CN114362398A - Permanent magnet motor rotor and manufacturing method thereof - Google Patents
Permanent magnet motor rotor and manufacturing method thereof Download PDFInfo
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- CN114362398A CN114362398A CN202111334448.3A CN202111334448A CN114362398A CN 114362398 A CN114362398 A CN 114362398A CN 202111334448 A CN202111334448 A CN 202111334448A CN 114362398 A CN114362398 A CN 114362398A
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Abstract
The invention discloses a permanent magnet motor rotor and a manufacturing method thereof, which relate to the field of high-speed permanent magnet motors and comprise a permanent magnet, a non-magnetic-conductive material filling body, a carbon fiber sheath, a rotor shaft sleeve, a stress buffer ring, a rotor front end ring and a rotor rear end ring, wherein the rotor shaft sleeve is provided with the stress buffer ring; the stress buffering ring is assembled between the permanent magnet and the rotor shaft sleeve, and the contact surface of the permanent magnet during pasting can be effectively increased by utilizing the characteristic of stronger plasticity of the stress buffering ring, so that the stability of pasting and fixing of the permanent magnet is improved.
Description
Technical Field
The invention relates to the field of high-speed permanent magnet motors, in particular to a permanent magnet motor rotor and a manufacturing method thereof.
Background
In the application field of high-speed permanent magnet motors, when the linear velocity of the surface of a rotor exceeds a certain value, the rotor of the high-speed permanent magnet motor generally adopts a block type surface-mounted structure, the traditional surface-mounted structure is that a permanent magnet is directly bonded on a rotor shaft sleeve, and meanwhile, in order to prevent the permanent magnet from loosening or falling off due to centrifugal force during high-speed operation, a non-magnetic metal thin-wall sheath is added outside the permanent magnet for interference fit, or the permanent magnet is fixed in a manner of being bound by a non-magnetic metal wire, a carbon fiber tape and a glass fiber tape;
however, the above method has the following disadvantages: 1. because of the processing technology of the permanent magnet or the rotor shaft sleeve, the permanent magnet is directly bonded on the rotor shaft sleeve, and the contact surface of the permanent magnet and the rotor shaft sleeve has more or less gaps, so that the reliability of permanent magnet bonding and fixing is reduced, and meanwhile, the heat dissipation efficiency of the permanent magnet in the direction of the rotating shaft is insufficient, and the service life of the magnetic steel is influenced; 2. the permanent magnet in the permanent magnet motor rotor is made of magnetic materials which are brittle, the rotor shaft sleeve is made of 40Cr alloy steel generally and is hard and not easy to deform, the outer layer sheath of the rotor or the binding belt for fixing the permanent magnet are in interference fit, and the permanent magnet is subjected to large compressive stress, so that the adhesion surface of the permanent magnet is damaged or defective, and the quality of the motor is affected; 3. when the motor runs at a high speed, the permanent magnet of the motor rotor can generate large eddy current loss, the loss can be converted into heat to improve the temperature of the motor rotor, and the heat conducting capacity of the carbon fiber sheath is poor, so that the heat dissipation effect of the magnetic steel through an air gap between the magnetic steel and the stator is poor, and the high-temperature magnetic loss of the permanent magnet is easily caused; 4. when the thermal state runs at a high speed, the annular thermal expansion coefficient of the carbon fiber composite material sheath on the surface of the rotor is very small, thermal expansion hardly occurs at high temperature, and the expansion amount of other components is large, so that the magnitude of interference on a contact surface is greatly increased, the annular tensile stress of the sheath is greatly increased, the radial compressive stress of the sheath is more severe at the joint of a permanent magnet and a magnetic pole, the bending stress is sharply increased, and the safety of the rotor is seriously threatened. Therefore, the invention provides a permanent magnet motor rotor and a manufacturing method thereof, which aim to overcome the defects in the prior art.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a permanent magnet motor rotor and a method for manufacturing the same, in which a stress buffering ring is assembled between a permanent magnet and a rotor shaft sleeve, and the strong plasticity of the stress buffering ring is utilized to effectively increase the contact surface when the permanent magnet is bonded and improve the stability of the bonding and fixing of the permanent magnet.
