CN103730994A - Remanufacturing method for inefficient three-phase asynchronous motor - Google Patents

Remanufacturing method for inefficient three-phase asynchronous motor Download PDF

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Publication number
CN103730994A
CN103730994A CN201410025367.9A CN201410025367A CN103730994A CN 103730994 A CN103730994 A CN 103730994A CN 201410025367 A CN201410025367 A CN 201410025367A CN 103730994 A CN103730994 A CN 103730994A
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China
Prior art keywords
permanent magnet
rotor
threephase asynchronous
poor efficiency
layer
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Pending
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CN201410025367.9A
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Chinese (zh)
Inventor
徐殿国
倪荣刚
贵献国
王高林
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Harbin Institute of Technology
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Harbin Institute of Technology
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Priority to CN201410025367.9A priority Critical patent/CN103730994A/en
Publication of CN103730994A publication Critical patent/CN103730994A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a remanufacturing method for an inefficient three-phase asynchronous motor and belongs to the field of motor efficiency enhancing. The remanufacturing method aims at solving the problem of low efficiency of prior three-phase asynchronous motor. According to the remanufacturing method, an asynchronous cage rotor of a prior inefficient three-phase asynchronous motor is replaced by a built-in permanent magnet rotor, that is, the inefficient three-phase asynchronous motor is changed into a built-in permanent-magnet synchronous motor, so that the remanufactured motor energy efficiency level reaches IE4, the remanufactured motor rated load rated load rate is larger than 1.5, and the remanufactured motor no-load opposite electro-dynamic potential total harmonic distortion is smaller than 7%, which is lower than low-speed and medium-high-speed sensorless control. The remanufacturing method is applicable to transformation of inefficient three-phase asynchronous motors.

