CN110875643A - Synchronous motor and compressor - Google Patents
Synchronous motor and compressor Download PDFInfo
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- CN110875643A CN110875643A CN201811003910.XA CN201811003910A CN110875643A CN 110875643 A CN110875643 A CN 110875643A CN 201811003910 A CN201811003910 A CN 201811003910A CN 110875643 A CN110875643 A CN 110875643A
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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
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
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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
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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
Abstract
The invention provides a synchronous motor and a compressor, wherein the synchronous motor comprises: the rotor iron core comprises a rotor punching sheet and a slot, and a magnet is arranged in the slot; the stator core comprises an annular magnetic yoke and a plurality of convex teeth which are distributed at intervals along the circumferential direction of the central line of the annular magnetic yoke, the plurality of convex teeth comprise a plurality of tooth groups, each tooth group comprises a first tooth and a second tooth which are sequentially arranged along the rotation direction of the rotor core, the first tooth and the second tooth are wound with magnet exciting coils in the same phase, and any two adjacent tooth groups are wound with magnet exciting coils in different phases; the horizontal cross-sectional area of the tooth shoe of the first tooth is not equal to the horizontal cross-sectional area of the tooth shoe of the second tooth. The horizontal cross-sectional area of the tooth shoe of the first tooth is set to be unequal to that of the tooth shoe of the second tooth, so that the magnetic fluxes at the positions of the first tooth and the second tooth are improved by adjusting the horizontal cross-sectional areas of the two tooth shoes, the back electromotive force is improved by optimizing a magnetic flux path, the copper consumption of a winding is reduced, and a high-output motor is realized.
Description
Technical Field
The invention relates to the technical field of compressors, in particular to a synchronous motor and a compressor.
Background
In the existing rotary direct-current frequency conversion compressor, in order to ensure the high efficiency of the motor, a permanent magnet built-in motor is generally adopted, each coil of a stator winding is wound on a stator tooth, and the number of magnetic poles of a magnet matched with a rotor core and the number of stator slots are 2 under the general condition: 3, the stator teeth and the rotor magnetic poles are distributed on the circumference at equal intervals. The disadvantage of this motor structure is the short distance of the coils, which results in a low winding factor, due to the flux linkage between the flux generated by the permanent magnets and the stator windings, which is a relatively high number of inactive linkages. When the near-pole slot matching is adopted, the copper consumption of the motor can be effectively reduced due to the further improvement of the winding coefficient, but the matching of the motor pole slot used on the compressor is close to the limit, and a bottleneck exists in the technology how to further improve the energy efficiency on the basis.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, one aspect of the invention proposes a synchronous machine.
Another aspect of the present invention provides a compressor.
In view of the above, according to an aspect of the present invention, there is provided a synchronous motor including: the rotor core comprises a rotor punching sheet and a slot, and a magnet is arranged in the slot; the stator core comprises an annular magnetic yoke and a plurality of convex teeth which are distributed at intervals along the circumferential direction of the central line of the annular magnetic yoke, the plurality of convex teeth comprise a plurality of tooth groups, each tooth group comprises a first tooth and a second tooth which are sequentially arranged along the rotating direction of the rotor core, the same-phase magnet exciting coils are wound on the first tooth and the second tooth, and any two adjacent tooth groups are wound with magnet exciting coils of different phases; wherein the horizontal cross-sectional area of the tooth shoe of the first tooth is not equal to the horizontal cross-sectional area of the tooth shoe of the second tooth.
The invention provides a synchronous motor, which comprises a rotor core and a stator core, wherein the rotor core is provided with a slot for inserting a magnet, the stator core comprises a plurality of convex teeth which are circumferentially distributed at intervals on the inner side of an annular magnet yoke, the plurality of convex teeth can be divided into a plurality of tooth groups, each tooth group is wound with an in-phase excitation coil, any two adjacent tooth groups are wound with excitation coils of different phases, a first convex tooth which is sequentially arranged in each tooth group along the rotation direction of the rotor core is taken as a first tooth, a second convex tooth which is sequentially arranged in each tooth group along the rotation direction of the rotor core is taken as a second tooth, the horizontal cross-sectional area of a tooth shoe of the first tooth is set to be unequal to the horizontal cross-sectional area of a tooth shoe of the second tooth, each convex tooth comprises a main body part and a tooth shoe, the tooth shoe is positioned at one end of the main body part close to the central line of the stator core, and the magnetic fluxes at the first tooth and the second tooth are, the back electromotive force is promoted by optimizing the magnetic flux path, so that the copper consumption of the winding is reduced, and the high-output motor is realized. Specifically, in contrast to the direction of rotation of the rotor of the synchronous motor, for two adjacent teeth constituting a phase, the magnetic density of the convex teeth at the positive side of the rotor rotation direction is larger than that of the convex teeth at the reverse side of the rotor rotation direction, which is equivalent to that the magnetic density at the second teeth is larger than that at the first teeth, the magnetic densities of adjacent two teeth constituting the same phase are not uniform, which causes a difference in the magnetic densities of respective teeth in an adjacent group of teeth in one phase of the synchronous motor, the horizontal cross-sectional area of the tooth shoe of the first tooth is smaller than that of the tooth shoe of the second tooth, so that the magnetic flux density saturation of the second tooth is reduced, the magnetic flux density of the convex tooth on the positive side of the rotation direction of the rotor is reduced, the uniform distribution of the magnetic flux density at each position is facilitated, a magnetic flux path sent by the magnet is optimized, and the magnetic flux at the position of the second tooth is increased, so that the counter potential is effectively improved, and the performance of the motor is improved.
