CN210724517U - Rotor structure of variable frequency asynchronous motor - Google Patents
Rotor structure of variable frequency asynchronous motor Download PDFInfo
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- CN210724517U CN210724517U CN201921760288.7U CN201921760288U CN210724517U CN 210724517 U CN210724517 U CN 210724517U CN 201921760288 U CN201921760288 U CN 201921760288U CN 210724517 U CN210724517 U CN 210724517U
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- asynchronous motor
- conducting bar
- variable frequency
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Abstract
The utility model relates to a frequency conversion asynchronous motor rotor structure, including frequency conversion asynchronous motor's rotor conducting bar (1), rotor end links (2), rotor core (3), its characterized in that, rotor conducting bar (1) pass rotor core (3) groove, and rotor core (3) both ends are equipped with one rotor end links (2) respectively, and rotor conducting bar (1) both ends pass rotor end links (2) groove respectively, weld into overall structure with rotor end links (2). The structure can conveniently adjust the copper loss of the rotor conducting bar (1), and the requirement of large slip ratio of the variable frequency asynchronous motor during high-frequency work can be realized by reasonably controlling the ratio of the copper loss of the rotor conducting bar (1) to the stray loss of the rotor.
Description
Technical Field
The utility model discloses the project belongs to aviation motor design technical field.
Background
The common AC motor for the airplane is a three-phase asynchronous motor with constant frequency of 400Hz and constant voltage of 115V/200V. The novel airplane adopts a variable frequency power supply system, and a three-phase asynchronous motor with constant voltage in the frequency range of 360-650 Hz and 115V/200V is adopted. The synchronous speed and the frequency of the asynchronous motor are in a strict direct proportional relation, namely the higher the frequency is, the higher the speed is, but the rotating speed of the motor is not required to be too high when the aircraft electric equipment is actually used, and the rotating speed of the three-phase asynchronous motor is required to be reduced at high frequency, namely the rotating speed is large, so that a special design is required.
Disclosure of Invention
The utility model aims at: a method for realizing large slip ratio of the aviation variable frequency asynchronous motor during high-frequency work is found.
The technical scheme of the utility model is that: the rotor structure of the variable frequency asynchronous motor comprises a rotor conducting bar 1, a rotor end ring 2 and a rotor iron core 3 of the variable frequency asynchronous motor, wherein the rotor conducting bar 1 penetrates through a rotor iron core 3 groove, the two ends of the rotor iron core 3 are respectively provided with the rotor end ring 2, and the two ends of the rotor conducting bar 1 respectively penetrate through the rotor end ring 2 groove and are welded with the rotor end ring 2 to form an integral structure.
The rotor core 3 has a deep slot structure. The groove shape of the rotor core 3 groove is a long trapezoid extending from the outer circle of the rotor core 3 to the center of the rotor core 3. The rotor core 3 slot is the skewed slot structure. The material of the rotor bar 1 is copper. The material of the rotor end ring 2 is copper.
The utility model has the advantages that: the requirement of large slip ratio of the variable frequency asynchronous motor during high-frequency work can be realized.
Drawings
Fig. 1 is a schematic structural diagram of the present patent.
Detailed Description
The present invention will be described in further detail below.
The synchronous speed of the three-phase asynchronous motor is n 1-60 f/P, f is the power frequency, P is the number of pole pairs of the motor, when the structure of the motor is determined, P is a determination parameter, and when the frequency f is also determined, the speed n1 is also determined, which is called the synchronous speed of the motor. The motor rotor shaft speed n2 is (1-S) × n1, S is called slip, and as S is larger, n2 is smaller. And S is PCU2/(PCU2 plus SIGMA P) is 1/(1 plus SIGMA P/PCU2), SIGMA P is all stray loss of the rotor of the motor, when the structure and the working state of the motor are determined, the change is not large, and PCU2 is copper loss of the rotor conducting bar 1. The motor rotor usually adopts a cast aluminum structure mode, and the structure cannot meet the requirement of large slip ratio. The rotor conducting bar 1 and the rotor end ring 2 are changed from cast aluminum to welding of the rotor copper bar 1 and the rotor end ring 2, and the requirement of large slip ratio of the variable frequency asynchronous motor during high-frequency work can be realized by reasonably controlling the ratio of the copper loss of the rotor conducting bar 1 and the stray loss of the rotor.
