CN103795164A - Permanent-magnet synchronous motor - Google Patents
Permanent-magnet synchronous motor Download PDFInfo
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Abstract
The invention provide a permanent-magnet synchronous motor (PMSM) capable of effectively reducing copper loss by using a magnet with residual magnetic flux density of 0.3 to 0.5T and preferably a ferrite magnet. A the residual magnetic flux density of a permanent magnet imbedded into a rotor is set within a range from 0.3 to 0.5T. A ratio of the internal diameter (diameter) St1 of a stator accommodating the rotor to the external diameter (diameter) St2 of the stator is set within a range from 0.53 to 0.69T. Therefore, the copper loss of the PMSM using the permanent magnet with residual magnetic flux density of 0.3 to 0.5T is effectively reduced and high efficiency of the PMSM is obtained.
Description
Technical field
The present invention relates to permanent magnet synchronous motor, relate in particular to the permanent magnet synchronous motor of imbedding structure type that is embedded with permanent magnet in rotor core.
Background technology
In general,, as the motor using, more use permanent magnet synchronous motor in household appliance technical field such as the supplying hot water electrical equipment of the automotive field such as electric automobile, hybrid vehicle and conditioner, refrigerator, employing heat pump etc.This permanent magnet synchronous motor is the synchronous motor that has used permanent magnet in the magnetic field (magnetic pole) at rotor.
And, in this permanent magnet synchronous motor, extensively adopt the permanent magnet synchronous motor of imbedding structure type (Interior Permanent Magnet Synchronous Motor) of having buried permanent magnet in rotor core underground.This permanent magnet synchronous motor of imbedding structure type is by using the rotor of imbedding permanent magnet in magnetic field, the torque that not only can utilize permanent magnet to produce, and can utilize the caused torque of asymmetry (reluctance torque) of the magnetic resistance (magnetic resistance) in magnetic field.
But in order to improve the performance of permanent magnet synchronous motor, known as long as strengthen the magnetic field intensity of the permanent magnet that uses, therefore more use rare earth element magnet using neodium magnet as representative as the strong magnet of magnetic field intensity.Thus, can obtain little shape, high output, high efficiency permanent magnet synchronous motor.
In addition, usually, this permanent magnet synchronous motor such as, limits its physique (so-called size) according to installed machine (heat pump, the refrigerator etc. of conditioner, supplying hot water electrical equipment).Therefore, exploration permanent magnet synchronous motor and the corresponding optimum configuration of problem that should tackle, by not changing the external diameter of profile or stator side, and the size of the inscape (such as rotor, stator, winding wire etc.) of change formation motor or physical property, the characteristic etc. of material are carried out.
And, as the example that obtains the permanent magnet synchronous motor that reduces cogging torque (cogging torque) by the exploration of this optimum configuration, for example, according to the technology of recording in TOHKEMY 2006-101606 communique (patent documentation 1), following scheme is proposed: be that neodium magnet is as prerequisite to use rare earth element magnet in the magnetic field of rotor, the shape of groove (slot) is becomed privileged, and the relation of external diameter (diameter) St2 of the internal diameter of stator (diameter) St1 and stator is set as to St1/St2=0.5～0.6, thereby reduce reduction and the noise of the cogging torque of permanent magnet synchronous motor.
Patent documentation 1:JP JP 2006-101606 communique
But, material cost at this permanent magnet synchronous motor middle rare earth class magnet that has used rare earth element magnet is high, in addition need to add dysprosium (Dy) and the such few heavy rare earth class of output of terbium (Tb) using the raising of coercive force as object, there is problem in the viewpoint of therefore preparing from material.Therefore, preferably do not use rare earth element magnet and use can stable supplying the permanent magnet take ferrite lattice as representative.