In addition, according to the synchronous motor in the above technical solution provided by the present invention, the following additional technical features may also be provided:
in the above technical solution, preferably, the firstHorizontal cross-sectional area S of tooth shoe of toothT1Horizontal cross-sectional area S of tooth shoe with second toothT2The ratio of (A) to (B) satisfies: s is more than or equal to 0.7T1/ST2＜1。
In this solution, the horizontal cross-sectional area S of the tooth shoe of the first tooth is specifically definedT1Horizontal cross-sectional area S of tooth shoe with second toothT2Satisfies the following conditions: s is more than or equal to 0.7T1/ST2The magnetic density of each convex tooth can be ensured to be equivalent, and the problem that the magnetic density distribution at each position is extremely uneven to influence the performance of the motor due to the fact that the horizontal cross section area of the first tooth is too small compared with that of the second tooth is effectively avoided.
In any of the above solutions, preferably, the radial width W at the root of the tooth shoe of the first toothT1 is smaller than the radial width W at the root of the tooth shoe of the second toothT2。
In the technical scheme, the set convex teeth comprise a main body part and tooth shoes, the tooth shoes are positioned at one ends of the main body part, which are close to the central line of the stator core, a radius line of an annular magnetic yoke is drawn through points where the tooth shoes are connected with the main body part, and the length of the radius line extending on the tooth shoes is the radial width of the root parts of the tooth shoes. Since the magnetic density of the teeth on the side forward of the direction of rotation of the rotor is greater than the magnetic density of the teeth on the side reverse of the direction of rotation of the rotor for two adjacent teeth making up a phase, opposite to the direction of rotation of the rotor of the synchronous machine, the magnetic densities of two adjacent teeth making up a phase are not uniform, which makes the magnetic densities of each tooth in an adjacent set of teeth in a phase of the synchronous machine different by making the radial width W at the root of the tooth shoe of the first toothT1 is smaller than the radial width W at the root of the tooth shoe of the second toothTAnd 2, the magnetic density saturation of the second tooth is reduced, the magnetic density of the convex tooth on the positive side of the rotation direction of the rotor is reduced, the uniform distribution of the magnetic density at each position is facilitated, in addition, a magnetic flux path emitted by the magnet is optimized, and the magnetic flux at the second tooth is increased, so that the counter potential is effectively improved, and the performance of the motor is improved.
In the above-described aspect, preferably, the radial width W at the root of the tooth shoe of the first toothT1 and radial width W at the root of the tooth shoe of the second toothT2 satisfies the following conditions: w is more than or equal to 0.4T1/WT2＜1。
In this solution, the radial width W at the root of the tooth shoe of the first tooth is specifically definedT1 and radial width W at the root of the tooth shoe of the second toothT2 satisfies the following conditions: w is more than or equal to 0.4T1/WT2 < 1, can ensure that each convex tooth magnetic density is equivalent, effectively avoid the radial width undersize of the tooth boot root department of first tooth, and lead to the magnetic density distribution extremely uneven everywhere, influence the motor performance.
In any of the above technical solutions, preferably, the number of turns of the exciting coil wound on the first tooth is not equal to the number of turns of the exciting coil wound on the second tooth.
In the technical scheme, because in two adjacent convex teeth, the magnetic density of the convex teeth on the positive side of the rotor rotating direction is different from the magnetic density of the convex teeth on the reverse side of the rotor rotating direction, namely the magnetic densities of the two adjacent convex teeth in the same phase are not uniform, and then the number of turns of the magnet exciting coil wound on the first tooth is not equal to the number of turns of the magnet exciting coil wound on the second tooth, the magnetic density uniform distribution at each convex tooth is facilitated, the iron loss is reduced, and the motor performance is improved.
In any of the above technical solutions, preferably, the number of turns of the exciting coil wound on the first tooth is larger than that of the exciting coil wound on the second tooth.
