KR101767064B1 - Interior permanent magnet electric motor and compressor having the same - Google Patents

Interior permanent magnet electric motor and compressor having the same Download PDF

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Publication number
KR101767064B1
KR101767064B1 KR1020100140667A KR20100140667A KR101767064B1 KR 101767064 B1 KR101767064 B1 KR 101767064B1 KR 1020100140667 A KR1020100140667 A KR 1020100140667A KR 20100140667 A KR20100140667 A KR 20100140667A KR 101767064 B1 KR101767064 B1 KR 101767064B1
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KR
South Korea
Prior art keywords
permanent magnet
end ring
rotor core
rotor
balance weight
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KR1020100140667A
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Korean (ko)
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KR20120078383A (en
Inventor
김재민
김용대
정달호
오승석
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엘지전자 주식회사
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Priority to KR1020100140667A priority Critical patent/KR101767064B1/en
Publication of KR20120078383A publication Critical patent/KR20120078383A/en
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Publication of KR101767064B1 publication Critical patent/KR101767064B1/en

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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids

Abstract

The present invention relates to a permanent magnet insertion type electric motor and a compressor having the same. A permanent magnet insertion type electric motor according to the present invention comprises a stator and a rotor, the rotor including a rotating shaft, a rotor core, permanent magnets inserted axially into the rotor core, a weight portion coupled to an end of the rotor core, And a balance weight provided with a departure prevention portion disposed at an end portion of the permanent magnet. Thereby, it is possible to prevent the permanent magnet from being separated without increasing the manufacturing cost greatly, and to improve the efficiency and reliability.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a permanent magnet insertion type electric motor and a compressor having the permanent magnet insertion type electric motor.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent magnet insertion type electric motor and a compressor having the permanent magnet insertion type electric motor, and more particularly, to a permanent magnet insertion type electric motor and a compressor having the permanent magnet insertion type electric motor.

As is well known, an electric motor is a device that converts electrical energy into mechanical energy using a force that a current-carrying conductor receives in a magnetic field.

An electric motor can be classified into a DC motor and an AC motor according to the type of power source.

AC motors are classified into 3-phase alternating current and single-phase alternating current, and there are induction motor and synchronous motor in each.

The induction motor can be directly connected to the power source, is simple in structure and robust, and is inexpensive, easy to handle and widely used.

The induction motor may include a stator and a rotor disposed rotatably and spaced apart from the stator by a predetermined gap.

The rotor may include a rotating shaft, a rotor core coupled to the rotating shaft, a plurality of conductor bars inserted axially along the circumference of the rotor core, and an end ring shorting the conductor bar.

However, since the rotor of such an induction motor rotates with a predetermined slip during operation, the operation efficiency may be lowered.

On the other hand, in recent years, a so-called induction motor having a rotor provided with a permanent magnet together with a conductor bar has been used. This induction synchronous machine uses the cage torque of the induction machine at the time of starting and can rotate at the synchronous speed during normal operation, so that the rotation speed can be increased accordingly.

However, in such a conventional electric motor, the permanent magnet inserted in the axial direction in the rotor core can be displaced in the axial direction. As a result, the efficiency and / or reliability of the apparatus can be lowered.

In consideration of this problem, a method of fixing a permanent magnet with an adhesive (bond) or a method of combining a separate end plate for fixing the permanent magnet can be used.

However, the conventional methods of fixing the permanent magnets of the electric motor can complicate the work process, thereby decreasing the reliability, and the manufacturing cost may be increased due to the added cost.

Therefore, it is an object of the present invention to provide a permanent magnet insertion type electric motor and a compressor including the permanent magnet insertion type electric motor that can prevent the permanent magnet from being separated.

Another object of the present invention is to provide a permanent magnet insertion type electric motor and a compressor including the permanent magnet insertion type electric motor which can prevent the permanent magnet from departing without a large increase in manufacturing cost and can improve efficiency and reliability.

In order to achieve the above object, the present invention provides a stator comprising: a stator; And a rotor rotatably disposed with respect to the stator, wherein the rotor comprises: a rotating shaft; A rotor core having the rotation shaft coupled to the center thereof; A permanent magnet inserted axially into the rotor core; A balance weight eccentrically coupled to an end of the rotor core and a balance weight disposed at an end of the permanent magnet to prevent the permanent magnet from separating from the balance weight.

