CN113410933A - Design method of motor rotor, motor rotor and double-winding motor - Google Patents
Design method of motor rotor, motor rotor and double-winding motor Download PDFInfo
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- CN113410933A CN113410933A CN202110720974.7A CN202110720974A CN113410933A CN 113410933 A CN113410933 A CN 113410933A CN 202110720974 A CN202110720974 A CN 202110720974A CN 113410933 A CN113410933 A CN 113410933A
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- 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
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- 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
- H02K1/2746—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 arranged with the same polarity, e.g. consequent pole type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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Abstract
The invention provides a design method of a motor rotor, the motor rotor and a double-winding motor, wherein the design method of the motor rotor comprises the following steps: acquiring the maximum circumferential width Wd of permanent magnet groups under the same magnetic pole of a motor rotor and the minimum circumferential distance Wq of permanent magnet groups under adjacent magnetic poles; matching the value range of the corresponding E1/E2 according to the size relation between the Wd and the Wq; obtaining the arrangement type of the permanent magnet groups under the same magnetic pole; and adjusting the lengths of the high-coercivity permanent magnet and the low-coercivity permanent magnet in the lower permanent magnet group of the same magnetic pole to enable the E1/E2 to be in a value range. According to the invention, the proper no-load back electromotive force E1/E2 can be correspondingly matched according to the magnitude relation of the rotor magnetic circuit parameters Wd and Wq, so that the specific arrangement type of the permanent magnet in the magnetic pole of the motor rotor is guided, and the designed motor rotor is in accordance with the matched E1/E2, thereby realizing that the designed motor can adapt to the load requirements of different frequencies and working conditions, and has high back electromotive force at low frequency and low back electromotive force at high frequency.
Description
Technical Field
The invention belongs to the technical field of motor design, and particularly relates to a motor rotor design method, a motor rotor and a double-winding motor.
Background
Modern industry demands motors capable of as large a motor efficiency as possible over an extremely wide frequency range to meet energy saving requirements. And the conventional motor can only satisfy the maximization of single-point efficiency, and in certain interval frequency, along with the increase of frequency, the conventional motor efficiency is gradually attenuated after increasing to the maximum value, can't satisfy the high-efficient of interval operation.
Disclosure of Invention
Therefore, the invention provides a design method of a motor rotor, the motor rotor and a double-winding motor, which can correspondingly match proper no-load back electromotive force E1/E2 according to the magnitude relation of rotor magnetic circuit parameters Wd and Wq, further guide the specific arrangement type of permanent magnets in magnetic poles of the motor rotor, and enable the designed motor rotor to conform to matched E1/E2, thereby realizing that the designed motor can adapt to the load requirements of different frequencies and working conditions, has high back electromotive force at low frequency and low back electromotive force at high frequency, meets the requirements of high energy efficiency of low frequency and wide range of high frequency, and achieves high efficiency of regional operation.
In order to solve the above problems, the present invention provides a method for designing a motor rotor, wherein the motor rotor is applied to a double-winding motor, and a single-layer permanent magnet structure is provided below a same magnetic pole of the motor rotor, the method comprising the following steps:
acquiring the maximum circumferential width Wd of permanent magnet groups under the same magnetic pole of a motor rotor and the minimum circumferential distance Wq of permanent magnet groups under adjacent magnetic poles;
matching a corresponding value range of E1/E2 according to the magnitude relation between the Wd and the Wq, wherein E1 is the no-load back electromotive force of the double-winding motor in a permanent magnet magnetizing mode, and E2 is the no-load back electromotive force of the double-winding motor in a permanent magnet demagnetizing mode;
obtaining the arrangement type of the permanent magnet groups under the same magnetic pole;
and adjusting the lengths of the high-coercivity permanent magnet and the low-coercivity permanent magnet in the lower permanent magnet group of the same magnetic pole to enable E1/E2 to be in the value range.
