CN100449913C - Assistant magnetism type cage model asynchronous motor - Google Patents

Assistant magnetism type cage model asynchronous motor Download PDF

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CN100449913C
CN100449913C CNB2004100534151A CN200410053415A CN100449913C CN 100449913 C CN100449913 C CN 100449913C CN B2004100534151 A CNB2004100534151 A CN B2004100534151A CN 200410053415 A CN200410053415 A CN 200410053415A CN 100449913 C CN100449913 C CN 100449913C
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rotor
wife
rotating shaft
magnet
stator
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CN1728513A (en
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冯浩
曹文明
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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Abstract

The present invention relates to an assistant magnetism type cage-shaped asynchronous motor, which comprises a stator and a cage-shaped rotor, wherein the stator is composed of an iron core, a stator winding and a base; the iron core is arranged on the base and the stator winding is wrapped on the iron core. The cage-shaped rotor is composed of a rotor core, a rotor winding and a rotating shaft, wherein the rotor winding is wrapped on the rotor core which is connected with the rotating shaft. The present invention also comprises a hollow rotor bracket and a magnetic rotor with inner assist magnetism, wherein the rotor bracket is fixedly connected with the rotor core and is fixedly sheathed on the rotating shaft; the magnetic rotor with inner assist magnetism is arranged in the inner side of the rotor bracket and is sheathed on the rotating shaft. The present invention provides an assistant magnetism type cage-shaped asynchronous motor which can enhance the motor efficiency and the power factor.

