CN103746529A - Permanent-magnet synchronous motor, stator and rotor - Google Patents

Abstract

The present invention discloses a permanent-magnet synchronous motor using a stator of a V-shaped chute or a rotor of a V-shaped oblique pole, turning the angle of inclination along one side in the forebody of the axle, and turning the same angle of inclination along the other side in the latter part of the axle. The axial distances of the two parts are same. Due to the chute and the oblique pole of the two parts adopted different inclined directions, the additional axial forces are in reverse, so they are mutually offset on a macro level, not only the cogging torque can be removed, but also the additional pulse axial force can be removed, decreasing the noise and the vibration. The present invention also discloses a permanent-magnet synchronous motor stator and a permanent-magnet synchronous motor rotor.

Description

Permagnetic synchronous motor and stator thereof, rotor

Technical field

The present invention relates to motor, particularly a kind of permagnetic synchronous motor and stator thereof, rotor.

Background technology

The cogging torque (Cogging Torque) of permagnetic synchronous motor, or claim location torque (Detent Torque), be that teeth groove and the rotor permanent magnet of electric machine iron core interacts and the reluctance torque of generation.Due to the existence of permanent-magnetic synchronous motor stator teeth groove, when p-m rotor magnetic pole is relative with stator teeth groove during at diverse location, there is variation in the magnetic conductance of main magnetic circuit.Even motor winding no power, due to the effect of cogging torque, rotor has the trend that is parked in several settling positions on circumference.Have:

$T_{\mathrm{cog}}=\underset{k=1}{\overset{\∞}{\mathrm{\Σ}}}\sin ({\mathrm{kN}}_c\mathrm{\θ}+{\mathrm{\θ}}_k),k=\mathrm{1,2,3}...$ (formula 1)

In formula, T _cogfor cogging torque; N _cfor the least common multiple of stator tooth number Z and rotor number of poles 2p; θ is rotor mechanical position angle, is variable; θ _kfor phase angle.

When rotor rotates, cogging torque appears as a kind of additional pulsating torque, although it can not make the average torque of motor increase or reduce, it can cause velocity perturbation, motor oscillating and noise.When variable speed drives, if the frequency of cogging torque approaches system frequency, may cause resonance and intense noise.In addition, larger cogging torque also can cause electric motor starting difficulty.

In current application, the measure of reduction or elimination cogging torque has a variety of, and wherein adopting skewed slot (also can claim helical teeth, lower same) or the oblique utmost point is one of modal method.

As mentioned above, each primitive period number that produces existing cogging torque of rotor equals N _c, i.e. a mechanical angle θ corresponding to cogging torque primitive period ₁for:

θ ₁=360 °/N _c(formula 2)

Therefore, if by the teeth groove of stator core or rotor magnetic pole (torsion) tilt angle theta _sk=i θ ₁, i=1,2,3..., can eliminate the first-harmonic of cogging torque, still, selects larger i value may cause the sharply decline of motor peak performance, recommends i=1.Fig. 1 is the stator that adopts skewed slot, and Fig. 2 is the rotor that adopts the oblique utmost point.

For rotor, continuous tilt can cause the difficulties such as permanent magnet installation.In order easily to implement in manufacturing process, also can adopt rotor segment fault method for position to simulate the effect of the oblique utmost point, as shown in Figure 3, have:

(formula 3)

In formula, θ _ssfor every section of dislocation angle; N _sfor rotor segments, for guaranteeing the meaning of segmentation, should make N _s>=2.

No matter skewed stator slot, or skewed-rotor, segmentation dislocation, when eliminating cogging torque, all will produce additional axial force.Additional axial force F _asize and main torque T and skewed slot or tiltedly the angle etc. of the utmost point is relevant.Have

F _a=sign (θ _sk) f (T, θ _sk...) and (formula 4)

In formula, sign (θ _sk) for getting θ _sksymbol, under the prerequisite of the identical direction of rotation of rotor, the direction of additional axial force is relevant with the incline direction of skewed slot or the oblique utmost point.Adopt reverse skewed slot or oblique polar angle degree can cause additional axial force reverse.

In practical application, main torque often has multiple harmonic composition.Additional axial force is produced by the main torque of pulsing, and is similarly pulsating force, causes the vibration and noise of motor.When permagnetic synchronous motor adopts skewed slot or the oblique utmost point to eliminate cogging torque, produce additional pulsation axial force, caused vibration and noise.

Summary of the invention

The technical problem to be solved in the present invention is to reduce the noise and vibration of permagnetic synchronous motor.

For solving the problems of the technologies described above, permagnetic synchronous motor provided by the invention, comprises stator, rotor, stator and rotor coaxial;

Described stator, its teeth groove is V-arrangement skewed slot;

Described rotor, its magnetic pole distributes along the direction that is parallel to axle; Or

Described stator, its teeth groove distributes along the direction that is parallel to axle;

Described rotor, its magnetic pole is the oblique utmost point of V-arrangement.

