CN104682653A - Permanent magnet synchronous reluctance motor and compressor - Google Patents
Permanent magnet synchronous reluctance motor and compressor Download PDFInfo
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- CN104682653A CN104682653A CN201510104844.5A CN201510104844A CN104682653A CN 104682653 A CN104682653 A CN 104682653A CN 201510104844 A CN201510104844 A CN 201510104844A CN 104682653 A CN104682653 A CN 104682653A
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- mounting groove
- motor
- stator
- synchronous reluctance
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/2713—Inner rotors the magnetisation axis of the magnets being axial, e.g. claw-pole type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
- H02K21/145—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having an annular armature coil
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention discloses a permanent magnet synchronous reluctance motor and a compressor. The permanent magnet synchronous reluctance motor comprises a stator and a rotor, wherein the stator comprises a stator inner hole and a plurality of stator slots; a stator tooth is defined between every two adjacent stator slots; the rotor is arranged inside the stator inner hole; the rotor comprises a rotor inner hole and multiple mounting slot groups; a permanent magnet is arranged inside each mounting slot group; the width of each stator tooth is T; the shortest distance between each two adjacent mounting slot groups is D, and the ratio of D to T is greater than 0.8 and smaller than 1. According to the permanent magnet synchronous reluctance motor, the reluctance torque can be increased, and at the same time, the permanent magnet torque keeps unchanged or is slightly lowered, so that the total torque generated by the unit current of the motor is increased and the efficiency of the motor is improved; when the total torque output by the motor is unchanged, the input current of the stator can be reduced, the power density of the motor can be increased and the using amount of the permanent magnet can be reduced, so that the cost of the motor is lowered. Furthermore, the compressor with the motor has relatively high APF energy efficiency.
Description
Technical field
The present invention relates to machine field, especially relate to a kind of permanent magnet type synchronous reluctance motor and compressor.
Background technology
At present, in the motor that high magnetic conductive material is made, for Driving Torque and the efficiency of lifting motor, generally there are the many groups of permanent magnets be embedded in rotor core, often organize permanent magnet trough and comprise permanent magnet trough that is radially multiple or arranged tangential, such motor has the advantages that to make full use of reluctance torque, with the Driving Torque of lifting motor and efficiency.
Disclose a kind of permanent-magnet synchronous reluctance motor in the prospectus of Chinese patent CN10405227A, for obtaining higher Driving Torque, above-mentioned patent is innovated the permanent magnet arrangement in rotor core and parameters.
But by the Formula of Electromagnetic of IPM synchronous motor, T=p/ ω (E0 × iq+ (Xd-Xq) × id × iq).In formula, p is motor number of pole-pairs, and ω is motor speed, and p/ ω can be considered constant.E0 is empty load of motor back-emf, and Xd, Xq are respectively d axle and the reactance of q axle, and id, iq are the component of stator current space vector on d, q direction of principal axis.Section 1 E0 in bracket × iq is permanent-magnet torque, and permanent-magnet torque is directly proportional to unloaded back-emf E0.In bracket, Section 2 (Xd-Xq) × id × iq is reluctance torque, and reluctance torque is directly proportional to the product id × iq of ac-dc axis electric current and the difference Xd-Xq of ac-dc axis reactance.That is, under the prerequisite that motor number of pole-pairs is certain, the electromagnetic torque of IPM synchronous motor depends on permanent-magnet torque and reluctance torque sum.
In aforementioned patent, although motor improves reluctance torque by the difference improving ac-dc axis reactance, but empty load of motor back-emf can be caused to reduce, and the ratio that reluctance torque improves effectively can not make up the ratio that permanent-magnet torque declines, therefore the total Driving Torque of motor can be caused to decline, and the improved efficiency of motor is unsatisfactory.
