Ferrite and neodymium iron boron permanent magnet compound excitation magnetic field type motor

Abstract

The application provides a ferrite and neodymium-iron-boron permanent magnet composite excitation magnetic gathering type motor, and belongs to the technical field of automobile motor electric appliances. The ferrite permanent magnet steel and the neodymium-iron-boron permanent magnet steel are used to provide magnetic potential sources for rotor magnetic poles, the number of rare earth permanent magnet steels used is saved, the cost is reduced, each magnetic pole on the rotor is composed of multiple permanent magnet steels and magnetic gap, the magnetic gathering effect is obvious, the magnetic field strength is large, the power density is high, the N magnetic pole and the S magnetic pole are not symmetrical to each other, the magnetic field of each magnetic pole is composed of multiple sub magnetic fields, the tooth slot torque and torque ripple are reduced, the magnetic gap on the rotor magnetic pole restricts the magnetic path, the air gap magnetic density distribution tends to be sinusoidal, the air gap harmonic magnetic density content is reduced, the stator core eddy current loss is reduced, and the generator output efficiency is improved.

Description

Technical Field

[0001] This invention provides a ferrite and neodymium iron boron permanent magnet composite excitation and focusing magnet motor, belonging to the field of automotive motor and electrical technology. Background Technology

[0002] Currently, most permanent magnet generators used in automobiles are combinations of symmetrical magnetic poles. For example, the existing technology, patent name: Rotor structure of an embedded permanent magnet synchronous motor, patent number: ZL202310837784.2, discloses the following technical solution: It adopts an inverted U-shaped magnetic pole composed of arc-shaped permanent magnet steel and rectangular permanent magnet steel, which reduces the no-load back electromotive force and air gap magnetic flux density distortion rate. However, due to the lack of an effective heat dissipation channel, the permanent magnet is prone to demagnetization. The rotor of this motor has a symmetrical magnetic pole structure, the cogging torque is large, the motor running stability is reduced, and its performance needs to be further improved. Summary of the Invention

[0003] The purpose of this invention is to provide a ferrite and NdFeB permanent magnet composite excitation motor that overcomes the above-mentioned defects. It uses both ferrite permanent magnets and NdFeB permanent magnets to provide the magnetomotive force source for the rotor poles, saving on the amount of rare earth permanent magnets used and reducing costs. Furthermore, the magnetic field of each pole is provided by multiple permanent magnets, resulting in high magnetic field strength and high power density. The rotor adopts an asymmetric pole structure, resulting in low cogging torque and small torque pulsation. The technical content is as follows: A ferrite and neodymium iron boron permanent magnet composite excitation and focusing magnetic motor is composed of a front end cover, a rear end cover, a rotor, and a stator. Its characteristic is that the permanent magnet rotor is a composite excitation and focusing magnetic pole structure of ferrite permanent magnet steel and neodymium iron boron permanent magnet steel. The composite excitation and focusing magnetic permanent magnet rotor of ferrite permanent magnet steel and neodymium iron boron permanent magnet steel includes a shaft, a rotor core, and first rectangular ferrite permanent magnet steel, second rectangular ferrite permanent magnet steel, third rectangular ferrite permanent magnet steel, fourth rectangular ferrite permanent magnet steel, fifth rectangular ferrite permanent magnet steel, sixth rectangular ferrite permanent magnet steel, first rectangular neodymium iron boron permanent magnet steel, second rectangular neodymium iron boron permanent magnet steel, third rectangular neodymium iron boron permanent magnet steel, fourth rectangular neodymium iron boron permanent magnet steel, fifth rectangular neodymium iron boron permanent magnet steel, sixth rectangular neodymium iron boron permanent magnet steel, seventh rectangular neodymium iron boron permanent magnet steel, eighth rectangular neodymium iron boron permanent magnet steel, ninth rectangular neodymium iron boron permanent magnet steel, tenth rectangular neodymium iron boron permanent magnet steel, eleventh rectangular neodymium iron boron permanent magnet steel, twelfth rectangular neodymium iron boron permanent magnet steel, and thirteenth rectangular neodymium iron boron permanent magnet steel. The fourteenth rectangular NdFeB permanent magnet steel, the fifteenth rectangular NdFeB permanent magnet steel, the first semi-circular NdFeB permanent magnet steel, the second semi-circular NdFeB permanent magnet steel, the first magnetic isolation air gap, the second magnetic isolation air gap, the third magnetic isolation air gap, the fourth magnetic isolation air gap, the fifth magnetic isolation air gap, the sixth magnetic isolation air gap, the seventh magnetic isolation air gap, the eighth magnetic isolation air gap, the ninth magnetic isolation air gap, the tenth magnetic isolation air gap, the eleventh magnetic isolation air gap, the twelfth magnetic isolation air gap, the thirteenth magnetic isolation air gap, the fourteenth magnetic isolation air gap, the fifteenth magnetic isolation air gap, the sixteenth magnetic isolation air gap, the seventeenth magnetic isolation air gap, the eighteenth magnetic isolation air gap, the nineteenth magnetic isolation air gap, the twentieth magnetic isolation air gap, and the "human" shaped magnetic isolation air gap, located near the outer circle of the rotor lamination and to the left of the center line of the first N magnetic pole, and at the same location as the first N magnetic pole. A first rectangular slot penetrating the thickness of the rotor lamination is provided to the right of the centerline with an included angle of 22.5°. The centerline of the first rectangular slot along its length is parallel to the centerline of the first N magnetic pole. A first arc-shaped magnetic air gap penetrating the thickness of the rotor lamination is provided at the outer end of the first rectangular slot. The outer end of the first arc-shaped magnetic air gap is not connected to the outer circle of the rotor lamination. The inner end of the first arc-shaped magnetic air gap is connected to the outer end of the first rectangular slot, and the diameter of the arc-shaped magnetic air gap circle is larger than the width of the first rectangular slot. A sixteenth rectangular slot penetrating the thickness of the rotor lamination is provided at the inner end of the first rectangular slot. The upper end of the sixteenth rectangular slot is connected to the inner end of the first rectangular slot, and the length of the sixteenth rectangular slot is smaller than the width of the first rectangular slot. A penetrating rotor lamination is provided at the lower end of the sixteenth rectangular slot. A first magnetic isolation air gap with a thickness along the tangential direction is formed. The upper end of the first magnetic isolation air gap is connected to the lower end of the sixteenth rectangular slot. The left end of the first magnetic isolation air gap is on the same straight line as the left end of the sixteenth rectangular slot. The right end of the first magnetic isolation air gap is to the left of the center line of the first N magnetic pole. The lower end of the first magnetic isolation air gap is not connected to the inner circle of the rotor lamination. Near the outer circle of the rotor lamination, to the right of the center line of the first N magnetic pole and to the left of the center line with an angle of 22.5° with the center line of the first N magnetic pole, a second rectangular slot penetrating the thickness of the rotor lamination is provided. The center line of the length direction of the second rectangular slot is parallel to the center line of the first N magnetic pole. The second rectangular slot and the first rectangular slot are symmetrical about the center line of the first N magnetic pole. A second arc-shaped magnetic isolation air gap penetrating the thickness of the rotor lamination is provided at the outer end of the second rectangular slot.The outer end of the second arc-shaped magnetic air gap is not connected to the outer circle of the rotor lamination. The inner end of the second arc-shaped magnetic air gap is connected to the outer end of the second rectangular slot, and the diameter of the circle forming the second arc-shaped magnetic air gap is larger than the width of the second rectangular slot. A seventeenth rectangular slot penetrating the thickness of the rotor lamination is provided at the inner end of the second rectangular slot. The upper end of the seventeenth rectangular slot is connected to the inner end of the second rectangular slot, and the length of the seventeenth rectangular slot is smaller than the width of the second rectangular slot. A second magnetic air gap penetrating the thickness of the rotor lamination along the tangential direction is provided at the lower end of the seventeenth rectangular slot. The upper end of the second magnetic air gap is connected to the lower end of the seventeenth rectangular slot. The right end of the second magnetic air gap is on the same straight line as the right end of the seventeenth rectangular slot. The left end of the second magnetic air gap is to the right of the center line of the first N magnetic pole. The left end of the magnetic isolation air gap is not connected to the right end of the first magnetic isolation air gap. The lower end of the second magnetic isolation air gap is not connected to the inner circle of the rotor lamination. The lower end of the second magnetic isolation air gap and the lower end of the first magnetic isolation air gap are on the same straight line. Near the outer circle of the rotor lamination and on the center line of the first N magnetic pole, there is a first semi-circular groove that penetrates the thickness of the rotor lamination. The inner arc surface of the first semi-circular groove faces the outer circle of the rotor lamination. The outer end of the first semi-circular groove is not connected to the outer circle of the rotor lamination. Between the lower end of the first semi-circular groove and the upper ends of the first and second magnetic isolation air gaps, and on the center line of the first N magnetic pole, there are two first rectangular grooves with a figure-eight structure that penetrate the thickness of the rotor lamination. The upper ends of the two first rectangular grooves with a figure-eight structure are not connected to each other. The upper ends of the two first rectangular slots are not connected to the lower end of the outer arc surface of the first semicircular slot. The lower end of the left first rectangular slot in the two first rectangular slots with a figure-eight structure is not connected to the upper end of the first magnetic isolation air gap. The lower end of the right first rectangular slot in the two first rectangular slots with a figure-eight structure is not connected to the upper end of the second magnetic isolation air gap. A third magnetic isolation air gap penetrating the thickness of the rotor lamination is provided between the lower end of the left first rectangular slot in the two first rectangular slots with a figure-eight structure and the first rectangular slot. The inner end of the third magnetic isolation air gap is connected to the lower end of the left first rectangular slot in the two first rectangular slots with a figure-eight structure, and the width of the third magnetic isolation air gap is smaller than that of the left first rectangular slot in the two first rectangular slots with a figure-eight structure. The width of the slot is such that the outer end of the third magnetic isolation air gap extends outward to the outer circle of the rotor lamination and is not connected to the outer circle of the rotor lamination, the outer end of the first rectangular slot, or the left end of the first semicircular slot. A fourth magnetic isolation air gap, penetrating the thickness of the rotor lamination, is provided between the lower end of the first rectangular slot on the right side of the two first rectangular slots forming a figure-eight structure and the second rectangular slot. The inner end of the fourth magnetic isolation air gap is connected to the lower end of the first rectangular slot on the right side of the two first rectangular slots forming a figure-eight structure, and the width of the fourth magnetic isolation air gap is less than the width of the first rectangular slot on the right side of the two first rectangular slots forming a figure-eight structure. The outer end of the fourth magnetic isolation air gap extends outward to the outer circle of the rotor lamination and is not connected to the outer circle of the rotor lamination, the outer end of the second rectangular slot, or the right end of the first semicircular slot. Along a clockwise direction, near the outer circumference of the rotor lamination, to the left of the center line of the second N magnetic pole and to the right of the center line at an angle of 22.5° to the center line of the second N magnetic pole, a third rectangular slot penetrating the thickness of the rotor lamination is provided. The center line of the length direction of the third rectangular slot is parallel to the center line of the second N magnetic pole. A third arc-shaped magnetic isolation gap penetrating the thickness of the rotor lamination is provided at the outer end of the third rectangular slot. The outer end of the third arc-shaped magnetic isolation gap is not connected to the outer circumference of the rotor lamination. The inner end of the third arc-shaped magnetic isolation gap is connected to the outer end of the third rectangular slot, and the diameter of the circle forming the third arc-shaped magnetic isolation gap is larger than the width of the third rectangular slot. A through-hole is provided at the inner end of the third rectangular slot. The rotor lamination has an eighteenth rectangular slot, the upper end of which is connected to the inner end of the third rectangular slot and the length of the eighteenth rectangular slot is less than the width of the third rectangular slot. At the lower end of the eighteenth rectangular slot, there is a fifth magnetic isolation gap that penetrates the thickness of the rotor lamination along the tangential direction. The