CN217307413U - EC permanent magnet motor and rotor thereof - Google Patents

Abstract

The utility model relates to an electrical equipment technical field especially relates to an EC permanent-magnet machine and rotor thereof. The permanent magnet rotor comprises a rotor iron core, a plurality of permanent magnets, a rotating shaft and a cover plate; the rotating shaft penetrates through the rotor iron core; the rotor core is formed by laminating a plurality of rotor punching sheets along the axial direction, the rotor punching sheets are formed by punching a progressive die, and the center of each rotor punching sheet is provided with a shaft hole for the rotating shaft to pass through; the rotor punching sheet is provided with a plurality of ventilation holes in the radial direction, the outer side of the rotor punching sheet, which is located in the ventilation holes, is provided with a plurality of balance holes in the radial direction, and a ventilation hole is formed between every two adjacent balance holes. Among this technical scheme, design a plurality of radial ventilation holes on the rotor punching, both showed the hole that is the axial through on rotor core, when cutting magnetic force rotated, radial ventilation hole can be to the heat that gives out in the motor, even stirring, made the temperature decline gradually, improved the motor performance, avoided the permanent magnet demagnetization.

Description

EC permanent magnet motor and rotor thereof

Technical Field

The utility model relates to an electrical equipment technical field especially relates to an EC permanent-magnet machine and rotor thereof.

Background

The EC motor power supply is a direct current power supply, an internal or external direct current to alternating current (through six inverter modules), a rotor position feedback, a three-phase alternating current, a permanent magnet and a synchronous motor (direct current brushless is only the representation of the power quality and the motor, but not the essence of the motor, and the EC motor is a three-phase alternating current permanent magnet synchronous motor substantially).

The EC motor is a DC motor using an electronic commutation device to replace mechanical commutation, and mainly comprises a synchronous motor body, a power electronic inverter, a rotor position detector and a controller. The rotor of the synchronous motor is mainly composed of a permanent magnet (neodymium iron boron) and the like.

The brushless DC motor is greatly simplified in structure because a collecting ring and an electric brush for excitation are omitted. Meanwhile, the manufacturability of the motor is improved, the mechanical reliability of the motor in operation is greatly enhanced, and the service life is prolonged.

The rotor core, which is a component of the rotor, is formed by stacking a plurality of steel plates, and permanent magnets are embedded in the stacked steel plates. In the EC motor, eddy currents are generated in the rotor core due to the alternating magnetic field between the stator and the rotor during operation, and the eddy currents are generated not only on the surface of the steel plate but also in the axial direction of the rotor core via the lamination direction, thereby increasing the degree of heat generation of the rotor. When the permanent magnet is heated to about 120 ℃, the permanent magnet can be gradually demagnetized and the endurance is reduced, so that the temperature in the compression motor is increased, the power and the efficiency of the motor are reduced, and the motor cannot be started seriously.

In addition, in order to further reduce the axial thrust when the rotor rotates and reduce the load of the bearing, one end or both ends of the rotor need to be further provided with a balance weight.

Therefore, the rotor structure in the EC motor needs to be further redesigned in size.

Disclosure of Invention

In order to solve the above problems, a first object of the present invention is to provide a rotor, on which a heat dissipation structure and a rotor balance structure are designed, so as to further improve the heat dissipation of the rotor and maximize the rotor balance; a second object of the present invention is to provide an EC permanent magnet motor having the above-mentioned rotor.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the permanent magnet rotor comprises a rotor iron core, a plurality of permanent magnets, a rotating shaft and a cover plate; the rotating shaft penetrates through the rotor iron core, the permanent magnets are embedded in the rotor iron core and are arranged circumferentially, and the cover plate is arranged at the end part of the rotor iron core along the axial direction; the method is characterized in that: the rotor core is formed by laminating a plurality of rotor punching sheets along the axial direction, the rotor punching sheets are formed by punching a progressive die, and the center of each rotor punching sheet is provided with a shaft hole for the rotating shaft to pass through; the rotor punching sheet is provided with a plurality of ventilation holes in the radial direction, the outer side of the rotor punching sheet, which is located in the ventilation holes, is provided with a plurality of balance holes in the radial direction, and a ventilation hole is formed between every two adjacent balance holes.

