WO2024083076A1 - Moteur à aimant permanent, compresseur et dispositif de réfrigération - Google Patents

Moteur à aimant permanent, compresseur et dispositif de réfrigération Download PDF

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Publication number
WO2024083076A1
WO2024083076A1 PCT/CN2023/124743 CN2023124743W WO2024083076A1 WO 2024083076 A1 WO2024083076 A1 WO 2024083076A1 CN 2023124743 W CN2023124743 W CN 2023124743W WO 2024083076 A1 WO2024083076 A1 WO 2024083076A1
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WO
WIPO (PCT)
Prior art keywords
permanent magnet
motor
stator
rotor
core
Prior art date
Application number
PCT/CN2023/124743
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English (en)
Chinese (zh)
Inventor
杨勤
盖蕊
郭谨博
姚俊
Original Assignee
广东美芝制冷设备有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN202211296971.6A external-priority patent/CN117917842A/zh
Priority claimed from CN202222818962.0U external-priority patent/CN218387003U/zh
Application filed by 广东美芝制冷设备有限公司 filed Critical 广东美芝制冷设备有限公司
Publication of WO2024083076A1 publication Critical patent/WO2024083076A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/02—Details of the magnetic circuit characterised by the magnetic material
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]

Definitions

  • the present application belongs to the technical field of compressors, and specifically relates to a permanent magnet motor, a compressor and a refrigeration device.
  • variable-frequency motors have become the mainstream technology.
  • the permanent magnets of variable-frequency motors are mostly NdFeB permanent magnets containing heavy rare earth elements and high coercivity.
  • NdFeB permanent magnets are permanent magnet materials based on the intermetallic compound Nd2Fe14B , and the main components are neodymium, iron and boron.
  • other rare earth metals such as dysprosium and praseodymium can be used to replace part of the neodymium in the permanent magnet.
  • the consumption of heavy rare earth elements especially dysprosium and terbium
  • new technologies need to be developed.
  • cerium Compared with praseodymium and neodymium, cerium has obvious cost advantages, but compared with the same praseodymium and neodymium, the remanence of the corresponding rare earth magnet Br will be reduced, which directly affects the performance of the motor. Therefore, in order to meet the application requirements of motor performance in the whole machine, it is necessary to improve the motor structure according to the content of rare earth element cerium in the permanent magnet.
  • the present application aims to at least partially solve one of the above technical problems existing in the prior art. To this end, the present application provides a permanent magnet motor, a compressor including the permanent magnet motor, and a refrigeration device including the compressor.
  • the permanent magnet motor provided according to the first aspect of the present application includes:
  • a motor rotor comprising a rotor core and a plurality of permanent magnets disposed on the rotor core, wherein the number of poles of the motor rotor is 2P ⁇ 8, the total width of each pole magnet is b m , the permanent magnet contains a cerium element of x mass percent, and the relationship between b m satisfies: b m ⁇ 2200/(150-x); and
  • the motor stator comprises a stator core and a stator winding wound on the stator core, wherein the stator core is arranged around the outer side of the rotor core, and the stator core is provided with Q stator teeth along the inner circumference, and the tooth width of the stator teeth is b t , and the relationship satisfies: Q ⁇ b t /(P ⁇ b m ) ⁇ 1.36-x/100 ⁇ 5 ⁇ Q ⁇ b t /(4 ⁇ P ⁇ b m ).
  • the total width b m of each pole magnet satisfies: 15 mm ⁇ b m ⁇ 21 mm.
  • the mass percentage x% of the cerium element in the permanent magnet satisfies: 3% ⁇ x% ⁇ 10%.
  • the number Q of stator teeth satisfies: Q ⁇ 12.
  • the tooth width b t of the stator teeth satisfies: 5 mm ⁇ b t ⁇ 9 mm.
  • the permanent magnet contains dysprosium element, and the content of the dysprosium element is less than 3wt%.
  • the permanent magnet contains dysprosium element, and the content of the dysprosium element is less than 2.3 wt %.
  • the permanent magnet contains dysprosium element, and the content of dysprosium element is about 2.25wt%.
