KR20120068497A - Interior permanent magnet type brushless direct current motor and compressor having the same - Google Patents

Abstract

PURPOSE: A permanent magnet insertion type brushless DC motor and a compressor including the same are provided to reduce torque ripples for suppressing noise and vibration. CONSTITUTION: A permanent magnet insertion part(191) is formed on the circumference of a shaft hole(175) for inserting a permanent magnet(190) in an axial direction. A coupling part insertion hole(177) is formed in outside the shaft hole. A penetration hole(178) is formed in outside the shaft hole in order to pass a fluid. A rotor core is formed by laminating the shaft hole and a plurality of electric steel plates which has the permanent magnet insertion part. The rotor core comprises a perfectly circular part(181) which has the same radius from the center of a shaft and a non-circular part(185). The non-circular part has a maximum cutting depth from a q-axis.

Description

Permanent Magnet Insertion Bieldi Motor and Compressor Equipped with It {INTERIOR PERMANENT MAGNET TYPE BRUSHLESS DIRECT CURRENT MOTOR AND COMPRESSOR HAVING THE SAME}

The present invention relates to a permanent magnet insertion type BCD motor and a compressor having the same. More particularly, the permanent magnet insertion can improve the efficiency of the motor and reduce the torque ripple to suppress noise and vibration. It relates to a formula Bieldi motor and a compressor having the same.

As is well known, a motor can be classified into a direct current motor and an alternating current motor according to its use power source.

Conventional direct current motor is composed of a commutator and a brush, due to the mechanical contact between the commutator and the brush has a disadvantage in that the reliability is reduced and the life is shortened.

Recently, in consideration of mechanical contact problems, a so-called brushless DC motor (BLDC motor) of an electronic switching method using a semiconductor device has been widely used.

Such brushless motors may be classified into an interior rotor type and an exterior rotor type according to the arrangement of the stator and the rotor.

In the electric motor, a rotor in which a shaft is inserted into a center of a cylindrical permanent magnet is used, or a so-called IPPM type in which a shaft is inserted into a center of a rotor core in which electrical steel sheets are stacked and a plurality of permanent magnets are inserted into the rotor core. A permanent magnet insert rotor called an interior permanent magnet type is used.

The permanent magnet insertion rotor, a shaft hole is formed so that the shaft can be inserted in the center, a plurality of circular electrical steel sheet through which the permanent magnet insertion portion is inserted so that a plurality of permanent magnets can be inserted along the axial direction around the shaft hole It is provided with the insulation laminated core.

Meanwhile, flux barriers may be formed in both end regions of each permanent magnet to prevent leakage of the magnetic flux of each permanent magnet in the permanent magnet inserting rotor.

By the way, in the conventional permanent magnet insertion type BMD motor, the torque ripple is relatively large, thereby causing a relatively large vibration and noise.

On the other hand, some of the conventional permanent magnet insertion type BCD motors adopt a method of adjusting (tuning) the shape of the flux barrier and / or the circumference near the q-axis to reduce torque ripple.

By the way, some of the methods of adjusting (tuning) the flux barrier and / or the circumferential shape near the q-axis, the excessive strength of the flux barrier and / or the q-axis circumferential shape, weaken the strength of the rotor, Increasing speed may cause deformation and damage.

In addition, since excessive edges or attachments are formed in one region of the rotor flux barrier, excessive stress concentration may occur in the edge forming region of the rotor mold, thereby shortening the life of the mold. have. Due to this, the manufacturing cost may increase and the mass productivity may decrease.

Accordingly, an object of the present invention is to provide a permanent magnet insertion type BCD motor and a compressor having the same, which can improve the efficiency of the motor and reduce the torque ripple to suppress vibration and noise.

In addition, another object of the present invention is to provide a permanent magnet insertion type BLD motor and a compressor having the same, which can ensure the rigidity of the rotor while having mass productivity and enable high speed rotation.

