CN110875677A - Synchronous motor and compressor - Google Patents
Synchronous motor and compressor Download PDFInfo
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- CN110875677A CN110875677A CN201811005338.0A CN201811005338A CN110875677A CN 110875677 A CN110875677 A CN 110875677A CN 201811005338 A CN201811005338 A CN 201811005338A CN 110875677 A CN110875677 A CN 110875677A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
- H02K21/145—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having an annular armature coil
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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
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
- H02K1/2773—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect consisting of tangentially magnetized radial magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/02—Details
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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 core comprises a rotor punching sheet and a slot, and a magnet is arranged in the slot; the stator core comprises an annular magnet yoke and a plurality of convex teeth which are distributed at intervals along the circumferential direction of the central line of the annular magnet 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, and the same-phase magnet exciting coils are wound on the first tooth and the second tooth; wherein the maximum width Tw1 of the first tooth is smaller than the maximum width Tw2 of the second tooth, and meets the requirement that Tw1/Tw2 is more than or equal to 0.4 and less than 1. According to the invention, the maximum width Tw1 of the first tooth is set to be smaller than the maximum width Tw2 of the second tooth, so that a flux path is optimized, the counter potential can be effectively increased, the copper consumption of a winding is reduced, and the high-output synchronous 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 magnet yoke and a plurality of convex teeth which are distributed at intervals along the circumferential direction of the central line of the annular magnet 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, and the same-phase magnet exciting coils are wound on the first tooth and the second tooth; wherein the maximum width Tw1 of the first tooth is smaller than the maximum width Tw2 of the second tooth, and meets the requirement that Tw1/Tw2 is more than or equal to 0.4 and less than 1.
The synchronous motor provided by the invention 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 magnetic yoke, the plurality of convex teeth 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 which is sequentially arranged in each tooth group along the rotation direction of the rotor core is taken as a first tooth, the 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, and the maximum width Tw1 of the first tooth and the maximum width Tw2 of the second tooth are set to meet the condition that Tw1/Tw2 is more than or equal to 0.4 and less than or equal to 1, so that a magnetic flux path is optimized, counter potential can be effectively improved, copper loss of a winding is. 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, and the invention reduces the magnetic flux density saturation of the second tooth by making the maximum width Tw1 of the first tooth smaller than the maximum width Tw2 of the second tooth, the magnetic flux density of the convex teeth on the positive side of the rotation direction of the rotor is reduced, uniform distribution of the magnetic flux density at each position is facilitated, a magnetic flux path emitted by the permanent magnet is optimized, and the magnetic flux at the second teeth is increased, so that the counter potential is effectively improved, and the performance of the synchronous motor is improved. Specifically, the maximum width Tw1 of the first tooth and the maximum width Tw2 of the second tooth are limited to be 0.4 ≤ Tw1/Tw2<1, so that the back electromotive force can be increased by at least 1%, and the phenomenon that the maximum width of the first tooth is too small and is less than 0.4 times of the width of the second tooth, which causes extreme non-uniform magnetic density distribution at each position and influences the performance of the synchronous motor, can be effectively avoided.
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 slot poles of the synchronous motor are matched to 10 slots 12 poles or 12 slots 14 poles.
In the technical scheme, the slot pole matching of the synchronous motor is preferably 10 slots and 12 poles, or 12 slots and 14 poles, the maximum width Tw1 of the first tooth is smaller than the maximum width Tw2 of the second tooth, and the requirement that the maximum width Tw2 is more than or equal to 0.4 and less than or equal to Tw1/Tw2<1 is met, so that the synchronous motor not only has higher winding coefficient, but also has high back electromotive force and low copper consumption of the winding, and can realize a high-output and high-efficiency synchronous 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 magnets are permanent magnets which can be distributed 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 distributed 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 synchronous 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 operation efficiency of the synchronous 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-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 operating efficiency of the synchronous 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 synchronous 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 synchronous 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 synchronous motor, the inner diameter Di of the stator core and the unit volume torque TPV of the rotor is limited, so that the synchronous motor can meet the power requirement of the compressor, and in addition, the magnetic flux leakage of the rotor can be effectively reduced, the utilization rate of the permanent magnet is increased, and the efficiency of the synchronous motor is improved.