Among the above-mentioned technical scheme, rotor core is laminated layer upon layer by rotor punching axial and is formed, designs a plurality of radial ventilation holes on the rotor punching, both shows the hole that has a perfect understanding for the axial on rotor core, and when cutting magnetic force rotated, radial ventilation hole can be to the heat that gives out in the motor, and even stirring makes the temperature decline gradually, improves the motor performance, avoids the permanent magnet demagnetization. In addition, a plurality of balance holes radially distributed on the outer side of the vent hole realize dynamic balance of the rotor through the balance weight, so that the abrasion of parts such as a bearing, a shaft seal and the like due to the vibration of the rotor is avoided, the motor can run more stably, and the service life of the motor is further prolonged. Moreover, the arrangement of the radial vent holes and the balance holes greatly reduces the use of materials and reduces the manufacturing cost.

Preferably, the plurality of vent holes are uniformly distributed along the same circumferential line by taking the shaft hole as a center, an included angle between a connecting line from the center point of the shaft hole to the hole center of the vent hole and a connecting line from the center point of the shaft hole to the hole center of the adjacent vent hole is alpha, and alpha is 36 degrees; the diameter of the vent hole is 9.8-10.3 cm. In the technical scheme, a plurality of radial vent holes are uniformly distributed along the same circumferential line, so that the heat in the motor can be uniformly stirred, the heat in each position can be dissipated, and the running performance of the motor is improved; the number in ventilation hole is 10, and the diameter is 9.8 ~ 10.3cm, and through experimental data verification, so setting up can promote the radiating effect greatly to make rotor core can not influence the operation efficiency because of the quality size.

Preferably, the balancing holes are uniformly distributed along the same circumferential line by taking the shaft hole as a center, an included angle between a connecting line from the center point of the shaft hole to the hole center of the balancing hole and a connecting line from the center point of the shaft hole to the hole center of the adjacent balancing hole is gamma, and gamma is 36 degrees; the diameter of the balance hole is 4.2-4.8 cm. In the technical scheme, a plurality of radial balance holes are uniformly distributed along the same circumferential line, so that the counterweight range is increased, the balance of 360 degrees is kept, and the rotor is balanced extremely; the number of this balancing hole is 10, and the diameter is 4.2 ~ 4.8cm, and through experimental data verification, so set up, can satisfy 360 degrees counter weight demands and accomplish rotor balance on a wider range to can not disturb the operating performance of motor.

Preferably, a plurality of rotor grooves are further radially formed in the rotor punching sheet and located on the outer side of the balance hole, and the rotor grooves are evenly distributed along the same circumferential line with the shaft hole as the center.

Preferably, the cross section of the rotor slot is a sector, a central point of the shaft hole is taken as a circular point, and a connecting line between the central point of the shaft hole and the hole center of the balance hole extends through the midpoint of an arc line of the sector.

Preferably, the distance between the lower ends of the rotor grooves is 25.5-26.35 cm, the distance between the upper ends of the rotor grooves is 28-30.06 cm, and the inner width of the rotor grooves is 5-6 cm.

The technical scheme relates to the design of the rotor slots, and the original large number of small slots are replaced by the small number of large slots, so that the area occupied by slot insulation can be reduced, the slot fullness rate is improved, and the performance of the motor is further improved; meanwhile, the number of winding elements is relatively small, so that the wire inserting process and the wire connecting process can be simplified, and the cost is reduced. Meanwhile, the short distance and the distribution effect of the winding are increased, and the sine of the counter potential waveform is improved. Moreover, the design of the large slots, such that the reduction of components, further reduces the temperature rise inside the rotor.

Preferably, a magnetic isolation bridge is arranged between two adjacent rotor grooves, the width of the magnetic isolation bridge is 1.45-1.65 cm, and the center line in the length direction of the magnetic isolation bridge extends through the center of the vent hole and the center point of the shaft hole. In the technical scheme, the sum of the air gap flux and the leakage flux is the total flux generated by all the permanent magnets on the motor, and in order to prevent the utilization rate of the permanent magnets from being too low due to the overlarge leakage coefficient of the permanent magnets, a magnetic isolation bridge is arranged, and the height of a rotor yoke is reduced. The principle of the magnetic isolation bridge is that the magnetic flux at the magnetic bridge part is saturated to play a role in limiting the magnetic leakage, so that the smaller the width of the magnetic isolation bridge is, the better the magnetic isolation effect is from the perspective of preventing the magnetic leakage. The size design can meet the requirement of no-load magnetic leakage coefficient, has enough strength, and can improve the mechanical strength of the motor and reduce the manufacturing cost of the motor.

Preferably, the edge of the shaft hole extends outwards to form a registration groove, the registration groove and the shaft hole are in arc transition, the cross section of the registration groove is in a right trapezoid shape, and the lengths of two bottom edges of the registration groove are 1.6cm and 3.2cm respectively. In the technical scheme, the design of the alignment groove is used for better connecting splines, and the connection is smoother due to the arc design.

