CN1055087A

CN1055087A - Laminal conductor type rotor for asynchronous motor

Info

Publication number: CN1055087A
Application number: CN 90105430
Authority: CN
Inventors: 陈启星; 罗启宇; 钟颂华; 孙昌军
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-03-21
Filing date: 1990-03-21
Publication date: 1991-10-02

Abstract

Laminal conductor type rotor for asynchronous motor does not adopt the busbar structure of squirrel-cage, but adopts the structure of laminal conductor type, and conductive layer had both played electric action, had played the magnetic conduction effect again, thereby had improved the performance of rotor on the whole.

Description

Laminal conductor type rotor for asynchronous motor

The present invention is a kind of rotor of asynchronous machine, and it does not adopt the material of magnetic conduction differences such as copper, aluminium to make sliver, but adopts existing good soft iron magnetic, has the metal of higher conductive capability to make electric conductor again.

The squirrel cage asynchronous motor rotor is to slot on the iron core that silicon steel sheet builds up at present, waters metals such as cast copper, aluminium and forms bus.The rotor of this structure has some weak point: though 1. the conductivity of bus is high, but because the bus sectional area can not be too big, so all-in resistance just can not be done very for a short time; 2. owing to opened some grooves on iron core, this is non-ferromagnetic part, has destroyed magnetic field structure, has increased magnetic loss, has lowered motor efficiency; 3. sliver can not concentrate on very much the part near rotor outer surface, so rotor inductive currents has influenced the raising of electromagnetic torque also with regard to not being concentrated near outer surface part; 4. inapplicable at non-ferrous metal rotor bars such as some occasion copper, aluminium, such as in the separator closed compressor that with ammonia is working medium.

Purpose of the present invention will solve above several problem exactly, even rotor reduces all-in resistance, reduces magnetic loss, improves electromagnetic torque and can be applied in the environment that atmosphere such as ammonia surrounds.

The present invention has carried out bigger change with rotor on the basis of present squirrel cage motor, made to be called the rotor of laminal conductor type into, and it does not adopt copper, aluminium etc. to conduct electricity very well, but the metal of magnetic property difference is made bus, but adopts conductive coating structure.Conductive layer is to constitute like this: make the strip thin slice by soft iron (ferrous) magnetic, the higher material (as iron or ferroalloy) of conductivity earlier, be coated with insulating barrier, build up the garden tubular then, this garden tube is exactly a conductive layer.Fig. 1 is its schematic diagram, and the rectangular direction of lamination is arranged essentially parallel to the axle of garden tube, considers the factor of revolutional slip, and rectangular parallel direction with axle is a little angle of cut.Fig. 1 a is the A-A profile of conductive layer, and the height of thin slice promptly is the thick of garden ring.The whole cross section part of conductive layer all is conducting surface except that insulated part, and than traditional big manyfold of bus sectional area, even the conductive conductivity is smaller, whole electricity is led still bigger than traditional.Simultaneously, all weld the garden end face of good conductivity at the conductive layer two ends, also can press from both sides in conductive layer and advance the good rectangular thin slice of a small amount of conductivity, this has just further reduced all-in resistance.Conductive layer has been eliminated the space that is produced by sliver in the rotor magnetic conductor, has improved Distribution of Magnetic Field, has reduced magnetic loss.Conductive layer is built up by thin slice, has reduced eddy current loss, has increased induced current and has been parallel to axial path, thereby raise the efficiency, in addition, induced current all is created in the conductive layer, promptly be created in the outer layer segment of rotor,, raise the efficiency so can improve torque characteristics.Because conductive layer so that whole rotor all needn't adopt non-ferrous metal, so it can have corrosion such as ammonia non-ferrous metal, does not corrode the environment work down of ferrous metal, is in the separator closed compressor of cold-producing medium such as being used in ammonia.In rotor inner layer is the part of radius less than conductive layer, is made by silicon steel sheet or powder metallurgy permeability magnetic material, or makes the part hollow body.Conductive layer also can build up without strip sheet, and directly uses soft iron magnetic, and the higher material of conductivity is directly made a whole garden tube, also can plate the metal of one deck good conductivity.Conductive layer can also be to plate (being coated with) one deck superconductor or conductivity and good material to make on the soft iron magnet rotor.

After this invention is implemented, will produce following benefit: 1. reduce the all-in resistance of rotor, reduce rotor resistance power consumption heating, improve useful life and efficient; 2. current concentration can improve electromagnetic torque and electrical efficiency in the rotor outer layer part; 3. improve the Distribution of Magnetic Field situation, reduce magnetic loss; 4. can not corrode the environment work down of ferrous metal at corrosion non-ferrous metals such as ammonia; 5. material such as ferroalloy is inexpensive, and technology is simple, thereby cost descends.

Concrete structure of the present invention is provided by following examples and accompanying drawing.

Fig. 2 is a kind of cutaway view of rotor of conductive coating structure, its internal layer (1) is built up by silicon steel sheet or powdered metallurgical material is made, it is hollow also to can be made into part, outer (2) are conductive layer, the strip thin slice of being made by iron or ferroalloy (require soft iron magnetic and conductivity all good) builds up, wherein also can press from both sides folded a little copper, aluminium sliver, the conducting surface at two ends (3), (4) are made by the material of good conductivity, conducting surface will all weld close with the whole cross section of conductive layer, to reduce resistance, (5), (6) are soldering openings.Fig. 2 a is the B-B profile of this rotor.

Claims

1, the present invention is a kind of rotor of asynchronous machine, it is not the structure that adopts present squirrel-cage bus, but the structure of employing conductive layer, conductive layer is the outer layer segment of rotor, it is to constitute like this: at first by soft iron (ferrous) magnetic, better conductivity material (as iron or ferroalloy) makes the strip thin slice, build up Fig. 1 shape garden tube after being coated with insulating barrier, wherein can press from both sides the folded rectangular thin slice of the good metal of conductivity, rectangular direction is a little angle of cut with the direction that is parallel to axle; Conductive layer can also by soft iron (ferrous) magnetic, the better conductivity material makes very thin superconductor of a whole garden tube or one deck or very strong plating (being coated with) layer of conductive capability.The conduction end face that the material of conductive layer two ends and good conductivity is made is closely welding on whole conductive layer cross section, and the internal layer of rotor is built up by silicon steel sheet or made or to make part hollow by the powder metallurgy permeability magnetic material.

2,, on the conductive layer of iron or ferroalloy, plate the metal of good conductivity such as (being coated with) layer of copper according to the described conductive layer rotor of claim 1.