Double-skewed-slot rotor, and stator-rotor equal-slot matching structure based on rotor

A double-chute, stator-rotor technology, applied in the direction of magnetic circuit shape/style/structure, magnetic circuit rotating parts, electrical components, etc., can solve the problem that the straight-slot cage rotor induction motor cannot start and weaken the harmonic magnetic field of the stator teeth Electromotive force, weakening of synchronous additional torque and other problems, to achieve good starting characteristics, small asynchronous additional torque, and small additional loss

Pending Publication Date: 2017-06-13
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When the stator and rotor select the same number of slots, synchronous additional torque is generated between the stator and rotor harmonic magnetic fields, and the straight slot cage rotor induction motor cannot start
When the rotor adopts a skewed slot, the coupling between the stator magnetic field and the rotor magnetic field is reduced. When the rotor is skewed by a stator tooth pitch, the electromotive force induced by the stator tooth harmonic field in the rotor winding can be weakened, but the single skewed rotor induction motor can only Weaken the influence of stator tooth harmonic field, cannot eliminate its influence
When the number of stator and rotor slots is equal, the single-slotted rotor induction motor can weaken the synchronous additional torque, but it still cannot start

Method used

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  • Double-skewed-slot rotor, and stator-rotor equal-slot matching structure based on rotor
  • Double-skewed-slot rotor, and stator-rotor equal-slot matching structure based on rotor
  • Double-skewed-slot rotor, and stator-rotor equal-slot matching structure based on rotor

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Experimental program
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Effect test

Embodiment 1

[0047] Such as Figure 2-3 As mentioned above, this embodiment discloses a double-sloped rotor, the number of slots of the double-sloped rotor is equal to the number of slots of the stator matched with it; the double-sloped rotor includes the first rotor, the second Two rotors; the groove body 111 of the first rotor is oppositely twisted to the corresponding groove body 121 of the second rotor;

[0048] The distance between the chute of the first rotor and the second rotor is:

[0049]

[0050] The chute angles of the first rotor and the second rotor are both:

[0051]

[0052] Among them, Z 1 is the number of stator slots, p is the number of pole pairs of the motor, D i1 is the inner diameter of the stator;

[0053] The stagger distance between the slot body of the first rotor and the corresponding slot body in the second rotor is:

[0054]

[0055] The stagger angle between the slot body of the first rotor and the corresponding slot body in the second rotor is:...

Embodiment 2

[0066] This embodiment discloses a cage-type rotor induction motor with 24-24 stator and rotor slots. The rotor is a built-in rotor, which is built into the cavity of the stator. Straight-slotted rotors, skewed-slotted rotors, and double-sloped-slotted rotors are used respectively. The main parameters of the motors are shown in Table 1.

[0067] Table 1 Main parameters of the motor

[0068] Rated power (kW) 1.5 Number of parallel branches 1 Stator outer diameter (mm) 130 Stator inner diameter (mm) 80 Core length (mm) 105 Air gap length(mm) 0.25 Number of stator slots 24 Number of rotor slots 24 Winding connection form star shape number of poles 4

[0069] Among them, the chute angle of the chute rotor is 15°, the chute distance is 10.4mm; the chute angle of each segment of the double chute rotor is 15°, the chute distance of each rotor segment is 10.4mm, the stagger angle is 7.5°, and the stagger distance i...

Embodiment 3

[0080] This embodiment discloses a cage-type rotor induction motor with 36-36 slots in the stator and rotor. The parameters are shown in Table 4.

[0081] Table 4 Main parameters of the motor

[0082] Rated power (kW) 11 Number of parallel branches 1 Stator outer diameter (mm) 260 Stator inner diameter (mm) 170 Core length (mm) 155 Air gap length(mm) 0.5 Number of stator slots 36 Number of rotor slots 36 Winding Connection triangle number of poles 4

[0083] Among them, the chute angle of the chute rotor is 10°, and the chute distance is 11.8mm; the chute angle of each segment of the double chute rotor is 10°, the distance of each rotor electric chute is 11.8mm, and the stagger angle of the two rotor segments is 5 °, the stagger distance is 5.9mm.

[0084] When the stator and rotor slot fit is 36-36, the stator and rotor harmonic spectrum is shown in Table 5.

[0085] Table 5 When the groove fit is 36-36,...

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Abstract

The invention discloses a double-skewed-slot rotor, which relates to the technical field of motors. A slot number of the rotor is equal to that of a stator matched with the rotor. The double-skewed-slot rotor comprises a first rotor and a second rotor; a slot body of the first rotor and a corresponding slot body in the second rotor are twisted in opposite directions; skewed slot distances of the first rotor and the second rotor are both as follows: (shown in the description); skewed slot angles of the first rotor and the second rotor are both as follows: (shown in the description); Z1 is a slot number of the stator, p is a number of pole pairs of a motor, and Di1 is an inner diameter of the stator; and a staggered angle of the slot body of the first rotor and the corresponding slot body in the second rotor is as follows: (shown in the description), wherein Z2 is a slot number of the rotor. The invention also discloses a stator-rotor equal-slot matching structure based on the rotor. The double-skewed-slot rotor has the advantage that the limitation on the selection of the slot number of the stator and rotor of a traditional induction electric motor and the application of the equal-slot matching can be broken through.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a double-slanted-slot rotor, a stator-rotor based on the rotor, and other slot matching structures. Background technique [0002] The air-gap magnetic field of the motor is composed of the fundamental air-gap magnetic field and the harmonic air-gap magnetic field. The additional loss of the induction motor is mainly caused by the air gap harmonic flux. These harmonic magnetic fields produce surface loss and tooth pulsation loss in the core of the stator and rotor, and high frequency current loss in the cage rotor. Among them, the role of stator and rotor tooth harmonic flux is the most significant. [0003] When the number of slots in the stator and rotor is equal, the electric potential induced by the stator tooth harmonic flux in the rotor bar is as follows: figure 1 shown. When the number of stator and rotor slots is equal, the number of poles of the harmonic flux of the fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/26
CPCH02K1/265H02K2213/03
Inventor 鲍晓华汪朗陈垒王春雨徐威方金龙
Owner HEFEI UNIV OF TECH
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