Summary of the invention
The application proposes based on the technical problem solving prior art existence.For this reason, the present invention aims to provide a kind of permanent magnet type synchronous reluctance motor, and this permanent magnet type synchronous reluctance motor effectively can improve the Driving Torque of motor, thus improves the operational efficiency of motor.
Another object of the present invention is to provide a kind of compressor with above-mentioned permanent magnet type synchronous reluctance motor.
According to the permanent magnet type synchronous reluctance motor of the embodiment of the present invention, comprising: stator, described stator has stator inner hole and in the circumferential around multiple stator slots of described stator inner hole, limits a stator tooth between two often adjacent described stator slots; Rotor, described rotor is located in described stator inner hole rotationally, described rotor has rotor inner hole and in the circumferential around many groups mounting groove group of described rotor inner hole, often organize described mounting groove group and comprise multiple mounting groove, permanent magnet is provided with in each described mounting groove, the width in the circumferential of wherein said stator tooth is T, and the beeline described in two adjacent groups between mounting groove group is D, and described D and described T meets following relation: 0.8<D/T<1.
According to the permanent magnet type synchronous reluctance motor of the embodiment of the present invention, when the ratio of the beeline D on the width T in the circumferential and rotor of stator tooth between two adjacent groups mounting groove group is greater than 0.8 and is less than 1, the reluctance torque of motor can be increased, keep permanent-magnet torque constant or slightly reduce simultaneously, thus the total torque making motor unitary current produce improves, and then improve the efficiency of permanent magnet type synchronous reluctance motor.And under motor exports the constant prerequisite of total torque, the electric current of stator input can be reduced, improve the power density of motor, reduce the use amount of permanent magnet, thus reduce the cost of permanent magnet type synchronous reluctance motor.In addition, the compressor carried after this motor has the efficiency of higher APF.
In certain embodiments, often organize described mounting groove group and comprise spaced first mounting groove to the 3rd mounting groove, described first mounting groove and the second mounting groove are symmetrical arranged and are arranged into opening " V " shape shape toward the outer side, and described 3rd mounting groove is positioned at the opening part of described " V " shape and symmetrical center line about described first mounting groove and described second mounting groove is symmetrical.For the mounting groove of " U " shape, when adopting stator self to magnetize to rotor magnet, the arrangement of this kind of magnet significantly can reduce the voltage that magnetizes, reduce the destruction to stator winding insulation in the process of magnetizing, improve the degree of saturation that magnetizes of permanent magnet, thus improve the actual performance of motor.In addition, under the prerequisite that the total consumption of rotor magnet is identical, adopt the rotor structure described in this patent to have larger back-emf fundamental voltage amplitude, thus improve the Driving Torque of motor.In addition, also can reduce the content of odd harmonic in back-emf, thus reduce the iron loss of motor when normal operation, reduce noise vibration simultaneously.
Particularly, described first mounting groove is identical with the length W1 of the described permanent magnet placed in described second mounting groove, the length of the described permanent magnet placed in described 3rd mounting groove is W2, and described length W2 and W1 meets following relation: 0.6 < W2/W1 < 1.Thus, not only process simple and convenient, also can further improve the degree of saturation that magnetizes of permanent magnet, improve the permanent-magnet torque of motor simultaneously.
Advantageously, between each described mounting groove two ends in the longitudinal direction and corresponding described permanent magnet two ends in the longitudinal direction, there is gap.Like this, effectively leakage flux can be reduced.
Preferably, the extreme length W of each described mounting groove and the extreme length L of corresponding described permanent magnet meets following relation: 0.5 < L/W < 0.8.Thus, the gap size at permanent magnet two ends place in the longitudinal direction can be optimized, to reduce leakage flux further.
Particularly, each described mounting groove is formed as general rectangular.Thus, the simple shape of mounting groove, handling ease, the processing cost of rotor is lower.
Alternatively, the width of whole described mounting groove is all equal.Thus, permanent magnet is installed easily.
