CN216929718U - Ferrite auxiliary synchronous reluctance motor rotor structure - Google Patents
Ferrite auxiliary synchronous reluctance motor rotor structure Download PDFInfo
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- CN216929718U CN216929718U CN202220758860.1U CN202220758860U CN216929718U CN 216929718 U CN216929718 U CN 216929718U CN 202220758860 U CN202220758860 U CN 202220758860U CN 216929718 U CN216929718 U CN 216929718U
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Abstract
The utility model discloses a rotor structure of a ferrite auxiliary synchronous reluctance motor, which is optimally designed from the aspects of ferrite arrangement, magnetic barrier layer distribution, magnetic barrier size, magnetic barrier opening angle design and the like of a magnetic barrier layer and a rotor area, guides the magnetomotive force direction to improve the reactive power utilization rate and the magnetomotive force utilization rate, and can improve the power factor and the power density of the ferrite auxiliary synchronous reluctance motor.
Description
Technical Field
The utility model relates to the technical field of motors, in particular to a ferrite auxiliary synchronous reluctance motor rotor structure.
Background
The synchronous reluctance motor is an alternating current motor which follows the principle of reluctance minimum path closing and generates magnetic pull force to drive the motor to rotate through reluctance change caused by different positions of a rotor. It has the advantages of simple structure, firmness, durability, high efficiency, wide speed regulation range, low cost and the like. The stator magnetic field of the synchronous reluctance motor is a sine wave rotating magnetic field, and the stator generally adopts the stator structure of the traditional three-phase alternating current motor. The rotor structure of the synchronous reluctance motor is special, and the rotor is provided with a plurality of slots, so that a quadrature-direct axis magnetic circuit of the motor generates huge reluctance difference and presents strong salient polarity, and driving torque with reluctance property is generated.
Compared with a common synchronous reluctance motor, the ferrite auxiliary synchronous reluctance motor has the advantages that the ferrite is contained in the rotor, and the magnetic circuit and the saturation degree of the ferrite auxiliary synchronous reluctance motor are changed. The ferrite auxiliary synchronous reluctance motor has the characteristics of a synchronous reluctance motor and a permanent magnet motor, has the advantages of low cost, simplicity in processing and manufacturing and high torque density, and also has the defect of large torque pulsation. Therefore, the suppression of the torque ripple of the ferrite auxiliary synchronous reluctance motor is a difficult problem which can not be avoided by engineering technicians. At present, in the aspect of torque ripple suppression of ferrite auxiliary synchronous reluctance motors at home and abroad, torque ripple is mainly suppressed by adjusting the opening angle of the tail end of a magnetic barrier, changing the arrangement and the shape of a ferrite, selecting a proper winding form and the like. However, the above optimization has not yet formed a systematic design theory.
Disclosure of Invention
The utility model aims to solve the defects in the prior art, provides the rotor structure of the ferrite auxiliary synchronous reluctance motor, and aims to combine the characteristics of the ferrite auxiliary synchronous reluctance motor, optimally design the rotor structure from the aspects of ferrite arrangement and magnetic barrier size, and change the magnetomotive force direction, so that the reactive power utilization rate and the magnetomotive force utilization rate are improved, and further the power factor and the power density of the ferrite auxiliary synchronous reluctance motor can be improved.