In this technical scheme, the number of turns through setting up winding excitation coil on the first tooth is greater than the number of turns of winding excitation coil on the second tooth, can suitably increase the magnetic density of first tooth department, reduces the magnetic density of second tooth department, and it is even to be favorable to magnetism density everywhere, can effectively reduce the iron loss when promoting the back emf, promotes synchronous machine efficiency. Furthermore, the increase in the horizontal cross-sectional area of the tooth shoe of the second tooth, and/or the radial width W at the root of the tooth shoe of the second toothT2, the groove fullness rate of the slots corresponding to the two sides of the convex teeth can be increased, the number of turns of the excitation coil wound on the second tooth is reduced, the groove fullness rate is kept unchanged, and the problems of reduced manufacturability, difficult winding, easy damage of the excitation coil, high product reject ratio and the like caused by excessive increase of the groove fullness rate are avoided.
In any of the above solutions, preferably, the slot poles of the synchronous motor are matched to 10 slots 12 poles or 12 slots 14 poles.
In this embodiment, the slot pole of the synchronous motor is preferably matched with 10 slots 12 poles, or may be matched with 12 slots 14 poles, and the radial width W at the root of the tooth shoe of the first tooth is matchedT1 is smaller than the radial width W at the root of the tooth shoe of the second toothT2, the synchronous motor has higher winding coefficient, high back electromotive force and low copper consumption of the winding, and can realize a high-output and high-efficiency permanent magnet motor; in addition, the space in the groove can be increased, more copper wires are put in, copper consumption is reduced, and efficiency is further improved. Specifically, when the slot poles of the synchronous motor are matched into 12 slots and 14 poles, 4 teeth wound around the excitation coil of the same phase are divided into 2 tooth groups, each tooth group has 2 teeth, and two tooth groups of the same phase are symmetrically distributed along the center line of the annular magnetic yoke.
In any of the above aspects, preferably, a winding direction of the field coil on the first tooth is opposite to a winding direction of the field coil on the second tooth.
In this technical scheme, through setting for the winding direction of the excitation coil on the first tooth opposite with the winding direction of the excitation coil on the second tooth, make things convenient for the coiling on the one hand, on the other hand can reduce the length of excitation coil, practices thrift the cost, and is favorable to rotor core to rotate steadily.
In any of the above technical solutions, preferably, the magnets are permanent magnets, and the permanent magnets are distributed in a line shape or a V shape on any horizontal section of the rotor core, or the permanent magnets are tangentially magnetized magnets.
In the technical scheme, the permanent magnets are arranged in a straight line or V-shaped relative to any horizontal section of the rotor core or are tangentially magnetized magnets, and when the permanent magnets are arranged in a V-shaped or tangentially magnetized magnets, the magnetic concentration effect is good, the main flux is higher, the back electromotive force is high, and therefore the running efficiency of the motor is high. Of course, the permanent magnets may also be magnets of other shapes, such as a hybrid of radial and tangential configurations. Preferably, the permanent magnet is a rare earth magnet, a ferrite magnet, or a rare earth and ferrite mixed magnet.
In any of the above technical solutions, preferably, when the permanent magnets are distributed in a V shape, an included angle of the V shape ranges from 90 ° to 130 °.
In the technical scheme, the included angle of the permanent magnets distributed in a V shape is set to be 90-130 degrees, so that the back electromotive force fundamental wave maximization can be realized, the copper consumption of the winding is reduced, and the running efficiency of the motor is improved. The permanent magnets are distributed in a V shape, and can be one V-shaped permanent magnet or two permanent magnets forming a V shape.
In any of the above technical solutions, preferably, on any horizontal cross section of the rotor core, the sum of the lengths of the magnets under each pole is bm, the inner diameter of the stator core is Di, and the number of pole pairs on the rotor core is P, wherein bm × 2P/(pi × Di) is not less than 0.75 and not more than 0.9.
In the technical scheme, the sum of the lengths of the magnets under each pole on any horizontal section of the rotor core is set to be bm, for example, when each pole comprises two magnets, the sum of the lengths of the two magnets is bm, the inner diameter of the stator core is Di, the number of pole pairs on the rotor core is P, and the sum of the lengths of the two magnets is 0.75-0 bm multiplied by 2P/(pi multiplied by Di) and 0.9, so that the highest utilization rate and the optimal cost performance of the permanent magnet can be realized, and the running efficiency of the motor is improved.
In any of the above technical solutions, preferably, the central angle corresponding to the pole crown of the rotor of the synchronous motor is α 1, and the pole pitch angle is α 2, where α 1/α 2 is ≧ 0.5.
In the technical scheme, the central angle corresponding to each pole crown of the rotor of the synchronous motor is α 1, the pole pitch angle is α 2, wherein the pole crown is a part which is positioned at the periphery of a rotor core and has an arc outline, in other words, arcs on two sides of a d axis of a magnetic pole form a whole arc which takes a rotation center as a circle center, the central angle corresponding to the whole arc is α 1, α 1/α 2 is limited to be more than or equal to 0.5, sufficient main flux can be provided, the performance of the motor is improved, and the manufacturing requirement can be met.
