KR102666330B1 - Method for manufacturing rotor of lspm motor, lspm motor having rotor manufactured thereby, and rotor of lspm motor - Google Patents

Abstract

The present invention discloses a method of manufacturing a rotor of an LSPM motor. The method of manufacturing the rotor of an LSPM motor includes stacking core steel plates in the axial direction of the motor, forming a shaft groove in the axial direction into which the shaft of the motor is inserted, and a first slot into which a bar formed of a conductor is inserted, Forming a core having a second slot into which a permanent magnet is inserted, and laminating a cover steel plate on both ends of the core that communicates with the shaft groove and the first slot and is formed to cover and cover the second slot. A step of inserting a dummy shaft into the shaft groove to fix the core on which the cover steel plate is laminated, and using a mold having an end ring forming part, both sides of the bar and the cover steel plate within the core using a die casting method. integrally forming an end ring, cutting and removing at least a portion of the end ring and the cover steel plate so that the second slot is exposed to the outside, and inserting the permanent magnet into the second slot. Includes.

Description

Method for manufacturing a rotor of an LSPM motor, an LSPM motor including a rotor manufactured thereby, and a rotor of the LSPM motor {METHOD FOR MANUFACTURING ROTOR OF LSPM MOTOR, LSPM MOTOR HAVING ROTOR MANUFACTURED THEREBY, AND ROTOR OF LSPM MOTOR}

The present invention relates to a method of manufacturing a rotor used in an LSPM motor, an LSPM motor including a rotor manufactured thereby, and a rotor of the LSPM motor.

The LSPM motor (line start permanent magnet motor) has a squirrel cage structure in the rotor and is equipped with a conductor bar made of aluminum (Al) or copper (Cu) and a permanent magnet at the same time. It's a motor. These LSPM motors, unlike PMSM (Permanent Magnet Synchronous Motor) or SynRM (Synchronous Reluctance Motor), do not require a driver or inverter for operation, and have the advantage of being able to produce higher efficiency than induction motors by starting directly.

Meanwhile, manufacturing the rotor of an LSPM motor requires a process of die casting a conductor bar into the core of the rotor and storing permanent magnets. However, during die casting at 650 degrees, which is the melting point of pure aluminum, the temperature of the core rises to over 300 degrees, and when die casting with a permanent magnet inserted into the core, the permanent magnet is demagnetized due to the high temperature and no magnetic flux is generated, resulting in lower efficiency characteristics. It gets worse.

Accordingly, after die casting of the conductor bar, the permanent magnet must be stored in a slot provided in the core. At this time, all slots of the core for storing the permanent magnet must be open. However, if the die casting process of the conductor bar is performed with the core slot open, the aluminum solution blocks the open slot due to the aluminum injection pressure, making it impossible to store the permanent magnet. In addition, even when the mold used in the die casting process is provided with a slot for storing the permanent magnet, the die casting material may flow into the slot for storing the permanent magnet, which causes an increase in the defect rate of the finished rotor product.

Therefore, development of a method for manufacturing a rotor of an LSPM motor that can accommodate permanent magnets in the slots of the core after die casting of the conductor bar and can form the slots of the core into which the permanent magnets are inserted without clogging can be considered.

One object of the present invention is to provide a method for manufacturing a rotor of an LSPM motor in which the slot into which a permanent magnet is inserted in the core is not blocked even after die casting to form a conductor bar, an LSPM motor including a rotor manufactured thereby, and a circuit of the LSPM motor. It provides electrons.

In order to achieve the purpose of the present invention, a method of manufacturing a rotor of an LSPM motor according to an embodiment of the present invention includes stacking core steel plates in the axial direction of the motor, and forming a shaft groove into which the shaft of the motor is inserted in the axial direction. forming a core including a first slot into which a bar made of a conductor is inserted and a second slot into which a permanent magnet is inserted; stacking cover steel plates on both ends of the core, which communicate with the shaft groove and the first slot and are formed to cover and cover the second slot; Inserting a dummy shaft into the shaft groove to fix the core on which the cover steel plate is laminated; integrally forming end rings on both sides of the bar and the cover steel plate within the core using a die casting method using a mold having an end ring forming part; cutting and removing at least a portion of the end ring and the cover steel plate so that the second slot is exposed to the outside; and inserting the permanent magnet into the second slot.