Description

A kind of reproducing method of poor efficiency threephase asynchronous
Technical field
The invention belongs to motor efficiency and promote field.
Background technology
According to statistics, whole world total electricity consumption 19.46 trillion kilowatt hours in 2012, wherein exceed the electric quantity consumption of half on motor.At present, the market maintenance of poor efficiency asynchronous motor is very huge.The motor efficiency grade scale IEC60034-30 (2008) that contrast International Electrotechnical Commission (IEC) formulates, the efficiency of existing asynchronous motor is generally lower than even IE2 of IE3.In order to improve asynchronous motor efficiency, realize energy-saving and emission-reduction, comparatively general way is that cast-aluminum rotor copper casting rotor is substituted at present, so can reach IE3 level efficiency.But the technique of copper casting rotor is far beyond cast-aluminum rotor complexity, and expensive, cause copper casting rotor motor still not general.And another kind to do rule be that existing poor efficiency asynchronous motor entirety is eliminated, the efficient permanent magnet synchronous motor that replaces, so can reach IE4 level efficiency.But this way cannot make full use of parts and the material of existing motor, causes the huge wasting of resources, and there is the problems such as input cost is high, reciprocation cycle is long, be difficult to be accepted by user.
Summary of the invention
The present invention is in order to solve the problem that existing Three-phase Asynchronous Motor Efficiency is low, and a kind of reproducing method of poor efficiency threephase asynchronous is now provided.
A reproducing method for poor efficiency threephase asynchronous, the process of the method is: the asynchronous squirrel-cage rotor of original poor efficiency threephase asynchronous is replaced with to built-in type permanent-magnet rotor.
The winding of above-mentioned original poor efficiency threephase asynchronous is that star connects, the every utmost point of built-in type permanent-magnet rotor comprises one deck permanent magnet layer, on this permanent magnet layer, have U-shaped permanent magnet trough, permanent magnet is positioned at permanent magnet trough bottom, the outer wall of rotor core consists of P section eccentric arc, all corresponding one section of eccentric arc of the opening part of each U-shaped permanent magnet trough; The ratio of described eccentric arc radius and rotor radius is between 0.7~0.8, and P is rotor number of poles.
The winding of above-mentioned original poor efficiency threephase asynchronous is that star connects, the every utmost point of built-in type permanent-magnet rotor comprises two-layer permanent magnet layer, on two-layer permanent magnet layer, all have U-shaped permanent magnet trough, permanent magnet is positioned at permanent magnet trough bottom, and two-layer permanent magnet is parallel to each other, the outer wall of rotor core consists of P section eccentric arc, all corresponding one section of eccentric arc of the opening part of each U-shaped permanent magnet trough in skin; The ratio of described eccentric arc radius and rotor radius is between 0.7~0.8, and P is rotor number of poles.
The winding of above-mentioned original poor efficiency threephase asynchronous is corner connection, and the every utmost point of built-in type permanent-magnet rotor comprises one deck permanent magnet layer, has the permanent magnet trough of V-type on this permanent magnet layer, and permanent magnet is positioned at permanent magnet trough bottom, and the outer wall of rotor core is rounded; V-type permanent magnet trough concave point is apart from the ratio of rotor outer surface distance and rotor radius between 0.1~0.4, and the ratio of V-arrangement permanent magnet trough machinery polar arc angle and every extremely shared space angle is between 0.6~0.8.
Said method can also be cleared up or change the part of original threephase asynchronous.
The reproducing method of a kind of poor efficiency threephase asynchronous of the present invention, the asynchronous squirrel-cage rotor of original poor efficiency threephase asynchronous is replaced with to built-in type permanent-magnet rotor, be about to threephase asynchronous and transform built-in permanent-magnet synchronous motor as, make the efficiency rank of the motor after manufacturing again reach IE4 level; After manufacturing, motor nominal load salient pole rate is greater than 1.5 simultaneously again; After manufacturing, motor no-load phase back emf waveform total harmonic distortion is less than 7% again, is more conducive to the position Sensorless Control of low speed and high speed.
The present invention has not only significantly improved the efficiency of original poor efficiency threephase asynchronous, but also has utilized the parts of original poor efficiency threephase asynchronous, thereby makes cheap for manufacturing cost again; Utilize the structure of built-in type permanent-magnet rotor simultaneously, make improved motor be convenient to, by position Sensorless Control, save position transducer, when realizing frequency control raising system effectiveness, further reduced system cost, improved reliability, and reciprocation cycle is short.
The reproducing method of a kind of poor efficiency threephase asynchronous of the present invention, is applicable to poor efficiency threephase asynchronous to transform.
Accompanying drawing explanation
Fig. 1 is the sectional view of individual layer U-shaped interior permanent magnets rotor in embodiment two.
Fig. 2 is the sectional view of Double U interior permanent magnets rotor in embodiment three.
Fig. 3 is the sectional view of V-arrangement interior permanent magnets rotor in embodiment four.
Fig. 4 is the unloaded phase back electromotive force of U-shaped interior permanent magnets rotor oscillogram.
Fig. 5 is the unloaded phase back electromotive force of U-shaped interior permanent magnets rotor waveform harmonics composition schematic diagram.
Fig. 6 is the unloaded phase back electromotive force of V-arrangement interior permanent magnets rotor oscillogram.
Fig. 7 is the unloaded phase back electromotive force of V-arrangement interior permanent magnets rotor waveform harmonics composition schematic diagram.
Embodiment
Embodiment one: the reproducing method of a kind of poor efficiency threephase asynchronous described in present embodiment, the process of the method is: the asynchronous squirrel-cage rotor of original poor efficiency threephase asynchronous is replaced with to built-in type permanent-magnet rotor.