Preferably, the cover plate comprises an upper cover plate and a lower cover plate, and hole sites corresponding to the balance holes and the vent holes are respectively formed in the upper cover plate and the lower cover plate. In the technical scheme, the cover plate is designed to encapsulate the permanent magnet in the rotor core, and the heat dissipation and the balance weight in the rotor core are not influenced through the hole site design opposite to the vent hole and the balance hole on the cover plate.

An EC permanent magnet motor comprising a rotor as claimed in any one of the above, characterized in that: still include frame, stator core and install in stator core's winding coil, stator core is folded by stator punching axial and is pressed and form, stator core and rotor setting are in the frame, the rotatable setting of rotor is in stator core's hollow region. In the technical scheme, the size of the stator core in the EC permanent magnet motor is specially designed to be matched with the change of the rotor structure, and the coil on the stator core adopts a centralized winding.

Drawings

Fig. 1 is a schematic structural diagram of a cross section of a rotor sheet of an EC permanent magnet motor.

Fig. 2 is an enlarged schematic view of an M-position alignment groove structure on a rotor sheet of an EC permanent magnet motor.

Fig. 3 is an exploded view of an EC permanent magnet motor.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation of the first and second features not being in direct contact, but being in contact with another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The first embodiment is as follows:

a rotor as shown in fig. 1 to 3 includes a rotor core 1, a plurality of permanent magnets 2, a rotating shaft 3, and a cover plate 4; the rotating shaft 3 penetrates through the rotor core 1, the permanent magnets 2 are embedded in the rotor core 1 and are circumferentially arranged, and the cover plate 4 is axially arranged at the end part of the rotor core 1; the rotor core 1 is formed by laminating a plurality of rotor punching sheets 5 along the axial direction, the rotor punching sheets 5 are formed by punching a progressive die, and a shaft hole 6 for a rotating shaft 3 to pass through is formed in the center of each rotor punching sheet 5; radially being equipped with a plurality of ventilation holes 7 on the rotor punching 5, the outside that just is located ventilation hole 7 on the rotor punching 5 radially is equipped with a plurality of balance holes 8, is equipped with a ventilation hole 7 between two adjacent balance holes 8.

Among the above-mentioned technical scheme, rotor core 1 is laminated layer upon layer by rotor punching 5 axial and is formed, designs a plurality of radial ventilation holes 7 on rotor punching 5, has both shown the hole that is the axial through on rotor core 1, and when cutting magnetic force rotated, radial ventilation hole 7 can be the heat that gives out in the motor, and even stirring makes the temperature descend gradually, improves the motor performance, avoids the permanent magnet demagnetization. In addition, a plurality of balance holes 8 radially distributed on the outer side of the vent hole 7 realize dynamic balance of the rotor through balance weights, abrasion of parts such as a bearing and a shaft seal is prevented from being accelerated due to vibration of the rotor, the motor can run more stably, and the service life of the motor is further prolonged. Moreover, the arrangement of the radial ventilation holes and the balance holes greatly reduces the use of materials and the manufacturing cost.

Furthermore, the plurality of vent holes 7 are uniformly distributed along the same circumferential line by taking the shaft hole 6 as the center, and an included angle between a connecting line from the center point of the shaft hole 6 to the hole center of the vent hole 7 and a connecting line from the center point of the shaft hole 6 to the hole center of the adjacent vent hole 7 is alpha, wherein alpha is 36 degrees; the diameter of the vent hole 7 is 9.8-10.3 cm. In the technical scheme, a plurality of radial vent holes 7 are uniformly distributed along the same circumferential line, so that the internal heat can be uniformly stirred, the heat at each position can be dissipated, and the running performance of the motor is improved; the number of ventilation hole 7 is 10, and the diameter is 9.8 ~ 10.3cm, and through experimental data verification, so setting up can promote the radiating effect greatly to make rotor core 1 can not influence the operation efficiency because of the quality size.

Furthermore, the balancing holes 8 are uniformly distributed along the same circumferential line by taking the shaft hole 6 as a center, an included angle between a connecting line from the center point of the shaft hole 6 to the hole center of the balancing hole 8 and a connecting line from the center point of the shaft hole 6 to the hole center of the adjacent balancing hole 8 is gamma, and gamma is 36 degrees; the diameter of the balance hole 8 is 4.2-4.8 cm. In the technical scheme, a plurality of radial balance holes 8 are uniformly distributed along the same circumferential line, so that the balance weight range is increased, the balance of 360 degrees is kept, and the rotor is balanced extremely; this balance hole 8's number is 10, and the diameter is 4.2 ~ 4.8cm, verifies through experimental data, so sets up, can satisfy 360 degrees counter weight demands and accomplish more extensive rotor balance to can not disturb the operating performance of motor.