According to an example related to the present invention, a plurality of cover steel plates may be stacked on each end of the core.

According to an example related to the present invention, the cover steel plate may be made of the same material as the core steel plate.

According to an example related to the present invention, during the die casting, a communication hole of the cover steel plate that communicates with the first slot may be filled with a metal material to form an end of the bar.

According to an example related to the present invention, a method of manufacturing a rotor of an LSPM motor includes inserting the permanent magnet into the second slot, and then attaching an annular cover formed to cover and cover the externally exposed second slot to the core. Arranging at both ends of; And it may further include the step of sequentially penetrating the annular cover and the core with a fastening member to fasten them by bolting.

According to an example related to the present invention, the annular cover may be made of a different material from the core steel plate and the cover steel plate.

An LSPM motor according to another embodiment of the present invention includes an enclosure; A stator installed within the enclosure; and a rotor configured to be rotatable within the stator and manufactured by the rotor manufacturing method of the LSPM motor.

The rotor of the LSPM motor according to another embodiment of the present invention is formed by stacking core steel plates in the axial direction of the motor, and is formed of a shaft groove into which the shaft of the motor is inserted in the axial direction and a conductor ( A core having a first slot into which a bar) is inserted and a second slot into which a permanent magnet is inserted; a cover steel plate having a ring shape and having a first slot communication hole formed to communicate with the first slot, and being laminated on both ends of the core; and end rings formed on both sides of the cover steel plate, wherein ends of the bar have the shape of the first slot communication hole and are formed integrally with the cover steel plate.

According to an example related to the present invention, the bar and the end ring may be formed integrally by a die casting method.

According to an example related to the present invention, the rotor of the LSPM motor includes an annular cover disposed at both ends of the core and formed to cover and cover the second slot; And it may further include a fastening member formed to sequentially penetrate the annular cover and the core to fasten them by bolting.

The effects of the present invention obtained through the above-described solution are as follows.

The method of manufacturing the rotor of an LSPM motor is to form a core having a first slot and a second slot by laminating core steel plates, laminating cover steel plates on both ends of the core, and inserting a dummy shaft into the shaft groove of the core to secure the core. fixed, the end ring of the rotor is integrally formed on both sides of the bar formed as a conductor in the core and the cover steel plate, a part of the end ring and cover steel plate is cut and removed to expose the second slot of the core, and the core is made of It consists of inserting a permanent magnet into a 2-slot.

According to this method of manufacturing the rotor of an LSPM motor, even after the die casting process to form the conductor bar and end ring by cover steel plates laminated on both ends of the core, the second slot of the core where the permanent magnet is stored is formed without a blocked part. can do. Accordingly, it becomes possible to store the permanent magnet in the second slot of the core after the die casting process of the conductor bar and end ring is completed. In other words, according to the method of manufacturing the rotor of the LSPM motor, the permanent magnet is not affected by the high temperature environment created during die casting. As a result, it is possible to provide a high-quality rotor by preventing the permanent magnet from deteriorating its efficiency characteristics as it is demagnetized at high temperatures.

In addition, the conductor bar and end ring can be formed integrally through a single die casting process by using an existing die casting mold that does not require a separate molding part for the second slot of the rotor core. Accordingly, the manufacturing cost of the rotor of the LSPM motor and the LSPM motor including the rotor can be significantly reduced.

1 is a flowchart of a method for manufacturing a rotor of an LSPM motor according to an embodiment of the present invention.
Figure 2 is a perspective view of a core steel plate of a rotor of an LSPM motor according to an embodiment of the present invention and a core formed by laminating the core steel plates.
FIG. 3 is a perspective view showing a cover steel plate laminated on both ends of the core shown in FIG. 2 and the cover steel plate laminated on both ends of the core.
FIG. 4 is a perspective view showing a core in which the bar and end rings are integrally formed by a die casting method, with the cover steel plates shown in FIG. 3 stacked on both ends of the core.
FIG. 5 is a perspective view showing the core shown in FIG. 4 with part of the end ring and cover steel plate cut off.
Figure 6 is a cross-sectional view of the core shown in Figure 5.
Figure 7 is a perspective view showing a rotor with a permanent magnet inserted into the second slot of the core shown in Figure 5.
FIG. 8 is a perspective view showing an LSPM motor including the rotor shown in FIG. 7.