  • the permanent magnet contains praseodymium and neodymium elements, and the sum of the contents of the praseodymium and neodymium elements is 20wt% to 32wt%.
  • the permanent magnet contains praseodymium and neodymium elements, and the sum of the contents of the praseodymium and neodymium elements is 25wt% to 32wt%.
  • the permanent magnet contains praseodymium and neodymium elements, and the sum of the praseodymium and neodymium elements is 25wt%.
  • the permanent magnet contains cobalt element, and the content of the cobalt element is 1wt% to 2wt%.
  • a plurality of slots are provided on the end surface of the rotor core along the circumferential direction of the rotor core, and each of the permanent magnets is correspondingly embedded in each of the slots.
  • the slot is V-shaped.
  • the V-shaped opening faces the motor stator.
  • stator windings distributed on different stator teeth are connected in series or in parallel.
  • a permanent magnet motor comprising:
  • a motor rotor comprising a rotor core and a plurality of permanent magnets disposed on the rotor core, wherein the number of poles of the motor rotor is 2P ⁇ 8, the total width of each pole magnet is b m , the permanent magnet contains cerium element, and the total width of each pole magnet b m ⁇ 16 mm; and
  • the motor stator comprises a stator core and a stator winding wound on the stator core.
  • the stator core is arranged around the outer side of the rotor core.
  • the stator core is provided with Q stator teeth along the inner circumference.
  • the tooth width of the stator teeth is bt, and the relationship satisfies: Q ⁇ b t /(P ⁇ b m ) ⁇ 1.26 ⁇ 5 ⁇ Q ⁇ b t /(4 ⁇ P ⁇ b m ).
  • a compressor provided according to an embodiment of the third aspect of the present application includes the permanent magnet motor described above.
  • a refrigeration device provided according to an embodiment of the fourth aspect of the present application includes the compressor described above.
  • the refrigeration equipment is an air conditioner.
  • FIG1 is a schematic diagram of the structure of a permanent magnet motor of the present application.
  • FIG. 2 is a partial schematic diagram of a slot and a permanent magnet in a permanent magnet motor.
  • FIG. 3 is a graph showing the relationship between the addition of cerium and the decrease in the residual magnetism of a magnet.
  • Figure 4 is a graph comparing motor efficiency.
  • 200 motor stator
  • 210 stator yoke
  • 220 stator teeth
  • the present application provides a permanent magnet motor, which includes a motor rotor 100 and a motor stator 200 .
  • a permanent magnet motor which includes a motor rotor 100 and a motor stator 200 .
  • the motor rotor 100 includes a rotor core and a plurality of permanent magnets 120 disposed on the rotor core.
  • the number of poles of the motor rotor 100 is 2P ⁇ 8
  • the total width of each pole magnet is b m
  • the permanent magnet 120 contains a cerium element of x mass percent, and the relationship between b m satisfies: b m ⁇ 2200/(150-x);
  • the motor stator 200 includes a stator core and a stator winding (not shown) wound on the stator core.
  • the stator core is arranged around the outer side of the rotor core.
  • the stator core is provided with Q stator teeth 220 along the inner circumference.
  • the tooth width of the stator tooth 220 is b t , and the relationship is satisfied: Q ⁇ b t /(P ⁇ b m ) ⁇ 1.36-x/100 ⁇ 5 ⁇ Q ⁇ b t /(4 ⁇ P ⁇ b m ).
  • the permanent magnet motor of the present application includes a motor rotor 100 and a motor stator 200.
  • the motor rotor 100 includes a rotor core and a plurality of permanent magnets 120 disposed on the rotor core.
  • the number of poles of the motor rotor 100 is 2P ⁇ 8, the total width of each pole magnet is b m , the permanent magnet 120 contains a cerium element of x% by mass, and the relationship between b m satisfies: b m ⁇ 2200/(150-x);
  • the motor stator 200 includes a stator core and a stator winding wound on the stator core.
  • the stator core is disposed around the outer side of the rotor core.
  • the stator core is provided with Q stator teeth 220 along the inner circumference.