In present embodiment, in the situation that not changing the parts such as original poor efficiency threephase asynchronous stator, axle and end cap, only original asynchronous squirrel-cage rotor is replaced with to built-in type permanent-magnet rotor, in lifting motor efficiency, realize frequency control and position-sensor-free operation.
According to IEC60034-30 (2008) standard, the efficiency rank of the motor after the present invention manufactures again reaches IE4 level, is equivalent to 1 grade of efficiency of GB GB18613-2012, and can further improves system effectiveness by frequency control.Adopt built-in type permanent-magnet rotor structure to improve salient pole rate, and the phase back emf waveform obtaining in conjunction with optimal design, motor after manufacturing again can be realized position-sensor-free operation within the scope of All Speed Range, thereby has further reduced system cost, has improved reliability.
Embodiment two: illustrate present embodiment with reference to Fig. 1, present embodiment is that the reproducing method of a kind of poor efficiency threephase asynchronous described in embodiment one is described further, in present embodiment, the winding of described original poor efficiency threephase asynchronous is that star connects, the every utmost point of built-in type permanent-magnet rotor comprises one deck permanent magnet layer, on this permanent magnet layer, have U-shaped permanent magnet trough, permanent magnet is positioned at permanent magnet trough bottom, the outer wall of rotor core consists of P section eccentric arc, all corresponding one section of eccentric arc of the opening part of each U-shaped permanent magnet trough; The ratio of described eccentric arc radius and rotor radius is between 0.7~0.8, and P is rotor number of poles.
In present embodiment, for winding, be the poor efficiency threephase asynchronous that star connects, adopt U-shaped rotor structure; Permanent magnet is buried in rotor, and adopts individual layer permanent magnet scheme, realizes larger salient pole rate; Rotor core cylindrical adopts eccentric arc structure, utilizes non-uniform gap effectively to weaken each harmonic, at utmost reduces the unloaded phase back electromotive force harmonic wave except 3 and 3 doubly several, realizes good phase back emf waveform, as shown in Figure 4 and Figure 5.
Embodiment three: illustrate present embodiment with reference to Fig. 2, present embodiment is that the reproducing method of a kind of poor efficiency threephase asynchronous described in embodiment one is described further, in present embodiment, the winding of described original poor efficiency threephase asynchronous is that star connects, the every utmost point of built-in type permanent-magnet rotor comprises two-layer permanent magnet layer, on two-layer permanent magnet layer, all have U-shaped permanent magnet trough, permanent magnet is positioned at permanent magnet trough bottom, and two-layer permanent magnet is parallel to each other, the outer wall of rotor core consists of P section eccentric arc, the all corresponding one section of eccentric arc of the opening part of each U-shaped permanent magnet trough in skin, the ratio of described eccentric arc radius and rotor radius is between 0.7~0.8, and P is rotor number of poles.
In present embodiment, for winding, be the poor efficiency threephase asynchronous that star connects, adopt U-shaped rotor structure; Permanent magnet is buried in rotor, and adopts double-deck permanent magnet scheme, realizes larger salient pole rate; Rotor core cylindrical adopts eccentric arc structure, utilizes non-uniform gap effectively to weaken each harmonic, at utmost reduces the unloaded phase back electromotive force harmonic wave except 3 and 3 doubly several, realizes good phase back emf waveform, as shown in Figure 4 and Figure 5.
Embodiment four: illustrate present embodiment with reference to Fig. 3, present embodiment is that the reproducing method of a kind of poor efficiency threephase asynchronous described in embodiment one is described further, in present embodiment, the winding of described original poor efficiency threephase asynchronous is corner connection, the every utmost point of built-in type permanent-magnet rotor comprises one deck permanent magnet layer, on this permanent magnet layer, have the permanent magnet trough of V-type, permanent magnet is positioned at permanent magnet trough bottom, and the outer wall of rotor core is rounded; V-type permanent magnet trough concave point is apart from the ratio of rotor outer surface distance and rotor radius between 0.1~0.4, and the ratio of V-arrangement permanent magnet trough machinery polar arc angle and every extremely shared space angle is between 0.6~0.8.
In present embodiment, the poor efficiency threephase asynchronous that is corner connection for winding, adopts V shape rotor structure.Its permanent magnet is buried in rotor, realizes larger salient pole rate; Rotor is that standard circular radius is R r, by adjusting magnetic pole machinery polar arc angle [alpha] p, and V-arrangement magnet steel geosynclinal concave point is apart from rotor outer surface distance h r, when taking into account weakening each harmonic, farthest reduce multiple subharmonic and all the other each harmonics of 3 and 3, realize good phase back emf waveform, as shown in Figure 6 and Figure 7.
Embodiment five: present embodiment is that the reproducing method of a kind of poor efficiency threephase asynchronous described in embodiment one, two, three or four is described further, in present embodiment, described method can also clear up or change the part of original threephase asynchronous.
In present embodiment,, environmental protection harmless to employings such as aging winding, insulation and bearings, the free of contamination mode of disassembling are done necessary replacing, and are farthest utilized and reclaim original motor parts.The present invention has not only significantly improved the efficiency of original poor efficiency threephase asynchronous, but also has utilized the parts of original poor efficiency threephase asynchronous, thereby makes cheap for manufacturing cost again; Utilize the structure of built-in type permanent-magnet rotor simultaneously, make improved motor be convenient to, by position Sensorless Control, save position transducer, when realizing frequency control raising system effectiveness, further reduced system cost, improved reliability, and reciprocation cycle is short.