Hereinafter, the method of manufacturing the rotor of the LSPM motor related to the present invention, the LSPM motor including the rotor manufactured thereby, and the rotor of the LSPM motor will be described in more detail with reference to the drawings.

In this specification, identical or similar reference numbers are assigned to identical or similar components even in different embodiments, and overlapping descriptions thereof are omitted.

Singular expressions include plural expressions unless the context clearly dictates otherwise.

Figure 1 is a flowchart of a method of manufacturing the rotor 100 of the LSPM motor 10 according to an embodiment of the present invention. Figure 2 is a perspective view of the core steel plate 110a of the rotor 100 of the LSPM motor 10 according to an embodiment of the present invention and the core 110 formed by stacking the core steel plates 110a. FIG. 3 is a perspective view showing the cover steel plate 120 laminated on both ends of the core 110 shown in FIG. 2 and the cover steel plate 120 laminated on both ends of the core 110. FIG. 4 shows the core 110 in which the bar 112a and the end ring 130 are formed integrally by a die casting method with the cover steel plates 120 shown in FIG. 3 stacked on both ends of the core 110. This is a perspective view showing. FIG. 5 is a perspective view showing the core 110 shown in FIG. 4 with parts of the end ring 130 and the cover steel plate 120 cut off. FIG. 6 is a cross-sectional view of the core 110 shown in FIG. 5. FIG. 7 is a perspective view showing the rotor 100 with a permanent magnet 113a inserted into the second slot 113 of the core 110 shown in FIG. 5.

1 to 7, the method of manufacturing the rotor 100 of the LSPM motor 10 involves stacking core steel plates 110a to form a core 110 having first and second slots 112 and 113. Step (S110), stacking cover steel plates 120 on both ends of the core 110 (S120), inserting a dummy shaft (not shown) into the shaft groove 111 of the core 110 to form the core 110. A step of fixing (S130), a step of integrally forming the end ring 130 on both sides of the bar and cover steel plate 120 within the core 110 (S140), the end ring 130 so that the second slot 113 is exposed. ) and a step of cutting and removing a part of the cover steel plate 120 (S150) and a step of inserting a permanent magnet 113a into the second slot 113 (S160).

First, the step (S110) of forming the core 110 having the first and second slots 112 and 113 by stacking the core steel plates 110a is performed in the axial direction of the motor 10, as shown in FIG. 2. The core steel plates 120 are stacked to form a shaft groove 111 into which the shaft 11 of the motor 10 is inserted in the axial direction of the motor 10, and a bar 112a formed of a conductor is inserted. It forms a core 110 having one slot 112 and a second slot 113 into which a permanent magnet 113a is inserted. For reference, the motor 10 and the shaft 11 are shown in FIG. 8, and FIG. 8 will be referred to together in the description of FIGS. 1 to 7.

The step (S120) of stacking the cover steel plate 120 on both ends of the core 110 is in communication with the shaft groove 111 and the first slot 112 of the core 110, as shown in FIG. Cover steel plates 120 formed to cover and cover the second slot 113 of the core 110 are stacked on both ends of the core 110. Additionally, a plurality of cover steel plates 120 may be stacked at each end of the core 110. Additionally, the cover steel plate 120 may be provided with a shaft groove communication hole 122 formed to communicate with the shaft groove 111 of the core 110.

Additionally, the cover steel plate 120 may be formed of the same material as the core steel plate 110a. For example, the cover steel plate 120 and the core steel plate 110a may be made of a silicon (Si) steel plate. The silicon steel sheet contains 1 to 4% of silicon and has good electromagnetic properties and low impurities.

In the step (S130) of fixing the core 110 by inserting a dummy shaft (not shown) into the shaft groove 111 of the core 110, the dummy shaft is inserted into the shaft groove 111 of the core 110. It is inserted into and fixes the core 110 on which the cover steel plate 120 is laminated. The dummy shaft may be sequentially inserted through the shaft groove communication hole 122 of the cover steel plate 120 and the shaft groove 111 of the core 110.

The step (S140) of integrally forming the end ring 130 on both sides of the bar 112a and the cover steel plate 120 in the core 110 is performed using a mold (not shown) having an end ring forming portion as shown in FIG. 4. Using a die casting method, end rings 130 are integrally formed on both sides of the bar 112a and the cover steel plate 120 within the core 110. The die casting method refers to a precision casting method in which copper, aluminum, tin, lead, etc. are melted and pressed into a mold made of steel. Additionally, the bar 112a and the end ring 130 may be made of aluminum (Al) or copper (Cu).

