Neodymium-iron-boron permanent magnet and ferrite permanent magnet collaborative excitation motor

Abstract

The invention provides a neodymium-iron-boron permanent magnet and ferrite permanent magnet collaborative excitation motor, and belongs to the technical field of automobile motor electric appliances, N magnetic poles and S magnetic poles on a permanent magnet rotor are not symmetrical, each magnetic pole magnetic field is composed of a plurality of sub magnetic fields, the cogging torque is small, the torque pulsation is low, each magnetic pole is composed of a plurality of pieces of permanent magnet steel and a magnetic isolation air gap, the magnetic gathering effect is remarkable, and the permanent magnet effect is good. The magnetic field intensity is large, the power density is high, the magnetic isolation air gaps on the magnetic poles change the magnetic path trend, the air gap flux density waveform tends to be sinusoidal, the output torque is increased, the output efficiency is improved, the motor rotor is a combined magnetic pole permanent magnet rotor of neodymium iron boron permanent magnet and ferrite permanent magnet collaborative excitation, the use number of rare earth neodymium iron boron permanent magnet steel is reduced, and the cost is reduced.

Description

Technical Field

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

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

[0003] The purpose of this invention is to provide a neodymium iron boron (NdFeB) permanent magnet and ferrite permanent magnet combined pole rotor that overcomes the above-mentioned defects, saves the amount of rare earth permanent magnet materials used, reduces costs, and provides the magnetic field of each pole with multiple permanent magnet steels, 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 of this invention is as follows: The neodymium iron boron permanent magnet and ferrite permanent magnet synergistic excitation motor is composed of a front cover, a rear cover, a housing, a rotor, and a stator. Its characteristic is that the motor rotor is a combined magnetic pole permanent magnet rotor with neodymium iron boron permanent magnet and ferrite permanent magnet synergistic excitation. The combined permanent magnet rotor with neodymium iron boron (NdFeB) and ferrite permanent magnets for synergistic excitation includes a shaft, a rotor core, and nine rectangular ferrite permanent magnets: a first rectangular ferrite permanent magnet, a second rectangular ferrite permanent magnet, a third rectangular ferrite permanent magnet, a fourth rectangular ferrite permanent magnet, a fifth rectangular ferrite permanent magnet, a sixth rectangular ferrite permanent magnet, a seventh rectangular NdFeB permanent magnet, an eighth rectangular NdFeB permanent magnet, and a ninth rectangular NdFeB permanent magnet. 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, thirteenth rectangular neodymium iron boron permanent magnet steel, fourteenth rectangular neodymium iron boron permanent magnet steel, fifteenth rectangular neodymium iron boron permanent magnet steel, semi-circular neodymium iron boron permanent magnet steel, first magnetic isolation air gap, second magnetic isolation air gap, third magnetic isolation air gap, fourth magnetic isolation air gap, fifth magnetic isolation air gap, sixth magnetic isolation air gap, seventh magnetic isolation air gap, eighth magnetic isolation air gap, ninth magnetic isolation air gap, tenth magnetic isolation air gap, eleventh magnetic isolation air gap, twelfth magnetic isolation air gap, thirteenth magnetic isolation air gap, fourteenth magnetic isolation air gap, tenth The fifth, sixteenth, and seventeenth magnetic air gaps each have a first rectangular slot penetrating the thickness of the rotor lamination, located near the outer circumference 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 forming an angle of 11.25° with the center line of the first N magnetic pole. The outer end of the first rectangular slot has a first arc-shaped magnetic air gap penetrating the thickness of the rotor lamination. The outer end of the first arc-shaped magnetic air gap is not connected to the outer circumference of the rotor lamination, while the inner end of the first arc-shaped magnetic air gap is connected to the outer end of the first rectangular slot, forming a circle whose diameter is larger than the width of the first rectangular slot. The inner end of the rectangular slot is provided with a first magnetic isolation air gap that penetrates the thickness of the rotor lamination. The outer end of the first magnetic isolation air gap is connected to the inner end of the first rectangular slot. Between the inner end of the first magnetic isolation air gap and the center line of the first N magnetic pole, there is a second rectangular slot with a tangential structure that penetrates the thickness of the rotor lamination. The right end of the second rectangular slot is to the left of the center line of the first N magnetic pole, and the left end of the second rectangular slot is connected to the inner end of the first magnetic isolation air gap. The width of the first magnetic isolation air gap is smaller than the width of the first rectangular slot and the width of the second rectangular slot. It is located near the outer circle of the rotor lamination, to the right of the center line of the first N magnetic pole, and at an angle of 11° with the center line of the first N magnetic pole.A third rectangular slot penetrating the thickness of the rotor lamination is provided to the left of the 25° center line. A second arc-shaped magnetic isolation air gap penetrating the thickness of the rotor lamination is provided at the outer end of the third rectangular slot. 