upper end of the fifth magnetic isolation gap is connected to the lower end of the eighteenth rectangular slot. The left end of the fifth magnetic isolation gap is on the same straight line as the left end of the eighteenth rectangular slot. The right end of the fifth magnetic isolation gap is to the left of the center line of the second N magnetic pole. The lower end of the fifth magnetic isolation gap is not connected to the inner circle of the rotor lamination. It is located near the outer circle of the rotor lamination and to the right of the center line of the second N magnetic pole, with an angle of 22° with the center line of the second N magnetic pole.A fourth rectangular slot, penetrating the thickness of the rotor lamination, is provided to the left of the 5° centerline. The centerline of the fourth rectangular slot along its length is parallel to the centerline of the second N magnetic pole. The fourth rectangular slot and the third rectangular slot are symmetrical about the centerline of the second N magnetic pole. A fourth arc-shaped magnetic air gap, penetrating the thickness of the rotor lamination, is provided at the outer end of the fourth rectangular slot. The outer end of the fourth arc-shaped magnetic air gap is not connected to the outer circle of the rotor lamination. The inner end of the fourth arc-shaped magnetic air gap is connected to the outer end of the fourth rectangular slot, and the diameter of the circle forming the fourth arc-shaped magnetic air gap is larger than the width of the fourth rectangular slot. A nineteenth rectangular slot, penetrating the thickness of the rotor lamination, is provided at the inner end of the fourth rectangular slot. The upper end of the nineteenth rectangular slot is connected to the inner end of the fourth rectangular slot. The length of the first rectangular slot is less than the width of the fourth rectangular slot. At the lower end of the nineteenth rectangular slot, a sixth magnetic air gap, penetrating the thickness of the rotor lamination and extending tangentially, is provided. The upper end of the sixth magnetic air gap is connected to the lower end of the nineteenth rectangular slot. The right end of the sixth magnetic air gap is on the same straight line as the right end of the nineteenth rectangular slot. The left end of the sixth magnetic air gap is to the right of the center line of the second N magnetic pole. The left end of the sixth magnetic air gap is not connected to the right end of the fifth magnetic air gap. The lower end of the sixth magnetic air gap is not connected to the inner circle of the rotor lamination. The lower end of the sixth magnetic air gap is on the same straight line as the lower end of the fifth magnetic air gap. Near the outer circle of the rotor lamination and on the center line of the second N magnetic pole, two fifth rectangular slots, penetrating the thickness of the rotor lamination and forming an inverted "V" shape, are provided. The outer ends of the two fifth rectangular slots in the "8" shape are not connected to the outer circle of the rotor lamination. The inner ends of the two fifth rectangular slots in the inverted "8" shape are not connected. Below the inner ends of the two fifth rectangular slots in the inverted "8" shape, above the fifth and sixth magnetic isolation gaps, to the right of the third rectangular slot, and to the left of the fourth rectangular slot, there is a sixth rectangular slot that penetrates the thickness of the rotor lamination along the tangential direction. The upper end of the sixth rectangular slot is not connected to the inner ends of the two fifth rectangular slots in the inverted "8" shape. The lower end of the sixth rectangular slot is not connected to the upper ends of the fifth and sixth magnetic isolation gaps. At the left end of the sixth rectangular slot, there is a seventh magnetic isolation gap that penetrates the thickness of the rotor lamination. The inner end of the seventh magnetic isolation gap is connected to the sixth rectangular slot. The left end of the rectangular slot is connected, and the width of the seventh magnetic isolation air gap is smaller than the width of the sixth rectangular slot. The outer end of the seventh magnetic isolation air gap extends outward to the outer circle of the rotor lamination and is not connected to the outer circle of the rotor lamination, the outer end of the third rectangular slot, or the outer ends of the fifth rectangular slots on the left side of the two fifth rectangular slots with an inverted "8" shape. An eighth magnetic isolation air gap penetrating the thickness of the rotor lamination is provided at the right end of the sixth rectangular slot. The inner end of the eighth magnetic isolation air gap is connected to the right end of the sixth rectangular slot, and the width of the eighth magnetic isolation air gap is smaller than the width of the sixth rectangular slot. The outer end of the eighth magnetic isolation air gap extends outward to the outer circle of the rotor lamination and is not connected to the outer circle of the rotor lamination, the outer end of the fourth rectangular slot, or the outer ends of the fifth rectangular slots on the right side of the two fifth rectangular slots with an inverted "8" shape. Along a clockwise direction, near the outer circle of the rotor lamination, to the left of the center line of the third N magnetic pole and to the right of the center line at an angle of 22.5° to the center line of the third N magnetic pole, a fifth rectangular slot penetrating the thickness of the rotor lamination is provided. The center line of the length direction of the fifth rectangular slot is parallel to the center line of the third N magnetic pole. At the outer end of the fifth rectangular slot, a fifth arc-shaped magnetic isolation gap penetrating the thickness of the rotor lamination is provided. The outer end of the fifth arc-shaped magnetic isolation gap is not connected to the outer circle of the rotor lamination. The inner end of the fifth arc-shaped magnetic isolation gap is connected to the outer end of the fifth rectangular slot, and the diameter of the circle forming the fifth arc-shaped magnetic isolation gap is larger than the width of the fifth rectangular slot. At the inner end of the fifth rectangular slot, a twentieth rectangular slot penetrating the thickness of the rotor lamination is provided. The upper end of the twentieth rectangular slot is connected to the inner end of the fifth rectangular slot, and the twentieth rectangular slot is... The length of the slot is less than the width of the fifth rectangular slot. A ninth magnetic isolation air gap, penetrating the thickness of the rotor lamination and running tangentially, is provided at the lower end of the twentieth rectangular slot. The upper end of the ninth magnetic isolation air gap is connected to the lower end of the twentieth rectangular slot. The left end of the ninth magnetic isolation air gap is on the same straight line as the left end of the twentieth rectangular slot. The right end of the ninth magnetic isolation air gap is to the left of the center line of the third N magnetic pole. The lower end of the ninth magnetic isolation air gap is not connected to the inner circle of the rotor lamination. Near the outer circle of the rotor lamination, to the right of the center line of the third N magnetic pole and to the left of the center line at an angle of 22.5° to the center line of the third N magnetic pole, a sixth rectangular slot, penetrating the thickness of the rotor lamination, is provided. The center line of the sixth rectangular slot is parallel to the center line of the third N magnetic pole. The sixth rectangular slot and the fifth rectangular slot are symmetrical about the center line of the third N magnetic pole. A sixth arc-shaped magnetic air gap, penetrating the thickness of the rotor lamination, is provided at the outer end of the rectangular slot. The outer end of the sixth arc-shaped magnetic air gap is not connected to the outer circle of the rotor lamination. The inner end of the sixth arc-shaped magnetic air gap is connected to the outer end of the sixth rectangular slot, and the diameter of the circle forming the sixth arc-shaped magnetic air gap is larger than the width of the sixth rectangular slot. A twenty-first rectangular slot, penetrating the thickness of the rotor lamination, is provided at the inner end of the sixth rectangular slot. The upper end of the twenty-first rectangular slot is connected to the inner end of the sixth rectangular slot, and the length of the twenty-first rectangular slot is smaller than the width of the sixth rectangular slot. A tenth magnetic air gap, penetrating the thickness of the rotor lamination along the tangential direction, is provided at the lower end of the twenty-first rectangular slot. The upper end of the tenth magnetic air gap is connected to the lower end of the twenty-first rectangular slot, and the right end of the tenth magnetic air gap and the right end of the twenty-first rectangular slot are on the same straight line. Above, the left end of the tenth magnetic isolation air gap is located to the right of the center line of the third N magnetic pole. The left end of the tenth magnetic isolation air gap is not connected to the right end of the ninth magnetic isolation air gap. The lower end of the tenth magnetic isolation air gap is not connected to the inner circle of the rotor lamination. The lower ends of the tenth magnetic isolation air gap and the lower ends of the ninth magnetic isolation air gap are on the same straight line. Near the outer circle of the rotor lamination and between the center line of the third N magnetic pole and the fifth rectangular slot, there is an eleventh rectangular slot that penetrates the thickness of the rotor lamination. The center line of the eleventh rectangular slot in the length direction is parallel to the center line of the third N magnetic pole. The outer end of the eleventh rectangular slot is not connected to the outer circle of the rotor lamination. At the inner end of the eleventh rectangular slot, there is a twenty-second rectangular slot that penetrates the thickness of the rotor lamination. The upper end of the twenty-second rectangular slot is connected to the inner end of the eleventh rectangular slot, and the length of the twenty-second rectangular slot is less than the width of the eleventh rectangular slot.A thirteenth magnetic air gap, penetrating the thickness of the rotor lamination and extending tangentially, is provided at the lower end of the twenty-second rectangular slot. The upper left end of the thirteenth magnetic air gap is connected to the lower end of the twenty-second rectangular slot, and the left end of the thirteenth magnetic air gap is on the same straight line as the left end of the twenty-second rectangular slot. A twelfth rectangular slot, penetrating the thickness of the rotor lamination, is provided near the outer circumference of the rotor lamination and between the center line of the third N magnetic pole and the sixth rectangular slot. The center line of the twelfth rectangular slot along its length is parallel to the center line of the third N magnetic pole. The twelfth rectangular slot and the eleventh rectangular slot are symmetrical about the center line of the third N magnetic pole. The outer end of the twelfth rectangular slot is not connected to the outer circumference of the rotor lamination. A twenty-third rectangular slot, penetrating the thickness of the rotor lamination, is provided at the inner end of the twelfth rectangular slot. The upper end of the twenty-third rectangular slot is connected to the inner end of the twelfth rectangular slot, and the length of the twenty-third rectangular slot is less than the width of the twelfth rectangular slot. The lower end of the twenty-third rectangular slot is connected to the upper right end of the thirteenth magnetic gap. The right end of the twenty-third rectangular slot and the right end of the thirteenth magnetic gap are on the same straight line. Near the outer circle of the rotor lamination and between the eleventh rectangular slot and the fifth rectangular slot, a ninth rectangular slot, penetrating the thickness of the rotor lamination, is provided. The outer end of the ninth rectangular slot is not connected to the outer circle of the rotor lamination, the outer end of the eleventh rectangular slot, or the outer end of the fifth rectangular slot. An eleventh magnetic air gap, penetrating the thickness of the rotor lamination, is provided at the inner end of the ninth rectangular slot. The left end of the eleventh magnetic air gap is connected to the inner end of the ninth rectangular slot, and the width of the eleventh magnetic air gap is smaller than the width of the ninth rectangular slot. The right end of the eleventh magnetic air gap is to the left of the center line of the third N magnetic pole. The upper end of the eleventh magnetic air gap is not connected to the lower end of the thirteenth magnetic air gap, and the lower end of the eleventh magnetic air gap is not connected to the upper end of the ninth magnetic air gap. A tenth rectangular slot, penetrating the thickness of the rotor lamination, is provided near the outer circle of the rotor lamination and between the twelfth rectangular slot and the sixth rectangular slot. The outer end of the tenth rectangular slot is connected to the outer circle of the rotor lamination and the twelfth rectangular slot. The outer ends of the first and sixth rectangular slots are not connected. A twelfth magnetic air gap, penetrating the thickness of the rotor lamination, is located inside the tenth rectangular slot. The right end of the twelfth magnetic air gap is connected to the inner end of the tenth rectangular slot, and the width of the twelfth magnetic air gap is less than the width of the tenth rectangular slot. The left end of the twelfth magnetic air gap is to the right of the center line of the third N magnetic pole. The left end of the twelfth magnetic air gap is not connected to the right end of the eleventh magnetic air gap. The upper end of the twelfth magnetic air gap is not connected to the lower end of the thirteenth magnetic air gap. The lower end of the twelfth magnetic air gap is not connected to the upper end of the tenth magnetic air gap. The lower end of the twelfth magnetic air gap and the lower end of the eleventh magnetic air gap are on the same straight line. Between the second and third rectangular slots, and on the center line of the first S-pole near the outer circle of the rotor lamination, a fourteenth magnetic isolation gap is provided in the radial direction, penetrating the thickness of the rotor lamination. The