CN210693676U - Variable magnetic field rotating electric machine - Google Patents
Variable magnetic field rotating electric machine Download PDFInfo
- Publication number
- CN210693676U CN210693676U CN201921942747.3U CN201921942747U CN210693676U CN 210693676 U CN210693676 U CN 210693676U CN 201921942747 U CN201921942747 U CN 201921942747U CN 210693676 U CN210693676 U CN 210693676U
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- rotor
- magnetic field
- variable magnetic
- shaft
- rotor shaft
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Abstract
The utility model provides a variable magnetic field rotating electrical machine, include: the stator is fixedly arranged in the shell; a rotor; rotor shaft, rotor housing establish on rotor shaft, rotor shaft's front end is equipped with output gear, produces axial force during output gear and the transmission of second gear engagement, and axial force effect makes rotor shaft drive rotor axial displacement together on rotor shaft, changes the axial position of rotor for the stator, the utility model discloses a variable magnetic field rotating electrical machines utilizes the axial force that produces to promote rotor shaft axial displacement when output gear and other gear engagement transmissions installed on the rotor shaft, changes the relative position of rotor and stator, weakens magnetic flux and back electromotive force to increase the maximum rotational speed.
Description
[ technical field ]
The utility model relates to a variable magnetic field rotating electrical machines.
[ background art ]
The existing permanent magnet driving motor for the vehicle requires a wide constant power area. However, when the motor speed is increased to a certain speed and the back electromotive force is equal to the power supply voltage, the speed is difficult to further increase, and the performance of the system is greatly limited.
In the conventional variable field motor, for example, the magnetic flux is reduced by axially moving the rotor out of the stator or by moving the stator so that the overlapping portion of the stator and the core of the rotor is reduced, thereby reducing the back electromotive force and enabling the increase of the rotation speed.
However, in the known variable field motor, in order to realize the axial movement of the rotor or the stator, a large axial force needs to be overcome, a large movement actuator needs to be provided, and a large amount of energy is consumed. Therefore, it is also desired to provide a high-performance variable field rotating electrical machine that is compact.
[ contents of utility model ]
In order to overcome the problems existing in the prior art, the utility model provides a variable magnetic field rotating motor.
The utility model discloses a variable magnetic field rotating electrical machines, include: the stator is fixedly arranged in the shell; a rotor; the rotor shaft is sleeved with the rotor, an output gear is arranged at the front end of the rotor shaft, axial force is generated when the output gear and a second gear are in meshed transmission, the axial force acts on the rotor shaft to enable the rotor shaft to carry the rotor to move axially together, and the axial position of the rotor relative to the stator is changed.
Preferably, the rotor has two extreme positions, a first position in which the magnetic flux is at a minimum and a second position in which the magnetic flux is at a maximum, the rotor being steplessly movable under the action of the axial force between the first and second positions.
Preferably, the first position is set according to a maximum rotation speed of the variable magnetic field rotating electric machine; the second position is set according to a maximum torque of the variable-field rotating electrical machine.
Preferably, when the rotation speed of the rotor is zero, the rotor is located at the first position, and the rotor moves from the first position to the second position as the output torque of the variable magnetic field rotating electrical machine increases; when the rotation speed of the rotor increases to such an extent that the output power of the variable magnetic field rotary electric machine reaches a maximum value, the rotor moves from the second position to the first position as the output torque of the variable magnetic field rotary electric machine decreases.
Preferably, the rotating shaft is supported on the casing by a bearing, and the rotor is sleeved on the rotating shaft and can drive the rotating shaft to rotate and axially move on the rotating shaft.
Preferably, an oil chamber and a spring are further arranged between the rotating shaft and the rotor shaft, and the damping force generated by oil in the oil chamber, the spring force generated by the spring and the axial force jointly determine the axial position of the rotor shaft relative to the rotating shaft.
Preferably, the oil chamber includes a first oil chamber and a second oil chamber which communicate through a damping hole.
Preferably, the tooth width of the output gear is equal to the sum of the axial moving distance of the rotor shaft and the tooth width of the second gear.