Preferably, the first and second electrodes are formed of a metal,
when the arrangement type is a straight line type, the permanent magnet group comprises a first high-coercivity permanent magnet, a first low-coercivity permanent magnet and a second low-coercivity permanent magnet, wherein the first low-coercivity permanent magnet and the second low-coercivity permanent magnet are respectively arranged at two ends of the length of the first high-coercivity permanent magnet, the length of the first high-coercivity permanent magnet is H1, the lengths of the first low-coercivity permanent magnet and the second low-coercivity permanent magnet are equal and are both H2, and the H1 and the H2 are adjusted according to the following modes:
when Wq is more than or equal to Wd, (2H2+ H1)/H1 is E1/E2 is more than or equal to 3;
when 0.6Wd ≦ Wq < Wd, 2 ≦ (2H2+ H1)/H1 ≦ E1/E2 < 3;
when 0.1Wd is less than or equal to Wq<At the time of 0.6Wd,
when Wq is<At the time of 0.1Wd,
preferably, the first and second electrodes are formed of a metal,
when the arrangement type is a straight line type, the permanent magnet group comprises a second high-coercivity permanent magnet, a third high-coercivity permanent magnet and a third low-coercivity permanent magnet, wherein the second high-coercivity permanent magnet and the third high-coercivity permanent magnet are respectively arranged at two ends of the length of the third low-coercivity permanent magnet, the length of the third low-coercivity permanent magnet is H3, the lengths of the second high-coercivity permanent magnet and the third high-coercivity permanent magnet are equal and are both H4, and the H3 and the H4 are adjusted according to the following modes:
when Wq is more than or equal to Wd, (2H3+ H4)/2H3 is E1/E2 is more than or equal to 3;
when 0.6Wd ≦ Wq < Wd, 2 ≦ (2H3+ H4)/2H3 ≦ E1/E2 < 3;
when 0.1Wd is less than or equal to Wq<At the time of 0.6Wd,
when Wq is<At the time of 0.1Wd,
preferably, the first and second electrodes are formed of a metal,
the third low coercive force permanent magnet is smaller in magnetization thickness than the second high coercive force permanent magnet and the third high coercive force permanent magnet.
Preferably, the first and second electrodes are formed of a metal,
when the arrangement type is V-shaped, the permanent magnet group includes a fourth high coercivity permanent magnet and a fourth low coercivity permanent magnet which are located in a first magnetic steel groove, and a fifth low coercivity permanent magnet and a fifth high coercivity permanent magnet which are located in a second magnetic steel groove, wherein the first magnetic steel groove and the second magnetic steel groove are arranged in a V shape, the fourth low coercivity permanent magnet is located at a proximal end of the fourth high coercivity permanent magnet, the fifth low coercivity permanent magnet is located at a proximal end of the fifth high coercivity permanent magnet, the fourth high coercivity permanent magnet and the fifth high coercivity permanent magnet are equal in length and are both H5, the fourth low coercivity permanent magnet and the fifth low coercivity permanent magnet are equal in length and are both H6, and H5 and H6 are adjusted according to the following manners:
when Wq is greater than or equal to Wd,
when 0.6Wd is less than or equal to Wq<When the number of the channels is Wd,
when 0.1Wd is less than or equal to Wq<At the time of 0.6Wd,
when Wq is<At the time of 0.1Wd,
preferably, the first and second electrodes are formed of a metal,
the fourth low coercive force permanent magnet has a larger magnetization thickness than the fourth high coercive force permanent magnet and the fifth high coercive force permanent magnet, and the fifth low coercive force permanent magnet has a larger magnetization thickness than the fourth high coercive force permanent magnet and the fifth high coercive force permanent magnet.
Preferably, the first and second electrodes are formed of a metal,
when the arrangement type is a W shape, the permanent magnet group includes a sixth high coercive force permanent magnet in a third magnetic steel groove, a sixth low coercive force permanent magnet in a fourth magnetic steel groove, a seventh low coercive force permanent magnet in a fifth magnetic steel groove, and a seventh high coercive force permanent magnet in a sixth magnetic steel groove, the third magnetic steel groove, the fourth magnetic steel groove, the fifth magnetic steel groove, and the sixth magnetic steel groove are sequentially arranged in a W shape along a clockwise direction of the corresponding rotor core, the sixth high coercive force permanent magnet and the seventh high coercive force permanent magnet are equal in length and are all H7, the sixth low coercive force permanent magnet and the seventh low coercive force permanent magnet are equal in length and are all H8, and the H7 and H8 are adjusted according to the following manner:
when Wq is more than or equal to Wd, (H7+ H8)/H7 is E1/E2 is more than or equal to 3;
when 0.6Wd ≦ Wq < Wd, 2 ≦ (H7+ H8)/H7 ≦ E1/E2 < 3;
when 0.1Wd is less than or equal to Wq<At the time of 0.6Wd,
when Wq is<At the time of 0.1Wd,
preferably, the first and second electrodes are formed of a metal,
10V≤E2≤80V。
the invention also provides a motor rotor which is designed and manufactured by adopting the design method of the motor rotor.