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 third rectangular slot, and the diameter of the circle forming the second arc-shaped magnetic isolation air gap is larger than the width of the third rectangular slot. A second magnetic isolation air gap penetrating the thickness of the rotor lamination is provided at the inner end of the third rectangular slot. The outer end of the second magnetic isolation air gap is connected to the inner end of the third rectangular slot. A fourth rectangular slot with a tangential structure penetrating the thickness of the rotor lamination is provided between the inner end of the second magnetic isolation air gap and the center line of the first N magnetic pole. The left end of the fourth rectangular slot is located at the center line of the first N magnetic pole. On the right side, the left end of the fourth rectangular slot is not connected to the right end of the second rectangular slot, while the right end of the fourth rectangular slot is connected to the inner end of the second magnetic isolation air gap. The width of the second magnetic isolation air gap is smaller than the width of both the third and fourth rectangular slots. The lower end of the fourth rectangular slot is on the same straight line as the lower end of the second rectangular slot. Near the outer circle of the rotor lamination and along the center line of the first N magnetic pole, a third magnetic isolation air gap penetrating the thickness of the rotor lamination is provided. The outer end of the third magnetic isolation air gap is not connected to the outer circle of the rotor lamination, and the inner end of the third magnetic isolation air gap is not connected to the upper ends of either the second or fourth rectangular slots. Near the outer circle of the rotor lamination and between the third magnetic isolation air gap and the first rectangular slot, a fifth rectangular slot penetrating the thickness of the rotor lamination is provided. The centerline along the length of the slot is parallel to the first N magnetic pole line. The outer end of the fifth rectangular slot is not connected to the outer circle of the rotor lamination. The inner end of the fifth rectangular slot is provided with 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 fifth rectangular slot. The length of the twenty-second rectangular slot is less than the width of the fifth rectangular slot. The lower end of the twenty-second rectangular slot is provided with a fourth magnetic isolation gap that penetrates the thickness of the rotor lamination. The length of the fourth magnetic isolation gap is greater than the length of the twenty-second rectangular slot. The left end of the fourth magnetic isolation gap is on the same straight line as the left end of the twenty-second rectangular slot. Between the fourth magnetic isolation gap and the third magnetic isolation gap, there is a sixth rectangular slot with a tangential structure that penetrates the thickness of the rotor lamination. The left end of the sixth rectangular slot is connected to the fourth magnetic isolation gap. The right end of the sixth rectangular slot is connected to the third magnetic gap, and the width of the sixth rectangular slot is greater than the width of the fourth magnetic gap. A twenty-third rectangular slot, penetrating the thickness of the rotor lamination, is provided at the right end of the sixth rectangular slot. The left end of the twenty-third rectangular slot is connected to the right end of the sixth rectangular slot, and the length of the twenty-third rectangular slot is less than the width of the sixth rectangular slot. The right end of the twenty-third rectangular slot is connected to the third magnetic gap. Near the outer circle of the rotor lamination and between the third magnetic gap and the third rectangular slot, a seventh rectangular slot, penetrating the thickness of the rotor lamination, is provided. The outer end of the seventh rectangular slot is not connected to the outer circle of the rotor lamination, the outer end of the third rectangular slot, or the outer end of the third magnetic gap. The inner end of the seventh rectangular slot is connected to the inner end of the third magnetic gap, and the width of the third magnetic gap is less than the width of the seventh rectangular slot. Along a clockwise direction, near the outer circumference of the rotor lamination, to the left of the center line of the first S magnetic pole and to the right of the center line at an angle of 11.25° to the center line of the first S magnetic pole, an eighth rectangular slot penetrating the thickness of the rotor lamination is provided. The outer end of the eighth rectangular slot is not connected to the outer circumference of the rotor lamination. The inner end of the eighth rectangular slot is provided with a fifth magnetic isolation gap penetrating the thickness of the rotor lamination. The outer end of the fifth magnetic isolation gap is connected to the inner end of the eighth rectangular slot, and the width of the fifth magnetic isolation gap is smaller than the width of the eighth rectangular slot. The inner end of the fifth magnetic isolation gap extends to the left of the center line of the first S magnetic pole and is not connected to the inner circumference of the rotor lamination. A ninth rectangular slot, penetrating the thickness of the rotor lamination, is provided to the right of the center line of the first S magnetic pole and to the left of the center line at an angle of 11.25° to the center line of the first S magnetic pole. The outer end of the ninth rectangular slot is not connected to the outer circle of the rotor lamination. A sixth magnetic isolation air gap, penetrating the thickness of the rotor lamination, is provided at the inner end of the ninth rectangular slot. The outer end of the sixth magnetic isolation air gap is connected to the inner end of the ninth rectangular slot, and the width of the sixth magnetic isolation air gap is smaller than the width of the ninth rectangular slot. The inner end of the sixth magnetic isolation air gap extends to the right of the center line of the first S magnetic pole and is not connected to the inner circle of the rotor lamination. The inner end of the sixth magnetic isolation air gap is not connected to the inner end of the fifth magnetic isolation air gap. The lowest point of the inner end is aligned with the lowest point of the inner end of the fifth magnetic isolation air gap. Near the outer circumference of the rotor lamination and on the center line of the first S magnetic pole, a seventh magnetic isolation air gap