Description

The assistant magnetism type cage model asynchronous motor
(1) technical field
The present invention relates to a kind of motor, specifically, relate to a kind of cage type asynchronous motor that is used for electric drive system.
(2) background technology
Usually, known three-phase (single-phase) cage type asynchronous motor generally comprises stator and rotor two major parts, and parts such as end cap, bearing, support, fan.Produce rotating magnetic field by stator winding, in the effect lower rotor part winding of rotating magnetic field, produce induced potential, thereby produce induced current.Induced current is subjected to the effect of power in rotating magnetic field, thereby produces electromagnetic torque, drives load, converts electric energy to mechanical energy.Existing cage modle three-phase (single-phase) asynchronous motor is as the energy conversion device that electric energy is converted to mechanical energy, though than higher, still there is certain loss in conversion efficiency in conversion process of energy.In generator loss, comprise the various forms loss, iron loss, copper loss and mechanical loss, stray loss etc.In addition, index as motor characteristic, except efficient, also has power factor cos θ, because three-phase (unidirectional) asynchronous motor produces rotating magnetic field, require power supply to supply with necessary exciting current, so particularly unloaded power factor and the efficient of the power factor of existing cage modle three-phase (single-phase) asynchronous motor underloading and efficient is lower.
(3) summary of the invention
In order to overcome cage type asynchronous motor efficient and the lower deficiency of power factor in the prior art, the invention provides a kind of assistant magnetism type cage model asynchronous motor that can improve motor efficiency and power factor.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of assistant magnetism type cage model asynchronous motor, comprise stator, cage-type rotor, described stator is by iron core, stator winding and pedestal are formed, iron core is installed on the described pedestal, described stator winding solderless wrapped connection is on described iron core, described cage-type rotor is by rotor core, rotor winding and rotating shaft are formed, the solderless wrapped connection of rotor winding is in rotor core, described rotor core is connected with rotating shaft, also include the rotor field spider of a hollow, one has wife's magnet rotor of magnetic, described rotor field spider is fixedlyed connected with rotor core, described rotor field spider socket is fixed in the described rotating shaft, described wife's magnet rotor is installed on rotor field spider inside, and described wife's magnet rotor is socketed in the described rotating shaft.Described motor can be monophase machine or three phase electric machine.
Further, described wife's magnet rotor comprises magnet steel, mild steel, two oiliness bearings, oil-containing fiber, described magnet steel is positioned at the outermost layer of wife's magnet rotor, mild steel connects described magnet steel and oiliness bearing, the oiliness bearing that is positioned at two ends cooperates with rotating shaft, is the oil-containing fiber between two oiliness bearings.
Further again, be provided with sliding shim between described wife's magnet rotor and the described rotor field spider.
Further, have oil groove in the rotating shaft in the span between two of described wife's magnet rotor oiliness bearings.
The beneficial effect of assistant magnetism type cage model asynchronous motor of the present invention:
1, produces rotating magnetic field in the stator and rotor cores air gap behind the stator winding electrifying, drive rotating shaft rotation output mechanical power during the cage-type rotor rotation, wife's magnet rotor can rotate with respect to rotating shaft, do during operation with the leg speed operation, rotating magnetic field and interior magnet rotor with respect to stator with n 0Rotating speed rotation, the magnetic field of wife's magnet rotor and stator winding intersecting chain induce induced potential in stator winding, the then total electromotive force increase of stator winding, exciting current reduces, and can improve power factor.
2, because wife's magnet rotor exists, and it is big that the degree of coupling of air-gap field and rotor winding becomes, the induced potential that the rotor winding produces when same rotating speed increases, rotor current increases, and electromagnetic torque increases, when driving same load, the revolutional slip S of motor is just little, the mechanical property hardening, because less for same load S, this slip power loss reduces, reduce because of stator current simultaneously, the motor copper loss reduces, and the total losses of motor reduce, and efficient improves.
(4) description of drawings
Fig. 1 is the scantling plan of assistant magnetism type cage model asynchronous motor of the present invention;
Fig. 2 is wife's magnetic rotor structure figure of assistant magnetism type cage model asynchronous motor of the present invention.
(5) embodiment
Below in conjunction with accompanying drawing the present invention is further described.
Embodiment 1
With reference to Fig. 1, Fig. 2, a kind of assistant magnetism type cage model asynchronous motor, described motor is a three phase electric machine, it comprises stator 1, cage-type rotor 2, and stator 1 is made up of iron core, stator winding and pedestal, and iron core is installed on the pedestal, the stator winding solderless wrapped connection is on iron core, cage-type rotor 2 is made up of rotor core, rotor winding and rotating shaft 5, and the solderless wrapped connection of rotor winding is in rotor core, and rotor core is fixedlyed connected with a rotor field spider 3, rotor field spider 3 is fixedlyed connected with rotating shaft 5.Rotor field spider 3 is fixedlyed connected with rotor core, and rotor field spider 3 sockets are fixed in the rotating shaft 5, and wife's magnet rotor 4 is installed on rotor field spider 3 inside, and wife's magnet rotor 4 is socketed in the rotating shaft 5, and described wife's magnet rotor 4 can be with respect to cage-type rotor and rotating shaft rotation.Wife's magnet rotor 4 comprises magnet steel 6, mild steel 7, two oiliness bearings 8, oil-containing fiber 9, magnet steel 6 is positioned at the outermost layer of wife's magnet rotor, mild steel 7 connects magnet steel 6 and oiliness bearing 8, and the oiliness bearing 8 that is positioned at two ends is slidingly matched with rotating shaft 5, is oil-containing fiber 9 between two oiliness bearings.Be provided with sliding shim 10 between wife's magnet rotor 4 and the rotor field spider 3.Have oil groove 11 in the rotating shaft in the span between two oiliness bearings.