In any of the above technical solutions, preferably, a ratio of the inner diameter Di of the stator core to the outer diameter Do thereof satisfies: Di/Do is more than or equal to 0.52 and less than or equal to 0.57.
In the technical scheme, the ratio of the inner diameter Di of the stator core to the outer diameter Do thereof is set to satisfy the following conditions: Di/Do is more than or equal to 0.52 and less than or equal to 0.57, so that the optimal cost performance can be obtained while the rotational inertia is met, and the production cost of the motor is reduced.
In any of the above technical solutions, preferably, the rated torque of the synchronous machine is T, the inner diameter of the stator core is Di, and the unit volume torque of the rotor of the synchronous machine is TPV, which satisfy: 5.18X 10-7≤T×Di-3×TPV-1≤1.17×10-6，5kN·m·m-3≤TPV≤45kN·m·m-3Wherein the rated torque T is expressed in the unit of N.m, the inner diameter Di is expressed in the unit of mm, and the unit volume torque TPV is expressed in the unit of kN.m.m-3。
In the technical scheme, the rated torque of the synchronous motor is T, the inner diameter of a stator core is Di, the unit volume torque of a rotor is TPV, and the requirements of 5.18 multiplied by 10 are met-7≤T×Di-3×TPV-1≤1.17×10-6Wherein the value range of the unit volume torque TPV is 5 kN.m.m-3≤TPV≤45kN·m·m-3The numerical range of the combined variable of the rated torque T of the motor, the inner diameter Di of the stator core and the unit volume torque TPV of the rotor is limited, so that the motor can meet the power requirement of the compressor, and in addition, the motor and the compressor adopting the rotor can effectively reduce the magnetic leakage of the rotor, increase the utilization rate of the permanent magnet and improve the efficiency of the motor.
Another aspect of the present invention provides a compressor, including: a synchronous machine according to any of the preceding claims.
The compressor provided by the invention has the advantages of any technical scheme due to the synchronous motor in any technical scheme, and therefore, the compressor is not repeated herein.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 shows a schematic partial top view of a stator core of an embodiment of the present invention;
fig. 2 shows a schematic partial top view of a stator core of another embodiment of the present invention;
fig. 3 is a diagram showing a comparison of the back electromotive force of the synchronous motor of one embodiment of the present invention with that of the synchronous motor in the related art;
FIG. 4 is a schematic view showing a magnetic flux density distribution at a first tooth and a second tooth in the related art;
FIG. 5 illustrates a schematic top view of a rotor core of an embodiment of the present invention;
FIG. 6 shows a schematic top view of a rotor core of another embodiment of the present invention;
FIG. 7 shows a schematic top view of a rotor core of yet another embodiment of the present invention;
fig. 8 is a schematic view showing a structure of a compressor according to an embodiment of the present invention;
wherein, the correspondence between the reference numbers and the part names in fig. 1 to 3 and 5 to 8 is:
1 synchronous motor, 10 stator core, 12 annular magnetic yoke, 14 convex teeth, 142 first teeth, 144 second teeth, 146 tooth shoes, 20 rotor core, 202 magnet, 2 compressor.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
The synchronous motor 1 and the compressor 2 according to some embodiments of the present invention are described below with reference to fig. 1 and 8.
As shown in fig. 1, an embodiment of an aspect of the present invention provides a synchronous machine 1, including: a rotor core 20 including a rotor punching sheet and a slot, in which a magnet is disposed; and a stator core 10 including an annular yoke 12 and a plurality of teeth 14 circumferentially spaced along a center line of the annular yoke 12, the plurality of teeth 14 including a plurality of tooth groups, each tooth group including a first tooth 142 and a second tooth 144 sequentially arranged along a rotation direction of the rotor core 20, the first tooth 142 and the second tooth 144 being wound with field coils of the same phase, and any two adjacent tooth groups being wound with field coils of different phases; wherein the horizontal cross-sectional area of the tooth shoe 146 of the first tooth 142 is not equal to the horizontal cross-sectional area of the tooth shoe 146 of the second tooth 144.
The synchronous motor 1 provided by the invention comprises a rotor core 20 and a stator core 10, wherein the rotor core 20 is provided with a slot for inserting a magnet, the stator core 10 comprises a plurality of convex teeth 14 which are circumferentially distributed at intervals on the inner side of an annular magnetic yoke 12, the plurality of convex teeth 14 can be divided into a plurality of tooth groups, each tooth group is wound with an excitation coil in the same phase, any two adjacent tooth groups are wound with excitation coils in different phases, the first convex tooth 14 which is sequentially arranged in the rotating direction of the rotor core 20 in each tooth group is taken as a first tooth 142, the horizontal cross-sectional area of a tooth shoe 146 of the first tooth 142 is set to be unequal to the horizontal cross-sectional area of a tooth shoe 146 of a second tooth 144, each convex tooth 14 comprises a main body part and a tooth 146, the tooth shoe 146 is positioned at one end of the main body part close to the central line of the stator core 10, and the magnetic flux at the positions of the first tooth shoe 142 and the second tooth 144 can be improved by, the horizontal cross-sectional area of the tooth shoe 146 of the first tooth 142 is preferably smaller than that of the tooth shoe 146 of the second tooth 144, so that the back electromotive force is improved by optimizing a magnetic flux path and optimizing the structural size of the motor, the magnetic densities of the two teeth can be designed to a certain degree, the magnetic resistance of a magnetic circuit is improved, the magnetic flux can pass more smoothly, and the back electromotive force is improved. Thereby reducing the copper consumption of the winding and realizing a high-output motor.