Preferably, described permanent magnet is rare earth rubidium iron boron permanent magnet.Thus, permanent magnet cost performance can be made high, and there is good mechanical property, in addition, because rubidium Fe-Mn magnetism material has the advantage of high-energy-density, thus be convenient to the miniaturization of permanent magnet, lightweight and slimming.
Particularly, described rotor is made up of multiple electromagnetic steel plate laminates that thickness is identical, and described stator is made up of multiple electromagnetic steel plate laminates that thickness is identical.
According to the compressor of the embodiment of the present invention, comprise the permanent magnet type synchronous reluctance motor described in the above embodiment of the present invention.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is the generalized section of the permanent magnet type synchronous reluctance motor according to the embodiment of the present invention;
Fig. 2 is and the generalized section not meeting the permanent magnet type synchronous reluctance motor that embodiment of the present invention optimum configurations requires compared embodiment illustrated in fig. 1;
Fig. 3 is the comparison diagram of the wave simulation result of the back-emf of two kinds of motors shown in Fig. 1 and Fig. 2, wherein, lines shown in A are the wave simulation change curve of the reluctance motor of permanent magnet type synchronous shown in Fig. 1, and lines shown in B are the wave simulation change curve of the reluctance motor of permanent magnet type synchronous shown in Fig. 2;
Fig. 4 is the magnetic line of force distribution map of stator at initial position of the reluctance motor of permanent magnet type synchronous shown in Fig. 1;
Fig. 5 is the magnetic line of force distribution map of stator at initial position of the reluctance motor of permanent magnet type synchronous shown in Fig. 2;
Fig. 6 is the torque curve comparison diagrams of two kinds of motors shown in Fig. 1 and Fig. 2 when inputting onesize electric current, wherein, lines shown in A are the torque change curve of the reluctance motor of permanent magnet type synchronous shown in Fig. 1, and lines shown in B are the torque change curve of the reluctance motor of permanent magnet type synchronous shown in Fig. 2.
Reference numeral:
Permanent magnet type synchronous reluctance motor 100, first motor A, the second motor B,
Stator 1, stator inner hole 101, stator slot 102, stator coil 103, stator tooth 104,
Rotor 2, mounting groove group 20, mounting groove 200, first mounting groove 201, second mounting groove 202, the 3rd mounting groove 203, set of permanent magnets 21, permanent magnet 210, first permanent magnet 211, second permanent magnet 212, the 3rd permanent magnet 213, rotor inner hole 22, gap 23,
Rotating shaft 3,
The width T in the circumferential of stator tooth, the beeline D between two adjacent groups mounting groove group,
The length W1 of the first permanent magnet and the second permanent magnet, the length W2 of the 3rd permanent magnet,
The extreme length W of each mounting groove, the extreme length L of each permanent magnet.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
In describing the invention, it will be appreciated that, term " " center ", " length ", " width ", " thickness ", " interior ", " outward ", " axis ", " radial direction ", " circumference " etc. instruction orientation or position relationship be based on orientation shown in the drawings or position relationship; be only the present invention for convenience of description and simplified characterization; instead of instruction or imply indication device or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise one or more these features.In describing the invention, except as otherwise noted, the implication of " multiple " is two or more.
In describing the invention, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.
Below with reference to Fig. 1-Fig. 6, the permanent magnet type synchronous reluctance motor 100 according to the embodiment of the present invention is described.
According to the permanent magnet type synchronous reluctance motor 100 of the embodiment of the present invention, as shown in Figure 1, comprising: stator 1 and rotor 2.