Wherein the rotor comprises: a plurality of conductor bars inserted axially into the rotor core; And an end ring disposed at an end of the rotor core to short-circuit the conductor bar.

The end ring can be configured such that the inner surface has the same radius.

The end ring may be configured to include a linear section whose inner surface is disposed in parallel with the permanent magnet.

The balance weight may further include a connection portion connecting the weight portion and the departure prevention portion.

The balance weight may include a fastening hole formed through the weight portion so that a fastening member coupled to the end ring can be inserted.

According to another aspect of the present invention, A compression unit disposed inside the case; And the permanent magnet insertion type electric motor which is disposed at one side of the compression section and which provides a driving force to the compression section.

Here, the rotation shaft has an eccentric portion connected to the compression portion; The balance weight may be arranged such that the center of the balance weight is spaced apart from the center of the eccentric portion by 180 degrees along the rotational direction.

As described above, according to the embodiment of the present invention, the permanent magnet can be easily and easily fixed only by the operation of attaching the balance weight without a separate fastening operation for fixing the permanent magnet.

In addition, since the detachment preventing portion for preventing the permanent magnet from separating from the balance weight is manufactured when the balance weight is manufactured, the permanent magnet can be easily fixed without increasing the manufacturing cost. Thereby, the permanent magnets can be stably fixed, and the efficiency and reliability of the motor can be improved.

Further, since the ballast weight is configured to include the weight portion, the separation preventing portion, and the connecting portion, the separation preventing portion and the connecting portion can be laterally supported by the end ring when the rotor rotates. As a result, the shearing stress of the fastening member for fastening the balance weight becomes relatively small, so that the size and / or number of fastening members can be reduced.

1 is a sectional view of a compressor including a permanent magnet insertion type electric motor according to an embodiment of the present invention,
Fig. 2 is an enlarged view of the main part of Fig. 1,
Fig. 3 is a plan view of the stator core and the rotor core of Fig. 1,
Figure 4 is a side view of the rotor of Figure 1,
5 is a cross-sectional view of the rotor of FIG. 4,
Figure 6 is a side view of Figure 4,
Fig. 7 is a perspective view of the balance weight of Fig. 5,
FIG. 8 is an exploded perspective view of a rotor of a permanent magnet insertion type electric motor according to another embodiment of the present invention, FIG.
Fig. 9 is a side view after combination of Fig. 8,
10 is a modification of the end ring of Fig.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[One]

1, a compressor according to an embodiment of the present invention includes a case 110 that forms a housing space therein, a compression unit 130 that is disposed inside the case 110 and compresses the refrigerant, And a permanent magnet insertion type electric motor 150 disposed in the case 110 and providing a driving force to the compression unit 130. [

A suction pipe 112 for sucking the refrigerant may be provided on one side of the case 110. A discharge pipe 114 for discharging the refrigerant may be provided on the suction pipe 112.

The compression unit 130 may include a fixed scroll 132 fixedly disposed in the case 110 and a orbiting scroll 135 that swirls relative to the fixed scroll 132 and compresses the refrigerant. have.

The fixed scroll 132 is provided with an involute-shaped fixed wraps 134 and the orbiting scroll 135 may be provided with an involute-shaped orbiting wrap 137 corresponding to the fixed wraps 134 . The refrigerant can be compressed while the compression space formed between the fixed lap 134 and the orbiting lap 137 is changed by the orbiting movement of the orbiting scroll 135.

An upper frame 116 may be provided in the upper portion of the case 110. The compression unit 130 may be supported on the upper side of the upper frame 116.

The permanent magnet inserting electric motor 150 may be provided below the compression unit 130.

The permanent magnet insertion type electric motor 150 may include a rotary shaft 181 having a long length.

An eccentric portion 182 may be provided at an upper end of the rotary shaft 181 to be connected to the compression portion 130. Accordingly, when the rotary shaft 181 rotates, the orbiting scroll 135 can swing with respect to the fixed scroll 132 and compress the refrigerant.

A lower frame 118 may be provided in an inner lower region of the case 110.

The upper end of the rotary shaft 181 is rotatably supported by the upper frame 116 and the lower end of the rotary shaft 181 is rotatably supported by the lower frame 118. The upper frame 116 and the lower frame 118 may be provided with bearings 117 and 119 for rotatably supporting the rotary shaft 181, respectively.

