CN101572449A - Core rotor of doubly-salient motor - Google Patents

Abstract

The invention discloses a core rotor of a doubly-salient motor. The salient-pole type core rotor is formed by axially laminating n sections of silicon-steel sheets with different tooth widths which are respectively set as beta1, beta2, ... and betan, and the axial lengths corresponding to the tooth widths thereof in each section are set as L1, L2,... and Ln respectively, then, the tooth widths and the axial lengths in each section satisfy the lower right formula; the positions where the different tooth widths in n sections are located are axially symmetrical about the plane of the center point; and the axial lengths corresponding to the tooth widths in the n sections are axially symmetrical about the plane of the center point. By combining the large and small axial teeth of a rotor core, the invention can weaken the torque ripple of the motor, promote the running stability of the motor and reduce the noise and vibration of the motor.

Description

The core rotor of double salient-pole electric machine

Technical field

The present invention relates to double salient-pole electric machine, belong to the motor manufacturing technology field.

Background technology

Motor is a requisite pith in the drive system, and the motor of superior performance can make whole drive system that more wide application prospect is arranged.Double salient-pole electric machine is the relatively unique motor of a class, and its stator and rotor all adopt salient-pole structure.Common double salient-pole electric machine comprises switched reluctance machines, permanent-magnet type switched reluctance machines (also claiming doubly salient permanent magnet motor), permanent-magnetic-switch flux linkage motor (also claiming flux switch permanent magnet motor), composite excitation switch magnetic-linkage motor and magnetic linkage counter-rotating magneto etc.The double salient-pole electric machine that also has some other forms or title.The common ground of this class double salient-pole electric machine is all to adopt salient pole type core rotor (Fig. 1).Rotor is only formed by silicon steel plate stacking, without any the winding of form, permanent magnet, slip ring etc.The salient pole type core rotor has advantages such as simple in structure, firm, that fault-tolerant ability is strong.Can be internal rotor, also can be external rotor; Can be the straight-tooth form, also can be the helical teeth form; Adjacent two teeth can be wide (also claiming circumferentially evenly tooth), also can be not wide (also claiming the circumferential extent tooth); The circumferential distribution of rotor tooth can be uniformly, also can be uneven.But traditional salient pole type core rotor has a common ground, and being exactly any one tooth axially all is being even width.

The biconvex electrode structure of this type of motor makes the output torque have flutter component, produces vibration and noise then, causes the motor operation to worsen, and then influences the control performance of whole system.Can have a strong impact on motor properties when torque pulsation is excessive, even cause the motor can't operate as normal.Therefore, the high-performance motor must weaken torque pulsation as much as possible.At present, weaken torque pulsation, but often also can reduce effective torque simultaneously, perhaps influence the dynamic balance performance of rotor by the design meanses such as circumferential uneven distribution that the salient pole type core rotor carried out helical teeth, circumferential extent tooth, tooth.

Summary of the invention

The objective of the invention is to propose a kind of core rotor that can effectively weaken the double salient-pole electric machine of torque pulsation.

The core rotor of double salient-pole electric machine of the present invention, its salient pole type core rotor is formed by the silicon steel plate stacking of the different facewidth of axial n section, establishes the n section facewidth and is respectively: β ₁, β ₂..., β _n, and the pairing axial length of each section facewidth is respectively: L ₁, L ₂..., L _n, then the facewidth of each section and length satisfy:

$\left\{\begin{array}{c}{T}_{t\_\mathrm{ripple}}=\underset{i}{\mathrm{\Σ}}{L}_i\underset{n}{\mathrm{\Σ}}T\left({\mathrm{\β}}_n\right)\\ =\underset{i}{\mathrm{\Σ}}{L}_i\underset{n}{\mathrm{\Σ}}\underset{k}{\mathrm{\Σ}}{T}_{\mathrm{nk}}\sin (\mathrm{k\θ}+{\mathrm{\θ}}_{\mathrm{nk}})\\ =\min \\ L=\underset{i}{\mathrm{\Σ}}{L}_i\end{array}\right.$

Wherein, T _NkFacewidth β under the representation unit length _nThe k order harmonic components amplitude of the torque pulsation under corresponding; θ represents relative position between the rotor; L represents the axial length that the pole core rotor is total; θ _NkFacewidth β under the representation unit length _nThe k order harmonic components phase angle of the torque pulsation under corresponding; T _{T_ripple}Represent total pulsating torque; Min is a minimum value;

The residing position of the different facewidth of said n section is about the axial midpoint plane symmetry, and the pairing axial length of the different facewidth of n section is about the axial midpoint plane symmetry.