In any of the above solutions, preferably, the radial width W at the root of the pole shoe of the first tooth end isT1 is smaller than the radial width W at the root of the pole shoe of the second tooth endT2。
In this solution, the radial width W at the root of the pole shoe of the first tooth end is setT1 is smaller than the radial width W at the root of the pole shoe of the second tooth endT2, the pole shoe is positioned at one end of the convex tooth close to the central line of the stator core, a radius line of an annular magnetic yoke is drawn through a point where the pole shoe is connected with the convex tooth, the length of the radius line extending on the pole shoe is the radial width of the root of the pole shoe, the magnetic flux path is optimized, the back electromotive force can be effectively improved, the copper consumption of a winding is reduced, and high output is realizedThe synchronous machine of (1). Specifically, in contrast to the rotation direction of the rotor of the synchronous motor, in two teeth adjacent to constitute one phase, the magnetic density of the tooth on the side forward to the rotation direction of the rotor is larger than the magnetic density of the tooth on the side reverse to the rotation direction of the rotor, so the magnetic densities of two adjacent teeth constituting the same phase are not uniform, which causes a difference in the magnetic densities of the respective teeth in the adjacent set of teeth in one phase of the synchronous motor, whereas the present invention is provided by making the radial width W at the root of the pole shoe at the end of the first tooth be differentT1 is smaller than the radial width W at the root of the pole shoe of the second tooth endTAnd 2, the magnetic density saturation of the whole second tooth is reduced, the magnetic density of the convex tooth on the positive side of the rotor in the rotating direction is reduced, the uniform distribution of the magnetic density at each position is facilitated, a magnetic flux path emitted by the permanent 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 synchronous motor is improved.
In any of the above solutions, preferably, the radial width W at the root of the pole shoe of the first tooth end isT1 and radial width W at the root of the pole shoe of the second tooth endT2 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 pole shoe of the first tooth end is specifically definedT1 and radial width W at the root of the pole shoe of the second tooth endT2 satisfies the following conditions: w is more than or equal to 0.4T1/WT2<1, the 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 and the performance of the synchronous motor is influenced due to the fact that the radial width of the root part of a pole shoe at the end part of the first tooth is too small is effectively avoided.
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 illustrates a schematic top view of a rotor core of an embodiment of the present invention;
FIG. 5 shows a schematic top view of a rotor core of another embodiment of the present invention;
FIG. 6 shows a schematic top view of a rotor core of yet another embodiment of the present invention;
fig. 7 shows a schematic configuration 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, fig. 2, fig. 4 to fig. 7 is:
1 synchronous motor, 10 stator core, 12 annular yoke, 14 convex tooth, 142 first tooth, 144 second tooth, 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 to 7.
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 sheet and a slot, in which a magnet 202 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 in-phase field coils; the maximum width Tw1 of the first tooth 142 is smaller than the maximum width Tw2 of the second tooth 144, and meets the requirement that Tw1/Tw2 is more than or equal to 0.4 and less than 1.
