CN207719905U - A kind of disc-type permanent magnet motor and rotor - Google Patents

Abstract

The utility model discloses a kind of disc-type permanent magnet motor and rotors, wherein rotor, including several magnetic poles circumferentially arranged and use oblique pole mode, at each radial position of same magnetic pole, using the midpoint in circumferential direction as reference point, circumferential offset angle between maximum two reference point of circumferential span is peak excursion angle θ, and meets (36 °/p)<θ<(90 °/p), wherein p are motor number of pole-pairs.The utility model disc-type permanent magnet motor and rotor use oblique pole mode, in a certain range by the control of oblique polar angle degree, the harmonic component of electromagnetic force can be effectively reduced, to reduce electromagnetic noise.

Description

A kind of disc-type permanent magnet motor and rotor

Technical field

The utility model is related to technical field of motors, more particularly to using the disc type electric machine and its rotor of oblique pole mode.

Background technology

Disc-type permanent magnet motor is a kind of permanent magnet synchronous motor of axial magnetic field, very suitable due to its flat structure feature Conjunction requires installation dimension high occasion.Typical disc type electric machine structure includes single stator single rotor, bimorph transducer single rotor form. Air gap is a flat surface, and perpendicular to rotation center.

How to effectively control the electromagnetic noises of disc-type permanent magnet motor into the key factor of this motor manufacturing.Electromagnetic noise It is a comprehensive very strong challenge, currently, this problem once occurs in motor product, main means are that modification slot number is matched It closes, using magnetic slot-seal, checks the concentricity of rotary part, increase air gap, change electromagnetic scheme (winding configuration, parallel branch Number), increase engine base, yoke portion intensity etc..Any type method is all very great project setting for motor, involved It does over again and handles all to be no less than and make a motor again.

Such as the use of magnetic slot-seal, often there was only small influence to motor electromagnetic noise, it many times can not be straight It connects and is effectively reduced noise.The less use in motor actual product of such mode.

Check the concentricity of motor rotary part, such mode means most-often used after the appearance of motor electromagnetic noise. It is primarily due to motor processing technology, the influence of tolerance fit generates bias in air gap, increases to cause non-uniform air-gap Unilateral magnetic force generates electromagnetic noise.But many times electromagnetic noise might not be thus, it is possible to reduce, this is intended only as The initial means of investigation are examined in product quality review, cannot effectively reduce the electromagnetic noise of motor.

Increase air gap method, re-worked using stator and rotor, motor gas-gap flux density is reduced, to reduce electromagnetic noise.This Method can reduce electromagnetic noise for the sufficiently large motor of design margin on the basis of ensureing performance, but for design Surplus is insufficient, may bring the risk of performance depreciation.In addition, re-working iron filings caused by stator and rotor etc., there are destruction motors The risk of insulation.

Electromagnetic scheme is changed, increases the methods of engine base, yoke portion intensity, all the global design of motor is adjusted, electricity Therefore the critical pieces such as punching, winding, the engine base of machine all need to re-mold processing, and the material cost of motor is therefore big It is big to increase.

Utility model content

The utility model provides a kind of disc-type permanent magnet motor using oblique pole mode, is controlled in certain model by oblique polar angle degree In enclosing, it can be effectively reduced the harmonic component of electromagnetic force, to reduce electromagnetic noise.

A kind of rotor for disc-type permanent magnet motor, including several magnetic poles for circumferentially arranging and oblique pole mode is used, together At each radial position of one magnetic pole, using the midpoint in circumferential direction as reference point, the week between maximum two reference point of circumferential span It is peak excursion angle θ to deviation angle, and meets (36 °/p)<θ<(90 °/p), wherein p are motor number of pole-pairs.

In disc-type permanent magnet motor, in the case that stator is not using oblique pole or even if being adapted to using oblique pole but deviation angle, It can mainly consider to handle using oblique pole at rotor position, for the ease of describing and expressing the trend of oblique pole, the utility model passes through Circumferential offset angle between two reference points characterizes, any one reference point is located at circumferential on the radial position of residing magnetic pole Midpoint, all reference points connection on some magnetic pole can be formed into center line, since pole form is variable, center line can be straight Line, camber line or other forms, the circumferential offset between any two reference point, can embody oblique pole trend, and circumferential offset is bigger, And institute is bigger across the corresponding central angle of camber line in circumferential direction, and it is larger inclined to can be considered that magnetic pole has at the position between two reference points It moves, otherwise similarly.