outer end of the fourteenth magnetic isolation gap is not connected to the outer circle of the rotor lamination. Near the outer circle of the rotor lamination and between the fourteenth magnetic isolation gap and the second rectangular slot, a second rectangular slot is provided, penetrating the thickness of the rotor lamination. The outer end of the second rectangular slot is not connected to either the outer circle of the rotor lamination or the outer end of the second rectangular slot. Inside the second rectangular slot, a fifteenth magnetic isolation gap is provided, penetrating the thickness of the rotor lamination. The left end of the fifteenth magnetic isolation gap is connected to the inner end of the second rectangular slot, and the width of the fifteenth magnetic isolation gap is smaller than the width of the second rectangular slot. The right end of the fifteenth magnetic isolation gap is connected to the fourteenth magnetic isolation gap. Near the outer circle of the rotor lamination and between the fourteenth magnetic isolation gap and the second rectangular slot, a fourth rectangular slot is provided, penetrating the thickness of the rotor lamination. The outer end of the fourth rectangular slot is connected to both the outer circle of the rotor lamination and the outer circle of the second rectangular slot. The outer ends of the rectangular slot and the fourteenth magnetic air gap are not connected. The sixteenth magnetic air gap, which penetrates the thickness of the rotor lamination, is provided at the inner end of the fourth rectangular slot. The left end of the sixteenth magnetic air gap is connected to the inner end of the fourth rectangular slot, and the width of the sixteenth magnetic air gap is smaller than the width of the fourth rectangular slot. The right end of the sixteenth magnetic air gap is connected to the fourteenth magnetic air gap. The lower end of the sixteenth magnetic air gap is not connected to the upper end of the fifteenth magnetic air gap. Near the outer circle of the rotor lamination and between the fourteenth magnetic air gap and the third rectangular slot, a third rectangular slot, which penetrates the thickness of the rotor lamination, is provided. The outer end of the third rectangular slot is not connected to the outer circle of the rotor lamination, the outer end of the fourteenth magnetic air gap, or the outer end of the third rectangular slot. The twenty-fourth rectangular slot, which penetrates the thickness of the rotor lamination, is provided at the inner end of the third rectangular slot. The upper end of the twenty-fourth rectangular slot is connected to the inner end of the third rectangular slot, and the width of the twenty-fourth rectangular slot is smaller than the width of the third rectangular slot. The lower end of the twenty-fourth rectangular slot is connected to the inner end of the fourteenth magnetic air gap. Along a clockwise direction, between the fourth and fifth rectangular slots, and on the center line of the second S magnetic pole near the outer circle of the rotor lamination, a second semi-circular slot penetrating the thickness of the rotor lamination is provided. The inner arc surface of the second semi-circular slot faces the outer circle of the rotor lamination, and the outer end of the second semi-circular slot is not connected to the outer circle of the rotor lamination. On the center line of the second S magnetic pole and directly below the second semi-circular slot, a "V"-shaped magnetic isolation gap penetrating the thickness of the rotor lamination is provided. The upper end of the "V"-shaped magnetic isolation gap is not connected to the lower end of the second semi-circular slot. At the lower left end of the "V"-shaped magnetic isolation gap, an eighth rectangular slot penetrating the thickness of the rotor lamination is provided. The upper end of the eighth rectangular slot is connected to the lower left end of the "V"-shaped magnetic isolation gap, and the width of the eighth rectangular slot is greater than the width of the lower left end of the "V"-shaped magnetic isolation gap. Between the lower end of the eighth rectangular slot and the fourth rectangular slot, a seventeenth magnetic isolation gap penetrating the thickness of the rotor lamination is provided. The inner end of the seventeenth magnetic isolation gap... The lower end of the 17th magnetic air gap is connected to the lower end of the 8th rectangular slot and the width of the 17th magnetic air gap is less than the width of the 8th rectangular slot. The outer end of the 17th magnetic air gap extends outward to the outer circle of the rotor lamination and is not connected to the outer circle of the rotor lamination, the left end of the second semi-circular slot, or the outer end of the fourth rectangular slot. The lower right end of the "human" shaped magnetic air gap is provided with a 7th rectangular slot that penetrates the thickness of the rotor lamination. The upper end of the 7th rectangular slot is connected to the lower right end of the "human" shaped magnetic air gap and the width of the 7th rectangular slot is greater than the width of the lower right end of the "human" shaped magnetic air gap. The lower end of the 7th rectangular slot and the 5th rectangular slot are provided with an 18th magnetic air gap that penetrates the thickness of the rotor lamination. The inner end of the 18th magnetic air gap is connected to the lower end of the 7th rectangular slot and the width of the 18th magnetic air gap is less than the width of the 7th rectangular slot. The outer end of the 18th magnetic air gap extends outward to the outer circle of the rotor lamination and is not connected to the outer circle of the rotor lamination, the right end of the second semi-circular slot, or the outer end of the fifth rectangular slot. Along a clockwise direction, between the sixth rectangular slot and the first rectangular slot, on the center line of the third S magnetic pole and near the outer circle of the rotor lamination, a nineteenth magnetic air gap penetrating the thickness of the rotor lamination is provided in a radial direction. The outer end of the nineteenth magnetic air gap is not connected to the outer circle of the rotor lamination. Near the outer circle of the rotor lamination and between the nineteenth magnetic air gap and the sixth rectangular slot, a thirteenth rectangular slot penetrating the thickness of the rotor lamination is provided. The outer end of the thirteenth rectangular slot is not connected to the outer circle of the rotor lamination, the outer end of the sixth rectangular slot, or the outer end of the nineteenth magnetic air gap. A [missing information - likely a specific type of magnetic gap] penetrating the thickness of the rotor lamination is provided at the inner end of the thirteenth rectangular slot. The 25th rectangular slot has an upper end connected to the inner end of the 13th rectangular slot, and its width is smaller than that of the 13th rectangular slot. The lower end of the 25th rectangular slot is connected to the inner end of the 19th magnetic gap. Near the outer circumference of the rotor lamination, between the 19th magnetic gap and the first rectangular slot, a 14th rectangular slot penetrating the thickness of the rotor lamination is provided. The centerline of the 14th rectangular slot along its length is parallel to the centerline of the third S-pole. The outer end of the 14th rectangular slot is not connected to the outer circumference of the rotor lamination or the outer end of the first rectangular slot. A second rectangular slot penetrating the thickness of the rotor lamination is located at the inner end of the 14th rectangular slot. Sixteen rectangular slots are provided. The upper end of the twenty-sixth rectangular slot is connected to the inner end of the fourteenth rectangular slot, and the length of the twenty-sixth rectangular slot is less than the width of the fourteenth rectangular slot. A twentieth magnetic isolation air gap is provided at the lower end of the twenty-sixth rectangular slot, penetrating the thickness of the rotor lamination. The upper end of the twentieth magnetic isolation air gap is connected to the lower end of the twenty-sixth rectangular slot, and the length of the twentieth magnetic isolation air gap is greater than the length of the twenty-sixth rectangular slot. The right end of the twentieth magnetic isolation air gap is on the same straight line as the right end of the twenty-sixth rectangular slot. A twenty-seventh rectangular slot is provided at the left end of the twentieth magnetic isolation air gap, penetrating the thickness of the rotor lamination. The right end of the twenty-seventh rectangular slot is connected to the inner end of the fourteenth rectangular slot. The left end of the gap is connected. The lower end of the 27th rectangular slot is on the same straight line as the lower end of the 20th magnetic air gap. The 15th rectangular slot, which penetrates the thickness of the rotor lamination, is provided at the left end of the 27th rectangular slot. The right end of the 15th rectangular slot is connected to the left end of the 27th rectangular slot, and the length of the 27th rectangular slot is less than the width of the 15th rectangular slot. The 28th rectangular slot, which penetrates the thickness of the rotor lamination, is provided at the left end of the 15th rectangular slot. The right end of the 28th rectangular slot is connected to the left end of the 15th rectangular slot, and the length of the 28th rectangular slot is less than the width of the 15th rectangular slot. The left end of the 28th rectangular slot is connected to the 19th magnetic air gap. The rotor laminations are stacked and welded with the burrs facing the same direction to form the rotor core. A first rectangular ferrite permanent magnet is installed in a first rectangular slot with its right end face as the N pole. A second rectangular ferrite permanent magnet is installed in a second rectangular slot with its left end face as the N pole. A first semi-circular NdFeB permanent magnet is installed in a first semi-circular slot with its inner arc surface as the N pole. Two identical first rectangular NdFeB permanent magnets are installed in two first rectangular slots forming a V-shape, with their opposite sides having the back polarity as the N pole, forming the first N pole of the permanent magnet rotor. A second rectangular NdFeB permanent magnet is installed in a second rectangular slot with its right end face as the S pole. A third rectangular... Neodymium iron boron (NdFeB) permanent magnets are installed in the third rectangular slot with the left end face polarity as the S pole. A fourth rectangular NdFeB permanent magnet is installed in the fourth rectangular slot with the right end face polarity as the S pole, forming the first S pole of the permanent magnet rotor. A third rectangular ferrite permanent magnet is installed in the third rectangular slot with the right end face polarity as the N pole. A fourth rectangular ferrite permanent magnet is installed in the fourth rectangular slot with the left end face polarity as the N pole. Two identical fifth rectangular NdFeB permanent magnets are installed in two fifth rectangular slots arranged in an inverted "V" shape with opposite sides facing N poles. A sixth rectangular NdFeB permanent magnet is installed in the sixth rectangular slot with the top end face polarity as the N pole, forming the second N pole of the permanent magnet rotor. The second half... Circular NdFeB permanent magnets are installed in the second semi-circular slot with their inner arc surfaces having the S pole orientation. A seventh rectangular NdFeB permanent magnet is installed in the seventh rectangular slot with its upper end face having the S pole orientation. An eighth rectangular NdFeB permanent magnet is installed in the eighth rectangular slot with its upper end face having the S pole orientation, forming the second S pole of the permanent magnet rotor. A fifth rectangular ferrite permanent magnet is installed in the fifth rectangular slot with its right end face having the N pole orientation. A sixth rectangular ferrite permanent magnet is installed in the sixth rectangular slot with its left end face having the N pole orientation. A ninth rectangular NdFeB permanent magnet is installed in the ninth rectangular slot with its right end face having the N pole orientation. A tenth rectangular NdFeB permanent magnet is installed in the tenth rectangular slot with its left end face having the N pole orientation. The eleventh rectangular NdFeB permanent magnet is installed in the eleventh rectangular slot with the right end face polarity as N. The twelfth rectangular NdFeB permanent magnet is installed in the twelfth rectangular slot with the left end face polarity as N, forming the third N pole of the permanent magnet rotor. The thirteenth rectangular NdFeB permanent magnet is installed in the thirteenth rectangular slot with the right end face polarity as S. The fourteenth rectangular NdFeB permanent magnet is installed in the fourteenth rectangular slot with the left end face polarity as S. The fifteenth rectangular NdFeB permanent magnet is installed in the fifteenth rectangular slot with the top end face polarity as S, forming the third S pole of the permanent magnet rotor. This process is repeated to form a composite excitation and focusing permanent magnet rotor with N and S poles arranged alternately, consisting of ferrite permanent magnets and NdFeB permanent magnets.

[0004] Compared with existing technologies, this invention uses ferrite permanent magnet steel and neodymium iron boron permanent magnet steel to provide a magnetomotive force source for the rotor poles, saving the amount of rare earth permanent magnet steel used and reducing costs. Each pole on the rotor is composed of multiple permanent magnet steel sheets and a magnetically shielding air gap, resulting in a significant magnetization effect, high magnetic field strength, and high power density. Furthermore, the N pole and S pole are asymmetrical, and the magnetic field of each pole is composed of multiple sub-magnetic fields, reducing cogging torque and torque pulsation. The magnetically shielding air gap on the rotor poles constrains the magnetic circuit direction, making the air gap magnetic flux density distribution more sinusoidal, reducing the air gap harmonic magnetic flux density content, reducing stator core eddy current losses, and improving generator output efficiency. Attached Figure Description

[0005] Figure 1 This is a structural schematic diagram of an embodiment of the present invention; Figure 2 yes Figure 1 A cross-sectional view of the rotor in the embodiment shown.