The invention also provides a double-winding motor which comprises the motor rotor.
According to the design method of the motor rotor, the motor rotor and the double-winding motor, the proper no-load back electromotive force E1/E2 is correspondingly matched according to the magnitude relation of the rotor magnetic circuit parameters Wd and Wq, and further the specific arrangement type of the permanent magnet in the magnetic pole of the motor rotor is guided, so that the designed motor rotor conforms to the matched E1/E2, the designed motor can meet the load requirements of different frequencies and working conditions, the high back electromotive force exists at low frequency, the low back electromotive force exists at high frequency, the high energy efficiency of the low frequency and the wide range of the high frequency are met, and the high efficiency of regional operation is achieved.
Drawings
FIG. 1 is a step diagram of a method of designing a rotor for an electric machine in accordance with an embodiment of the present invention;
fig. 2 is a schematic view of a rotor structure in which permanent magnets are arranged in a straight line, the arrows showing the polarization directions;
FIG. 3 is a schematic view of another rotor structure in which permanent magnets are arranged in a straight line; (ii) a
FIG. 4 is a schematic view of a rotor structure with a V-shaped permanent magnet arrangement;
fig. 5 is a schematic structural view of a rotor with a W-shaped arrangement pattern of permanent magnets.
The reference numerals are represented as:
11. a first high coercivity permanent magnet; 12. a first low coercive force permanent magnet; 13. a second low coercive force permanent magnet; 21. a second high coercivity permanent magnet; 22. a third high coercivity permanent magnet; 23. a third low coercive force permanent magnet; 31. a first magnetic steel slot; 32. a fourth high coercivity permanent magnet; 33. a fourth low coercive force permanent magnet; 34. a second magnetic steel slot; 35. a fifth low coercive force permanent magnet; 36. a fifth high coercive force permanent magnet; 41. a third magnetic steel groove; 42. a sixth high coercive force permanent magnet; 43. a fourth magnetic steel groove; 44. a sixth low coercive force permanent magnet; 45. a fifth magnetic steel groove; 46. a seventh low coercive force permanent magnet; 47. a sixth magnetic steel groove; 48. a seventh high coercive force permanent magnet.
Detailed Description
The motor is provided with a permanent magnet to form no-load counter electromotive force, and when the load is constant, the higher the no-load counter electromotive force is, the lower the running current of the motor is, and the corresponding efficiency is higher. Along with the increase of the operation frequency, the induced electromotive force at the two ends of the motor is increased, and when the maximum voltage of the controller is reached, the higher the frequency is, the larger the current is, and the efficiency of the motor is attenuated. The greater the motor no-load back emf, the higher the low frequency efficiency and the lower the high frequency efficiency, and vice versa. The present invention can solve this problem. The controller detects the magnetic circuit structure of the motor, and the no-load counter electromotive force of the motor is intelligently adjusted, so that the running current of the motor is always in a small value, and the running efficiency of the motor interval is improved.
One theory of adjusting the no-load back electromotive force is through the winding connection way, which is the conventional technology at present, and the ratio of the back electromotive force which can only be adjusted is as follows
Or 2, is extremely limited. The second theory is that the flux linkage of the permanent magnet is directly adjusted, the mode is a hotspot and difficulty for research of a plurality of motor designers at present, and the ratio of the adjusted back electromotive force is mostly within 1.4, so that the requirement is difficult to meet.
In order to improve the range of the adjusted back electromotive force, the invention combines two theories, automatically adjusts the back electromotive force of various modes aiming at different motor magnetic circuit characteristics, and greatly improves the operation efficiency of the motor interval.