Preferably, described V-arrangement skewed slot or the oblique utmost point of V-arrangement, axially first half equals the twisted tilted angle of axial latter half to a contrary side to the twisted tilted angle of a side, and the axial distance of first half, latter half equates.

Preferably, the twisted tilted angle θ of described V-arrangement skewed slot or the oblique utmost point of V-arrangement _skfor:

In formula, N _cfor the least common multiple of the stator number of teeth and rotor number of poles, i is positive integer.

Preferably, the stator number of teeth of permagnetic synchronous motor is 24, and rotor number of poles is 16, twisted tilted angle θ _skit is 7.5 °, 15 °, 22.5 °, 30 °, 37.5 ° or 45 °.

Preferably, the oblique utmost point of the V-arrangement of rotor, by N _sduan Zucheng, N _sfor being more than or equal to 3 integer.

Preferably, N _sfor being more than or equal to 3 even number;

Tiltedly every section of dislocation angle θ extremely of rotor _ssfor: j is positive integer.

Preferably, N _sfor being more than or equal to 3 odd number;

Tiltedly every section of dislocation angle θ extremely of rotor _ssfor:

J is positive integer, N _s'=N _s+ 1 or N _s'=N _s-1, and N _s'>=4.

For solving the problems of the technologies described above, permanent-magnetic synchronous motor stator provided by the invention, its teeth groove is V-arrangement skewed slot.

For solving the problems of the technologies described above, permanent-magnetic synchronous motor rotor provided by the invention, its magnetic pole is the oblique utmost point of V-arrangement.

Permagnetic synchronous motor of the present invention, adopts the stator of V-arrangement skewed slot or the rotor of the oblique utmost point of V-arrangement, at axial first half to the twisted tilted angle θ of a side _sk, at axial latter half again to the twisted tilted angle θ of a contrary side _sk, two parts axial distance equates, due to this two-part skewed slot or tiltedly the utmost point adopted different incline directions, cause the additional axial force of its generation reverse, thereby cancel out each other in macroscopic view, can both eliminate cogging torque, also eliminate additional pulsation axial force, reduced noise and vibration.

Accompanying drawing explanation

In order to be illustrated more clearly in technical scheme of the present invention, below the accompanying drawing that will use required for the present invention is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is the stator schematic diagram that adopts skewed slot;

Fig. 2 is the rotor schematic diagram that adopts the oblique utmost point;

Fig. 3 is the rotor schematic diagram that adopts the oblique utmost point of segmentation dislocation simulation;

Fig. 4 is the oblique utmost point schematic diagram of V-arrangement skewed slot or V-arrangement;

Fig. 5 is the noise contrast schematic diagram that permagnetic synchronous motor adopts respectively the common oblique utmost point and the oblique utmost point of V-arrangement;

Fig. 6 is the oblique utmost point schematic diagram of V-arrangement that is divided into the rotor of even number section;

Fig. 7 is the oblique utmost point schematic diagram of V-arrangement that is divided into the rotor of odd number section.

Embodiment

Below in conjunction with accompanying drawing, the technical scheme in the present invention is carried out to clear, complete description, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment in the present invention, all other embodiment that those of ordinary skills obtain under the prerequisite of not making creative work, belong to the scope of protection of the invention.

Embodiment mono-

Permagnetic synchronous motor, comprises stator, rotor, stator and rotor coaxial;

Described stator, its teeth groove is V-arrangement skewed slot;

Described rotor, its magnetic pole distributes along the direction that is parallel to axle; Or

Described stator, its teeth groove distributes along the direction that is parallel to axle;

Described rotor, its magnetic pole is the oblique utmost point of V-arrangement.

Preferably, described V-arrangement skewed slot or the oblique utmost point of V-arrangement, axially first half equals the twisted tilted angle of axial latter half to a contrary side to the twisted tilted angle of a side, and the axial distance of first half, latter half equates.

The permagnetic synchronous motor of embodiment mono-, as shown in Figure 4, adopts the stator of V-arrangement skewed slot or the rotor of the oblique utmost point of V-arrangement, at axial first half to the twisted tilted angle θ of a side _sk, at axial latter half again to the twisted tilted angle θ of a contrary side _sk, two parts axial distance equates, due to this two-part skewed slot or tiltedly the utmost point adopted different incline directions, cause the additional axial force of its generation reverse, thereby cancel out each other in macroscopic view.The permagnetic synchronous motor of embodiment mono-, adopts the stator of V-arrangement skewed slot or the rotor of the oblique utmost point of V-arrangement, can both eliminate cogging torque, also eliminates additional pulsation axial force, has reduced noise and vibration.Fig. 5 is the noise contrast that certain permagnetic synchronous motor adopts respectively the common oblique utmost point and the oblique utmost point of V-arrangement.

