An asymmetric magnetic pole permanent magnet driving motor

Abstract

The utility model provides a kind of asymmetric magnetic pole permanent magnet drive motor, belong to automobile motor electrical technology field.Drive motor permanent magnet rotor core is equipped with multiple magnetic gap, effectively reduce leakage magnetic area, improve magnetic steel utilization, permanent magnet rotor adopts combined pole, the magnetic field of each magnetic pole is commonly provided by multiple permanent magnet steel, magnetic effect is obvious, magnetic field intensity is big, power density is high, the permanent magnet rotor N magnetic pole and S magnetic pole all adopt asymmetric structure, effectively reduce tooth slot torque, reduce torque ripple, drive motor runs smoothly.

Description

Technical Field

[0001] This utility model provides an asymmetric permanent magnet drive motor, belonging to the field of automotive motor and electrical technology. Background Technology

[0002] Currently, most drive motors used in new energy vehicles are DC motors with carbon brushes and mechanical commutators. Although DC motors have a simple structure, high controllability, wide speed range, relatively simple control circuits, and low cost, the magnetic field of a DC drive motor is generated by an electrically excited winding, resulting in high energy consumption and low output power. In addition, the presence of carbon brushes and mechanical commutators not only limits the overload capacity and speed of the drive motor, but also necessitates frequent maintenance and replacement of carbon brushes and commutators if the motor operates for a long time. DC motors have high energy consumption and a high failure rate, and their performance needs further improvement. Summary of the Invention

[0003] The purpose of this utility model is to provide an asymmetric permanent magnet drive motor that overcomes the above-mentioned defects. This motor features an asymmetric magnetic pole structure for the permanent magnet rotor, low cogging torque, small torque pulsation, and a magnetic field for each pole provided by multiple permanent magnet steel plates. It also boasts high magnetic field strength, high power density, good sinusoidal air gap magnetic flux density with low distortion, and a compact structure. The technical content of this invention is as follows:

[0004] The asymmetric permanent magnet drive motor consists of a rotor, stator, fan cover, fan, housing, front cover, and rear cover. Its characteristic is that the permanent magnet rotor has an asymmetric magnetic pole structure.