Preferably, the axial position sensor is arranged between the machine shell and the rotor shaft and used for detecting the axial position of the rotor shaft.
Preferably, the device further comprises a rotor position sensor arranged between the casing and the rotating shaft and used for detecting the angular position of the rotor.
Compared with the prior art, the utility model discloses a variable magnetic field rotating electrical machines utilizes the output gear installed on the rotor shaft and the axial force that produces when other gear engagement transmissions to remove the rotor shaft, and then changes the relative position of rotor and stator, weakens magnetic flux and back electromotive force to increase the highest rotational speed.
[ description of the drawings ]
Fig. 1 is a schematic structural view of a variable magnetic field rotating electrical machine according to an embodiment of the present invention;
fig. 2 is a schematic view of the output characteristics of the variable magnetic field rotating electrical machine according to the embodiment of the present invention;
fig. 3 is a schematic structural view of a variable magnetic field rotating electrical machine according to another embodiment of the present invention, in which a rotor is moved to a first position;
fig. 4 is a schematic view of the structure of the variable magnetic field rotating machine of the embodiment shown in fig. 3, in which the rotor is moved to a second position.
[ detailed description of the invention ]
To make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, a variable magnetic field rotating electric machine 100 includes: a stator 11 fixed in a casing (not shown); a rotor 12; the rotor shaft 13, rotor 12 cover is established on rotor shaft 13, and the front end of rotor shaft 13 is equipped with output gear 131, and output gear 131 produces axial force when meshing transmission with second gear 14, and axial force acts on rotor shaft 13 and makes rotor shaft 13 drive rotor 12 and move axially together, changes the axial position of rotor 12 relative to stator 11.
The axial force generated by gear engagement is utilized, external energy is not needed, so that the rotor shaft 13 is pushed to drive the rotor 12 to axially move together, the axial position of the rotor 12 relative to the stator 11 is changed, magnetic flux is reduced, the highest rotating speed is improved, a constant power area is expanded, and the miniaturized high-performance variable magnetic field rotating motor is obtained.
As shown in fig. 2, the rotor 12 preferably has two extreme positions, a first position P1 where the magnetic flux is minimum and a second position P2 where the magnetic flux is maximum, and the rotor 12 is steplessly movable under the action of an axial force between the first position P1 and the second position P2. The rotor 12 can also be moved in stages under the action of axial force between the first position P1 and the second position P2, i.e. several positions are also provided between the first position P1 and the second position P2, to which positions the rotor 12 is moved, which can be chosen according to the specific circumstances and is not limited thereto.
Preferably, the first position P1 is based on the maximum rotation speed n of the variable-field rotating electric machine 100maxSetting; the second position P2 rotates the maximum torque T of the motor 100 according to the variable magnetic fieldmaxAnd (4) setting. When the core of the rotor 12 is fully axially coincident with the core of the stator 11, which is the position where the magnetic flux is maximum, the required maximum torque can be achieved. When the rotor 12 core axially coincides with the core part of the stator 11, e.g. 50%, the maximum rotation speed can be increased to twice that of the full overlap, which can be selected according to specific situations and is not limited to this.
Preferably, when the rotation speed of the rotor 12 is zero, the rotor 12 is located at the first position P1, and as the output torque of the variable-field rotating electric machine 100 increases, the rotor 12 moves from the first position P1 to the second position P2; when the rotation speed of the rotor 12 increases to such an extent that the output power of the variable-field rotating electric machine 100 reaches the maximum value, the rotor 12 moves from the second position P2 to the first position P1 as the output torque of the variable-field rotating electric machine 100 decreases.