[0006] In the diagram: 1. Shaft; 2. Rear end cover; 3. Rotor core; 4. First semi-circular NdFeB permanent magnet; 5. Second magnetic isolation air gap; 6. Thirteenth rectangular NdFeB permanent magnet; 7. Fifteenth rectangular NdFeB permanent magnet; 8. Fourteenth rectangular NdFeB permanent magnet; 9. Front end cover; 10. First magnetic isolation air gap; 11. First rectangular ferrite permanent magnet; 12. Third magnetic isolation air gap; 13. First rectangular NdFeB permanent magnet; 14. Fourth... 15. Magnetic gap 16. Second rectangular ferrite permanent magnet 17. Second rectangular NdFeB permanent magnet 18. Fourth rectangular NdFeB permanent magnet 19. Sixteenth magnetic gap 20. Fifteenth magnetic gap 21. Fourteenth magnetic gap 22. Third rectangular NdFeB permanent magnet 23. Seventh magnetic gap 24. Fifth rectangular NdFeB permanent magnet 25. Fifth magnetic gap 2 6. Sixth rectangular NdFeB permanent magnet steel; 27. Eighth magnetically insulating air gap; 28. Fourth rectangular ferrite permanent magnet steel; 29. ​​Sixth magnetically insulating air gap; 30. Fifth rectangular ferrite permanent magnet steel; 31. Ninth magnetically insulating air gap; 32. Eleventh magnetically insulating air gap; 33. Ninth rectangular NdFeB permanent magnet steel; 34. Eleventh rectangular NdFeB permanent magnet steel; 35. Thirteenth magnetically insulating air gap; 36. Twelfth rectangular NdFeB permanent magnet steel; 37. Tenth... 38. Two magnetic gaps; 39. Tenth rectangular NdFeB permanent magnet; 40. Tenth magnetic gap; 41. Sixth rectangular ferrite permanent magnet; 42. Nineteenth magnetic gap; 43. Twentieth magnetic gap; 44. Seventeenth magnetic gap; 45. Eighth rectangular NdFeB permanent magnet; 46. "A" shaped magnetic gap; 47. Second semi-circular NdFeB permanent magnet; 48. Seventh rectangular NdFeB permanent magnet; 49. Eighteenth magnetic gap. Detailed Implementation

[0007] The present invention will be further described below with reference to the accompanying drawings: A ferrite and neodymium iron boron permanent magnet composite excitation and focusing magnetic motor is composed of a front end cover 9, a rear end cover 2, a rotor, and a stator. Its characteristic is that the permanent magnet rotor is a composite excitation and focusing magnetic pole structure of ferrite permanent magnet steel and neodymium iron boron permanent magnet steel. The composite excitation and focusing magnetic pole permanent magnet rotor of ferrite permanent magnet steel and neodymium iron boron permanent magnet steel includes a shaft 1, a rotor core 3, a first rectangular ferrite permanent magnet steel 11, a second rectangular ferrite permanent magnet steel 15, a third rectangular ferrite permanent magnet steel 22, a fourth rectangular ferrite permanent magnet steel 28, a fifth rectangular ferrite permanent magnet steel 30, a sixth rectangular ferrite permanent magnet steel 40, a first rectangular neodymium iron boron permanent magnet steel 13, a second rectangular neodymium iron boron permanent magnet steel 16, a third rectangular neodymium iron boron permanent magnet steel 21, a fourth rectangular neodymium iron boron permanent magnet steel 17, a fifth rectangular neodymium iron boron permanent magnet steel 24, a sixth rectangular neodymium iron boron permanent magnet steel 26, a seventh rectangular neodymium iron boron permanent magnet steel 47, an eighth rectangular neodymium iron boron permanent magnet steel 44, a ninth rectangular neodymium iron boron permanent magnet steel 33, and a tenth rectangular neodymium iron boron permanent magnet steel 34. 8. Eleventh rectangular NdFeB permanent magnet steel 34, Twelfth rectangular NdFeB permanent magnet steel 36, Thirteenth rectangular NdFeB permanent magnet steel 6, Fourteenth rectangular NdFeB permanent magnet steel 8, Fifteenth rectangular NdFeB permanent magnet steel 7, First semi-circular NdFeB permanent magnet steel 4, Second semi-circular NdFeB permanent magnet steel 46, First magnetic isolation air gap 10, Second magnetic isolation air gap 5, Third magnetic isolation air gap 12, Fourth magnetic isolation air gap 14, Fifth magnetic isolation air gap 25, Sixth magnetic isolation air gap 29, Seventh magnetic isolation air gap 23, Eighth magnetic isolation air gap 27, Ninth magnetic isolation air gap 31, Tenth magnetic isolation air gap 39, Eleventh magnetic isolation air gap 32, Twelfth magnetic isolation air gap 37, Thirteenth magnetic isolation air gap 35, Fourteenth magnetic isolation air gap 20, Fifteenth magnetic isolation air gap 19, Sixteenth magnetic isolation air gap 18, Seventeenth magnetic isolation air gap Magnetic air gap 43, eighteenth magnetic air gap 48, nineteenth magnetic air gap 41, twentieth magnetic air gap 42, and "V"-shaped magnetic air gap 45 are provided near the outer circle of the rotor lamination, to the left of the center line of the first N magnetic pole and to the right of the center line at an angle of 22.5° to the center line of the first N magnetic pole. A first rectangular slot penetrating the thickness of the rotor lamination is provided at the outer end of the first rectangular slot. The center line of the length direction of the first rectangular slot is parallel to the center line of the first N magnetic pole. A first arc-shaped magnetic air gap penetrating the thickness of the rotor lamination is provided at the outer end of the first rectangular slot. The outer end of the first arc-shaped magnetic air gap is not connected to the outer circle of the rotor lamination. The inner end of the first arc-shaped magnetic air gap is connected to the outer end of the first rectangular slot, and the diameter of the circle forming the first arc-shaped magnetic air gap is larger than the width of the first rectangular slot. A... A sixteenth rectangular slot penetrates the thickness of the rotor lamination. The upper end of the sixteenth rectangular slot is connected to the inner end of the first rectangular slot, and the length of the sixteenth rectangular slot is less than the width of the first rectangular slot. A first magnetic isolation air gap 10 penetrating the thickness of the rotor lamination along the tangential direction is provided at the lower end of the sixteenth rectangular slot. The upper end of the first magnetic isolation air gap 10 is connected to the lower end of the sixteenth rectangular slot. The left end of the first magnetic isolation air gap 10 is on the same straight line as the left end of the sixteenth rectangular slot. The right end of the first magnetic isolation air gap 10 is to the left of the center line of the first N magnetic pole. The lower end of the first magnetic isolation air gap 10 is not connected to the inner circle of the rotor lamination. A second rectangular slot penetrating the thickness of the rotor lamination is provided near the outer circle of the rotor lamination, to the right of the center line of the first N magnetic pole, and to the left of the center line at an angle of 22.5° with the center line of the first N magnetic pole.The centerline of the second rectangular slot is parallel to the centerline of the first N magnetic pole. The second rectangular slot and the first rectangular slot are symmetrical about the centerline of the first N magnetic pole. A second arc-shaped magnetic air gap penetrating the thickness of the rotor lamination is provided at the outer end of the second rectangular slot. The outer end of the second arc-shaped magnetic air gap is not connected to the outer circle of the rotor lamination. The inner end of the second arc-shaped magnetic air gap is connected to the outer end of the second rectangular slot, and the diameter of the circle forming the second arc-shaped magnetic air gap is larger than the width of the second rectangular slot. A seventeenth rectangular slot penetrating the thickness of the rotor lamination is provided at the inner end of the second rectangular slot. The upper end of the seventeenth rectangular slot is connected to the inner end of the second rectangular slot, and the length of the seventeenth rectangular slot is smaller than the width of the second rectangular slot. A penetrating rotor lamination is provided at the lower end of the seventeenth rectangular slot. A second magnetic air gap 5, extending tangentially along the thickness of the rotor lamination, is formed. The upper end of the second magnetic air gap 5 is connected to the lower end of the seventeenth rectangular slot. The right end of the second magnetic air gap 5 is aligned with the right end of the seventeenth rectangular slot. The left end of the second magnetic air gap 5 is to the right of the center line of the first N magnetic pole and is not connected to the right end of the first magnetic air gap 10. The lower end of the second magnetic air gap 5 is not connected to the inner circle of the rotor lamination. The lower end of the second magnetic air gap 5 is aligned with the lower end of the first magnetic gap 10. A first semi-circular groove, penetrating the thickness of the rotor lamination, is provided near the outer circle of the rotor lamination and along the center line of the first N magnetic pole. The inner arc surface of the first semi-circular groove faces the outer circle of the rotor lamination, and the outer end of the first semi-circular groove is not connected to the outer circle of the rotor lamination. Two first rectangular slots in a figure-eight shape are provided between the lower end of the first semicircular slot and the upper end of the first magnetic isolation air gap 10 and the second magnetic isolation air gap 5, and on the center line of the first N magnetic pole, penetrating the thickness of the rotor lamination. The upper ends of the two first rectangular slots in a figure-eight shape are not connected. The upper ends of the two first rectangular slots in a figure-eight shape are not connected to the lowest end of the outer arc surface of the first semicircular slot. The lower end of the first rectangular slot on the left of the two first rectangular slots in a figure-eight shape is not connected to the upper end of the first magnetic isolation air gap 10. The lower end of the first rectangular slot on the right of the two first rectangular slots in a figure-eight shape is not connected to the upper end of the second magnetic isolation air gap 5. A third magnetic isolation air gap 12, penetrating the thickness of the rotor lamination, is provided between the lower end of the first rectangular slot on the left side of the first rectangular slot and the first rectangular slot on the right side of the two first rectangular slots that form a figure-eight structure. The inner end of the third magnetic isolation air gap 12 is connected to the lower end of the first rectangular slot on the left side of the two first rectangular slots that form a figure-eight structure, and the width of the third magnetic isolation air gap 12 is smaller than the width of the first rectangular slot on the left side of the two first rectangular slots that form a figure-eight structure. The outer end of the third magnetic isolation air gap 12 extends outward to the outer circle of the rotor lamination and is not connected to the outer circle of the rotor lamination, the outer end of the first rectangular slot, or the left end of the first semi-circular slot. A fourth magnetic isolation air gap 14, penetrating the thickness of the rotor lamination, is provided between the lower end of the first rectangular slot on the right side of the two first rectangular slots that form a figure-eight structure and the second rectangular slot.The inner end of the fourth magnetic isolation air gap 14 is connected to the lower end of the right side of the first rectangular slot of the two first rectangular slots with a figure-eight structure, and the width of the fourth magnetic isolation air gap 14 is smaller than the width of the right side of the two first rectangular slots with a figure-eight structure. The outer end of the fourth magnetic isolation air gap 14 extends outward to the outer circle of the rotor lamination and is not connected to the outer circle of the rotor lamination, the outer end of the second rectangular slot, or the right end of the first semi-circular slot. Along a clockwise direction, near the outer circumference of the rotor lamination, to the left of the center line of the second N magnetic pole and to the right of the center line forming an angle of 22.5° with the center line of the second N magnetic pole, a third rectangular slot penetrating the thickness of the rotor lamination is provided. The center line of the length direction of the third rectangular slot is parallel to the center line of the second N magnetic pole. At the outer end of the third rectangular slot, a third arc-shaped magnetic isolation gap penetrating the thickness of the rotor lamination is provided. The outer end of the third arc-shaped magnetic isolation gap is not connected to the outer circumference of the rotor lamination. The inner end of the third arc-shaped magnetic isolation gap is connected to the outer end of the third rectangular slot, and the diameter of the circle forming the third arc-shaped magnetic isolation gap is larger than the width of the third rectangular slot. At the inner end of the third rectangular slot, a space penetrating the thickness of the rotor lamination is provided. The eighteenth rectangular slot has an upper end that connects to the inner end of the third rectangular slot, and the length of the eighteenth rectangular slot is less than the width of the third rectangular slot. At the lower end of the eighteenth rectangular slot, there is a fifth magnetic isolation air gap 25 that penetrates the thickness of the rotor lamination and runs tangentially. The upper end of the fifth magnetic isolation air gap 25 connects to the lower end of the eighteenth rectangular slot. The left end of the fifth magnetic isolation air gap 25 is on the same straight line as the left end of the eighteenth rectangular slot. The right end of the fifth magnetic isolation air gap 25 is to the left of the center line of the second N magnetic pole. The lower end of the fifth magnetic isolation air gap 25 is not connected to the inner circle of the rotor lamination. It is located near the outer circle of the rotor lamination and to the right of the center line of the second N magnetic pole, with an angle of 22° with the center line of the second N magnetic pole.A fourth rectangular slot, penetrating the thickness of the rotor lamination, is provided to the left of the 5° centerline. The centerline of the fourth rectangular slot along its length is parallel to the centerline of the second N magnetic pole. The fourth rectangular slot and the third rectangular slot are symmetrical about the centerline of the second N magnetic pole. A fourth arc-shaped magnetic air gap, penetrating the thickness of the rotor lamination, is provided at the outer end of the fourth rectangular slot. The outer end of the fourth arc-shaped magnetic air gap is not connected to the outer circle of the rotor lamination. The inner end of the fourth arc-shaped magnetic air gap is connected to the outer end of the fourth rectangular slot, and the diameter of the circle forming the fourth arc-shaped magnetic air gap is greater than the width of the fourth rectangular slot. A nineteenth rectangular slot, penetrating the thickness of the rotor lamination, is provided at the inner end of the fourth rectangular slot. The upper end of the nineteenth rectangular slot is connected to the inner end of the fourth rectangular slot, and the length of the nineteenth rectangular slot is less than that of the fourth rectangular slot. The width of the rotor lamination is such that a sixth magnetic air gap 29, penetrating the thickness of the rotor lamination and extending tangentially, is provided at the lower end of the nineteenth rectangular slot. The upper end of the sixth magnetic air gap 29 is connected to the lower end of the nineteenth rectangular slot, and the right end of the sixth magnetic air gap 29 is on the same straight line as the right end of the nineteenth rectangular slot. The left end of the sixth magnetic air gap 29 is to the right of the center line of the second N magnetic pole and is not connected to the right end of the fifth magnetic air gap 25. The lower end of the sixth magnetic air gap 29 is not connected to the inner circle of the rotor lamination, and the lower end of the sixth magnetic air gap 29 is on the same straight line as the lower end of the fifth magnetic air gap 25. Near the outer circle of the rotor lamination and on the center line of the second N magnetic pole, two