WO2019085499A1

WO2019085499A1 - Rotor core

Info

Publication number: WO2019085499A1
Application number: PCT/CN2018/091611
Authority: WO
Inventors: 倪祖根
Original assignee: 莱克电气股份有限公司
Priority date: 2017-11-01
Filing date: 2018-06-15
Publication date: 2019-05-09
Also published as: CN113691041A; CN107733111A

Abstract

A rotor core (1), comprising at least one closed rotor sheet group and at least one open rotor sheet group. The closed rotor sheet group and the open rotor sheet group are alternately stacked in the axial direction. The rotor core (1) can improve the output performance of a rotor, and can also further enhance the structural stability of the rotor; the advantages of an open rotor and a closed rotor are combined, and the respective deficiencies thereof are avoided; the rotor core (1) can be widely used.

Description

Rotor core

Technical field

The invention relates to the field of electric machines, and in particular to a rotor core.

Background technique

A motor is an electromagnetic device that realizes electric energy conversion or transmission according to the law of electromagnetic induction. Its main function is to generate driving torque as a power source for electric appliances or various machines. Motors can be divided into DC motors, asynchronous motors, and synchronous motors according to their structure and working principle. Synchronous motors usually include permanent magnet synchronous motors, reluctance synchronous motors, and magnetic tape synchronous motors.

The permanent magnet slots of the embedded permanent magnets on the existing market have two structures on the radial outer side, one is open type, the other is fully enclosed and closed type, and the advantages and disadvantages of the open rotor and the closed rotor are It is obvious that under the same conditions, the open rotor has good performance, the maximum output is high, and the maximum output is 30% higher than that of the closed rotor. However, the open core structure has low strength, and the iron core may be deformed during transportation or handling. The original unbalance of the rotor is large, and the open rotor has poor stability at high speed. As a result, the noise of the closed rotor is 3~5Db when the motor of its structure type is running at high speed; and the closed rotor has good stability and noise. However, its output capability is not as good as that of an open rotor.

In view of this, it is necessary to develop a rotor core to solve the above problems.

Summary of the invention

In view of the deficiencies in the prior art, an object of the present invention is to provide a rotor core which can further enhance the structural stability of the rotor while improving the output capability of the rotor, taking into account the open rotor and the closed type. The advantages of the rotor, while at the same time circumventing their respective deficiencies, have a wider application prospect.

In order to achieve the above object and other advantages in accordance with the present invention, a rotor core is provided, comprising:

At least one set of closed rotor punch sets;

At least one set of open rotor punch sets,

Wherein, the closed rotor punching set and the open rotor punching set are alternately stacked in the axial direction.

Preferably, the rotor core holds a closed rotor chip set between a plurality of open rotor chip sets.

Preferably, the closed rotor chip set comprises a plurality of closed rotor blades stacked in sequence in the axial direction, each of the closed rotor blades comprising:

Closed punch body;

a first through hole formed in the closed punch body and a plurality of first permanent magnet slots,

Wherein, the first through hole is disposed at a rotation center of the closed punch body, and the plurality of first permanent magnet grooves are radially arranged in a circumferential direction of the closed punch body, and the adjacent two first permanent magnet slots are defined to be located a first magnetic pole between the two, a first inner magnetic bridge is formed between the inner end of the first permanent magnet slot and the first through hole, and the outer end of the first permanent magnet slot and the outer periphery of the closed punch body An outer magnetic bridge is formed therebetween, and a plurality of closed rotor punches are combined with each other to form a rigid whole.

Preferably, the open rotor punching set comprises a plurality of open rotor punching sheets which are sequentially stacked in the axial direction, and each of the open rotor punching sheets comprises:

Open punch body; and

a second through hole formed in the open punch body and a plurality of second permanent magnet slots,

Wherein, the second through hole is disposed at a rotation center of the open punch body, and the plurality of second permanent magnet grooves are radially arranged in a circumferential direction of the open punch body, and the adjacent two second permanent magnet slots are defined to be located a second magnetic pole between the two, a second inner magnetic bridge is formed between the inner end of the second permanent magnet slot and the second through hole, and the outer end of the second permanent magnet slot is connected to the magnetic isolation path to the outside A plurality of open rotor blades are combined to form a rigid unit.

Preferably, the plurality of sets of the closed rotor punching set and the plurality of sets of open rotor punching sets are alternately axially combined into a rigid unit such that the first through hole and the second through hole communicate with each other to form a rotating shaft. The rotating shaft through hole, and the first permanent magnet slot and the second permanent magnet slot communicate with each other to form a permanent magnet mounting groove for mounting the permanent magnet.