Can on average divide vertically the permagnetic synchronous motor that adopts the stator of V-arrangement skewed slot or the rotor of the oblique utmost point of V-arrangement into two parts, every part is considered as a micro-machine, micro-machine is inner for adopting common skewed slot or the oblique utmost point mode to lopsidedness, for First micro-machine wherein, the additional axial force F of its generation _a1for:

$F_{\mathrm{al}}=\mathrm{sign}\left({\mathrm{\&theta;}}_{\mathrm{sk}}\right)f({\mathrm{<figure-callout\; id="1"\; label="T"\; filenames="HDA0000448266060000041.png"\; state="\{\{state\}\}">T</figure-callout>}}_1,{\mathrm{\&theta;}}_{\mathrm{sk}},...)=f(\frac{\mathrm{<figure-callout\; id="2"\; label="T"\; filenames="HDA0000448266060000041.png"\; state="\{\{state\}\}">T</figure-callout>}}{2},{\mathrm{\&theta;}}_{\mathrm{sk}},...)$ (formula 5)

In formula, T ₁for the main torque of First micro-machine.

Second micro-machine performance is identical with First micro-machine, and just incline direction is contrary, for-θ _sk, the additional axial force F of its generation _a2for:

$F_{a2}=\mathrm{sign}(-{\mathrm{\&theta;}}_{\mathrm{sk}})f({\mathrm{<figure-callout\; id="2"\; label="T"\; filenames="HDA0000448266060000041.png"\; state="\{\{state\}\}">T</figure-callout>}}_2,{\mathrm{\&theta;}}_{\mathrm{sk}},...)=-f(\frac{\mathrm{<figure-callout\; id="2"\; label="T"\; filenames="HDA0000448266060000041.png"\; state="\{\{state\}\}">T</figure-callout>}}{2},{\mathrm{\&theta;}}_{\mathrm{sk}},...)$ (formula 6)

In formula, T ₂it is the main torque of second micro-machine.

Two synthetic additional axial force F that micro-machine produces _afor:

F _a=F _a1+ F _a2=F _a1+ (F _a1)=0 (formula 7)

Can find out, adopt in theory the additional axial force of permagnetic synchronous motor of the stator of V-arrangement skewed slot or the rotor of the oblique utmost point of V-arrangement to be completely eliminated.

Embodiment bis-

Based on the permagnetic synchronous motor of embodiment mono-, the twisted tilted angle θ of described V-arrangement skewed slot or the oblique utmost point of V-arrangement _skfor:

(formula 8)

In formula, N _cfor the least common multiple of stator tooth number Z and rotor number of poles 2p, i is positive integer.But, select larger i value may cause the sharply decline of motor peak performance, recommend i=1.

For example, certain permagnetic synchronous motor intends adopting the stator scheme of V-arrangement skewed slot, its stator number of teeth Z=24, rotor number of poles 2p=16, its tilt angle theta _skfor:

i desirable 1,2,3,4,5,6 ..., θ _skdesirable 7.5 °, 15 °, 22.5 °, 30 °, 37.5 °, 45 ° ...

Embodiment tri-

Based on the permagnetic synchronous motor of embodiment mono-, as shown in Figure 6, Figure 7, the oblique utmost point of the V-arrangement of rotor, by N _sduan Zucheng, N _sfor being more than or equal to 3 integer.

The permagnetic synchronous motor of embodiment tri-, makes the oblique utmost point V-arrangement segmentation dislocation of rotor, can imitate the oblique utmost point of V-arrangement.In order to guarantee the counteracting completely of additional axial force, the segments N of rotor _sshould be chosen as even number as far as possible, for guaranteeing the meaning of segmentation, when Ns is even number, should have Ns>=3, as shown in Figure 6, should make tiltedly every section of dislocation angle θ extremely of rotor _ssfor:

(formula 9)

But, select larger j value may cause the sharply decline of motor peak performance, recommend j=1.

For example, certain permagnetic synchronous motor intends adopting the oblique utmost point V-arrangement segmentation dislocation scheme of rotor, its stator number of teeth Z=36, rotor number of poles 2p=24, the segments N of rotor _severy section of dislocation angle θ of=6 rotors _ssfor:

θ _ssdesirable 1.6667 °, 3.3333 °, 5 ° ...

If while using the method for Rotor V shape segmentation dislocation, because of practical application condition N _scannot get even number, for guaranteeing the meaning of segmentation, when Ns is odd number, should have Ns>=3, as shown in Figure 7, should shilling N _s'=N _s+ 1 or N _s'=N _s-1 obtains even number N _s', and N _s'>=4, every section of dislocation angle θ of rotor now _ssfor:

(formula 10)

It should be noted that under this applicable cases, because the oblique utmost point of V-arrangement of rotor is not on average divided into two sections, cause cogging torque and additional axial force to be completely eliminated.

