CN113328543A - High-grade permanent magnet motor with multilayer winding structure - Google Patents
High-grade permanent magnet motor with multilayer winding structure Download PDFInfo
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- 238000004804 winding Methods 0.000 title claims abstract description 276
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 43
- 239000010959 steel Substances 0.000 claims abstract description 43
- 230000008878 coupling Effects 0.000 claims abstract description 7
- 238000010168 coupling process Methods 0.000 claims abstract description 7
- 238000005859 coupling reaction Methods 0.000 claims abstract description 7
- 230000004907 flux Effects 0.000 abstract description 7
- 230000003313 weakening effect Effects 0.000 abstract description 7
- 230000005389 magnetism Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 238000011161 development Methods 0.000 description 4
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/28—Layout of windings or of connections between windings
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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
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
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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
- 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 discloses a high-grade permanent magnet motor with a multilayer winding structure, which comprises a stator and a rotor which are installed into a whole in a magnetic coupling mode, wherein the number of winding slots in the stator is even, each two adjacent stator teeth adopt an (n +1) -n layered winding distribution structure, n is a positive integer larger than or equal to 1, the rotor comprises a plurality of permanent magnet steel pieces, the residual magnetism Br of the permanent magnet steel pieces is not less than 1.3T, and/or the coercive force HCj of the permanent magnet steel pieces is not less than 17 KOe; the invention realizes excellent flux weakening speed expansion capability of the motor product, makes up the disadvantage of fixed rotating speed of a single-wire winding motor, enables the motor product to flexibly meet different requirements at the subsequent application end through flux weakening speed expansion, and greatly improves the universality.
Description
Technical Field
The invention belongs to the field of motors, and particularly relates to a high-grade permanent magnet motor with a multilayer winding structure.
Background
In order to improve the slot filling rate of the motor, the applicant previously proposed a single-wire multilayer winding distribution structure (application numbers include 2021102473353 and 2021204884420) of the motor, and specifically proposed a scheme that each phase winding adopts a winding basic unit (referred to as a "single-wire multilayer winding structure" for short) of a single-wire multilayer (n 2-3 layers) distribution structure, so as to effectively improve the driving efficiency level of the motor. With the application of the deep development of the applicant, it is found that in order to adapt to the single-wire multilayer winding structure scheme, some problems exist in specific structural configuration, structural shape and specification size, and specifically include: the motor adopting the multilayer winding distribution structure has the defects that the rotating speed cannot be flexibly adjusted, and the universality is not wide; for stators with different winding slot numbers, better electromagnetic working effect can be realized only by how to arrange the pole number of the rotor, and the conventional winding slot/pole number configuration is difficult to meet good motor driving performance all the time; and the winding slot structure cannot be well adapted to the multilayer winding structure.
Based on the applicant's research experience in the field for years and the deep development research in the development direction of single-line multi-layer (n 2-3 layers) distribution structures, the applicant hopes to seek technical solutions to improve the above technical problems respectively.
Disclosure of Invention
In view of the above, the present invention provides a high-grade permanent magnet motor with a multilayer winding structure, which realizes excellent flux weakening and speed expansion capabilities for motor products, makes up for the disadvantage of fixed rotation speed of a single-wire winding motor, and enables the motor products to flexibly meet different requirements at subsequent application ends through flux weakening and speed expansion, thereby greatly improving universality.
The technical scheme of the invention is as follows:
a high-grade permanent magnet motor with a multilayer winding structure comprises a stator and a rotor which are installed into a whole in a magnetic coupling mode, the number of winding slots in the stator is even, every two adjacent stator teeth adopt an (n +1) layer-n layer type winding distribution structure, n is a positive integer larger than or equal to 1, the rotor comprises a plurality of permanent magnet steel, the remanence Br of the permanent magnet steel is not smaller than 1.3T, and/or the coercive force HCj of the permanent magnet steel is not smaller than 17 KOe.
Preferably, the remanence Br of the permanent magnetic steel is not less than 1.4T.