In order to achieve the purpose, the invention provides the following technical scheme:
a permanent magnet motor rotor comprises a permanent magnet, a non-magnetic material filler, a carbon fiber sheath, a rotor shaft sleeve, a stress buffering ring, a rotor front end ring and a rotor rear end ring, wherein the rotor shaft sleeve is provided with the stress buffering ring;
the stress buffering ring comprises an outer ring, a middle ring, an inner ring, outer ring buffering teeth and inner ring buffering teeth, wherein the middle ring is arranged on the inner side of the outer ring, the inner ring is arranged on the inner side of the middle ring, the outer ring is provided with the outer ring buffering teeth, and the inner ring is provided with the inner ring buffering teeth.
The further improvement lies in that: the outer ring buffer teeth are arranged on the outer ring in an annular array and face the outer side wall direction of the middle ring.
The further improvement lies in that: the inner ring buffering teeth are arranged on the inner ring in an annular array and face the direction of the inner side wall of the middle ring.
The further improvement lies in that: and buffer tooth gaps are formed between the outer ring buffer teeth and the outer side of the middle ring and between the inner ring buffer teeth and the inner side of the middle ring.
A method for manufacturing a rotor of a permanent magnet motor comprises the following steps:
the method comprises the following steps: arranging a stress buffer ring to be composed of an outer ring, a middle ring and an inner ring, arranging outer ring buffer teeth and inner ring buffer teeth on the outer ring and the inner ring respectively, assembling the stress buffer ring on a rotor shaft sleeve, and controlling the stress buffer ring and the rotor shaft sleeve to be in interference assembly;
step two: sleeving a rotor front end ring on the stress buffer ring in a hot sleeving manner, adhering a permanent magnet to the surface of the stress buffer ring, and sleeving a rotor rear end ring on one end of the permanent magnet, which is far away from the rotor front end ring, in a hot sleeving manner after the permanent magnet is adhered;
step three: assembling the non-magnetic material filler and the permanent magnet to form a complete cylindrical surface, then performing interference assembly on the carbon fiber sheath and the permanent magnet to fasten the permanent magnet, and performing interference fit assembly between the permanent magnet and the stress buffer ring;
step four: the interference fit between the permanent magnet and the stress buffer ring is marked delta1The interference between the stress damping ring and the rotor sleeve is marked delta2，δ1And delta2Satisfies the following equation set (1.1);
the further improvement lies in that: the first step also comprises setting the thickness ratio of the inner ring, the middle ring and the outer ring, firstly marking the thickness of the inner ring as H3The thickness of the middle ring is marked as H2The thickness of the outer ring is marked H1The thickness ratio of the inner ring, the middle ring and the outer ring satisfies the public expression (1.2):
H3≤H1<H2 (1.2)。
the further improvement lies in that: in the first step, when the outer ring buffer teeth and the inner ring buffer teeth are respectively arranged on the outer ring and the inner ring, the height of the gap between the buffer teeth is determined, and the height of the gap between the buffer teeth is marked as H4Height H of buffer tooth gap4Satisfy the requirement ofPublication (1.3):
the further improvement lies in that: in the first step, when the outer ring buffer teeth and the inner ring buffer teeth are respectively arranged on the outer ring and the inner ring, the method further comprises the step of determining the female tooth radius and the male tooth radius of the outer ring buffer teeth and the inner ring buffer teeth, and firstly, the female tooth radius of the outer ring buffer teeth and the female tooth radius of the inner ring buffer teeth are marked as the radius R6The male tooth radius of the outer ring buffer tooth and the inner ring buffer tooth is marked as the diameter R7Radius of female tooth R6Radius R of male tooth7Satisfies the publication (1.4):
R6≥R7 (1.4)。
the further improvement lies in that: in the equation set (1.1) in the fourth step, ur_PM、ur_buffer、ur_sleeveAnd ur_shaftRespectively permanent magnet radial displacement, stress buffer ring radial displacement, carbon fiber sheath radial displacement and rotor shaft sleeve radial displacement; r2、R3And R4The inner diameter of the carbon fiber sheath, the outer diameter of the stress buffer ring and the outer diameter of the rotor shaft sleeve are respectively.
The further improvement lies in that: for the permanent magnet, the stress buffer ring and the carbon fiber sheath, the stress and the strain of the contact surface of the permanent magnet, the stress buffer ring and the carbon fiber sheath satisfy the equation (1.5):
wherein σr、σθRadial and hoop stresses of the permanent magnet 1, respectively; r is the radius of the inner surface of the permanent magnet; epsilonr、εθRespectively radial strain and circumferential strain of the permanent magnet; er、EθRespectively radial and circumferential elastic moduli; v. ofθr、vrθRespectively is an annular radial poisson coefficient and a radial annular poisson coefficient; u. ofrIs a radial displacement.