penetrating the thickness of the rotor lamination is provided. The outer end of the seventh magnetic isolation air gap is not connected to the outer circumference of the rotor lamination. Between the seventh magnetic isolation air gap and the eighth rectangular slot, a tenth rectangular slot penetrating the thickness of the rotor lamination is provided. The outer end of the tenth rectangular slot is not connected to the outer circumference of the rotor lamination, the outer end of the eighth rectangular slot, or the outer end of the seventh magnetic isolation air gap. The inner end of the tenth rectangular slot is connected to the inner end of the seventh magnetic isolation air gap, and the width of the seventh magnetic isolation air gap is smaller than the width of the tenth rectangular slot. The inner end of the air gap is not connected to the inner end of the fifth magnetic isolation air gap or the inner end of the sixth magnetic isolation air gap. Near the outer circle of the rotor lamination and between the seventh magnetic isolation air gap and the ninth rectangular slot, there are two eleventh rectangular slots with a "V" shaped structure that penetrate the thickness of the rotor lamination. The inner ends of the two eleventh rectangular slots with a "V" shaped structure are not connected. The outer end of the eleventh rectangular slot on the left of the two eleventh rectangular slots with a "V" shaped structure is not connected to the outer circle of the rotor lamination or the outer end of the seventh magnetic isolation air gap. The outer end of the eleventh rectangular slot on the right of the two eleventh rectangular slots with a "V" shaped structure is not connected to the outer circle of the rotor lamination or the outer end of the ninth rectangular slot. A twelfth rectangular slot, penetrating the thickness of the rotor lamination, is located near the outer circle 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 11.25° to the center line of the second N magnetic pole. A third arc-shaped magnetic air gap, penetrating the thickness of the rotor lamination, is located at the outer end of the twelfth rectangular slot. The outer end of the third arc-shaped magnetic air gap is not connected to the outer circle of the rotor lamination. The inner end of the third arc-shaped magnetic air gap is connected to the outer end of the twelfth rectangular slot, and the diameter of the circle forming the third arc-shaped magnetic air gap is larger than the width of the twelfth rectangular slot. An eighth magnetic air gap, tangentially oriented, is located between the inner end of the twelfth rectangular slot and the center line of the second N magnetic pole. The left end of the eighth magnetic air gap is connected to the inner end of the twelfth rectangular slot, and the width of the eighth magnetic air gap is smaller than the width of the twelfth rectangular slot. The right end of the eighth magnetic air gap is located to the left of the center line of the second N magnetic pole, near the outer circle of the rotor lamination, to the right of the center line of the second N magnetic pole, and at an angle of 11° to the center line of the second N magnetic pole.A thirteenth rectangular slot, penetrating the thickness of the rotor lamination, is located to the left of the 25° centerline. A fourth arc-shaped magnetic isolation air gap, also penetrating the thickness of the rotor lamination, is located at the outer end of the thirteenth rectangular slot. The outer end of the fourth arc-shaped magnetic isolation air gap is not connected to the outer circle of the rotor lamination, while the inner end of the fourth arc-shaped magnetic isolation air gap is connected to the outer end of the thirteenth rectangular slot, forming a circle whose diameter is larger than the width of the thirteenth rectangular slot. A ninth magnetic isolation air gap, tangentially oriented, is located between the inner end of the thirteenth rectangular slot and the centerline of the second N magnetic pole. The ninth magnetic isolation air gap is located to the right of… The end of the ninth magnetic gap is connected to the inner end of the thirteenth rectangular slot, and the width of the ninth magnetic gap is smaller than the width of the thirteenth rectangular slot. The left end of the ninth magnetic gap is to the right of the center line of the second N magnetic pole. The left end of the ninth magnetic gap is not connected to the right end of the eighth magnetic gap. The lower end of the ninth magnetic gap is on the same straight line as the lower end of the eighth magnetic gap. Near the outer circle of the rotor lamination and on the center line of the second N magnetic pole, there is a tenth magnetic gap that penetrates the thickness of the rotor lamination. The outer end of the tenth magnetic gap is not connected to the outer circle of the rotor lamination. Near the outer circle of the rotor lamination and on the tenth magnetic gap, there is a tenth magnetic gap that penetrates the thickness of the rotor lamination. A twenty-first rectangular slot, penetrating the thickness of the rotor lamination, is provided between the second rectangular slot and the tenth magnetic isolation air gap. The centerline of the twenty-first rectangular slot along its length is parallel to the centerline of the second N magnetic pole. The outer end of the twenty-first rectangular slot is not connected to the outer circle of the rotor lamination, the outer end of the twelfth rectangular slot, or the outer end of the tenth magnetic isolation air gap. A seventeenth magnetic isolation air gap, penetrating the thickness of the rotor lamination and tangentially structured, is provided between the inner end of the twenty-first rectangular slot and the tenth magnetic isolation air gap. The left end of the seventeenth magnetic isolation air gap is connected to the inner end of the twenty-first rectangular slot. The width of the seventeenth magnetic isolation air gap is... The width is less than that of the twenty-first rectangular slot. The right end of the seventeenth magnetic air gap is connected to the inner end of the tenth magnetic air gap. Near the outer circle of the rotor lamination and