CN105391265B - A kind of composite excitation fault-tolerant motor system of brushless harmonic exitation - Google Patents

A kind of composite excitation fault-tolerant motor system of brushless harmonic exitation Download PDF

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Publication number
CN105391265B
CN105391265B CN201510964408.5A CN201510964408A CN105391265B CN 105391265 B CN105391265 B CN 105391265B CN 201510964408 A CN201510964408 A CN 201510964408A CN 105391265 B CN105391265 B CN 105391265B
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CN
China
Prior art keywords
winding
rotor
fault
harmonic
motor
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CN201510964408.5A
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Chinese (zh)
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CN105391265A (en
Inventor
樊英
张丽
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东南大学
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K21/00Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/27Rotor cores with permanent magnets
    • H02K1/2706Inner rotor
    • H02K1/272Inner rotor where the magnetisation axis of the magnets is radial or tangential
    • H02K1/274Inner rotor where the magnetisation axis of the magnets is radial or tangential consisting of a plurality of circumferentially positioned magnets
    • H02K1/2753Inner rotor where the magnetisation axis of the magnets is radial or tangential consisting of a plurality of circumferentially positioned magnets consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276Magnets embedded in the magnetic core
    • H02K1/2766Magnets embedded in the magnetic core having a flux concentration effect
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K21/00Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/02Details
    • H02K21/04Windings on magnets for additional excitation ; Windings and magnets for additional excitation
    • H02K21/042Windings on magnets for additional excitation ; Windings and magnets for additional excitation with permanent magnets and field winding both rotating

Abstract

The invention discloses a kind of composite excitation fault-tolerant motor system of brushless harmonic exitation, by adding harmonic winding (8);Exciting Windings for Transverse Differential Protection harmony wave winding is sleeved in rotor slot, and is concentratred winding;Excitation winding pole coil is connected from beginning to end successively, forms electricity excitation magnetic field;The harmonic winding in two rotor slots diametrically is connected into a phase;It is connected after each phase harmonic winding is in parallel by rectification circuit with Exciting Windings for Transverse Differential Protection, is powered for Exciting Windings for Transverse Differential Protection.The electric system of the present invention increases Exciting Windings for Transverse Differential Protection harmony wave winding and rectifier, saves brush and slip ring on rotor structure, is advantageous to further improve the reliability and power density of motor.The permanent magnet in rotor is set in " V " type simultaneously, the existing radial magnetizing of permanent magnet, there is cutting orientation magnetizing again, active set has suffered magnetic flux, improves the output of motor, while has the advantages such as speed-regulating range width, power density and efficiency height.

Description

A kind of composite excitation fault-tolerant motor system of brushless harmonic exitation

Technical field

The present invention relates to a kind of motor, more particularly to a kind of composite excitation fault-tolerant motor based on brushless harmonic exitation.

Background technology

Rotor permanent magnet type internal permanent magnet synchronous motor has big torque output, speed-regulating range width, power density and efficiency The advantages that high, it is widely used in many high-grade drives fields.And in New-energy electric vehicle, wind-power electricity generation and boat The high performance Qu Donglingyu such as empty space flight, all proposes very high requirement to the reliability of drive system.But it is traditional it is built-in forever There are still the problem of fault freedom difference, can not meet system reliability requirement for magnetic-synchro motor.In order to overcome this shortcoming, state Inside and outside some experts and scholar propose fault-tolerant motor, the motor can realize motor circuit between phase and phase, magnetic circuit and The isolation in temperature field, improve the fault-tolerant operation ability of motor.But the excitation field of the motor is produced by permanent magnet, can not realize Regulation to air-gap field.Mixed excitation electric machine is due to that can efficiently solve such problem and by the green grass or young crops of domestic and international researcher Look at.At present, for the mixed excitation electric machine of rotor permanent magnet type, the position according to where Exciting Windings for Transverse Differential Protection, Exciting Windings for Transverse Differential Protection can be divided into and existed Stationary part and Exciting Windings for Transverse Differential Protection are in the class of rotor portion two.First kind motor is without brush and slip ring, and reliability is high, but electric machine structure Complexity, there is additional air gap, existing radial flux has axial magnetic flux again, and power density and efficiency are low;Second class electric machine structure It is fairly simple, but due to Exciting Windings for Transverse Differential Protection on rotor, it is necessary to by external power supply for direct current, it is necessary to which brush and slip ring, unfavorable In the highly reliable operation of motor.To solve the above problems, it is necessary that developing a kind of mixing based on brushless harmonic exitation encourages Magnetic-capacity mistake electric system, to meet drive system to motor high efficiency, strong fault tolerance, requirement easy to process and brushless.