Preferably, at least one first shoulder portion is formed on a circumferential end surface of the first permanent magnet groove; and at least one second shoulder portion is formed on a circumferential end surface of the second permanent magnet groove.

Preferably, the first shoulder is convex at a right angle along the inner side of the first permanent magnet slot such that the outer end of the first permanent magnet slot is formed with a first outer magnetic flux slot; the second shoulder is along the second permanent magnet slot The inner protrusion is at a right angle such that the outer end of the second permanent magnet slot is formed with a second outer magnetic flux.

Preferably, the first shoulder portion (1121) is provided with two symmetrical formations on the circumferential end faces of the first permanent magnet slots (112); the second shoulder portion (1221) is provided with two symmetrical portions. The ground is formed on the circumferential end faces on both sides of the second permanent magnet slot (122).

Preferably, the inner end of the first permanent magnet groove is formed with a first inner magnetic separation groove, and the inner end of the second permanent magnet groove is formed with a second inner magnetic separation groove.

Preferably, the width of the first inner magnetic separation groove in the circumferential direction is larger than the circumferential width of the first permanent magnetic groove, and the width of the second inner magnetic separation groove in the circumferential direction is larger than the circumferential direction of the second permanent magnetic groove. Width size.

Preferably, the radially inner end surface of the first inner magnetic separation groove is formed with an inner top end which is convex outward in the radial direction.

Preferably, the radially inner end surface of the second inner magnetic separation groove is formed with a groove recessed in the radial inner side.

Compared with the prior art, the invention has the beneficial effects of improving the rotor output capacity and further enhancing the structural stability of the rotor, taking into consideration the advantages of the open rotor and the closed rotor, and avoiding both of them. Their respective shortcomings have broad application prospects.

DRAWINGS

Figure 1 is a perspective view of a rotor core according to the present invention;

Figure 2 is a plan view of a closed rotor punch in a rotor core according to the present invention;

3 is a top plan view of an open rotor die in a rotor core in accordance with the present invention.

Description of the reference signs:

1-rotor core;

11-closed rotor punching, 12-open rotor punching, 13-blocking magnetic flux hole;

111-first through hole, 112-first permanent magnet slot, 113-first inner magnetic bridge, 1114-first magnetic pole

115-outer magnetic bridge, 116-first outer magnetic air bridge, 117-first inner magnetic air bridge, 118-closed punch body;

121-second through hole, 122-second permanent magnet slot, 123-second inner magnetic bridge, 1214-second magnetic pole

125-magnetic isolation path, 126-second outer magnetic air bridge, 127-second inner magnetic air bridge, 128-open punch body;

1121-first shoulder, 1171-inner top tight end;

1221-second shoulder, 1271-groove.

Detailed ways

The above and other objects, features, aspects and advantages of the present invention will become more apparent from In the figures, the shapes and dimensions may be exaggerated for clarity, and the same reference numerals will be used throughout the drawings to refer to the same or. In the following description, terms such as front, back, rear, left, right, top, bottom, upper, lower, etc. are only for the structural assignments as shown in FIGS. 1 to 3. In particular, "height" corresponds to the size from top to bottom, "width" corresponds to the size from left to right, and "depth" corresponds to the size from front to back. These relative terms are for convenience of description and are generally not intended to require a particular orientation. Terms relating to attachment, coupling, etc. (eg, "connected" and "attached") refer to a relationship in which the structures are directly or indirectly fixed or attached to each other through an intermediate structure, and a movable or rigid attachment or relationship, unless Other ways are clearly stated.

Referring to Figure 1, the rotor core 1 comprises:

At least one set of closed rotor punch sets;

At least one set of open rotor punch sets,

In an embodiment of the present application, the rotor core 1 holds a closed rotor chip set between a plurality of open rotor chip sets.

As shown in FIG. 2, the closed rotor chip set includes a plurality of closed rotor blades 11 which are sequentially stacked in the axial direction, and each of the closed rotor blades 11 includes:

a closed punch body 118;

a first through hole 111 formed in the closed punch body 118 and a plurality of first permanent magnet slots 112,

Wherein, the first through hole 111 is disposed at a rotation center of the closed punch body 118, and the plurality of first permanent magnet grooves 112 are radially arranged in a circumferential direction of the closed punch body 118, and the adjacent two first permanent magnets The slot 112 defines a first magnetic pole 114 between the two, and a first inner magnetic bridge 113 is formed between the inner end of the first permanent magnet slot 112 and the first through hole 111, and the first permanent magnet slot 112 is outside. The outer end is formed with an outer magnetic bridge 115, and a plurality of closed rotor blades 11 are combined with each other to form a rigid unit.