The invention has the beneficial effects that: according to the rotor structure, the stress buffering ring is assembled between the permanent magnet and the rotor shaft sleeve, and the strong plasticity of the stress buffering ring is utilized, so that the contact surface of the permanent magnet during pasting can be effectively increased, the stability of pasting and fixing of the permanent magnet is improved, meanwhile, the stress distribution of the pasting surface of the permanent magnet can be improved, and the permanent magnet damage caused by uneven stress of the pasting surface of the permanent magnet during binding of the carbon fiber sheath and high-speed operation is avoided;
the rotor structure can improve the efficiency of heat dissipation of the permanent magnet to the direction of the rotor shaft sleeve, reduce the temperature of the permanent magnet in the high-speed operation process and further improve the performance and reliability of the motor;
according to the invention, the stress buffer ring is provided with the outer ring buffer teeth and the inner ring buffer teeth, when the device runs at a high speed in a hot state, the outer ring buffer teeth and the inner ring buffer teeth can effectively offset the expansion amount of other components, the bending stress of the carbon fiber sheath at the interval joint of the permanent magnet and the magnetic pole is reduced, and the effectiveness of the carbon fiber maintenance sleeve when the device runs at a high speed in a hot state is ensured; meanwhile, the rotor structure of the invention has high strength, stable thermal state high-speed performance, simple process of the assembled stress buffer ring structure, lower processing cost and easy installation.
Drawings
FIG. 1 is a schematic cross-sectional view of the structure of the present invention;
FIG. 2 is an exploded view of the structure of the present invention;
FIG. 3 is a schematic view of a stress buffer ring structure according to the present invention;
FIG. 4 is an enlarged view of the structure at A in FIG. 3 according to the present invention;
FIG. 5 is an enlarged view of the structure at B in FIG. 4 according to the present invention.
Detailed Description
In order to enhance the understanding of the present invention, the present invention will be further described with reference to the following examples, which are only for the purpose of illustration and are not to be construed as limiting the scope of the present invention.
According to fig. 1-5, the present embodiment provides a permanent magnet motor rotor, which includes a permanent magnet 1, a non-magnetic conductive material filler 2, a carbon fiber sheath 3, a rotor shaft sleeve 4, a stress buffering ring 5, a rotor front end ring 6 and a rotor rear end ring 7, wherein the rotor shaft sleeve 4 is provided with one end of the stress buffering ring 5, the rotor front end ring 6 is sleeved on the stress buffering ring 5, the permanent magnet 1 is provided outside the stress buffering ring 5, one end of the stress buffering ring 5 away from the rotor front end ring 6 is sleeved on the rotor rear end ring 7, the non-magnetic conductive material filler 2 is provided on the permanent magnet 1, and the carbon fiber sheath 3 is provided outside the non-magnetic conductive material filler 2;
the stress buffering ring 5 comprises an outer ring 51, a middle ring 52, an inner ring 53, outer ring buffering teeth 54 and inner ring buffering teeth 55, the middle ring 52 is arranged on the inner side of the outer ring 51, the inner ring 53 is arranged on the inner side of the middle ring 52, the outer ring 51 is provided with the outer ring buffering teeth 54, and the inner ring 53 is provided with the inner ring buffering teeth 55. in the implementation of the invention, the outer ring 51 and the inner ring 53 are made of alloy materials with relatively low rigidity, strong plasticity and relatively high thermal conductivity, because the permanent magnet 1 is adhered on the outer ring 51, the outer ring is made of alloy materials with relatively low rigidity, strong plasticity and relatively high thermal conductivity, when the outer ring 51 and the permanent magnet 1 are assembled in an interference manner, the adhering contact surface of the permanent magnet 1 can be effectively increased, the heat conversion efficiency of the permanent magnet 1 and the carbon fiber sheath 3 is improved, and the timely heat dissipation of the permanent magnet 1 is ensured when the rotor runs at high speed, the permanent magnet is prevented from high-temperature demagnetization; the middle ring 52 is made of an alloy material with high rigidity and low plasticity, so that the effect of ensuring the structural strength of the stress buffering ring 5 can be achieved, and in the embodiment of the invention, the inner ring 53 can be fully contacted with the cylindrical surface of the rotor shaft sleeve 4, so that the inner ring not only can improve the heat dissipation efficiency of the permanent magnet 1 towards the rotor shaft sleeve 4 and reduce the temperature of the permanent magnet in the high-speed operation process, but also can improve the stability of assembling and fixing the rotor shaft sleeve 4 and the stress buffering ring 5, and further improve the performance and the reliability of the motor;
the outer ring buffer teeth 54 are provided with a plurality of groups in an annular array on the outer ring 51, and the plurality of groups of outer ring buffer teeth 54 all face the outer side wall direction of the middle ring 52.