The content of the invention

For above-mentioned prior art and its deficiency, the present invention proposes that a kind of composite excitation based on brushless harmonic exitation is fault-tolerant Electric system, solve fault-tolerant operation poor performance present in conventional internal formula permagnetic synchronous motor, permanent magnet demagnetization and Excitation Adjustment Difficult problem is saved, while improves the efficiency and torque density of motor, and non-brushing can be realized, ensures the highly reliable of motor Operation.

To achieve the above object, the technical solution adopted by the present invention is:

Compared with prior art, the invention has the advantages that:

(1) permanent magnet in rotor is set in " V " type, and the existing radial magnetizing of permanent magnet has a cutting orientation magnetizing again, in active set Magnetic flux, improves the output of motor, while have the advantages such as speed-regulating range width, power density and efficiency height;

(2) using higher hamonic wave cutting harmonic winding to produce induced electromotive force, then by diode rectifier circuit rectification, Give Exciting Windings for Transverse Differential Protection power supply, it is not necessary to brush and collector ring, and AC excitation motor, it is simple in construction, reliability is high;

(3) in Exciting Windings for Transverse Differential Protection installation rotor slot, in the absence of axial magnetic circuit and additional air gap, the Gao Gong of magneto is maintained Rate density and high efficiency;

(4) armature winding on stator is centralized winding, and end is short, is easily installed, without the fault-tolerant teeth conduct of winding Flux circuit, while circuit, magnetic circuit and the isolation in temperature field of motor between phase and phase are realized, improve the reliability of motor With fault-tolerant operation ability;

(5) redundancy electrical excitation is used, when loss of excitation failure occurs for permanent magnet, excitation caused by electrical excitation winding can be passed through Magnetic field, motor operating is maintained, improve the fault-tolerant ability of motor.

Brief description of the drawings

Fig. 1 is electric machine structure schematic diagram of the present invention;

Wherein:1 stator, 2 rotors, 3 permanent magnets, 4 armature tooths, 5 fault-tolerant teeths, 6 armature winding, 7 Exciting Windings for Transverse Differential Protection, 8 harmonic waves around Group.

Fig. 2 is the schematic diagram of the kind of air-gap design such as not;

Wherein:ω is rotor velocity, RsFor stator inside radius, RrFor rotor outer radius, h is centrifugation height.

Fig. 3 is air gap flux density frequency analysis when armature winding is passed through five cross streams electric currents.

Fig. 4 is the circuit structure block diagram of the composite excitation fault-tolerant motor system of the brushless harmonic exitation of the present invention.

Fig. 5 is rotor harmonic winding connected mode of the present invention.

Fig. 6 is rotor field coil connected mode of the present invention.