Preferably, the remanence Br of the permanent magnetic steel is 1.48T.
Preferably, the thickness range of the permanent magnetic steel is 1.5-2.3 mm.
Preferably, n-1, n-2 or n-3.
Preferably, n is 2, and the winding slot fullness rate of the motor stator is not lower than 70%.
Preferably, the span factor of the electric machine is 1; wherein n is a positive integer more than or equal to 1, and the span coefficient is the positive integer which is the same as or closest to the ratio of the number of winding slots to the number of poles; the motor is composed of 1 or a plurality of motor basic units, each motor basic unit realizes driving operation by adopting an independent control signal, wherein no angular difference exists between the motor basic units, and the number of winding slots and the number of pole pairs in a single motor basic unit are relatively prime integers.
Preferably, the n +1 layer type winding in the motor is obtained by winding a single winding wire on the stator teeth corresponding to the single winding wire, and the n layer type winding in the motor is obtained by winding a single winding wire on the stator teeth corresponding to the single winding wire; and the winding connection target is used for electrically connecting the winding breakpoints to form a plurality of winding connection points.
Preferably, a winding slot for winding a winding wire is formed between adjacent stator teeth, and an insulating layer is arranged between the winding slot and the winding wire; the relationship between the slot opening width Bs0 of the winding slot and the wire diameter Da of the winding wire is as follows: 2 Da is less than or equal to Bs0 is less than or equal to 2.5 Da.
Preferably, the second slot width Bs2 of the winding slot closest to the stator yoke is no greater than its first slot width Bs1 furthest from the stator yoke; the second slot width Bs2 ═ a × Da +2 × Ta + Tb; a is the number of winding layers in the winding slots, Ta is the thickness of the insulating layer, and Tb is the distance between the winding layers in the same winding slot and wound on the adjacent stator teeth.
The 17KOe referred to in this application is 17000Oe (Oersted); the remanence Br is given in units of T (Tesla).
When n is 2 in the application, namely a 3-2 layer winding distribution structure is adopted, the winding slot filling rate of the motor stator can reach more than 75%, and the conventional motor stator adopting a multi-wire or single-wire winding can only achieve 50-60% of the slot filling rate winding; under the condition that the winding wire amount (the sum of the sectional areas of the winding wires of each slot) for each winding slot is the same, the slot area of the single-wire winding motor stator applying the 3-layer-2-layer type winding distribution structure is reduced by about 20 percent compared with the conventional motor stator of a multi-wire or single-wire winding; correspondingly, the area change of the corresponding stator tooth part is just opposite, and compared with the conventional multi-wire or single-wire winding motor stator with a 3-layer-2-layer winding distribution structure, the slot area of the stator tooth part is increased by about 20 percent;
therefore, under the condition that the magnetic steel volume or the magnetic energy product of the rotor is the same, the magnetic density amplitude of the stator tooth part of the motor provided by the application is greatly different from that of a conventional motor stator, and particularly, the magnetic density of the stator tooth part of a single-wire winding motor applying an (n +1) layer-n layer type winding distribution structure is lower than that of the fixed tooth part of the conventional motor. The applicant considers that a single-wire winding motor applying an (n +1) layer-n layer type winding distribution structure has to enable the magnetic density of a stator tooth part of the motor to meet the actual use requirement by increasing the magnetic energy product of the motor, and the magnetic energy product of the motor can be increased by increasing the volume of magnetic steel generally; however, due to the limitation of increasing the volume of the magnetic steel: 1. under the condition that the volume of the motor is not changed, the space is limited and no redundant space position exists. 2. When the size of the motor is not limited, the size of the magnetic steel can be increased only by increasing the thickness of the magnetic steel for the motor with the same turning radius. Therefore, the direct-axis magnetic resistance of the motor can also increase along with the thickness of the magnetic steel, the direct-axis inductance of the motor winding can decrease along with the increase of the direct-axis magnetic resistance, and the change of the direct-axis inductance directly influences the flux weakening and speed expanding capacity of the motor; finally, the direct-axis inductance is increased, the weak magnetic energy capacity of the motor is enhanced, the direct-axis inductance is reduced, and the weak magnetic energy capacity of the motor is weakened, so that the applicant does not suggest to adopt a scheme of increasing the volume of the magnetic steel to increase the magnetic energy product of the motor.