As shown in FIG. 3, the open rotor chip set includes a plurality of open rotor blades 12 which are sequentially stacked in the axial direction, and each of the open rotor blades 12 includes:

Open punch body 128;

a second through hole 121 formed in the open punch body 128 and a plurality of second permanent magnet slots 122,

Wherein, the second through hole 121 is disposed at a rotation center of the open punch body 128, and the plurality of second permanent magnet grooves 122 are radially arranged in a circumferential direction of the open punch body 128, and adjacent two second permanent magnets The slot 122 defines a second magnetic pole 124 between the two ends. The second inner permanent magnet bridge 123 is formed between the inner end of the second permanent magnet slot 122 and the second through hole 121. The end is connected with a magnetic isolation passage 125 to the outside, and a plurality of open rotor blades 11 are combined with each other to form a rigid whole. In a preferred embodiment, the first permanent magnet slot 112 and the second permanent magnet slot 122 are respectively uniformly disposed in the circumferential direction, and the first magnetic pole 114 and the second magnetic pole 124 are uniformly disposed in the circumferential direction. 8. The first inner magnetic bridge 113 and the second inner magnetic bridge 123 restrict the permanent magnet from pulsing radially inward, and the outer magnetic bridge 115 can prevent the rotor core from pulsing radially outward during the pivoting process, thereby ensuring The rotational stability of the rotor core also reduces the rotational noise, and the magnetic isolation path 125 acts as a magnetic flux barrier between the permanent magnet and the outside, which prevents the magnetic flux from leaking, thereby increasing the maximum output power. Typically, rotor blanks are typically made of silicon steel sheets or silicon steel sheets.

As shown in FIG. 1 to FIG. 3, a plurality of sets of the closed rotor punching set and a plurality of sets of open rotor punching sets are alternately combined in the axial direction to form a rigid whole, such that the first through hole 111 and the second through hole 121 are formed. The mutually communicating shafts form a shaft through hole for mounting the rotating shaft, and the first permanent magnet slot 112 and the second permanent magnet slot 122 communicate with each other to form a permanent magnet mounting groove for mounting the permanent magnet.

Usually, the permanent magnet grooves are arranged in a rectangular structure extending in the radial direction, and accordingly, the permanent magnets are also arranged in a rectangular structure adapted thereto. In a preferred embodiment, the first permanent magnet slot 112 and the second permanent magnet slot 122 are disposed in a trapezoidal structure, and the sizes of the two are uniform. Accordingly, the permanent magnet is also disposed in a trapezoidal structure corresponding thereto, and further The ratio of the circumferential width of the inner end of the first permanent magnet groove 112 to the circumferential width of the outer end of the first permanent magnet groove 112 is 1:0.85. Preferably, the width dimension of the first permanent magnet slot 112 in the circumferential direction and the width dimension of the second permanent magnet slot 122 in the circumferential direction gradually decrease as the radius expands. The trapezoidal structure enables the permanent magnet to be gradually tightened by the circumferential end surface of the permanent magnet slot under the centrifugal force in the permanent magnet slot, thereby preventing the inner and outer radial sway of the permanent magnet, further ensuring the rotor core. Rotational stability.

Referring to the partially enlarged regions in FIG. 2 and FIG. 3, at least one first shoulder portion 1121 is formed on the circumferential end surface of the first permanent magnet slot 112, and a circumferential end surface of the second permanent magnet slot (122) is formed on the circumferential end surface. At least one second shoulder 1221. In a preferred embodiment, the first shoulder portion 1121 and the second shoulder portion 1221 are each provided with two.

Further, the first shoulder portion 1121 is raised at a right angle along the inner side of the first permanent magnet slot 112 such that the outer end of the first permanent magnet slot 112 is formed with a first outer magnetic isolation groove 116, and the second shoulder portion 1221 is along the first The inner protrusion of the two permanent magnet slots 122 is at a right angle such that the outer end of the second permanent magnet slot 122 is formed with a second outer magnetic isolation groove 126. The first outer magnetic isolation groove 116 and the second outer magnetic separation groove 126 serve as an outer magnetic flux barrier, which can further prevent leakage of the magnetic flux on the radially outer end, thereby improving energy conversion efficiency.

In an embodiment of the invention, the outer magnetic isolation groove 116 is injection molded with a non-magnetically permeable injection molded body for reinforcing the magnet in the permanent magnet groove 112.