Claims (5)

1. a reproducing method for poor efficiency threephase asynchronous, is characterized in that, the process of the method is: the asynchronous squirrel-cage rotor of original poor efficiency threephase asynchronous is replaced with to built-in type permanent-magnet rotor.
2. the reproducing method of a kind of poor efficiency threephase asynchronous according to claim 1, it is characterized in that, the winding of described original poor efficiency threephase asynchronous is that star connects, the every utmost point of built-in type permanent-magnet rotor comprises one deck permanent magnet layer, on this permanent magnet layer, have U-shaped permanent magnet trough, permanent magnet is positioned at permanent magnet trough bottom, and the outer wall of rotor core consists of P section eccentric arc, all corresponding one section of eccentric arc of the opening part of each U-shaped permanent magnet trough; The ratio of described eccentric arc radius and rotor radius is between 0.7~0.8, and P is rotor number of poles.
3. the reproducing method of a kind of poor efficiency threephase asynchronous according to claim 1, it is characterized in that, the winding of described original poor efficiency threephase asynchronous is that star connects, the every utmost point of built-in type permanent-magnet rotor comprises two-layer permanent magnet layer, on two-layer permanent magnet layer, all have U-shaped permanent magnet trough, permanent magnet is positioned at permanent magnet trough bottom, and two-layer permanent magnet is parallel to each other, the outer wall of rotor core consists of P section eccentric arc, all corresponding one section of eccentric arc of the opening part of each U-shaped permanent magnet trough in skin; The ratio of described eccentric arc radius and rotor radius is between 0.7~0.8, and P is rotor number of poles.
4. the reproducing method of a kind of poor efficiency threephase asynchronous according to claim 1, it is characterized in that, the winding of described original poor efficiency threephase asynchronous is corner connection, the every utmost point of built-in type permanent-magnet rotor comprises one deck permanent magnet layer, on this permanent magnet layer, have the permanent magnet trough of V-type, permanent magnet is positioned at permanent magnet trough bottom, and the outer wall of rotor core is rounded; V-type permanent magnet trough concave point is apart from the ratio of rotor outer surface distance and rotor radius between 0.1~0.4, and the ratio of V-arrangement permanent magnet trough machinery polar arc angle and every extremely shared space angle is between 0.6~0.8.
5. according to the reproducing method of a kind of poor efficiency threephase asynchronous described in claim 1,2,3 or 4, it is characterized in that, described method can also clear up or change the part of original threephase asynchronous.
CN201410025367.9A 2014-01-20 2014-01-20 Remanufacturing method for inefficient three-phase asynchronous motor Pending CN103730994A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104052208A (en) * 2014-06-20 2014-09-17 王贤长 Method for transforming three-phase asynchronous motor into permanent magnet motor
CN104201833A (en) * 2014-09-17 2014-12-10 柏科(常熟)电机有限公司 Remanufacturing method for automobile generator
CN106849547A (en) * 2017-03-09 2017-06-13 江苏久知电机技术有限公司 Threephase asynchronous efficient rare-earth permanent magnetism reproducing method
CN110048530A (en) * 2019-04-22 2019-07-23 大连理工大学 A kind of rotor structure and design method of permanent magnetism assist in synchronization reluctance motor

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CN201478968U (en) * 2009-09-04 2010-05-19 湖北西浦电机科技有限责任公司 Sine current self-starting three-phase rare-earth permanent-magnet synchronous motor
CN202840735U (en) * 2012-07-24 2013-03-27 广东美芝精密制造有限公司 Permanent magnet motor rotor structure for compressor
CN203301268U (en) * 2013-05-09 2013-11-20 杭州德沃仕电动科技有限公司 Magnet steel movable built-in permanent magnet motor rotor structure

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CN201478968U (en) * 2009-09-04 2010-05-19 湖北西浦电机科技有限责任公司 Sine current self-starting three-phase rare-earth permanent-magnet synchronous motor
CN202840735U (en) * 2012-07-24 2013-03-27 广东美芝精密制造有限公司 Permanent magnet motor rotor structure for compressor
CN203301268U (en) * 2013-05-09 2013-11-20 杭州德沃仕电动科技有限公司 Magnet steel movable built-in permanent magnet motor rotor structure

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104052208A (en) * 2014-06-20 2014-09-17 王贤长 Method for transforming three-phase asynchronous motor into permanent magnet motor
CN104201833A (en) * 2014-09-17 2014-12-10 柏科(常熟)电机有限公司 Remanufacturing method for automobile generator
CN106849547A (en) * 2017-03-09 2017-06-13 江苏久知电机技术有限公司 Threephase asynchronous efficient rare-earth permanent magnetism reproducing method
CN110048530A (en) * 2019-04-22 2019-07-23 大连理工大学 A kind of rotor structure and design method of permanent magnetism assist in synchronization reluctance motor

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Application publication date: 20140416