But usually the performance of permanent magnet is represented by relict flux density and these two physical quantitys of coercive force, for example, the in the situation that of ferrite lattice, the representative of relict flux density, the relative rare earth element magnet of coercive force is that neodium magnet is respectively roughly 1/3 degree.Therefore, neodium magnet being merely replaced in the permanent magnet synchronous motor of ferrite lattice, the reduction of relict flux density is associated with the increase to copper loss, and it is many that the electric energy losing by the electrical resistance (winding wire resistance) of winding wire becomes, and causes significant performance to reduce.
In addition, the technology of recording in above-mentioned patent documentation 1, for for reducing being the exploration of neodium magnet as the optimum configuration of the cogging torque of prerequisite to use rare earth element magnet in the magnetic field of rotor, it is the exploration of the optimum configuration of the problem to different from the problem of copper loss that reduces the permanent magnet synchronous motor that uses ferrite lattice.
Usually, the relict flux density of neodium magnet is approximately large to 1.2T, but the relict flux density of ferrite lattice is approximately 0.3T～0.5T.Therefore as described above, use the permanent magnet synchronous motor of ferrite lattice with respect to the permanent magnet synchronous motor that has used neodium magnet, the tendency increasing with copper loss in result by the reduction of relict flux density is associated, and the tendency of this variation is also different in addition.
On the other hand, used the permanent magnet synchronous motor of ferrite lattice with respect to the permanent magnet synchronous motor that has used neodium magnet, relict flux density is little of about 0.3T～0.5T from about 1.2T, and therefore iron loss diminishes.But, if it is same to establish the torque phase that becomes target of permanent magnet synchronous motor, used the permanent magnet synchronous motor of ferrite lattice to increase necessary current value with respect to the permanent magnet synchronous motor that has used neodium magnet.Current value increases this situation and is also associated with the further increase of copper loss.
Therefore the permanent magnet synchronous motor that, has used ferrite lattice due to the increase of the caused copper loss of difference of magnet and for obtain the torque that becomes target electric current increase and loss becomes large.Therefore,, compared with adopting the permanent magnet synchronous motor of neodium magnet of same physique, there is the problem that has used the permanent magnet synchronous motor of ferrite lattice to cause large width to lower efficiency.
Because becoming unstable and so on social background, the preparation of neodium magnet make to use ferrite lattice strongly to be asked, but because above-mentioned reason is known, the exploration that can reduce the optimum configuration of copper loss in the permanent magnet synchronous motor that has used ferrite lattice becomes important.
In addition, represent that at this ferrite lattice is as magnet that can stable supplying, but this is the magnet exemplified with the representative that can stably supply with, in addition also can adopt other magnet that replace this magnet, can adopt relict flux density as this magnet is the magnet of about 0.3T～0.5T.
Summary of the invention
The object of the present invention is to provide a kind of to use relict flux density as the magnet of about 0.3T～0.5T, preferably ferrite lattice is as prerequisite and can effectively reduce the permanent magnet synchronous motor of copper loss.
The invention is characterized in, the relict flux density of the permanent magnet of imbedding rotor is set as to the scope of 0.3T～0.5T, and storage internal diameter (diameter) St1 of stator of rotor and the ratio St1/St2 of external diameter (diameter) St2 of stator are set in to 0.53～0.69 scope.
The effect of invention
By the present invention, effectively reduce the permanent magnet that adopts the relict flux density scope in 0.3T～0.5T permanent magnet synchronous motor copper loss and seek high efficiency.
Accompanying drawing explanation
Fig. 1 is the longitudinal section of the stator of the permanent magnet synchronous motor of one embodiment of the invention.
Fig. 2 is that the internal diameter of the stator shown in presentation graphs 1 and the ratio of external diameter are the performance plot of the relation of the copper loss of boss ratio and the permanent magnet synchronous motor that has used ferrite lattice and neodium magnet.
Fig. 3 represents the boss ratio of stator and the resistance value of winding wire and the performance plot of the relation of the square value of mobile electric current therein.