[0005] The asymmetric magnetic pole permanent magnet rotor consists of a shaft, a rotor core, a first rectangular permanent magnet, a second rectangular permanent magnet, a third rectangular permanent magnet, a fourth rectangular permanent magnet, a fifth rectangular permanent magnet, a "human" - shaped magnetic isolation air gap, a second magnetic isolation air gap, a third magnetic isolation air gap, a fourth magnetic isolation air gap, and a fifth magnetic isolation air gap. An even number of radially - structured first rectangular slots penetrating the thickness of the rotor punching sheet are evenly arranged near the outer circle of the rotor punching sheet. An arc - shaped magnetic isolation air gap penetrating the thickness of the rotor punching sheet is provided at the outer end of the first rectangular slot. The outer end of the arc - shaped magnetic isolation air gap is not connected to the outer circle of the rotor punching sheet, and the inner end of the arc - shaped magnetic isolation air gap is connected to the outer end of the first rectangular slot, and the diameter of the circle formed by the arc - shaped magnetic isolation air gap is greater than the width of the first rectangular slot. A "human" - shaped magnetic isolation air gap penetrating the thickness of the rotor punching sheet is provided at the inner end of the first rectangular slot. The upper end of the "human" - shaped magnetic isolation air gap is connected to the inner end of the first rectangular slot, and the width of the upper end of the "human" - shaped magnetic isolation air gap is less than the width of the inner end of the first rectangular slot. Two adjacent first rectangular slots are in an inverted "V" shape. There is a second rectangular slot in an inverted "V" shape penetrating the thickness of the rotor punching sheet between the lower right end of the "human" - shaped magnetic isolation air gap at the inner end of the first rectangular slot on the left of the two first rectangular slots in an inverted "V" shape and the lower left end of the "human" - shaped magnetic isolation air gap at the inner end of the first rectangular slot on the right of the two first rectangular slots in an inverted "V" shape. The inner ends of the two second rectangular slots in an inverted "V" shape are not connected and are not connected to the inner circle of the rotor punching sheet. The outer end of the second rectangular slot on the left of the two second rectangular slots in an inverted "V" shape is connected to the lower right end of the "human" - shaped magnetic isolation air gap at the inner end of the first rectangular slot on the left of the two first rectangular slots in an inverted "V" shape, and the width of the second rectangular slot on the left of the two second rectangular slots in an inverted "V" shape is greater than the width of the lower right end of the "human" - shaped magnetic isolation air gap at the inner end of the first rectangular slot on the left of the two first rectangular slots in an inverted "V" shape. The outer end of the second rectangular slot on the right of the two second rectangular slots in an inverted "V" shape is connected to the lower left end of the "human" - shaped magnetic isolation air gap at the inner end of the first rectangular slot on the right of the two first rectangular slots in an inverted "V" shape, and the width of the second rectangular slot on the right of the two second rectangular slots in an inverted "V" shape is greater than the width of the lower left end of the "human" - shaped magnetic isolation air gap at the inner end of the first rectangular slot on the right of the two first rectangular slots in an inverted "V" shape. A third rectangular slot penetrating the thickness of the rotor punching sheet is provided on the left side of the center line of the two first rectangular slots in an inverted "V" shape. The outer end of the third rectangular slot is not connected to the outer circle of the rotor punching sheet and is not connected to the outer end of the first rectangular slot on the left of the two first rectangular slots in an inverted "V" shape. A second magnetic isolation air gap penetrating the thickness of the rotor punching sheet is provided at the inner end of the third rectangular slot. The outer end of the second magnetic isolation air gap is connected to the inner end of the third rectangular slot, and the width of the outer end of the second magnetic isolation air gap is less than the width of the inner end of the third rectangular slot. The inner end of the second magnetic isolation air gap extends along the center line of the two first rectangular slots in an inverted "V" shape to the inner ends of the two second rectangular slots in an inverted "V" shape, and the inner end of the second magnetic isolation air gap is not connected to the inner ends of the two second rectangular slots in an inverted "V" shape;

[0006] To the right of the center line of the two adjacent inverted "V"-shaped first rectangular slots, a fourth rectangular slot with a tangential structure penetrating the thickness of the rotor lamination is provided. The lower end of the fourth rectangular slot is above the line connecting the inner ends of the two inverted "V"-shaped first rectangular slots. At the left end of the fourth rectangular slot, a rectangular third magnetic isolation gap penetrating the thickness of the rotor lamination is provided. The outer end of the third magnetic isolation gap is connected to the left end of the fourth rectangular slot, and the width of the outer end of the third magnetic isolation gap is less than the width of the left end of the fourth rectangular slot. The inner end of the third magnetic isolation gap extends along the center line of the two inverted "V"-shaped first rectangular slots to the inner end of the two adjacent inverted "V"-shaped second rectangular slots, but the inner end of the third magnetic isolation gap is not connected to the inner end of the two inverted "V"-shaped second rectangular slots. At the right end of the fourth rectangular slot, a rectangular fourth magnetic isolation gap with a tangential structure penetrating the thickness of the rotor lamination is provided. The left end of the fourth magnetic isolation gap is connected to the right end of the fourth rectangular slot, and the fourth... The width of the left end of the magnetic isolation air gap is less than the width of the right end of the fourth rectangular slot. Between the fourth rectangular slot and the first rectangular slot to the right of the two first rectangular slots in an inverted "V" shape, there is a fifth rectangular slot that penetrates the thickness of the rotor lamination and is parallel to the center line of the two first rectangular slots in an inverted "V" shape. The outer end of the fifth rectangular slot is not connected to the outer circle of the rotor lamination. The inner end of the fifth rectangular slot is located above the fourth rectangular slot. The inner end of the fifth rectangular slot is not connected to the inner end of the first rectangular slot to the right of the two first rectangular slots in an inverted "V" shape, nor to the right end of the fourth rectangular slot. At the inner end of the fifth rectangular slot, there is a rectangular fifth magnetic isolation air gap that penetrates the thickness of the rotor lamination. The outer end of the fifth magnetic isolation air gap is connected to the inner end of the fifth rectangular slot, and the width of the outer end of the fifth magnetic isolation air gap is less than the width of the inner end of the fifth rectangular slot. The right end of the fourth magnetic isolation air gap is connected to the inner end of the fifth magnetic isolation air gap, and the lower edge of the right end of the fourth magnetic isolation air gap intersects the left side of the inner end of the fifth magnetic isolation air gap at a point.

