial height of auxiliary permanent magnet 3-3 is lower than the non-magnetic 3-5 height of minimum point radially.Now, the auxiliary permanent magnet 3-3 in sliding-rail groove 3-1 is not subject to blocking of non-magnetic 3-5, and the magnetic resistance of auxiliary permanent magnet 3-3 energized circuit is little.Magnetic inductive block 3-4 in sliding-rail groove 3-1 is blocked by the magnet isolation tank 2-1 of both sides.The leakage field of main permanent magnet 2 is little, and auxiliary permanent magnet 3-3 is identical with main permanent magnet 2 polarity, so air-gap flux is large, and low speed torque increases.When electric system moves more than base speed, centrifugal force increase due to rotor core 1, magnetic inductive block 3-4 and auxiliary permanent magnet 3-3 move to new equilbrium position in sliding-rail groove 3-1, the minimum point of the radial height of magnetic inductive block 3-4 in sliding-rail groove 3-1 is higher than the peak of the radial height of magnet isolation tank 2-1, and the minimum point of the radial height of auxiliary permanent magnet 3-3 is not less than the minimum point of the radial height of non-magnetic 3-5.Now, the auxiliary permanent magnet 3-3 in sliding-rail groove 3-1 is subject to blocking of non-magnetic 3-5, and auxiliary permanent magnet 3-3 energized circuit magnetic resistance increases.The position that in sliding-rail groove 3-1, the both sides of magnetic inductive block 3-4 are rotor core, the magnetic flux that main permanent magnet 2 sends is inner closed in rotor core 1 through magnetic inductive block 3-4.Under the double action that auxiliary permanent magnet 3-3 energized circuit magnetic resistance increases and main permanent magnet 2 leakage fields increase, air-gap flux reduces, and has realized automatic weak-magnetic.This rotor structure can be used for motor, also can be used for generator.
Embodiment four: below in conjunction with Fig. 3, present embodiment is described, present embodiment is for to the further illustrating of execution mode one, two or three, and described main permanent magnet 2 is V font, and the opening of the main permanent magnet 2 of V font is towards the rotor shaft direction of rotor core 1.
When rotor core place electric system moves below base speed, the main permanent magnet 2 of V font can provide higher air gap flux density, improves the output torque of motor.
Embodiment five: present embodiment is for to the further illustrating of execution mode one, two or three, and described main permanent magnet 2 be tile shape, and the radian of the main permanent magnet 2 of tile shape is to the rotor shaft direction extension of rotor core 1.
Embodiment six: below in conjunction with Fig. 1 and Fig. 2, present embodiment is described, present embodiment is for to the further illustrating of execution mode one, two or three, and described main permanent magnet 2 is plate shaped.
The process structure of plate shaped main permanent magnet 2 simply, convenience magnetizes.
Embodiment seven: below in conjunction with Fig. 4, present embodiment is described, present embodiment is for to the further illustrating of execution mode six, and described main permanent magnet 2 is along the circumferential direction divided into a plurality of segmentations, is provided with magnetic bridge between adjacent sectional.
Main permanent magnet 2 structures described in present embodiment, rotor core 1 is due to the existence of magnetic bridge, and d-axis inductance is larger, and motor has higher desirable maximum speed.
The present invention is applicable in inner rotor core, outer-rotor structure or linear electric motors.

Claims (6)