Specifically, referring to fig. 4, it can be seen that, in two adjacent teeth 14 constituting one phase, the magnetic density of the tooth 14 on the forward side of the rotor rotation direction is greater than the magnetic density of the tooth 14 on the reverse side of the rotor rotation direction, and particularly, when the tooth shoe size is the same, the magnetic density distribution of the two adjacent tooth shoes corresponding to one phase winding is very uneven, the average magnetic density of the tooth shoe of the tooth 14 on the reverse side of the rotor rotation direction is 1.37T, and the average magnetic density of the tooth shoe of the tooth 14 on the forward side of the rotor rotation direction is 1.42T, which are different by 4%, among the two adjacent tooth shoes 14 constituting one phase. According to the invention, the horizontal cross-sectional area of the tooth shoe 146 of the first tooth 142 is smaller than that of the tooth shoe 146 of the second tooth 144, so that the magnetic density saturation of the second tooth 144 is reduced, the magnetic density of the convex tooth 14 on the positive side of the rotor rotation direction is reduced, the uniform distribution of the magnetic densities at all positions is facilitated, the magnetic flux path emitted by the magnet is optimized, and the magnetic flux at the position of the second tooth 144 is increased, so that the counter potential is effectively improved, and the motor performance is improved. Specifically, referring to fig. 3, it can be seen that the X axis is the counter potential harmonic number, the Y axis is the counter potential, and the unit is "V", compared with the related art, the counter potential of the present invention is increased by at least 1%, and the performance of the synchronous motor 1 is improved.
In one embodiment of the present invention, it is preferable that the horizontal sectional area S of the tooth shoe 146 of the first tooth 142T1Horizontal cross-sectional area S of tooth shoe 146 with second tooth 144T2The ratio of (A) to (B) satisfies: s is more than or equal to 0.7T1/ST2＜1。
In this embodiment, the horizontal cross-sectional area S of the tooth shoe 146 of the first tooth 142 is specifically definedT1Horizontal cross-sectional area S of tooth shoe 146 with second tooth 144T2Satisfies the following conditions: s is more than or equal to 0.7T1/ST2< 1, it can ensure the equivalent magnetic density of each convex tooth 14, and effectively avoid the problem that the horizontal cross-sectional area of the first tooth 142 is too small compared with the second tooth 144, which causes the distribution of magnetic density at each position to be extremely uneven, and affects the performance of the motor.
In one embodiment of the present invention, preferably, as shown in FIG. 2, the radial width W at the root of the tooth shoe 146 of the first tooth 142T1 is less than the radial width W at the root of the tooth shoe 146 of the second tooth 144T2。
In this embodiment, the set teeth 14 include a main body portion and a tooth shoe 146, the tooth shoe 146 being located at an end of the main body portion near the centerline of the stator core 10, and passing through the tooth shoeThe point at which 146 is connected to the body portion describes a radius line of the annular yoke 12 that extends over the tooth shoe 146 by the radial width at the root of the tooth shoe 146. Since the magnetic density of the tooth 14 on the side forward of the rotor rotation direction is larger than the magnetic density of the tooth 14 on the side reverse to the rotor rotation direction among the two adjacent teeth 14 constituting one phase, which are opposite to the rotation direction of the rotor of the synchronous motor 1, the magnetic densities of the two adjacent teeth 14 constituting the same phase are not uniform, which causes a difference in the magnetic densities of the respective teeth 14 in the adjacent group of teeth 14 in one phase of the synchronous motor, by making the radial width W at the root of the tooth shoe 146 of the first tooth 142 be the sameT1 is less than the radial width W at the root of the tooth shoe 146 of the second tooth 144T2, the magnetic density saturation of the second tooth 146 is reduced, the magnetic density of the convex tooth 14 on the positive side of the rotation direction of the rotor is reduced, the uniform distribution of the magnetic density at each position is facilitated, in addition, the magnetic flux path emitted by the magnet 202 is optimized, and the magnetic flux at the position of the second tooth 144 is increased, so that the counter potential is effectively improved, and the motor performance is improved.