[0007] The rotor laminations are stacked and welded with the burrs facing one direction to form the rotor core. Two identical first rectangular permanent magnets are installed in two inverted "V"-shaped first rectangular slots, with both sides having N poles. A second rectangular permanent magnet is installed in the second rectangular slot to the right of the two inverted "V"-shaped second rectangular slots, with its outer side having N poles. The third rectangular permanent magnet is installed in the third rectangular slot with its outer side having N poles, forming the rotor core. The magnetic rotor has an N pole. Another second rectangular permanent magnet is installed in the second rectangular slot to the left of the two inverted "V" shaped slots directly below the inner ends of the first rectangular permanent magnets, with the outer side as the S pole. The fourth rectangular permanent magnet is installed in the fourth rectangular slot with the upper end as the S pole, and the fifth rectangular permanent magnet is installed in the fifth rectangular slot with the left end as the S pole, forming the permanent magnet rotor's S pole. This process is repeated to form an asymmetrical permanent magnet rotor with N and S poles arranged alternately.

[0008] Compared with the prior art, this utility model has multiple magnetic isolation air gaps on the permanent magnet rotor core, which effectively reduces the leakage magnetic area and improves the utilization rate of the magnet. The permanent magnet rotor adopts a combined magnetic pole, and the magnetic field of each magnetic pole is provided by multiple permanent magnets, which has a significant magnetic concentration effect, high magnetic field strength and high power density. The N and S magnetic poles of this permanent magnet rotor adopt an asymmetrical structure, which effectively reduces cogging torque, reduces torque pulsation, and drives the motor to run smoothly. Attached Figure Description

[0009] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0010] Figure 2 yes Figure 1 A cross-sectional view of the permanent magnet rotor in the embodiment shown.

[0011] In the diagram: 1. Fan cover; 2. Fan; 3. Shaft; 4. Rear end cover; 5. First rectangular permanent magnet; 6. Third rectangular permanent magnet; 7. Stator core; 8. Second rectangular permanent magnet; 9. Rotor core; 10. Housing; 11. Front end cover; 12. Fourth rectangular permanent magnet; 13. Fifth rectangular permanent magnet; 14. "V"-shaped magnetic isolation air gap; 15. Second magnetic isolation air gap; 16. Third magnetic isolation air gap; 17. Fourth magnetic isolation air gap; 18. Fifth magnetic isolation air gap. Detailed Implementation

[0012] The present invention will be further described below with reference to the accompanying drawings:

[0013] The asymmetric permanent magnet drive motor consists of a rotor, a stator, a fan cover 1, a fan 2, a housing 10, a front cover 11, and a rear cover 4. Its characteristic is that the permanent magnet rotor has an asymmetric magnetic pole structure.