In the motor rotor embedded with the permanent magnets, the minimum width formed by the permanent magnets and the permanent magnet grooves under each magnetic pole is Wd (namely the maximum circumferential width of the permanent magnet groups under the same magnetic pole), the minimum width formed by the permanent magnets and the permanent magnet grooves between adjacent magnetic poles is Wq (namely the minimum circumferential distance of the permanent magnet groups under the adjacent magnetic poles), and the saturation degree of a magnetic circuit and the size of inductance are influenced by the width of the Wq and the Wd which are circulation paths of the magnetic fields of the stator and the rotor. In the design of the motor, the magnitudes of Wd and Wq are opposite, and the larger Wd is, the smaller Wq is. The larger Wd and the smaller Wq are, the more the permanent magnet is used, the higher the no-load counter electromotive force of the motor is, and correspondingly, the more difficult the control current is to charge and demagnetize the permanent magnet, namely, the difficulty in regulating the no-load counter electromotive force is. When Wd is smaller and Wq is larger, the using amount of the permanent magnet is smaller, the closer to the outer diameter of the rotor, the lower the no-load counter electromotive force of the motor is, and the easier the controller is to charge and demagnetize the permanent magnet. Based on this, the ratio of different Wq and Wd was investigated experimentally:
when the magnetic circuit of the motor has Wd less than or equal to Wq, under a certain winding turns, the no-load back electromotive force generated by the magnetic field of the permanent magnet of the motor is at an extremely low value, so that the high-frequency operation range can be greatly improved, but in order to improve the amplitude of the back electromotive force, the controller regulates and controls two working modes (a magnetizing mode and a demagnetizing mode, the same is applied below), and the optimal combination is E1/E2 less than or equal to 3.
When the motor magnetic circuit has 0.6Wd which is not less than Wq and is less than Wd, the Wq value is still at a low value, and in order to increase the low-frequency efficiency, the controller regulates two working modes to ensure that the E1/E2 is not less than 2 and not more than 3, so that the counter electromotive force of the low-frequency mode is at least more than 2 times of that of the high-frequency mode.
When the magnetic circuit of the motor exists 0.1Wd ≤ Wq<At 0.6Wd, the width of Wq and Wd has a large influence on the inductance, the larger Wq, the larger the quadrature axis inductance, and the smaller the no-load back electromotive force under the same permanent magnet consumption, and the optimal combination is that the comprehensive efficiency in the high-frequency and low-frequency regions is obtained at the moment
When the motor magnetic circuit exists Wq<At 0.1Wd, the permanent magnetic flux linkage is at a higher value, and the controller adjusts two working modes, so that
Referring to fig. 1 to 5 in combination, according to an embodiment of the present invention, a method for designing a motor rotor is provided, where the motor rotor is applied to a dual-winding motor (that is, a motor with multiple winding switching modes, which may also be referred to as a dual-outgoing-line motor), and a single-layer permanent magnet structure is provided below a same magnetic pole of the motor rotor, and the method includes the following steps:
acquiring the maximum circumferential width Wd (which can also be understood as the magnetic path width of a permanent magnet) of a permanent magnet group under the same magnetic pole of the motor rotor and the minimum circumferential distance Wq of the permanent magnet groups under adjacent magnetic poles;
matching a corresponding value range of E1/E2 according to the magnitude relation of the Wd and the Wq, wherein E1 is the no-load counter electromotive force of the double-winding motor in a permanent magnet magnetizing mode, and E2 is the no-load counter electromotive force of the double-winding motor in a permanent magnet demagnetizing mode, so that the regulation of E1 and E2 is controlled by utilizing different magnetizing and demagnetizing capabilities of different coercive forces, when a value of E1 is taken, the low coercive force permanent magnet is in a fully magnetizing state, and when a value of E2 is taken, the low coercive force permanent magnet is in a fully demagnetizing state;
obtaining the arrangement type of the permanent magnet groups under the same magnetic pole, wherein the arrangement type can be a linear type, a V type or a W type;
and adjusting the lengths of the high-coercivity permanent magnet and the low-coercivity permanent magnet in the lower permanent magnet group of the same magnetic pole to enable E1/E2 to be in the value range.