  • the stator teeth 220 The tooth width is b t , and the relationship satisfies: Q ⁇ b t /(P ⁇ b m ) ⁇ 1.36-x/100 ⁇ 5 ⁇ Q ⁇ b t /(4 ⁇ P ⁇ b m ).
  • the permanent magnet 120 contains a cerium element with a mass percentage of x%, thereby reducing the use of praseodymium, neodymium and heavy rare earth elements, and effectively controlling the cost.
  • the present application is based on the mass percentage of cerium elements in the permanent magnet.
  • the total width b m of each pole magnet, the number Q of stator teeth 220 and the number P of poles are newly designed.
  • the magnetic properties of the magnet meet the motor efficiency requirements, the efficiency of the motor can be optimized, and the motor cost is the lowest.
  • the excitation of the permanent magnet motor is provided by the permanent magnet 120 in the motor rotor 100, and the remanence Br and width of the permanent magnet 120 determine the magnetic flux that the motor rotor 100 can provide.
  • the number of motor pole pairs is P, and there are n magnets in each slot.
  • the total width of the n magnets is the total width bm of each pole magnet, and the magnetic flux that the permanent magnet 120 can provide is 2P ⁇ bm ⁇ Br . Due to the use of rare earth magnets containing cerium elements, the Br value decreases accordingly, and the excitation of the permanent magnet 120 is reduced as a whole.
  • the magnetic properties of the permanent magnet 120 can meet the motor efficiency requirements.
  • the magnetic flux generated by the permanent magnet 120 passes through the air gap 300, stator teeth 220, and stator yoke 210 between the motor stator 200 and the motor rotor 100, and then to the stator teeth 220, the air gap 300, and the permanent magnet 120 to form a completely closed magnetic line of force.
  • the width b t of the stator teeth 220 cannot be too large, otherwise the tooth magnetic density will be too small, which is not conducive to the performance; b t cannot be too small, otherwise the tooth magnetic density will be too high, resulting in a significant increase in the motor iron loss, which will reduce the motor efficiency.
  • the present application has found and verified through simulation analysis that when the parameters satisfy the relationship: Q ⁇ b t /(P ⁇ b m ) ⁇ 1.36-x/100 ⁇ 5 ⁇ Q ⁇ b t /(4 ⁇ P ⁇ b m ), the motor efficiency can reach the optimal level under the condition of equivalent cost.
  • the present application provides a permanent magnet motor, which includes a motor rotor 100 and a motor stator 200 .
  • a permanent magnet motor which includes a motor rotor 100 and a motor stator 200 .
  • the motor rotor 100 includes a rotor core and a plurality of permanent magnets 120 disposed on the rotor core.
  • the number of poles of the motor rotor 100 is 2P ⁇ 8, the total width of each pole magnet is bm, the permanent magnet 120 contains cerium element, and the total width of each pole magnet bm is ⁇ 16 mm.
  • the motor stator 200 includes a stator core and a stator winding (not shown) wound on the stator core.
  • the stator core is arranged around the outer side of the rotor core.
  • the stator core is provided with Q stator teeth 220 along the inner circumference.
  • the tooth width of the stator tooth 220 is bt, and the relationship satisfies: Q ⁇ b t /(P ⁇ b m ) ⁇ 1.26 ⁇ 5 ⁇ Q ⁇ b/(4 ⁇ P ⁇ b m ).
  • the excitation of the permanent magnet motor is provided by the permanent magnet 120 in the motor rotor 100, and the remanence Br and width of the permanent magnet 120 determine the magnetic flux that the motor rotor 100 can provide.
  • the number of motor pole pairs is P, and there are n magnets in each slot.
  • the total width of the n magnets is the total width bm of each pole magnet.
  • the magnetic flux that the permanent magnet 120 can provide is 2P ⁇ bm ⁇ Br . Due to the use of rare earth magnets containing cerium, the Br value decreases accordingly, and the excitation of the permanent magnet 120 is reduced as a whole. When bm ⁇ 16mm, the magnetic properties of the permanent magnet 120 can meet the motor efficiency requirements.
