Motor rotor and motor using same

Abstract

The invention discloses a motor rotor and a motor applying the same, and relates to the technical field of motors, the motor rotor comprises an annular magnet yoke and magnetic steel, the magnetic steel is arranged on one side, close to a motor stator, of the magnet yoke, the magnet yoke comprises a plurality of magnetic pole groups, and the plurality of magnetic pole groups are arranged according to a Halbach array; the magnetic field intensity of an air gap area between the motor rotor and the motor stator is enhanced; the magnetic pole groups are used for replacing silicon steel sheets, so that an iron core part is omitted, the occupied space is reduced, the structural compactness of the rotor is improved, the magnetic induction intensity is increased, the magnetic field energy density is improved, the motor can output higher power under the same volume, and the motor is suitable for high-power-density application scenes; in addition, the magnetic pole sets are arranged in a Halbach array mode, magnetic flux is effectively concentrated, magnetic induction intensity in air gaps is improved, interference of reverse magnetic flux is reduced, the motor can utilize a magnetic field more efficiently in the operation process, output power is improved, meanwhile, loss of the motor is reduced, and therefore the overall performance and efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a motor rotor and a motor using the same. Background Art

[0002] A motor is a device that converts electrical energy into mechanical energy. It uses an energized coil to generate a rotating magnetic field and acts on the rotor to form a magneto-electrodynamic rotating torque. The demand for motors in various fields includes not only higher power density and higher efficiency, but also more compact structure, lower manufacturing cost and greater reliability.

[0003] The rotors of traditional motors generally use silicon steel sheets as the yoke material to guide the magnetic flux. However, the magnetic permeability of silicon steel sheets is limited, and magnetic saturation is prone to occur under high power density scenarios. Therefore, the silicon steel sheet yokes in the motors are often thicker, occupying a large amount of internal space of the rotor, resulting in insufficient overall compactness of the motor and limiting further improvement of power density.

[0004] Therefore, people are in urgent need of a motor rotor with small space occupation, high compactness and high output power, and a motor using the same. Summary of the invention

[0005] The purpose of the present invention is to provide a motor rotor and a motor using the same, so as to solve the problems existing in the above-mentioned prior art. By using a magnetic pole group arranged according to a Halbach array instead of silicon steel sheets as a yoke, it can reduce space occupancy, improve structural compactness and output power.

[0006] To achieve the above-mentioned purpose, the present invention provides the following solution: The present invention provides a motor rotor, comprising a magnetic yoke and a magnet, both of which are annular. The magnet is arranged on a side of the magnetic yoke close to the motor stator. The magnetic yoke comprises a plurality of magnetic pole groups, and the plurality of magnetic pole groups are arranged according to a Halbach array to enhance the magnetic field strength in the air gap area between the motor rotor and the motor stator.

[0007] Preferably, the magnetic steel includes a plurality of permanent magnet groups, and the polarities of adjacent permanent magnet groups are opposite.

[0008] Preferably, the permanent magnet group includes at least one permanent magnet, and the polarities of the plurality of permanent magnets in the same permanent magnet group are the same.

[0009] Preferably, the magnetic poles of the magnetic pole group and the permanent magnets of the permanent magnet group are arranged in a staggered manner.

[0010] Preferably, the magnetic poles of the magnetic pole group and the permanent magnets of the permanent magnet group are made of aluminum nickel cobalt, ferrite, samarium cobalt or neodymium iron boron.

[0011] Preferably, the magnetic pole group includes at least one magnetic pole, and the polarities of the plurality of magnetic poles in the same magnetic pole group are the same.

[0012] Preferably, pin holes for inserting pins are provided between adjacent magnetic poles, and the pins press the pressure plate tightly against the axial side end of the yoke.

[0013] Preferably, a groove body with a semicircular cross-section is provided on the side wall of the magnetic pole, and the groove bodies of adjacent magnetic poles are spliced ​​to form the pin hole.