The inner ring buffer teeth 55 are arranged on the inner ring 53 in a plurality of groups in an annular array, and the plurality of groups of inner ring buffer teeth 55 face the inner side wall direction of the middle ring 52.
A method for manufacturing a rotor of a permanent magnet motor comprises the following steps:
the method comprises the following steps: arranging a stress buffering ring 5 to be composed of an outer ring 51, a middle ring 52 and an inner ring 53, arranging outer ring buffering teeth 54 and inner ring buffering teeth 55 on the outer ring 51 and the inner ring 53 respectively, then assembling the stress buffering ring 5 on the rotor shaft sleeve 4, and controlling the stress buffering ring 5 and the rotor shaft sleeve 4 to be in interference fit;
the ratio of the thicknesses of the inner ring 53, the middle ring 52 and the outer ring 51 is then set, and the thickness of the inner ring 53 is first marked as H3The thickness of the middle ring 52 is marked as H2The thickness of the outer ring 51 is denoted by H1The thickness ratio of the inner ring 53, the middle ring 52, and the outer ring 51 satisfies the expression (1.2):
H3≤H1<H2 (1.2)；
when the outer ring 51 and the inner ring 53 are provided with the outer ring buffer teeth 54 and the inner ring buffer teeth 55, respectively, the height of the buffer tooth gap 56 is determined, and the height of the buffer tooth gap 56 is marked as H4Height H of buffer tooth gap 564Satisfies the publication (1.3):
when the outer ring 51 and the inner ring 53 are respectively provided with the outer ring buffer teeth 54 and the inner ring buffer teeth 55, the method further comprises the step of determining the female tooth radius and the male tooth radius of the outer ring buffer teeth 54 and the inner ring buffer teeth 55, and firstly, the female tooth radius of the outer ring buffer teeth 54 and the inner ring buffer teeth 55 is marked as the radius R6The male tooth radii of the outer ring buffer teeth 54 and the inner ring buffer teeth 55 are designated as the radius R7Radius of female tooth R6Radius R of male tooth7Satisfies the publication (1.4):
R6≥R7 (1.4)
step two: sleeving a front end ring 6 of the rotor on a stress buffer ring 5 in a hot-sleeving manner, adhering a permanent magnet 1 to the surface of the stress buffer ring 5, and sleeving a rear end ring 7 of the rotor on one end, far away from the front end ring 6, of the permanent magnet 1 after the permanent magnet 1 is adhered;
step three: assembling the non-magnetic material-permeable filler 2 and the permanent magnet 1 to form a complete cylindrical surface, then performing interference assembly on the carbon fiber sheath 3 and the permanent magnet 1 to fasten the permanent magnet 1, and performing interference fit assembly between the permanent magnet 1 and the stress buffer ring 5;
step four: the interference fit between the permanent magnet 1 and the stress buffer ring 5 is marked delta1The interference between the stress-damping ring 5 and the rotor bushing 4 is denoted delta2，δ1And delta2Satisfies the following equation set (1.1);
in the equation set (1.1), ur_PM、ur_buffer、ur_sleeveAnd ur_shaftThe radial displacement of the permanent magnet 1, the radial displacement of the stress buffer ring 5, the radial displacement of the carbon fiber sheath 3 and the radial displacement of the rotor shaft sleeve 4 are respectively adopted; r2、R3And R4The inner diameter of the carbon fiber sheath 3, the outer diameter of the stress buffer ring 5 and the outer diameter of the rotor shaft sleeve 4 are respectively;
for the permanent magnet 1, the stress buffer ring 5 and the carbon fiber sheath 3, the stress and strain of the contact surface thereof satisfy the equation (1.5):
wherein σr、σθRadial and hoop stresses of the permanent magnet 1, respectively; r is the radius of the inner surface of the permanent magnet 1; epsilonr、εθAre respectively asRadial and circumferential strain of the permanent magnet 1; er、EθRespectively radial and circumferential elastic moduli; v. ofθr、vrθRespectively is an annular radial poisson coefficient and a radial annular poisson coefficient; u. ofrIs a radial displacement.