Fig. 4 is summation external diameter ratio, has carried out measuring with the relation of copper loss the mensuration figure obtaining for the ratio of the boss ratio to stator, the summation of facewidth degree and the external diameter of stator.
Fig. 5 for the ratio of the boss ratio to stator, the summation of facewidth degree and the external diameter of stator be summation external diameter than and the relation of copper loss carried out measuring the mensuration figure obtaining.
Fig. 6 is the longitudinal section of the stator of the permanent magnet synchronous motor of other enforcements of the present invention.
Embodiment
Below, with reference to accompanying drawing, embodiments of the present invention are at length described, but the present invention is not limited to following execution mode, in the scope of the concept of technology of the present invention, also comprises various variation and application examples.
In addition, in following illustrated embodiment, enumerating ferrite lattice as permanent magnet is example, but the present invention to be to use relict flux density as the magnet of about 0.3T～0.5T is as prerequisite, and this is represented as ferrite lattice.
In Fig. 1, represent the longitudinal section of the stator that forms permanent magnet synchronous motor.In addition, in Fig. 1, omit the expression of winding wire (winding wire).Stator 10A is made up of following part: the core main body 12A being made up of magnetic; Multiple groove 14A of the winding wire storage use forming in the inner circumferential side of core main body 12A; Tooth (teeth) 16A forming between each groove 14A; Circular and the cross section forming with the outer circumferential side at core main body 12A has the core back of the body (core back) 18A of the shape of waveform.
In the stator 10A of this structure, the permanent magnet (following, as being represented as ferrite lattice) that carries out reducing using relict flux density to be about 0.3T～0.5T is as the exploration of the optimum configuration of the copper loss of the permanent magnet synchronous motor of the magnet of imbedding in rotor.
The internal diameter St1 of stator 10A and the relation of the boss ratio St1/St2 of external diameter St2 and the variation of copper loss that in Fig. 2, represent to adopt the permanent magnet synchronous motor of ferrite lattice and adopt the permanent magnet synchronous motor of neodium magnet.At this, internal diameter St1 represents the diameter of the interior perimembranous of the stator 10A being formed by the end 16A of distortion T word shape, and external diameter St2 represents the diameter of the peripheral part of the stator 10A being formed by the large 18A-1 of portion in footpath of core back of the body 18A.
In Fig. 2, transverse axis is made as to the internal diameter St1 of stator 10A and the boss ratio St1/St2 of external diameter St2, the longitudinal axis is made as the size of the copper loss of permanent magnet synchronous motor.In addition, the exploration of the optimum configuration of permanent magnet synchronous motor in the present embodiment, by not changing the external diameter of stator, is carried out and change internal diameter.In Fig. 2 in order relatively to have represented to use the permanent magnet synchronous motor in the situation of ferrite lattice and to have used the copper loss of the permanent magnet synchronous motor in the situation of neodium magnet.
As shown in Figure 2, use the copper loss of the permanent magnet synchronous motor in the situation of ferrite lattice protruding characteristic is shown downwards and has the region that copper loss is low, used the copper loss of the permanent magnet synchronous motor in the situation of neodium magnet to there is the characteristic of general planar.Therefore, the known special region that existence reduces copper loss as much as possible in the situation that having used ferrite lattice, also exists the so effective region of copper loss even if explore boss ratio St1/St2 in the situation that having used neodium magnet.
And, its result, according to the known like that thicker region (in Fig. 2 in the footpath of core direction thickness (St2-St1) of Fig. 2, general boss ratio St1/St2 is the region below 0.52) and the region of the footpath direction thinner thickness of core (in Fig. 2, general boss ratio St1/St2 is more than 0.70 region) in copper loss increase larger, the specific region copper loss that is 0.53≤St1/St2≤0.69 at boss ratio St1/St2 reduces.In addition, below, St1/St2 is recited as 0.53～0.69.Therefore,, if the internal diameter St1 of known decision stator and external diameter St2 are so that this boss ratio St1/St2 enters into 0.53～0.69 scope, can reduce copper loss.In addition, though the scope in boss ratio St1/St2=0.53～0.69, preferably use boss ratio St1/St2 in 0.57≤St1/St2≤0.64 scope of (St1/St2=0.57～0.64) find that copper loss further reduces.