  • the magnetic flux generated by the permanent magnet 120 passes through the air gap 300, the stator teeth 220, and the stator yoke 210 between the motor stator 200 and the motor rotor 100, and then to the stator teeth 220, the air gap 300, and the permanent magnet 120 to form a whole closed magnetic line of force.
  • the width bt of the stator teeth 220 cannot be too large, otherwise the tooth magnetic density will be too small, which is not conducive to the performance; bt cannot be too small, otherwise the tooth magnetic density will be too high, resulting in a significant increase in the motor iron loss, which will reduce the motor efficiency.
  • the present application adopts a permanent magnet containing cerium, corresponding to a mass percentage of x% of cerium in the total weight of the permanent magnet.
  • the addition of cerium will cause the remanence of the magnet to decrease, and the remanence decrease is shown in reference to Figure 3. From Figure 3, it can be seen that the decrease in the remanence Br of the permanent magnet corresponding to different mass percentages of cerium in different permanent magnets. Due to the decrease in the remanence of the magnet, under the existing motor design, the motor flux is reduced, and the motor efficiency decreases significantly under the condition of equivalent cost.
  • the present application has made a new design of the motor structure size according to the mass percentage of x% of cerium in the permanent magnet.
  • the total width b m of each pole magnet satisfies: 15 mm ⁇ b m ⁇ 21 mm.
  • b m is the total width of each pole magnet.
  • b m is the sum of the widths of the two permanent magnets. Since the size of b m directly determines the size of the excitation magnetic field of the motor, if the motor magnetic field is designed to be too large, the magnetic circuit is easily saturated and the motor efficiency tends to the maximum value; at the same time, when the motor magnetic field is too small, the motor torque coefficient is small. Under the same load, the motor operating current increases, the motor copper loss increases significantly, and the motor efficiency decreases significantly. When 15mm ⁇ b m ⁇ 21mm, the motor has the best cost performance. When b m ⁇ 21mm, the motor efficiency does not increase significantly with the increase of the magnet width; when b m ⁇ 15mm, the motor efficiency decreases significantly.
  • the mass percentage x% of the cerium element in the permanent magnet satisfies: 3% ⁇ x% ⁇ 10%.
  • the mass percentage content of cerium in the permanent magnet is 3% to 10% as an appropriate range.
  • Table 1 lists the corresponding change values of (150-x) ⁇ b m when the mass percentage content of cerium x% changes from 0 to 13% when b m is 16 mm.
  • Table 2 lists the excitation flux in the motor, motor efficiency and motor cost when b m changes from 13mm to 24mm.
  • the permanent magnet contains dysprosium element, and the content of dysprosium element is less than 3wt%.
  • the permanent magnet contains dysprosium element, and the content of dysprosium element is less than 2.3wt%.
  • the permanent magnet contains dysprosium element, and the content of dysprosium element is about 2.25wt%.
  • Dysprosium is a silvery-white metal that is soft and can be cut with a knife. In addition to the chemical activity common to rare earth elements and the fact that it can be used as mixed rare earth metals and compounds, dysprosium also has excellent optical, electrical, magnetic and nuclear properties. Dysprosium is used as an additive to NdFeB permanent magnets. Adding about 2wt% to 3wt% of dysprosium to the magnet can increase its coercive force. With the increasing demand for NdFeB magnets, dysprosium has become a necessary additive element, and the demand is also increasing rapidly.
  • the permanent magnet contains praseodymium and neodymium elements, and the sum of the contents of praseodymium and neodymium elements is 20 wt % to 32 wt %.
  • the permanent magnet contains praseodymium and neodymium elements, and the sum of the contents of praseodymium and neodymium elements is 25wt% to 32wt%.
  • the permanent magnet contains praseodymium and neodymium elements, and the sum of the contents of praseodymium and neodymium elements is 25 wt %.
  • the permanent magnet contains cobalt element, and the content of cobalt element is 1wt% to 2wt%.
  • a plurality of slots 110 are provided on the end surface of the rotor core along the circumferential direction of the rotor core, and each permanent magnet 120 is correspondingly embedded in each slot 110 .