The present invention provides a stator core having a plurality of slots and teeth, and a stator coil wound around the teeth. And a rotor having a shaft, a rotor core coupled to the shaft, and a plurality of permanent magnets axially inserted into the rotor core, wherein the rotor core has: the same radius at the center of the shaft, d A garden portion formed symmetrically about an axis; And a non-garden part which is symmetrical about the q axis and is gradually cut along the circumferential direction from one end of the garden part and has a maximum cutting depth on the q axis. Provided is a permanent magnet insertable Bildish motor, characterized in that alternately arranged.

Here, when the number of poles of the rotor is P, the d-axis and the inner angle θ of one end may be configured to have a range of (30 ° ~ 90 °) / P.

The rotor may be configured such that a ratio (A: D) of the maximum cutting depth A of the non-garden part to the outer diameter D of the rotor is 0.01 to 0.04.

The non-garden part has a straight section extending in a straight line at the point of maximum cutting depth, the straight section is symmetrical with respect to the q-axis, and the one-sided straight section and the q-axis have an internal angle of 60 ° to 80 °. Can be.

The rotor core may include a permanent magnet inserting portion for inserting the permanent magnets, and the permanent magnet inserting portion may be formed so that two permanent magnets having different magnetic poles may be symmetrically disposed with respect to the q axis.

The permanent magnet inserting portion may be formed such that two permanent magnets having the same magnetic pole are disposed symmetrically with respect to the d-axis.

The rotor may be configured such that the value of the ratio B: D to the rotor outer diameter D of the shortest distance B of two permanent magnets having different magnetic poles is 0.02 to 0.035.

The permanent magnet has a rectangular cross section, the end portion of the permanent magnet insert may be configured to have a parallel portion disposed in parallel with the straight section.

The rotor may be configured such that the value of the ratio C: D to the rotor outer diameter D of the distance C between the straight section and the parallel part is 0.006 to 0.010.

The parallel portion extends from one long side portion of the permanent magnet insertion portion, and an end portion of the permanent magnet insertion portion is connected to an end portion of the parallel portion and the other long side portion of the permanent magnetic insertion portion, and to a boundary between the parallel portion and the connection portion. It may be configured to further include an arc formed.

The stator core may have nine slots, and the rotor may have six poles.

The stator coil may be composed of a concentrated zone.

The non-garden part may further include a curved section extending from one end of the garden section to the straight section.

The non-garden part may include two curved sections intersecting each other on the q-axis and symmetrical to the q-axis, and a round part formed by an arc contacting the two curved sections, so that the cutting depth is gradually increased at one end of the garden portion. It can be configured to include.

Here, the one side curved section and the q-axis may be composed of an internal angle of 60 ° to 80 °.

On the other hand, according to another field of the present invention, there is provided a compressor having the permanent magnet insertion type BCD motor.

As described above, according to one embodiment of the present invention, the torque ripple can be reduced by sineating the magnetic flux density of the voids. As a result, vibration and noise caused by torque ripple can be suppressed.

In addition, according to one embodiment of the present invention can reduce the leakage flux of the q-axis to improve the efficiency of the motor.

In addition, according to an embodiment of the present invention it is possible to ensure the rigidity of the rotor while having mass productivity. As a result, deformation of the rotor and occurrence of damage can be suppressed. In addition, even if the stator coil is configured in a concentrated winding manner which is advantageous for relatively low speed operation, relatively high speed rotation (approximately 9000 rpm) is possible.

1 is a cross-sectional view of a compressor having a permanent magnet insertion type BCD motor according to an embodiment of the present invention;
FIG. 2 is a plan view of a coupled state of the stator core and the rotor core of FIG. 1;
3 is an enlarged partial view of the rotor core of FIG.
4 is an enlarged view illustrating main parts of FIG. 3;
5 is a view showing a relationship between the cabinet and the torque ripple of the garden portion of FIG.
6 is a view showing the relationship between the maximum cutting depth and the torque ripple of the non-garden part of FIG.
7 is a view illustrating a relationship between an internal angle of the non-garden part of FIG. 3 and torque ripple;
FIG. 8 is a diagram illustrating a relationship between a shortest distance, a safety factor, and a torque of the permanent magnet of FIG. 4;
FIG. 9 is a view illustrating a relationship between a distance between a non-garden part of FIG. 4 and a permanent magnet insert, safety factor, and torque;
10 is an enlarged view of a garden portion and a non-garden portion of a rotor core of a permanent magnet insertable BILD motor according to another embodiment of the present invention;
11 is an enlarged view illustrating main parts of FIG. 10.