With reference to Fig. 1, stator 1 has stator inner hole 101 and multiple stator slot 102, and multiple stator slot 102, in the circumferential around stator inner hole 101, is wound with stator coil 103 in stator slot 102, limits a stator tooth 104 between two often adjacent stator slots 102.Rotor 2 is located in stator inner hole 101 rotationally, and namely the permanent magnet type synchronous reluctance motor 100 of the embodiment of the present invention is inner rotor motor.Rotor 2 has rotor inner hole 22 and many group mounting groove groups 20, and many group mounting groove groups 20 surrounding rotor endoporus 22 in the circumferential, often organizes mounting groove group 20 and comprise multiple mounting groove 200, be provided with permanent magnet 210 in each mounting groove 200.That is, permanent magnet 210 also comprises many groups, and many group set of permanent magnets 21 in the circumferential surrounding rotor endoporus 22 are embedded in rotor 2.Wherein, rotor inner hole 22 for being connected with rotating shaft 3, to drive rotating shaft 3 synchronous axial system.When motor application is in compressor, this rotating shaft 3 is called bent axle.Alternatively, rotor 2 and rotating shaft 3 interference fit.
It should be noted that, Formula of Electromagnetic from IPM synchronous motor: T=p/ ω (E0 × iq+ (Xd-Xq) × id × iq), under the prerequisite that motor number of pole-pairs p and motor speed ω is certain, the electromagnetic torque of motor and permanent-magnet torque are directly proportional to reluctance torque sum.For obtaining larger electromagnetic torque, the design of motor needs the Parameters variation simultaneously considering permanent-magnet torque and reluctance torque, especially needs to be in optimized selection the unloaded back-emf E0 of motor and the difference (Xd-Xq) of ac-dc axis reactance.
For this reason, inventor has carried out emulation, test to different motor, and analyzes and researches to the result of the test obtained, and its concrete analysis process, as shown in the comparative analysis process of the first motor A hereafter enumerated and the second motor B, is not described in detail here.
Find after deliberation, when permanent magnet type synchronous reluctance motor 100 meets parameter request: during 0.8<D/T<1, the reluctance torque of motor can be increased, keep permanent-magnet torque constant or slightly reduce simultaneously, thus the total torque that motor unitary current is produced raising.Wherein, as shown in Figure 1, T is the width in the circumferential of stator tooth 104, and D is the beeline between two adjacent groups mounting groove group 20.
According to the permanent magnet type synchronous reluctance motor 100 of the embodiment of the present invention, when the ratio of the beeline D on the width T in the circumferential and rotor 2 of stator tooth 104 between two adjacent groups mounting groove group 20 is greater than 0.8 and is less than 1, the reluctance torque of motor can be increased, keep permanent-magnet torque constant or slightly reduce simultaneously, thus the total torque making motor unitary current produce improves, and then improve the efficiency of permanent magnet type synchronous reluctance motor 100.And under motor exports the constant prerequisite of total torque, the electric current that stator 1 inputs can be reduced, improve the power density of motor, reduce the use amount of permanent magnet, thus reduce the cost of permanent magnet type synchronous reluctance motor 100.In addition, the compressor carried after this motor has the efficiency of higher APF.
In certain embodiments, as shown in Figure 1, often organize mounting groove group 20 and comprise spaced first mounting groove 201, second mounting groove 202 and the 3rd mounting groove 203, first mounting groove 201 and the second mounting groove 202 are symmetrical arranged and are arranged into opening " V " shape shape toward the outer side, and the 3rd mounting groove 203 is positioned at the opening part of " V " shape and symmetrical center line about the first mounting groove 201 and the second mounting groove 202 is symmetrical.
That is, in the scope of the radial reticule set with the pole minute of angle of regulation of rotor 2, often organize mounting groove group 20 and include the mounting groove 200 arranged along " V " word and a word, in each mounting groove 200, all insert a permanent magnet 210.Wherein, two mounting groove 200 (first mounting groove 201 and the second mounting groove 202) composition " V " word shapes, mounting groove 200 (the 3rd mounting groove 203) relatively above-mentioned " V " word is symmetrical, and is placed on the center of V word.
For convenience of describing, claim the permanent magnet 210 in insertion first mounting groove 201 to be the first permanent magnet 211, the permanent magnet 210 inserted in the second mounting groove 202 is the second permanent magnet 212, and the permanent magnet 210 inserted in the 3rd mounting groove 203 is the 3rd permanent magnet 213.