Embodiment

Technical scheme is described in detail below in conjunction with the accompanying drawings:

Excitation fault-tolerant motor, including stator 1, rotor five are mixed based on brushless harmonic exitation to be a kind of as shown in Figure 1 2nd, the harmonious wave winding 8 of permanent magnet 3, armature tooth 4, fault-tolerant teeth 5, armature winding 6, Exciting Windings for Transverse Differential Protection 7.Armature tooth 4 and fault-tolerant teeth 5 are along calmly 1 inner ring is circumferentially-spaced is uniformly distributed for son, and total number of teeth is 2m multiple (m is the number of phases of motor), and the facewidth and appearance of armature tooth 4 The facewidth of side set 5 is unequal.Armature winding 6 is wound with armature tooth 4, is individual layer concentratred winding, two adjacent individual layer concentratred windings Between isolated by fault-tolerant teeth 5, alternate Magnetic isolation, physical isolation are played while flux circuit is provided, be thermally isolated and The effect of electrical isolation, fundamentally avoids phase fault, has higher reliability and the ability that operates with failure, reduces Torque pulsation.Permanent magnet 3 is embedded in rotor 2, and shape is in " V " type, so existing radial magnetizing of permanent magnet, there is cutting orientation magnetizing again, Active set has suffered magnetic flux, can improve the torsion of motor.The number of pole-pairs of total number of teeth of armature tooth 4 and fault-tolerant teeth 5 and permanent magnet 3 it Difference is ± 2.The harmonious wave winding 8 of Exciting Windings for Transverse Differential Protection 7 is sleeved in rotor slot, and is concentratred winding, and harmonic winding 8 passes through diode Rectification circuit is connected with Exciting Windings for Transverse Differential Protection 7;The coil of Exciting Windings for Transverse Differential Protection 7 is connected from beginning to end successively;All permanent magnets 3 form permanent magnetic field, institute There is magnet exciting coil to form electricity excitation magnetic field.

Distance is Unequal distance between the inner periphery of stator 1 and the excircle of rotor 2.In the present invention, the armature on stator 1 The inner periphery radian of tooth 4 and fault-tolerant teeth 5 is big compared with the excircle radian of rotor 2.As shown in Fig. 2 the inside radius of stator 1 is than turning The outer radius of son 2 is big;Distance is h between the Inner arc center of circle of stator 1 and the external arc center of circle of rotor 2 simultaneously, is defined as centrifuging Highly.So result in the non-uniform air-gap between rotor 2 and stator 1.Along the direction of rotor rotate counterclockwise, a cycle Interior, gas length becomes maximum value from minimum value.Therefore, armature field can weaken in air gap larger part, while smaller in air gap Place is compensated.So as to which air gap flux density distortion and torque pulsation can be suppressed well.By optimizing centrifugation height h and electricity Armature tooth and the fault-tolerant teeth facewidth, it can make it that back-emf distortion and torque pulsation are minimum.When armature winding is passed through five cross streams electric currents When, air gap flux density is as shown in figure 3, be primarily present 9 times and 11 subharmonic.

When motor operation base speed is following, permanent magnet works independently, and only exists permanent magnetic field;When motor operation in base speed with When upper, harmonic winding accesses, and permanent magnet and Exciting Windings for Transverse Differential Protection collective effect, realizes the regulation to permanent magnetic field.Utilize uneven gas Gap and the stator facewidth such as not, optimize air gap flux density, it is only existed certain higher hamonic wave, utilize higher hamonic wave cutting harmonic winding To produce induced electromotive force, then by diode rectifier circuit rectification, give Exciting Windings for Transverse Differential Protection power supply, magnetic caused by DC excitation winding Field is equal with permanent magnetic field number of poles, realizes the regulation to air-gap field.When demagnetization failure occurs for permanent magnet, harmonic winding connects Enter, again may be by excitation field caused by electrical excitation winding, maintain motor operating, improve the fault-tolerant ability of motor.

The operation principle of the present invention is as follows:The motor produces main magnetic jointly by permanent magnet excitation and two kinds of excitation sources of electrical excitation , in both magnetic potential sources, permanent magnet sources are main magnetic potential source, and electrical excitation magnetic potential is as auxiliary magnetic potential source.When motor operation is in base When fast following, rotor windings do not work, permanent magnet independent role.When motor operation is in the base speed above, rotor windings and permanent magnetism Body cooperation, harmonic winding 8 is cut using the higher hamonic wave in air gap flux density to produce induced electromotive force, then by diode Rectifier circuit rectifies, magnetic field is equal with permanent magnetic field number of poles caused by DC excitation winding, realizes the regulation to permanent magnetic field.