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

[One]

As shown in FIG. 1, a compressor including a permanent magnet insertion type BLD motor according to an exemplary embodiment of the present invention may include a case 110 forming an accommodation space therein and an inside of the case 110. And a compression unit 120 for compressing the refrigerant, and a permanent magnet insertion type BCD motor 130 for providing a driving force to the compression unit 120.

One side of the case 110 may be provided with a suction tube 112 for sucking the coolant and a discharge tube 114 for discharging the coolant.

The compression unit 120 may be provided in an inner upper region of the case 110.

The compression unit 120 may include a fixed scroll 122 that is fixedly arranged, and a rotating scroll 125 that compresses the refrigerant while pivoting with respect to the fixed scroll 122. The fixed scroll 122 may be provided with an involute shaped wrap 124, and the orbiting scroll 125 may be provided with an involute shaped wrap 127.

The main frame 116 may be provided in the upper upper region of the case 110.

The subframe 118 may be provided in an inner lower region of the case 110.

The mainframe 116 and the subframe 118 may be fixed to the case 110, respectively.

The compression unit 120 may be supported by the main frame 116.

The permanent magnet insertion type BLD motor 130 may be disposed between the main frame 116 and the subframe 118.

The permanent magnet insertion type BCD motor 130 may include a shaft 165 having a long length vertically. An upper end of the shaft 165 may be connected to the pivoting scroll 125 and a lower end of the shaft 165 may be rotatably supported by the subframe 118. An eccentric part may be provided at an upper end of the shaft 165. As a result, the turning scroll 125 may compress the refrigerant while pivoting with respect to the fixed scroll 122.

The permanent magnet insertion type BCD motor 130 may include a stator 140 and a rotor 160 including a shaft 165 and rotatably disposed with respect to the stator 140.

The stator 140 may include a stator core 141 having a plurality of slots 145 and teeth 146 and a stator coil 147 wound around the teeth 146.

The stator core 141 may have a rotor accommodation hole 144 in which the rotor 160 is accommodated.

A plurality of slots 145 and teeth 146 may be formed around the rotor accommodation hole 144. The slot 145 and the tooth 146 may be formed to be alternately arranged with each other along the circumferential direction of the rotor receiving hole 144. Here, the slot 145 may be composed of nine.

The stator core 141 may be configured by insulatingly stacking a plurality of electrical steel plates 142 on which the rotor accommodation holes 144, the slots 145, and the teeth 146 are formed.

The stator coil 147 may be composed of a concentrated winding wound around the teeth 146 intensively.

The rotor 160 includes a shaft 165, a rotor core 171 coupled to the shaft 165, and a rotor having a plurality of permanent magnets 190 axially inserted into the rotor core 171 ( 160); may be configured to include.

The rotor core 171 may be configured to have a predetermined outer diameter D so that the rotor core 171 may be disposed with a predetermined air gap inside the rotor accommodation hole 144.

2 and 3, the rotor core 171 may be provided with a shaft hole 175 through which the shaft 165 may be coupled at the center thereof.

Peripheral magnet insertion unit 191 may be formed around the shaft hole 175 so that the permanent magnet 190 can be inserted in the axial direction.

A fastening member insertion hole 177 may be formed through the outer side of the shaft hole 175 so that a fastening member (not shown) can be inserted therein.

A through hole 178 may be formed at an outer side of the shaft hole 175 to allow fluid to pass therethrough.

The rotor core 171 may be formed by insulating stacking a plurality of electrical steel plates 172 on which the shaft hole 175 and the permanent magnet inserting portion 191 are formed.

The rotor 160 may be composed of six poles. Since the rotor 160 takes two permanent magnets per pole, a total of 12 permanent magnets 190 may be included.

3 and 4, the rotor core 171 has the same radius D / 2 at the center of the shaft 165 and is formed symmetrically with respect to the d axis. ); And a non-garden part 185 which is symmetric about the q axis and is cut along the circumferential direction gradually from one end of the garden portion 181 and has a maximum cutting depth A at the q axis. In addition, the garden portion 181 and the non-garden portion 185 may be configured to be alternately arranged.