Beneficial effect of the present invention:

The present invention is simple in structure, is easy to realize, by the combination of rotor core axial extent tooth, can weaken motor torque ripple, improves the motor operation stability, reduces noise of motor and vibration, makes double salient-pole electric machine obtain broader applications in every field.

Description of drawings

Fig. 1 is traditional salient pole type core rotor schematic diagram;

Fig. 2 is the core rotor schematic diagram of double salient-pole electric machine of the present invention;

Fig. 3 is a kind of instantiation schematic diagram of the present invention;

Fig. 4 is the output torque oscillogram of salient pole type core rotor, wherein (a) is the output torque oscillogram that 17.5 degree produce for traditional salient pole type core rotor facewidth, (b), (c) be the output torque oscillogram of the salient pole type core rotor generation of Fig. 3 example for traditional salient pole type core rotor facewidth is the output torque oscillogram that 23.5 degree produce.

Embodiment

With reference to Fig. 2, the core rotor of double salient-pole electric machine of the present invention is formed by the silicon steel plate stacking of the different facewidth of axial n section, establishes the n section facewidth and is respectively: β ₁, β ₂..., β _n, and the pairing axial length of each section facewidth is respectively: L ₁, L ₁..., L _n, then the facewidth of each section and length satisfy:

$\left\{\begin{array}{c}{T}_{t\_\mathrm{ripple}}=\underset{i}{\mathrm{\Σ}}{L}_i\underset{n}{\mathrm{\Σ}}T\left({\mathrm{\β}}_n\right)\\ =\underset{i}{\mathrm{\Σ}}{L}_i\underset{n}{\mathrm{\Σ}}\underset{k}{\mathrm{\Σ}}{T}_{\mathrm{nk}}\sin (\mathrm{k\θ}+{\mathrm{\θ}}_{\mathrm{nk}})\\ =\min \\ L=\underset{i}{\mathrm{\Σ}}{L}_i\end{array}\right.$

Wherein, T _NkFacewidth β under the representation unit length _nThe k order harmonic components amplitude of the torque pulsation under corresponding; θ represents relative position between the rotor; L represents the axial length that the pole core rotor is total; θ _NkFacewidth β under the representation unit length _nThe k order harmonic components phase angle of the torque pulsation under corresponding; T _{T_ripple}Represent total pulsating torque; Min is a minimum value.

The residing position of the different facewidth of said n section is about the axial midpoint plane symmetry, and the pairing axial length of the different facewidth of n section is about the axial midpoint plane symmetry.

In the legend, core rotor has the facewidth to equal β ₁, β ₂, β ₃, β ₄Four kinds of silicon steel sheets; The facewidth equals β ₁Silicon steel plate stacking the 2 iron leg hearts (promptly 1.1 and 1.7), the facewidth equals β ₂Silicon steel plate stacking 2 sections stack of laminations (promptly 1.2 and 1.6), the facewidth equals β ₃Silicon steel plate stacking the 2 iron leg hearts (promptly 1.3 and 1.5), the facewidth equals β ₄Silicon steel plate stacking the 1 iron leg heart (promptly 1.4).Stack of lamination 1.1 and stack of lamination 1.7 residing positions are about the axial midpoint plane symmetry, and stack of lamination 1.1 and stack of lamination 1.7 pairing axial lengths are about the axial midpoint plane symmetry; Same, stack of lamination 1.2 and stack of lamination 1.6 residing positions and axial length are also about the axial midpoint plane symmetry; Stack of lamination 1.3 and stack of lamination 1.5 residing positions and axial length are also about the axial midpoint plane symmetry.Stack of lamination 1.4 is positioned at the middle of axle, only is one section, and himself is too about the mid point plane symmetry of axle.