In the technical scheme, proper no-load back electromotive force E1/E2 is correspondingly matched according to the size relation of rotor magnetic circuit parameters Wd and Wq, and further the specific arrangement type of a permanent magnet in a magnetic pole of the motor rotor is guided, so that the designed motor rotor conforms to matched E1/E2, the designed motor can meet the load requirements of different frequencies and working conditions, high back electromotive force exists at low frequency, low back electromotive force exists at high frequency, the high energy efficiency of low frequency and the wide range of high frequency are met, and the high efficiency of regional operation is achieved.
In some embodiments, referring to fig. 2, when the arrangement pattern is a straight line, the permanent magnet group includes a first high-coercivity permanent magnet 11, a first low-coercivity permanent magnet 12 and a second low-coercivity permanent magnet 13, wherein the first low-coercivity permanent magnet 12 and the second low-coercivity permanent magnet 13 are respectively located at two ends of the length of the first high-coercivity permanent magnet 11, that is, two low-coercivity permanent magnets are located at two ends of the middle high-coercivity permanent magnet and close to the outer side of the rotor, the length of the first high-coercivity permanent magnet 11 is H1, the lengths of the first low-coercivity permanent magnet 12 and the second low-coercivity permanent magnet 13 are equal and both are H2 (preferably, the magnetization length of the low-coercivity permanent magnet is smaller than that of the high-coercivity permanent magnet, that is, H1 > H2, so that the low-coercivity permanent magnet is easy to charge and demagnetize), the H1 and H2 were adjusted according to the following:
when Wq is more than or equal to Wd, (2H2+ H1)/H1 is E1/E2 is more than or equal to 3;
when 0.6Wd ≦ Wq < Wd, 2 ≦ (2H2+ H1)/H1 ≦ E1/E2 < 3;
when 0.1Wd is less than or equal to Wq<At the time of 0.6Wd,
when Wq is<At the time of 0.1Wd,
from the above, the ratio of E1 and E2 is related to the magnetic path width of the high-low coercive force permanent magnet, and it is obvious that the larger H1 and H2 are, the larger the magnetic linkage in the magnetized state is, the larger the back electromotive force is, the larger H1 is, the larger the magnetic linkage in the demagnetized state is, and the larger the back electromotive force is.
In some embodiments, referring to fig. 3, when the arrangement pattern is a straight line, the permanent magnet group includes a second high-coercivity permanent magnet 21, a third high-coercivity permanent magnet 22 and a third low-coercivity permanent magnet 23, wherein the second high-coercivity permanent magnet 21 and the third high-coercivity permanent magnet 22 are respectively located at two ends of the length of the third low-coercivity permanent magnet 23, that is, two high-coercivity permanent magnets are located at two ends of the middle low-coercivity permanent magnet and are close to the outer side of the rotor, the length of the third low-coercivity permanent magnet 23 is H3, the lengths of the second high-coercivity permanent magnet 21 and the third high-coercivity permanent magnet 22 are equal and are both H4, and the H3 and H4 are adjusted according to the following method:
when Wq is more than or equal to Wd, (2H3+ H4)/2H3 is E1/E2 is more than or equal to 3;
when 0.6Wd ≦ Wq < Wd, 2 ≦ (2H3+ H4)/2H3 ≦ E1/E2 < 3;
when 0.1Wd is less than or equal to Wq<At the time of 0.6Wd,
when Wq is<At the time of 0.1Wd,
preferably, the third low-coercive-force permanent magnet 23 has a smaller magnetization thickness (thickness in the rotor radial direction) than the second high-coercive-force permanent magnet 21 and the third high-coercive-force permanent magnet 22.
Specifically, referring to the arrangement type structure of the linear magnetic steel shown in fig. 2 and 3, the back electromotive force adjustment of the linear magnetic steel structure is divided into two cases: in the second case, in order to demagnetize the middle magnetic steel, the width of the middle magnetic steel is set to be smaller than that of the magnetic steels at the two ends (shown in fig. 3), and the coercive force is smaller than that of the magnetic steels at the two ends; in case one, in order to demagnetize the magnetic steels at the two ends, the coercive force is set to be smaller than that of the middle magnetic steel (corresponding to fig. 2).