Here, the cutting depth means a distance in the radial direction from the virtual circumference having the same radius as the garden portion 181 to the outer surface of the cut non-garden portion 185.

When the number of poles of the rotor 160 is P, the garden portion 181 may be configured such that the d-axis and the inner angle θ1 of one end thereof have a range of (30 ° to 90 °) / P. By this, the torque ripple can be significantly reduced.

In the present embodiment, since the rotor 160 is composed of six poles, the garden portion 181 has the d-axis and the inner angle θ1 of one end thereof is (30 ° to 90 °) / 6, that is, 5 ° to 15 °. It may be formed within a range. Accordingly, the garden portion 181 may be formed symmetrically in a range of 10 ° to 30 ° toward both sides of the d axis about the d axis.

As shown in FIG. 5, when the inner portion θ1 of the d-axis and one end is formed at 5 ° to 15 °, the torque ripple is significantly reduced to 5% or less due to the torque ripple. The generation of vibration and noise can be significantly reduced.

On the other hand, the non-garden portion 185 may be formed by cutting the radius gradually smaller along the circumferential direction at the end of the garden portion 181.

The non-garden part 185 may be formed symmetrically about the q-axis.

The non-garden part 185 may have a maximum cutting depth A in the q-axis.

The non-garden part 185 may be configured to have a value of the ratio A: D to the outer diameter D of the rotor 160 at the maximum cutting depth A. As a result, torque ripple of the motor 130 may be significantly reduced.

As shown in FIG. 6, the non-garden part 185 has a value (A / D) of a ratio (A: D) to the outer diameter D of the rotor 160 at a maximum cutting depth A of 0.01. At ~ 0.04, the torque ripple can be significantly reduced below 5%. In particular, when the ratio A / D is 0.03, the torque ripple has a minimum value approaching almost 4%, so the ratio may be most preferably 0.03.

The non-garden part 185 may be configured to include a straight section 186a whose cutting depth varies linearly.

The straight sections 186a may be formed symmetrically with each other with the q-axis therebetween.

A round portion 186c may be formed in the boundary region between the two straight sections 186a. According to this, stress concentration at the time of manufacture by a metal mold | die can be prevented and mold damage can be suppressed. The round part 186c may be formed of an arc contacting the two straight line sections 186a at the same time.

The linear section 186a may be configured such that the q-axis and the inner angle θ2 form 60 ° to 80 °. The inner angles of the two straight sections 186a may be formed within a range of 120 ° to 160 ° on both sides of the q axis. As a result, the torque ripple of the motor 130 may be significantly reduced.

As illustrated in FIG. 7, the non-garden part 185 has a torque ripple of 5% or less when the linear section 186a and the inner angle θ2 of the q-axis are configured within a range of 60 ° to 80 °. Can be significantly reduced. In particular, the cabinet θ2 has a minimum value of approximately 4% at 70 °, and the cabinet θ2 may be more preferably configured at 70 degrees.

The non-garden part 185 may be configured to include a curved section portion 186b connected to the straight section portion 186a such that a radius thereof gradually decreases along the circumferential direction at one end of the garden portion 181. .

4, the boundary between the curved section 186b and the straight section 186a, the straight section 186a and the round section 186c is slightly exaggerated for the convenience of description. Each boundary region may be configured to be connected smoothly. For example, the curved section 186b may be in contact with the straight section 186a. In addition, both ends of the round portion 186c may be configured to contact the two straight sections 186a, respectively.

On the other hand, two permanent magnets 190 may be arranged per pole. That is, the pair of permanent magnets 190 may be formed to have the same magnetic pole.

The permanent magnet 190 may be configured in a rectangular cross-sectional shape.

The pair of permanent magnets 190 may be disposed symmetrically with respect to the d-axis with the same magnetic pole.

The pair of permanent magnets 190 may have an end portion close to the d-axis close to the shaft 165 and the other end portion close to a circumference, and may be disposed in a substantially “V” shape.

The rotor core 171 may be formed with a permanent magnet inserting portion 191 so that the permanent magnet 190 can be inserted.