Therefore, the application creatively provides that the magnetic energy product is increased through the application of high-grade magnetic steel without being restricted by space size, and through practical verification, the effect of increasing the magnetic energy product of the motor can be achieved, and the volume can be smaller than that of the conventional magnetic steel; when the motor with the same turning radius is adopted, the thickness of the magnetic steel can be obviously reduced: the thickness of the magnetic steel is reduced, the direct-axis magnetic resistance is reduced, the direct-axis inductance of the motor winding can be increased along with the reduction of the direct-axis magnetic resistance, the weak magnetic capacity of the motor is enhanced by the increase of the direct-axis inductance, and the energy loss of the motor in high-power weak magnetic can be greatly reduced;
in addition, the winding slots of the single-wire winding motor adopting the (n +1) layer-n layer type winding distribution structure are designed according to the slot filling rate and the winding specification, and the winding specification is not adjustable after the motor product is shaped, so that the rotating speed of each overlapping thickness motor is fixed, which has negative influence on the practical application angle of the product; the motor stator with the (n +1) layer-n layer type winding distribution structure and the rotor with the high-grade permanent magnet steel are combined, so that excellent weak magnetic speed expansion capacity of a motor product is realized, the defect of fixed rotating speed of a single-wire winding motor is overcome, the motor product can flexibly meet different requirements at a subsequent application end through weak magnetic speed expansion, and the universality is greatly improved.
The single-wire winding in the single-wire winding motor is formed by winding a plurality of layers on the stator teeth through the single-wire winding.
Aiming at a single-wire winding motor scheme applying an (n +1) layer-n layer type winding distribution structure, the application also provides the following preferable scheme:
the application further provides that the span coefficient of the motor is equal to 1; the span coefficient is a positive integer which is the same as or closest to the ratio of the number of winding slots to the number of poles; through the structural design of the motor with the span coefficient selected as 1, the magnetic coupling driving working effect of the motor can be obviously improved, and the driving performance level of the motor is further improved;
the present application further proposes a relationship between the slot width Bs0 of the winding slot and the wire diameter Da of the winding wire (typically enamelled copper wire): the Bs0 is not less than 2 & ltDa & gt and not more than 2.5 & ltDa & gt, on the basis of ensuring the arrangement of the multilayer single-wire winding structure in the winding slot, the protection and insulation effects on the multilayer winding structure in the winding slot are facilitated, and the service life of the motor is prolonged;
this application has still further provided and has broken off the part n +1 laminar winding and the part n laminar winding that lie in same one side and form a plurality of winding breakpoints, carries out the electricity according to winding wiring target to each winding breakpoint and connects and form a plurality of winding tie points, need do loaded down with trivial details structure when avoiding adopting multilayer single line winding to work a telephone switchboard and wind the electric connection effect of establishing between the realization polyphase winding, has obviously simplified the wiring structure, is showing and has promoted wiring efficiency.
Drawings
FIG. 1 is a diagram showing the state change of a motor winding in the case of multi-break connection in embodiment 1 of the present application; wherein, fig. 1(a) represents a winding unwinding schematic diagram of a single winding wire completing an (n +1) layer-n layer type winding distribution knot; FIG. 1(b) represents a winding unwinding schematic for setting the winding break point position; FIG. 1(c) represents a schematic winding unwinding after completion of winding breaking; FIG. 1(d) is a schematic view of the unwinding of the windings to complete the electrical connection of the winding breaks; FIG. 1(e) represents a schematic diagram of the development of a three-phase winding using a star connection;
fig. 2 is a schematic diagram of the distribution structure of the motor winding in the winding slot in embodiment 1 of the present application;
fig. 3 is a schematic structural diagram of a stator of the motor in embodiment 1 of the present application (windings are not shown);
FIG. 4 is an enlarged view of the structure of FIG. 3 at A;
FIG. 5 is an enlarged view of the structure of FIG. 3 at B (with the windings shown);
fig. 6 is a graph showing the operation of the motor in embodiment 2 of the present application.