In some embodiments, referring to fig. 4, when the arrangement is V-shaped, the permanent magnet group includes a fourth high coercive force permanent magnet 32 and a fourth low coercive force permanent magnet 33 in a first magnetic steel slot 31, a fifth low coercive force permanent magnet 35 and a fifth high coercive force permanent magnet 36 in a second magnetic steel slot 34, wherein the first magnetic steel slot 31 and the second magnetic steel slot 34 are arranged in V-shaped, the fourth low coercive force permanent magnet 33 is at the proximal end of the fourth high coercive force permanent magnet 32, the fifth low coercive force permanent magnet 35 is at the proximal end of the fifth high coercive force permanent magnet 36, the fourth high coercive force permanent magnet 32 and the fifth high coercive force permanent magnet 36 are equal in length and are both H5, the fourth low coercive force permanent magnet 33 and the fifth low coercive force permanent magnet 35 are equal in length and are both H6, the H5 and H6 were adjusted according to the following:
when Wq is greater than or equal to Wd,
when 0.6Wd is less than or equal to Wq<When the number of the channels is Wd,
when 0.1Wd is less than or equal to Wq<At the time of 0.6Wd,
when Wq is<At the time of 0.1Wd,
preferably, the fourth low coercive force permanent magnet 33 is larger in magnetization thickness than the fourth high coercive force permanent magnet 32 and the fifth high coercive force permanent magnet 36, and the fifth low coercive force permanent magnet 35 is larger in magnetization thickness than the fourth high coercive force permanent magnet 32 and the fifth high coercive force permanent magnet 36.
In some embodiments, referring to fig. 5, when the arrangement is W-shaped, the permanent magnet groups include a sixth high coercive force permanent magnet 42 in a third magnetic steel groove 41, a sixth low coercive force permanent magnet 44 in a fourth magnetic steel groove 43, a seventh low coercive force permanent magnet 46 in a fifth magnetic steel groove 45, a seventh high coercive force permanent magnet 48 in a sixth magnetic steel groove 47, the third magnetic steel slot 41, the fourth magnetic steel slot 43, the fifth magnetic steel slot 45 and the sixth magnetic steel slot 47 are sequentially arranged in a W shape along the clockwise direction of the corresponding rotor iron core, the sixth high-coercive-force permanent magnet 42 and the seventh high-coercive-force permanent magnet 48 are equal in length and are both H7, the sixth low coercive force permanent magnet 44 and the seventh low coercive force permanent magnet 46 are equal in length and are both H8, and H7 and H8 are adjusted according to the following manner:
when Wq is more than or equal to Wd, (H7+ H8)/H7 is E1/E2 is more than or equal to 3;
when 0.6Wd ≦ Wq < Wd, 2 ≦ (H7+ H8)/H7 ≦ E1/E2 < 3;
when 0.1Wd is less than or equal to Wq<At the time of 0.6Wd,
when Wq is<At the time of 0.1Wd,
in some embodiments, 10V E2 80V, so that the corresponding motor can rotate at least 6000 rpm.
The motor rotor and the corresponding motor are designed and manufactured by the design method of the motor rotor, and in the aspect of specific control, the controller is provided with a corresponding controller, the controller controls the magnetization and demagnetization of the permanent magnets in the permanent magnet group correspondingly arranged in the motor through current (namely, the motor has the switching between the magnetization mode and the demagnetization mode), the capability of protecting the misoperation of the motor is required, the function of monitoring and protecting the current of a motor winding in real time is required, and the function of protecting the motor from being demagnetized due to abnormal impact such as overheating and overcurrent is provided, so that the stability of the system is maintained. The controller detects the operating current to operate in a mode in which the operating current is the minimum in the plurality of modes under different conditions. Further preferably, when the controller switches the operation modes (E1 and E2) of different back electromotive forces, the induced voltage of the motor does not change with the rotation speed, and at the moment, the motor reaches a saturated state, so that the state before switching can be fully utilized, and the high-efficiency interval is prolonged.
According to an embodiment of the invention, there is also provided a double-winding motor including the motor rotor described above.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.
