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Rotor punching and rotor core having same, and motor

A technology of rotor punching and rotor core, which is applied to the rotating parts of the magnetic circuit, the shape/style/structure of the magnetic circuit, etc., can solve the problems of affecting the utilization rate of permanent magnets, the reduction of motor efficiency, and the excess of motor functions. Effects of motor efficiency, reduction of flux leakage, and improvement of utilization

Pending Publication Date: 2019-02-05
WOLONG ELECTRIC GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, both the outer closed-slot rotor core and the inner closed-slot rotor core have flux leakage magnetic circuits, which affect the utilization rate of the permanent magnets, thereby reducing the efficiency of the motor.
[0003] For motors with low speed requirements, the above two rotor core structures have excess motor functions, resulting in waste of cost

Method used

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  • Rotor punching and rotor core having same, and motor
  • Rotor punching and rotor core having same, and motor
  • Rotor punching and rotor core having same, and motor

Examples

Experimental program
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Effect test

example 1

[0030] Such as figure 1 As shown, a rotor punching piece includes a pole portion 1, an inner ring 2, and a magnetic steel groove 3. Two adjacent pole portions 1 form an outer open groove 4 at the outer end of the magnetic steel groove 3; One side of the inner end of each magnetic steel groove 3 is provided with an outwardly protruding magnetic steel stopper 5, and the inner circle side of the stopper 5 is a groove, so that the shape of the stopper 5 is Convex outside and concave inside, its width dimension L satisfies 0.3≤L≤1.5mm.

[0031] Such as figure 2 As shown, a rotor core includes a plurality of the above-mentioned rotor punches, and the positioning portions 5 and pole portions 1 of the plurality of rotor punches are aligned up and down, and are laminated along the axial direction.

[0032] A motor whose rotor core adopts the above-mentioned rotor core.

[0033] In this example, the rotor iron core adopts 6 rotor punches, the rotor punches are provided with 10 pole ...

example 2

[0035] Such as image 3 As shown, the difference from the above example 1 is that the inner ring 2 is provided with an inner opening groove 6, and the inner opening groove 6 is formed by canceling and disconnecting the limit part 5 at the inner end of the magnetic steel groove 3 at the corresponding position, and the pole part The number of 1 is S, the number of inner open grooves 6 is N, and the number of N satisfies: 0≤N≤S.

[0036] In order to better reduce magnetic flux leakage, the relationship between the number N of inner opening slots 6 and the number S of pole parts 1 satisfies: N is an integer fraction of S, and N is a positive integer. A reasonable number of inner opening slots 6 can better reduce magnetic flux leakage.

[0037] In order to better reduce magnetic flux leakage, the inner opening slots 6 and the limiting parts 5 are arranged alternately along the circumferential direction of the inner ring 2 . The punching structure in which the inner opening slots ...

example 3

[0041] Such as Figure 5 As shown, the difference from the above example 1 or example 2 is that a rotor core includes one or more sets of rotor laminations, each set of rotor laminations includes at least one first rotor lamination 8 and two second rotor laminations. Rotor punching 7, the first rotor punching 8 is the rotor punching of Example 1, the second rotor punching 7 is the rotor punching of Example 2, and the two adjacent second rotor punchings 7 have a rotation angle α, so that the inner opening The grooves 6 and the limiting parts 5 are arranged alternately in the axial direction. This structural shape can effectively balance the mechanical strength of the rotor core and the degree of magnetic flux leakage.

[0042] In this example, the rotor core is composed of two sets of rotor punches. In each set of rotor punches, there is one first rotor punch 8, two second rotor punches 7, and the rotation angle α is 36°.

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Abstract

The present invention discloses a rotor punching and a rotor core having same, and a motor, and relates to the field of motors. A rotor core has a leakage flux magnetic circuit to cause reduction of the motor efficiency in the prior art. The rotor punching comprises pole portions, an inner circular ring and a magnetic steel groove, two adjacent pole portions form an opening groove at the outer endof the magnetic steel groove, an outwards extruded stop portion is arranged at the inner side of the magnetic steel groove at the inner circular ring, grooves are arranged at the inner circle side ofthe inner circular ring at the stop portions to allow the shapes of the stop portions to be outwards convex and inwards concave, and the width size L meet the formula: 0.3<=L<=1.5mm; the inner circular ring is provided with an inner opening groove which is formed by canceling and disconnecting the stop portions at the inner end of the magnetic steel groove. The inner opening groove is configuredto cut off the leakage flux magnetic circuit between the pole portions and the inner circular ring to improve the utilization rate of the permanent magnet; the outwards convex and inwards concave stopportion structure is employed to reduce the leakage flux between the pole portions and the inner circular ring through control of the width of the stop portions, and therefore, the rotor core havingthe rotor punching and the motor can effectively improve the motor efficiency and can reduce the cost.

Description

technical field [0001] The invention relates to the field of motors, in particular to a rotor punch, a rotor iron core with the punch, and a motor. Background technique [0002] At present, both the outer closed-slot rotor core and the inner closed-slot rotor core have flux leakage magnetic circuits, which affect the utilization rate of the permanent magnets and further reduce the efficiency of the motor. [0003] For motors with low rotational speed requirements, both of the above two rotor core structures have excess motor functions, resulting in waste of cost. [0004] For the unavoidable flux leakage magnetic circuit, how to optimize the design structure and minimize the flux leakage is a problem to be solved urgently by those skilled in the art. [0005] In view of this, it is necessary to develop a rotor punch, a rotor core having the punch, and a motor to solve the above problems. Contents of the invention [0006] The technical problem to be solved and the techni...

Claims

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Application Information

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IPC IPC(8): H02K1/27
CPCH02K1/27
Inventor 赵新超李贻伟孙祥善杜洪彪丁德亮陈航
Owner WOLONG ELECTRIC GRP CO LTD
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