[0014] The present invention also provides a motor using the above-mentioned motor rotor, including the motor rotor, an output shaft, the motor stator and a base, the motor stator is arranged in the base, the motor rotor is arranged in the motor stator, an air gap is provided between the motor rotor and the motor stator, and the motor rotor is connected to the output shaft.

[0015] Preferably, the motor stator comprises a stator core and a coil winding arranged on the stator core.

[0016] Compared with the prior art, the present invention mainly achieves the following technical effects:

[0017] The use of magnetic pole groups to replace silicon steel sheets eliminates the iron core part, and the magnetic pole groups have a thinner thickness than the iron core to guide the magnetic flux, reducing space occupancy, improving the compactness of the rotor structure, and significantly increasing the magnetic induction intensity. At the same time, the magnetic field energy density is increased, so that the motor can output higher power under the same volume, which is suitable for high power density application scenarios. After removing the iron core, the eddy current loss when there is an iron core is reduced, making the motor more efficient. In addition, the magnetic pole groups are arranged in a Halbach array. Through the rotation of the magnetic pole direction, the magnetic field is enhanced on the air gap side, while the magnetic field on the output shaft side is greatly weakened. It not only effectively concentrates the magnetic flux and increases the magnetic induction intensity in the air gap, but also reduces the interference of reverse magnetic flux. This array design enables the motor to utilize the magnetic field more efficiently during operation, increasing the output power while reducing the loss of the motor, thereby improving the overall performance and efficiency.

[0018] Compared with the prior art, other solutions of the present invention have achieved the following technical effects:

[0019] Fixing is achieved by pins and pressure plates using adjacent magnetic poles, ensuring stability and durability under high load conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a structural schematic diagram of a motor rotor matched with a motor stator in an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the structure of a Halbach array according to an embodiment of the present invention;

[0023] Among them, 1. yoke; 2. magnetic pole; 3. magnetic steel; 4. motor stator; 5. pin hole; 6. permanent magnet. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The purpose of the present invention is to provide a motor rotor and a motor using the same, so as to solve the problems existing in the prior art. By using a magnetic pole group arranged according to a Halbach array instead of silicon steel sheets as a yoke, it can reduce space occupancy, improve structural compactness and output power.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Please refer to Figure 1 , Figure 2As shown, a motor rotor is provided, including a magnetic yoke 1 and a magnetic steel 3, both of which are annular. The magnetic steel 3 is arranged on one side of the magnetic yoke 1 close to the motor stator 4. The magnetic yoke 1 includes a plurality of magnetic pole groups, which are arranged according to a Halbach array to enhance the magnetic field strength in the air gap area between the motor rotor and the motor stator 4. In the motor rotor, the magnetic pole group is used to replace the silicon steel sheet, and the iron core part is omitted. The magnetic pole group has a relatively thin thickness relative to the iron core to achieve the guidance of the magnetic flux, thereby reducing the space occupied, improving the compactness of the rotor structure, and significantly increasing the magnetic induction intensity. At the same time, the magnetic field energy density is increased, so that the motor is It can output higher power under the same volume, which is suitable for application scenarios with high power density. After removing the iron core, the eddy current loss when there is an iron core is reduced, making the motor more efficient. In addition, the magnetic pole group adopts the Halbach array arrangement. Through the rotation of the magnetic pole in the 2 directions, the magnetic field is enhanced on the air gap side, while the magnetic field on the output shaft side is greatly weakened. It not only effectively concentrates the magnetic flux and increases the magnetic induction intensity in the air gap, but also reduces the interference of reverse magnetic flux. This array design enables the motor to utilize the magnetic field more efficiently during operation, while increasing the output power and reducing the loss of the motor, thereby improving the overall performance and efficiency.

[0028] In addition, since the arrangement of the magnetic yoke 1 reduces the space occupied in the motor, with the same volume as a conventional motor, the saved space can be used to arrange heat dissipation space, place a cooling device, or be used for structural reinforcement.