Referring to FIGS. 2 and 3, the inner end of the first permanent magnet groove 112 is formed with a first inner magnetic isolation groove 117, and the inner end of the second permanent magnet groove 122 is formed with a second inner magnetic separation groove 127. Further, a width dimension of the first inner magnetic isolation groove 117 in the circumferential direction is larger than a width dimension of the first permanent magnet groove 112 in the circumferential direction, and a width dimension of the second inner magnetic isolation groove 127 in the circumferential direction is larger than the second permanent magnet groove 122. The width dimension along the circumference. The first inner magnetic isolation groove 117 and the second inner magnetic separation magnetic groove 127 serve as internal magnetic flux barriers, which can further prevent leakage of magnetic flux at the radially inner end, thereby improving energy conversion efficiency, and at the same time, due to the permanent magnet slot at the inner end The distance between the two adjacent magnets is small, which easily causes the magnetic flux generated by two adjacent permanent magnets to affect each other in the vicinity of the inner end. Therefore, the width dimension of the inner magnetic flux groove in the circumferential direction is larger than the width dimension of the permanent magnet groove along the circumferential direction. This effect prevents the magnetic flux from interfering with each other and has a weakening effect, thereby increasing the output power of the rotor core.

In an embodiment of the invention, the first inner magnetic isolation groove 117 and the second inner magnetic separation groove 127 are injection molded with a non-magnetically permeable injection molded body for reinforcing the magnet in the permanent magnet groove 112.

Referring to FIGS. 2 and 3, the radially inner end surface of the first inner magnetic isolation groove 117 is formed with an inner top end end 1171 which is convex outward in the radial direction, and a radial end surface of the second inner magnetic separation groove 127 is formed with a radial path. A groove 1271 that is recessed toward the inside. In a preferred embodiment, the inner top end 1171 enables the permanent magnet to be sufficiently supported at the inner end of the permanent magnet slot 112. The groove 1271 can enlarge the volume of the second inner magnetic isolation groove 127, thereby improving the magnetic isolation capability and further preventing magnetic flux leakage. With this structure, the permanent magnet can be restrained by the radial limitation of the first shoulder portion 1121, the second shoulder portion 1221 and the inner top end portion 1171, thereby greatly improving the stability of the permanent magnet in the permanent magnet slot when the rotor rotates. Further, by providing the outer barrier bridge 115, the overall stability of the magnetic pole is improved, and at the same time, the magnetic isolation capability at the radially outer end of the permanent magnet is increased by opening the magnetic isolation passage 125, thereby increasing the maximum output power of the rotor.

Assume that the number of sets of closed rotor punch sets is a, the number of open rotor punch sets is b, and the number of closed rotors in each set of closed rotor sets is x, each set of open rotor punches The number of open rotors in the set is y, then a≥1, b≥1, x≥1, y≥1. In one embodiment, a=b=x=y=1, the closed rotor chip is assembled above the open rotor chip set, and the magnetic isolation path 125 on the single open rotor plate forms the rotor core. 8 magnetic flux leakage holes 13 on the outer end surface. As shown in FIG. 1, in a preferred embodiment, a=7, b=14, x=1, y=4, the rotor core 1 is arranged in order from top to bottom in the following structure: the first group of open rotors Punching set - first set of closed rotor punching sets - second set of open rotor punching sets - third set of open rotor punching sets - second set of closed rotor blanking sets - fourth set of open rotors Punching set - Group 5 open rotor punching set - Group 3 closed rotor punching set - Group 6 open rotor punching set - Group 7 open rotor punching set - Group 4 closed rotor Punching set - Group 8 open rotor punching set - Group 9 open rotor punching set - Group 5 closed rotor punching set - Group 10 open rotor punching set - Eleventh open type Rotor Punch Set - Group 6 Closed Rotor Punch Set - Twelfth Group Open Rotor Punch Set - Thirteen Group Open Rotary Punch Set - Seventh Group Closed Rotor Punch Set - Fourteenth Group of open rotor punching sets.

The above are only a few embodiments of the present invention, and the skilled person can use the closed rotor punching piece and the open rotor punching piece of the present invention to be stacked in the axial direction in any order according to design requirements.

The number of devices and processing scales described herein are intended to simplify the description of the present invention. Applicability, modifications, and variations of the present invention will be apparent to those skilled in the art.

Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the embodiments, and are fully applicable to various fields suitable for the present invention, and can be easily made by those skilled in the art. The invention is not limited to the specific details and the details shown and described herein, without departing from the scope of the appended claims.