The present invention harmonic winding produce induced harmonics electromotive force principle be:

It is illustrated in figure 3 air gap flux density frequency analysis when armature winding is passed through five cross streams electric currents, as seen from the figure, air gap The higher hamonic wave being primarily present during magnetic is close is 9 times and 11 times, wherein, work harmonic wave based on 9 subharmonic, for producing torque, and 11 subharmonic are used for excitation winding.The circuit structure block diagram of the composite excitation fault-tolerant motor system of brushless harmonic exitation is as schemed Shown in 4, external power supply device is powered to armature winding, 11 subharmonic in air gap, the harmonic winding production installed on cutting rotor Raw induced electromotive force, the rectified circuit rectifies of induced potential are powered into direct current to Exciting Windings for Transverse Differential Protection.Tradition is thus eliminated to encourage The brush and slip ring of mixed excitation electric machine of the magnetic winding on rotor.The connected mode of harmonic winding is as shown in figure 4, diametrically Two rotor slots in harmonic winding be connected into a phase.Nine phase harmonic windings are connected by rectification circuit with Exciting Windings for Transverse Differential Protection, excitation As shown in figure 5, excitation winding pole coil is connected from beginning to end successively, concrete reason is analyzed as follows winding connection:

The rotary speed of higher hamonic wave is different from fundamental wave synchronous rotational speed, similar with asynchronous machine, the revolutional slip of υ subharmonic For:

Wherein,υωSS/ υ, ωSFor stator electric angle frequency;ωRFor rotor field electric angle frequency;S is not use harmonic wave Revolutional slip before,

When rotor polar distance is equal, the sensing magnetic linkage of single turn Exciting Windings for Transverse Differential Protection is:

Wherein,Magnetic for υ subharmonic is close,υξψFor the coupling factor of υ subharmonic and rotor field coil, l is armature shaft To length, τ is rotor polar distance.

Wherein, PRFor rotor number of pole-pairs.

When excitation winding pole coil is connected, according to formula (2), the sensing magnetic linkage in k-th of coil is:

From formula (4) and Fig. 6, Exciting Windings for Transverse Differential Protection sensing magnetic linkage summation is:

Solution formula (5), the sensing magnetic linkage for obtaining rotor field coil are:

υ=(2g-1) PRG=1,2,3 ...

From formula (6) and (7) as can be seen that when all excitation winding pole coil series connection, work is only existed in rotor windings Make harmonic wave, although inoperative harmonic wave (υ ≠ (2g-1) P in each coil of rotor be presentR), but when they connect, this A little harmonic waves can cancel out each other in magnetic linkage is sensed.

Therefore, caused induced electromotive force passes through diode rectifier circuit rectification, the production of DC excitation winding in harmonic winding Raw magnetic field is equal with permanent magnetic field number of poles, realizes the regulation to permanent magnetic field.

Electric system of the present invention, remained in structure and performance conventional internal formula permagnetic synchronous motor torque output it is big, The advantages such as speed-regulating range width, power density and efficiency height;On excitation mode, employ permanent magnet excitation and two kinds of electrical excitation is encouraged Magnetic mode, solve permanent magnet demagnetization and adjustment of field excitation difficult problem;On stator structure, armature winding is concentrated using individual layer, can Improve the fault freedom of motor;On rotor structure, increase Exciting Windings for Transverse Differential Protection harmony wave winding and rectifier, save brush and cunning Ring, be advantageous to further improve the reliability and power density of motor.

Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should It is considered as protection scope of the present invention.