For example, when the vehicle is started and accelerated, the rotational speed of the rotor 12 is zero when the vehicle is stationary, the rotor 12 is located at the first position P1, the output torque of the variable-field rotating electric machine 100 is gradually increased and the axial force of the output gear 131 is gradually increased as the accelerator pedal is depressed, the rotor 12 moves from the first position P1 to the second position P2, and when the rotor 12 moves to the second position P2, the torque reaches the maximum torque Tmax(ii) a The output power of the variable-field rotating electric machine 100 reaches the maximum value P when the rotation speed of the rotor 12 increases to reach the maximum value PmaxWhen the rotor 12 moves from the second position P2 to the first position P1, the reduction of the magnetic flux causes the back electromotive force to be reduced, and when the rotor 12 reaches the first position P1, the rotating speed is increased to the maximum rotating speed nmax。
When the accelerator pedal is held at a certain opening degree, the rotor 12 is held at a certain position P intermediate between the first position P1 and the second position P2, and the rotation speed thereof is increased to such a degree that the output power of the variable-field rotating electric machine 100 reaches the maximum value PmaxAt this time, the output torque is reduced and the rotor 12 moves toward the first position P1 until the first position P1 is reached, achieving the maximum speed nmax。
It should be noted that the output characteristics of the variable magnetic field rotating electric machine 100 may be other types, and may be set according to actual needs, without being limited thereto.
As shown in fig. 3 and 4, the method further includes: the rotating shaft 15 is supported on a casing (not shown) by a bearing, and the rotor shaft 13 is sleeved on the rotating shaft 15 and can drive the rotating shaft 15 to rotate together and can axially move on the rotating shaft 15. The rotor shaft 13 is rotatable and axially movable, for this purpose, a rotating shaft 15 is provided, which is supported on the casing by a bearing, and the rotor shaft 13 is sleeved on the rotating shaft, which not only drives the rotating shaft 15 to rotate, but also axially movable on the rotating shaft 15, thereby realizing the support of the axially movable rotor shaft 13, but not limited thereto.
Preferably, an oil chamber 16 and a spring 17 are further provided between the rotating shaft 15 and the rotor shaft 13, and the damping force generated by the oil in the oil chamber 16, the spring force generated by the spring 17 and the axial force of the output gear 131 together determine the axial position of the rotor shaft 13 relative to the rotating shaft 15. An oil chamber 16 is provided in the axial direction on the rotor shaft 13 or the rotary shaft 15, and seal rings are provided at both ends. The oil chamber 16 is filled with oil to provide the required axial damping force during axial movement of the rotor shaft 13 relative to the shaft 15 to limit the speed of movement, avoid oscillations and filter out fluctuations in the axial force of the output gear 131. Other methods of generating damping force are possible and not limited thereto.
One end of a spring 17 sleeved on the rotating shaft 15 abuts against a limiting block on the rotating shaft 15, and the other end abuts against the rotor shaft 13, so that the axial position of the rotor shaft 13 relative to the rotating shaft 15 is determined after elastic thrust and the axial force of the output gear 131 are applied. The spring 17 may be a cylindrical coil spring, and the pitch thereof may be constant or variable, i.e. a spring with variable characteristics, and other types of springs are possible without limitation.
Preferably, oil chamber 16 includes a first oil chamber 161 and a second oil chamber 162 that communicate through a damping hole 163. A boss may be provided on the rotating shaft 15 to divide the oil chamber into a first oil chamber and a second oil chamber, and an annular gap is left between the top of the boss and the rotor shaft 13 as a damping hole 163, so that when the rotor shaft 13 moves relative to the rotating shaft 15, oil may enter the second oil chamber 162 from the first oil chamber 161 through the damping hole 163 or vice versa, thereby providing a damping force. The size of the damping hole 163 may be set according to actual needs, and other methods for providing the required damping force are also possible, but not limited thereto.
Preferably, the tooth width of the output gear 131 is equal to the sum of the axial moving distance of the rotor shaft 13 and the tooth width of the second gear 14. The tooth widths of a pair of meshing gears are typically set according to the maximum load capacity. However, since the output gear 131 moves axially together with the rotor shaft 13, the tooth width of the output gear 131 is equal to the tooth width of the second gear 14 plus the axial movement distance of the rotor shaft 13, but not limited thereto. For example, the width of the second gear 14 may be determined according to the bearing capacity, and when the output gear 131 moves axially to the first position P1, the rotational speed of the motor is high and the torque is small, so that the bearing capacity corresponding to the tooth width of the second gear 14 is not required, and 2/3-1/2 of the tooth width of the second gear 14 may be selected according to practical situations, and the axial moving distance of the rotor shaft 13 is used as the tooth width of the output gear 131, so as to reduce the axial length and the volume.
