CN104578612B - It is a kind of to solve the method that large-scale self-starting rare earth permanent-magnet synchronization motor starts the radiating of cage bar - Google Patents
It is a kind of to solve the method that large-scale self-starting rare earth permanent-magnet synchronization motor starts the radiating of cage bar Download PDFInfo
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- CN104578612B CN104578612B CN201310495768.6A CN201310495768A CN104578612B CN 104578612 B CN104578612 B CN 104578612B CN 201310495768 A CN201310495768 A CN 201310495768A CN 104578612 B CN104578612 B CN 104578612B
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Abstract
The invention discloses a kind of method that large-scale self-starting rare earth permanent-magnet synchronization motor of solution starts the radiating of cage bar, methods described is mainly used in the large-scale self-start permanent magnet synchronous of MW class that starting current impact is big, the startup time is longer, startup cage bar is hatch frame.Specific implementation method is：Melted using low-melting alloy and be seeped into the gap for starting cage bar and rotor core, air-gap, reinforcing capacity of heat transmission of the cage bar to iron core around are eliminated, so as to reach optimal radiating effect.The low-melting alloy used, which is commonly used, metallic tin（Sn）, babbit（ZChSnSb、ZChPbSb）, M51 low-melting alloys etc..
Description
Technical field
The invention belongs to technical field of motors, especially relate to one kind and can solve the problem that large-scale self-starting rare-earth permanent-magnetic synchronous
The effective ways of electric motor starting cage bar radiating.
Background technology
A large amount of in industrial and mining enterprises to use AC asynchronous motor, most of middle low power motor uses and directly initiates mode.
It is simplest start mode to directly initiate, and motor is directly connected on power network by knife switch or contactor during startup.
The advantage of across-the-line starting is that starting equipment is simple, and priming speed is fast, with low cost.But for more than hundreds of kilowatts even to several million
Watt large-size machine using directly initiate mode can to power network produce intense impact, jeopardize the safe and stable operation of power network, so
Typically can not be using directly initiating, it is necessary to start motor by " soft start " mode.Large-size machine is also right using " soft start "
The reliability and service life of motor bring benefit：Influence, reduction of the starting current impact to motor insulation life is reduced to start
During electromagnetic force is to machine winding and starts cage bar and produces mechanical destruction, improves reliability and service life.
Because the shortcoming of asynchronous motor is that inefficient, power factor is not high.It is a kind of efficient as a kind of technological progress
Self-starting rare earth permanent-magnet synchronization motor progressively starts in, high-power field substitutes asynchronous motor, to reach the saving energy
Purpose.Using this motor with respect to for asynchronous motor, efficiency can improve 2~4%, power factor can improve 10%~
15%, the use of this motor is a selection well for industrial and mining enterprises' energy-saving and emission-reduction.
In the manufacturing practice of efficient self-starting rare earth permanent-magnet synchronization motor, because rotor needs to install rare earth permanent magnet magnetic
Steel, for reasons in structure, rotor startup cage bar using fine copper material and is typically cold setting, therefore, the rotor of cage bar and surrounding
There is fit-up gap between iron core.In large-size machine, this fit-up gap maximum can reach 0.2mm.Undoubtedly, this assembling
The presence in gap hinders the cage bar radiating in motor start-up procedure, is hidden some dangers for motor " burning bar " failure.Large-size machine is needed
" soft to open " dynamic, to reduce impact of the starting current to power network, the startup time is long, so, the heat of rotor startup cage bar
Will severe accumulation, it is easy to because 0.2mm fit-up gap has the generation for causing rotor " broken strip " failure.Therefore, how
Solve " broken strip " hidden danger and reformed into during large-scale self-starting rare earth permanent-magnet synchronization motor is manufactured one to face
Problem, the present invention is exactly one of method of solution.
The content of the invention
For the actual conditions of large-scale self-starting rare-earth permanent-magnet electric machine cold setting rotor startup cage bar, the present invention proposes a kind of
Melt the method for oozing filling cage bar fit-up gap using low-melting alloy, solve to start the problem of radiating of cage bar is bad, reach elimination
The purpose of " burning bar " potential faults.