In order to reduce electromagnetic noise, oblique pole offset should be in suitable range, that is, when being offset to trend maximum, it should have enough Circumferential span, the circumferential offset angle in the utility model on same magnetic pole between maximum two reference point of circumferential span is maximum Deviation angle θ, by the range restriction to peak excursion angle θ, to ensure that oblique pole deviates the noise reduction brought.

Preferably, the magnetic pole is magnet steel, the reference point is located at magnet steel in the projection of shape of motor axial direction.

Preferably, the magnetic pole is winding wire slot, the reference point is located at the areas adjacent two winding wire slots center line Suo Wei Domain is in the projection of shape along motor axial direction.

In disc type electric machine there are two types of common magnetic pole forms, that is, it is used for the winding wire slot of coil and the magnetic of sheet around the home Steel, and rotor and stator alternatively use, for example, when rotor magnetic pole uses magnet steel, in corresponding disc type electric machine, stator Magnetic pole is then by the way of winding wire slot；As a same reason, fixed when rotor magnetic pole uses winding wire slot in corresponding disc type electric machine Sub- magnetic pole is then by the way of magnet steel.

The magnetic pole referred in the utility model, rotor magnetic pole, magnetic pole of the stator it is clearly limit under, be interpreted as magnet steel or Winding wire slot, and rotor magnetic pole is matched with magnetic pole of the stator in use, then one be magnet steel, another one is winding wire slot.

Both the above situation is all directed at survey calculation circumferential offset angle in the projection of shape of motor axial direction, Since the circumferential offset between two reference points has corresponded to a specific central angle, and the rotation without considering rotor Direction and the numerical value brought are positive and negative.

The selection of reference point is related to the residing midpoint of radial position in the circumferential, and magnet steel is i.e. according to itself outer profile Projection of shape determines the circumferential midpoint of corresponding position；

And when for winding wire slot, it is first determined adjacent two winding wire slots center line, at certain radial position, with this two Circumferential midpoint between center line is as reference point.

Preferably, each magnetic pole is structure as a whole or multiple sub- magnetic pole units including radially arranging successively.

It, can be according to the prior art using integrated or separately structure, by taking magnet steel as an example, one for each magnetic pole itself Body structure is convenient for global formation and assembly, and separate structure, convenient for modularization and adjustment, is fitted i.e. radially by spliced together Answering property is slightly strong, but when use separate structure, when considering reference point and circumferential offset, it should which entirety is treated, i.e. certain sub- magnetic It may not handle oblique pole in pole unit, but be arranged using oblique pole mode between multiple sub- magnetic pole units, i.e., central point has week To dislocation, noise reduction just can be improved at this time.

In rotor rotation direction, the leading edge or back edge of magnetic pole are straight line, camber line, are formed by connecting by multistage arc Curve, the broken line being formed by connecting by multistage straight line are combined the irregular line being formed by connecting by straight line and curve.

The edge of magnetic pole generally comprises inward flange and outer edge radially；And the front in rotor rotation direction Edge or back edge, inward flange and outer edge are absolute positional relations, and leading edge and back edge according to rotation direction difference only It is relative concept, equivalence is also considered as even if exchanging.

Preferably, the magnetic pole is V-arrangement, the inflection point of V-arrangement is located at the middle part of magnetic pole radial.

The utility model, which has, preferably uses V-arrangement magnetic pole, and the inflection point of V-arrangement is located at the middle part of magnetic pole radial, but does not want strictly The midpoint of Seeking Truth radial direction, such as radially within the 20% of midpoint both sides deviation magnetic pole overall radial dimension.V-arrangement under normal circumstances Inflection point position, inward flange or outer edge relative to magnetic pole have maximum circumferential offset angle.

The utility model also provides a kind of disc-type permanent magnet motor, includes the stator and rotor of axially opposed arrangement, stator Include several magnetic poles for circumferentially arranging with rotor, magnetic pole of the stator and rotor magnetic pole are in the corresponding at least part of radial position Region is oblique polar region, and in oblique polar region, the difference of the deviation angle of magnetic pole of the stator and rotor magnetic pole is θ 1, and meets (36 °/p)<θ1< (90 °/p), wherein p are motor number of pole-pairs；

The deviation angle is in the oblique polar region of same magnetic pole, and oblique polar region outer edge midpoint is relative to inward flange midpoint in rotor Deviation angle in rotation direction.