In one embodiment of the present invention, the radial width W at the root of the tooth shoe 146 of the first tooth 142 is preferablyT1 and radial width W at root of tooth shoe 146 of second tooth 144T2 satisfies the following conditions: w is more than or equal to 0.4T1/WT2＜1。
In this embodiment, the radial width W at the root of the tooth shoe 146 of the first tooth 142 is specifically definedT1 and radial width W at root of tooth shoe 146 of second tooth 144T2 satisfies the following conditions: w is more than or equal to 0.4T1/WT2 < 1, the magnetic density of each convex tooth 14 can be ensured to be equivalent, and the problem that the radial width of the root part of the tooth shoe 146 of the first tooth 142 is too small, so that the magnetic density distribution at each position is extremely uneven and the motor performance is influenced is effectively avoided.
In one embodiment of the present invention, it is preferable that the number of turns of the exciting coil wound on the first tooth 142 is not equal to the number of turns of the exciting coil wound on the second tooth 144.
In this embodiment, in two adjacent teeth 14 forming one phase, the magnetic density of the tooth 14 on the positive side of the rotor rotation direction is different from the magnetic density of the tooth 14 on the reverse side of the rotor rotation direction, that is, the magnetic densities of the two adjacent teeth 14 forming the same phase are not uniform, and further, by setting the number of turns of the excitation coil wound on the first tooth 142 to be different from the number of turns of the excitation coil wound on the second tooth 144, the magnetic density distribution at each tooth 14 is facilitated, the iron loss is reduced, and the motor performance is improved.
In one embodiment of the present invention, it is preferable that the number of turns of the exciting coil wound on the first tooth 142 is greater than that of the exciting coil wound on the second tooth 144.
In this embodiment, the number of turns of the field coil wound on the first tooth 142 is greater than that of the field coil wound on the second tooth 144, so that the magnetic density at the first tooth 142 can be properly increased, the magnetic density at the second tooth 144 can be reduced, uniformity of the magnetic densities at each position can be facilitated, back electromotive force can be improved, iron loss can be effectively reduced, and the efficiency of the synchronous motor can be improved. Further, due to the increased horizontal cross-sectional area of the tooth shoe 146 of the second tooth 144, and/or the radial width W at the root of the tooth shoe 146 of the second tooth 144T2, the slot fullness of the slots corresponding to the two sides of the convex teeth 14 is increased, and the number of turns of the excitation coil wound on the second teeth 144 is reduced, so that the slot fullness is maintained, and the problems of reduced manufacturability, difficult winding, easy damage of the excitation coil, high product reject ratio and the like caused by excessive increase of the slot fullness are avoided.
In any of the above solutions, in one embodiment of the present invention, preferably, the slot poles of the synchronous motor 1 are matched to 10 slots 12 poles or 12 slots 14 poles.
In this embodiment, the slot pole of the synchronous machine 1 is preferably fitted with 10 slots 12 poles, or may be 12 slots 14 poles, and fits the radial width W at the root of the tooth shoe 146 of the first tooth 142T1 is less than the radial width W at the root of the tooth shoe 146 of the second tooth 144T2, the synchronous motor 1 has high winding coefficient, high back electromotive force and low copper consumption of the winding, and can realize a high-output and high-efficiency permanent magnet motor; in addition, the space in the groove can be increased, more copper wires are put in, copper consumption is reduced, and efficiency is further improved. Specifically, when the slot poles of the synchronous motor 1 are matched to 12 slots and 14 poles, 4 teeth 14 wound around the same-phase excitation coil are divided into 2 tooth groups, each tooth groupThere are 2 teeth 14, and two tooth groups in phase are symmetrically distributed along the center line of the annular yoke 12.
In one embodiment of the present invention, it is preferable that the winding direction of the exciting coil on the first tooth 142 is opposite to the winding direction of the exciting coil on the second tooth 144.
In this embodiment, by setting the winding direction of the field coil on the first tooth 142 to be opposite to the winding direction of the field coil on the second tooth 144, the winding is facilitated on the one hand, and the length of the field coil can be reduced on the other hand, which saves cost and facilitates smooth rotation of the rotor core 20.
In any of the above technical solutions, in an embodiment of the present invention, preferably, the magnets are permanent magnets, and the permanent magnets are distributed in a straight line or in a V shape on any horizontal section of the rotor core, or the permanent magnets are tangentially magnetized magnets.
In the embodiment, the permanent magnets are arranged in a straight line or V-shaped relative to any horizontal section of the rotor core, or are tangential magnetizing magnets, and when the permanent magnets are arranged in a V-shaped or tangential magnetizing magnet, the magnetic concentration effect is good, the main flux is higher, the back electromotive force is high, and therefore the running efficiency of the motor is high. Of course, the permanent magnets may also be magnets of other shapes, such as a hybrid of radial and tangential configurations. Preferably, the permanent magnet is a rare earth magnet, a ferrite magnet, or a rare earth and ferrite mixed magnet.
In one embodiment of the present invention, when the permanent magnets are distributed in a V-shape, the included angle of the V-shape is preferably in the range of 90 ° to 130 °.
