CN103730996B - Variable-frequency adjustable speed three-phase asynchronous motor - Google Patents
Variable-frequency adjustable speed three-phase asynchronous motor Download PDFInfo
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- CN103730996B CN103730996B CN201310462240.9A CN201310462240A CN103730996B CN 103730996 B CN103730996 B CN 103730996B CN 201310462240 A CN201310462240 A CN 201310462240A CN 103730996 B CN103730996 B CN 103730996B
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- 238000004804 winding Methods 0.000 claims abstract description 32
- 239000010410 layer Substances 0.000 claims abstract description 19
- 239000002356 single layer Substances 0.000 claims abstract description 15
- 239000003990 capacitor Substances 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 5
- 230000007935 neutral effect Effects 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 230000005855 radiation Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 3
- 239000002131 composite material Substances 0.000 abstract 4
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The invention provides a variable-frequency adjustable speed three-phase asynchronous motor which comprises a housing, a stator, a rotor, a front end cover, a rear end cover, a cooling fan, a fan housing, a variable-frequency control device and a circuit board. The cooling fan is an axial flow fan and fixed on a rotor shaft. The circuit board is arranged on the rear end cover, and the fan housing covers the rear end cover. The stator adopts a single-layer and double-layer composite winding. A neutral point of the single-layer and double-layer composite winding is grounded through a capacitor and a resistor which are connected in series. The capacitor and the resistor are arranged on the circuit board. The variable-frequency adjustable speed three-phase asynchronous motor adopting the single-layer and double-layer composite low-harmonic winding can effectively remove and weaken phase belt harmonic waves. In addition, wound wires of the single-layer and double-layer composite winding used by the motor can be saved, and a winding process is simplified.
Description
Technical Field
The invention provides a variable-frequency speed-regulating three-phase asynchronous motor, and particularly relates to a variable-frequency speed-regulating three-phase asynchronous motor adopting a novel single-layer and double-layer mixed low-harmonic winding.
Background
The variable frequency speed-regulating three-phase asynchronous motor is a novel driving motor adopted in various countries in the world at present, and can be regulated at will to meet the requirement of a main machine on the rotating speed. The speed regulation is convenient, the protection performance is good, and the energy-saving product is good. Therefore, the usage of the variable frequency speed control motor in developed countries is more than 60%. But the use amount of the variable-frequency speed-regulating motor in China is less than 10% of that of a motor driving system in the beginning, most production plants adopt national common Y, Y2 and Y3 unified design data, an independent fan is added, for example, YVF-132S-4-7.5KW, a single-layer winding is adopted, the waveform distortion rate is very large, serious resonance can be generated at 30HZ and 25HZ, and normal use is influenced.
In addition, some asynchronous motors using double-layer windings can slightly improve the waveform distortion rate, but have the disadvantages of little effect, large wire consumption of the windings and time consumption for winding.
Therefore, the performance of the variable frequency speed regulating motor needs to be improved on the premise of economy by changing the variable frequency speed regulating motor with low cost and high performance on the basis of the prior art.
Disclosure of Invention
The invention provides a variable-frequency speed-regulating three-phase asynchronous motor adopting a novel single-layer and double-layer mixed low-harmonic winding to overcome the problem of resonance.
In order to achieve the purpose, the following scheme is proposed:
a frequency-conversion speed-regulation three-phase asynchronous motor comprises a shell, a stator, a rotor, a front end cover, a rear end cover, a cooling fan, a fan cover, a frequency-conversion control device and a circuit board; wherein,
the heat radiation fan is an axial flow fan and is fixed on the rotor shaft;
the circuit board is arranged on the rear end cover, and the fan cover covers the rear end cover;
the method is characterized in that:
the stator adopts a novel single-layer and double-layer mixed low-harmonic winding mixed winding;
the neutral point of the single-layer and double-layer mixed winding is grounded through a capacitor and a resistor which are connected in series;
the capacitor and the resistor are arranged on the circuit board.
As a further improvement of the above scheme, the fan housing, the front end cover and the rear end cover are provided with vent holes;
further, the frequency conversion control device is arranged on the circuit board;
further, the variable frequency control device is not in common with the capacitor and the resistor.
The invention adopts the novel single-layer and double-layer mixed low-harmonic winding to effectively eliminate or weaken phase band harmonic waves, so that the current harmonic frequency is staggered with the resonance frequency point of the natural frequency of mechanical resonance, and the problem of serious resonance of the variable frequency motor which generates the motor creeping on the ground at a certain frequency is solved and eliminated. Meanwhile, the single-layer and double-layer mixed winding used by the invention can save the winding and simplify the winding process.
Drawings
FIG. 1 is a schematic view of the motor construction of the present invention;
FIG. 2 is an example of a novel single and double layer hybrid low harmonic winding of the present invention;
fig. 3 is a schematic diagram of the low harmonic winding circuit of the present invention.
Detailed Description
In order to facilitate the understanding of the technical solutions of the present invention, the present invention will be described in more detail with reference to fig. 1 to 3.