In rotor described in the utility model, the feelings of oblique pole can not be used in stator by the restriction of peak excursion angle θ Under condition, so that it may to obtain the effect of noise reduction, if generally speaking with motor, if stator use oblique pole mode, rotor tiltedly extremely partially Shifting amplitude is considered as the relative value with the oblique pole offset amplitude of stator.

Oblique polar region refers to magnetic pole of the stator and the common radial position region of rotor magnetic pole, and magnetic pole of the stator is with rotor magnetic pole at this Region be relatively oblique pole, can be the only oblique pole of stator, or only skewed-rotor, or both oblique pole.

Especially at both oblique pole, it is assumed that magnetic pole inward flange aligns, then the offset side of outer edge circumferentially Formula can be identical or different, thus on the basis of edge mid-points, outer peripheral deviation angle is that had numerically according to direction Positive and negative point, then calculates the difference of the deviation angle of magnetic pole of the stator and rotor magnetic pole again.

Deviation angle of the scheme China and foreign countries edge mid-points relative to inward flange midpoint in rotor rotation direction, only relatively For, such as inward flange midpoint is also as a same reason relative to deviation angle of the outer edge midpoint in rotor rotation direction.

Preferably, on same magnetic pole, 50% or more of magnetic pole radial length where all oblique polar regions account for.

Oblique polar region can extend entire pole regions radially, can also be only subregion, oblique for ease of calculating The deviation angle of magnetic pole of the stator and rotor magnetic pole in polar region is generally divided in the case where pole form is irregular or has apparent inflection point Oblique polar region, each tiltedly polar region shape is relatively regular, so under normal circumstances the oblique polar region outer edge midpoint relative to inward flange Peak excursion angle in deviation angle namely oblique polar region of the midpoint in rotor rotation direction, because in outer edge midpoint and inward flange Point as both for reference point, the circumferential span in oblique polar region is maximum, this also in rotor described in the utility model, it is related The method of determination of peak excursion angle θ is corresponding.

Preferably, tiltedly in polar region, only rotor magnetic pole uses oblique polar form, i.e. magnetic pole of the stator deviation angle is 0 °；Or it is only fixed Sub- magnetic pole uses oblique polar form, i.e. rotor magnetic pole deviation angle is 0 °.

For magnetic pole of the stator with rotor magnetic pole, only one uses oblique pole, problem relative simplicity.

Preferably, disc-type permanent magnet motor described in the utility model is using described in the utility model electric for desk permanent-magnet The rotor of machine, and only rotor magnetic pole uses oblique polar form.

The utility model can quickly and efficiently handle motor electromagnetic noise problem, to avoid previous processing mode It is insufficient, it is not necessary to try to gather the electromagnetic scheme of different slot numbers cooperations again, because, the scheme modifying of motor slot number cooperation, for motor For stator and rotor punching, winding, the critical pieces such as magnet steel will remanufacture, and for original scheme, calculate difference Product.Therefore, the range of modification is excessive, and cannot be guaranteed that modified scheme does not just have electromagnetic noise problem, needs anti- Retrial is gathered, and model machine is excessive, and product development cycle is long.

Description of the drawings

Fig. 1 is the schematic diagram of stator and rotor in the utility model disc-type permanent magnet motor；

Fig. 2 is rotor structure schematic diagram；

Fig. 3 is the structural schematic diagram of another rotor；

Fig. 4 is the structural schematic diagram of the third rotor；

Fig. 5 is the structural schematic diagram of portion magnetic pole in Fig. 2 rotors；

Fig. 6 is the structural schematic diagram of portion magnetic pole in Fig. 4 rotors；

Fig. 7 is the structural schematic diagram of portion magnetic pole in Fig. 5 rotors；

Fig. 8 is the principle schematic of magnetic pole of the stator corresponding with Fig. 7 rotors；

Fig. 9 is the noise of motor analysis schematic diagram before being not optimised；

Figure 10 be the utility model disc-type permanent magnet motor in using tiltedly extremely after noise of motor analyze schematic diagram.

Specific implementation mode

Referring to Fig. 1, the utility model disc-type permanent magnet motor includes mutually matched rotor 2 and stator 1, other circumferential components It can be according to prior art arrangement, if stator 1 carries the main slot that circumferentially arranges in Fig. 1, for coil around the home, in the present embodiment Stator 1 only uses oblique pole mode there is no oblique pole mode is used at rotor.