between the tenth magnetic air gap and the thirteenth rectangular slot, there is a semi-circular slot that penetrates the thickness of the rotor lamination. The inner arc surface of the semi-circular slot faces the outer circle of the rotor lamination. The outer end of the semi-circular slot is not connected to the outer circle of the rotor lamination. The inner end of the semi-circular slot is not connected to the upper end of the ninth magnetic air gap. The left end of the semi-circular slot is not connected to the outer end of the tenth magnetic air gap. The right end of the semi-circular slot is not connected to the outer end of the thirteenth rectangular slot. Along a clockwise direction, near the outer circumference of the rotor lamination, to the left of the center line of the second S magnetic pole and to the right of the center line at an angle of 11.25° to the center line of the second S magnetic pole, an eleventh magnetic isolation gap penetrating the thickness of the rotor lamination is provided. The outer end of the eleventh magnetic isolation gap is not connected to the outer circumference of the rotor lamination. The inner end of the eleventh magnetic isolation gap is provided, penetrating the thickness of the rotor lamination, with a fourteenth rectangular groove. The width of the fourteenth rectangular groove is greater than the width of the eleventh magnetic isolation gap. The inner end of the fourteenth rectangular groove extends inward to the left of the center line of the second S magnetic pole, and is not connected to the inner circumference of the rotor lamination. Near the outer circumference of the rotor lamination, to the right of the center line of the second S magnetic pole and to the left of the center line at an angle of 11.25° to the center line of the second S magnetic pole, a tenth magnetic isolation gap penetrating the thickness of the rotor lamination is provided. The twelfth magnetic gap has two magnetic gaps. The outer end of the twelfth magnetic gap is not connected to the outer circle of the rotor lamination. The inner end of the twelfth magnetic gap has a fifteenth rectangular slot that penetrates the thickness of the rotor lamination. The width of the fifteenth rectangular slot is greater than the width of the twelfth magnetic gap. The inner end of the fifteenth rectangular slot extends inward to the right side of the center line of the second S-pole. The inner end of the fifteenth rectangular slot is not connected to the inner circle of the rotor lamination. The inner end of the fifteenth rectangular slot is not connected to the inner end of the fourteenth rectangular slot. The lowest point of the inner end of the fifteenth rectangular slot is on the same straight line as the lowest point of the inner end of the fourteenth rectangular slot. Near the outer circle of the rotor lamination, a sixteenth rectangular slot with a tangential structure penetrates the thickness of the rotor lamination, and the center line of the sixteenth rectangular slot along its length is perpendicular to the center line of the second S-pole. The left end of the sixteenth rectangular slot… A twenty-fourth rectangular slot is provided, penetrating the thickness of the rotor lamination. The right end of the twenty-fourth rectangular slot connects to the left end of the sixteenth rectangular slot, and the length of the twenty-fourth rectangular slot is less than the width of the sixteenth rectangular slot. A thirteenth magnetic air gap, penetrating the thickness of the rotor lamination, is provided at the left end of the twenty-fourth rectangular slot. The left end of the twenty-fourth rectangular slot connects to the right end of the thirteenth magnetic air gap, and the length of the twenty-fourth rectangular slot is equal to the width of the thirteenth magnetic air gap. A twenty-fifth rectangular slot, penetrating the thickness of the rotor lamination, is provided at the upper end of the thirteenth magnetic air gap. The inner end of the twenty-fifth rectangular slot connects to the upper end of the thirteenth magnetic air gap, and the length of the twenty-fifth rectangular slot is equal to the length of the thirteenth magnetic air gap. The left end of the twenty-fifth rectangular slot and the left end of the thirteenth magnetic air gap are on the same straight line. A seventeenth rectangular slot, penetrating the thickness of the rotor lamination and parallel to the center line of the second S magnetic pole, is provided at the upper end of the rectangular slot. The outer end of the seventeenth rectangular slot is not connected to the outer circle of the rotor lamination. The inner end of the seventeenth rectangular slot is connected to the upper end of the twenty-fourth rectangular slot, and the width of the seventeenth rectangular slot is greater than the length of the twenty-fourth rectangular slot. A twenty-sixth rectangular slot, penetrating the thickness of the rotor lamination, is provided at the right end of the sixteenth rectangular slot. The left end of the twenty-sixth rectangular slot is connected to the right end of the sixteenth rectangular slot, and the length of the twenty-sixth rectangular slot is less than the width of the sixteenth rectangular slot. A fourteenth magnetic air gap, penetrating the thickness of the rotor lamination, is provided at the right end of the twenty-sixth rectangular slot. The right end of the twenty-sixth rectangular slot is connected to the left end of the fourteenth magnetic air gap, and the length of the twenty-sixth rectangular slot is equal to the width of the fourteenth magnetic air gap.A twenty-seventh rectangular slot, penetrating the thickness of the rotor lamination, is provided at the upper end of the fourteenth magnetic isolation air gap. The inner end of the twenty-seventh rectangular slot is connected to the upper end of the fourteenth magnetic isolation air gap, and the length of the twenty-seventh rectangular slot is equal to the length of the fourteenth magnetic isolation air gap. The right end of the twenty-seventh rectangular slot is on the same straight line as the right end of the fourteenth magnetic isolation air gap. An eighteenth rectangular slot, penetrating