At this, in the exploration of the present embodiment, the difference of the core back of the body periphery footpath St2 of the large 18A-1 of portion in footpath of 18A and the diameter St3 of the outermost perimembranous of groove 14A is the scope that the core across back degree Lcb of core back of the body 18A is decided to be 0.8 × 2Tp≤Lcb≤1.6 × 2Tp.At this, T is the length of the cross-sectional width of the circumferential direction of tooth 16A, and p is every mutually every utmost point groove number.The core across back degree Lcb of this core back of the body 18A is the parameter that should consider on the basis that reduces copper loss.
As described above, explore copper loss according to the boss ratio St1/St2 of stator 10 of permanent magnet synchronous motor that has adopted ferrite lattice in the present embodiment and how to change, find in 0.53～0.69 the region in specific scope, to have the state that copper loss is low at boss ratio St1/St2.The region reducing as copper loss, finds can further reduce copper loss in the scope that is more preferably 0.57～0.64 at boss ratio St1/St2.Therefore, can reduce as much as possible to use the copper loss of the permanent magnet synchronous motor of the ferrite lattice that can stably supply with, efficient permanent magnet synchronous motor can be provided.
Next, according to the relation of target torque and current value, copper loss is described.
For example, in the situation that changing to ferrite lattice from neodium magnet, the relict flux density of permanent magnet becomes approximately 1/3.The magnet torque type of permanent magnet synchronous motor is represented by following formula 1.
(formula 1)
(τ
m: torque, E
0: zero load induction power, ω: speed, iq:q shaft current, Ψ
p: magnet magnetic flux)
Hence one can see that, magnet magnetic flux Ψ
pproportional with the relict flux density of magnet, therefore in the situation that changing to ferrite lattice from neodium magnet, magnet magnetic flux Ψ
pbecome approximately 1/3, in the situation that having used ferrite lattice, need for approximately 3 times in order to export the current value of the necessary q shaft current of same torque.Therefore, because copper loss (Joule heat) is represented by following formula 2, thereby the increase of current value is not preferred.
(formula 2)
P
cu＝I
2R
(P
cU: copper loss, I: mobile electric current, R in winding wire: the resistance of winding wire)
, in order to obtain same torque, the current value of q shaft current becomes approximately 3 times, thus if resistance value does not change, by current value square and copper loss becomes approximately 9 times.Become 9 times by this copper loss, the Efficiency Decreasing of the known permanent magnet synchronous motor that has adopted ferrite lattice.
Adopted as above in the situation of ferrite lattice, the composition of loss is that copper loss occupies major part, therefore need to increase magnet surface and amasss and guarantee magnet magnetic flux Ψ for permanent magnet synchronous motor being carried out to high efficiency with same physique
preduce copper loss.Amass and magnet magnetic flux Ψ in order to increase magnet surface
pcan by increase imbed ferrite lattice rotor diameter come corresponding., the diameter of rotor is relevant with the internal diameter St1 of stator 10, therefore can set suitable current value by the boss ratio St1/St2 that suitably selects stator 10A from 0.57～0.69, can reduce current value.
On the other hand, form copper loss P
cuthe resistance R of winding wire represented by following formula 3.
(formula 3)
R＝ρ·L/A
(ρ: resistivity, L: the length of winding wire, A: the sectional area of winding wire)
At this, the sectional area A of so-called winding wire is that the sectional area of slot part 14A that is wound around the region of winding wire amasss with the fill-in ratio of winding wire (lamination factor) is, if do not change the external diameter St2 of stator 10A, the increase of the diameter by rotor, the internal diameter St1 of stator 10A increase and the sectional area of groove 14 diminishes, the sectional area A of winding wire also reduces thus.