[0014] The asymmetric permanent magnet rotor consists of a shaft 3, a rotor core 9, a first rectangular permanent magnet 5, a second rectangular permanent magnet 8, a third rectangular permanent magnet 6, a fourth rectangular permanent magnet 12, a fifth rectangular permanent magnet 13, a herringbone-shaped magnetic isolation air gap 14, a second magnetic isolation air gap 15, a third magnetic isolation air gap 16, a fourth magnetic isolation air gap 17, and a fifth magnetic isolation air gap 18. Near the outer circumference of the rotor lamination, an even number of radially arranged first rectangular slots penetrating the thickness of the rotor lamination are evenly distributed. At the outer end of each first rectangular slot, an arc-shaped magnetic isolation air gap penetrating the thickness of the rotor lamination is formed. The outer end of the arc-shaped magnetic isolation air gap is not connected to the outer circumference of the rotor lamination, while the inner end of the arc-shaped magnetic isolation air gap is connected to the outer end of the first rectangular slot. The diameter of the arc-shaped magnetic isolation air gap is larger than the width of the first rectangular slot. A V-shaped magnetic air gap 14, penetrating the thickness of the rotor lamination, is provided at the inner end of the first rectangular slot. The upper end of the V-shaped magnetic air gap 14 is connected to the inner end of the first rectangular slot, and the width of the upper end of the V-shaped magnetic air gap 14 is smaller than the width of the inner end of the first rectangular slot. Two adjacent first rectangular slots form an inverted V-shape. Between the lower right end of the V-shaped magnetic air gap 14 at the inner end of the left side of the two inverted V-shaped first rectangular slots and the lower left end of the V-shaped magnetic air gap 14 at the inner end of the right side of the two inverted V-shaped first rectangular slots, a second rectangular slot, penetrating the thickness of the rotor lamination, is provided. The inner ends of the two inverted V-shaped second rectangular slots are not connected and are not connected to the inner circle of the rotor lamination. The outer end of the left second rectangular groove in the two inverted "V"-shaped second rectangular grooves is connected to the lower right end of the "V"-shaped magnetic air gap 14 forming the inner end of the left first rectangular groove in the two inverted "V"-shaped second rectangular grooves. The width of the left second rectangular groove in the two inverted "V"-shaped second rectangular grooves is greater than the width of the lower right end of the "V"-shaped magnetic air gap 14 forming the inner end of the left first rectangular groove in the two inverted "V"-shaped second rectangular grooves. The outer end of the right second rectangular groove in the two inverted "V"-shaped second rectangular grooves is connected to the lower left end of the "V"-shaped magnetic air gap 14 forming the inner end of the right first rectangular groove in the two inverted "V"-shaped second rectangular grooves. The width of the right second rectangular groove in the two inverted "V"-shaped second rectangular grooves is greater than the width of the right first rectangular groove forming the inner end of the left first rectangular groove in the two inverted "V"-shaped second rectangular grooves. The width of the lower left end of the "V"-shaped magnetic air gap 14 at the inner end of the first rectangular slot on the right side of the first rectangular slot is such that a third rectangular slot penetrating the thickness of the rotor lamination is provided to the left of the center line of the two inverted "V"-shaped first rectangular slots. The outer end of the third rectangular slot is not connected to the outer circle of the rotor lamination or to the outer end of the first rectangular slot on the left side of the two inverted "V"-shaped first rectangular slots. The inner end of the third rectangular slot is provided with a second magnetic air gap 15 penetrating the thickness of the rotor lamination. The outer end of the second magnetic air gap 15 is connected to the inner end of the third rectangular slot, and the width of the outer end of the second magnetic air gap 15 is smaller than the width of the inner end of the third rectangular slot. The inner end of the second magnetic air gap 15 extends along the center line of the two inverted "V"-shaped first rectangular slots to the inner end of the two inverted "V"-shaped second rectangular slots.Furthermore, the inner end of the second magnetically insulating air gap 15 is not connected to the inner ends of the two second rectangular slots that form an inverted "V" shape;

