CN205249009U - Motor rotor and motor - Google Patents

Abstract

The utility model provides an electric motor rotor, including rotor core, rotor core includes a n rotor core section along the axial at least, n >= 2 wherein, and every rotor core section sets up a plurality of magnet grooves that are used for installing magnet, and the contained angle in the magnet groove that both ends rotor core section corresponds is alpha 0, n and satisfies the relational expression with alpha 0: (Imgfile='DDA0000872790840000011. TIF'wi='1196'he='150' /) wherein, Z is motor stator's the number of slots, and 2p is electric motor rotor's number of poles, and LCM is least common multiple. Compared with the prior art, the utility model provides a motor rotor and motor through utmost point angular dimension is limited to one side to the segmentation scalar sum, reduces the tooth's socket torque of motor by a wide margin.

Description

A kind of rotor and motor

Technical field

The utility model relates to permagnetic synchronous motor field, is specifically related to a kind of rotor and motor.

Background technology

Existing compressor permanent magnet synchronous motor is in the cold situation of winding, due to the permanent magnetism in rotorThe effect attracting each other between the magnetic field that body produces and stator tooth, has formed one along the tangential power of circumference, claimsBe cogging torque. Cogging torque can make the output torque of motor produce fluctuation, thereby the operation of motor is producedRaw negative effect: reduce motor operation stability, affect control accuracy, the impact of controller on motor electricThe efficiency of machine, vibration and the noise etc. that generation is very large. Therefore be suggested in order to address this problem a lot of methods,Wherein remarkable to the eradicating efficacy of cogging torque with skew technology.

Skew is divided into stator slot skew and rotor pole skew, is called skewed slot and the oblique utmost point.

At present to use more method be the oblique utmost point of segmentation to skewed-rotor, but to the oblique polar angle degree of skewed-rotor andCombination between segments is well definition not, if at will choose the segmentation of skewed-rotor angle and rotorNumber, may not can produce larger weakening effect to cogging torque, even strengthens cogging torque.

Utility model content

Because the above-mentioned defect of prior art, technical problem to be solved in the utility model is to provide a kind of electricityMachine rotor, by oblique polar angle size is limited, reduces the cogging torque of motor significantly.

The utility model provides a kind of rotor, comprises rotor core, and rotor core at least comprises n verticallyIndividual rotor core section, wherein n >=2, each rotor core section arranges multiple for the magnet groove of magnet is installed,The angle of the magnet groove of two ends rotor core section correspondence is α₀, n and α₀Meet relational expression:

$0.8*\frac{360}{LCM(Z,2p)}*\frac{n-1}{n}\≤{\mathrm{\α}}_0\≤1.1*\frac{360}{LCM(Z,2p)}*\frac{n-1}{n}$

Wherein, the groove number that Z is motor stator, the number of poles that 2p is rotor, LCM is least common multiple.

The angle of the magnet groove that further, adjacent rotor core packet is corresponding is α₁，α₀With α₁Meet relationFormula:

α₁＝α₀/(n-1)。

Further, in each rotor core section, magnet groove is uniformly distributed circumferentially.

The utility model also provides a kind of motor, comprises above-mentioned rotor.

Compared with prior art, the rotor that the utility model provides and motor, have following beneficial effect:By to segments and tiltedly utmost point angular dimension restriction, reduce significantly the cogging torque of motor.

Below with reference to accompanying drawing, the technique effect of design of the present utility model, concrete structure and generation is done furtherlyBright, to understand fully the purpose of this utility model, feature and effect.

Brief description of the drawings

Fig. 1 is the schematic diagram of the rotor of an embodiment of the present utility model;

Fig. 2 is the side sectional view of the rotor shown in Fig. 1;

Fig. 3 is the motor of the rotor shown in employing Fig. 1 and the motor that does not adopt the rotor shown in Fig. 1Cogging torque comparison diagram.

Detailed description of the invention

As shown in Figure 1 and Figure 2, the rotor of an embodiment of the present utility model, comprises rotor core 1,Rotor core 1 comprises 3 rotor core sections vertically, i.e. n=3 is eachly uniformly distributed circumferentially six useIn the magnet groove 11 that magnet is installed, the angle of the magnet groove 11 of two ends rotor core section correspondence is α₀, adjacentThe angle of the magnet groove 11 of rotor core section correspondence is α₁，α₀With α₁Meet relational expression:

α₁＝α₀/(n-1)。

N and α₀Meet relational expression:

$0.8*\frac{360}{LCM(Z,2p)}*\frac{n-1}{n}\≤{\mathrm{\α}}_0\≤1.1*\frac{360}{LCM(Z,2p)}*\frac{n-1}{n}$

Wherein, the groove number that Z is motor stator, the number of poles that 2p is rotor, LCM is least common multiple.

Adopt the motor of the rotor of the present embodiment, can farthest cut down cogging torque, teeth groove is turnedSquare is reduced to and very lowly even approaches 0.

Taking 9 groove 6 utmost point motors as example, be divided into 4 sections of oblique utmost points, the least common multiple of number of stator slots and rotor number of polesBe 18, can be regarded as to obtain oblique polar angle α₀＝360/18*3/4＝15°。

Calculate through finite element simulation, do not adopt the cogging torque of the motor of the rotor of the present embodiment to be0.447Nm, adopting the cogging torque of the motor of the rotor of the present embodiment is 0.00727Nm. Adopt this realityExecute the not tiltedly cogging torque of the utmost point reduction by 98% of cogging torque ratio of the motor of routine rotor, as shown in Figure 3.

The rotor that the utility model provides and motor, by segments and oblique utmost point angular dimension are limited,Reduce significantly the cogging torque of motor.

More than describe preferred embodiment of the present utility model in detail. Should be appreciated that the ordinary skill of this areaPersonnel just can make many modifications and variations according to design of the present utility model without creative work. Therefore, allIn the art technical staff according to design of the present utility model on the basis of existing technology by logic analysis, push awayReason or the limited available technical scheme of experiment, all should be by the determined protection domain of claimsIn.

Claims (4)

1. a rotor, comprises rotor core, and described rotor core at least comprises n rotor verticallyCore packet, wherein n >=2, each rotor core section arranges multiple for the magnet groove of magnet is installed, and two ends turnThe angle of the magnet groove that sub-core packet is corresponding is α₀, it is characterized in that n and α₀Meet following relational expression:

$0.8*\frac{360}{LCM(Z,2p)}*\frac{n-1}{n}\≤{\mathrm{\α}}_0\≤1.1*\frac{360}{LCM(Z,2p)}*\frac{n-1}{n}$

Wherein, the groove number that Z is motor stator, the number of poles that 2p is described rotor, LCM is least common multipleNumber.

2. rotor as claimed in claim 1, is characterized in that, adjacent described rotor core section correspondenceThe angle of magnet groove be α₁，α₀With α₁Meet relational expression:

α₁＝α₀/(n-1)。

3. rotor as claimed in claim 1, is characterized in that, each the above magnetic of rotor core sectionMetal trough is uniformly distributed circumferentially.

4. a motor, is characterized in that, described motor comprises the motor described in claim 1-3 any oneRotor.