Furthermore, a plurality of rotor grooves 9 are radially arranged on the rotor punching sheet 5 and positioned outside the balance holes 8, and the rotor grooves 9 are uniformly distributed along the same circumferential line with the shaft hole 6 as the center.

Furthermore, the cross section of the rotor groove 9 is a sector and takes the center point of the shaft hole 6 as a circular point, and a connecting line between the center point of the shaft hole 6 and the hole center of the balance hole 8 extends through the midpoint of a sector arc line.

Furthermore, the distance between the lower ends of the rotor slots 9 is 25.5-26.35 cm, the distance between the upper ends is 28-30.06 cm, and the inner width is 5-6 cm.

The technical scheme relates to the design of the rotor slots 9, and the original more-number small slots are replaced by less-number large slots, so that the area occupied by slot insulation can be reduced, the slot fullness rate is improved, and the performance of the motor is further improved; meanwhile, the number of winding elements is relatively small, so that the wire inserting process and the wire connecting process can be simplified, and the cost is reduced. Meanwhile, the short distance and the distribution effect of the winding are increased, and the sine of the counter potential waveform is improved. Furthermore, the large slot design, such that the reduction of components, further reduces the temperature rise inside the rotor.

Furthermore, a magnetic isolation bridge 11 is arranged between two adjacent rotor grooves 9, the width of the magnetic isolation bridge 11 is 1.45-1.65 cm, and a center line along the length direction of the magnetic isolation bridge 11 extends through the center of the vent hole 7 and the center of the shaft hole 6. In the technical scheme, the sum of the air gap flux and the leakage flux is the total flux generated by all the permanent magnets 2 on the motor, and in order to prevent the utilization rate of the permanent magnets 2 from being too low due to the overlarge leakage flux coefficient of the permanent magnets 2, the magnetic isolation bridge 11 is arranged, and the height of a rotor yoke is reduced. The magnetic isolation bridge 11 has a principle that the magnetic flux at the magnetic bridge portion is saturated to limit the leakage flux, so that the smaller the width of the magnetic isolation bridge is, the better the magnetic isolation effect is from the viewpoint of preventing the leakage flux. The size design can meet the requirement of no-load magnetic leakage coefficient, has enough strength, and can improve the mechanical strength of the motor and reduce the manufacturing cost of the motor.

Furthermore, the edge of the shaft hole 6 extends outwards to be provided with a positioning groove 12, the positioning groove 12 and the shaft hole 6 are in arc transition, the cross section of the positioning groove 12 is in a right trapezoid shape, and the lengths of two bottom edges of the positioning groove 12 are 1.6cm and 3.2cm respectively. In the technical scheme, the design of the alignment groove 12 is used for better connecting splines, and the connection is smoother due to the arc design.

Further, the cover plate 4 comprises an upper cover plate and a lower cover plate, and hole sites corresponding to the balance holes 8 and the vent holes 7 are respectively arranged on the upper cover plate and the lower cover plate. In this technical scheme, the design of apron 4 is used for encapsulating permanent magnet 2 in rotor core 1 to through the hole site design relative with ventilation hole 7 and balancing hole 8 on the apron 4, do not influence heat dissipation and counter weight in the rotor core 1.

The second embodiment:

an EC permanent magnet motor comprises a rotor of the embodiment, and further comprises a base 13, a stator core 14 and a winding coil arranged on the stator core 14, wherein the stator core 14 is formed by axially laminating stator punching sheets, the stator core 14 and the rotor are arranged in the base 13, and the rotor is rotatably arranged in a hollow area of the stator core 14. In this technical solution, the size of the stator core 14 in the EC permanent magnet motor is also specially designed to match the change of the rotor structure, and the coils on the stator core 14 adopt concentrated windings.

In the embodiment, the EC permanent magnet motor adopts a new rotor structure, wherein 50WW470 non-oriented silicon steel is punched by a progressive die to form a rotor punching sheet 5, and 10 radial vent holes 7 with phi of 9.8-10.3 cm are uniformly distributed on the rotor punching sheet 5, so as to cool the permanent magnet 2 (neodymium iron boron) and enable the interior of the motor to stably operate. In addition, 10 radial balance holes 8 with phi 4.2-4.8 cm are evenly distributed on the rotor punching sheet 5, so that the rotor can be balanced to 360 degrees, and the performance of the motor can be reasonably adjusted.