2 and 3, the permanent magnet insertion type electric motor 150 includes a stator 160 fixedly disposed inside the case 110, and a stator 160 fixed to the stator 160, (Not shown).

The stator 160 includes a stator core 161 in which a rotor receiving hole 164 is formed to receive the rotor 180 and a stator coil 171 wound on the stator core 161 .

The stator core 161 may be formed by inserting and stacking an electric steel plate 162 having the rotor receiving hole 164 formed at the center thereof and having a plurality of slots 166 and teeth 165 formed around the rotor receiving hole 164.

The rotor 180 includes a rotating shaft 181, a rotor core 191 coupled to the rotating shaft 181 at the center, a permanent magnet 210 inserted in the rotor core 191 in the axial direction, A weight portion 221 eccentrically coupled to an end portion of the rotor core 191 and a departure preventing portion 231 disposed at an end portion of the permanent magnet 210 to prevent the permanent magnet 210 from being separated from the balance portion 221. [ And a weight (220).

The rotor core 191 may have a shaft hole 194 formed at the center thereof so as to allow the rotation shaft 181 to be inserted therethrough.

The rotor 180 includes a plurality of conductor bars 200 axially inserted into the rotor core 191 at positions close to the circumference of the rotor core 191 and spaced apart in the circumferential direction, (Not shown). Thus, the electric motor 150 can use a so-called cage torque acting on the conductor bar 200 at the time of initial start-up.

The end ring 205 may be provided at both axial ends of the rotor core 191, respectively.

The rotor 180 may include a plurality of permanent magnets 210 inserted along the axial direction of the rotor core 191. Thus, the electric motor 150 can rotate at a synchronous speed during normal speed operation.

More specifically, the electric motor 150 can be driven (driven) by an induction machine that rotates by the action of attraction and repulsion by the induction current flowing in the conductor bar 200 by an electromagnetic induction action at the initial stage of starting. Since the induction current does not flow in the conductor bar 200 when the speed of the rotor 180 reaches the synchronous speed, the electric motor 150 is driven by the attraction and repulsion of the permanent magnet 210, And can be operated as a synchronous machine rotating at a high speed. Thereby, both the starting characteristics and the operation efficiency can be enhanced.

The permanent magnet insertion portion 198 may be formed in the rotor core 191 so that the permanent magnet 210 may be inserted along the axial direction of the shaft hole 194. The one end of the permanent magnet insertion portion 198 may be configured to be shut off.

The rotor core 191 may be formed by insulating a plurality of electrical steel plates 192. Each of the electric steel plates 192 of the rotor core 191 may be formed with the shaft hole 194, a conductor bar insertion hole 196 into which the conductor bar 200 is inserted, and a permanent magnet insertion portion 198. Here, the permanent magnet inserting portion 198 may not be formed in the electrical steel plate 192 disposed at one end along the axial direction. Thus, the end of the permanent magnet 210 is blocked, and the permanent magnet 210 can be prevented from being separated from the permanent magnet insertion portion 198. A flux barrier (see FIG. 8) may be provided on both sides of the permanent magnet inserting portion 198. A protrusion (see FIG. 8) protruding in the width direction may be provided between the permanent magnet inserting portion 198 and the flux barrier to prevent the permanent magnet 210 from being spaced apart.

4 to 6, a balance weight 220 may be provided at an end portion of the rotor core 191. As shown in FIG.

The balance weight 220 may be disposed on the opposite side of the eccentric portion 182 of the rotary shaft 181. That is, the force acting on the balance weight 220 is equal to the magnitude of the force generated by the eccentric portion 182 and acts in opposite directions, so that the force generated by the eccentric portion 182 can be canceled. Thus, lateral vibration of the rotary shaft 181 can be suppressed, and forced wear of the bearings 117 and 119 can be alleviated.

The balance weight 220 may be coupled to the end of the end ring 205 along the axial direction.

A plurality of fastening members 206 for fastening (fixing) the balance weight 220 may be provided at the end of the end ring 205. Here, the fastening member 206 may be composed of a plurality of boss parts protruding outward along the axial direction from the end of the end ring 205. The fastening member 206 may have a length that can protrude through the balance weight 220.