the thickness of the rotor lamination and parallel to the center line of the second S magnetic pole, is provided at the upper end of the twenty-seventh rectangular slot. The outer end of the eighteenth rectangular slot is not connected to the outer circle of the rotor lamination, and the inner end of the eighteenth rectangular slot is connected to the upper end of the twenty-seventh rectangular slot. The width of the eighteenth rectangular slot is greater than the length of the twenty-seventh rectangular slot. A nineteenth rectangular slot, penetrating the thickness of the rotor lamination, is provided near the outer circle of the rotor lamination and between the eleventh magnetic isolation air gap and the seventeenth rectangular slot. The outer end of the nineteenth rectangular slot is not connected to the outer circle of the rotor lamination, the outer end of the eleventh magnetic isolation air gap, or the outer end of the seventeenth rectangular slot. The inner end of the nineteenth rectangular slot is provided with a penetrating... A fifteenth magnetic air gap, the thickness of which is the same as the lamination, is formed. The outer end of the fifteenth magnetic air gap is connected to the inner end of the nineteenth rectangular slot, and the width of the fifteenth magnetic air gap is smaller than the width of the nineteenth rectangular slot. The inner end of the fifteenth magnetic air gap extends inward to the left side of the center line of the second S magnetic pole. Near the outer circle of the rotor lamination, between the twelfth magnetic air gap and the eighteenth rectangular slot, a sixteenth magnetic air gap is formed, penetrating the thickness of the rotor lamination. The outer end of the sixteenth magnetic air gap is not connected to the outer circle of the rotor lamination, the outer end of the twelfth magnetic air gap, or the outer end of the eighteenth rectangular slot. Between the inner end of the sixteenth magnetic air gap and the center line of the second S magnetic pole, a twentieth rectangular slot, tangentially penetrating the thickness of the rotor lamination, is formed. The right end of the twentieth rectangular slot is connected to the inner end of the sixteenth magnetic air gap, and the width of the twentieth rectangular slot is greater than the width of the sixteenth magnetic air gap. The left end of the twentieth rectangular slot is not connected to the inner end of the fifteenth magnetic air gap. The lower end of the twentieth rectangular slot is on the same straight line as the lowest end of the inner end of the fifteenth magnetic air gap. The rotor laminations are stacked and welded with the burrs facing in one direction to form the rotor core. A first rectangular ferrite permanent magnet is installed in a first rectangular slot with its right side polarity as the N pole. A second rectangular ferrite permanent magnet is installed in a tangentially oriented second rectangular slot with its top side polarity as the N pole. A third rectangular ferrite permanent magnet is installed in a third rectangular slot with its left side polarity as the N pole. A fourth rectangular ferrite permanent magnet is installed in a tangentially oriented fourth rectangular slot with its top side polarity as the N pole. A first rectangular NdFeB permanent magnet is installed with its right side polarity as the N pole. The first rectangular NdFeB permanent magnet is installed in the fifth rectangular slot. The second rectangular NdFeB permanent magnet is installed in the sixth rectangular slot with its upper side polarity as the N pole. The third rectangular NdFeB permanent magnet is installed in the seventh rectangular slot with its left side polarity as the N pole, forming the first N pole of the permanent magnet rotor. The fourth rectangular NdFeB permanent magnet is installed in the eighth rectangular slot with its right side polarity as the S pole. The fifth rectangular NdFeB permanent magnet is installed in the ninth rectangular slot with its left side polarity as the S pole. The sixth rectangular NdFeB permanent magnet is installed in the tenth rectangular slot with its right side polarity as the S pole. The two completely parallel NdFeB permanent magnets are then installed in the tenth rectangular slot. The eleventh rectangular NdFeB permanent magnet is installed in two V-shaped rectangular slots with opposite sides having S poles, forming the first S pole of the permanent magnet rotor. The fifth rectangular ferrite permanent magnet is installed in the twelfth rectangular slot with its right side having N pole. The sixth rectangular ferrite permanent magnet is installed in the thirteenth rectangular slot with its left side having N pole. The eighth rectangular NdFeB permanent magnet is installed in the twenty-first rectangular slot with its right side having N pole. The semi-circular NdFeB permanent magnet is installed in the semi-circular slot with its inner arc surface having N pole. To form the second N pole of the permanent magnet rotor, the ninth rectangular NdFeB permanent magnet is installed in the fourteenth rectangular slot with its right side polarity as the S pole. The tenth rectangular NdFeB permanent magnet is installed in the fifteenth rectangular slot with its left side polarity as the S pole. The eleventh rectangular NdFeB permanent magnet is installed in the sixteenth rectangular slot with its upper side polarity as the S pole. The twelfth rectangular NdFeB permanent magnet is installed in the seventeenth rectangular slot with its right side polarity as the S pole. The thirteenth rectangular NdFeB permanent magnet is installed in the eighteenth rectangular slot with its left side polarity as the S pole.The fourteenth rectangular NdFeB permanent magnet is installed in the nineteenth rectangular slot with its right side polarity as the S pole. The fifteenth rectangular NdFeB permanent magnet is installed in the twentieth rectangular slot with its upper side polarity as the S pole, forming the second S pole of the permanent magnet rotor. This process is repeated to form a combined permanent magnet rotor with NdFeB and ferrite permanent magnets working together, featuring alternating N and S poles.