[0015] To the right of the center line of the two adjacent inverted "V"-shaped first rectangular slots, a fourth rectangular slot with a tangential structure penetrating the thickness of the rotor lamination is provided. The lower end of the fourth rectangular slot is above the line connecting the inner ends of the two inverted "V"-shaped first rectangular slots. At the left end of the fourth rectangular slot, a rectangular third magnetic isolation gap 16 penetrating the thickness of the rotor lamination is provided. The outer end of the third magnetic isolation gap 16 is connected to the left end of the fourth rectangular slot, and the width of the outer end of the third magnetic isolation gap 16 is smaller than the width of the left end of the fourth rectangular slot. The inner end of the third magnetic isolation gap 16 extends along the center line of the two inverted "V"-shaped first rectangular slots to the inner end of the two adjacent inverted "V"-shaped second rectangular slots, and the inner end of the third magnetic isolation gap 16 is not connected to the inner end of the two inverted "V"-shaped second rectangular slots. At the right end of the fourth rectangular slot, a rectangular fourth magnetic isolation gap 17 with a tangential structure penetrating the thickness of the rotor lamination is provided. The left end of the fourth magnetic isolation gap 17 is connected to the right end of the fourth rectangular slot, and the fourth magnetic isolation gap 17... The width of the left end of the magnetic gap 17 is smaller than the width of the right end of the fourth rectangular slot. Between the fourth rectangular slot and the rightmost first rectangular slot of the two inverted "V"-shaped first rectangular slots, a fifth rectangular slot is provided, penetrating the thickness of the rotor lamination and parallel to the centerline of the two inverted "V"-shaped first rectangular slots. The outer end of the fifth rectangular slot is not connected to the outer circle of the rotor lamination, and the inner end of the fifth rectangular slot is located above the fourth rectangular slot. The inner end of the fifth rectangular slot is parallel to the centerline of the rightmost first rectangular slot of the two inverted "V"-shaped first rectangular slots. The inner end of the rectangular slot is not connected to the right end of the fourth rectangular slot. A rectangular fifth magnetic isolation air gap 18 is provided at the inner end of the fifth rectangular slot, which penetrates the thickness of the rotor lamination. The outer end of the fifth magnetic isolation air gap 18 is connected to the inner end of the fifth rectangular slot, and the width of the outer end of the fifth magnetic isolation air gap 18 is smaller than the width of the inner end of the fifth rectangular slot. The right end of the fourth magnetic isolation air gap 17 is connected to the inner end of the fifth magnetic isolation air gap 18, and the lower edge of the right end of the fourth magnetic isolation air gap 17 intersects the left side of the inner end of the fifth magnetic isolation air gap 18 at a point.

[0016] The rotor laminations are stacked and welded with the burrs facing one direction to form the rotor core 9. Two identical first rectangular permanent magnet steels 5 are installed in two inverted "V"-shaped first rectangular slots with opposite sides having N poles. A second rectangular permanent magnet steel 8 is installed in the second rectangular slot to the right of the two inverted "V"-shaped second rectangular slots directly below the inner ends of the two first rectangular permanent magnet steels 5, which also have opposite sides having N poles, with its outer side having N poles. A third rectangular permanent magnet steel 6 is installed in the third rectangular slot with its outer side having N poles, forming a permanent magnet core 9. The magnetic rotor has an N pole. Another second rectangular permanent magnet 8 is installed in the second rectangular slot to the left of the two inverted "V" shaped second rectangular slots directly below the inner end of the two first rectangular permanent magnets 5, with the outer side as the S pole. The fourth rectangular permanent magnet 12 is installed in the fourth rectangular slot with the upper end face as the S pole, and the fifth rectangular permanent magnet 13 is installed in the fifth rectangular slot with the left end face as the S pole, forming the permanent magnet rotor's S pole. This process is repeated to form an asymmetrical permanent magnet rotor with N and S poles arranged alternately.