In Fig. 3, establishing boss ratio St1/St2 is transverse axis, and the longitudinal axis represents the resistance value of winding wire and the square value of mobile electric current in winding wire.Also distribute boss ratio St1/St2 according to the mode of the external diameter that does not change stator 10 in this case.The square value of electric current along with the increase of boss ratio St1/St2, core footpath direction thickness St2-St1 attenuation and further reduce, together with the increase of resistance value and boss ratio St1/St2, increase to carry out conversely, the long-pending of the square value of these resistance values and electric current represents as the variation characteristic of the copper loss shown in Fig. 2.In addition, as shown in Figure 3, resistance value changes according to the thickness of core across back degree Lcb, and the management therefore causing is thus also important.
Anticipation is copper loss P due to core across back degree Lcb
cUthe scope that becomes minimum boss ratio St1/St2 is certainly different.If the pass that in the present embodiment, the length T of the width of tooth 16A, every mutually every utmost point groove are counted p and core across back degree Lcb is as described above 0.8 × 2Tp≤Lcb≤1.6 × 2Tp, in the scope of boss ratio St1/St2=0.53～0.69 of stator 10, can reduce as much as possible copper loss P
cu.
In addition, think in the case of having adopted the permanent magnet synchronous motor of neodium magnet the region of copper loss step-down indefinite be that the impact that causes due to magnetic saturation is large, the long-pending and magnet magnetic flux Ψ of magnet surface
pproportionate relationship be false.As mentioned above, in the permanent magnet synchronous motor that has used neodium magnet, there is the characteristic that does not occur clearly the such special region of the present embodiment.
On the other hand, make the boss ratio St1/St2 of stator 10A at least in 0.53～0.69 specific scope by reducing as much as possible the research (exploration that copper loss reduces) of copper loss and so on as in this embodiment, thereby can use the efficiency of the permanent magnet motor of ferrite lattice to increase significantly.
Next, the best relation of the external diameter St2 of the summation Tt of the length T of the width to full-depth tooth 16A and stator 10A, summation external diameter describe than Tt/St2.At this, summation Tt tooth 16A in Fig. 1 is 9, therefore summation Tt=9 × T.And, by inventor's etc. investigation, can distinguish that summation external diameter more greatly more can reduce copper loss than Tt/St2 in the situation that using easy magnetically saturated neodium magnet, in the situation that using ferrite lattice, summation external diameter is than the more little copper loss that more can reduce of Tt/St2.In addition the boss ratio St1/St2 that, distinguishes Tt/St2 and above-mentioned stator 10 also has correlation.Therefore,, if the boss ratio St1/St2 based on stator 10A in the known permanent magnet synchronous motor having used ferrite lattice brings summation external diameter in the scope of regulation together than Tt/St2, can further reduce copper loss.But this summation external diameter also has correlation than the physique of Tt/St2 and permanent magnet synchronous motor, the breakdown torque that becomes target.
The caused summation external diameter of size that can reduce this breakdown torque is described than the scope of the copper loss of Tt/St2.Copper loss measured value shown in Fig. 4 is the measurement result that has used the copper loss of the permanent magnet synchronous motor of the ferrite lattice of the scope of breakdown torque τ m in 1Nm≤τ m < 5Nm.In addition the scope of the output Pout of this permanent magnet synchronous motor in 1kW≤Pout≤5kW.
In Fig. 4, transverse axis is the boss ratio St1/St2 of stator 10A, and the longitudinal axis is that summation external diameter compares Tt/St2.The permanent magnet synchronous motor turning round in the scope of above-mentioned breakdown torque take the boss ratio St1/St2 of stator 10A as 0.53～0.69 and summation external diameter than Tt/St2 as Tt/St2≤0.73-20 (St1/St2-0.64)
2scope carry out work as center.