This method is particularly suitable for large-scale self-starting rare-earth permanent-magnet electric machine and manufactured, features simple and practical process.
Rotor typically will first complete the installation and end ring weldering of rotor startup cage bar before thulium permanent magnet is installed
Connect, for large-size machine, cage bar groove profile is open slot, and cage bar is penetrated in groove from rotor one end, is left between cage bar and cage bar groove
About 0.2mm fit-up gap.In order to prevent the activity in cage bar groove of cage bar, general method is to do local punching by open slot
Pressure, makes cage bar produce local deformation, " tensioner " of part is in groove.This method be solve cage bar in cage bar groove from
By activity, it is impossible to improve cage bar to cage bar groove thermal diffusion effect.Therefore, traditional " tensioner " technique can not solve cage bar in motor
" burning bar " problem in start-up course.In fact, be that cage bar and periphery iron core have fit-up gap the reason for " burning bar " generation, from
And cause the heat of cage bar to need to be delivered on the iron core on periphery by this fit-up gap.It is well known that the heat transfer of air
Coefficient is far smaller than the coefficient of heat conduction of metal, if being filled into the gap between cage bar and cage bar groove with metal substitute air
In, the heat of cage bar is just easily delivered in the iron core on periphery, so, and the temperature rise of cage bar is just received greatly
Ground is limited, so that reached elimination " burning bar " therefore normal hidden danger, meanwhile, the effect of fixed cage bar is also achieved, is that motor reduction is made an uproar
Vocal cores is contributed, and is kill two birds with one stone.
The present invention is really a kind of process, the i.e. opening in rotor cage bar groove, with weak flame large area
Baking will melt the position for oozing low-melting alloy, and by cage bar groove opening, the low-melting alloy of thawing is relied on Action of Gravity Field
And capillarity incorporates and is filled into the gap between cage bar and cage bar groove.Low-melting alloy used is that metallic tin such as is closed
Gold, babbit, M51 low-melting alloys etc., alloy melting point scope select at 179 DEG C~240 DEG C, with fine copper, motor silicon
Steel disc wettability can be preferential selection principle well, and mend increases mobile performance with scaling powder.This cementation process that melts belongs to solder bonding metal
Scope, it is understood that for rotor cage bar and cage bar groove are connected together with low-melting alloy soldering, forms an entirety.
Advantages of the present invention：
1st, the air gap low-melting alloy between startup cage bar and cage bar groove iron core, which melts, oozes filling, starts the heat of cage bar
Amount can efficiently be diffused into rotor core, eliminate " burning bar " potential faults of large-scale self-starting rare earth permanent-magnet synchronization motor.
2nd, start cage bar and cage bar groove is brazed together, secure cage bar, reduce operation noise.
3rd, method is simple and easy to apply, and engineering is improved quality, and control is easy, and cost is very cheap.
Brief description of the drawings
Fig. 1 is self-starting rare-earth permanent magnet motor rotor structural representation of the invention.
Fig. 2 is the enlarged drawing of part A in Fig. 1.Wherein：
1- cage bar channel opening 2- rotor cores
The gap started between cage bar 4- cages bar and cage bar groove of 3- fine copper matter
Embodiment
The present invention is described in further detail below, but it is not as a limitation of the invention.
Present invention is used in a 900kW-12 poles -10kV self-starting rare earth permanent-magnet synchronization motors.
Low-melting alloy employed in the present invention can for metallic tin (Sn), babbit (ZChSnSb, ZChPbSb),
M51 low-melting alloys etc., low-melting alloy melting range used is at 179 DEG C~240 DEG C.
Low-melting alloy uses M51, and 179 DEG C of melting temperature, the special scaling powders of adapted M51-F, weld strength is public for 13
Jin/square millimeter.
Heating uses slightly excessive acetylene torch.