The utility model discloses a shape in 3 grooves on rotor core is the deep trouth structure, and the cell type is for following 3 excircles on the rotor core to the long trapezoidal of centre of a circle direction, when rotor conducting bar 1 leads to with alternating current, and the current distribution that appears on the conductor cross-section is inhomogeneous, and current density is increased to the surface by the conductor center gradually, and most electric current only flows along the conductor top layer, and the frequency of electric current is higher more, and rotor conducting bar 1 leakage reactance is big more. The leakage reactance at the bottom of the groove is large, and the current is small; the notch leakage reactance is small, and the current is large. Because the current is unevenly distributed, the effective area of the equivalent rotor conducting bar 1 is reduced, the resistance of the rotor conducting bar 1 is increased, the structural mode can effectively adjust the copper loss of the rotor, namely adjust the slip ratio, and finally achieve the purpose of adjusting the rotating speed.
As shown in fig. 1, a rotor bar 1 of the variable frequency asynchronous motor passes through a rotor core 3 slot, and both ends of the rotor bar 1 are respectively welded in a rotor end ring 2 slot at both ends of the core, thus the rotor core 3, the rotor bar 1 and the rotor end ring 2 are integrated. The rotor conducting bar 1 and the rotor end ring 2 are changed from cast aluminum into copper bars and welded with the end ring, the structure can conveniently adjust the copper loss of the rotor conducting bar 1, and the requirement of large slip ratio of the variable frequency asynchronous motor during high-frequency work can be realized by reasonably controlling the ratio of the copper loss of the rotor conducting bar 1 and the stray loss of the rotor.
Claims (6)
1. The rotor structure of the variable frequency asynchronous motor comprises a rotor conducting bar (1), a rotor end ring (2) and a rotor iron core (3) of the variable frequency asynchronous motor, and is characterized in that the rotor conducting bar (1) penetrates through a groove of the rotor iron core (3), the two ends of the rotor iron core (3) are respectively provided with the rotor end ring (2), and the two ends of the rotor conducting bar (1) respectively penetrate through the groove of the rotor end ring (2) and are welded with the rotor end ring (2) to form an integral structure.
2. The variable frequency asynchronous motor rotor structure according to claim 1, characterized in that: the rotor core (3) groove is of a deep groove structure.
3. The variable frequency asynchronous motor rotor structure according to claim 1, characterized in that: the groove shape of the rotor core (3) groove is a long trapezoid extending from the excircle of the rotor core (3) to the circle center direction of the rotor core (3).
4. The variable frequency asynchronous motor rotor structure according to claim 1, characterized in that: the rotor iron core (3) groove is a skewed slot structure.
5. The variable frequency asynchronous motor rotor structure according to claim 1, characterized in that: the rotor conducting bar (1) is made of copper.
6. The variable frequency asynchronous motor rotor structure according to claim 1, characterized in that: the material of the rotor end ring (2) is copper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921760288.7U CN210724517U (en) | 2019-10-18 | 2019-10-18 | Rotor structure of variable frequency asynchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921760288.7U CN210724517U (en) | 2019-10-18 | 2019-10-18 | Rotor structure of variable frequency asynchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210724517U true CN210724517U (en) | 2020-06-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921760288.7U Active CN210724517U (en) | 2019-10-18 | 2019-10-18 | Rotor structure of variable frequency asynchronous motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210724517U (en) |
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2019
- 2019-10-18 CN CN201921760288.7U patent/CN210724517U/en active Active
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