Claims (4)

1. a kind of composite excitation fault-tolerant motor system of brushless harmonic exitation, including stator (1), rotor (2), permanent magnet (3), electricity Armature tooth (4), fault-tolerant teeth (5), armature winding (6), Exciting Windings for Transverse Differential Protection (7);The armature tooth (4) and the fault-tolerant teeth (5) are along described Stator (1) inner ring is circumferentially-spaced to be uniformly distributed, and the facewidth of the armature tooth (4) and the facewidth of the fault-tolerant teeth (5) not phase Deng;Be wound with the armature winding (6) of individual layer concentratred winding on the armature tooth (4), between two adjacent individual layer concentratred windings by The fault-tolerant teeth (5) is isolated;In the embedded rotor (2) of the permanent magnet (3), all permanent magnets (3) form permanent-magnet magnetic ;It is characterized in that:Also include harmonic winding (8);The Exciting Windings for Transverse Differential Protection (7) and the harmonic winding (8) are sleeved on rotor slot In, and be concentratred winding;Exciting Windings for Transverse Differential Protection (7) coil is connected from beginning to end successively, forms electricity excitation magnetic field;Diametrically two The harmonic winding (8) in rotor slot is connected into a phase;After harmonic winding (8) described in each phase is in parallel by rectification circuit with The Exciting Windings for Transverse Differential Protection (7) is connected;Distance is Unequal distance between the stator (1) and the rotor (2).
2. the composite excitation fault-tolerant motor system of brushless harmonic exitation according to claim 1, it is characterised in that:It is described fixed The excircle radian of rotor (2) is big described in the inner periphery camber ratio of sub (1).
3. the composite excitation fault-tolerant motor system of brushless harmonic exitation according to claim 1, it is characterised in that:The electricity Total number of teeth of armature tooth (4) and the fault-tolerant teeth (5) is 2m multiple, and the armature tooth (4) and the fault-tolerant teeth (5) is total The difference of the number of teeth and the number of pole-pairs of the permanent magnet (3) is ± 2, and wherein m is the number of phases of motor.
4. the composite excitation fault-tolerant motor system of brushless harmonic exitation according to claim 1, it is characterised in that:It is described forever Shape in the embedded rotor (2) of magnet (3) is in " V " type.
CN201510964408.5A 2015-12-21 2015-12-21 A kind of composite excitation fault-tolerant motor system of brushless harmonic exitation CN105391265B (en)

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CN105811681A (en) * 2016-05-11 2016-07-27 山东理工大学 Production method for rotor of electromagnetic generator with combined type permanent magnet magnetic poles and salient poles
CN105763001A (en) * 2016-05-13 2016-07-13 山东理工大学 Production method of electromagnetic and built-in combined type radial permanent magnet drive motor rotor
CN105763003A (en) * 2016-05-13 2016-07-13 山东理工大学 Permanent magnetism and electromagnetism compounded excitation generation device rotor production method
CN108183643B (en) * 2017-12-29 2020-05-08 上海沪工焊接集团股份有限公司 Hybrid excitation system and method of power generation electric welding machine
CN111082625A (en) * 2020-01-09 2020-04-28 东华大学 Alternating magnetic pole brushless hybrid excitation synchronous motor

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CN102044946B (en) * 2010-12-24 2013-03-20 东南大学 Single-phase self-start permanent magnet synchronous motor
CN102185448B (en) * 2011-05-09 2013-04-03 清华大学 Hybrid excitation permanent magnet motor for wireless transmission and tooth harmonic excitation
CN102255460A (en) * 2011-06-20 2011-11-23 上海电机学院 Permanent magnet synchronous machine (PMSM) possessing assembled magnetic effect
JP5997928B2 (en) * 2012-05-09 2016-09-28 ミネベア株式会社 Single phase brushless motor
CN203368275U (en) * 2013-06-03 2013-12-25 东南大学 Open winding hybrid excitation motor
CN104201808B (en) * 2014-09-12 2016-08-31 东南大学 A kind of composite excitation fault-tolerant motor system based on position automatic detection

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