Detailed Description
The embodiment of the invention discloses a high-grade permanent magnet motor with a multilayer winding structure, which comprises a stator and a rotor which are installed into a whole in a magnetic coupling mode, wherein the number of winding slots in the stator is even, every two adjacent stator teeth adopt a (n +1) -n layered winding distribution structure, n is a positive integer larger than or equal to 1, the rotor comprises a plurality of permanent magnet steel, the residual magnetism Br of the permanent magnet steel is not smaller than 1.3T, and/or the coercive force HCj of the permanent magnet steel is not smaller than 17 KOe.
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1: a high-grade permanent magnet motor with a multilayer winding structure comprises a stator and a rotor which are installed into a whole in a magnetic coupling mode, the number of winding slots in the stator is even, every two adjacent stator teeth adopt an (n +1) layer-n layer type winding distribution structure, n is a positive integer larger than or equal to 1, the rotor comprises a plurality of permanent magnet steel, the remanence Br of the permanent magnet steel is not smaller than 1.3T, and/or the coercive force HCj of the permanent magnet steel is not smaller than 17 KOe; further preferably, the residual magnetism Br of the permanent magnet steel is not less than 1.4T; the thickness range of the permanent magnetic steel is 1.5-2.3 mm; specifically, preferably, in the embodiment, the remanence Br of the permanent magnet steel is 1.48T, the permanent magnet steel with the trademark of 56H provided by the gold-force permanent magnet is specifically selected, and compared with the permanent magnet steel with the trademark of 38H adopted by the conventional motor, the thickness of the permanent magnet steel is reduced by about 32%, and the volume of the permanent magnet steel is only about 68% of that of the permanent magnet steel with the trademark of 38H;
preferably, in the present embodiment, n-1 or n-2 or n-3; preferably, in the present embodiment, n is 2, the winding slot fullness of the stator of the motor is not lower than 70%, and the distribution structure of the motor winding in the winding slot 12 shown in fig. 2 can be specifically referred to; naturally, the setting of the value n may also be selected according to actual needs, and this embodiment does not make a particular limitation, and adaptive changes may also be made with reference to the preferred winding slots proposed in embodiment 2 and the multi-break connection structure scheme of the motor winding proposed in embodiment 1, and in combination with common knowledge, and these equivalent changed embodiments all belong to the protection scope of the present application;
preferably, in the present embodiment, the span coefficient of the electric machine is 1; the span coefficient is a positive integer which is the same as or closest to the ratio of the number of winding slots to the number of poles; further preferably, in this embodiment, the motor is an outer rotor permanent magnet brushless motor, and is composed of 1 or more motor basic units, and each motor basic unit realizes driving operation by using an independent control signal, where there is no angular difference between each motor basic unit, and the number of winding slots and the number of pole pairs in a single motor basic unit are relatively prime integers; the number of winding slots in a single motor basic unit is even or odd; through practical verification, compared with a motor adopting other span coefficients, when the span coefficient is 1, the electromagnetic working efficiency can be further improved, and the driving performance level of the motor is improved; when the number of winding slots in a single motor basic unit and the number of pole pairs adopt a mutual prime integer relation, the electromagnetic working efficiency of the motor can be further improved;