Here, the coupling member 206 is caulked after the balance weight 220 is joined to form a head portion by plastic deformation or heading of the end region of the coupling member 206 It is possible to prevent the balance weight 220 from being unintentionally separated from the end ring 205.

The size and number of the fastening members 206 can be appropriately adjusted. Also, the fastening member 206 may be formed of a bolt or a screw. That is, a female screw is formed in the end ring 205, and an insertion hole is formed in the balance weight 220 to insert a bolt into the insertion hole of the balance weight 220 so that the bolt is screwed to the female screw It is possible.

The balance weight 220 includes a weight portion 221 eccentrically coupled to an end portion of the rotor core 191 and a weight portion 221 disposed at an end portion of the permanent magnet 210 to prevent separation of the permanent magnet 210 And the prevention part 231 may be provided.

The weight portion 221 may be formed in an arc shape. The weight portion 221 may have an outer diameter corresponding to the outer diameter of the rotor core 191 and may have a substantially semicircular shape. Accordingly, the balance weight 220 can be eccentrically coupled to the rotor core 191. Although the internal angle between the opposite ends of the balance weight 220 is 180 degrees in the present embodiment, it can be adjusted appropriately (for example, 60 degrees, 90 degrees, 120 degrees, etc.) have.

The weight portion 221 may be formed with an insertion hole 222 through which the fastening member 206 can be inserted.

The separation preventing portion 231 may be disposed in contact with the end of the rotor core 191. Accordingly, the entrance of the permanent magnet inserting portion 198 is blocked, and the permanent magnet 210 can be prevented from being separated in the axial direction, that is, the opposite direction of insertion.

The release preventing portion 231 may have a shape corresponding to the inner surface shape of the end ring 205. For example, when the end ring 205 is formed in a circular shape, the release preventing portion 231 may be formed in a circular shape.

The separation preventing portion 231 may be formed with a through hole 232 into which the rotation shaft 181 is inserted. The through hole 232 may be formed to have a larger size than the rotating shaft 181. The through-hole 232 may be formed to be large within a range where the separation preventing portion 231 can block the respective openings of the permanent magnet inserting portions 198.

The balance weight 220 may include a connecting portion 241 connecting the weight portion 221 and the separation preventing portion 231. Accordingly, when the balance weight 220 is engaged, the separation preventing portion 231 is coupled to the inlet of the permanent magnet inserting portion 198 only by coupling the weight portion 221 to the end ring 205 So that deviation of the permanent magnet 210 can be prevented.

The connection portion 241 may be configured to be in contact with the inner surface (inner diameter portion) of the end ring 205. According to this configuration, the balance weight 220 can be radially supported by the end ring 205 when the rotor 180 rotates. This reduces the shear stress of the fastening member 206 that fastens the balance weight 220 to the rotor core 191, thereby reducing the size (diameter or thickness) and the number of the fastening members 206 .

The balance weight 220 is disposed at the end of the rotor core 191 when the permanent magnet 210 is inserted into the permanent magnet insertion portion 198 of the rotor core 191. [

So that the fastening member 206 provided in the rotor core 191 is inserted into the insertion hole of the balance weight 220.

When the fastening member 206 is inserted into the insertion hole, the release preventing portion 231 is inserted into the end ring 205 and contacts the end face of the rotor core 191. Accordingly, the entrance of the permanent magnet inserting portion 198 can be blocked, and the permanent magnet 210 can be prevented from being detached in the reverse direction of the inserting direction.

When the balance weight 220 is coupled, the end of the coupling member 206 inserted into the insertion hole 222 is crimped or headed to deform the balance weight 220 220) can be prevented from being unintentionally separated from the end ring (205).

[2]

Hereinafter, another embodiment of the present invention will be described with reference to FIGS. 8 to 10. FIG. The same or equivalent parts to those of the above-described embodiment will be omitted from the drawings for convenience of description, and redundant explanations of some configurations will be omitted.

As shown in Fig. 8, the permanent magnet insertion type electric motor 150 includes a stator 160; And a rotor (180) rotatably arranged with respect to the stator (160), the rotor (180) comprising: a rotating shaft (181); A rotor core 191 to which the rotation shaft 181 is coupled at the center; A permanent magnet (210) inserted into the rotor core (191) in the axial direction; A weight portion 251 eccentrically coupled to an end of the rotor core 191 and a separation preventing portion 261 disposed at an end of the permanent magnet 210 to prevent the permanent magnet 210 from being separated And a balance weight (250).