And, in Fig. 4, represent the value that connects identical copper loss line (hereinafter referred to as etc. copper loss line).As shown in Figure 4, the boss ratio St1/St2 by stator 10 be 0.53～0.69 and summation external diameter be Tt/St2≤0.73-20 (St1/St2-0.64) than Tt/St2
2in the part that the scope determining is surrounded, reduce copper loss.For example Tt/St2≤0.73-20 (St1/St2-0.64)
2scope can as inner side etc. near value copper loss line read.
As mentioned above, in the permanent magnet synchronous motor of ferrite lattice that has used the scope of breakdown torque τ m in 1Nm≤τ m < 5Nm, as the priority that can reduce copper loss, can determine in the following order: scope, (2) summation external diameter that the boss ratio St1/St2 of (1) stator 10A is 0.53～0.69 are Tt/St2≤0.73-20 (St1/St2-0.64) than Tt/St2
2scope, the scope that (3) core across back degree Lcb is 0.8 × 2Tp≤Lcb≤1.6 × 2Tp, also can suitably combine these conditions and decide the structure of the permanent magnet synchronous motor that has used ferrite lattice.
Next, to breakdown torque than the large permanent magnet synchronous motor of above-mentioned permanent magnet synchronous motor in, can reduce summation external diameter and describe than the scope of the copper loss of Tt/St2.Copper loss measured value shown in Fig. 5 is the measurement result that has used the copper loss of the permanent magnet synchronous motor of the ferrite lattice of the scope of breakdown torque τ m in 10Nm≤τ m < 25Nm.In addition, the scope that the output Pout of this permanent magnet synchronous motor is 6kW≤Pout≤15kW.
In Fig. 5, the permanent magnet synchronous motor turning round in the scope of above-mentioned breakdown torque take the boss ratio St1/St2 of stator 10 as 0.53～0.69 and summation external diameter than Tt/St2 as 0.35+20 (St1/St2-0.64)
2≤ Tt/St2≤1.2-20 (St1/St2-0.64)
2scope carry out work as center.
And, in Fig. 5, the copper loss line such as similarly represent with Fig. 4.As shown in Figure 5, the boss ratio St1/St2 by stator 10A be 0.53～0.69 and summation external diameter be 0.35+20 (St1/St2-0.64) than Tt/St2
2≤ Tt/St2≤1.2-20 (St1/St2-0.64)
2in the part that the scope determining is surrounded, copper loss is reduced.For example, 0.35+20 (St1/St2-0.64)
2≤ Tt/St2≤1.2-20 (St1/St2-0.64)
2scope can as inner side etc. copper loss line outside etc. near value copper loss line read.
As mentioned above, in the permanent magnet synchronous motor of ferrite lattice that has used the scope of breakdown torque τ m in 10Nm≤τ m < 25Nm, can be determined by following order as the priority that can reduce copper loss: scope, (2) summation external diameter that the boss ratio St1/St2 of (1) stator 10 is 0.53～0.69 are 0.35+20 (St1/St2-0.64) than Tt/St2
2≤ Tt/St2≤1.2-20 (St1/St2-0.64)
2scope, the scope that (3) core across back degree Lcb is 0.8 × 2Tp≤Lcb≤1.6 × 2Tp, as long as decide the structure of the permanent magnet synchronous motor that has used ferrite lattice by appropriately combined these conditions.
Fig. 6 represents the variation of stator, and this stator 10B has represented to implement the example that distributes and be wound around.In Fig. 6, represent that the winding wire of formation permanent magnet synchronous motor is distributed the longitudinal section of the stator of winding.In addition, in Fig. 6, omit the expression of winding wire.Stator 10B is made up of following part: multiple groove 14B, the tooth 16B forming between each groove 14B of the core main body 12B being made up of magnetic, the winding wire forming in the inner circumferential side of core main body 12B storage use, the core back of the body 18B with the circular shape forming at the outer circumferential side of core main body 12B.