fifth rectangular slots with an inverted "V" shape are provided, penetrating the thickness of the rotor lamination. The outer ends of the two fifth rectangular slots in the V-shape are not connected to the outer circle of the rotor lamination. The inner ends of the two fifth rectangular slots in the inverted V-shape are not connected. Below the inner ends of the two fifth rectangular slots in the inverted V-shape, above the fifth magnetic air gap 25 and the sixth magnetic air gap 29, to the right of the third rectangular slot, and to the left of the fourth rectangular slot, there is a sixth rectangular slot that penetrates the thickness of the rotor lamination along the tangential direction. The upper end of the sixth rectangular slot is not connected to the inner ends of the two fifth rectangular slots in the inverted V-shape. The lower end of the sixth rectangular slot is not connected to the upper ends of the fifth magnetic air gap 25 and the sixth magnetic air gap 29. At the left end of the sixth rectangular slot, there is a seventh magnetic air gap 23 that penetrates the thickness of the rotor lamination. The inner end of the seventh magnetic air gap 23 is connected to the sixth rectangular slot. The left end is connected, and the width of the seventh magnetic isolation air gap 23 is smaller than the width of the sixth rectangular slot. The outer end of the seventh magnetic isolation air gap 23 extends outward to the outer circle of the rotor lamination and is not connected to the outer circle of the rotor lamination, the outer end of the third rectangular slot, or the outer ends of the fifth rectangular slots on the left side of the two fifth rectangular slots with an inverted "V" shape. An eighth magnetic isolation air gap 27 penetrating the thickness of the rotor lamination is provided at the right end of the sixth rectangular slot. The inner end of the eighth magnetic isolation air gap 27 is connected to the right end of the sixth rectangular slot, and the width of the eighth magnetic isolation air gap 27 is smaller than the width of the sixth rectangular slot. The outer end of the eighth magnetic isolation air gap 27 extends outward to the outer circle of the rotor lamination and is not connected to the outer circle of the rotor lamination, the outer end of the fourth rectangular slot, or the outer ends of the fifth rectangular slots on the right side of the two fifth rectangular slots with an inverted "V" shape. Along a clockwise direction, near the outer circle of the rotor lamination, to the left of the center line of the third N magnetic pole and to the right of the center line at an angle of 22.5° to the center line of the third N magnetic pole, a fifth rectangular slot penetrating the thickness of the rotor lamination is provided. The center line of the fifth rectangular slot along its length is parallel to the center line of the third N magnetic pole. At the outer end of the fifth rectangular slot, a fifth arc-shaped magnetic isolation gap penetrating the thickness of the rotor lamination is provided. The outer end of the fifth arc-shaped magnetic isolation gap is not connected to the outer circle of the rotor lamination. The inner end of the fifth arc-shaped magnetic isolation gap is connected to the outer end of the fifth rectangular slot, and the diameter of the circle forming the fifth arc-shaped magnetic isolation gap is larger than the width of the fifth rectangular slot. At the inner end of the fifth rectangular slot, a twentieth rectangular slot penetrating the thickness of the rotor lamination is provided. The upper end of the twentieth rectangular slot is connected to the inner end of the fifth rectangular slot, and the... The length of the twentieth rectangular slot is less than the width of the fifth rectangular slot. A ninth magnetic isolation air gap 31, penetrating the thickness of the rotor lamination and extending tangentially, is provided at the lower end of the twentieth rectangular slot. The upper end of the ninth magnetic isolation air gap 31 is connected to the lower end of the twentieth rectangular slot. The left end of the ninth magnetic isolation air gap 31 is on the same straight line as the left end of the twentieth rectangular slot. The right end of the ninth magnetic isolation air gap 31 is to the left of the center line of the third N magnetic pole. The lower end of the ninth magnetic isolation air gap 31 is not connected to the inner circle of the rotor lamination. Near the outer circle of the rotor lamination, to the right of the center line of the third N magnetic pole and to the left of the center line at an angle of 22.5° to the center line of the third N magnetic pole, a sixth rectangular slot, penetrating the thickness of the rotor lamination, is provided. The center line of the sixth rectangular slot is parallel to the center line of the third N magnetic pole. The sixth rectangular slot is parallel to the fifth rectangular slot. The square slots are symmetrical about the center line of the third N magnetic pole. The outer end of the sixth rectangular slot has a sixth arc-shaped magnetic air gap penetrating the thickness of the rotor lamination. The outer end of the sixth arc-shaped magnetic air gap is not connected to the outer circle of the rotor lamination. The inner end of the sixth arc-shaped magnetic air gap is connected to the outer end of the sixth rectangular slot, and the diameter of the circle forming the sixth arc-shaped magnetic air gap is larger than the width of the sixth rectangular slot. The inner end of the sixth rectangular slot has a twenty-first rectangular slot penetrating the thickness of the rotor lamination. The upper end of the twenty-first rectangular slot is connected to the inner end of the sixth rectangular slot, and the length of the twenty-first rectangular slot is smaller than the width of the sixth rectangular slot. The lower end of the twenty-first rectangular slot has a tenth magnetic air gap 39 penetrating the thickness of the rotor lamination along the tangential direction. The upper end of the tenth magnetic air gap 39 is connected to the lower end of the twenty-first rectangular slot. The right end of the tenth magnetic gap 39 is on the same straight line as the right end of the twenty-first rectangular slot. The left end of the tenth magnetic gap 39 is to the right of the center line of the third N magnetic pole. The left end of the tenth magnetic gap 39 is not connected to the right end of the ninth magnetic gap 31. The lower end of the tenth magnetic gap 39 is not connected to the inner circle of the rotor lamination. The lower end of the tenth magnetic gap 39 is on the same straight line as the lower end of the ninth magnetic gap 31. Near the outer circle of the rotor lamination and between the center line of the third N magnetic pole and the fifth rectangular slot, there is an eleventh rectangular slot that penetrates the thickness of the rotor lamination. The center line of the eleventh rectangular slot in the length direction is parallel to the center line of the third N magnetic pole. The outer end of the eleventh rectangular slot is not connected to the outer circle of the rotor lamination. The inner end of the eleventh rectangular slot has a twenty-second rectangular slot that penetrates the thickness of the rotor lamination.The upper end of the 22nd rectangular slot is connected to the inner end of the 11th rectangular slot, and the length of the 22nd rectangular slot is less than the width of the 11th rectangular slot. At the lower end of the 22nd rectangular slot, a 13th magnetic isolation gap 35 is provided, penetrating the thickness of the rotor lamination along the tangential direction. The upper left end of the 13th magnetic isolation gap 35 is connected to the lower end of the 22nd rectangular slot, and the left end of the 13th magnetic isolation gap 35 is on the same straight line as the left end of the 22nd rectangular slot. Near the outer circumference of the rotor lamination, and between the center line of the third N magnetic pole and the sixth rectangular slot, a 12th rectangular slot is provided, penetrating the thickness of the rotor lamination. The center line of the 12th rectangular slot along its length is parallel to the center line of the third N magnetic pole. The 12th rectangular slot and the 11th rectangular slot are located about the third N... The magnetic pole centerlines are symmetrical. The outer end of the twelfth rectangular slot is not connected to the outer circle of the rotor lamination. A twenty-third rectangular slot, penetrating the thickness of the rotor lamination, is provided at the inner end of the twelfth rectangular slot. The upper end of the twenty-third rectangular slot is connected to the inner end of the twelfth rectangular slot, and the length of the twenty-third rectangular slot is less than the width of the twelfth rectangular slot. The lower end of the twenty-third rectangular slot is connected to the upper right end of the thirteenth magnetic gap 35. The right end of the twenty-third rectangular slot and the right end of the thirteenth magnetic gap 35 are on the same straight line. Near the outer circle of the rotor lamination and between the eleventh rectangular slot and the fifth rectangular slot, a ninth rectangular slot, penetrating the thickness of the rotor lamination, is provided. The outer end of the ninth rectangular slot is connected to the outer circle of the rotor lamination, the outer end of the eleventh rectangular slot, and the fifth rectangular slot. The outer ends of the slots are not connected. An eleventh magnetic air gap 32, penetrating the thickness of the rotor lamination, is provided at the inner end of the ninth rectangular slot. The left end of the eleventh magnetic air gap 32 is connected to the inner end of the ninth rectangular slot, and the width of the eleventh magnetic air gap 32 is smaller than the width of the ninth rectangular slot. The right end of the eleventh magnetic air gap 32 is to the left of the center line of the third N magnetic pole. The upper end of the eleventh magnetic air gap 32 is not connected to the lower end of the thirteenth magnetic air gap 35, and the lower end of the eleventh magnetic air gap 32 is not connected to the upper end of the ninth magnetic air gap 31. A tenth rectangular slot, penetrating the thickness of the rotor lamination, is provided near the outer circle of the rotor lamination and between the twelfth rectangular slot and the sixth rectangular slot. The outer end of the tenth rectangular slot is connected to the outer circle of the rotor lamination and the twelfth rectangular slot. The outer ends of the tenth rectangular slot and the sixth rectangular slot are not connected. A twelfth magnetic air gap 37, penetrating the thickness of the rotor lamination, is provided at the inner end of the tenth rectangular slot. The right end of the twelfth magnetic air gap 37 is connected to the inner end of the tenth rectangular slot, and the width of the twelfth magnetic air gap 37 is less than the width of the tenth rectangular slot. The left end of the twelfth magnetic air gap 37 is to the right of the center line of the third N magnetic pole. The left end of the twelfth magnetic air gap 37 is not connected to the right end of the eleventh magnetic air gap 32. The upper end of the twelfth magnetic air gap 37 is not connected to the lower end of the thirteenth magnetic air gap 35. The lower end of the twelfth magnetic air gap 37 is not connected to the upper end of the tenth magnetic air gap 39. The lower end of the twelfth magnetic air gap 37 and the lower end of the eleventh magnetic air gap 32 are on the same straight line. Between the second and third rectangular slots, and on the center line of the first S magnetic pole near the outer circle of the rotor lamination, a fourteenth magnetic isolation gap 20 is provided in the radial direction, penetrating the thickness of the rotor lamination. The outer end of the fourteenth magnetic isolation gap 20 is not connected to the outer circle of the rotor lamination. Near the outer circle of the rotor lamination and between the fourteenth magnetic isolation gap 20 and the second rectangular slot, a second rectangular slot is provided, penetrating the thickness of the rotor lamination. The outer end of the second rectangular slot is not connected to either the outer circle of the rotor lamination or the outer end of the second rectangular slot. Inside the second rectangular slot, a fifteenth magnetic isolation gap 19 is provided, penetrating the thickness of the rotor lamination. The left end of the fifteenth magnetic isolation gap 19 is connected to the inner end of the second rectangular slot, and the width of the fifteenth magnetic isolation gap 19 is smaller than the width of the second rectangular slot. The right end of the fifteenth magnetic isolation gap 19 is connected to the fourteenth magnetic isolation gap 20. Near the outer circle of the rotor lamination and between the fourteenth magnetic isolation gap 20 and the second rectangular slot, a fourth rectangular slot is provided, penetrating the thickness of the rotor lamination. The outer end of the fourth rectangular slot is connected to both the outer circle of the rotor lamination and the outer circle of the second rectangular slot. The outer end of the slot and the outer end of the fourteenth magnetic air gap 20 are not connected. A sixteenth magnetic air gap 18, penetrating the thickness of the rotor lamination, is provided at the inner end of the fourth rectangular slot. The left end of the sixteenth magnetic air gap 18 is connected to the inner end of the fourth rectangular slot, and the width of the sixteenth magnetic air gap 18 is smaller than the width of the fourth rectangular slot. The right end of the sixteenth magnetic air gap 18 is connected to the fourteenth magnetic air gap 20. The lower end of the sixteenth magnetic air gap 18 is not connected to the upper end of the fifteenth magnetic air gap 19. Near the outer circumference of the rotor lamination and at the fourteenth magnetic air gap... A third rectangular slot that penetrates the thickness of the rotor lamination is provided between the air gap 20 and the third rectangular slot. The outer end of the third rectangular slot is not connected to the outer circle of the rotor lamination, the outer end of the fourteenth magnetic air gap 20, or the outer end of the third rectangular slot. A twenty-fourth rectangular slot that penetrates the thickness of the rotor lamination is provided at the inner end of the third rectangular slot. The upper end of the twenty-fourth rectangular slot is connected to the inner end of the third rectangular slot, and the width of the twenty-fourth rectangular slot is smaller than the width of the third rectangular slot. The lower end of the twenty-fourth rectangular slot is connected to the inner end of the fourteenth magnetic air gap 20. In the clockwise direction, between the fourth rectangular slot and the fifth rectangular slot, on the center line of the second S magnetic pole and near the outer circle of the rotor lamination, a second semicircular slot penetrating through the thickness of the rotor lamination is provided, the inner arc surface of the second semicircular slot faces the outer circle of the rotor lamination, and the outer end of the second semicircular slot is not communicated with the outer circle of the rotor lamination; on the center line of the second S magnetic pole and directly below the second semicircular slot, a herringbone magnetic-isolating air gap 45 penetrating through the thickness of the rotor lamination is provided, the upper end of the herringbone magnetic-isolating air gap 45 is not communicated with the lower end of the second semicircular slot; at the left lower end of the herringbone magnetic-isolating air gap 45, an eighth rectangular slot penetrating through the thickness of the rotor lamination is provided, the upper end of the eighth rectangular slot is communicated with the left lower end of the herringbone magnetic-isolating air gap 45, and the width of the eighth rectangular slot is greater than the width of the left lower end of the herringbone magnetic-isolating air gap 45; between the lower end of the eighth rectangular slot and the fourth rectangular slot, a seventeenth magnetic-isolating air gap 43 penetrating through the thickness of the rotor lamination is provided, the inner end of the seventeenth magnetic-isolating air gap 43 is communicated with the lower end of the eighth rectangular slot, and the width of the seventeenth magnetic-isolating air gap 43 is smaller than the width of the eighth rectangular slot; the