A shaft hole 194 may be formed at the center of the rotor core 191 to allow the rotation shaft 181 to be inserted therethrough.

A plurality of permanent magnet insertion portions 198 may be formed around the shaft hole 194 of the rotor core 191 so that the permanent magnets 210 may be inserted axially. A flux barrier 199 may be provided on both sides of the permanent magnet inserting portion 198. Protrusions 200 protruding in the width direction may be provided between the permanent magnet inserting portion 198 and the flux barrier 199, respectively. Whereby clearance of the permanent magnet 210 can be prevented.

The permanent magnet inserting portion 198 may be disposed in a substantially rectangular shape around the shaft hole 194.

The rotor 180 may be composed of two poles.

The rotor 180 may be configured such that two permanent magnets 210 are disposed per pole.

The rotor 180 may be configured such that the internal angle of the two permanent magnets 210 having the same magnetic pole on the side of the rotation axis 181 is 90 degrees or more.

Meanwhile, the rotor 180 may include a plurality of conductor bars 200 inserted in the axial direction of the rotor core 191 in the vicinity of the circumference of the rotor core 191.

The rotor 180 may include an end ring 245 for short-circuiting the conductor bar 200.

The end rings 245 may be formed at both ends of the rotor core 191, respectively.

8 and 9, the end ring 245 may have a circular outer diameter. The end rings 245 may be configured to have different thicknesses. The end ring 245 may have an inner surface adjacent to the permanent magnet insertion portion 198. Thus, unlike the prior art in which the thickness of the end ring in the radial direction is too thin to assemble the balance weight, the present invention allows the thickness of the end ring 245 to be relatively thick to facilitate the fastening of the balance weight 250 .

More specifically, the end ring 245 may include a straight line section 246 in which a part of the inner surface of the end ring 245 is disposed in parallel with the permanent magnet insertion section 198.

A part of the inner surface of the end ring 245 may be formed as a circular arc hollow section 247 having an arc shape. The circular arc hollow portion 247 may have the same radius from the center of the rotary shaft 181.

The inner surface of the end ring 245 may be formed symmetrically.

A fastening member 206 for fixing the balance weight 250 may be provided at an end of the end ring 245. The fastening member 206 may be composed of a plurality of fastening members.

The fastening member 206 may be configured to protrude along the axial direction from the end surface of the end ring 245.

The balance weight 250 may be formed with an insertion hole 252 through which the fastening member 206 can be inserted.

The balance weight 250 includes a weight portion 251 eccentrically coupled to an end portion of the rotor core 191 and a weight portion 251 disposed at an end portion of the permanent magnet 210 to prevent the permanent magnet 210 from being separated And a connection portion 271 connecting the weight portion 251 and the departure prevention portion 261 to each other.

The weight portion 251 may have an outer surface formed in an arc shape having the same radius at the center of the rotation axis 181. The inner surface of the weight portion 251 may be formed to correspond to the inner surface shape of the end ring 245 so as to be in contact with the inner surface of the end ring 245. The inner surface of the weight portion 251 may include a straight line portion 246.

The release preventing portion 261 may have a shape corresponding to an inner surface shape of the end ring 245. A through hole 262 may be formed in the separation preventing portion 261 to allow the rotation shaft 181 to pass therethrough.

The connecting portion 271 may have a straight line portion 272 corresponding to the inner surface shape of the end ring 245. Accordingly, the balance weight 250 can be radially supported by the end ring 245 when the rotor 180 rotates.

10, the inner surface of the end ring 275 includes a circular arc hollow portion 276 having the same radius at the center of the rotary shaft 181 and a circular arc portion 276 having a different distance from the center of the rotary shaft 181 And a curved section 277 formed to have a curved section. Here, the curved section 277 may be formed of an arc having a larger radius (radius of curvature) than the radius of the circular arc section 276.

The balance weight 280 includes a weight portion 281 having a thickness in the radial direction corresponding to the circular arc portion 276 and the curved portion 277, And a connecting portion 301 having a curved portion 302 so as to be in surface contact with the surface of the curved portion 277, Lt; / RTI >

The inner surface of the weight portion 281 may include a curved portion 282 of the center region and a circular arc portion 283 formed on both sides of the curved portion 282. The circular arc hollow portion 283 may be formed of an arc having the same radius from the center of the rotary shaft 181.