Preferably, an axial position sensor (not shown) is further included, disposed between the casing and the rotor shaft 13, for detecting the axial position of the rotor shaft 13. The axial position sensor may be a hall position sensor, but is not limited thereto.
Preferably, a rotor position sensor (not shown) is further included, which is disposed between the housing and the rotary shaft 15, for detecting the angular position of the rotor 13. The rotor position sensor may be, but is not limited to, a resolver.
The above-mentioned embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A variable magnetic field rotating electrical machine, comprising:
the stator is fixedly arranged in the shell; a rotor; the rotor shaft is sleeved with the rotor, an output gear is arranged at the front end of the rotor shaft, axial force is generated when the output gear and a second gear are in meshed transmission, the axial force acts on the rotor shaft to enable the rotor shaft to carry the rotor to move axially together, and the axial position of the rotor relative to the stator is changed.
2. The variable magnetic field rotating electrical machine according to claim 1,
the rotor has two extreme positions, a first position in which the magnetic flux is minimal and a second position in which the magnetic flux is maximal, the rotor being steplessly movable under the influence of the axial force between the first and second positions.
3. The variable magnetic field rotating electrical machine according to claim 2,
the first position is set according to a maximum rotation speed of the variable magnetic field rotating motor;
the second position is set according to a maximum torque of the variable-field rotating electrical machine.
4. The variable magnetic field rotating electrical machine according to claim 3,
when the rotation speed of the rotor is zero, the rotor is located at the first position, and the rotor moves from the first position to the second position along with the increase of the output torque of the variable magnetic field rotating motor; when the rotation speed of the rotor increases to such an extent that the output power of the variable magnetic field rotary electric machine reaches a maximum value, the rotor moves from the second position to the first position as the output torque of the variable magnetic field rotary electric machine decreases.
5. The variable magnetic field rotating electrical machine according to claim 4, further comprising:
the rotating shaft is supported on the casing through a bearing, and the rotor is sleeved on the rotating shaft and can drive the rotating shaft to rotate and axially move on the rotating shaft.
6. The variable magnetic field rotating electrical machine according to claim 5,
an oil cavity and a spring are further arranged between the rotating shaft and the rotor shaft, and the damping force generated by oil in the oil cavity, the spring force generated by the spring and the axial force jointly determine the axial position of the rotor shaft relative to the rotating shaft.
7. The variable magnetic field rotating electrical machine according to claim 6,
the oil chamber comprises a first oil chamber and a second oil chamber which are communicated through a damping hole.
8. The variable magnetic field rotating electrical machine according to claim 6,
the tooth width of the output gear is equal to the sum of the axial moving distance of the rotor shaft and the tooth width of the second gear.
9. The variable magnetic field rotating machine according to claim 6, further comprising an axial position sensor disposed between a casing and the rotor shaft for detecting an axial position of the rotor shaft.
10. The variable magnetic field rotating machine according to claim 6, further comprising a rotor position sensor disposed between the casing and the rotating shaft for detecting an angular position of the rotor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921942747.3U CN210693676U (en) | 2019-11-12 | 2019-11-12 | Variable magnetic field rotating electric machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921942747.3U CN210693676U (en) | 2019-11-12 | 2019-11-12 | Variable magnetic field rotating electric machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210693676U true CN210693676U (en) | 2020-06-05 |
Family
ID=70886339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921942747.3U Expired - Fee Related CN210693676U (en) | 2019-11-12 | 2019-11-12 | Variable magnetic field rotating electric machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210693676U (en) |
-
2019
- 2019-11-12 CN CN201921942747.3U patent/CN210693676U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211116 Address after: 518000 1604, block B, smart home, No. 76, Baohe Avenue, Baolong street, Longgang District, Shenzhen City, Guangdong Province Patentee after: SHENZHEN XINGKANG POWERTRAIN CO.,LTD. Address before: 518000 room 1104, building 12, Pu'an garden, No. 5, Pengfei Road, Dapeng new area, Shenzhen, Guangdong Patentee before: Zeng Haowen |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200605 Termination date: 20211112 |