outer end of the seventeenth magnetic-isolating air gap 43 extends outward to the outer circle of the rotor lamination and is not communicated with the outer circle of the rotor lamination, the left end of the second semicircular slot and the outer end of the fourth rectangular slot; at the right lower end of the herringbone magnetic-isolating air gap 45, a seventh rectangular slot penetrating through the thickness of the rotor lamination is provided, the upper end of the seventh rectangular slot is communicated with the right lower end of the herringbone magnetic-isolating air gap 45, and the width of the seventh rectangular slot is greater than the width of the right lower end of the herringbone magnetic-isolating air gap 45; between the lower end of the seventh rectangular slot and the fifth rectangular slot, an eighteenth magnetic-isolating air gap 48 penetrating through the thickness of the rotor lamination is provided, the inner end of the eighteenth magnetic-isolating air gap 48 is communicated with the lower end of the seventh rectangular slot, and the width of the eighteenth magnetic-isolating air gap 48 is smaller than the width of the seventh rectangular slot; the outer end of the eighteenth magnetic-isolating air gap 48 extends outward to the outer circle of the rotor lamination and is not communicated with the outer circle of the rotor lamination, the right end of the second semicircular slot and the outer end of the fifth rectangular slot; Along a clockwise direction, between the sixth rectangular slot and the first rectangular slot, on the center line of the third S magnetic pole and near the outer circle of the rotor lamination, a nineteenth magnetic isolation gap 41 is provided in the radial direction, penetrating the thickness of the rotor lamination. The outer end of the nineteenth magnetic isolation gap 41 is not connected to the outer circle of the rotor lamination. Near the outer circle of the rotor lamination and between the nineteenth magnetic isolation gap 41 and the sixth rectangular slot, a thirteenth rectangular slot is provided, penetrating the thickness of the rotor lamination. The outer end of the thirteenth rectangular slot is not connected to the outer circle of the rotor lamination, the outer end of the sixth rectangular slot, or the outer end of the nineteenth magnetic isolation gap 41. The inner end of the thirteenth rectangular slot is provided, penetrating the thickness of the rotor lamination. The 25th rectangular slot has its upper end connected to the inner end of the 13th rectangular slot, and its width is smaller than that of the 13th rectangular slot. Its lower end is connected to the inner end of the 19th magnetic gap 41. Near the outer circumference of the rotor lamination, between the 19th magnetic gap 41 and the first rectangular slot, is a 14th rectangular slot that penetrates the thickness of the rotor lamination. The centerline of the 14th rectangular slot along its length is parallel to the centerline of the third S-pole. The outer end of the 14th rectangular slot is not connected to the outer circumference of the rotor lamination or the outer end of the first rectangular slot. A 26th rectangular slot, penetrating the thickness of the rotor lamination, is located at the inner end of the 14th rectangular slot. The 26th rectangular slot has its upper end connected to the inner end of the 14th rectangular slot, and its length is less than the width of the 14th rectangular slot. A 20th magnetic air gap 42, penetrating the thickness of the rotor lamination, is provided at the lower end of the 26th rectangular slot. The upper end of the 20th magnetic air gap 42 is connected to the lower end of the 26th rectangular slot, and its length is greater than the length of the 26th rectangular slot. The right end of the 20th magnetic air gap 42 is on the same straight line as the right end of the 26th rectangular slot. A 27th rectangular slot, penetrating the thickness of the rotor lamination, is provided at the left end of the 20th magnetic air gap 42. The right end of the 27th rectangular slot is connected to the inner end of the 20th magnetic air gap 42. The left end of the air gap 42 is connected. The lower end of the 27th rectangular slot is on the same straight line as the lower end of the 20th magnetic air gap 42. The 15th rectangular slot, which penetrates the thickness of the rotor lamination, is provided at the left end of the 27th rectangular slot. The right end of the 15th rectangular slot is connected to the left end of the 27th rectangular slot, and the length of the 27th rectangular slot is less than the width of the 15th rectangular slot. The 28th rectangular slot, which penetrates the thickness of the rotor lamination, is provided at the left end of the 15th rectangular slot. The right end of the 28th rectangular slot is connected to the left end of the 15th rectangular slot, and the length of the 28th rectangular slot is less than the width of the 15th rectangular slot. The left end of the 28th rectangular slot is connected to the 19th magnetic air gap 41. The rotor laminations are stacked and welded with the burrs facing in one direction to form the rotor core 3. A first rectangular ferrite permanent magnet 11 is installed in a first rectangular slot with its right end face as the N pole. A second rectangular ferrite permanent magnet 15 is installed in a second rectangular slot with its left end face as the N pole. A first semi-circular neodymium iron boron permanent magnet 4 is installed in a first semi-circular slot with its inner arc surface as the N pole. Two identical first rectangular neodymium iron boron permanent magnets 13 are installed in two first rectangular slots forming a V-shape, with their opposite sides both having N poles on their back sides, forming the first N pole of the permanent magnet rotor. A second rectangular neodymium iron boron permanent magnet 16 is installed in a second rectangular slot with its right end face as the S pole. Within the rectangular slots, the third rectangular NdFeB permanent magnet 21 is installed with its left end face polarity as the S pole, and the fourth rectangular NdFeB permanent magnet 17 is installed with its right end face polarity as the S pole, forming the first S pole of the permanent magnet rotor. The third rectangular ferrite permanent magnet 22 is installed with its right end face polarity as the N pole, and the fourth rectangular ferrite permanent magnet 28 is installed with its left end face polarity as the N pole, and two identical fifth rectangular NdFeB permanent magnets 24 are installed with their opposite sides polarity as the N pole in two fifth rectangular slots forming an inverted "V" shape. The sixth rectangular NdFeB permanent magnet 26 is installed with its top end face polarity as the N pole in the sixth rectangular slot. Within the shaped slot, the second N pole of the permanent magnet rotor is formed. A second semi-circular NdFeB permanent magnet 46 is installed in the second semi-circular slot with its inner arc surface polarity as the S pole. A seventh rectangular NdFeB permanent magnet 47 is installed in the seventh rectangular slot with its upper end face polarity as the S pole. An eighth rectangular NdFeB permanent magnet 44 is installed in the eighth rectangular slot with its upper end face polarity as the S pole, forming the second S pole of the permanent magnet rotor. A fifth rectangular ferrite permanent magnet 30 is installed in the fifth rectangular slot with its right end face polarity as the N pole. A sixth rectangular ferrite permanent magnet 40 is installed in the sixth rectangular slot with its left end face polarity as the N pole. A ninth rectangular NdFeB permanent magnet 33 is installed in the ninth rectangular slot with its right end face polarity as the N pole. The tenth rectangular NdFeB permanent magnet 38 is installed in the tenth rectangular slot with its left end face polarity as N. The eleventh rectangular NdFeB permanent magnet 34 is installed in the eleventh rectangular slot with its right end face polarity as N. The twelfth rectangular NdFeB permanent magnet 36 is installed in the twelfth rectangular slot with its left end face polarity as N, forming the third N pole of the permanent magnet rotor. The thirteenth rectangular NdFeB permanent magnet 6 is installed in the thirteenth rectangular slot with its right end face polarity as S. The fourteenth rectangular NdFeB permanent magnet 8 is installed in the fourteenth rectangular slot with its left end face polarity as S. The fifteenth rectangular NdFeB permanent magnet 7 is installed in the fifteenth rectangular slot with its top end face polarity as S, forming the third S pole of the permanent magnet rotor, and so on.A composite excitation and focusing permanent magnet rotor is formed by alternating N and S poles of ferrite permanent magnet steel and neodymium iron boron permanent magnet steel.

Claims

1. A ferrite and neodymium iron boron permanent magnet composite excitation and focusing motor, comprising a front end cover (9), a rear end cover (2), a rotor, and a stator, characterized in that: The permanent magnet rotor is a composite excitation-focusing magnetic pole structure of ferrite permanent magnet steel and neodymium iron boron permanent magnet steel; Permanent magnet rotor with composite excitation and magnetic concentration type magnetic poles of ferrite permanent magnet steel and neodymium iron boron permanent magnet steel comprises a shaft (1), a rotor core (3), a first rectangular ferrite permanent magnet steel (11), a second rectangular ferrite permanent magnet steel (15), a third rectangular ferrite permanent magnet steel (22), a fourth rectangular ferrite permanent magnet steel (28), a fifth rectangular ferrite permanent magnet steel (30), a sixth rectangular ferrite permanent magnet steel (40), a first rectangular neodymium iron boron permanent magnet steel (13), a second rectangular neodymium iron boron permanent magnet steel (16), a third rectangular neodymium iron boron permanent magnet steel (21), a fourth rectangular neodymium iron boron permanent magnet steel (17), a fifth rectangular neodymium iron boron permanent magnet steel (24), a sixth rectangular neodymium iron boron permanent magnet steel (26), a seventh rectangular neodymium iron boron permanent magnet steel (47), an eighth rectangular neodymium iron boron permanent magnet steel (44), a ninth rectangular neodymium iron boron permanent magnet steel (33), a tenth rectangular neodymium iron boron permanent magnet steel (38), an eleventh rectangular neodymium iron boron permanent magnet steel (34), a twelfth rectangular neodymium iron boron permanent magnet steel (36), a thirteenth rectangular neodymium iron boron permanent magnet steel (6), a fourteenth rectangular neodymium iron boron permanent magnet steel (8), a fifteenth rectangular neodymium iron boron permanent magnet steel (7), a first semicircular neodymium iron boron permanent magnet steel (4), a second semicircular neodymium iron boron permanent magnet steel (46), a first magnetic-isolating air gap (10), a second magnetic-isolating air gap (5), a third magnetic-isolating air gap (12), a fourth magnetic-isolating air gap (14), a fifth magnetic-isolating air gap (25), a sixth magnetic-isolating air gap (29), a seventh magnetic-isolating air gap (23), an eighth magnetic-isolating air gap (27), a ninth magnetic-isolating air gap (31), a tenth magnetic-isolating air gap (39), an eleventh magnetic-isolating air gap (32), a twelfth magnetic-isolating air gap (37), a thirteenth magnetic-isolating air gap (35), a fourteenth magnetic-isolating air gap (20), a fifteenth magnetic-isolating air gap (19), a sixteenth magnetic-isolating air gap (18), a seventeenth magnetic-isolating air gap (43), an eighteenth magnetic-isolating air gap (48), a nineteenth magnetic-isolating air gap (41), a twentieth magnetic-isolating air gap (42), and a herringbone-shaped magnetic-isolating air gap (45). A first rectangular slot penetrating through the thickness of the rotor lamination is provided near the outer circle of the rotor lamination, on the left side of the center line of the first N magnetic pole and on the right side of the center line at an included angle of 22.5° with the center line of the first N magnetic pole. The center line in the length direction of the first rectangular slot is parallel to the center line of the first N magnetic pole. A first arc-shaped magnetic-isolating air gap penetrating through the thickness of the rotor lamination is arranged at the outer end of the first rectangular slot. The outer end of the first arc-shaped magnetic-isolating air gap is not communicated with the outer circle of the rotor lamination, the inner end of the first arc-shaped magnetic-isolating air gap is communicated with the outer end of the first rectangular slot, and the diameter of the circle where the first arc-shaped magnetic-isolating air gap is located is larger than the width of the first rectangular slot. A sixteenth rectangular slot penetrating through the thickness of the rotor lamination is arranged at the inner end of the first rectangular slot, the upper end of the sixteenth rectangular slot is communicated with the inner end of the first rectangular slot, and the length of the sixteenth rectangular slot is smaller than the width of the first rectangular slot. A first magnetic-isolating air gap (10) extending in the tangential direction and penetrating through the thickness of the rotor lamination is arranged at the lower end of the sixteenth rectangular slot. The upper end of the first magnetic-isolating air gap (10) is communicated with the lower end of the sixteenth rectangular slot, and the left end of the first magnetic-isolating air gap (10) and the left end of the sixteenth rectangular slot are on the same straight line.The right end of the first magnetic isolation air gap (10) is to the left of the center line of the first N magnetic pole. The lower end of the first magnetic isolation air gap (10) is not connected to the inner circle of the rotor lamination. Near the outer circle of the rotor lamination, to the right of the center line of the first N magnetic pole and to the left of the center line with an angle of 22.5° with the center line of the first N magnetic pole, a second rectangular groove penetrating the thickness of the rotor lamination is provided. The center line of the length direction of the second rectangular groove is parallel to the center line of the first N magnetic pole. The second rectangular groove and the first rectangular groove are symmetrical about the center line of the first N magnetic pole. The outer end of the second rectangular groove is provided with a second arc-shaped magnetic isolation air gap penetrating the thickness of the rotor lamination. The outer end of the second arc-shaped magnetic isolation air gap is not connected to the outer circle of the rotor lamination. The inner end of the second arc-shaped magnetic isolation air gap is connected to the outer end of the second rectangular groove and forms a second arc. The diameter of the circular magnetic gap is larger than the width of the second rectangular slot. A seventeenth rectangular slot penetrating the thickness of the rotor lamination is provided at the inner end of the second rectangular slot. The upper end of the seventeenth rectangular slot is connected to the inner end of the second rectangular slot, and the length of the seventeenth rectangular slot is smaller than the width of the second rectangular slot. A second magnetic gap (5) penetrating the thickness of the rotor lamination along the tangential direction is provided at the lower end of the seventeenth rectangular slot. The upper end of the second magnetic gap (5) is connected to the lower end of the seventeenth rectangular slot. The right end of the second magnetic gap (5) is on the same straight line as the right end of the seventeenth rectangular slot. The left end of the second magnetic gap (5) is to the right of the center line of the first N magnetic pole. The left end of the second magnetic gap (5) is not connected to the right end of the first magnetic gap (10). The lower end of the second magnetic gap (5) is connected to the inner end of the rotor lamination. The circles are not connected. The lower end of the second magnetic air gap (5) and the lower end of the first magnetic air gap (10) are on the same straight line. Near the outer circle of the rotor lamination and on the center line of the first N magnetic pole, there is a first semi-circular groove that penetrates the thickness of the rotor lamination. The inner arc surface of the first semi-circular groove faces