Claims (10)
1. A design method of a motor rotor is applied to a double-winding motor, and a single-layer permanent magnet structure is arranged below the same magnetic pole of the motor rotor, and is characterized by comprising the following steps:
acquiring the maximum circumferential width Wd of permanent magnet groups under the same magnetic pole of a motor rotor and the minimum circumferential distance Wq of permanent magnet groups under adjacent magnetic poles;
matching a corresponding value range of E1/E2 according to the magnitude relation between the Wd and the Wq, wherein E1 is the no-load back electromotive force of the double-winding motor in a permanent magnet magnetizing mode, and E2 is the no-load back electromotive force of the double-winding motor in a permanent magnet demagnetizing mode;
obtaining the arrangement type of the permanent magnet groups under the same magnetic pole;
and adjusting the lengths of the high-coercivity permanent magnet and the low-coercivity permanent magnet in the lower permanent magnet group of the same magnetic pole to enable E1/E2 to be in the value range.
2. The design method according to claim 1,
when the arrangement pattern is a straight line, the permanent magnet group comprises a first high-coercivity permanent magnet (11), a first low-coercivity permanent magnet (12) and a second low-coercivity permanent magnet (13), wherein the first low-coercivity permanent magnet (12) and the second low-coercivity permanent magnet (13) are respectively arranged at two ends of the length of the first high-coercivity permanent magnet (11), the length of the first high-coercivity permanent magnet (11) is H1, the lengths of the first low-coercivity permanent magnet (12) and the second low-coercivity permanent magnet (13) are equal and are both H2, and H1 and H2 are adjusted according to the following method:
when Wq is more than or equal to Wd, (2H2+ H1)/H1 is E1/E2 is more than or equal to 3;
when 0.6Wd ≦ Wq < Wd, 2 ≦ (2H2+ H1)/H1 ≦ E1/E2 < 3;
when 0.1Wd is less than or equal to Wq<At the time of 0.6Wd,
when Wq is<At the time of 0.1Wd,
3. the design method according to claim 1,
when the arrangement pattern is a straight line, a second high-coercivity permanent magnet (21), a third high-coercivity permanent magnet (22) and a third low-coercivity permanent magnet (23) are included in the permanent magnet group, wherein the second high-coercivity permanent magnet (21) and the third high-coercivity permanent magnet (22) are respectively arranged at two ends of the length of the third low-coercivity permanent magnet (23), the length of the third low-coercivity permanent magnet (23) is H3, the lengths of the second high-coercivity permanent magnet (21) and the third high-coercivity permanent magnet (22) are equal and are both H4, and H3 and H4 are adjusted according to the following method:
when Wq is more than or equal to Wd, (2H3+ H4)/2H3 is E1/E2 is more than or equal to 3;
when 0.6Wd ≦ Wq < Wd, 2 ≦ (2H3+ H4)/2H3 ≦ E1/E2 < 3;
when 0.1Wd is less than or equal to Wq<At the time of 0.6Wd,
when Wq is<At the time of 0.1Wd,
4. the design method according to claim 1,
the third low coercive force permanent magnet (23) is smaller in magnetization thickness than the second high coercive force permanent magnet (21) and the third high coercive force permanent magnet (22).
5. The design method according to claim 1,
when the arrangement type is V-shaped, the permanent magnet group comprises a fourth high-coercivity permanent magnet (32) and a fourth low-coercivity permanent magnet (33) which are positioned in a first magnetic steel groove (31), a fifth low-coercivity permanent magnet (35) and a fifth high-coercivity permanent magnet (36) which are positioned in a second magnetic steel groove (34), wherein the first magnetic steel groove (31) and the second magnetic steel groove (34) are arranged in a V shape, the fourth low-coercivity permanent magnet (33) is positioned at the core-near end of the fourth high-coercivity permanent magnet (32), the fifth low-coercivity permanent magnet (35) is positioned at the core-near end of the fifth high-coercivity permanent magnet (36), the lengths of the fourth high-coercivity permanent magnet (32) and the fifth high-coercivity permanent magnet (36) are equal and are both H5, the lengths of the fourth low-coercivity permanent magnet (33) and the fifth low-coercivity permanent magnet (35) are both equal and are both H6, the H5 and H6 were adjusted according to the following:
when Wq is greater than or equal to Wd,
when 0.6Wd is less than or equal to Wq<When the number of the channels is Wd,
when 0.1Wd is less than or equal to Wq<At the time of 0.6Wd,
when Wq is<At the time of 0.1Wd,
6. the design method according to claim 5,
the fourth low coercive force permanent magnet (33) has a larger magnetization thickness than the fourth high coercive force permanent magnet (32) and the fifth high coercive force permanent magnet (36), and the fifth low coercive force permanent magnet (35) has a larger magnetization thickness than the fourth high coercive force permanent magnet (32) and the fifth high coercive force permanent magnet (36).