1. have the permanent magnet machine rotor that energized circuit becomes magnetic resistance and leakage path function, it comprises rotor core (1), it is characterized in that: it also comprises 2n main permanent magnet (2) and 2n weak magnetic cell (3), and n is positive integer,
Along rotor core (1) axially have a 2n groove, 2n groove is uniformly distributed along the circumferencial direction of rotor core (1), embeds the main permanent magnet (2) that a shape matches in each groove,
In rotor core (1), along the circumferential direction between every adjacent two main permanent magnets (2), a weak magnetic cell (3) is set, between two ends along the circumferential direction of main permanent magnet (2) and adjacent weak magnetic cell (3), is provided with magnet isolation tank (2-1);
Main permanent magnet (2) adopts radial magnetizing, and the magnetizing direction of adjacent main permanent magnet (2) is contrary;
Each weak magnetic cell (3) comprises sliding-rail groove (3-1), spring (3-2), auxiliary permanent magnet (3-3), magnetic inductive block (3-4) and two non-magnetic grooves,
Between two main permanent magnets (2) of sliding-rail groove (3-1) in rotor core (1), be radially and arrange, spring (3-2), auxiliary permanent magnet (3-3) and magnetic inductive block (3-4) radially ecto-entad are arranged and are arranged in sliding-rail groove (3-1), the stiff end of spring (3-2) is fixedly connected with the bottom land of sliding-rail groove (3-1), the free end of spring (3-2) is fixedly connected with one end of auxiliary permanent magnet (3-3), and the other end of auxiliary permanent magnet (3-3) is fixedly connected with magnetic inductive block (3-4); The radical length of magnetic inductive block (3-4) is identical with the radial width of magnet isolation tank (2-1);
The upper both sides along sliding-rail groove (3-1) circumferencial direction of rotor core (1) have a non-magnetic groove, the fluting direction of non-magnetic groove is parallel with sliding-rail groove (3-1), and non-magnetic groove is corresponding to the residing radial position of sliding-rail groove (3-1) inner spring (3-2), it is equal in length that the radical length of non-magnetic groove and spring (3-2) extend naturally, and two non-magnetic grooves are mirror symmetry in the both sides of sliding-rail groove (3-1);
When rotor core (1) moves in base speed and below base speed, magnetic inductive block (3-4) is positioned between the magnet isolation tank (2-1) of adjacent two main permanent magnets (2);
Auxiliary permanent magnet (3-3) adopts cutting orientation magnetizing, when rotor core (1) moves more than base speed, spring (3-2) is in compressive state, auxiliary permanent magnet (3-3) and magnetic inductive block (3-4) radially outwards move, and the magnetic flux that winner's permanent magnet (2) is sent is inner closed in rotor core (1) through magnetic inductive block (3-4).
2. according to claim 1 have a permanent magnet machine rotor that energized circuit becomes magnetic resistance and leakage path function, it is characterized in that: weak magnetic cell (3) also comprises two non-magnetic (3-5), each non-magnetic (3-5) is embedded in a non-magnetic groove.
3. according to claim 1 and 2 have a permanent magnet machine rotor that energized circuit becomes magnetic resistance and leakage path function, it is characterized in that: described main permanent magnet (2) is V font, and the opening of the main permanent magnet of V font (2) is towards the rotor shaft direction of rotor core (1).
4. according to claim 1 and 2 have a permanent magnet machine rotor that energized circuit becomes magnetic resistance and leakage path function, it is characterized in that: described main permanent magnet (2) is tile shape, the radian of the main permanent magnet of tile shape (2) extends to the rotor shaft direction of rotor core (1).
5. the permanent magnet machine rotor with energized circuit change magnetic resistance and leakage path function according to claim 1 and 2, is characterized in that: described main permanent magnet (2) is for plate shaped.
6. the permanent magnet machine rotor with energized circuit change magnetic resistance and leakage path function according to claim 5, is characterized in that: described main permanent magnet (2) is along the circumferential direction divided into a plurality of segmentations, is provided with magnetic bridge between adjacent sectional.
CN201210162161.1A 2012-05-23 2012-05-23 Permanent magnet motor rotor with excitation circuit variable reluctance and leakage flux path function Expired - Fee Related CN102710043B (en)

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CN109756091A (en) * 2018-12-21 2019-05-14 武汉船用电力推进装置研究所(中国船舶重工集团公司第七一二研究所) A kind of weak magnetic speed-up magneto
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JP4877581B2 (en) * 2006-04-04 2012-02-15 株式会社安川電機 Permanent magnet motor
CN201352753Y (en) * 2008-11-25 2009-11-25 苏州工业园区和鑫电器有限公司 Novel internal permanent magnet synchronous motor
CN101783536A (en) * 2009-10-22 2010-07-21 上海海事大学 Automatic field-weakening method for built-in permanent magnet synchronous motor

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