It is the end 16B-1 that is out of shape T word shape that tooth 16B has carrying on the back cross section, 18B opposition side with core, the interior perimembranous of all formation stators of the end 16B-1 of this distortion T word shape.Therefore, in the interior perimembranous being formed by end 16B-1, insert configuration rotor (not shown).The peripheral cross-section of core back of the body 18B becomes annulus.
In groove 14B, storage is distributed the distributed winding line of winding, and each winding wire is overlapping in end.The stator 10B that this distributed winding forms is known structure.And, be distributed in the stator 10B of winding also as described above at this, can reduce as far as possible copper loss.; as the priority that can reduce copper loss, can be determined by following order: scope, (2) summation external diameter that the boss ratio St1/St2 of (1) stator 10 is 0.53～0.69 are Tt/St2≤0.73-20 (St1/St2-0.64) than Tt/St2
2, or summation external diameter be 0.35+20 (St1/St2-0.64) than Tt/St2
2≤ Tt/St2≤1.2-20 (St1/St2-0.64)
2scope, the scope that (3) core across back degree Lcb is 0.8 × 2Tp≤Lcb≤1.6 × 2Tp.
In the above description, the number of establishing groove 14A in the stator 10A shown in Fig. 1 is 9 grooves, but is essentially 3 grooves above, is therefore not limited thereto.In addition, stator is the concentrated stator 10A being wound around in Fig. 1, but as shown in Figure 6 for the stator 10B being wound around that distributes also has no relations.
In addition,, although not explanation in the present embodiment has various modes as the embedded mode of the permanent magnet of imbedding in rotor, also can adopt in the present embodiment the embedded mode of U font or V font.
The permanent magnet synchronous motor that has used ferrite lattice discussed above can adopt in more electrical equipment, the power source of the compressor that especially permanent magnet synchronous motor of the scope of breakdown torque τ m in 1Nm≤τ m < 5Nm uses in as home-use conditioner is suitable for, and then the power source of the compressor that uses in as the conditioner of using in business of the permanent magnet synchronous motor of the scope of breakdown torque τ m in 10Nm≤τ m < 25Nm is suitable for.
And then establishing in an embodiment permanent magnet is ferrite lattice, but the relict flux density of magnet is that magnet between 0.3T～0.5T can stably obtain if, is therefore not limited to ferrite lattice, and also it doesn't matter for other permanent magnet.But, use ferrite lattice because the past, therefore there is the known and easy to handle effects such as its characteristic, physical property.
In addition, the material of stator also can be made up of the stacked silicon steel plate of accumulating on direction of principal axis in order to reduce vortex flow loss, also can be made up of compressed-core etc.And then, also can be formed by noncrystalline metal etc.
As discussed above, according to the present invention, the relict flux density of the permanent magnet of imbedding is set as to the scope of 0.3T～0.5T in rotor, and storage internal diameter (diameter) St1 of stator of rotor and the ratio St1/St2 of external diameter (diameter) St2 of stator are set as to 0.53～0.69 scope.
As above, if the ratio St1/St2 of external diameter (diameter) St2 of the internal diameter of stator (diameter) St1 and stator is set as to 0.53～0.69, use the copper loss of the permanent magnet synchronous motor in the situation of ferrite lattice illustrate to the characteristic of lower convexity and have the special region that copper loss is low.
Therefore, by the ratio St1/St2 of external diameter (diameter) St2 of the internal diameter of stator (diameter) St1 and stator is set as to 0.53～0.69 scope, thus effectively reduced to adopt the permanent magnet of the scope that relict flux density is 0.3T～0.5T permanent magnet synchronous motor copper loss and seek the high efficiency of permanent magnet synchronous motor.
The explanation of symbol
10A, 10B... stator, 12A, 12B... core main body, 14A, 14B... groove, 16A, 16B... tooth, 18A, the 18B... core back of the body, the internal diameter of St1... stator, the external diameter of St2... stator, the width of T... tooth, Lcb... core across back degree.