particularly preferably, in the present embodiment, when the motor employs 5 pairs of pole 12 winding slots, a single motor base unit is directly employed; when the motor adopts 14-pair-pole 24-winding slots, the motor basic unit can comprise 2 7-pair-pole 12-winding slots; when the motor adopts 22-antipole 48 winding slots, the motor basic unit can comprise 2 motor basic units with 11-antipole 24 winding slots; when the motor adopts 26 pairs of poles and 48 winding slots, the motor basic unit can comprise 2 motor basic units with 13 pairs of poles and 24 winding slots; when the motor adopts 4 pairs of 12-pole winding slots, the motor basic unit can comprise 41 pair of 3-pole winding slots; when the motor adopts 16-pair-pole 36-winding slots, the motor basic unit can comprise 4-pair-pole 9-winding slots; when the motor adopts 40 pairs of 72 winding slots, the motor basic unit can comprise 8 5 pairs of 9 winding slots; when the motor adopts 30 pairs of 54-pole winding slots, the motor basic unit can comprise 6 5 pairs of 9-pole winding slots; in the embodiment, the span coefficient is selected to be 1, and the motor structure design that the number of winding slots and the number of pole pairs in a single motor basic unit are in a mutual prime integer relationship is combined, so that the magnetic coupling driving working effect of the motor can be obviously improved, and the driving performance level of the motor is further improved;
preferably, in the present embodiment, in the 3-layer-2-layer winding distribution structure, the 3-layer winding in the motor is obtained by winding the stator teeth corresponding to the 3-layer winding with a single winding wire, and the 2-layer winding in the motor is obtained by winding the stator teeth corresponding to the 2-layer winding with a single winding wire; the number of effective winding turns of the 1 st layer of winding on the stator teeth is the largest, and the number of effective winding turns of the uppermost layer of winding on the stator teeth is the smallest, so that the single-wire winding operation is facilitated; with further reference to the distribution structure of the motor windings in the winding slots shown in fig. 2, a 3-layer winding 1 (specifically including a 1 st layer winding 1a, a 2 nd layer winding 1b, and a 3 rd layer winding 1c) and a 2-layer winding 2 (specifically including a 1 st layer winding 2a and a 2 nd layer winding 2b) are respectively wound on each two adjacent stator teeth, wherein the effective winding number of the 2 nd layer winding 1b is smaller than that of the 1 st layer winding 1a and is greater than that of the 3 rd layer winding 1 c; the effective winding turns of the 2 nd layer winding 2b are less than the effective winding turns of the 1 st layer winding 2 a; particularly preferably, the difference value of the effective winding turns between every two adjacent layers can be 1, which can obviously facilitate the space operation convenience when the single-wire multi-layer winding is carried out in the winding slot 12; specifically, in the present embodiment, when the stator teeth 11 are wound by a single wire, the winding of the 1 st layer starts from the winding slot bottom 12a and ends at the winding slot opening 12b, and the winding of the 2 nd layer starts from the winding slot opening 12b and ends at the winding slot bottom 12 a; according to the sequence, the single wire winding of the preset winding layer number is completed;
preferably, in this embodiment, this embodiment further provides a multi-break connection structure for a motor winding, in which a part 3 layer winding and a part 2 layer winding located on the same side are disconnected by a wire-cutting tool (the specific form of the wire-cutting tool is not limited, as long as the cutting effect on the winding can be achieved) to form a plurality of winding breakpoints, and the winding breakpoints are electrically connected according to a winding wiring target to form a plurality of winding connection points;
further preferably, in the present embodiment, the motor winding is a three-phase winding, the number of winding slots of each phase of winding in the stator is 2a, and each phase of winding adopts b winding basic units with a 3-2 layer distribution structure, where a is a positive integer no less than 1, b is a positive integer no less than 1, and a/b is a positive integer no less than 1; the input section and the output end of each phase winding are electrically connected through an additional winding connecting wire; the three-phase winding adopts a triangular connection method or a star connection method; specifically, in the present embodiment, please refer to fig. 1(a), the motor employs 14 antipodal 24 winding slots, the number of the stator teeth 11 is 24, 3 layer windings 1 and 2 layer windings 2 are respectively wound on each adjacent stator tooth 11 through an enameled copper wire, the number of the winding slots 12 of each phase winding in the stator is 8, and each phase winding employs 2 winding basic units of a 3-layer-2-layer-3-layer-2 layer