[0029] The calculation formula of the magnetic field energy of the motor rotor is:

[0030]

[0031] Among them, B is the magnetic induction intensity, H is the magnetic field intensity, and V is the motor volume.

[0032] This integral represents the magnetic field energy in the entire magnetic circuit. Increasing the magnetic induction intensity B and the magnetic field intensity H, or increasing the volume V, can increase the electromagnetic energy storage of the motor, thereby improving the motor power. The magnetic pole 2 in this embodiment can provide higher magnetic induction intensity B and magnetic field intensity H, thereby improving the electromagnetic energy storage of the motor.

[0033] The magnetic steel 3 includes a plurality of permanent magnet groups, and the polarities of adjacent permanent magnet groups are opposite to each other, so as to form a magnetic field on the motor rotor that matches the motor stator 4 .

[0034] The permanent magnet group includes at least one permanent magnet 6. When the permanent magnet group includes multiple permanent magnets 6, the multiple permanent magnets 6 in the same permanent magnet group have the same polarity, ensuring that the permanent magnet group has a stable polarity direction.

[0035] The magnetic pole 2 of the magnetic pole group and the permanent magnet 6 of the permanent magnet group are staggered. The reasons for staggering the magnetic pole 2 of the magnetic pole group and the permanent magnet 6 of the permanent magnet group are usually related to reducing eddy current loss, improving the uniformity of the magnetic field, avoiding magnetic saturation and improving the efficiency and performance of the system, including the following points: First, reducing eddy current loss: the staggered arrangement of the magnetic pole 2 and the permanent magnet 6 can help reduce eddy current loss in the motor or generator. Eddy current loss usually occurs in conductive materials. When the magnetic field changes rapidly, unnecessary current will be generated in the conductor. The staggered arrangement can make the change of the magnetic field smoother and reduce such eddy current loss. Second, avoiding magnetic saturation: the magnetic field of the permanent magnet 6 has a certain saturation point. If the magnetic pole 2 and the permanent magnet 6 have a certain saturation point, the eddy current loss will be reduced. Completely centralized alignment of permanent magnets 6 may cause the magnetic field strength in certain areas to reach saturation, thereby reducing the efficiency and performance of the system. The staggered design can avoid local magnetic saturation, maintain uniform distribution of the magnetic field, and improve work efficiency. Third, improving the air gap magnetic field: in the motor, the staggered design of poles 2 and permanent magnets 6 can effectively improve the distribution of the air gap magnetic field, avoid energy loss and system vibration caused by uneven magnetic flux density, and thus improve the stability and operating efficiency of the system. In summary, the purpose of the staggered design of poles 2 and permanent magnets 6 is to optimize the distribution of the magnetic field, reduce losses, and improve efficiency and stability, so as to ensure that motors, generators and other equipment can still operate efficiently and stably under extreme conditions.

[0036] The materials of the magnetic poles 2 of the magnetic pole group and the permanent magnets 6 of the permanent magnet group are AlNiCo, ferrite, SmCo or NdFeB.

[0037] The magnetic pole group includes at least one magnetic pole 2, which is a permanent magnet. When the magnetic pole group includes multiple magnetic poles 2, the polarities of the multiple magnetic poles 2 in the same magnetic pole group are the same, ensuring that the permanent magnet group has a stable polarity direction.

[0038] In order to fix the adjacent magnetic poles 2 and prevent the magnetic poles 2 from loosening or falling off after being subjected to centrifugal force and mechanical load when the motor is running, a pin hole 5 for inserting a pin is provided between the adjacent magnetic poles 2. The wall of the pin hole 5 is divided into two parts and is respectively located on the magnetic poles 2 on both sides. The pin matching the pin hole 5 presses the pressure plate tightly against the axial side end of the yoke 1, and the function of the pressure plate is to provide lateral support. When the pin is inserted into the pin hole 5, the magnetic poles 2 on both sides will be fixed. After all the magnetic poles 2 are connected to the pin, the magnetic poles 2 of the overall yoke 1 are locked to ensure stability and durability under high load conditions. The pin is preferably a stainless steel pin to improve the service life.