the outer circle of the rotor lamination. The outer end of the first semi-circular groove is not connected to the outer circle of the rotor lamination. Between the lower end of the first semi-circular groove and the upper end of the first magnetic air gap (10) and the second magnetic air gap (5) and on the center line of the first N magnetic pole, there are two first rectangular grooves with a "V" shape that penetrate the thickness of the rotor lamination. The upper ends of the two first rectangular grooves with a "V" shape are not connected. The upper ends of the two first rectangular grooves with a "V" shape are connected to the outer arc surface of the first semi-circular groove. The bottom ends of the two first rectangular slots in the figure-eight shape are not connected. The bottom end of the first rectangular slot on the left is not connected to the top end of the first magnetic isolation air gap (10). The bottom end of the first rectangular slot on the right is not connected to the top end of the second magnetic isolation air gap (5). A third magnetic isolation air gap (12) penetrating the thickness of the rotor lamination is provided between the bottom end of the first rectangular slot on the left and the first rectangular slot in the figure-eight shape. The inner end of the third magnetic isolation air gap (12) is connected to the bottom end of the first rectangular slot on the left of the two first rectangular slots in the figure-eight shape, and the width of the third magnetic isolation air gap (12) is smaller than the width of the first rectangular slot on the left of the two first rectangular slots in the figure-eight shape.The outer end of the third magnetic isolation air gap (12) extends outward to the outer circle of the rotor lamination and is not connected to the outer circle of the rotor lamination, the outer end of the first rectangular slot, or the left end of the first semi-circular slot. A fourth magnetic isolation air gap (14) penetrating the thickness of the rotor lamination is provided between the lower end of the first rectangular slot on the right side of the two first rectangular slots in a figure-eight shape and the second rectangular slot. The inner end of the fourth magnetic isolation air gap (14) is connected to the lower end of the first rectangular slot on the right side of the two first rectangular slots in a figure-eight shape, and the width of the fourth magnetic isolation air gap (14) is smaller than the width of the first rectangular slot on the right side of the two first rectangular slots in a figure-eight shape. The outer end of the fourth magnetic isolation air gap (14) extends outward to the outer circle of the rotor lamination and is not connected to the outer circle of the rotor lamination, the outer end of the second rectangular slot, or the right end of the first semi-circular slot. Along a clockwise direction, near the outer circumference of the rotor lamination, to the left of the center line of the second N magnetic pole and to the right of the center line at an angle of 22.5° to the center line of the second N magnetic pole, a third rectangular slot penetrating the thickness of the rotor lamination is provided. The center line of the length direction of the third rectangular slot is parallel to the center line of the second N magnetic pole. At the outer end of the third rectangular slot, a third arc-shaped magnetic isolation gap penetrating the thickness of the rotor lamination is provided. The outer end of the third arc-shaped magnetic isolation gap is not connected to the outer circumference of the rotor lamination. The inner end of the third arc-shaped magnetic isolation gap is connected to the outer end of the third rectangular slot, and the diameter of the circle forming the third arc-shaped magnetic isolation gap is larger than the width of the third rectangular slot. At the inner end of the third rectangular slot, an eighteenth rectangular slot penetrating the thickness of the rotor lamination is provided. The upper end of the eighteenth rectangular slot is connected to the inner end of the third rectangular slot, and the eighteenth... The length of the rectangular slot is less than the width of the third rectangular slot. A fifth magnetic air gap (25) penetrating the thickness of the rotor lamination along the tangential direction is provided at the lower end of the eighteenth rectangular slot. The upper end of the fifth magnetic air gap (25) is connected to the lower end of the eighteenth rectangular slot. The left end of the fifth magnetic air gap (25) is on the same straight line as the left end of the eighteenth rectangular slot. The right end of the fifth magnetic air gap (25) is to the left of the center line of the second N magnetic pole. The lower end of the fifth magnetic air gap (25) is not connected to the inner circle of the rotor lamination. A fourth rectangular slot penetrating the thickness of the rotor lamination is provided near the outer circle of the rotor lamination, to the right of the center line of the second N magnetic pole, and to the left of the center line at an angle of 22.5° to the center line of the second N magnetic pole. The center line of the fourth rectangular slot along its length is parallel to the center line of the second N magnetic pole. The square slot and the third rectangular slot are symmetrical about the center line of the second N magnetic pole. The outer end of the fourth rectangular slot is provided with a fourth arc-shaped magnetic air gap that penetrates the thickness of the rotor lamination. The outer end of the fourth arc-shaped magnetic air gap is not connected to the outer circle of the rotor lamination. The inner end of the fourth arc-shaped magnetic air gap is connected to the outer end of the fourth rectangular slot, and the diameter of the circle of the fourth arc-shaped magnetic air gap is greater than the width of the fourth rectangular slot. The inner end of the fourth rectangular slot is provided with a nineteenth rectangular slot that penetrates the thickness of the rotor lamination. The upper end of the nineteenth rectangular slot is connected to the inner end of the fourth rectangular slot, and the length of the nineteenth rectangular slot is less than the width of the fourth rectangular slot. The lower end of the nineteenth rectangular slot is provided with a sixth magnetic air gap (29) that penetrates the thickness of the rotor lamination along the tangential direction. The upper end of the sixth magnetic air gap (29) is connected to the nineteenth rectangular slot. The lower end of the slot is connected. The right end of the sixth magnetic gap (29) is on the same straight line as the right end of the nineteenth rectangular slot. The left end of the sixth magnetic gap (29) is to the right of the center line of the second N magnetic pole. The left end of the sixth magnetic gap (29) is not connected to the right end of the fifth magnetic gap (25). The lower end of the sixth magnetic gap (29) is not connected to the inner circle of the rotor lamination. The lower end of the sixth magnetic gap (29) is on the same straight line as the lower end of the fifth magnetic gap (25). Near the outer circle of the rotor lamination and on the center line of the second N magnetic pole, there are two fifth rectangular slots with an inverted "V" shape that penetrate the thickness of the rotor lamination. The outer ends of the two fifth rectangular slots with an inverted "V" shape are not connected to the outer circle of the rotor lamination. The inner ends of the two fifth rectangular slots with an inverted "V" shape are not connected.Below the inner ends of the two fifth rectangular slots in an inverted "V" shape, above the fifth magnetic air gap (25) and the sixth magnetic air gap (29), to the right of the third rectangular slot, and to the left of the fourth rectangular slot, there is a sixth rectangular slot that penetrates the thickness of the rotor lamination along the tangential direction. The upper end of the sixth rectangular slot is not connected to the inner ends of the two fifth rectangular slots in an inverted "V" shape, and the lower end of the sixth rectangular slot is not connected to the upper ends of the fifth magnetic air gap (25) and the sixth magnetic air gap (29). At the left end of the sixth rectangular slot, there is a seventh magnetic air gap (23) that penetrates the thickness of the rotor lamination. The inner end of the seventh magnetic air gap (23) is connected to the left end of the sixth rectangular slot, and the width of the seventh magnetic air gap (23) is smaller than that of the sixth rectangular slot. The width of the slot, the outer end of the seventh magnetic air gap (23) extends outward to the outer circle of the rotor lamination and is not connected to the outer circle of the rotor lamination, the outer end of the third rectangular slot, and the outer ends of the fifth rectangular slots on the left side of the two fifth rectangular slots with an inverted "eight" shape. An eighth magnetic air gap (27) penetrating the thickness of the rotor lamination is provided at the right end of the sixth rectangular slot. The inner end of the eighth magnetic air gap (27) is connected to the right end of the sixth rectangular slot and the width of the eighth magnetic air gap (27) is smaller than the width of the sixth rectangular slot. The outer end of the eighth magnetic air gap (27) extends outward to the outer circle of the rotor lamination and is not connected to the outer circle of the rotor lamination, the outer end of the fourth rectangular slot, and the outer ends of the fifth rectangular slots on the right side of the two fifth rectangular slots with an inverted "eight" shape. Along a clockwise direction, near the outer circle of the rotor lamination, to the left of the center line of the third N magnetic pole and to the right of the center line at an angle of 22.5° to the center line of the third N magnetic pole, a fifth rectangular slot penetrating the thickness of the rotor lamination is provided. The center line of the fifth rectangular slot along its length is parallel to the center line of the third N magnetic pole. At the outer end of the fifth rectangular slot, a fifth arc-shaped magnetic isolation gap penetrating the thickness of the rotor lamination is provided. The outer end of the fifth arc-shaped magnetic isolation gap is not connected to the outer circle of the rotor lamination. The inner end of the fifth arc-shaped magnetic isolation gap is connected to the outer end of the fifth rectangular slot, and the diameter of the circle forming the fifth arc-shaped magnetic isolation gap is larger than the width of the fifth rectangular slot. At the inner end of the fifth rectangular slot, a twentieth rectangular slot penetrating the thickness of the rotor lamination is provided. The upper end of the twentieth rectangular slot is connected to the inner end of the fifth rectangular slot, and the... The length of the twentieth rectangular slot is less than the width of the fifth rectangular slot. A ninth magnetic isolation air gap (31) penetrating the thickness of the rotor lamination and extending tangentially is provided at the lower end of the twentieth rectangular slot. The upper end of the ninth magnetic isolation air gap (31) is connected to the lower end of the twentieth rectangular slot. The left end of the ninth magnetic isolation air gap (31) is on the same straight line as the left end of the twentieth rectangular slot. The right end of the ninth magnetic isolation air gap (31) is to the left of the center line of the third N magnetic pole. The lower end of the ninth magnetic isolation air gap (31) is not connected to the inner circle of the rotor lamination. A sixth rectangular slot penetrating the thickness of the rotor lamination is provided near the outer circle of the rotor lamination, to the right of the center line of the third N magnetic pole, and to the left of the center line at an angle of 22.5° with the center line of the third N magnetic pole. The center line of the sixth rectangular slot in the length direction is parallel to the center line of the third N magnetic pole. The sixth rectangular slot is symmetrical to the fifth rectangular slot about the center line of the third N magnetic pole. The outer end of the sixth rectangular slot is provided with a sixth arc-shaped magnetic air gap that penetrates the thickness of the rotor lamination. The outer end of the sixth arc-shaped magnetic air gap is not connected to the outer circle of the rotor lamination. The inner end of the sixth arc-shaped magnetic air gap is connected to the outer end of the sixth rectangular slot, and the diameter of the circle of the sixth arc-shaped magnetic air gap is greater than the width of the sixth rectangular slot. The inner end of the sixth rectangular slot is provided with a twenty-first rectangular slot that penetrates the thickness of the rotor lamination. The upper end of the twenty-first rectangular slot is connected to the inner end of the sixth rectangular slot, and the length of the twenty-first rectangular slot is less than the width of the sixth rectangular slot. The lower end of the twenty-first rectangular slot is provided with a tenth magnetic air gap (39) that penetrates the thickness of the rotor lamination along the tangential direction. The upper end is connected to the lower end of the twenty-first rectangular slot. The right end of the tenth magnetic air gap (39) is on the same straight line as the right end of the twenty-first rectangular slot. The left end of the tenth magnetic air gap (39) is to the right of the center line of the third N magnetic pole. The left end of the tenth magnetic air gap (39) is not connected to the right end of the ninth magnetic air gap (31). The lower end of the tenth magnetic air gap (39) is not connected to the inner circle of the rotor lamination. The lower end of the tenth magnetic air gap (39) is on the same straight line as the lower end of the ninth magnetic air gap (31). Near the outer circle of the rotor lamination and between the center line of the third N magnetic pole and the fifth rectangular slot, there is an eleventh rectangular slot that penetrates the thickness of the rotor lamination. The center line of the length direction of the eleventh rectangular slot is parallel to the center line of the third N magnetic pole. The outer end of the eleventh rectangular slot is not connected to the outer circle of the rotor lamination.A 22nd rectangular slot, penetrating the thickness of the rotor lamination, is provided at the inner end of the 11th rectangular slot. The upper end of the 22nd rectangular slot is connected to the inner end of the 11th rectangular slot, and the length of the 22nd rectangular slot is less than the width of the 11th rectangular slot. A 13th magnetic air gap (35), penetrating the thickness of the rotor lamination and extending tangentially, is provided at the lower end of the 22nd rectangular slot. The upper left end of the 13th magnetic air gap (35) is connected to the lower end of the 22nd rectangular slot, and the left end of the 13th magnetic air gap (35) is on the same straight line as the left end of the 22nd rectangular slot. A 12th rectangular slot, penetrating the thickness of the rotor lamination, is provided near the outer circle of the rotor lamination and between the center line of the third N magnetic pole and the sixth rectangular slot. The center line of the 12th rectangular slot in the length direction is parallel to the center line of the third N magnetic pole. The rectangular slot is symmetrical to the eleventh rectangular slot about the center line of the third N magnetic pole. The outer end of the twelfth rectangular slot is not connected to the outer circle of the rotor lamination. The inner end of the twelfth rectangular slot is provided with a twenty-third rectangular slot that penetrates the thickness of the rotor lamination. The upper end of the twenty-third rectangular slot is connected to the inner end of the twelfth rectangular slot and the length of the twenty-third rectangular slot is less than the width of the twelfth rectangular slot. The lower end of the twenty-third rectangular slot is connected to the upper right end of the thirteenth magnetic gap (35). The right end of the twenty-third rectangular slot is on the same straight line as the right end of the thirteenth magnetic gap (35). Near the outer circle of the rotor lamination and between the eleventh rectangular slot and the fifth rectangular slot, there is a ninth rectangular slot that penetrates the thickness of the rotor lamination. The outer end of the ninth