In order to achieve the purpose of the utility model, the utility model adopts the following technical scheme:
the utility model relates to a rotor structure of a ferrite auxiliary synchronous reluctance motor.A d-axis coordinate system and a q-axis coordinate system which are synchronous with a rotor are established on a motor rotor of a 4-pole ferrite auxiliary synchronous reluctance motor; the positive direction of the d axis is the direction of the magnetic field of the rotor from the N pole to the S pole, and the included angle between the q axis and the d axis is 45 degrees, so that two pairs of d and q axes formed on the rotor of the motor are respectively marked as a d1 axis, a d2 axis, a q1 axis and a q2 axis; the two pairs of d and q shafts divide the motor rotor into eight 45-degree areas around the central axis of the motor; the opening angle of the air magnetic barrier is an included angle between an air magnetic barrier layer on which the permanent magnets are embedded and an air magnetic barrier layer on which the permanent magnets are not embedded on the motor rotor; the structure is characterized in that:
n rectangular parallelepiped ferrites are respectively arranged in the direction of the d1 axis in n air magnetic barrier layers in 2 45-degree regions between the d1 axis and the q2 axis;
n rectangular parallelepiped ferrites are respectively arranged in the direction of the d2 axis in n air magnetic barrier layers in 2 45-degree regions between the d2 axis and the q1 axis;
arranging n layers of rotor areas and n layers of air magnetic barrier layers at intervals, and arranging a cuboid ferrite on the rotor area between two adjacent air magnetic barrier layers, so that n-1 cuboid ferrites are arranged on the rotor area; the rectangular ferrite in the air magnetic barrier and the rectangular ferrite on the rotor area are vertically distributed;
the lengths of the long ferrites in the air magnetic barrier layer are sequentially increased from the axis of the rotor outwards, and the lengths of the cuboid ferrites on the rotor area are equal;
n rectangular ferrites which are equal in length and are distributed in parallel are respectively arranged in n air magnetic barrier layers in 2 regions of 45 degrees between the d1 axis and the q1 axis;
n rectangular ferrites which are equal in length and are distributed in parallel are respectively arranged in n air magnetic barrier layers in 2 regions of 45 degrees between the d2 axis and the q2 axis;
the rectangular solid-like ferrites distributed vertically in the 45-degree region between the q2 axis and the d1 axis and the rectangular solid-like ferrites distributed in parallel alignment in the 45-degree region between the d1 axis and the q1 axis jointly form the layout of all the rectangular solid-like ferrites in the 90-degree region;
the rectangular solid-like ferrites distributed vertically in the 45-degree region between the q1 axis and the d2 axis and the rectangular solid-like ferrites distributed in parallel alignment in the 45-degree region between the d2 axis and the q2 axis jointly form the layout of all the rectangular solid-like ferrites in the 90-degree region;
in four 90-degree regions divided by q1 axes and q2 axes, four types of air magnetic barrier opening angles in four 45-degree regions of two adjacent 90-degree regions are different in size, the air magnetic barrier opening angles of each type are the same in size, and the air magnetic barrier opening angle of a 180-degree region formed by two adjacent 90-degree regions and the air magnetic barrier opening angle of another 180-degree region are in a rotational symmetry relationship.
Compared with the prior art, the utility model has the beneficial effects that:
1. according to the utility model, by combining the characteristics of the ferrite auxiliary synchronous reluctance motor, the rotor structure is optimally designed in terms of ferrite arrangement and magnetic barrier size, a multilayer structure combining the magnetic conduction layer and the magnetic barrier layer is adopted, and the ferrites with specific position structures are arranged in the magnetic conduction layer and the magnetic barrier layer, so that the shape of the symmetrical magnetic barrier is changed, the problem of low magnetomotive force utilization rate in the prior art is solved, and the effect of improving the power factor of the ferrite auxiliary synchronous reluctance motor is achieved.
2. The utility model adopts unique ferrite arrangement, so that higher d-axis and q-axis inductance difference is obtained under a specific ferrite deflection angle, and higher torque density and power factor are obtained. The rectangular parallelepiped-shaped ferrites distributed vertically in the 45 ° region between the q1 axis and the d2 axis, and the rectangular parallelepiped-shaped ferrites distributed in parallel alignment in the 45 ° region between the d2 axis and the q2 axis together form the layout of all the rectangular parallelepiped-shaped ferrites in the 90 ° region. In four 90-degree areas divided by the q1 axis and the q2 axis, the ferrite arrangement sizes are completely the same. The ferrites distributed in parallel in the air magnetic barrier are used for adjusting the magnetomotive force direction, so that the magnetomotive force direction is magnetized along the d axis, the d axis current is reduced, the reactive power consumption is reduced, and the power factor is improved; the ferrites which are vertically distributed and positioned in the rotor area are magnetized along the q-axis direction, so that the q-axis current can be reduced, the magnetomotive force utilization rate is improved, and the power factor and the torque density are improved.