The balance weight 250 is disposed at the end of the rotor core 191 when the permanent magnet 210 is inserted into the permanent magnet inserting portion 198 of the rotor core 191. [ At this time, the fastening members 206 provided on the rotor core 191 are inserted into the insertion holes 252 of the balance weight 250, respectively.

When the coupling member 206 is inserted into the insertion hole 252, the separation preventing portion 261 is inserted into the end ring 245 and contacts the end surface of the rotor core 191, The insertion portion 198 is blocked. As a result, the permanent magnet 210 can be prevented from being displaced in the opposite direction to the inserting direction.

When the balance weight 250 is completely engaged, the end of the coupling member 206 protruded from the insertion hole 252 is plastically deformed so that the balance weight 250 is unstably moved from the end ring 245 Thereby preventing separation.

The foregoing has been shown and described with respect to specific embodiments of the invention. However, the present invention may be embodied in various forms without departing from the spirit or essential characteristics thereof, so that the above-described embodiments should not be limited by the details of the detailed description.

Further, even when the embodiments not listed in the detailed description have been described, it should be interpreted broadly within the scope of the technical idea defined in the appended claims. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

110: case 117, 119: bearing
130: compression section 132: fixed scroll
135: orbiting scroll 150: permanent magnet insertion type electric motor
160: stator 161: stator core
171: stator coil 180: rotor
181: rotation axis 182: eccentric portion
191: rotor core 196: conductor bar insertion hole
198: permanent magnet inserting part 200: conductor bar
205: end ring 206: fastening member
210: permanent magnet 220: balance weight
221: weight portion 222: insertion hole
231: Departure preventing portion 232: Through hole
241:

Claims (8)

Stator; And
And a rotor rotatably disposed on the stator,
The rotor comprising:
A rotating shaft;
A rotor core having the rotation shaft coupled to the center thereof;
A permanent magnet inserted axially into the rotor core;
A plurality of conductor bars inserted axially into the rotor core;
An end ring disposed at an end of the rotor core to short-circuit the conductor bar;
A balance weight provided at an end of the rotor core; And
And a fastening member for fastening the balance weight to an end of the rotor core,
The balance weight,
A weight portion eccentrically coupled to an end of the end ring;
A separation preventing portion disposed at an end of the permanent magnet inside the end ring to prevent the permanent magnet from being separated from the end ring; And
And a connection portion provided on the inner side of the end ring and connecting the weight portion to the separation preventing portion. The method according to claim 1,
The fastening member is formed to protrude axially from an end of the end ring,
And an insertion hole into which the coupling member is inserted is formed through the weight portion. 3. The method of claim 2,
Wherein the fastening member is caulked or formed with a head portion after the insertion hole is engaged, so that the separation is suppressed. The method according to claim 1,
Wherein the end ring includes a linear section whose inner surface is disposed in parallel with the permanent magnet,
Wherein the connecting portion includes a linear section corresponding to an inner surface shape of the end ring. The method according to claim 1,
Wherein the end ring has a curved section having a different distance from the center of the rotating shaft,
Wherein the connecting portion has a curved section corresponding to an inner surface shape of the end ring. The method according to claim 1,
An insertion hole into which the fastening member is inserted is formed through the weight portion,
Wherein the end ring is formed with a female screw so that the fastening member can be screwed into the end ring. case;
A compression unit disposed inside the case; And
And a permanent magnet insertion type electric motor according to claim 1, which is disposed on one side of the compression portion and provides a driving force to the compression portion. 8. The method of claim 7,
Wherein the rotary shaft has an eccentric portion connected to the compression portion;
Wherein the center of gravity of the balance weight is arranged to be 180 degrees apart from the center of the eccentric portion in the rotational direction.
KR1020100140667A 2010-12-31 2010-12-31 Interior permanent magnet electric motor and compressor having the same KR101767064B1 (en)

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Citations (1)

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Publication number Priority date Publication date Assignee Title
KR100524706B1 (en) * 2003-03-04 2005-11-01 엘지전자 주식회사 Rotor for line-start permanent magnet motor and manufacture method thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100524706B1 (en) * 2003-03-04 2005-11-01 엘지전자 주식회사 Rotor for line-start permanent magnet motor and manufacture method thereof

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