In the embodiment, the included angle of the permanent magnets distributed in the V shape is set to be 90-130 degrees, so that the back electromotive force fundamental wave can be maximized, the copper loss of the winding is reduced, and the running efficiency of the motor is improved.
In one embodiment of the present invention, it is preferable that, as shown in fig. 5 and 6, in any horizontal cross section of rotor core 20, the sum of the lengths of magnets 202 under each pole be bm, the inner diameter of stator core 10 be Di, and the number of pole pairs on rotor core 20 be P, wherein bm × 2P/(pi × Di) ≦ 0.75.
In this embodiment, when the sum of the lengths of the magnets 202 under each pole in any horizontal section of the rotor core 20 is bm, for example, when each pole includes two magnets 202, as shown in fig. 5, one of the magnets 202 has a length bm1, and the other magnet 202 has a length bm2, the sum bm of the lengths of the two magnets 202 is bm1+ bm2, or when each pole has one magnet 202, as shown in fig. 6, the sum bm of the lengths of the magnets 202 under each pole is the length of the magnet 202, by setting the inner diameter of the stator core 10 to Di, the number of pole pairs on the rotor core 20 to P, and satisfying 0.75 ≦ bm × 2P/(pi × Di) ≦ 0.9, the maximum utilization rate of the permanent magnets and the optimum cost performance can be achieved, thereby improving the operating efficiency of the motor.
In one embodiment of the present invention, preferably, as shown in FIG. 7, the central angle of the pole crown of the rotor of the synchronous motor 1 is α 1, and the pole pitch angle is α 2, wherein α 1/α 2 ≧ 0.5.
In this embodiment, by setting the central angle corresponding to each pole crown of the rotor of the synchronous motor 1 to α 1 and the pole pitch angle to α 2, where the pole crown is the portion with the circular arc profile located at the outer periphery of the rotor core 20, as shown in fig. 4, the portion with the circular arc profile at a is the pole crown, in other words, the circular arcs at both sides of the d-axis of the magnetic pole form a whole circular arc with the rotation center as the center of circle, the central angle corresponding to the whole circular arc is α 1, and α 1/α 2 is defined as being equal to or greater than 0.5, sufficient main flux can be provided, the motor performance can be improved, and the manufacturability requirement can be satisfied.
In one embodiment of the present invention, it is preferable that a ratio of the inner diameter Di of the stator core 10 to the outer diameter Do thereof satisfies: Di/Do is more than or equal to 0.52 and less than or equal to 0.57.
In this embodiment, by setting the ratio of the inner diameter Di of the stator core 10 to the outer diameter Do thereof to satisfy: Di/Do is more than or equal to 0.52 and less than or equal to 0.57, so that the optimal cost performance can be obtained while the rotational inertia is met, and the production cost of the motor is reduced.
In one embodiment of the present invention, it is preferable that the rated torque of the synchronous machine 1 is T, the inner diameter of the stator core 10 is Di, and the torque per unit volume of the rotor of the synchronous machine 1 is TPV, which satisfy: 5.18X 10-7≤T×Di-3×TPV-1≤1.17×10-6，5kN·m·m-3≤TPV≤45kN·m·m-3Wherein the rated torque T is expressed in the unit of N.m, the inner diameter Di is expressed in the unit of mm, and the unit volume torque TPV is expressed in the unit of kN.m.m-3。
In this embodiment, the synchronous motor 1 has a rated torque T, an inner diameter Di of the stator core 10, and a torque per unit volume TPV of the rotor, and satisfies 5.18 × 10-7≤T×Di-3×TPV-1≤1.17×10-6Wherein the value range of the unit volume torque TPV is 5 kN.m.m-3≤TPV≤45kN·m·m-3The numerical range of the combined variable of the rated torque T of the motor, the inner diameter Di of the stator core 10 and the unit volume torque TPV of the rotor is limited, so that the motor can meet the power requirement of the compressor 2, and in addition, the motor and the compressor 2 adopting the rotor can effectively reduce the magnetic leakage of the rotor, increase the utilization rate of the permanent magnet and improve the efficiency of the motor.
As shown in fig. 8, another aspect embodiment of the present invention provides a compressor 2, including: a synchronous machine 1 as in any one of the above embodiments.
The compressor 2 provided by the present invention has the advantages of the synchronous motor 1 in any of the above embodiments, and therefore, the present invention is not repeated herein.
In one embodiment of the present invention, preferably, the compressor 2 further includes: the synchronous motor comprises a cylinder, a piston, a main bearing and an auxiliary bearing which are arranged at two ends of the cylinder, a crankshaft connected with the cylinder, a first terminal and a second terminal which are arranged on a shell of a compressor 2, an outgoing line connected with a synchronous motor 1 and an exhaust pipe arranged on the shell of the compressor 2, wherein the synchronous motor 1 is sleeved on the crankshaft, and binding posts are respectively arranged on the first terminal and the second terminal.