The rotor punching sheets 5 are stacked along the axial direction to form the rotor core 1, and when the rotor punching sheets are arranged in the EC permanent magnet motor, the motor has the characteristics of good heat dissipation performance, low noise and small vibration.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the invention, and that those skilled in the art may make variations, modifications, substitutions and alterations herein without departing from the spirit and scope of the invention.

Claims (10)

1. A rotor comprises a rotor iron core (1), a plurality of permanent magnets (2), a rotating shaft (3) and a cover plate (4); wherein, the first and the second end of the pipe are connected with each other,

the rotating shaft (3) penetrates through the rotor core (1), the permanent magnets (2) are embedded in the rotor core (1) and are arranged circumferentially, and the cover plate (4) is arranged at the end part of the rotor core (1) along the axial direction; the method is characterized in that: the rotor core (1) is formed by axially laminating a plurality of rotor punching sheets (5), the rotor punching sheets (5) are formed by punching a progressive die, and the center of each rotor punching sheet (5) is provided with a shaft hole (6) for the rotating shaft (3) to pass through; the rotor punching sheet (5) are provided with a plurality of ventilation holes (7) in the radial direction, the rotor punching sheet (5) are provided with a plurality of balance holes (8) in the radial direction, wherein the outer side of the ventilation holes (7) is located, and one ventilation hole (7) is arranged between two adjacent balance holes (8).

2. A rotor according to claim 1, wherein: the ventilation holes (7) are uniformly distributed along the same circumferential line by taking the shaft hole (6) as a center, an included angle between a connecting line from the center point of the shaft hole (6) to the hole center of the ventilation hole (7) and a connecting line from the center point of the shaft hole (6) to the hole center of the adjacent ventilation hole (7) is alpha, and the alpha is 36 degrees; the diameter of the vent hole (7) is 9.8-10.3 cm.

3. A rotor according to claim 1, wherein: the balance holes (8) are uniformly distributed along the same circumferential line by taking the shaft hole (6) as a center, an included angle between a connecting line from the center point of the shaft hole (6) to the hole center of the balance hole (8) and a connecting line from the center point of the shaft hole (6) to the hole center of the adjacent balance hole (8) is gamma, and gamma is 36 degrees; the diameter of the balance hole (8) is 4.2-4.8 cm.

4. A rotor according to claim 1, wherein: rotor punching (5) are gone up and the outside that is located balanced hole (8) radially still is equipped with a plurality of rotor grooves (9), rotor groove (9) use shaft hole (6) as center along same circumferential line evenly distributed.

5. A rotor according to claim 4, wherein: the cross section of the rotor groove (9) is a sector surface, the center point of the shaft hole (6) is used as a circular point, and a connecting line between the center point of the shaft hole (6) and the hole center of the balance hole (8) extends through the midpoint of a sector surface arc line.

6. A rotor according to claim 4, characterized in that: the lower end interval of the rotor groove (9) is 25.5-26.35 cm, the upper end interval is 28-30.06 cm, and the inner width is 5-6 cm.

7. A rotor according to claim 5, characterized in that: be equipped with between two adjacent rotor grooves (9) and separate magnetic bridge (11), the width that separates magnetic bridge (11) is 1.45 ~ 1.65cm, and extends the center point in the hole heart of ventilation hole (7) and shaft hole (6) along the central line of separating magnetic bridge (11) length direction.

8. A rotor according to claim 1, wherein: the edge of shaft hole (6) outwards extends and is equipped with counterpoint groove (12), circular arc transition between counterpoint groove (12) and shaft hole (6), the cross-section of counterpoint groove (12) is right trapezoid, two base lengths of counterpoint groove (12) are 1.6cm and 3.2cm respectively.

9. A rotor according to claim 1, wherein: the cover plate (4) comprises an upper cover plate and a lower cover plate, and hole positions corresponding to the balance holes (8) and the ventilation holes (7) are respectively formed in the upper cover plate and the lower cover plate.

10. An EC permanent magnet motor comprising a rotor as claimed in any one of claims 1 to 9, characterized in that: still include frame (13), stator core (14) and install in the winding coil of stator core (14), stator core (14) are folded by the stator punching axial and are pressed and form, stator core (14) and rotor setting are in frame (13), the rotatable setting of rotor is in the hollow region of stator core (14).

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