Stator 1 is made up of iron core, stator winding and support, is the parts that produce rotating magnetic field.Stator core is the part of motor magnetic circuit, and it is that silicon steel sheet closed assembly with 0.5 millimeters thick is compacted into as a whole.Stator winding is one group of coil that predetermined function is arranged in the motor, is the part of circuit, is formed by connecting by the many coils of copper conductor coiled of tape insulation.The main application of support is the unshakable in one's determination and fixing end cap of support stator.Rotor 2, it is made up of rotor core, rotor winding and rotating shaft 5.Rotating shaft 5 is transmitted powers, is made by medium carbon steel, and the axle journal and the bearing at two ends match, and are supported on the end cap.Rotor core also is the part of motor magnetic circuit, and also the silicon steel sheet with 0.5 millimeters thick builds up.Rotor core is fixed on the rotor field spider.Rotor core is cylindrical.In rotor field spider 3 inside, wife's magnet rotor 4 is installed in the rotating shaft 5.The structure of wife's magnet rotor 4 as shown in Figure 2, magnet steel 6 and stator field produce rotating magnetic field jointly, permanent magnetic material adopts ferrite or rare earth.Mild steel 7 is used for supporting magnet steel 6, connects magnet steel 6 and oiliness bearing 8, is the part of magnetic circuit.Consider that wife's magnet rotor operation is for the leg speed rotation, no iron loss can be selected common mild steel for use.Oiliness bearing 8 and oil-containing fiber 9, oiliness bearing 8 can freely rotate by the phase countershaft wife's magnet rotor 4.The oil groove 11 that oil-containing fiber 9 cooperates in the rotating shaft makes that the machine oil in the oil-containing fiber can make inner rotor bearing keep lubricating status for a long time, keeps long-term good running status.Pad 10 can prevent that wife's magnet rotor 4 phase countershafts 5 from touching cage-type rotor support 3 when rotating.
Motor stator 1 three-phase symmetric winding adds three-phase symmetric voltage, and stator winding produces the three-phase symmetrical current, thereby produces the stator rotating magnetic field, during operation, wife's magnet rotor 4 with respect to stator with n 0Rotating speed do synchronous operation with rotating magnetic field.Cage-type rotor 2 is with respect to the rotating speed rotation of stator 1 with n, the common air-gap field that constitutes synchronous rotation in rotating magnetic field and interior magnetic assist magnetic field, the relative velocity cutting rotor winding with Δ n produces induced potential, electric current in the rotor winding, thereby the generation electromagnetic torque drives load.
Since rotating magnetic field and interior magnet rotor with respect to stator with n 0Rotating speed rotation, the magnetic field of wife's magnet rotor and stator winding intersecting chain induce induced potential in stator winding, be equivalent to the armature voltage E of synchronous machine 0So, the induced potential that the stator winding of motor produces:
E · = j 4.44 f 1 N 1 k ( Φ · 1 + Φ · 0 )
In the formula
Figure C20041005341500072
---the magnetic flux that the stator excitation electric current produces
Figure C20041005341500073
---the magnetic flux that interior magnet rotor and stator winding intersecting chain produce
f 1---supply frequency
N 1K---the effective turn of every phase stator winding
By following formula as can be known
Figure C20041005341500074
E more then 0Bigger, exciting current is just little, can improve power factor.
In addition, when wife's magnet rotor 4 existed, it is big that the degree of coupling of air-gap field and rotor winding becomes.So the induced potential that the rotor winding produces when same rotating speed increases, rotor current increases, and electromagnetic torque increases, and when driving same load, the revolutional slip S of motor is just little, the mechanical property hardening.Since less for same load S, the slip power loss is reduced, reducing because of stator current simultaneously, the motor copper loss reduces, and therefore, the total losses of motor reduce, and efficient improves.
Saturable threephase asynchronous more of the present invention and common threephase asynchronous, motor is when underloading, and efficient is significantly improved, and along with the increase of load, the improved efficiency effect reduces, but still obviously improves when nominal load.Power factor magnetic assist motor also obviously improves than common electric machine.From mechanical property, the hardness of the mechanical property of the motor of invention obviously improves, and the overload capacity of motor obviously improves under the same voltage.
Embodiment 2
With reference to Fig. 1, Fig. 2, a kind of assistant magnetism type cage model asynchronous motor, described motor is a monophase machine, the basic structure of motor is identical with three-phase cage asynchronous motor among the embodiment 1.
Its course of work is: motor stator 1 single-phase winding (auxiliary winding connects shift capacitor starting or operation) adds single-phase voltage, and stator winding produces monophase current, thereby produces the stator elliptic rotating field, during operation, wife's magnet rotor 4 with respect to stator with n 0Rotating speed do synchronous operation with rotating magnetic field.Cage-type rotor 2 is with respect to the rotating speed rotation of stator 1 with n, the common air-gap field that constitutes synchronous rotation in rotating magnetic field and interior magnetic assist magnetic field, the relative velocity cutting rotor winding with Δ n produces induced potential, electric current in the rotor winding, thereby the generation electromagnetic torque drives load.
Since rotating magnetic field and interior magnet rotor with respect to stator with n 0Rotating speed rotation, the magnetic field of wife's magnet rotor and stator winding intersecting chain induce induced potential in stator winding, be equivalent to the armature voltage E of synchronous machine 0So, the induced potential that the stator winding of motor produces:
E · = j 4.44 f 1 N 1 k ( Φ · 1 + Φ · 0 )
In the formula
Figure C20041005341500082
---the magnetic flux that the stator excitation electric current produces
Figure C20041005341500083
---the magnetic flux that interior magnet rotor and stator winding intersecting chain produce
f 1---supply frequency
N 1K---the effective turn of every phase stator winding
By following formula as can be known E more then 0Bigger, exciting current is just little, can improve power factor.
In addition, when wife's magnet rotor 4 existed, it is big that the degree of coupling of air-gap field and rotor winding becomes.So the induced potential that the rotor winding produces when same rotating speed increases, rotor current increases, and electromagnetic torque increases, and when driving same load, the revolutional slip S of motor is just little, the mechanical property hardening.Since less for same load S, the slip power loss is reduced, reducing because of stator current simultaneously, the motor copper loss reduces, and therefore, the total losses of motor reduce, and efficient improves.
Saturable single-phase asynchronous motor more of the present invention and common monopole asynchronous motor, motor is when underloading, and efficient is significantly improved, and along with the increase of load, the improved efficiency effect reduces, but still obviously improves when nominal load.Power factor magnetic assist motor also obviously improves than common electric machine.From mechanical property, the hardness of the mechanical property of the motor of invention obviously improves, and the overload capacity of motor obviously improves under the same voltage.