In addition, during the die casting, the communication hole 121 of the cover steel plate 120 that communicates with the first slot 112 of the core 110 is filled with the metal material used in the die casting process to form the bar 112a. Forms the end. That is, the end of the bar 112a may be formed of aluminum (Al) or copper (Cu), the same as the end ring 130.

The step (S150) of cutting and removing part of the end ring 130 and the cover steel plate 120 to expose the second slot 113 is the second slot of the core 110, as shown in FIGS. 5 and 6. At least a portion of the end ring 130 and the cover steel plate 120 are cut and removed so that the slot 113 is exposed to the outside of the core 110. The process of cutting at least a portion of the end ring 130 and the cover steel plate 120 may be performed using a CNC (Computerized Numerical Control) machine tool. Accordingly, traces of cutting may appear on one surface of both ends of the core 110.

In the step of inserting the permanent magnet 113a into the second slot 113 (S160), the permanent magnet 113a is inserted into the second slot 113 of the core 110 as shown in FIG. 7.

According to the method of manufacturing the rotor 100 of the LSPM motor 10 described above, a bar 112a and an end ring 130 formed as conductors by cover steel plates 120 laminated on both ends of the core 110 are formed. Even after the die casting process for forming, it is possible to prevent the die casting material from flowing into the second slot 113 of the core 110 where the permanent magnet 113a is stored and blocking the second slot 113. Accordingly, after the die casting process of the bar 112a and the end ring 130 is completed, it becomes possible to store the permanent magnet 113a in the second slot 113 of the core 110. That is, according to the method of manufacturing the rotor 100 of the LSPM motor 10 described above, the permanent magnet 113a is not affected by the high temperature environment formed during die casting. As a result, it is possible to provide a high-quality rotor 100 by preventing the permanent magnet 113a from deteriorating its efficiency characteristics as it is demagnetized at high temperatures.

In addition, according to the method of manufacturing the rotor 100 of the LSPM motor 10, the existing die casting mold is used as is without the need to separately provide a molding part for the second slot 113 of the core 110 of the rotor 100. Using this, the bar 112a and the end ring 130, which are made of a conductor, can be formed integrally through a single die casting process. Accordingly, the manufacturing cost of the rotor 100 of the LSPM motor 10 and the LSPM motor 10 including the rotor 100 can be greatly reduced.

Meanwhile, the rotor 100 of the LSPM motor according to an embodiment of the present invention includes a core 110, a cover steel plate 120, and an end ring 130.

The core 110 is formed by stacking core steel plates 120 in the axial direction of the motor 10, and includes a shaft groove 111 into which the shaft 11 of the motor 10 is inserted in the axial direction of the motor 10, and , It may be provided with a first slot 112 into which a bar 112a formed of a conductor is inserted, and a second slot 113 into which a permanent magnet 113a is inserted.

The cover steel plate 120 has a first slot communication hole 121 formed to communicate with the first slot 112, has a ring shape, and may be stacked on both ends of the core 110.

End rings 130 may be formed on both sides of the cover steel plate 120.

Here, the end of the bar 112a has the shape of the first slot communication hole 121, and the end of the bar 112a may be formed integrally with the cover steel plate 120.

Hereinafter, the LSPM motor 10 manufactured by the method of manufacturing the rotor 100 of the LSPM motor 10 described above will be described with reference to FIG. 8.

FIG. 8 is a perspective view showing the LSPM motor 10 including the rotor 100 shown in FIG. 7.

Referring to FIG. 8, the LSPM motor 10 includes an enclosure (not shown), a stator (not shown), and a rotor 100 manufactured by the method of manufacturing the rotor 100 of the LSPM motor 10. Includes.

The enclosure forms the exterior of the motor 10 and may be formed to surround at least a portion of the stator and rotor 100. Here, the stator may be fixed to the enclosure.

The stator may be configured to generate a rotating magnetic field by receiving electrical energy.

The rotor 100 may be placed inside the stator and rotated by a rotating magnetic field generated from the stator. Additionally, the shaft 11 of the motor 10 may be inserted into the rotor 100 and fixedly installed.