rectangular slot is connected to the outer circle of the rotor lamination, the outer end of the eleventh rectangular slot, and the fifth rectangular slot. The outer ends of the slots are not connected. An eleventh magnetic air gap (32) penetrating the thickness of the rotor lamination is provided at the inner end of the ninth rectangular slot. The left end of the eleventh magnetic air gap (32) is connected to the inner end of the ninth rectangular slot, and the width of the eleventh magnetic air gap (32) is smaller than the width of the ninth rectangular slot. The right end of the eleventh magnetic air gap (32) is to the left of the center line of the third N magnetic pole. The upper end of the eleventh magnetic air gap (32) is not connected to the lower end of the thirteenth magnetic air gap (35). The lower end of the eleventh magnetic air gap (32) is not connected to the upper end of the ninth magnetic air gap (31). A tenth rectangular slot penetrating the thickness of the rotor lamination is provided near the outer circle of the rotor lamination and between the twelfth rectangular slot and the sixth rectangular slot. The outer end of the tenth rectangular slot is connected to the outer circle of the rotor lamination, the outer end of the twelfth rectangular slot, and the sixth rectangular slot. The outer ends of the rectangular slots are not connected. A twelfth magnetic air gap (37) penetrating the thickness of the rotor lamination is provided at the inner end of the tenth rectangular slot. The right end of the twelfth magnetic air gap (37) is connected to the inner end of the tenth rectangular slot, and the width of the twelfth magnetic air gap (37) is less than the width of the tenth rectangular slot. The left end of the twelfth magnetic air gap (37) is to the right of the center line of the third N magnetic pole. The left end of the twelfth magnetic air gap (37) is not connected to the right end of the eleventh magnetic air gap (32). The upper end of the twelfth magnetic air gap (37) is not connected to the lower end of the thirteenth magnetic air gap (35). The lower end of the twelfth magnetic air gap (37) is not connected to the upper end of the tenth magnetic air gap (39). The lower end of the twelfth magnetic air gap (37) and the lower end of the eleventh magnetic air gap (32) are on the same straight line. A fourteenth magnetic air gap (20) is provided radially between the second rectangular slot and the third rectangular slot, on the center line of the first S magnetic pole and near the outer circle of the rotor lamination, penetrating the thickness of the rotor lamination. The outer end of the fourteenth magnetic air gap (20) is not connected to the outer circle of the rotor lamination. A second rectangular slot is provided near the outer circle of the rotor lamination and between the fourteenth magnetic air gap (20) and the second rectangular slot, penetrating the thickness of the rotor lamination. The outer end of the second rectangular slot is not connected to either the outer circle of the rotor lamination or the outer end of the second rectangular slot. A fifteenth magnetic air gap (19) penetrating the thickness of the rotor lamination is provided at the inner end of the slot. The left end of the fifteenth magnetic air gap (19) is connected to the inner end of the second rectangular slot, and the width of the fifteenth magnetic air gap (19) is smaller than the width of the second rectangular slot. The right end of the fifteenth magnetic air gap (19) is connected to the fourteenth magnetic air gap (20). A fourth rectangular slot penetrating the thickness of the rotor lamination is provided near the outer circle of the rotor lamination and between the fourteenth magnetic air gap (20) and the second rectangular slot. The outer end of the fourth rectangular slot is connected to the outer circle of the rotor lamination and the outer edge of the second rectangular slot. The end of the fourteenth magnetic air gap (20) is not connected to the outer end of the fourteenth magnetic air gap (20). The sixteenth magnetic air gap (18) is provided at the inner end of the fourth rectangular slot, penetrating the thickness of the rotor lamination. The left end of the sixteenth magnetic air gap (18) is connected to the inner end of the fourth rectangular slot and the width of the sixteenth magnetic air gap (18) is smaller than the width of the fourth rectangular slot. The right end of the sixteenth magnetic air gap (18) is connected to the fourteenth magnetic air gap (20). The lower end of the sixteenth magnetic air gap (18) is not connected to the upper end of the fifteenth magnetic air gap (19). Near the outer circle of the rotor lamination and at the... A third rectangular groove penetrating the thickness of the rotor lamination is provided between the fourteenth magnetic air gap (20) and the third rectangular groove. The outer end of the third rectangular groove is not connected to the outer circle of the rotor lamination, the outer end of the fourteenth magnetic air gap (20), or the outer end of the third rectangular groove. A twenty-fourth rectangular groove penetrating the thickness of the rotor lamination is provided at the inner end of the third rectangular groove. The upper end of the twenty-fourth rectangular groove is connected to the inner end of the third rectangular groove, and the width of the twenty-fourth rectangular groove is smaller than the width of the third rectangular groove. The lower end of the twenty-fourth rectangular groove is connected to the inner end of the fourteenth magnetic air gap (20). In the clockwise direction, at the position between the fourth rectangular slot and the fifth rectangular slot, on the center line of the second S magnetic pole and close to the outer circle of the rotor punching sheet, a second semicircular slot penetrating the thickness of the rotor punching sheet is provided. The inner arc surface of the second semicircular slot faces the outer circle of the rotor punching sheet, and the outer end of the second semicircular slot is not communicated with the outer circle of the rotor punching sheet. On the center line of the second S magnetic pole and directly below the second semicircular slot, a herringbone-shaped magnetic isolation air gap (45) penetrating the thickness of the rotor punching sheet is provided. The upper end of the herringbone-shaped magnetic isolation air gap (45) is not communicated with the lower end of the second semicircular slot. At the left lower end of the herringbone-shaped magnetic isolation air gap (45), an eighth rectangular slot penetrating the thickness of the rotor punching sheet is provided. The upper end of the eighth rectangular slot is communicated with the left lower end of the herringbone-shaped magnetic isolation air gap (45), and the width of the eighth rectangular slot is greater than the width of the left lower end of the herringbone-shaped magnetic isolation air gap (45). Between the lower end of the eighth rectangular slot and the fourth rectangular slot, a seventeenth magnetic isolation air gap (43) penetrating the thickness of the rotor punching sheet is provided. The inner end of the seventeenth magnetic isolation air gap (43) is communicated with the lower end of the eighth rectangular slot, and the width of the seventeenth magnetic isolation air gap (43) is smaller than the width of the eighth rectangular slot. The outer end of the seventeenth magnetic isolation air gap (43) extends outward to the outer circle of the rotor punching sheet, and is not communicated with the outer circle of the rotor punching sheet, the left end of the second semicircular slot, and the outer end of the fourth rectangular slot. At the right lower end of the herringbone-shaped magnetic isolation air gap (45), a seventh rectangular slot penetrating the thickness of the rotor punching sheet is provided. The upper end of the seventh rectangular slot is communicated with the right lower end of the herringbone-shaped magnetic isolation air gap (45), and the width of the seventh rectangular slot is greater than the width of the right lower end of the herringbone-shaped magnetic isolation air gap (45). Between the lower end of the seventh rectangular slot and the fifth rectangular slot, an eighteenth magnetic isolation air gap (48) penetrating the thickness of the rotor punching sheet is provided. The inner end of the eighteenth magnetic isolation air gap (48) is communicated with the lower end of the seventh rectangular slot, and the width of the eighteenth magnetic isolation air gap (48) is smaller than the width of the seventh rectangular slot. The outer end of the eighteenth magnetic isolation air gap (48) extends outward to the outer circle of the rotor punching sheet, and is not communicated with the outer circle of the rotor punching sheet, the right end of the second semicircular slot, and the outer end of the fifth rectangular slot; Along the clockwise direction, between the sixth rectangular slot and the first rectangular slot, on the center line of the third S magnetic pole and near the outer circle of the rotor lamination, there is a nineteenth magnetic air gap (41) that penetrates the thickness of the rotor lamination in the radial direction. The outer end of the nineteenth magnetic air gap (41) is not connected to the outer circle of the rotor lamination. Near the outer circle of the rotor lamination and between the nineteenth magnetic air gap (41) and the sixth rectangular slot, there is a thirteenth rectangular slot that penetrates the thickness of the rotor lamination. The outer end of the thirteenth rectangular slot is not connected to the outer circle of the rotor lamination, the outer end of the sixth rectangular slot, or the outer end of the nineteenth magnetic air gap (41). The inner end of the thirteenth rectangular slot has a section that penetrates the thickness of the rotor lamination. The 25th rectangular slot has its upper end connected to the inner end of the 13th rectangular slot and its width is smaller than that of the 13th rectangular slot. The lower end of the 25th rectangular slot is connected to the inner end of the 19th magnetic gap (41). Near the outer circle of the rotor lamination and between the 19th magnetic gap (41) and the first rectangular slot, there is a 14th rectangular slot that penetrates the thickness of the rotor lamination. The center line of the length direction of the 14th rectangular slot is parallel to the center line of the third S magnetic pole. The outer end of the 14th rectangular slot is not connected to the outer circle of the rotor lamination or the outer end of the first rectangular slot. The inner end of the 14th rectangular slot has a 26th rectangular slot that penetrates the thickness of the rotor lamination. The upper end of the twenty-sixth rectangular slot is connected to the inner end of the fourteenth rectangular slot, and the length of the twenty-sixth rectangular slot is less than the width of the fourteenth rectangular slot. A twentieth magnetic air gap (42) penetrating the thickness of the rotor lamination is provided at the lower end of the twenty-sixth rectangular slot. The upper end of the twentieth magnetic air gap (42) is connected to the lower end of the twenty-sixth rectangular slot, and the length of the twentieth magnetic air gap (42) is greater than the length of the twenty-sixth rectangular slot. The right end of the twentieth magnetic air gap (42) is on the same straight line as the right end of the twenty-sixth rectangular slot. A twenty-seventh rectangular slot penetrating the thickness of the rotor lamination is provided at the left end of the twentieth magnetic air gap (42). The right end of the twenty-seventh rectangular slot is connected to the inner end of the fourteenth rectangular slot. The left end of the magnetic air gap (42) is connected, the lower end of the twenty-seventh rectangular slot is on the same straight line as the lower end of the twentieth magnetic air gap (42), the fifteenth rectangular slot is provided at the left end of the twenty-seventh rectangular slot, the right end of the fifteenth rectangular slot is connected to the left end of the twenty-seventh rectangular slot and the length of the twenty-seventh rectangular slot is less than the width of the fifteenth rectangular slot, the twenty-eighth rectangular slot is provided at the left end of the fifteenth rectangular slot, the right end of the twenty-eighth rectangular slot is connected to the left end of the fifteenth rectangular slot and the length of the twenty-eighth rectangular slot is less than the width of the fifteenth rectangular slot, and the left end of the twenty-eighth rectangular slot is connected to the nineteenth magnetic air gap (41); The rotor laminations are stacked and welded with the burrs facing in one direction to form the rotor core (3). The first rectangular ferrite permanent magnet (11) is installed in the first rectangular slot with the right end face polarity as N. The second rectangular ferrite permanent magnet (15) is installed in the second rectangular slot with the left end face polarity as N. The first semi-circular neodymium iron boron permanent magnet (4) is installed in the first semi-circular slot with the inner arc surface polarity as N. Two identical first rectangular neodymium iron boron permanent magnets (13) are installed in two first rectangular slots with a "V" shaped structure with the back polarity of their opposite sides as N, forming the first N pole of the permanent magnet rotor. The second rectangular neodymium iron boron permanent magnet (16) is installed in the slot with the right end face polarity as N. The first S pole of the permanent magnet rotor is formed by installing the third rectangular NdFeB permanent magnet (21) with its left end face as the S pole in the second rectangular slot, and the fourth rectangular NdFeB permanent magnet (17) with its right end face as the S pole in the fourth rectangular slot. The third rectangular ferrite permanent magnet (22) with its right end face as the N pole in the third rectangular slot, and the fourth rectangular ferrite permanent magnet (28) with its left end face as the N pole in the fourth rectangular slot, and two identical fifth rectangular NdFeB permanent magnets (24) with their opposite sides as the N pole in the two fifth rectangular slots forming an inverted "V" shape. The sixth rectangular NdFeB permanent magnet is then installed in the second rectangular slot. Neodymium iron boron permanent magnet (26) is installed in the sixth rectangular slot with the upper end face polarity as N pole, forming the second N pole of the permanent magnet rotor. The second semi-circular neodymium iron boron permanent magnet (46) is installed in the second semi-circular slot with the inner arc surface polarity as S pole. The seventh rectangular neodymium iron boron permanent magnet (47) is installed in the seventh rectangular slot with the upper end face polarity as S pole. The eighth rectangular neodymium iron boron permanent magnet (44) is installed in the eighth rectangular slot with the upper end face polarity as S pole, forming the second S pole of the permanent magnet rotor. The fifth rectangular ferrite permanent magnet (30) is installed in the fifth rectangular slot with the right end face polarity as N pole. The sixth rectangular ferrite permanent magnet (40) is installed in the sixth rectangular slot with the left end face polarity as N pole. In the rectangular slot, the ninth rectangular NdFeB permanent magnet (33) is installed with the right end face polarity as N pole; the tenth rectangular NdFeB permanent magnet (38) is installed with the left end face polarity as N pole; the eleventh rectangular NdFeB permanent magnet (34) is installed with the right end face polarity as N pole; the twelfth rectangular NdFeB permanent magnet (36) is installed with the left end face polarity as N pole, forming the third N pole of the permanent magnet rotor; the thirteenth rectangular NdFeB permanent magnet (6) is installed with the right end face polarity as S pole; and the fourteenth rectangular NdFeB permanent magnet (8) is installed with the left end face polarity as S pole.The fifteenth rectangular neodymium iron boron permanent magnet (7) is installed in the fifteenth rectangular slot with the upper end face polarity as S pole, forming the third S pole of the permanent magnet rotor. This process is repeated to form a composite excitation and focusing permanent magnet rotor with N poles and S poles arranged alternately, consisting of ferrite permanent magnet and neodymium iron boron permanent magnet.

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