According to the rotor structure, the stress buffering ring 5 is assembled between the permanent magnet 1 and the rotor shaft sleeve 4, and the strong plasticity of the stress buffering ring 5 is utilized, so that the contact surface of the permanent magnet 1 during pasting can be effectively increased, the pasting and fixing stability of the permanent magnet 1 is improved, meanwhile, the stress distribution of the pasting surface of the permanent magnet 1 can be improved by the stress buffering ring 5, and the permanent magnet 1 is prevented from being damaged due to uneven stress on the pasting surface of the permanent magnet 1 when the carbon fiber sheath 3 is bound and in the high-speed operation process;
the rotor structure can improve the heat dissipation efficiency of the permanent magnet 1 to the rotor shaft sleeve 4, reduce the temperature of the permanent magnet 1 in the high-speed operation process and further improve the performance and reliability of the motor;
according to the invention, the stress buffering ring 5 is provided with the outer ring buffering teeth 54 and the inner ring buffering teeth 55, when the carbon fiber maintenance sleeve runs at a high speed in a hot state, the outer ring buffering teeth 54 and the inner ring buffering teeth 55 can effectively counteract the expansion amount of other components, so that the bending stress of the carbon fiber sheath 3 at the joint of the permanent magnet 1 and the magnetic pole at intervals is reduced, and the effectiveness of the carbon fiber maintenance sleeve 3 in the high-speed running in the hot state is ensured; meanwhile, the rotor structure of the invention has high strength, stable thermal state high-speed performance, simple process of the assembled stress buffer ring structure, lower processing cost and easy installation.
The foregoing illustrates and describes the principles, general features, and advantages of the present 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 (10)
1. A permanent magnet motor rotor characterized in that: the permanent magnet motor rotor comprises a permanent magnet (1), a non-magnetic material-conducting stuffing body (2), a carbon fiber sheath (3), a rotor shaft sleeve (4), a stress buffering ring (5), a rotor front end ring (6) and a rotor rear end ring (7), wherein the stress buffering ring (5) is assembled on the rotor shaft sleeve (4), the rotor front end ring (6) is sleeved at one end of the stress buffering ring (5), the permanent magnet (1) is arranged on the outer side of the stress buffering ring (5), the rotor rear end ring (7) is sleeved on one end, far away from the rotor front end ring (6), of the permanent stress buffering ring (5), the non-magnetic material-conducting stuffing body (2) is arranged on the permanent magnet (1), and the carbon fiber sheath (3) is arranged on the outer side of the non-magnetic material-conducting stuffing body (2);
the stress buffering ring (5) comprises an outer ring (51), a middle ring (52), an inner ring (53), outer ring buffering teeth (54) and inner ring buffering teeth (55), the middle ring (52) is arranged on the inner side of the outer ring (51), the inner ring (53) is arranged on the inner side of the middle ring (52), the outer ring buffering teeth (54) are arranged on the outer ring (51), and the inner ring buffering teeth (55) are arranged on the inner ring (53).
2. A permanent magnet machine rotor according to claim 1, characterized in that: the outer ring buffer teeth (54) are arranged on the outer ring (51) in a ring array and are multiple groups, and the multiple groups of the outer ring buffer teeth (54) face the outer side wall direction of the middle ring (52).
3. A permanent magnet machine rotor according to claim 2, characterized in that: the inner ring buffer teeth (55) are arranged on the inner ring (53) in an annular array, and the inner ring buffer teeth (55) face the inner side wall direction of the middle ring (52).
4. A permanent magnet machine rotor according to claim 1, characterized in that: buffer tooth gaps (56) are formed between the outer ring buffer teeth (54) and the outer side of the middle ring (52) and between the inner ring buffer teeth (55) and the inner side of the middle ring (52).