The permanent magnet inserting portion 191 may be formed in a "V" shape symmetrically with respect to the d-axis.

In addition, the permanent magnet insertion unit 191 may be configured in an inverted "V" shape so that the two permanent magnets 190 having different magnetic poles are disposed symmetrically about the q-axis.

On the other hand, the permanent magnet inserting portion 191 may be configured such that the two permanent magnets 190 having different magnetic poles have a suitable shortest distance (B).

In addition, a flux barrier 195 may be provided at an end portion of the permanent magnet insertion unit 191.

The flux barrier 195 may be formed by extending an end portion of the permanent magnet inserting portion 191 to form an empty space in an end region of the permanent magnet 190.

An end portion of the permanent magnet inserting portion 191 may include a parallel portion 194a disposed to be parallel to the straight section 186a and spaced apart from each other by a predetermined distance. Here, the parallel portion 194a may be configured to have an appropriate separation distance C with the straight section 186a.

The permanent magnet inserting portion 191 is the shortest distance (B) of the two permanent magnets 190 having different magnetic poles and the distance (C) of the straight section 186a and the parallel portion 194a is the rotor It may be configured to have an appropriate size according to the outer diameter (D) of (160).

In the conventional permanent magnet insertion type BCD motor, since the shortest distance (B) and the separation distance (C) are configured without consideration, the shortest distance (B) and the separation distance (C) are relatively too small. Is formed, the rigidity (strength) of the rotor 160 is vulnerable, so that deformation occurs during high-speed rotation can shorten the life. In addition, in the conventional permanent magnet insertion type BMD motor, the shortest distance (B) and the separation distance (C) are formed too large so that the size of the permanent magnet inserting portion 191 becomes small and eventually the size of the permanent magnet. Can be made small, so that the output of the motor can be made small. In addition, the leakage magnetic flux may be increased to reduce the motor efficiency.

On the contrary, the permanent magnet insertion type BCD motor 130 of the present invention has a ratio of the shortest distance B of the two permanent magnets 190 having different magnetic poles to the outer diameter D of the rotor 160. The value of B: D) may be configured to have a value of 0.02 to 0.035. As a result, the rotational rigidity of the rotor 160 may be increased to suppress deformation and damage of the rotor 160, and the torque may be increased to improve the performance of the motor 130.

As shown in FIG. 8, the permanent magnet inserting portion 191 has a ratio B with respect to the outer diameter D of the rotor 160 of the shortest distance B of the two permanent magnets 190 having different magnetic poles. Since the value of D is 0.02 to 0.035, when the rotor 160 rotates at 9000 rpm (revolutions per minute), it can be seen that the rotational rigidity of the rotor 160 is greatly improved to a safety factor of 1.5 or more. . Herein, the safety factor may be yield stress / max stress when the rotor 160 rotates at 9000 rpm.

In addition, it can be seen that the torque is significantly increased to Torque / mmf of 1.8 or more. Here, mmf may be a magnetomotive force, which may be a product N * I of the number of turns N of the coil and the current I. That is, it can be seen that the torque is remarkably increased at the same number of turns and the amount of current.

In addition, the permanent magnet insertion type BCD motor 130 of the present invention, the ratio of the distance (C) between the linear section (186a) and the parallel portion (194a) to the outer diameter (D) of the rotor (160). The value of (C: D) may be configured to be 0.006 to 0.010. As a result, the rotational rigidity of the rotor 160 may be increased, and deformation and damage of the rotor 160 may be suppressed, and torque of the rotor 160 may be increased to improve performance of the motor 130. .

The parallel portion 194a may be configured to extend from one long side portion of the permanent magnet inserting portion 191.

The end portion 193 of the permanent magnet inserting portion 191 may be configured to include a connection portion 194b connecting the end portion of the parallel portion 194a and the other long side portion of the permanent magnet inserting portion 191.

The end portion 193 of the permanent magnet inserting portion 191 may further include an arc portion 194c formed at a boundary between the parallel portion 194a and the connection portion 194b. As a result, stress is concentrated on the edge portion 193 of the permanent magnet inserting portion 191, more specifically, at the boundary between the parallel portion 194a and the connecting portion 194b, thereby reducing the rotational rigidity.