Fig. 3 is a kind of instantiation of the present invention, in this example, core rotor by axial 5 sections the silicon steel sheet of totally two kinds of facewidth be overrided to form first section facewidth β successively ₁Be 23.5 degree, length L ₁Be 12mm; Second section facewidth β ₂Be 17.5 degree, length L ₂Be 12mm; The 3rd section facewidth β ₃Be 23.5 degree, length L ₃Be the 4th section facewidth β of 12mm ₄Be 17.5 degree, length L ₄Be 12mm; The 5th section facewidth β ₅Be 23.5 degree, length L ₅Be 12mm, the facewidth of each section and length satisfy:

$\left\{\begin{array}{c}{T}_{t\_\mathrm{ripple}}=\underset{i=\mathrm{1,2},...}{\overset{5}{\mathrm{\Σ}}}{L}_i\underset{n=\mathrm{1,2},...}{\overset{5}{\mathrm{\Σ}}}\underset{k=\mathrm{1,2},...}{\overset{5}{\mathrm{\Σ}}}{T}_{\mathrm{nk}}\sin (\mathrm{k\θ}+{\mathrm{\θ}}_{\mathrm{nk}})\\ =12*(-0.4)/60+12*0.6/60+\\ 12*(-0.4)/60+12*0.6/60+12*(-0.4)/60\\ =0\\ L=12+12+12+12+12=60\mathrm{mm}\end{array}\right.$

The output torque waveform that the salient pole type core rotor of invention and traditional salient pole type core rotor produce is relatively seen Fig. 4.The salient pole type core rotor of traditional even facewidth, the rotor facewidth are that the effective torque of 17.5 degree is 3Nm, and the peak-to-peak value of torque pulsation is that (figure a) for 0.6N.m; The rotor facewidth be the effective torques of 23.5 degree also for 3Nm, the peak-to-peak value of torque pulsation is 0.4N.m (figure b), and the torque pulsation component is that 17.5 situations about spending are opposite phase with the facewidth, promptly is equivalent to-0.4N.m.After adopting the salient pole type core rotor of Fig. 3 example, effective output torque of motor is still 3Nm, but torque pulsation is reduced to only 0.04Nm (figure c).This shows that the present invention can obviously weaken motor torque ripple, improve the motor operation stability, thereby reduce noise of motor and vibration.

Claims (1)

1. the core rotor of double salient-pole electric machine is characterized in that the salient pole type core rotor is formed by the silicon steel plate stacking of the different facewidth of axial n section, establishes the n section facewidth and is respectively: β ₁, β ₂..., β _n, and the pairing axial length of each section facewidth is respectively: L ₁, L ₂..., L _n, then the facewidth of each section and length satisfy:

$\left\{\begin{array}{c}{T}_{t\_\mathrm{ripple}}=\underset{i}{\mathrm{\Σ}}{L}_i\underset{n}{\mathrm{\Σ}}T\left({\mathrm{\β}}_n\right)\\ =\underset{i}{\mathrm{\Σ}}{L}_i\underset{n}{\mathrm{\Σ}}\underset{k}{\mathrm{\Σ}}{T}_{\mathrm{nk}}\sin (\mathrm{k\θ}+{\mathrm{\θ}}_{\mathrm{nk}})\\ =\min \\ L=\underset{i}{\mathrm{\Σ}}{L}_i\end{array}\right.$

Wherein, T _NkFacewidth β under the representation unit length _nThe k order harmonic components amplitude of the torque pulsation under corresponding; θ represents relative position between the rotor; L represents the axial length that the pole core rotor is total; θ _NkFacewidth β under the representation unit length _nThe k order harmonic components phase angle of the torque pulsation under corresponding; T _{T_ripple}Represent total pulsating torque; Min is a minimum value;

The residing position of the different facewidth of said n section is about the axial midpoint plane symmetry, and the pairing axial length of the different facewidth of n section is about the axial midpoint plane symmetry.

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