Claims

1. An asymmetric permanent magnet drive motor, comprising a rotor, a stator, a fan cover (1), a fan (2), a housing (10), a front cover (11), and a rear cover (4), characterized in that: The permanent magnet rotor has an asymmetric magnetic pole structure; The asymmetric magnetic pole permanent magnet rotor consists of a shaft (3), a rotor core (9), a first rectangular permanent magnet (5), a second rectangular permanent magnet (8), a third rectangular permanent magnet (6), a fourth rectangular permanent magnet (12), a fifth rectangular permanent magnet (13), a "human"-shaped magnetic isolation air gap (14), a second magnetic isolation air gap (15), a third magnetic isolation air gap (16), a fourth magnetic isolation air gap (17), and a fifth magnetic isolation air gap (18). An even number of first rectangular slots with a radial structure penetrating the thickness of the rotor punching are evenly arranged near the outer circle of the rotor punching. An arc-shaped magnetic isolation air gap penetrating the thickness of the rotor punching is provided at the outer end of the first rectangular slot. The outer end of the arc-shaped magnetic isolation air gap is not connected to the outer circle of the rotor punching, and the inner end of the arc-shaped magnetic isolation air gap is connected to the outer end of the first rectangular slot. Moreover, the diameter of the circle formed by the arc-shaped magnetic isolation air gap is greater than the width of the first rectangular slot. A "human"-shaped magnetic isolation air gap (14) penetrating the thickness of the rotor punching is provided at the inner end of the first rectangular slot. The upper end of the "human"-shaped magnetic isolation air gap (14) is connected to the inner end of the first rectangular slot, and the width of the upper end of the "human"-shaped magnetic isolation air gap (14) is less than the width of the inner end of the first rectangular slot. Two adjacent first rectangular slots are in an inverted "V" shape. A second rectangular slot in an inverted "V" shape penetrating the thickness of the rotor punching is provided between the lower right end of the "human"-shaped magnetic isolation air gap (14) at the inner end of the first rectangular slot on the left of the two first rectangular slots in an inverted "V" shape and the lower left end of the "human"-shaped magnetic isolation air gap (14) at the inner end of the first rectangular slot on the right of the two first rectangular slots in an inverted "V" shape. The inner ends of the two second rectangular slots in an inverted "V" shape are not connected and are not connected to the inner circle of the rotor punching. The outer end of the second rectangular slot on the left of the two second rectangular slots in an inverted "V" shape is connected to the lower right end of the "human"-shaped magnetic isolation air gap (14) at the inner end of the first rectangular slot on the left of the two first rectangular slots in an inverted "V" shape, and the width of the second rectangular slot on the left of the two second rectangular slots in an inverted "V" shape is greater than the width of the lower right end of the "human"-shaped magnetic isolation air gap (14) at the inner end of the first rectangular slot on the left of the two first rectangular slots in an inverted "V" shape. The outer end of the second rectangular slot on the right of the two second rectangular slots in an inverted "V" shape is connected to the lower left end of the "human"-shaped magnetic isolation air gap (14) at the inner end of the first rectangular slot on the right of the two first rectangular slots in an inverted "V" shape, and the width of the second rectangular slot on the right of the two second rectangular slots in an inverted "V" shape is greater than the width of the lower left end of the "human"-shaped magnetic isolation air gap (14) at the inner end of the first rectangular slot on the right of the two first rectangular slots in an inverted "V" shape. A third rectangular slot penetrating the thickness of the rotor punching is provided on the left side of the center line of the two first rectangular slots in an inverted "V" shape. The outer end of the third rectangular slot is not connected to the outer circle of the rotor punching and is not connected to the outer end of the first rectangular slot on the left of the two first rectangular slots in an inverted "V" shape. A second magnetic isolation air gap (15) penetrating the thickness of the rotor punching is provided at the inner end of the third rectangular slot. The outer end of the second magnetic isolation air gap (15) is connected to the inner end of the third rectangular slot, and the width of the outer end of the second magnetic isolation air gap (15) is less than the width of the inner end of the third rectangular slot.The inner end of the second magnetic isolation air gap (15) extends along