As shown in FIG. 9, the end portion 193 of the permanent magnet inserting portion 191 has an outer diameter of the rotor 160 at a distance C between the linear section 186a and the parallel portion 194a. Since the value of the ratio (C: D) with respect to (D) is formed to be 0.006 to 0.010, it can be seen that the rotational rigidity is greatly increased to a safety factor of 1.5 or more at 9000 rpm rotation of the rotor 160. As a result, the permanent magnet insertable BLD motor of the present invention is rotated at 7200 rpm, whereas the rotor 160 of the present invention is not deformed or damaged at 9000 rpm. High speed rotation is possible.

In addition, the value of the ratio (C: D) to the outer diameter (D) of the rotor 160 of the distance (C) between the straight section (186a) and the parallel portion (194a) is formed by 0.006 ~ 0.010, Torque / mmf of 1.8 or more can significantly increase the torque.

Meanwhile, the non-garden part 185 may further include a curved section 186b extending from one end of the garden section 181 to the straight section 186a.

The curved section 186b may be configured as an arc having a predetermined radius of curvature in which a center is disposed inside a virtual circumference having the same radius (D / 2) as that of the garden section 181.

Hereinafter, another embodiment of the present invention will be described with reference to FIG. 10.

The same reference numerals and the same components as the above-described and illustrated configurations are denoted by the same reference numerals for convenience of description, and some overlapping descriptions will be omitted.

[2]

As shown in FIGS. 10 and 11, the permanent magnet insertable BLD motor 130 includes a stator 140 and a shaft 165 to be rotatably disposed with respect to the stator 140. It may be configured to have (160).

The rotor 160 includes a shaft 165, a rotor core 171 coupled to the shaft 165, and a plurality of permanent magnets 190 axially inserted into the rotor core 171. Can be configured.

The rotor core 171, the garden portion 181 having the same radius in the center of the shaft 165 and formed symmetrically about the d-axis; And a non-garden part 195 which is symmetric about the q-axis and is cut along the circumferential direction gradually from one end of the garden portion 181 and has a maximum cutting depth A in the q-axis. The garden portion 181 and the non-garden portion 195 may be configured to be alternately arranged.

On the other hand, the non-garden portion 195, the two curved intervals 196a which are formed as an arc that intersects each other in the q-axis and is symmetrical to the q-axis so that the cutting depth gradually increases at one end of the garden portion 181. ) And a round part 196b formed by an arc contacting the two curved sections 196a.

Here, an end portion (q-axis side end) and the q-axis of the one-sided curve section 196a may have an inner angle θ2 within a range of 60 ° to 80 °. As a result, torque ripple of the motor 130 may be significantly reduced, and vibration and noise generation due to torque ripple may be significantly reduced.

The arcs of the two curved sections 196a are centered on the inner side of the circumference of the garden section 181 so as to be convex to the outside, and the arc of the round section 196b has the center of the two curved sections. It may be disposed outside the 196a to be convex inward.

By such a configuration, the permanent magnet insertion type BCD motor 130 of the present invention, the above-described garden portion 181 and the non-garden portion 185, 195 are formed alternately with each other effectively to the magnetic flux of the permanent magnet 190 It may be delivered to the stator 140. As a result, the efficiency of the motor 130 can be improved, and torque ripple can be reduced to suppress vibration and noise caused by torque ripple.

In addition, the permanent magnet insertion type BCD motor 130 of the present invention, by eliminating the formation of the edge or attachment of the rotor core 171, can be mass-produced and at the same time improve the efficiency of the motor 130 In addition, torque ripple can be reduced. Furthermore, it is possible to secure the rotational rigidity of the rotor 160 to prevent deformation and damage of the rotor 160 even at a high speed rotation of 9000 r.p.m.