  • the slot 110 is V-shaped.
  • the V-shaped opening faces the motor stator 200 .
  • the slot 110 is V-shaped, which can enhance the anti-demagnetization ability of the motor and make the demagnetization ability of the motor not lower than that of the existing conventional rare earth magnet.
  • the stator winding is divided into concentrated winding and distributed winding.
  • Concentrated winding refers to the winding in which the coil is wound on one stator tooth.
  • Distributed winding refers to the winding in which the coil is wound on multiple stator teeth.
  • the span of the concentrated winding is 1, such as slot one to slot two; while the span of the distributed winding is not 1, such as the span is 3, and the winding is from slot one to slot four.
  • the "slot” here refers to the area formed between the stator tooth and the stator tooth.
  • the end height of the concentrated winding is small and the cost is low; the end height of the distributed winding is relatively larger and the cost is higher, but the motor operation noise is smaller.
  • stator windings distributed on different stator teeth are connected in series or in parallel.
  • the series winding used on a relatively thicker wire diameter motor can achieve a higher back electromotive force and improve the efficiency of medium and low frequency motors.
  • the motor cost and motor efficiency of the permanent magnet motor of the present application and the conventional permanent magnet motor are compared, and the results are shown in Table 3 and Figure 4.
  • the content of praseodymium and neodymium is 25wt%
  • the content of cerium is 5wt%
  • the content of dysprosium is 2.25wt%
  • the content of cobalt is 1.5wt%
  • the remaining elements are iron.
  • the Q ⁇ b t /(P ⁇ b m ) of the conventional motor 1 is 1.34, and the value of 1.36-x is 1.26, which does not satisfy the Q ⁇ b t /(P ⁇ b m ) ⁇ 1.36-x/100 defined in the present application.
  • the Q ⁇ b t /(P ⁇ b m ) of the conventional motor 2 is 1.30, and the value of 1.36-x is 1.26, which also does not satisfy the Q ⁇ b t /(P ⁇ b m ) ⁇ 1.36-x/100 defined in the present application.
  • motor efficiency refers to the ratio of the motor's output power to its input power.
  • motor efficiency refers to the ratio of the motor's output power to its input power.
  • a 0.5% increase in motor efficiency can be considered a significant efficiency improvement.
  • the number Q of stator teeth satisfies: Q ⁇ 12.
  • the number of stator teeth Q is greater than or equal to 12, and the number of phases of the stator winding is 3. In this design, the number of phases of the stator winding is specifically designed to be 3, which is suitable for the motors required by most compressor products.
  • the tooth width b t of the stator teeth satisfies: 5 mm ⁇ b t ⁇ 9 mm.
  • the width of the stator teeth b t cannot be too large. If it is too large, the stator slot area is small. Under the same number of motor turns, the copper wire gauge is small, and the copper loss of the motor increases significantly. At the same time, the tooth magnetic density will be too small, which is not conducive to the performance. b t cannot be too small. If it is too small, the same rotor magnetic flux flows through the stator teeth, and the stator tooth magnetic density will be high, and the motor iron loss will increase significantly. At the same time, the tooth magnetic density is too high, resulting in a significant increase in the motor iron loss, which will reduce the motor efficiency. Therefore, in order to balance the motor iron loss and copper loss, 5mm ⁇ b t ⁇ 9mm is the appropriate range.
  • the present application provides a compressor, the compressor comprising the present application A permanent magnet motor.
  • the permanent magnet motor includes a motor rotor and a motor stator.
  • the motor rotor includes a rotor core and a plurality of permanent magnets arranged on the rotor core.
  • the number of poles of the motor rotor is 2P ⁇ 8
  • the total width of each pole magnet is b m
  • the permanent magnet contains a mass percentage of x% cerium element, and the relationship between b m satisfies: b m ⁇ 2200/(150-x)
  • the motor stator includes a stator core and a stator winding wound on the stator core.
  • the stator core is arranged around the outer side of the rotor core.
  • the stator core is provided with Q stator teeth along the inner circumference.