Here it should be noted that, motor application, when compressor, magnetizes to magnet with stator coil after motor generally adopts assembling.In some permanent-magnet synchronous reluctance motors disclosed in prior art, because mounting groove have employed " U " shape shape, and the magnet being positioned at two " U " shape limits place of the mounting groove of this " U " shape is difficult to realize saturation magnetization, this causes the actual efficiency of motor lower than theory calculate efficiency.
Certainly, the effect magnetized for reaching capacity, the also practicable way increasing substantially the voltage that magnetizes, but this can cause damage to the insulation of motor stator, and the useful life of motor is declined.
And adopt " V " font and in-line in present patent application and mounting groove group 20, set of permanent magnets 21 is engaged in mounting groove group 20, the problem that cannot magnetize can be avoided, namely improve the degree of saturation that magnetizes of permanent magnet 210, thus improve the actual performance of motor.
In addition, first mounting groove 201 and the second mounting groove 202 are symmetrical arranged to form " V " shape, under the prerequisite that the total consumption of rotor 2 magnet is identical, the counter potential waveform sine degree of motor can be improved, thus improve the amplitude being used for participating in the first-harmonic done work, and then improve the permanent-magnet torque of motor.In addition, adopt the first symmetrical mounting groove 201 and the second mounting groove 202, also can reduce the content of odd harmonic in back-emf, thus reduce the iron loss of motor when normal operation, reduce noise vibration simultaneously.
It should be noted that, each mounting groove 200 is projected as strip on the end face of rotor 2, and the longer length of side of this strip is length, and the length of side on the shorter one side of this strip is width.The length of permanent magnet 210 and the definition of width consistent with the definition mode of mounting groove 200, no longer describe here.
Particularly, as shown in Figure 1, first mounting groove 201 is identical with the length W1 of the permanent magnet 210 placed in the second mounting groove 202, namely the length of the first permanent magnet 211 and the second permanent magnet 212 is equal and be W1, the permanent magnet 210 i.e. length of the 3rd permanent magnet 213 of placing in the 3rd mounting groove 203 is that W2, length W2 and W1 meet following relation: 0.6 < W2/W1 < 1.Thus, not only process simple and convenient, also can further improve the degree of saturation that magnetizes of permanent magnet 210, improve the permanent-magnet torque of motor simultaneously.
Advantageously, as shown in Figure 1, between each mounting groove 200 two ends in the longitudinal direction and corresponding permanent magnet 210 two ends in the longitudinal direction, there is gap 23.Like this, effectively leakage flux can be reduced.
Preferably, the extreme length W of each mounting groove 200 and extreme length L of corresponding permanent magnet 210 meets following relation: 0.5 < L/W < 0.8.Thus, the size in the gap 23 at permanent magnet 210 two ends place in the longitudinal direction can be optimized, to reduce leakage flux further.
Particularly, each mounting groove 200 is formed as general rectangular.Thus, the simple shape of mounting groove 200, handling ease, the processing cost of rotor 2 is lower.
Alternatively, the width of whole mounting groove 200 is all equal.Thus, permanent magnet 210 is installed easily.
Preferably, permanent magnet 210 is rare earth rubidium iron boron permanent magnet, thus, permanent magnet 210 cost performance can be made high, and there is good mechanical property, in addition, because rubidium Fe-Mn magnetism material has the advantage of high-energy-density, thus be convenient to the miniaturization of permanent magnet 210, lightweight and slimming.