Claims (3)

1, a kind of assistant magnetism type cage model asynchronous motor, comprise stator, cage-type rotor, described stator is by iron core, stator winding and pedestal are formed, iron core is installed on the described pedestal, described stator winding solderless wrapped connection is on described iron core, described cage-type rotor is by rotor core, rotor winding and rotating shaft are formed, the solderless wrapped connection of rotor winding is in rotor core, described rotor core is connected with rotating shaft, also include the rotor field spider of a hollow, one has wife's magnet rotor of magnetic, described rotor field spider is fixedlyed connected with rotor core, described rotor field spider socket is fixed in the described rotating shaft, described wife's magnet rotor is installed on rotor field spider inside, and described wife's magnet rotor is socketed in the described rotating shaft, it is characterized in that:
Described wife's magnet rotor comprises magnet steel, mild steel, two oiliness bearings, oil-containing fiber, described magnet steel is positioned at the outermost layer of wife's magnet rotor, mild steel connects described magnet steel and oiliness bearing, and the oiliness bearing that is positioned at two ends cooperates with rotating shaft, is the oil-containing fiber between two oiliness bearings.
2, assistant magnetism type cage model asynchronous motor as claimed in claim 1 is characterized in that: be provided with sliding shim between described wife's magnet rotor and the described rotor field spider.
3, as claim 1 or 2 described assistant magnetism type cage model asynchronous motors, it is characterized in that: have oil groove in the rotating shaft in the span between two oiliness bearings of described wife's magnet rotor.
CNB2004100534151A 2004-07-28 2004-07-28 Assistant magnetism type cage model asynchronous motor Expired - Fee Related CN100449913C (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09215286A (en) * 1996-02-02 1997-08-15 Mitsubishi Electric Corp Squirrel-cage induction motor and its manufacture
CN1267946A (en) * 1998-06-24 2000-09-27 韩天鹏 Asynchronous motor
CN2398770Y (en) * 1999-11-01 2000-09-27 袁尊南 High moment speed-regulating three-phase asynchronous motor
US20040012293A1 (en) * 2000-08-23 2004-01-22 Horst Kuemmlee Squirrel-cage rotor for an asynchronous induction motor
CN2713720Y (en) * 2004-07-29 2005-07-27 浙江工业大学 Magnetic assisting type cage mode asynchronous motor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09215286A (en) * 1996-02-02 1997-08-15 Mitsubishi Electric Corp Squirrel-cage induction motor and its manufacture
CN1267946A (en) * 1998-06-24 2000-09-27 韩天鹏 Asynchronous motor
CN2398770Y (en) * 1999-11-01 2000-09-27 袁尊南 High moment speed-regulating three-phase asynchronous motor
US20040012293A1 (en) * 2000-08-23 2004-01-22 Horst Kuemmlee Squirrel-cage rotor for an asynchronous induction motor
CN2713720Y (en) * 2004-07-29 2005-07-27 浙江工业大学 Magnetic assisting type cage mode asynchronous motor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
双转子异步电动机的研究. 冯浩，刘玉军，钟德刚，金阳.中小型电机，第29卷第1期. 2002 *

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