In the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (14)
1. A synchronous machine, comprising:
the rotor core comprises a rotor punching sheet and a slot, and a magnet is arranged in the slot; and
a stator core including an annular yoke and a plurality of teeth circumferentially spaced along a center line of the annular yoke, the plurality of teeth including a plurality of tooth groups, each tooth group including a first tooth and a second tooth sequentially arranged in a rotation direction of the rotor core, the first tooth and the second tooth having an in-phase field coil wound thereon, any two adjacent tooth groups being wound with field coils of different phases;
wherein a horizontal cross-sectional area of the tooth shoe of the first tooth is not equal to a horizontal cross-sectional area of the tooth shoe of the second tooth.
2. Synchronous machine according to claim 1,
the first isHorizontal cross-sectional area S of tooth shoe of toothT1Horizontal cross-sectional area S of tooth shoe with second toothT2The ratio of (A) to (B) satisfies: s is more than or equal to 0.7T1/ST2＜1。
3. Synchronous machine according to claim 1 or 2,
a radial width W at a tooth shoe root of the first toothT1 is smaller than the radial width W at the root of the tooth shoe of the second toothT2；
A radial width W at a tooth shoe root of the first toothT1 and the radial width W at the root of the tooth shoe of the second toothT2 satisfies the following conditions: w is more than or equal to 0.4T1/WT2＜1。
4. Synchronous machine according to claim 1 or 2,
the number of turns of the exciting coil wound on the first tooth is not equal to the number of turns of the exciting coil wound on the second tooth.
5. The synchronous machine according to claim 4,
the number of turns of the exciting coil wound on the first tooth is larger than that of the exciting coil wound on the second tooth.
6. Synchronous machine according to claim 1 or 2,
the slot poles of the synchronous motor are matched into 10 slots 12 poles or 12 slots 14 poles.
7. Synchronous machine according to claim 1 or 2,
a winding direction of the excitation coil on the first tooth is opposite to a winding direction of the excitation coil on the second tooth.
8. Synchronous machine according to claim 1 or 2,
the permanent magnets are arranged on any horizontal section of the rotor core in a straight line shape or a V-shaped shape, or the permanent magnets are tangential magnetizing magnets.
9. The synchronous machine of claim 8,
when the permanent magnets are distributed in a V shape, the included angle range of the V shape is 90-130 degrees.
10. Synchronous machine according to claim 1 or 2,
on any horizontal section of the rotor core, the sum of the lengths of the magnets under each pole is bm, the inner diameter of the stator core is Di, the number of pole pairs on the rotor core is P, wherein bm × 2P/(pi × Di) is more than or equal to 0.75 and less than or equal to 0.9.
11. Synchronous machine according to claim 1 or 2,
the central angle corresponding to the pole crown of the rotor of the synchronous motor is α 1, the pole pitch angle is α 2, wherein α 1/α 2 is more than or equal to 0.5.
12. Synchronous machine according to claim 1 or 2,
the ratio of the inner diameter Di of the stator core to the outer diameter Do thereof satisfies the following conditions: Di/Do is more than or equal to 0.52 and less than or equal to 0.57.
13. Synchronous machine according to claim 1 or 2,
the rated torque of the synchronous motor is T, the inner diameter of the stator core is Di, and the unit volume torque of the rotor of the synchronous motor is TPV, and the rated torque and the inner diameter of the stator core meet the following requirements:
5.18×10-7≤T×Di-3×TPV-1≤1.17×10-6，
5kN·m·m-3≤TPV≤45kN·m·m-3，
wherein the rated torque T is in the unit of N.m, and the inner diameter Di is in the unit ofIs mm, and the unit volume torque TPV is kN.m.m-3。
14. A compressor, characterized by comprising a synchronous electric machine according to any one of claims 1 to 13.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811003910.XA CN110875643A (en) | 2018-08-30 | 2018-08-30 | Synchronous motor and compressor |
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| CN201811003910.XA CN110875643A (en) | 2018-08-30 | 2018-08-30 | Synchronous motor and compressor |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104079083A (en) * | 2013-03-29 | 2014-10-01 | 陈正虎 | Internal-rotation type stator |
| CN105474512A (en) * | 2013-09-02 | 2016-04-06 | 三菱电机株式会社 | Synchronous electric motor |
| CN207612133U (en) * | 2017-12-27 | 2018-07-13 | 安徽美芝精密制造有限公司 | Magneto and compressor |
-
2018
- 2018-08-30 CN CN201811003910.XA patent/CN110875643A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104079083A (en) * | 2013-03-29 | 2014-10-01 | 陈正虎 | Internal-rotation type stator |
| CN105474512A (en) * | 2013-09-02 | 2016-04-06 | 三菱电机株式会社 | Synchronous electric motor |
| CN207612133U (en) * | 2017-12-27 | 2018-07-13 | 安徽美芝精密制造有限公司 | Magneto and compressor |
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