Particularly, rotor 2 is made up of multiple electromagnetic steel plate laminates that thickness is identical, and namely on the axial direction along rotor 2, rotor 2 stacks gradually compacting by multiple electromagnetic steel plate and forms.Stator 1 is made up of multiple electromagnetic steel plate laminates that thickness is identical, and namely on the axial direction along stator 1, stator 1 stacks gradually compacting by multiple electromagnetic steel plate and forms.That is, stator 1 and rotor 2 are overrided to form by multiple electromagnetic steel plates insulated from each other, suitably can reduce the eddy current loss of motor, thus reduce the energy consumption of motor, and reduce the temperature rise of motor.
More specifically, rotor 2 and stator 1 are overrided to form by laminated multi-layer electromagnetic steel plate stamping-out respectively.
Below with reference to Fig. 1-Fig. 6, to the permanent magnet type synchronous reluctance motor 100 meeting embodiment of the present invention requirement shown in Fig. 1, carry out contrast with motor shown in Fig. 2 and compare, to show the performance advantage of the permanent magnet type synchronous reluctance motor 100 according to the embodiment of the present invention.For convenience of describing, the permanent magnet type synchronous reluctance motor 100 of preferred embodiment shown in Fig. 1 being called the first motor A, being called the second motor B by contrasting motor shown in Fig. 2.
Particularly, in the first motor A shown in Fig. 1, stator slot 102 is 48, and stator coil 103 is also 48, and stator 1 defines 48 stator tooths 104.Rotor 2 has many group mounting groove groups 20, often organize mounting groove group 20 and comprise spaced first mounting groove 201, second mounting groove 202 and the 3rd mounting groove 203, first mounting groove 201 and the second mounting groove 202 are symmetrical arranged and are arranged into opening " V " shape shape toward the outer side, and the 3rd mounting groove 203 is positioned at the opening part of " V " shape and symmetrical center line about the first mounting groove 201 and the second mounting groove 202 is symmetrical.Be provided with in first mounting groove 201 in first permanent magnet 211, second mounting groove 202 to be provided with in the second permanent magnet the 212, three mounting groove 203 and be provided with the 3rd permanent magnet 213.
In the preferred embodiment, rotor 2 has eight groups of equally distributed mounting groove groups 20 of circumference, and often organize corresponding 1 pole of mounting groove group 20, namely the first motor A is the magnet baried type permagnetic synchronous motor of 8 pole rotors.
Wherein, the width T in the circumferential of stator tooth 104 is 5mm, and the beeline D between two adjacent groups mounting groove group 20 is both 4.1mm, D and T ratio is 0.82.In 3rd mounting groove 203, the length W2 of the 3rd permanent magnet 213 is that the length W1 of the first permanent magnet 211 in the 16, first mounting groove 201 and the second permanent magnet 212 in the second mounting groove 202 is respectively 18.68, and both ratios are 0.856.Two ratios meet above-mentioned 0.8<D/T<1, and the limited field of 0.6 < W2/W1 < 1.
Fig. 2 gives a contrast scheme relative to preferred embodiment shown in Fig. 1 of the present invention.In the scheme shown in Fig. 2, the structure and parameters of the second motor B and the corresponding construction of the first motor A and parameter substantially identical, repeat no more here.Due to the stator slot 102 of the second motor B and the first motor A and number of poles identical, total consumption of the permanent magnet 210 of the second motor B and the also identical of the first motor A.
Difference is, in the second motor B shown in Fig. 2, the beeline D between two adjacent groups mounting groove group 20 is both 8mm, D and T ratio is 1.3, does not meet the requirement of above-mentioned 0.8<D/T<1.
For understanding this parameter request of 0.8<D/T<1 to the impact of the electromagnetic torque Parameters variation of motor, the counter potential waveform of inventor to the first motor A and the second motor B changes and emulates, and also compares the magnetic line of force distribution of two kinds of motors when stator 1 is positioned at initial position.