Claims

A rotor core (1), comprising:

At least one set of closed rotor punch sets;

At least one set of open rotor punch sets,

Wherein, the closed rotor punching set and the open rotor punching set are alternately stacked in the axial direction.
The rotor core (1) according to claim 1, characterized in that the rotor core (1) holds a closed rotor chip set between a plurality of open rotor chip sets.
A rotor core (1) according to claim 2, wherein said closed rotor chip set comprises a plurality of closed rotor blades (11) which are sequentially stacked in the axial direction, each of which is closed rotor The film (11) includes:

a closed punch body (118);

a first through hole (111) and a plurality of first permanent magnet slots (112) formed on the closed punch body (118),

Wherein, the first through hole (111) is disposed at a rotation center of the closed punch body (118), and the plurality of first permanent magnet grooves (112) are radially arranged in a circumferential direction of the closed punch body (118). Two adjacent first permanent magnet slots (112) define a first magnetic pole (114) between the two, and an inner end of the first permanent magnet slot (112) is formed between the inner end and the first through hole (111). The first inner magnetic bridge (113), the outer end of the first permanent magnet slot (112) and the outer periphery of the closed punch body (118) are formed with an outer magnetic bridge (115), and a plurality of closed rotors are punched. The sheets (11) are combined with each other to form a rigid unit.
A rotor core (1) according to claim 3, wherein said open rotor die set comprises a plurality of open rotor blades (12) stacked in the axial direction, each open rotor punching The film (12) includes:

Open punch body (128);

a second through hole (121) and a plurality of second permanent magnet slots (122) formed on the open punch body (128),

Wherein, the second through hole (121) is disposed at a rotation center of the open punch body (128), and the plurality of second permanent magnet grooves (122) are radially arranged in a circumferential direction of the open punch body (128). Two adjacent second permanent magnet slots (122) define a second magnetic pole (124) therebetween, and an inner end of the second permanent magnet slot (122) is formed between the inner end and the second through hole (121) The second inner magnetic bridge (123), the outer end of the second permanent magnet slot (122) communicates with a magnetic isolation passage (125) to the outside, and the plurality of open rotor blades (11) are combined with each other to form a rigid whole.
A rotor core (1) according to claim 4, wherein a plurality of said closed rotor blank sets and a plurality of sets of open rotor blank sets are alternately axially combined into a rigid unit such that the first The through hole (111) and the second through hole (121) communicate with each other to form a rotating shaft through hole for mounting the rotating shaft, and the first permanent magnet groove (112) and the second permanent magnet groove (122) communicate with each other for installation. Permanent magnet mounting groove for the magnet.
The rotor core (1) according to claim 4, wherein at least one first shoulder portion (1121) is formed on a circumferential end surface of the first permanent magnet groove (112); and the second permanent magnet groove ( At least one second shoulder (1221) is formed on the circumferential end surface of 122).
The rotor core (1) according to claim 6, wherein the first shoulder portion (1121) is convex at a right angle along an inner side of the first permanent magnet groove (112) such that the first permanent magnet groove (112) The outer end of the second outer magnetic groove (116) is formed at the outer end of the second permanent magnet groove (122) so that the second permanent magnet groove (122) The outer end is formed with a second outer magnetic separation groove (126).
The rotor core (1) according to claim 6, wherein the first shoulder portion (1121) is provided with two symmetrically formed on the circumferential end faces on both sides of the first permanent magnet slot (112); The second shoulder portion (1221) is provided with two symmetrical formations on the circumferential end faces on both sides of the second permanent magnet groove (122).
The rotor core (1) according to claim 4, wherein the inner end of the first permanent magnet groove (112) is formed with a first inner magnetic separation groove (117), and the second permanent magnetic groove (122) The inner end is formed with a second inner magnetic groove (127).
The rotor core (1) according to claim 9, wherein a width dimension of the first inner magnetic isolation groove (117) in the circumferential direction is larger than a width dimension of the first permanent magnet groove (112) in the circumferential direction, The width dimension of the two inner magnetic isolation grooves (127) in the circumferential direction is larger than the width dimension of the second permanent magnet grooves (122) in the circumferential direction.
A rotor core (1) according to claim 10, wherein the radially inner end surface of the first inner magnetic isolation groove (117) is formed with an inner top end (1171) projecting outward in the radial direction.
A rotor core (1) according to claim 10, wherein a groove (1271) recessed in the radial inner side is formed on a radial end surface of the second inner magnetic separation groove (127).