distribution structure; referring to fig. 1(b) and fig. 1(c), at least 13 layer winding and at least 12 layer winding (10 positions, specifically including break point 1, break point 2, break point 3, break point 4, break point 5, break point 6, break point 7, break point 8, break point 9 and break point 10 marked in fig. 1 (b)) of each winding basic unit are disconnected, so as to form 20 winding break points shown in fig. 1 (c); referring to fig. 1(d) and fig. 1(e), the three-phase windings are connected in a star-like manner, and the input section and the output end of each phase winding are electrically connected through an additional winding 3 connecting line to form 15 winding connecting points, specifically including a connecting point 1, a connecting point 2, a connecting point 3, a connecting point 4, a connecting point 5, a connecting point 6, a connecting point 7, a connecting point 8, a connecting point 9, a connecting point 10, a connecting point 11, a connecting point 12, a connecting point 13, a connecting point 14 and a connecting point 15 marked in fig. (d), so that three-phase (specifically including a phase, B phase and C phase) windings of a motor stator with 24 winding slots are efficiently and quickly connected, and the input section and the output end (X1, Y1, Z1, and X2, Y2, Z2) of each phase winding are electrically connected in a star-like manner through an additional winding 3 connecting line; the electric connection effect between the multi-phase windings is achieved by winding a complex structure when the multilayer single-wire winding is used for wiring is avoided, the wiring structure is obviously simplified, and the wiring efficiency is obviously improved.
It should be noted that, the high-grade permanent magnet motor provided by the present application is not limited to be applied in the field of electric vehicles, but can also be applied in the field of products with similar driving performance requirements, and the present application is not particularly limited in implementation.
Example 2: the remaining technical solutions of this embodiment 2 are the same as those of the above embodiment 1, except that this embodiment 2 proposes a preferred winding slot 40 structure, in this embodiment, please refer to fig. 3, a 22-antipole 48 winding slot is adopted for the motor, and the motor stator 4 includes a stator core 40 having 48 stator teeth 41; 48 winding slots 43 for winding wires are formed between adjacent stator teeth 41, an insulating layer 5 is arranged between the winding slots 43 and the winding wires (including the 3-layer winding 1 and the 2-layer winding 2), and the insulating layer 5 can specifically adopt insulating slot paper or a similar insulating structure;
as shown in fig. 4 and 5, in the present embodiment, the relationship between the slot width Bs0 of the winding slot 43 and the wire diameter Da of the winding wire is: 2 Da is less than or equal to Bs0 is less than or equal to 2.5 Da; preferably, in the embodiment, the winding wire is an enameled copper wire, and the wire diameter Da of the enameled copper wire ranges from 0.7 mm to 1.3 mm; the second slot width Bs2 of the winding slot 43 closest to the stator yoke 42 is not greater than its first slot width Bs1 furthest from the stator yoke 42; a second slot width Bs2 ═ a × Da +2 × Ta + Tb; wherein, a is the number of winding layers in the winding slot 43, Ta is the thickness of the insulating layer 5, and Tb is the distance between the winding layers in the same winding slot 43 and wound on the adjacent stator teeth 41; in the present embodiment, a ═ 5(2n +1, where n ═ 2); ta in the range of 0.2-0.3 mm; tb ranges from 0.5 to 0.8 Da; the stator teeth 41 comprise tooth end parts 41a which are positioned at the end parts and extend towards the two sides of the end parts, the tooth end parts 41a and the corresponding stator teeth 41 have a spacing Hs1, the range of the tooth end parts Hs0 is 0.8-1.8mm, and the range of the spacing Hs1 is 0.2-1 mm; hs2 +0.5 mm; wherein Z is the effective winding number of the inner 1 st layer winding 1a on a single stator tooth 41; specifically, in the present embodiment, Z is 13.
In this embodiment 2, on the basis of ensuring the arrangement of the multilayer single-wire winding structure in the winding slot 43, the protection and insulation effects on the multilayer winding (including the 3-layer winding 1 and the 2-layer winding 2) structure in the winding slot 43 are facilitated, and the service life of the motor is prolonged.