Fig. 3 is the FEM Numerical Simulation of the waveform of the unloaded back-emf of the first motor A and the second motor B.As can be seen from the figure, the back-emf effective value in an electric cycle of the first motor A is about 144V, the back-emf effective value in an electric cycle of the second motor B is about 138V, and the back-emf in an electric cycle of the first motor A is apparently higher than the second motor B, and difference is between the two 6V.Be converted into back emf coefficient, then the back emf coefficient of the first motor A is 48V/krpm, and the back emf coefficient of the second motor B is 46V/krpm, and the second motor B is lower than the back emf coefficient of the first motor A by about 4.3%.
Fig. 4 and Fig. 5 be respectively the first motor A and the second motor B a pair extremely under the FEM Numerical Simulation of magnetic line of force distribution, both all adopt identical setting.Wherein, the magnetic line of force that our definition is closed by stator tooth, stator yoke, air gap, rotor core is completely main flux, and the magnetic line of force closed by other paths is leakage flux, the wherein value direct proportionality of main flux and back-emf.
Can be found by Fig. 4 and Fig. 5, in Fig. 4 between adjacent pole leakage field (magnetic line of force passes through rotor core, pair of magnet not under homopolarity closes) many, but in Fig. 5, the leakage field (magnetic line of force is closed by rotor core and magnet itself) of magnet self is more serious.Consider magnet self leakage field and interelectrode magnetic leakage, the magnet leakage field in Fig. 5 is more serious.Therefore the back-emf of the second motor B is lower than the first motor A.The quantity of total magnetic line of force of stator tooth is extremely descended also to embody this point by a pair.
Fig. 6 is that the FEM Numerical Simulation of the first motor A and the motor output torque of the second motor B when stator adopts onesize electric current contrasts.The Driving Torque of the first motor A is 7.8894Nm, and the Driving Torque of the second motor B is 7.547Nm.The Driving Torque of the first motor A exceeds the second motor B about 4%, and the input current of motor is identical, and stator resistance is also identical, and therefore the copper loss of motor is identical, and the iron loss of motor is also approximate identical, and therefore the efficiency of the first motor A is higher than the efficiency of the second motor B.
To sum up, we obviously can reach a conclusion: in permanent magnet type synchronous reluctance motor 100, when the ratio of the beeline D on the width T in the circumferential and rotor 2 of stator tooth 104 between two adjacent groups mounting groove group 20 is greater than 0.8 and is less than 1, the total torque that motor unitary current produces can be significantly improved.
It should be added that, in the comparative examples of Fig. 1 and Fig. 2, only list that stator slot 102 is 48 grooves, the number of poles of rotor 2 is the situation of 8 poles, but the number of poles of stator slot 102 quantity of the motor in the embodiment of the present invention and rotor 2 is not limited thereto, motor after stator slot 102 number with rotor 2 number of poles reasonable combination, after have employed the implementation method identical with embodiments of the invention, also can reach same beneficial effect.
In addition, the permanent magnet type synchronous reluctance motor 100 described in the embodiment of the present invention, can be used as the driving motor of the industrial machines such as compressor, air blast, hybrid electric vehicle, pump.
According to the compressor of the embodiment of the present invention, comprise permanent magnet type synchronous reluctance motor 100 according to the above embodiment of the present invention.
According to the compressor of the embodiment of the present invention, owing to being provided with the permanent magnet type synchronous reluctance motor 100 according to the embodiment of the present invention, thus add the total torque of motor unitary current generation, improve the efficiency of permanent magnet type synchronous reluctance motor 100, the efficiency of the APF of compressor is higher.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalents thereof.
Claims (10)
1. a permanent magnet type synchronous reluctance motor, is characterized in that, comprising:
Stator, described stator has stator inner hole and in the circumferential around multiple stator slots of described stator inner hole, limits a stator tooth between two often adjacent described stator slots;
Rotor, described rotor is located in described stator inner hole rotationally, described rotor has rotor inner hole and in the circumferential around many groups mounting groove group of described rotor inner hole, often organize described mounting groove group and comprise multiple mounting groove, permanent magnet is provided with in each described mounting groove, the width in the circumferential of wherein said stator tooth is T, and the beeline described in two adjacent groups between mounting groove group is D, and described D and described T meets following relation: 0.8<D/T<1.