  • the tooth width of the stator teeth is b t , and the relationship satisfies: Q ⁇ b t /(P ⁇ b m ) ⁇ 1.36-x/100 ⁇ 5 ⁇ Q ⁇ b t /(4 ⁇ P ⁇ b m ).
  • the permanent magnet contains a mass percentage of x% cerium element, thereby reducing the use of praseodymium, neodymium and heavy rare earth elements, and effectively controlling the cost.
  • the total width of the magnet bm, the cerium content x, the number of stator teeth Q and the number of poles P are matched according to the cerium content x in the permanent magnet.
  • the excitation of the permanent magnet motor is provided by the permanent magnet in the motor rotor.
  • the remanence Br and width of the permanent magnet determine the magnetic flux that the motor rotor can provide.
  • the number of motor pole pairs is P, and there are n magnets in each slot.
  • the total width of the n magnets is the total width bm of each pole magnet.
  • the magnetic flux that the permanent magnet can provide is 2P ⁇ bm ⁇ Br . Due to the use of rare earth magnets containing cerium elements, the Br value decreases accordingly, and the excitation of the permanent magnet is reduced as a whole.
  • the relationship between bm satisfies bm ⁇ 2200/(150-x)
  • the magnetic properties of the magnet can meet the motor efficiency requirements.
  • the magnetic flux generated by the permanent magnet passes through the air gap between the motor stator and the motor rotor, the stator teeth, the stator yoke, and then to the stator teeth, air gap, and permanent magnets to form a closed magnetic line of force.
  • the width bt of the stator teeth cannot be too large, otherwise the tooth magnetic density will be too small, which is not conducive to the performance; bt cannot be too small, otherwise the tooth magnetic density will be too high, resulting in a significant increase in the motor iron loss, which will reduce the motor efficiency.
  • the present application has found and verified that when the parameters satisfy the relationship: Q ⁇ b t /(P ⁇ b m ) ⁇ 1.36-x/100 ⁇ 5 ⁇ Q ⁇ b t /(4 ⁇ P ⁇ b m ), the motor efficiency can reach the optimal level under the condition of equivalent cost. Furthermore, under the condition of equivalent cost, the compressor efficiency can reach the optimal level.
  • a refrigeration device in some other embodiments of the present application, includes a compressor.
  • the compressor in the refrigeration equipment of the present application contains the permanent magnet motor of the present application, and the permanent magnet motor includes a motor rotor and a motor stator.
  • the motor rotor includes a rotor core and a plurality of permanent magnets arranged on the rotor core, the number of poles of the motor rotor is 2P ⁇ 8, the total width of each pole magnet is b m , the permanent magnet contains a mass percentage of x% of cerium, and the relationship between b m satisfies: b m ⁇ 2200/(150-x);
  • the motor stator includes a stator core and a stator wound on the stator core.
  • the stator core is arranged around the outer side of the rotor core, the stator core is provided with Q stator teeth along the inner circumference, the tooth width of the stator teeth is b t , and the relationship is satisfied: Q ⁇ b t /(P ⁇ b m ) ⁇ 1.36-x/100 ⁇ 5 ⁇ Q ⁇ b t /(4 ⁇ P ⁇ b m ).
  • the permanent magnet contains x% of cerium by mass, thereby reducing the use of praseodymium, neodymium and heavy rare earth elements, and effectively controlling the cost.
  • the present application proposes a permanent magnet motor, according to the mass percentage x% of cerium element in the permanent magnet, the total width b m of each pole magnet, the number of stator teeth Q and the number of poles P are matched.
  • the magnetic properties of the magnet meet the efficiency requirements of the motor, the efficiency of the motor can be optimized, and the cost of the motor is minimized.
  • the excitation of the permanent magnet motor is provided by the permanent magnet in the motor rotor, and the remanence Br and width of the permanent magnet determine the magnetic flux that the motor rotor can provide.
  • the number of motor pole pairs is P, and there are n magnets in each slot.