[0039] Both ends of the pin extend out of the yoke 1, and both ends of the pin have a pressure plate, which is slidably set on the pin, and a detachable clamp is set at the part of the pin end corresponding to the outer side of the pressure plate to prevent the pressure plate from axially dislodging and squeeze the pressure plate. The clamp can be a threaded nut or a U-shaped card with a support arm radially inserted into the pin. The specific structure of the U-shaped card is: the U-shaped card is made of elastic steel, and a through hole is radially opened on the pin. The opening length of the U-shaped card is less than the maximum distance between the through hole and the outer peripheral wall of the pin, that is, when one arm of the U-shaped card is inserted into the through hole, it needs to be forced to open, and then self-close after being inserted into the through hole, so as to form a lock and prevent the U-shaped card from dislodging.

[0040] In this embodiment, a slot body with a semicircular cross section is provided on the side wall of the magnetic pole 2, and the slot bodies of adjacent magnetic poles 2 are spliced ​​to form a pin hole 5, so that the sizes of the slot bodies on different magnetic poles 2 are unified for easy processing.

[0041] The present invention also provides a motor using the above motor rotor, including a motor rotor, an output shaft, a motor stator 4 and a base, wherein the motor stator 4 is arranged in the base, the motor rotor is arranged in the motor stator 4, an air gap is provided between the motor rotor and the motor stator 4, and the motor rotor is connected to the output shaft.

[0042] The motor stator 4 includes a stator core and a coil winding arranged on the stator core. A slot is provided on the inner peripheral wall of the stator core for winding the coil winding. The stator core adopts a silicon steel sheet lamination design.

[0043] Adaptive changes made according to actual needs are all within the protection scope of the present invention.

[0044] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numerals in the claims should not be regarded as limiting the claims involved.

[0045] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A motor rotor, characterized in that: It includes a magnetic yoke and a magnetic steel, both of which are annular. The magnetic steel is arranged on a side of the magnetic yoke close to the motor stator. The magnetic yoke includes a plurality of magnetic pole groups, which are arranged according to a Halbach array to enhance the magnetic field strength in the air gap area between the motor rotor and the motor stator.

2. The motor rotor according to claim 1, characterized in that: The magnetic steel includes a plurality of permanent magnet groups, and the polarities of adjacent permanent magnet groups are opposite.

3. The motor rotor according to claim 2, characterized in that: The permanent magnet group includes at least one permanent magnet, and the polarities of the plurality of permanent magnets in the same permanent magnet group are the same.

4. The motor rotor according to claim 2, characterized in that: The magnetic poles of the magnetic pole group and the permanent magnets of the permanent magnet group are arranged in a staggered manner.

5. The motor rotor according to claim 2, characterized in that: The materials of the magnetic poles of the magnetic pole group and the permanent magnets of the permanent magnet group are AlNiCo, ferrite, SmCo or NdFeB.

6. The motor rotor according to claim 1, characterized in that: The magnetic pole group includes at least one magnetic pole, and the polarities of the plurality of magnetic poles in the same magnetic pole group are the same.

7. The motor rotor according to claim 6, characterized in that: Pin holes for inserting pins are arranged between adjacent magnetic poles, and the pins press the pressure plate tightly against the axial side end of the yoke.

8. The motor rotor according to claim 7, characterized in that: A slot body with a semicircular cross section is arranged on the side wall of the magnetic pole, and the slot bodies of adjacent magnetic poles are spliced ​​to form the pin hole.

9. A motor, characterized in that: The motor rotor as described in any one of claims 1 to 8 comprises the motor rotor, an output shaft, the motor stator and a base, the motor stator is arranged in the base, the motor rotor is arranged in the motor stator, an air gap is formed between the motor rotor and the motor stator, and the motor rotor is connected to the output shaft.

10. The motor according to claim 9, characterized in that The motor stator comprises a stator core and a coil winding arranged on the stator core.

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