Meanwhile, the method of manufacturing the rotor 100 of the LSPM motor 10 is as shown in FIG. 7, after inserting the permanent magnet 113a into the second slot 113 of the core 110, as shown in FIG. 8. As described above, placing an annular cover 140 formed to cover and cover the second slot 113 exposed to the outside of the core 110 at both ends of the core 110, and attaching the annular cover 140 with a fastening member 150. It may further include a step of sequentially penetrating and bolting through the 140 and the core 110.

Meanwhile, the rotor 100 of the LSPM motor includes an annular cover 140 disposed at both ends of the core 110 and formed to cover the second slot 113, the annular cover 140, and the core 110. It may further include a fastening member 150 formed to sequentially pass through and perform bolting. Additionally, the core 110 may be provided with a fastening member through hole 114 through which the fastening member 150 passes and is bolted.

Additionally, the annular cover 140 may be made of a different material from the core steel plate 110a and the cover steel plate 120. For example, the annular cover 140 may be made of stainless steel, unlike the core steel plate 110a and the cover steel plate 120.

The foregoing content is merely illustrative, and various modifications may be made by those skilled in the art without departing from the scope and technical spirit of the described embodiments. The above-described embodiments can be implemented individually or in any combination.

10: LSPM motor
11: shaft
100: rotor
110: core
110a: core steel plate
111: Safthome
112: 1st slot
112a: bar
113: 2nd slot
113a: permanent magnet
114: Fastening member through hole
120: cover steel plate
130: end ring
140: welcome cover
150: fastening member

Claims (10)

Core steel plates are stacked in the axial direction of the motor, a shaft groove into which the shaft of the motor is inserted in the axial direction, a first slot into which a bar made of a conductor and formed by a die casting method is inserted, and a permanent magnet. forming a core having a second slot into which this is inserted;
laminating a cover steel plate on both ends of the core that communicates with the shaft groove and the first slot and is formed to cover the second slot so that the shape of the second slot is maintained during the die casting process;
Inserting a dummy shaft into the shaft groove to fix the core on which the cover steel plate is laminated;
integrally forming end rings on both sides of the bar and the cover steel plate within the core using the die casting method using a mold having an end ring forming part while the second slot is covered by the cover steel plate;
cutting and removing at least a portion of the end ring and the cover steel plate covering the second slot so that the second slot is exposed to the outside; and
A method of manufacturing a rotor of an LSPM motor including inserting the permanent magnet into the second slot. According to paragraph 1,
A method of manufacturing a rotor of an LSPM motor, characterized in that a plurality of cover steel plates are stacked at each end of the core. According to paragraph 1,
A method of manufacturing a rotor of an LSPM motor, wherein the cover steel plate is made of the same material as the core steel plate. According to paragraph 1,
A method of manufacturing a rotor of an LSPM motor, characterized in that during the die casting, a communication hole of the cover steel plate that communicates with the first slot is filled with a metal material to form an end of the bar. According to paragraph 1,
After inserting the permanent magnet into the second slot, placing annular covers formed to cover the externally exposed second slot at both ends of the core; and
A method of manufacturing a rotor of an LSPM motor further comprising the step of sequentially penetrating the annular cover and the core with a fastening member to fasten them by bolting. According to clause 5,
A method of manufacturing a rotor of an LSPM motor, wherein the annular cover is made of a different material from the core steel plate and the cover steel plate. enclosure;
A stator installed within the enclosure; and
An LSPM motor rotatably configured within the stator and including a rotor manufactured by the method of manufacturing a rotor of an LSPM motor according to any one of claims 1 to 6. It is formed by stacking core steel plates in the axial direction of the motor, a shaft groove into which the shaft of the motor is inserted in the axial direction, a first slot into which a bar formed of a conductor is inserted, and a first slot into which a permanent magnet is inserted. A core having 2 slots;
a cover steel plate having a ring shape and having a first slot communication hole formed to communicate with the first slot, and being laminated on both ends of the core; and
It includes end rings formed on both sides of the cover steel plate,
The end of the bar has the shape of the first slot communication hole and is formed integrally with the cover steel plate,
A rotor of an LSPM motor, characterized in that it is manufactured by the method of manufacturing a rotor of an LSPM motor according to any one of claims 1 to 6. delete delete

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