3. According to the utility model, the opening angles of the magnetic barriers are changed, the opening angle relationship of each magnetic barrier is that four types of air magnetic barrier opening angles in four 90-degree areas divided by an axis q1 and an axis q2 are different from one another in four 90-degree areas divided by an axis q1 and an axis q2, four 45-degree areas of two adjacent 90-degree areas are different in size, the opening angle of each type of air magnetic barrier is the same, the air magnetic barrier opening angle of the 180-degree area formed by two adjacent 90-degree areas and the air magnetic barrier opening angle of the other 180-degree area are in a rotational symmetry relationship, the asymmetric magnetic barriers change magnetic conductance distribution and present an uneven characteristic, the associated torque phases of the two areas are changed, and the problem of large torque pulsation caused by the adoption of a symmetric magnetic barrier structure of a conventional permanent magnet assisted synchronous reluctance motor rotor is solved, so that the torque pulsation of the ferrite assisted synchronous reluctance motor is reduced.
Drawings
FIG. 1 is a general schematic view of a rotor structure according to the present invention;
reference numbers in the figures: 1 an air magnetic barrier layer; 2 a rotor region; 3 rectangular ferrites distributed in parallel in the air magnetic barrier layer; 4 rectangular ferrite vertically distributed in the air magnetic barrier layer; 5 rectangular ferrite vertically distributed in the rotor area; 6 hollow part of rotor shaft.
Detailed Description
In the embodiment, compared with the rotor structure of the traditional synchronous reluctance motor, the rotor structure of the ferrite-assisted synchronous reluctance motor has the advantages that the ferrites are skillfully arranged, and the salient pole ratio and the inductance difference between the d axis and the q axis of the rotor structure can meet the industrial requirements; the performance of the rotor structure of the ferrite auxiliary synchronous reluctance motor in all aspects can be close to the performance level of the rotor of the rare earth permanent magnet synchronous reluctance motor. Specifically, firstly, a d-axis and q-axis coordinate system synchronous with a rotor is established on a motor rotor of the 4-pole ferrite auxiliary synchronous reluctance motor, a 2-pole motor has a pair of d-axis and q-axis, and a 4-pole motor has two pairs of d-axis and q-axis, as shown in fig. 1, q1, q2, d1 and d2 axes; the positive direction of the d axis (including the d1 axis and the d2 axis) is the direction of a rotor magnetic field from an N pole to an S pole, and the included angle between the q axis and the d axis is 45 degrees, so that two pairs of d and q axes formed on the motor rotor are respectively marked as a d1 axis, a d2 axis, a q1 axis and a q2 axis; the two pairs of d and q shafts divide a motor rotor into eight 45-degree areas around the central axis of the motor; the opening angle of the air magnetic barrier is an included angle between an air magnetic barrier layer on which the permanent magnet is embedded and an air magnetic barrier layer on which the permanent magnet is not embedded on the motor rotor;
in the n layers of the air magnetic barrier layer 1 in 2 areas of 45 degrees between the d1 axis and the q2 axis, n rectangular parallelepiped ferrites 4 are respectively arranged along the direction of the d1 axis, as shown in fig. 1, one end point of the rectangular parallelepiped ferrites 4 in the parallel position is on the d1 axis, the magnetomotive direction can be adjusted, and the effect of improving the torque density and the power factor is achieved;
n rectangular parallelepiped ferrites 4 are respectively arranged in the n layers of air magnetic barrier layers 1 in 2 45-degree areas between the d2 axis and the q1 axis along the direction of the d2 axis, as shown in fig. 1, one end point of the rectangular parallelepiped ferrites 4 in parallel positions is on the d2 axis, the magnetomotive force direction can be adjusted, and the effect of improving the torque density and the power factor is achieved;