[0004] Compared with existing technologies, the N and S magnetic poles on the permanent magnet rotor of this invention are asymmetrical, and the magnetic field of each magnetic pole is composed of multiple sub-magnetic fields. The cogging torque is small and the torque pulsation is low. Each magnetic pole is composed of multiple permanent magnet steels and magnetic isolation air gaps, resulting in significant magnetic focusing effect, high magnetic field strength, and high power density. The magnetic isolation air gaps on the magnetic poles change the magnetic circuit direction, and the air gap magnetic flux density waveform is more sinusoidal, increasing the output torque and improving the output efficiency. The motor rotor is a combined permanent magnet rotor with neodymium iron boron permanent magnets and ferrite permanent magnets for synergistic excitation, which reduces the amount of rare earth neodymium iron boron permanent magnet steel used and lowers the cost. Attached Figure Description

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

[0006] In the diagram: 1. Rear end cover; 2. Shaft; 3. Rotor core; 4. Stator core; 5. Housing; 6. First rectangular ferrite permanent magnet; 7. Third rectangular NdFeB permanent magnet; 8. Fourth rectangular NdFeB permanent magnet; 9. Second rectangular ferrite permanent magnet; 10. Front end cover; 11. Semi-circular NdFeB permanent magnet; 12. Ninth rectangular NdFeB permanent magnet; 13. Fifteenth rectangular NdFeB permanent magnet; 14. Eleventh rectangular NdFeB permanent magnet; 15. Twelfth rectangular NdFeB permanent magnet; 16. Third rectangular ferrite permanent magnet; 17. Fourth rectangular ferrite permanent magnet; 18. First rectangular NdFeB permanent magnet; 19. Second rectangular NdFeB permanent magnet; 20. Fifth rectangular NdFeB permanent magnet; 21. Sixth rectangular NdFeB permanent magnet; 22. Seventh rectangular NdFeB permanent magnet. 23. Fifth rectangular ferrite permanent magnet steel; 24. Sixth rectangular ferrite permanent magnet steel; 25. Eighth rectangular NdFeB permanent magnet steel; 26. Tenth rectangular NdFeB permanent magnet steel; 27. Thirteenth rectangular NdFeB permanent magnet steel; 28. Fourteenth rectangular NdFeB permanent magnet steel; 29. ​​First magnetic isolation air gap; 30. Second magnetic isolation air gap; 31. Third magnetic isolation air gap; 32. Fourth magnetic isolation air gap; 33. Fifth magnetic isolation air gap; 34. Sixth magnetic isolation air gap; 35. Seventh magnetic isolation air gap; 36. Eighth magnetic isolation air gap; 37. Ninth magnetic isolation air gap; 38. Tenth magnetic isolation air gap; 39. Eleventh magnetic isolation air gap; 40. Twelfth magnetic isolation air gap; 41. Thirteenth magnetic isolation air gap; 42. Fourteenth magnetic isolation air gap; 43. Fifteenth magnetic isolation air gap; 44. Sixteenth magnetic isolation air gap; 45. Seventeenth magnetic isolation air gap. Detailed Implementation

[0007] The present invention will be further described below with reference to the accompanying drawings: The neodymium iron boron permanent magnet and ferrite permanent magnet synergistic excitation motor is composed of a front cover 10, a rear cover 1, a housing 5, a rotor, and a stator. Its characteristic is that the motor rotor is a combined magnetic pole permanent magnet rotor of neodymium iron boron permanent magnet and ferrite permanent magnet synergistic excitation. The combined permanent magnet rotor with neodymium iron boron (NdFeB) permanent magnets and ferrite permanent magnets for synergistic excitation includes a shaft 2, a rotor core 3, a first rectangular ferrite permanent magnet 6, a second rectangular ferrite permanent magnet 9, a third rectangular ferrite permanent magnet 16, a fourth rectangular ferrite permanent magnet 17, a fifth rectangular ferrite permanent magnet 23, a sixth rectangular ferrite permanent magnet 24, a first rectangular NdFeB permanent magnet 18, a second rectangular NdFeB permanent magnet 19, a third rectangular NdFeB permanent magnet 7, a fourth rectangular NdFeB permanent magnet 8, a fifth rectangular NdFeB permanent magnet 20, a sixth rectangular NdFeB permanent magnet 21, a seventh rectangular NdFeB permanent magnet 22, and an eighth rectangular NdFeB permanent magnet 25. 12. Ninth rectangular NdFeB permanent magnet steel; 26. Tenth rectangular NdFeB permanent magnet steel; 14. Eleventh rectangular NdFeB permanent magnet steel; 15. Twelfth rectangular NdFeB permanent magnet steel; 27. Thirteenth rectangular NdFeB permanent magnet steel; 28. Fourteenth rectangular NdFeB permanent magnet steel; 13. Fifteenth rectangular NdFeB permanent magnet steel; 11. Semi-circular NdFeB permanent magnet steel; 29. ​​First magnetic isolation air gap; 30. Second magnetic isolation air gap; 31. Third magnetic isolation air gap; 32. Fourth magnetic isolation air gap; 33. Fifth magnetic isolation air gap; 34. Sixth magnetic isolation air gap; 35. Seventh magnetic isolation air gap; 36. Eighth magnetic isolation air gap; 37. Ninth magnetic isolation air gap; 38. Tenth magnetic isolation air gap; 39. Eleventh magnetic isolation air gap; 30. Twelfth magnetic isolation air gap. Air gaps 40, 13th magnetic isolation air gap 41, 14th magnetic isolation air gap 42, 15th magnetic isolation air gap 43, 16th magnetic isolation air gap 44, and 17th magnetic isolation 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 with an angle of 11.25° with the center line of the first N magnetic pole. A first arc-shaped magnetic isolation air gap penetrating the thickness of the rotor lamination is provided at the outer end of the first rectangular groove. The outer end of the first arc-shaped magnetic isolation air gap is not connected to the outer circle of the rotor lamination, while the inner end of the first arc-shaped magnetic isolation air gap is connected to the outer end of the first rectangular groove, forming a circle with a diameter larger than the first rectangular groove. The width of the rectangular slot is such that a first magnetic isolation air gap 29 penetrating