5. A manufacturing method of a permanent magnet motor rotor is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: arranging a stress buffering ring (5) to be composed of an outer ring (51), a middle ring (52) and an inner ring (53), arranging outer ring buffering teeth (54) and inner ring buffering teeth (55) on the outer ring (51) and the inner ring (53) respectively, then assembling the stress buffering ring (5) on the rotor shaft sleeve (4), and controlling the stress buffering ring (5) and the rotor shaft sleeve (4) to be in interference assembly;
step two: sleeving a front end ring (6) of the rotor on a stress buffer ring (5) in a hot-sleeving manner, adhering a permanent magnet (1) to the surface of the stress buffer ring (5), and sleeving a rear end ring (7) of the rotor on one end, away from the front end ring (6), of the permanent magnet (1) after the permanent magnet (1) is adhered;
step three: assembling the non-magnetic material-permeable filler (2) and the permanent magnet (1) to form a complete cylindrical surface, then performing interference assembly on the carbon fiber sheath (3) and the permanent magnet (1) to fasten the permanent magnet (1), and performing interference fit assembly between the permanent magnet (1) and the stress buffer ring (5);
step four: the interference fit between the permanent magnet (1) and the stress buffer ring (5) is marked delta1The interference between the stress buffer ring (5) and the rotor shaft sleeve (4) is marked as delta2，δ1And delta2Satisfies the following equation set (1.1);
6. the method of claim 5, wherein: the first step also comprises the step of setting the thickness ratio of the inner ring (53), the middle ring (52) and the outer ring (51), and firstly, the thickness of the inner ring (53) is marked as H3The thickness of the middle ring (52) is marked as H2The thickness of the outer ring (51) is denoted by H1The thickness ratio of the inner ring (53), the middle ring (52) and the outer ring (51) meets the public expression (1.2):
H3≤H1<H2 (1.2)。
7. the method of claim 6, wherein:
in the first step, when the outer ring (51) and the inner ring (53) are respectively provided with the outer ring buffer teeth (54) and the inner ring buffer teeth (55), the height of the buffer tooth gap (56) is determined, and the height of the buffer tooth gap (56) is marked as H4Height H of buffer tooth gap 564Satisfies the publication (1.3):
8. the method of claim 5, wherein: in the first step, when the outer ring (51) and the inner ring (53) are respectively provided with the outer ring buffer teeth (54) and the inner ring buffer teeth (55), the method further comprises the step of determining the female tooth radius and the male tooth radius of the outer ring buffer teeth (54) and the inner ring buffer teeth (55), and firstly, the female tooth radius of the outer ring buffer teeth (54) and the female tooth radius of the inner ring buffer teeth (55) are marked as the radius R6The male tooth radius of the outer ring buffer tooth (54) and the inner ring buffer tooth (55) is marked as a diameter R7Radius of female tooth R6Radius R of male tooth7Satisfies the publication (1.4):
R6≥R7 (1.4)。
9. the method of manufacturing a permanent magnet motor rotor according to claim 1, wherein: in the equation set (1.1) in the fourth step, ur_PM、ur_buffer、ur_sleeveAnd ur_shaftThe radial displacement of the permanent magnet (1), the radial displacement of the stress buffer ring (5), the radial displacement of the carbon fiber sheath (3) and the radial displacement of the rotor shaft sleeve (4) are respectively adopted; r2、R3And R4The inner diameter of the carbon fiber sheath (3), the outer diameter of the stress buffer ring (5) and the outer diameter of the rotor shaft sleeve (4) are respectively.
10. The method of claim 8, wherein: for the permanent magnet (1), the stress buffer ring (5) and the carbon fiber sheath (3), the stress and the strain of the contact surface satisfy the equation (1.5):
wherein σr、σθRadial and hoop stresses of the permanent magnet (1) respectively; r is the radius of the inner surface of the permanent magnet (1); epsilonr、εθRespectively the radial and circumferential strain of the permanent magnet (1); er、EθRespectively radial and circumferential elastic moduli; v. ofθr、vrθRespectively is an annular radial poisson coefficient and a radial annular poisson coefficient; u. ofrIs a radial displacement.
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| CN110048575A (en) * | 2019-05-17 | 2019-07-23 | 陈益广 | A kind of composite construction p-m rotor suitable for high-speed permanent magnetic synchronous motor |
| CN111654130A (en) * | 2020-04-22 | 2020-09-11 | 天津大学 | Composite rotor structure of energy storage flywheel high-speed permanent magnet synchronous motor |
| CN113381541A (en) * | 2021-06-28 | 2021-09-10 | 珠海格力电器股份有限公司 | Rotor assembly and motor |
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