Referring to fig. 1, a variable frequency speed regulation three-phase asynchronous motor comprises a shell 1, a front end cover 4, a rear end cover 5, a stator 2 arranged on the inner wall of the shell, a rotor shaft and a rotor 3 arranged on the end covers through front and rear bearings, an axial flow fan 7, a fan cover 6, a circuit board 8 arranged on the rear end cover 5 and a variable frequency control device.
The axial flow fan is arranged at the non-shaft-extending end of the rotor shaft, and the fan cover is arranged on the rear end cover and covers the fan and the circuit board. The air hood and the front end cover and the rear end cover are respectively provided with a vent hole, and when the motor works, air flow is sucked from the air hood by the fan, flows through gaps among the rear end cover, the motor stator and the rotor and is finally discharged from the front end cover. The design can enable the air flow to simultaneously cool the variable frequency control device and the circuit board element on the rear end cover, the motor stator and the motor rotor, obtain good motor heat dissipation effect and simultaneously reduce the risk of thermal failure of the variable frequency control device and the element on the circuit board.
The main characteristic of the invention is that the stator adopts a low harmonic single-double layer mixed winding, see figure 2. Wherein fig. 2 illustrates the winding pattern of the present invention in a three-phase 24-slot motor stator, wherein the single and double layer windings are alternately wound off-line every 2 slots. The interaction between the single-layer and double-layer mixed winding live phase lines can effectively inhibit current harmonics and reduce the waveform distortion rate. Compared with a motor with double-layer winding, the winding amount is reduced, and the process is simplified.
Further, referring to fig. 3, the present invention is configured such that a capacitor and a resistor connected in series are connected between a neutral point of a three-phase winding of the variable frequency drive motor and a ground, and parameters of the capacitor and the resistor are appropriately configured, thereby being capable of further reducing current harmonics of a specific number of times in a targeted manner. The capacitor and the resistor are arranged on a circuit board of the rear end cover of the motor.
The frequency conversion control device can be an AC-DC-AC mode power electronic device and a controller thereof, and can be a chopped mode converter and a corresponding controller. The grounding strength and the grounding weakness of the variable frequency control device are separated, and the neutral point grounding of the stator winding is independent. The circuit board of the present invention is fixed to either side of the rear cover, preferably the side facing the fan.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (1)
1. A frequency-conversion speed-regulation three-phase asynchronous motor comprises a shell, a stator, a rotor, a front end cover, a rear end cover, a cooling fan, a fan cover, a frequency-conversion control device and a circuit board; wherein,
the heat radiation fan is an axial flow fan and is fixed on the rotor shaft;
the circuit board is arranged on the rear end cover, and the fan cover covers the rear end cover;
the method is characterized in that:
the stator adopts a single-layer and double-layer mixed winding, and the single-layer and double-layer mixed winding is formed by alternately winding the stator off line at intervals of 2 slots;
the neutral point of the single-layer and double-layer mixed winding is grounded through a capacitor and a resistor which are connected in series;
the electric capacity and the resistance are arranged on the circuit board, the fan cover, the front end cover and the rear end cover are provided with vent holes, a gap is arranged between the stator and the rotor, the frequency conversion control device is arranged on the circuit board, and the frequency conversion control device is not grounded with the electric capacity and the resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310462240.9A CN103730996B (en) | 2013-09-30 | 2013-09-30 | Variable-frequency adjustable speed three-phase asynchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310462240.9A CN103730996B (en) | 2013-09-30 | 2013-09-30 | Variable-frequency adjustable speed three-phase asynchronous motor |
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| Publication Number | Publication Date |
|---|---|
| CN103730996A CN103730996A (en) | 2014-04-16 |
| CN103730996B true CN103730996B (en) | 2014-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310462240.9A Active CN103730996B (en) | 2013-09-30 | 2013-09-30 | Variable-frequency adjustable speed three-phase asynchronous motor |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105262269A (en) * | 2015-11-13 | 2016-01-20 | 乐山三缘电机有限公司 | Heat-radiating three-phase asynchronous motor |
| CN105245074A (en) * | 2015-11-13 | 2016-01-13 | 乐山三缘电机有限公司 | Three-phase asynchronous motor |
| CN105226895A (en) * | 2015-11-13 | 2016-01-06 | 乐山三缘电机有限公司 | A kind of threephase asynchronous of monitoring |
| CN107659098A (en) * | 2017-10-31 | 2018-02-02 | 浙江万时达电机有限公司 | A kind of frequency converting speed regulating three-phase asynchronous electromotor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986513A (en) * | 2010-12-06 | 2011-03-16 | 泰豪科技股份有限公司 | Fractional slot single and double-layer lap winding for servo permanent magnet synchronous motor |
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2013
- 2013-09-30 CN CN201310462240.9A patent/CN103730996B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986513A (en) * | 2010-12-06 | 2011-03-16 | 泰豪科技股份有限公司 | Fractional slot single and double-layer lap winding for servo permanent magnet synchronous motor |
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| CN103730996A (en) | 2014-04-16 |
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