7. The design method according to claim 1,
when the arrangement type is W-shaped, the permanent magnet group comprises a sixth high-coercivity permanent magnet (42) in a third magnetic steel groove (41), a sixth low-coercivity permanent magnet (44) in a fourth magnetic steel groove (43), a seventh low-coercivity permanent magnet (46) in a fifth magnetic steel groove (45), and a seventh high-coercivity permanent magnet (48) in a sixth magnetic steel groove (47), the third magnetic steel groove (41), the fourth magnetic steel groove (43), the fifth magnetic steel groove (45), and the sixth magnetic steel groove (47) are sequentially arranged in a W shape along the clockwise direction of the corresponding rotor core, the sixth high-coercivity permanent magnet (42) and the seventh high-coercivity permanent magnet (48) are equal in length and are all H7, and the sixth low-coercivity permanent magnet (44) and the seventh low-coercivity permanent magnet (46) are equal in length and are all H8, the H7 and H8 were adjusted according to the following:
when Wq is more than or equal to Wd, (H7+ H8)/H7 is E1/E2 is more than or equal to 3;
when 0.6Wd ≦ Wq < Wd, 2 ≦ (H7+ H8)/H7 ≦ E1/E2 < 3;
when 0.1Wd is less than or equal to Wq<At the time of 0.6Wd,
when Wq is<At the time of 0.1Wd,
8. the design method according to claim 1,
10V≤E2≤80V。
9. an electric machine rotor, characterized in that the electric machine rotor is designed and manufactured by the design method of the electric machine rotor according to any one of claims 1 to 8.
10. A double-winding electrical machine, characterized in that it comprises an electrical machine rotor according to claim 9.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10271722A (en) * | 1997-03-21 | 1998-10-09 | Matsushita Electric Ind Co Ltd | Permanent magnet buried rotor |
| CN105811616A (en) * | 2016-03-23 | 2016-07-27 | 创驱（上海）新能源科技有限公司 | Tangential sectional type magnetic steel and permanent magnet synchronous motor rotor equipped with same |
| WO2016179841A1 (en) * | 2015-05-14 | 2016-11-17 | 广东美芝制冷设备有限公司 | Rotor of rotary motor, permanent magnet motor, compressor and air-conditioning system |
| CN108076676A (en) * | 2016-09-16 | 2018-05-25 | 株式会社东芝 | Electric rotating machine and vehicle |
| CN209516769U (en) * | 2019-03-12 | 2019-10-18 | 南昌海立电器有限公司 | Rotor and motor |
-
2021
- 2021-06-28 CN CN202110720974.7A patent/CN113410933B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10271722A (en) * | 1997-03-21 | 1998-10-09 | Matsushita Electric Ind Co Ltd | Permanent magnet buried rotor |
| WO2016179841A1 (en) * | 2015-05-14 | 2016-11-17 | 广东美芝制冷设备有限公司 | Rotor of rotary motor, permanent magnet motor, compressor and air-conditioning system |
| CN105811616A (en) * | 2016-03-23 | 2016-07-27 | 创驱（上海）新能源科技有限公司 | Tangential sectional type magnetic steel and permanent magnet synchronous motor rotor equipped with same |
| CN108076676A (en) * | 2016-09-16 | 2018-05-25 | 株式会社东芝 | Electric rotating machine and vehicle |
| CN209516769U (en) * | 2019-03-12 | 2019-10-18 | 南昌海立电器有限公司 | Rotor and motor |
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