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 202, the stator core 10 comprises a plurality of convex teeth 14 which are circumferentially distributed at intervals inside an annular magnet yoke 12, the convex teeth 14 can be divided into a plurality of tooth groups, each tooth group is wound with an excitation coil with the same phase, any two adjacent tooth groups are wound with excitation coils with different phases, by using the first teeth 14 in each tooth group arranged in order in the rotation direction of rotor core 20 as first teeth 142, the second teeth 14 in each tooth group arranged in order in the rotation direction of rotor core 20 as second teeth 144, and the maximum width Tw1 of the first tooth 142 and the maximum width Tw2 of the second tooth 144 are set to meet the requirement that Tw1/Tw2 is more than or equal to 0.4 and less than or equal to 1, so that a flux path is optimized, counter electromotive force can be effectively improved, copper loss of a winding is reduced, and the high-output synchronous motor 1 is realized. Specifically, in contrast to the rotation direction of the rotor of the synchronous motor 1, for two teeth 14 adjacent to each other in one phase, the magnetic density of the tooth 14 on the side forward to the rotation direction of the rotor is greater than the magnetic density of the tooth 14 on the side reverse to the rotation direction of the rotor, so the magnetic densities of two adjacent teeth 14 in 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 1, whereas the present invention reduces the saturation of the magnetic density of the second tooth 144, reduces the magnetic density of the tooth 14 on the side forward to the rotation direction of the rotor by making the maximum width Tw1 of the first tooth 142 smaller than the maximum width Tw2 of the second tooth 144, facilitates uniform distribution of the magnetic densities, optimizes the path of the magnetic flux emitted by the permanent magnet, increases the magnetic flux at the second tooth 144, thereby effectively increasing the back electromotive force and improving the performance of the synchronous motor 1. Specifically, the maximum width Tw1 of the first tooth 142 and the maximum width Tw2 of the second tooth 144 are defined to satisfy 0.4 ≦ Tw1/Tw2<1, as can be seen from fig. 3, the X axis is the counter potential harmonic frequency, the Y axis is the line counter potential, and the unit is "V", compared with the related art, the line counter potential of the present invention is increased by at least 1%, and it is effectively avoided that the maximum width of the first tooth 142 is too small and is less than 0.4 times of the width of the second tooth 144, which causes the magnetic density distribution unevenness at each position and affects the performance of the synchronous motor 1.
In one embodiment of the invention, the slot poles of the synchronous machine 1 are preferably fitted as 10-slot 12-pole or 12-slot 14-pole.
In this embodiment, the slot pole matching of the synchronous motor 1 is preferably 10 slots and 12 poles, or may be 12 slots and 14 poles, the maximum width Tw1 of the first tooth 142 is smaller than the maximum width Tw2 of the second tooth 144, and it satisfies 0.4 ≤ Tw1/Tw2<1, so that the synchronous motor 1 not only has a high winding coefficient, but also has a high back electromotive force, and a low copper consumption of the winding, and can realize a high-output and high-efficiency synchronous motor 1; 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 14 poles, 4 teeth 14 wound around the excitation coil of the same phase are divided into 2 tooth groups, each tooth group has 2 teeth 14, and two tooth groups of the same phase are symmetrically distributed along the center line of the ring 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 one embodiment of the present invention, preferably, the magnets 202 are permanent magnets, which are distributed in a straight line or in a V-shape on any horizontal cross section of the rotor core 20, or the permanent magnets are tangentially magnetized magnets.
In this embodiment, the magnets 202 are permanent magnets, which may be distributed in a straight line or V-shaped relative to any horizontal cross-section of the rotor core 20, or tangentially magnetized magnets, and when the permanent magnets are distributed in a V-shaped or tangentially magnetized magnets, the magnetic flux concentration effect is good, the main flux is higher, the back electromotive force is high, and thus the operation efficiency of the synchronous motor 1 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 this embodiment, by setting the included angle of the permanent magnets in V-shaped distribution between 90 ° and 130 °, the back electromotive force fundamental wave can be maximized, the winding copper loss is reduced, and the operating efficiency of the synchronous motor 1 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 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 set to bm, for example, when each pole includes two magnets 202, as shown in fig. 5, one of the magnets is set to bm1, and the other magnet is set to bm2, the sum bm of the lengths of the two magnets 202 is bm1+ bm2, or when each pole has one magnet, as shown in fig. 6, the sum bm of the lengths of the magnets 202 under each pole is the length of the magnet, by setting the inner diameter of the stator core 10 to be Di, the number of poles on the rotor core 20 to be P, and satisfying 0.75 or more bm × 2P/(pi × Di) or more than 0.9, the highest utilization rate of the permanent magnets and the most cost-performance can be achieved, thereby improving the operation efficiency of the synchronous motor 1.