It is one of the form of rotor in Fig. 2, magnetic pole uses magnet steel 3.

Fig. 3 is another form of rotor, and the constituted mode of magnetic pole is winding wire slot 4, and when use matches corresponding windings, in figure Omit winding；

Visible two adjacent winding wire slot, respectively winding wire slot 4a and winding wire slot 4b in Fig. 3 are between adjacent winding wire slot Teeth portion 4c.

Fig. 4 is another form of rotor, and magnetic pole uses magnet steel 5.

In Fig. 2 and Fig. 3, in rotor rotation direction, the leading edge or back edge of magnetic pole are straight line.Turn in rotor in Fig. 4 On dynamic direction, the leading edge or back edge of magnetic pole are broken line, and magnet steel 5 is V-arrangement on the whole, and inflection point 5a is located in magnetic pole radial Portion, inflection point 5a may be magnetic pole overall radial dimension to the deviation of radially opposite sides relative to radial midpoint under normal circumstances Within 20%.

Referring to Fig. 5, magnet steel 3 is in oblique polar region on the whole, has between outer edge midpoint and inward flange midpoint maximum Circumferential offset distance, deviation angle calculation are：

Inward flange midpoint A is as the first reference point；

Outer edge midpoint B is as the second reference point；

There is line L, if not using oblique pole mode, line L is directed toward center of circle O, i.e. outer edge midpoint B phases between two reference points Outer edge midpoint A is not deviated, line L radiuses R is overlapped.

And oblique pole then line L Off-Radials are used, institute's span is used as partially two reference points from corresponding central angle θ in the circumferential Angle is moved, and meets (36 °/p)<θ<(90 °/p), wherein p are motor number of pole-pairs.

θ=8p=10 in Fig. 5, the condition requirement in coincidence formula.

When using winding wire slot mode in Fig. 6, computational methods are similarly.In conjunction with Fig. 3, the center line L1 of winding wire slot 4a, around The center line L2 of group wire casing 4b, reference point is chosen in the region between center line L1 and center line L2, in the region inner margin Point A is as the first reference point；Outer edge midpoint B is as the second reference point；There is line L between two reference points, be computed rear θ=8p =10, the condition requirement in coincidence formula.

Referring to Fig. 7, since in Fig. 5 and Fig. 6, with radial extension, oblique pole offset amplitude is gradually increased, therefore arrives magnetic pole Outer edge when, that is, corresponded to peak excursion angle, and extension radial in Fig. 7, oblique pole offset amplitude are that have significant change section , since magnet steel 5a is generally V-shape, it is seen that with extending radially outwardly, counterclockwise before this, arrival is turned for oblique pole offset direction After point 5a, oblique pole offset direction and clockwise on the basis of inflection point 5a, therefore in general, relative to outside magnetic pole Edge or inward flange, the positions inflection point 5a have peak excursion angle.

Magnetic pole inward flange midpoint A, outer edge midpoint B, the midpoint C at inflection point position, as inward flange midpoint A and midpoint C it Between deviation angle；And the deviation angle between outer edge midpoint B and midpoint C；Which bigger of the two then needs to calculate separately to compare, this The maximum therein is only considered in utility model scheme, need to be met (36 °/p)<θ<(90°/p).Inward flange midpoint in the present embodiment Deviation angle between A and midpoint C is maximum, and θ=8p=10, the condition requirement in coincidence formula.

If only rotor magnetic pole uses oblique polar form, i.e. magnetic pole of the stator deviation angle is 0 °, problem relative simplicity.If only stator Using oblique pole mode, technology of the magnetic pole of the stator in relation to deviation angle calculates identical as rotor magnetic pole.

If magnetic pole of the stator and rotor magnetic pole are all made of oblique pole mode, need to calculate separately then to compare and obtain difference, it is maximum Difference θ 1 meets (36 °/p)<θ1<(90 °/p), wherein p are motor number of pole-pairs；

Due to magnetic pole of the stator and rotor magnetic pole shape and irregular, it may be used and choose a part radially, The interior outer rim midpoint of the part directly calculates the mode that respective peak excursion angle then carries out difference again, principle with it is above-mentioned only The mode for calculating rotor magnetic pole is identical.

By taking Fig. 7 as an example, if only consider rotor magnetic pole, then be coincidence formula condition, but if magnetic pole of the stator with Rotor magnetic pole offset is identical, and being equivalent to the two, there is no opposite offsets, cannot achieve noise reduction.