n layers of rotor areas 2 and n layers of air magnetic barrier layers 1 are arranged at intervals, and a cuboid ferrite is arranged on the rotor area 2 between the two adjacent layers of air magnetic barrier layers, so that n-1 cuboid ferrites 5 are arranged on the n layers of rotor areas 1 in total, as shown in figure 1, the cuboid ferrite 5 on the rotor area 1 is magnetized along the q-axis direction, the q-axis current can be reduced, the torque density is improved, and the power factor and the efficiency are improved; and the rectangular parallelepiped ferrite 5 on the rotor area 1 and the rectangular parallelepiped ferrite 4 in the air magnetic barrier layer are vertically distributed, as shown in fig. 1, if n is 3, the vertically distributed rectangular parallelepiped ferrite 4 is E-shaped;
as shown in fig. 1, the length of the rectangular solid ferrite 4 in the air magnetic barrier layer 1 increases from the rotor axis to the outside in sequence, which not only saves cost, but also limits the magnetomotive force direction, and the length of the rectangular solid ferrite 5 on the rotor area 1 is equal;
as shown in fig. 1, n rectangular parallelepiped ferrites 3 which are equal in length and are distributed in parallel are respectively arranged in n air magnetic barrier layers 1 in 2 45-degree regions between a d1 axis and a q1 axis;
n rectangular ferrites 3 which are equal in length and are distributed in parallel are respectively arranged in n air magnetic barrier layers 1 in 2 regions of 45 degrees between the d2 axis and the q2 axis;
the layout of all the rectangular parallelepiped ferrites in a 90 DEG region (two 90 DEG regions through which the d1 axis passes in four 90 DEG regions divided by the q1 axis and the q2 axis) is formed by rectangular parallelepiped ferrites distributed vertically in a 45 DEG region between the q2 axis and the d1 axis and rectangular parallelepiped ferrites distributed in parallel alignment in a 45 DEG region between the d1 axis and the q1 axis;
as shown in fig. 1, the layout of all the rectangular parallelepiped ferrites in the 90 ° region (two 90 ° regions through which the d2 axis passes in four 90 ° regions divided by the q1 axis, the q2 axis) is constituted by rectangular parallelepiped ferrites 4 and 5 distributed vertically in the 45 ° region between the q1 axis and the d2 axis, and rectangular parallelepiped ferrites 3 distributed in parallel alignment in the 45 ° region between the d2 axis and the q2 axis;
all the above rectangular solid ferrites 3, 4, 5 and the air magnetic barrier layer 1 form an n-layer air magnetic barrier layer structure in the four rotor regions divided by the axes q1 and q 2;
in four 90-degree regions divided by q1 axes and q2 axes, four types of air magnetic barrier opening angles in four 45-degree regions of two adjacent 90-degree regions are different in size, the air magnetic barrier opening angles of each type are the same in size, and the air magnetic barrier opening angle of a 180-degree region formed by two adjacent 90-degree regions and the air magnetic barrier opening angle of another 180-degree region are in a rotational symmetry relationship. In four 90-degree areas divided by q1 and q2 axes, magnetic barrier structures in the 90-degree areas at opposite angles are completely the same, the magnetic barriers are all asymmetric structures, the asymmetric magnetic barrier structures can change magnetic conductance distribution and present an uneven characteristic, so that associated torque phases of the two areas are changed, the problem of large torque pulsation caused by the adoption of a symmetric magnetic barrier structure of a conventional permanent magnet auxiliary synchronous reluctance motor rotor is solved, and the torque pulsation of a ferrite auxiliary synchronous reluctance motor is effectively reduced.