Referring to fig. 6, the present embodiment 2 proposes an operation curve of a 22-antipole 48-winding slot motor, which has excellent performance in both torque and operating efficiency; the specific operating parameter behavior of this operating curve can be further seen in table 1 below:
TABLE 1 specific operating parameters for the operating curves shown in FIG. 6
Thereby it can be further verified: in the embodiment, the motor stator with the 3-layer-2-layer winding distribution structure and the rotor with the high-grade permanent magnet steel are combined, so that the excellent flux weakening speed expansion capability of the motor product is realized, the disadvantage of fixed rotating speed of a single-wire winding motor is overcome, the motor product can flexibly meet different requirements at subsequent application ends through flux weakening speed expansion, and the universality is greatly improved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A high-grade permanent magnet motor with a multilayer winding structure comprises a stator and a rotor which are installed into a whole in a magnetic coupling mode, and is characterized in that the number of winding slots in the stator is even, every two adjacent stator teeth adopt an (n +1) layer-n layer type winding distribution structure, n is a positive integer larger than or equal to 1, the rotor comprises a plurality of permanent magnet steel, the remanence Br of the permanent magnet steel is not smaller than 1.3T, and/or the coercive force HCj of the permanent magnet steel is not smaller than 17 KOe.
2. A high-grade permanent magnet electric machine according to claim 1, wherein the remanence Br of the permanent magnet steels is not less than 1.4T.
3. A high-grade permanent magnet electric machine according to claim 1, wherein the remanence Br of the permanent magnet steels is 1.48T.
4. A high-grade permanent magnet electric machine according to claim 1, wherein the thickness of the permanent magnet steel is in the range of 1.5-2.3 mm.
5. A high-grade permanent magnet electric machine according to claim 1, wherein n-1, n-2, or n-3.
6. A high-grade permanent magnet electric machine according to claim 1, wherein said n-2, and the winding slot fill ratio of the machine stator is not less than 70%.
7. A high-grade permanent magnet electric machine according to claim 1, wherein the span factor of the machine is 1; wherein n is a positive integer more than or equal to 1, and the span coefficient is the positive integer which is the same as or closest to the ratio of the number of winding slots to the number of poles; the motor is composed of 1 or a plurality of motor basic units, each motor basic unit realizes driving operation by adopting an independent control signal, wherein no angular difference exists between the motor basic units, and the number of winding slots and the number of pole pairs in a single motor basic unit are relatively prime integers.
8. The high-grade permanent magnet motor according to claim 1, wherein the n +1 layer type winding in the motor is obtained by winding a single winding wire on the stator teeth corresponding to the single winding wire, and the n layer type winding in the motor is obtained by winding a single winding wire on the stator teeth corresponding to the single winding wire; and the winding connection target is used for electrically connecting the winding breakpoints to form a plurality of winding connection points.
9. The high-grade permanent magnet motor according to claim 1, wherein winding slots for winding wires are formed between adjacent stator teeth, and an insulating layer is arranged between the winding slots and the winding wires; the relationship between the slot opening width Bs0 of the winding slot and the wire diameter Da of the winding wire is as follows: 2 Da is less than or equal to Bs0 is less than or equal to 2.5 Da.
10. A high-grade permanent magnet electric machine according to claim 9, wherein the second slot width Bs2 of the winding slot closest to the stator yoke is no greater than its first slot width Bs1 furthest from the stator yoke; the second slot width Bs2 ═ a × Da +2 × Ta + Tb; a is the number of winding layers in the winding slots, Ta is the thickness of the insulating layer, and Tb is the distance between the winding layers in the same winding slot and wound on the adjacent stator teeth.
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| CN202110681900.7A CN113328543A (en) | 2021-06-19 | 2021-06-19 | High-grade permanent magnet motor with multilayer winding structure |
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| CN202110681900.7A CN113328543A (en) | 2021-06-19 | 2021-06-19 | High-grade permanent magnet motor with multilayer winding structure |
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