Radially referring to Fig. 8 (only schematic forms feature in figure) magnetic pole of the stator, midpoint location of C inside line is oblique as one Polar region, outside correspond to another oblique polar region.

In interior skew back polar region, magnetic pole of the stator (winding wire slot mode) is there is no oblique pole mode is used, in conjunction with Fig. 7, rotor magnetic The oblique pole mode that extremely corresponding part then uses, and meet (36 °/p)<θ1<(90 °/p), therefore be to meet for the area It is required that.

And in the oblique polar region in outside, magnetic pole of the stator is all made of oblique pole mode with rotor magnetic pole, due to offset direction and amplitude It is all identical, therefore θ 1=0 in the oblique polar region in outside.

Generally speaking with regard to magnetic pole, it meets the requirements due to meeting at least one oblique polar region θ 1, it generally can also be real Existing noise reduction, but mainly interior skew back polar region, also based on this, the ratio of size in magnetic pole of the qualified oblique polar region shared by radial direction Example should not be too small, and generally at least 50% or more.

Measure of merit

By taking rotor in Fig. 7 as an example, corresponding stator does not use oblique pole mode, i.e., only rotor uses oblique pole mode, test As a result referring to Fig. 9 and Figure 10, by noise analysis it can be seen from the figure that, using the utility model tiltedly extremely after, motor overall noise has 3- 5dB's is obviously improved, and the noise of certain harmonic waves has the inhibition of 10dB or more, to show its validity.

Disclosed above is only specific embodiment of the utility model, but the utility model is not limited to this, ability The technical staff in domain can carry out the utility model spirit and scope of the various modification and variations without departing from the utility model. These obvious modification and variations should all belong in the protection domain protection of the requires of the utility model.In addition, although in this specification Some specific terms are used, these terms are merely for convenience of description, and it is any special not constituted to the utility model Limitation.

Claims (8)

1. a kind of rotor for disc-type permanent magnet motor, including several magnetic poles for circumferentially arranging and oblique pole mode is used, it is special Sign is, at each radial position of same magnetic pole, using the midpoint in circumferential direction as reference point, and maximum two reference point of circumferential span Between circumferential offset angle be peak excursion angle θ, and meet (36 °/p)<θ<(90 °/p), wherein p are motor number of pole-pairs.

2. being used for the rotor of disc-type permanent magnet motor as described in claim 1, which is characterized in that the magnetic pole is magnet steel, described Reference point is located at magnet steel in the projection of shape of motor axial direction.

3. being used for the rotor of disc-type permanent magnet motor as described in claim 1, which is characterized in that the magnetic pole is winding wire slot, The reference point is located at the enclosed region of adjacent two winding wire slots center line in the projection of shape along motor axial direction.

4. being used for the rotor of disc-type permanent magnet motor as described in claim 1, which is characterized in that each magnetic pole be structure as a whole or Including the multiple sub- magnetic pole units radially arranged successively.

5. being used for the rotor of disc-type permanent magnet motor as described in claim 1, which is characterized in that the magnetic pole is V-arrangement, V-arrangement Inflection point is located at the middle part of magnetic pole radial.

6. a kind of disc-type permanent magnet motor, includes the stator and rotor of axially opposed arrangement, stator and rotor include circumferentially Several magnetic poles of arrangement, which is characterized in that magnetic pole of the stator and rotor magnetic pole are in the corresponding at least part region of radial position Oblique polar region, in oblique polar region, the difference of the deviation angle of magnetic pole of the stator and rotor magnetic pole is θ 1, and meets (36 °/p)<θ1<(90 °/p), Wherein p is motor number of pole-pairs；

The deviation angle is in the oblique polar region of same magnetic pole, and oblique polar region outer edge midpoint is rotated relative to inward flange midpoint in rotor Deviation angle on direction.

7. disc-type permanent magnet motor as claimed in claim 6, which is characterized in that in oblique polar region, only rotor magnetic pole uses oblique pole shape Formula, i.e. magnetic pole of the stator deviation angle are 0 °；Or only magnetic pole of the stator uses oblique polar form, i.e. rotor magnetic pole deviation angle is 0 °.

8. a kind of disc-type permanent magnet motor, includes the stator and rotor of axially opposed arrangement, stator and rotor include circumferentially Several magnetic poles of arrangement, which is characterized in that the rotor of disc-type permanent magnet motor is used for using claim 1~6 any one of them, And only rotor magnetic pole uses oblique polar form.