2. permanent magnet type synchronous reluctance motor according to claim 1, it is characterized in that, often organize described mounting groove group and comprise spaced first mounting groove to the 3rd mounting groove, described first mounting groove and the second mounting groove are symmetrical arranged and are arranged into opening " V " shape shape toward the outer side, and described 3rd mounting groove is positioned at the opening part of described " V " shape and symmetrical center line about described first mounting groove and described second mounting groove is symmetrical.
3. permanent magnet type synchronous reluctance motor according to claim 2, it is characterized in that, described first mounting groove is identical with the length W1 of the described permanent magnet placed in described second mounting groove, the length of the described permanent magnet placed in described 3rd mounting groove is W2, and described length W2 and W1 meets following relation: 0.6 < W2/W1 < 1.
4. permanent magnet type synchronous reluctance motor according to claim 1, is characterized in that, has gap between each described mounting groove two ends in the longitudinal direction and corresponding described permanent magnet two ends in the longitudinal direction.
5. permanent magnet type synchronous reluctance motor according to claim 4, it is characterized in that, the extreme length W of each described mounting groove and the extreme length L of corresponding described permanent magnet meets following relation: 0.5 < L/W < 0.8.
6. permanent magnet type synchronous reluctance motor according to claim 1, is characterized in that, each described mounting groove is formed as general rectangular.
7. permanent magnet type synchronous reluctance motor according to claim 6, is characterized in that, the width of whole described mounting groove is all equal.
8. permanent magnet type synchronous reluctance motor according to claim 1, is characterized in that, described permanent magnet is rare earth rubidium iron boron permanent magnet.
9. permanent magnet type synchronous reluctance motor according to claim 1, is characterized in that, described rotor is made up of multiple electromagnetic steel plate laminates that thickness is identical, and described stator is also made up of multiple electromagnetic steel plate laminates that thickness is identical.
10. a compressor, is characterized in that, comprises the permanent magnet type synchronous reluctance motor according to any one of claim 1-9.
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| CN201510104844.5A CN104682653A (en) | 2015-03-10 | 2015-03-10 | Permanent magnet synchronous reluctance motor and compressor |
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| CN201510104844.5A CN104682653A (en) | 2015-03-10 | 2015-03-10 | Permanent magnet synchronous reluctance motor and compressor |
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| CN105811683A (en) * | 2016-05-11 | 2016-07-27 | 山东理工大学 | Production method for rotor of dual-radial permanent magnet steel driving motor |
| CN107516953A (en) * | 2017-10-23 | 2017-12-26 | 安徽栋霖电气有限公司 | A kind of mixed type permanent-magnet pole rotor |
| CN108599407A (en) * | 2018-05-24 | 2018-09-28 | 浙江达可尔汽车电子科技有限公司 | Efficient permanent magnet new-energy automobile power motor electromagnetism punching |
| CN110277851A (en) * | 2019-07-23 | 2019-09-24 | 中达电机股份有限公司 | Mixed magneto rotor and its mixed magneto |
| CN110635598A (en) * | 2019-10-25 | 2019-12-31 | 上海电力大学 | Harmonic content weakening-based vibration suppression method for permanent magnet synchronous motor for electric vehicle |
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| CN204442139U (en) * | 2015-03-10 | 2015-07-01 | 广东美芝制冷设备有限公司 | Permanent magnet type synchronous reluctance motor and compressor |
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| CN105811683A (en) * | 2016-05-11 | 2016-07-27 | 山东理工大学 | Production method for rotor of dual-radial permanent magnet steel driving motor |
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| CN110635598A (en) * | 2019-10-25 | 2019-12-31 | 上海电力大学 | Harmonic content weakening-based vibration suppression method for permanent magnet synchronous motor for electric vehicle |
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