the thickness of the rotor lamination is provided at the inner end of the first rectangular slot, and the outer end of the first magnetic isolation air gap 29 is connected to the inner end of the first rectangular slot. A second rectangular slot with a tangential structure penetrating the thickness of the rotor lamination is provided between the inner end of the first magnetic isolation air gap 29 and the center line of the first N magnetic pole. The right end of the second rectangular slot is to the left of the center line of the first N magnetic pole, and the left end of the second rectangular slot is connected to the inner end of the first magnetic isolation air gap 29. The width of the first magnetic isolation air gap 29 is smaller than the width of the first rectangular slot and the width of the second rectangular slot. It is located near the outer circle of the rotor lamination and to the right of the center line of the first N magnetic pole, with an angle of 11° with the center line of the first N magnetic pole.A third rectangular slot penetrating the thickness of the rotor lamination is provided to the left of the 25° center line. A second arc-shaped magnetic air gap penetrating the thickness of the rotor lamination is provided at the outer end of the third 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 third rectangular slot, forming a circle whose diameter is larger than the width of the third rectangular slot. A second magnetic air gap 30 penetrating the thickness of the rotor lamination is provided at the inner end of the third rectangular slot. The outer end of the second magnetic air gap 30 is connected to the inner end of the third rectangular slot. A fourth rectangular slot with a tangential structure penetrating the thickness of the rotor lamination is provided between the inner end of the second magnetic air gap 30 and the center line of the first N magnetic pole. The left end of the fourth rectangular slot is to the right of the center line of the first N magnetic pole. The left end of the fourth rectangular slot is not connected to the right end of the second rectangular slot. The right end of the fourth rectangular slot is connected to the inner end of the second magnetic isolation air gap 30. The width of the second magnetic isolation air gap 30 is smaller than the width of the third rectangular slot and the width of the fourth rectangular slot. The lower end of the fourth rectangular slot is on the same straight line as the lower end of the second rectangular slot. Near the outer circle of the rotor lamination and on the center line of the first N magnetic pole, there is a third magnetic isolation air gap 31 that penetrates the thickness of the rotor lamination. The outer end of the third magnetic isolation air gap 31 is not connected to the outer circle of the rotor lamination. The inner end of the third magnetic isolation air gap 31 is not connected to the upper end of the second rectangular slot or the upper end of the fourth rectangular slot. Near the outer circle of the rotor lamination and between the third magnetic isolation air gap 31 and the first rectangular slot, there is a fifth rectangular slot that penetrates the thickness of the rotor lamination. The length of the fifth rectangular slot is... The centerline in the direction is parallel to the first N magnetic pole line. The outer end of the fifth rectangular slot is not connected to the outer circle of the rotor lamination. The inner end of the fifth rectangular slot is provided with 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 fifth rectangular slot. The length of the twenty-second rectangular slot is less than the width of the fifth rectangular slot. The lower end of the twenty-second rectangular slot is provided with a fourth magnetic isolation air gap 32 that penetrates the thickness of the rotor lamination. The length of the fourth magnetic isolation air gap 32 is greater than the length of the twenty-second rectangular slot. The left end of the fourth magnetic isolation air gap 32 is on the same straight line as the left end of the twenty-second rectangular slot. Between the fourth magnetic isolation air gap 32 and the third magnetic isolation air gap 31, there is a sixth rectangular slot with a tangential structure that penetrates the thickness of the rotor lamination. The left end of the sixth rectangular slot is connected to the right end of the fourth magnetic isolation air gap 32. The sixth rectangular slot is connected to the third magnetic air gap 31, and its width is greater than that of the fourth magnetic air gap 32. A twenty-third rectangular slot, penetrating the thickness of the rotor lamination, is provided at the right end of the sixth rectangular slot. The left end of the twenty-third rectangular slot is connected to the right end of the sixth rectangular slot, and its length is less than its width. The right end of the twenty-third rectangular slot is connected to the third magnetic air gap 31. A seventh rectangular slot, penetrating the thickness of the rotor lamination, is provided near the outer circle of the rotor lamination and between the third magnetic air gap 31 and the third rectangular slot. The outer end of the seventh rectangular slot is not connected to the outer circle of the rotor lamination, the outer end of the third rectangular slot, or the outer end of the third magnetic air gap 31. The inner end of the seventh rectangular slot is connected to the inner end of the third magnetic air gap 31, and the width of the third magnetic air gap 31 is less than the width of the seventh rectangular slot. Along a clockwise direction, near the outer circle of the rotor lamination, to the left of the center line of the first S magnetic pole and to the right of the center line at an angle of 11.25° to the center line of the first S magnetic pole, an eighth rectangular slot penetrating the thickness of the rotor lamination is provided. The outer end of the eighth rectangular slot is not connected to the outer circle of the rotor lamination. The inner end of the