Claims (9)
1. a permanent magnet synchronous motor, at least forms at interior rotor and the stator of receiving above-mentioned rotor by possessing to form permanent magnet that multipole mode configures, and this permanent magnet synchronous motor is characterised in that,
The scope of the relict flux density of above-mentioned permanent magnet in 0.3T～0.5T, and the scope of the ratio St1/St2 of the internal diameter St1 of said stator and the external diameter St2 of said stator in 0.53≤St1/St2≤0.69, wherein, above-mentioned internal diameter and external diameter are diameter.
2. permanent magnet synchronous motor according to claim 1, is characterized in that,
In above-mentioned permanent magnet, use ferrite lattice.
3. permanent magnet synchronous motor according to claim 1, is characterized in that,
Said stator is to concentrate the distribution that is wound around the concentrated winding stator of winding wire or distributes winding winding wire to be wound around any in stator.
4. permanent magnet synchronous motor according to claim 2, is characterized in that,
The scope of the ratio St1/St2 of the internal diameter St1 of said stator and the external diameter St2 of said stator in 0.57≤St1/St2≤0.64, wherein, above-mentioned internal diameter and external diameter are diameter.
5. permanent magnet synchronous motor according to claim 4, is characterized in that,
The scope of the breakdown torque τ m of above-mentioned permanent magnet synchronous motor in 1Nm≤τ m < 5Nm, the summation of the length T of the width of the tooth of said stator in circumferential direction be Tt with the ratio Tt/St2 of the external diameter St2 of said stator in Tt/St2≤0.73-20 (St1/St2-0.64)
2scope, wherein, above-mentioned external diameter is diameter.
6. permanent magnet synchronous motor according to claim 4, is characterized in that,
In scope at the breakdown torque τ m of above-mentioned permanent magnet synchronous motor in 10Nm≤τ m < 25Nm, the summation of the length T of the width of the tooth of said stator in circumferential direction be Tt with the ratio Tt/St2 of the external diameter St2 of said stator in 0.35+20 (St1/St2-0.64)
2≤ Tt/St2≤1.2-20 (St1/St2-0.64)
2scope, wherein, above-mentioned external diameter is diameter.
7. according to the permanent magnet synchronous motor described in claim 5 or 6, it is characterized in that,
The pass that the length T of the width of above-mentioned tooth, every mutually every utmost point groove are counted the core across back degree Lcb between the external diameter St2 of p and said stator and the most peripheral of the groove of said stator is the scope of 0.8 × 2Tp≤Lcb≤1.6 × 2Tp, and wherein, above-mentioned external diameter is diameter.
8. according to the permanent magnet synchronous motor described in claim 5 or 6, it is characterized in that,
Above-mentioned permanent magnet synchronous motor drives the compressor that is arranged at conditioner.
9. permanent magnet synchronous motor according to claim 2, is characterized in that,
The embedded mode of imbedding the above-mentioned permanent magnet of above-mentioned rotor is U font or V font.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2012233408A JP2014087143A (en) | 2012-10-23 | 2012-10-23 | Permanent magnet synchronous motor |
| JP2012-233408 | 2012-10-23 |
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| CN103795164A true CN103795164A (en) | 2014-05-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107046353A (en) * | 2017-02-22 | 2017-08-15 | 广东美芝制冷设备有限公司 | Motor and the compressor with it |
| JP2018519782A (en) * | 2016-04-12 | 2018-07-19 | ジン−ジン エレクトリック テクノロジーズ カンパニー リミテッド | Permanent magnet motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2019030166A (en) | 2017-08-02 | 2019-02-21 | ミネベアミツミ株式会社 | motor |
| JPWO2021079508A1 (en) * | 2019-10-25 | 2021-11-18 | 三菱電機株式会社 | Electric motor |
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Also Published As
| Publication number | Publication date |
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| CN103795164B (en) | 2016-08-17 |
| JP2014087143A (en) | 2014-05-12 |
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