  • the total width of the n magnets is the total width bm of each pole magnet, and the magnetic flux that the permanent magnet can provide is 2P ⁇ bm ⁇ Br . Due to the use of rare earth magnets containing cerium elements, the Br value decreases accordingly, and the excitation of the permanent magnet is reduced as a whole.
  • the magnetic properties of the magnet can meet the motor efficiency requirements.
  • the magnetic flux generated by the permanent magnet passes through the air gap, stator teeth, and stator yoke between the motor stator and the motor rotor, and then to the stator teeth, air gap, and permanent magnet to form a completely closed magnetic line of force.
  • the width b t of the stator teeth cannot be too large, otherwise the tooth magnetic density will be too small, which is not conducive to the performance; b t cannot be too small, otherwise the tooth magnetic density will be too high, resulting in a significant increase in the motor iron loss, which will reduce the motor efficiency.
  • the refrigeration device is an air conditioner.
  • the air conditioner is a household air conditioner.
  • cerium-containing permanent magnets involved in the technical solution of this application are all products already available on the market. This application is based on the content of cerium in the cerium-containing permanent magnets, and through the structural design of the total width bm of each pole magnet, the number of stator teeth Q, the tooth width of the stator teeth bt and the number of poles P, to ultimately improve the performance of permanent magnet motors, compressors and refrigeration equipment.
  • first and second are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as “first” or “second” may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of “plurality” is two or more, unless otherwise clearly and specifically defined.
  • the terms “installed”, “connected”, “connected”, “fixed” and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements.
  • installed can be a fixed connection, a detachable connection, or an integral connection
  • it can be a mechanical connection, an electrical connection, or a communication
  • it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

L'invention concerne un moteur à aimant permanent, un compresseur et un dispositif de réfrigération, le moteur à aimant permanent comprenant un rotor de moteur (100) et un stator de moteur (200). Le rotor de moteur (100) comprend un noyau rotorique et de multiples aimants permanents (120) disposés sur le noyau rotorique, le nombre de pôles 2P du rotor de moteur (100) est supérieur ou égal à 8, la largeur totale de chaque aimant de pôle est de bm, l'aimant permanent (120) contient x % de cérium élémentaire en masse, et bm satisfait la relation suivante : bm ≥ 2200/(150-x). Le stator de moteur (200) comprend un noyau statorique et un enroulement statorique enroulé autour du noyau statorique, le noyau statorique est situé autour de l'extérieur du noyau statorique, le noyau statorique est pourvu d'un nombre Q de dents statoriques (220) le long d'une circonférence interne, la largeur de dent des dents statoriques (220) est de bt, et la relation suivante est satisfaite : Q×bt/(P×bm) ≤ 1,36-x/100 ≤ 5×Q×b t/(4×P×b m).
PCT/CN2023/124743 2022-10-21 2023-10-16 Moteur à aimant permanent, compresseur et dispositif de réfrigération WO2024083076A1 (fr)

Applications Claiming Priority (4)

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CN202211296971.6 2022-10-21
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JP2010034522A (ja) * 2008-06-23 2010-02-12 Toshiba Corp 永久磁石およびその製造方法、モータ用永久磁石および永久磁石モータ
CN111555478A (zh) * 2020-05-26 2020-08-18 安徽美芝精密制造有限公司 电机、压缩机和制冷设备
CN114285200A (zh) * 2021-12-31 2022-04-05 淮安威灵电机制造有限公司 电机的转子和电机
CN218387003U (zh) * 2022-10-21 2023-01-24 广东美芝制冷设备有限公司 永磁电机、压缩机和制冷设备

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010034522A (ja) * 2008-06-23 2010-02-12 Toshiba Corp 永久磁石およびその製造方法、モータ用永久磁石および永久磁石モータ
CN111555478A (zh) * 2020-05-26 2020-08-18 安徽美芝精密制造有限公司 电机、压缩机和制冷设备
CN114285200A (zh) * 2021-12-31 2022-04-05 淮安威灵电机制造有限公司 电机的转子和电机
CN218387003U (zh) * 2022-10-21 2023-01-24 广东美芝制冷设备有限公司 永磁电机、压缩机和制冷设备

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