CN202455231U

CN202455231U - Synchronous motor rotor structure

Info

Publication number: CN202455231U
Application number: CN2012200824493U
Authority: CN
Inventors: 吕永迷; 徐正华
Original assignee: NANJING ESTUN AUTOMATIC CONTROL TECHNOLOGY Co Ltd; Nanjing Estun Automation Co Ltd
Current assignee: Nanjing Estun Automation Co Ltd
Priority date: 2012-03-07
Filing date: 2012-03-07
Publication date: 2012-09-26
Anticipated expiration: 2022-03-07

Abstract

Provided is a synchronous motor rotor structure. A pair of rotor spokes is fixed in a rotor core, two ends of the rotor core are closed, a mouse cage type rotor structure is formed, and the distance L between the positions of the rotor spokes and closed end of the rotor core is 1/5-1/6 of the length of the rotor core. The synchronous motor rotor structure is used for big length-diameter ratio synchronous motors, shortens the distance between two rotor spokes of the mouse cage type rotor structure, reduces length-diameter ratio of a rotor, increases mouse cage stiffness, reduces deformation, reduces vibration of the rotor, improves stability and accuracy of movement of the motor, and further reduces requirements for welding stress.

Description

A kind of synchronous electric motor rotor structure

Technical field

The utility model relates to the servomotor technical field, is used for the low-speed big permanent-magnet servo motor, is a kind of novel synchronous motor rotor construction.

Background technology

At present, the low-speed big servo motor rotor, its rotor core composition mode is the cage rotor that iron core and spoke closed at both ends are welded.This rotor has solved the bigger problem of rotor moment of inertia, but can't avoid because rotor axial is longer, the rigidity of the rotor that causes reduces, thereby has influenced the problem that motor stabilizing property etc. is brought.

Summary of the invention

The problem that the utility model will solve is: there is stability problem in existing low-speed big servo motor rotor because armature spindle is longer.

The technical scheme of the utility model is: a pair of rotor spoke is fixed in the rotor core, and the two ends of enclosed rotor iron core constitute the cage rotor structure, and the distance L of the position of rotor spoke and its enclosed rotor iron core end is 1/5～1/6 of a rotor core length.

The utility model has shortened the spacing of cage rotor structure two rotor spokes, has reduced the draw ratio of rotor, has increased mouse cage rigidity, reduces deformation, reduces the rotor vibration, improves motor movement stationarity and precision; In the processing of welding procedure and butt welded seam, when the rotor spoke directly welded in the rotor core end, promptly distance L is 0 o'clock, and was under the prerequisite that satisfies the welding stress requirement, higher to welding process requirement in addition; But, under the prerequisite that satisfies the welding stress requirement, welding stress is required and can reduce relatively in position welding according to the core ends certain size.

Description of drawings

Fig. 1 is that the rotor spoke is connected schematic cross-section with rotor core.

Fig. 2 is among the utility model embodiment, and rotor spoke and rotor core end distance are connected sketch map when L is 0mm.

Fig. 3 is among the utility model embodiment, and rotor spoke and rotor core end distance are connected sketch map when L is 72mm.

Fig. 4 is among the utility model embodiment, and rotor spoke and rotor core end distance are connected sketch map when L is 100mm.

Embodiment

Like Fig. 1; The synchronous electric motor rotor structure of the utility model; A pair of rotor spoke 1 is weldingly fixed in the rotor core 2, and the two ends of enclosed rotor iron core 2 connect through adapter sleeve 3 between two rotor spokes 2; Constitute the cage rotor structure, the distance L of the position of rotor spoke 1 and its enclosed rotor iron core end is 1/5～1/6 of rotor core 2 length.

The welding position of the rotor core of cage rotor structure and rotor spoke different, promptly distance L is got different length, and the stress and strain of respective rotor iron core is also different.

, calculate, compare, under identical operational environment for the rotor of the long 440mm of φ 500mm is an example with the external diameter through three-dimensional simulation; Rotor core is under identical torque and the pressure: 1. when the rotor spoke is welded on the rotor core two ends; Be L=0, like Fig. 2, cage rotor maximum stress 4.5X10 ⁷Pa, coefficient of safety is less than 8 times, and the maximum displacement of deformation reaches 0.057mm, the deformation in the middle of rotor core is the most outstanding; 2. when the rotor spoke was welded on apart from rotor core end 72mm, promptly L was 1/5～1/6 of a rotor core length overall, like Fig. 3, and cage rotor maximum stress 4.0X10 ⁷Pa, coefficient of safety is nearly 9 times, and the maximum displacement of deformation 0.03mm only, rotor core bulk deformation amount is even; 3. when the rotor spoke is welded on apart from rotor core end 100mm, i.e. L>=1/5, like Fig. 4, cage rotor maximum stress 4.4X10 ⁷Pa, coefficient of safety is for being slightly larger than 8 times, and the maximum displacement of deformation is 0.045mm, and the deflection of rotor core end is more obvious.Specifically see the following form.

Through simplation verification, when rotor spoke and rotor core end distance leave L be the rotor core length overall 1/5～1/6 the time, the maximum stress and the deformation of rotor core are less; But when the rotor spoke near the rotor core length overall of core ends L >=1/5 time, the maximum stress of rotor is that 1/5 of rotor core length overall～1/6 is o'clock little than L, but the deformation position influences the stability of drive of motor in the rotor core end; The maximum stress of rotor core and deformation is bigger when L=0, concentrates on the iron core middle part.

The concrete welding position of rotor core and rotor spoke in the scope of the utility model, by the major diameter of rotor mouse cage when the concrete dimensional requirement of motor combine rotor structure stability and rigidity requirement to confirm.

In the processing of welding procedure and butt welded seam, when the rotor spoke welds in the rotor core end, under the prerequisite that satisfies the welding stress requirement, higher to welding process requirement; But, under the prerequisite that satisfies the welding stress requirement, welding stress is required and can reduce relatively in position welding according to the core ends certain size.

The spacing of two spokes in the cage rotor structure has been shortened in the welding position of rotor core of the utility model and rotor spoke, has reduced the draw ratio of rotor; Increased mouse cage rigidity; Reduce deformation, reduce the rotor vibration, improve motor movement stationarity and precision.

Claims

1. synchronous electric motor rotor structure; A pair of rotor spoke (1) is fixed in the rotor core (2); The two ends of enclosed rotor iron core (2); Constitute the cage rotor structure, it is characterized in that the position of rotor spoke (1) and the distance L of its enclosed rotor iron core end are 1/5～1/6 of rotor core (2) length.

2. a kind of synchronous electric motor rotor structure according to claim 1 is characterized in that rotor spoke (1) is weldingly fixed in the rotor core (2).