the center line of the two first rectangular grooves in the shape of an inverted "8" to the inner end of the two second rectangular grooves in the shape of an inverted "8", and the inner end of the second magnetic isolation air gap (15) is not connected to the inner end of the two second rectangular grooves in the shape of an inverted "8". To the right of the center line of the two adjacent inverted "V" shaped first rectangular slots, a fourth rectangular slot with a tangential structure penetrating the thickness of the rotor lamination is provided. The lower end of the fourth rectangular slot is above the line connecting the inner ends of the two inverted "V" shaped first rectangular slots. At the left end of the fourth rectangular slot, a rectangular third magnetic isolation air gap (16) penetrating the thickness of the rotor lamination is provided. The outer end of the third magnetic isolation air gap (16) is connected to the left end of the fourth rectangular slot, and the width of the outer end of the third magnetic isolation air gap (16) is smaller than the width of the left end of the fourth rectangular slot. The inner end of the third magnetic isolation air gap (16) extends along the center line of the two first rectangular slots in the shape of an inverted "V" to the inner end of the two adjacent second rectangular slots in the shape of an inverted "V". The inner end of the third magnetic isolation air gap (16) is not connected to the inner end of the two second rectangular slots in the shape of an inverted "V". The right end of the fourth rectangular slot is provided with a rectangular fourth magnetic isolation air gap (17) with a tangential structure that penetrates the thickness of the rotor lamination. The left end of the fourth magnetic isolation air gap (17) is connected to the right end of the fourth rectangular slot and the fourth magnetic isolation air gap (17) is connected to the right end of the fourth rectangular slot. The width of the left end of the air gap (17) is less than the width of the right end of the fourth rectangular slot. Between the fourth rectangular slot and the first rectangular slot to the right of the two first rectangular slots in an inverted "V" shape, there is a fifth rectangular slot that penetrates the thickness of the rotor lamination and is parallel to the center line of the two first rectangular slots in an inverted "V" shape. The outer end of the fifth rectangular slot is not connected to the outer circle of the rotor lamination. The inner end of the fifth rectangular slot is located above the fourth rectangular slot. The inner end of the fifth rectangular slot is connected to the inner end of the first rectangular slot to the right of the two first rectangular slots in an inverted "V" shape. The fifth rectangular slot is not connected to the right end of the fourth rectangular slot. A rectangular fifth magnetic air gap (18) that penetrates the thickness of the rotor lamination is provided at the inner end of the fifth rectangular slot. The outer end of the fifth magnetic air gap (18) is connected to the inner end of the fifth rectangular slot. The width of the outer end of the fifth magnetic air gap (18) is smaller than the width of the inner end of the fifth rectangular slot. The right end of the fourth magnetic air gap (17) is connected to the inner end of the fifth magnetic air gap (18). The lower edge of the right end of the fourth magnetic air gap (17) intersects the left side of the inner end of the fifth magnetic air gap (18) at a point. The rotor laminations are stacked and welded with the burrs facing one direction to form the rotor core (9). Two identical first rectangular permanent magnets (5) are installed in two inverted "V" shaped first rectangular slots with their opposite sides both having N poles. A second rectangular permanent magnet (8) is installed in the second rectangular slot to the right of the two inverted "V" shaped second rectangular slots, with its outer side having N poles. The third rectangular permanent magnet (6) is installed in the third rectangular slot with its outer side having N poles, forming... The permanent magnet rotor has an N pole. Another second rectangular permanent magnet (8) is installed in the second rectangular slot to the left of the two inverted "eight" shaped second rectangular slots directly below the inner end of the two opposite first rectangular permanent magnets (5), with the outer side as the S pole. The fourth rectangular permanent magnet (12) is installed in the fourth rectangular slot with the upper end as the S pole. The fifth rectangular permanent magnet (13) is installed in the fifth rectangular slot with the left end as the S pole, forming the permanent magnet rotor S pole. This process is repeated to form an asymmetrical permanent magnet rotor with N and S poles arranged alternately.

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