Claims (1)
1. A rotor structure of a ferrite auxiliary synchronous reluctance motor is characterized in that a d-axis coordinate system and a q-axis coordinate system which are synchronous with a rotor are established on a motor rotor of a 4-pole ferrite auxiliary synchronous reluctance motor; the positive direction of the d axis is the direction of the magnetic field of the rotor from the N pole to the S pole, and the included angle between the q axis and the d axis is 45 degrees, so that two pairs of d and q axes formed on the rotor of the motor are respectively marked as a d1 axis, a d2 axis, a q1 axis and a q2 axis; the two pairs of d and q shafts divide the motor rotor into eight 45-degree areas around the central axis of the motor; the opening angle of the air magnetic barrier is an included angle between an air magnetic barrier layer on which the permanent magnet is embedded and an air magnetic barrier layer on which the permanent magnet is not embedded on the motor rotor; the method is characterized in that:
n rectangular parallelepiped ferrites are respectively arranged in the direction of the d1 axis in n air magnetic barrier layers in 2 45-degree regions between the d1 axis and the q2 axis;
n rectangular parallelepiped ferrites are respectively arranged in the direction of the d2 axis in n air magnetic barrier layers in 2 45-degree regions between the d2 axis and the q1 axis;
arranging n layers of rotor areas and n layers of air magnetic barrier layers at intervals, and arranging a cuboid ferrite on the rotor area between two adjacent air magnetic barrier layers, so that n-1 cuboid ferrites are arranged on the rotor area; the rectangular ferrite in the air magnetic barrier and the rectangular ferrite on the rotor area are vertically distributed;
the lengths of the long ferrites in the air magnetic barrier layer are sequentially increased from the axis of the rotor outwards, and the lengths of the cuboid ferrites on the rotor area are equal;
n rectangular ferrites which are equal in length and are distributed in parallel are respectively arranged in n air magnetic barrier layers in 2 regions of 45 degrees between the d1 axis and the q1 axis;
n rectangular ferrites which are equal in length and are distributed in parallel are respectively arranged in n air magnetic barrier layers in 2 regions of 45 degrees between the d2 axis and the q2 axis;
the rectangular solid-like ferrites distributed vertically in the 45-degree region between the q2 axis and the d1 axis and the rectangular solid-like ferrites distributed in parallel alignment in the 45-degree region between the d1 axis and the q1 axis jointly form the layout of all the rectangular solid-like ferrites in the 90-degree region;
the rectangular solid-like ferrites distributed vertically in the 45-degree region between the q1 axis and the d2 axis and the rectangular solid-like ferrites distributed in parallel alignment in the 45-degree region between the d2 axis and the q2 axis jointly form the layout of all the rectangular solid-like ferrites in the 90-degree region;
in four 90-degree regions divided by q1 axes and q2 axes, four types of air magnetic barrier opening angles in four 45-degree regions of two adjacent 90-degree regions are different in size, the air magnetic barrier opening angles of each type are the same in size, and the air magnetic barrier opening angle of a 180-degree region formed by two adjacent 90-degree regions and the air magnetic barrier opening angle of another 180-degree region are in a rotational symmetry relationship.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220758860.1U CN216929718U (en) | 2022-04-01 | 2022-04-01 | Ferrite auxiliary synchronous reluctance motor rotor structure |
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| CN202220758860.1U CN216929718U (en) | 2022-04-01 | 2022-04-01 | Ferrite auxiliary synchronous reluctance motor rotor structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024078113A1 (en) * | 2022-10-14 | 2024-04-18 | 广东美芝制冷设备有限公司 | Permanent magnet-assisted synchronous reluctance motor and compressor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024078113A1 (en) * | 2022-10-14 | 2024-04-18 | 广东美芝制冷设备有限公司 | Permanent magnet-assisted synchronous reluctance motor and compressor |
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Inventor after: Di Chong Inventor after: Sun Yanan Inventor after: Yang Zikai Inventor after: Rao Xin Inventor after: Zhang Xiang Inventor after: Yang Pengju Inventor after: Dong Yuhang Inventor before: Di Chong Inventor before: Sun Yanan Inventor before: Yang Zikai Inventor before: Rao Xin Inventor before: Zhang Xiang Inventor before: Zhang Pengju Inventor before: Dong Yuhang |