In the above, specific embodiments of the present invention have been shown and described. However, the present invention can be embodied in various forms without departing from the spirit or essential features thereof, so the embodiments described above 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 120 compression unit
122: fixed scroll 125: turning scroll
130: Permanent magnet insert Bieldi motor
140: stator 141: stator core
160: rotor 165: shaft
171: rotor core 181: garden
185: non-garden part 186a: straight section
186b: curved section 186c: round section
190: permanent magnet 191: permanent magnet insert
193: end portion 194a: parallel portion
194b: connection portion 194c: arc portion

Claims (16)

A stator having a stator core having a plurality of slots and teeth, and a stator coil wound around the teeth; And
And a rotor having a shaft, a rotor core coupled to the shaft, and a plurality of permanent magnets axially inserted into the rotor core.
The rotor core is:
A garden portion having the same radius at the center of the shaft and formed symmetrically with respect to the d axis; And
and a non-garden part which is symmetric about the q axis and is cut along the circumferential direction gradually from one end of the garden portion and has a maximum cutting depth on the q axis.
The garden portion and the non-garden portion of the permanent magnet insert type Bildish motor, characterized in that arranged alternately. The method of claim 1,
When the number of poles of the rotor is P, the inner magnet θ of the d-axis and one end is (30 ° ~ 90 °) / P, characterized in that the permanent magnet insertion type Bildish motor. The method of claim 1,
The rotor is a permanent magnet insertion type Bieldish motor, characterized in that the value of the ratio (A: D) to the outer diameter (D) of the rotor of the maximum cutting depth (A) of the non-garden part is 0.01 ~ 0.04 . 4. The method according to any one of claims 1 to 3,
The non-garden part has a straight section extending in a straight line at the point of maximum cutting depth, the straight section is symmetrical with respect to the q-axis, the one-sided straight section and the q-axis has an internal angle of 60 to 80 degrees Permanent magnet insert Bieldi motor. The method of claim 4, wherein
The rotor core has a permanent magnet inserting portion is formed so that the permanent magnet can be inserted, the permanent magnet inserting portion is formed so that two permanent magnets having different magnetic poles can be disposed symmetrically with respect to the q axis Permanent magnet insert Bieldi motor. The method of claim 5,
The permanent magnet insertion unit is a permanent magnet insertion type Bildish motor, characterized in that the two permanent magnets having the same magnetic pole is formed symmetrically with respect to the d-axis. The method of claim 6,
The rotor has a permanent magnet insertion, characterized in that the value of the ratio (B: D) to the rotor outer diameter (D) of the shortest distance (B) of the two permanent magnets having different magnetic poles is 0.02 ~ 0.035 Expression Bieldish Motor. The method of claim 6,
The permanent magnet has a rectangular cross section, the end of the permanent magnet insert portion of the permanent magnet insertion type Bildish motor, characterized in that it has a parallel portion disposed in parallel with the straight section. The method of claim 8,
The rotor is a permanent magnet insertion type, characterized in that the value of the ratio (C: D) to the rotor outer diameter (D) of the distance (C) between the straight section and the parallel portion is 0.006 ~ 0.010 Bieldi Motors. The method of claim 8,
The parallel portion extends from one long side portion of the permanent magnetic insert portion,
The end portion of the permanent magnet insertion portion, the permanent magnet insertion type characterized in that it further comprises a connecting portion for connecting the end of the parallel portion and the other long side of the permanent magnet insertion portion, and an arc portion formed at the boundary between the parallel portion and the connecting portion Bieldi Motors. The method of claim 4, wherein
The stator core has nine slots, and the rotor is a six-pole permanent magnet motor, characterized in that the six-pole. The method of claim 11,
The stator coil is a permanent magnet insertion type Bildish motor, characterized in that consisting of a concentrated winding. The method of claim 4, wherein
The non-garden part, the permanent magnet insertion type Bildish motor further comprises a curved section extending from the one end of the garden portion to the straight section. 4. The method according to any one of claims 1 to 3,
The non-garden part may include two curved sections intersecting each other on the q-axis and symmetrical to the q-axis, and a round part formed by an arc contacting the two curved sections, so that the cutting depth is gradually increased at one end of the garden portion. Permanent magnet insert type BLD motor. The method of claim 14,
Peripheral magnet insert-type Bildish motor, characterized in that the inner angle of the end of the one side curved section and the q-axis is 60 ° to 80 °. Compressor comprising a permanent magnet insertion type BMD motor of claim 1.

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