In one embodiment of the present invention, preferably, as shown in FIG. 4, 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 performance of the synchronous motor 1 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 synchronous motor 1 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-3By definingThe value range of the combination variable of the rated torque T of the synchronous motor 1, the inner diameter Di of the stator core 10 and the unit volume torque TPV of the rotor enables the synchronous motor 1 to meet the power requirement of the compressor 2, and in addition, the synchronous motor 1 and the compressor 2 which adopt 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 synchronous motor 1.
In one embodiment of the present invention, preferably, as shown in FIG. 2, the radial width W at the root of the pole piece at the end of the first tooth 142T1 is less than the radial width W at the root of the pole shoe at the end of the second tooth 144T2。
In this embodiment, by setting the radial width W at the root of the pole piece at the end of the first tooth 142T1 is less than the radial width W at the root of the pole shoe at the end of the second tooth 144T2, the pole shoe is positioned at one end of the convex tooth 14 close to the central line of the stator core 10, a radius line of the annular magnetic yoke 12 is drawn through a point where the pole shoe is connected with the convex tooth 14, the length of the radius line extending on the pole shoe is the radial width of the root of the pole shoe, the magnetic flux path is optimized, the back electromotive force can be effectively improved, the copper consumption of a winding is reduced, and the high-output synchronous motor 1 is realized. Specifically, in contrast to the rotation direction of the rotor of the synchronous motor 1, for two teeth 14 adjacent to constitute one phase, the magnetic density of the tooth 14 on the side forward to the rotation direction of the rotor is larger than the magnetic density of the tooth 14 on the side reverse to the rotation direction of the rotor, so the magnetic densities of two adjacent teeth 14 adjacent to constitute the same phase are not uniform, which causes a difference in the magnetic densities of the respective teeth 14 in the adjacent set of teeth 14 in one phase of the synchronous motor 1, whereas the present invention is made by making the radial width W at the root of the pole piece at the end of the first tooth 142 be differentT1 is less than the radial width W at the root of the pole shoe at the end of the second tooth 144T2, the magnetic density saturation of the whole second tooth 144 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, a magnetic flux path emitted by the permanent 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 performance of the synchronous motor 1 is improved.
In one embodiment of the present invention, it is preferred that at the root of the pole shoe at the end of the first tooth 142Radial width W T1 and radial width W at the root of the pole shoe at the end of the 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 pole piece at the end of the first tooth 142 is specifically definedT1 and radial width W at the root of the pole shoe at the end of the 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 magnetic density distribution at each position is extremely uneven to influence the performance of the synchronous motor 1 due to the fact that the radial width of the root of the pole shoe at the end part of the first tooth 142 is too small is effectively avoided.
As shown in fig. 7, 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 (10)
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
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, and the first tooth and the second tooth are wound with same-phase magnet exciting coils;
wherein the maximum width Tw1 of the first tooth is smaller than the maximum width Tw2 of the second tooth, and satisfies 0.4 ≦ Tw1/Tw2< 1.
2. Synchronous machine according to claim 1,
the slot poles of the synchronous motor are matched into 10 slots 12 poles or 12 slots 14 poles.
3. Synchronous machine according to claim 1,
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.
4. Synchronous machine according to any of claims 1 to 3,
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.
5. The synchronous machine according to claim 4,
when the permanent magnets are distributed in a V shape, the included angle range of the V shape is 90-130 degrees.
6. Synchronous machine according to any of claims 1 to 3,
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.
7. Synchronous machine according to any of claims 1 to 3,
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.
8. Synchronous machine according to any of claims 1 to 3,
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.
9. Synchronous machine according to any of claims 1 to 3,
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 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。
10. A compressor, characterized by comprising a synchronous electric machine according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811005338.0A CN110875677A (en) | 2018-08-30 | 2018-08-30 | Synchronous motor and compressor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811005338.0A CN110875677A (en) | 2018-08-30 | 2018-08-30 | Synchronous motor and compressor |
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| Publication Number | Publication Date |
|---|---|
| CN110875677A true CN110875677A (en) | 2020-03-10 |
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| CN201811005338.0A Pending CN110875677A (en) | 2018-08-30 | 2018-08-30 | Synchronous motor and compressor |
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| CN (1) | CN110875677A (en) |
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