The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.

Claims (21)

1. a permagnetic synchronous motor, comprises stator, rotor, stator and rotor coaxial; It is characterized in that,

Described stator, its teeth groove is V-arrangement skewed slot;

Described rotor, its magnetic pole distributes along the direction that is parallel to axle; Or

Described stator, its teeth groove distributes along the direction that is parallel to axle;

Described rotor, its magnetic pole is the oblique utmost point of V-arrangement.

2. permagnetic synchronous motor according to claim 1, is characterized in that,

Described V-arrangement skewed slot or the oblique utmost point of V-arrangement, axially first half equals the twisted tilted angle of axial latter half to a contrary side to the twisted tilted angle of a side, and the axial distance of first half, latter half equates.

3. permagnetic synchronous motor according to claim 2, is characterized in that,

The twisted tilted angle θ of described V-arrangement skewed slot or the oblique utmost point of V-arrangement _skfor:

In formula, N _cfor the least common multiple of the stator number of teeth and rotor number of poles, i is positive integer.

4. permagnetic synchronous motor according to claim 3, is characterized in that, i is 1.

5. permagnetic synchronous motor according to claim 3, is characterized in that,

The stator number of teeth of permagnetic synchronous motor is 24, and rotor number of poles is 16, twisted tilted angle θ _skit is 7.5 °, 15 °, 22.5 °, 30 °, 37.5 ° or 45 °.

6. permagnetic synchronous motor according to claim 3, is characterized in that, the oblique utmost point of V-arrangement of rotor, by N _sduan Zucheng, N _sfor being more than or equal to 3 integer.

7. permagnetic synchronous motor according to claim 6, is characterized in that, N _sfor being more than or equal to 3 even number;

Tiltedly every section of dislocation angle θ extremely of rotor _ssfor:

j is positive integer.

8. permagnetic synchronous motor according to claim 6, is characterized in that, N _sfor being more than or equal to 3 odd number;

Tiltedly every section of dislocation angle θ extremely of rotor _ssfor:

J is positive integer, N _s'=N _s+ 1 or N _s'=N _s-1, and N _s'>=4.

9. according to claim 7 or described permagnetic synchronous motor, it is characterized in that, j is 1.

10. a permanent-magnetic synchronous motor stator, is characterized in that,

Described stator, its teeth groove is V-arrangement skewed slot.

11. permanent-magnetic synchronous motor stators according to claim 10, is characterized in that,

Described V-arrangement skewed slot, axially first half equals the twisted tilted angle of axial latter half to a contrary side to the twisted tilted angle of a side, and the axial distance of first half, latter half equates.

12. permanent-magnetic synchronous motor stators according to claim 11, is characterized in that,

The twisted tilted angle θ of described V-arrangement skewed slot _skfor:

In formula, N _cfor the least common multiple of the stator number of teeth and rotor number of poles, i is positive integer.

13. permanent-magnetic synchronous motor stators according to claim 12, is characterized in that, i is 1.

14. 1 kinds of permanent-magnetic synchronous motor rotors, is characterized in that,

Described rotor, its magnetic pole is the oblique utmost point of V-arrangement.

15. permanent-magnetic synchronous motor rotors according to claim 14, is characterized in that,

The oblique utmost point of described V-arrangement, axially first half equals the twisted tilted angle of axial latter half to a contrary side to the twisted tilted angle of a side, and the axial distance of first half, latter half equates.

16. permanent-magnetic synchronous motor rotors according to claim 15, is characterized in that,

The twisted tilted angle θ of the oblique utmost point of described V-arrangement _skfor:

In formula, N _cfor the least common multiple of the stator number of teeth and rotor number of poles, i is positive integer.

17. permanent-magnetic synchronous motor rotors according to claim 16, is characterized in that, i is 1.

18. permanent-magnetic synchronous motor rotors according to claim 16, is characterized in that, the oblique utmost point of V-arrangement of rotor, by N _sduan Zucheng, N _sfor being more than or equal to 3 integer.

19. permanent-magnetic synchronous motor rotors according to claim 18, is characterized in that N _sfor being more than or equal to 3 even number;

Tiltedly every section of dislocation angle θ extremely of rotor _ssfor: j is positive integer.

20. permanent-magnetic synchronous motor rotors according to claim 18, is characterized in that,

N _sfor being more than or equal to 3 odd number;

Tiltedly every section of dislocation angle θ extremely of rotor _ssfor:

J is positive integer, N _s'=N _s+ 1 or N _s'=N _s-1, and N _s'>=4.

21. according to the permanent-magnetic synchronous motor rotor described in claim 19 or 20, it is characterized in that, j is 1.

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