M51-F scaling powders are smeared at cage bar opening as shown in Figure 2, are heated using acetylene torch, until solder flux is in light
Huang, during micro-boiling shape, shows that temperature has reached 179 degree or so of temperature (suitably again higher even), is filled out at cage bar opening
M51 alloys are applied, the M51 alloys of melting can be penetrated between cage bar and cage bar groove automatically under gravity and under capillarity
In gap
Welding will persistently be welded from one side to other one side first, in time the supplement M51 alloy dosages of appropriateness.
When one weld seam is welded to the end, initiating terminal heating is returned immediately, and observes weld seam turgor, to there is " contracting is empty " place
M51 alloys are supplied to turgor in time.
Above example is only the exemplary embodiment of the present invention, is not used in the limitation present invention, protection scope of the present invention
It is defined by the claims.
Claims (4)
1. a kind of solve the method that large-scale self-starting rare earth permanent-magnet synchronization motor starts the radiating of cage bar：By the rotor core cage of motor
Bar groove and startup cage bar are brazed together with low-melting alloy, are eliminated the air gap started between cage bar and cage bar groove, are reached
The purpose that the heat for starting cage bar is efficiently spread.
2. the method as described in claim 1, the startup cage bar of rotor is embedded in the cage bar groove of opening, and low melting point is closed
Gold is melted by the opening portion of cage bar groove in the gap for being seeped into and starting between cage bar and cage bar groove, is not by two ends of rotor
Side starts cage bar and what is infiltered melted in the gap of cage bar groove.
3. the method as described in claim 1, the low-melting alloy used closes for metallic tin, babbit or M51 low melting points
Gold, low-melting alloy melting range used is at 179 DEG C~240 DEG C.
4. the method as described in claim 1, soldering uses weak flame, large area baking increases mobility using scaling powder.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310495768.6A CN104578612B (en) | 2013-10-21 | 2013-10-21 | It is a kind of to solve the method that large-scale self-starting rare earth permanent-magnet synchronization motor starts the radiating of cage bar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310495768.6A CN104578612B (en) | 2013-10-21 | 2013-10-21 | It is a kind of to solve the method that large-scale self-starting rare earth permanent-magnet synchronization motor starts the radiating of cage bar |
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| Publication Number | Publication Date |
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| CN104578612A CN104578612A (en) | 2015-04-29 |
| CN104578612B true CN104578612B (en) | 2017-08-25 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101515732A (en) * | 2008-02-22 | 2009-08-26 | 何君 | Rotor structure design for high-speed three-phase asynchronous electric rotary machine and rotary machine |
| CN101557145A (en) * | 2008-04-11 | 2009-10-14 | 上海电气集团上海电机厂有限公司 | Soldering method of conducting ring of motor rotor |
| WO2010100086A1 (en) * | 2009-03-02 | 2010-09-10 | Ferenc Horvath | Short circuit rotor for asynchronous machines having metal-coated rotor slots |
| CN103346656A (en) * | 2013-07-22 | 2013-10-09 | 宁夏西北骏马电机制造股份有限公司 | Improved method of double-cage rotor and double-cage rotor for explosion-proof asynchronous motor |
-
2013
- 2013-10-21 CN CN201310495768.6A patent/CN104578612B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101515732A (en) * | 2008-02-22 | 2009-08-26 | 何君 | Rotor structure design for high-speed three-phase asynchronous electric rotary machine and rotary machine |
| CN101557145A (en) * | 2008-04-11 | 2009-10-14 | 上海电气集团上海电机厂有限公司 | Soldering method of conducting ring of motor rotor |
| WO2010100086A1 (en) * | 2009-03-02 | 2010-09-10 | Ferenc Horvath | Short circuit rotor for asynchronous machines having metal-coated rotor slots |
| CN103346656A (en) * | 2013-07-22 | 2013-10-09 | 宁夏西北骏马电机制造股份有限公司 | Improved method of double-cage rotor and double-cage rotor for explosion-proof asynchronous motor |
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| Publication number | Publication date |
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| CN104578612A (en) | 2015-04-29 |
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