eighth rectangular slot is provided with a fifth magnetic isolation gap 33 penetrating the thickness of the rotor lamination. The outer end of the fifth magnetic isolation gap 33 is connected to the inner end of the eighth rectangular slot, and the width of the fifth magnetic isolation gap 33 is smaller than the width of the eighth rectangular slot. The inner end of the fifth magnetic isolation gap 33 extends to the left of the center line of the first S magnetic pole and is not connected to the inner circle of the rotor lamination. Near the outer circle of the rotor lamination and to the right of the center line at an angle of 11.25° to the center line of the first S magnetic pole, an eighth rectangular slot penetrating the thickness of the rotor lamination is provided. A ninth rectangular slot, penetrating the thickness of the rotor lamination, is located to the right of the center line of the S magnetic pole and to the left of the center line at an angle of 11.25° to the center line of the first S magnetic pole. The outer end of the ninth rectangular slot is not connected to the outer circle of the rotor lamination. A sixth magnetic isolation air gap 34, penetrating the thickness of the rotor lamination, is located at the inner end of the ninth rectangular slot. The outer end of the sixth magnetic isolation air gap 34 is connected to the inner end of the ninth rectangular slot, and the width of the sixth magnetic isolation air gap 34 is smaller than the width of the ninth rectangular slot. The inner end of the sixth magnetic isolation air gap 34 extends to the right of the center line of the first S magnetic pole and is not connected to the inner circle of the rotor lamination. The inner end of the sixth magnetic isolation air gap 34 is not connected to the inner end of the fifth magnetic isolation air gap 33. The lowest end of the fifth magnetic air gap 33 and the lowest end of the inner end of the fifth magnetic air gap 33 are on the same straight line. Near the outer circle of the rotor lamination and on the center line of the first S magnetic pole, a seventh magnetic air gap 35 penetrating the thickness of the rotor lamination is provided. The outer end of the seventh magnetic air gap 35 is not connected to the outer circle of the rotor lamination. Between the seventh magnetic air gap 35 and the eighth rectangular slot, a tenth rectangular slot penetrating the thickness of the rotor lamination is provided. The outer end of the tenth rectangular slot is not connected to the outer circle of the rotor lamination, the outer end of the eighth rectangular slot, or the outer end of the seventh magnetic air gap 35. The inner end of the tenth rectangular slot is connected to the inner end of the seventh magnetic air gap 35, and the width of the seventh magnetic air gap 35 is smaller than the width of the tenth rectangular slot. The inner end of the magnetic isolation air gap 35 is not connected to the inner end of the fifth magnetic isolation air gap 33 or the inner end of the sixth magnetic isolation air gap 34. Near the outer circle of the rotor lamination and between the seventh magnetic isolation air gap 35 and the ninth rectangular slot, there are two eleventh rectangular slots with a "V" shaped structure that penetrate the thickness of the rotor lamination. The inner ends of the two eleventh rectangular slots with a "V" shaped structure are not connected. The outer end of the eleventh rectangular slot on the left of the two eleventh rectangular slots with a "V" shaped structure is not connected to the outer circle of the rotor lamination or the outer end of the seventh magnetic isolation air gap 35. The outer end of the eleventh rectangular slot on the right of the two eleventh rectangular slots with a "V" shaped structure is not connected to the outer circle of the rotor lamination or the outer end of the ninth rectangular 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 11.25° to the center line of the second N magnetic pole, a twelfth rectangular slot penetrating the thickness of the rotor lamination is provided. At the outer end of the twelfth 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, while the inner end of the third arc-shaped magnetic isolation gap is connected to the outer end of the twelfth rectangular slot, forming the third arc-shaped magnetic isolation gap. The diameter of the circle is greater than the width of the twelfth rectangular slot. An eighth magnetic isolation air gap 36 with a tangential structure is provided between the inner end of the twelfth rectangular slot and the center line of the second N magnetic pole. The left end of the eighth magnetic isolation air gap 36 is connected to the inner end of the twelfth rectangular slot and the width of the eighth magnetic isolation air gap 36 is less than the width of the twelfth rectangular slot. The right end of the eighth magnetic isolation air gap 36 is to the left of the center line of the second N magnetic pole, 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 11 with the center line of the second N magnetic pole.A thirteenth rectangular slot, penetrating the thickness of the rotor lamination, is located to the left of the 25° centerline. A fourth arc-shaped magnetic air gap, also penetrating the thickness of the rotor lamination, is located at the outer end of the thirteenth rectangular slot. The outer end of the fourth arc-shaped magnetic air gap is not connected to the outer circle of the rotor lamination, but the inner end of the fourth arc-shaped magnetic air gap is connected to the outer end of the thirteenth rectangular slot, forming a circle whose diameter is larger than the width of the thirteenth rectangular slot. A ninth magnetic air gap 37, tangentially oriented, is located between the inner end of the thirteenth rectangular slot and the centerline of the second N magnetic pole. The right end of the ninth magnetic air gap 37 is connected to the outer end of the thirteenth rectangular slot. The inner ends of the slots are connected, and the width of the ninth magnetic isolation air gap 37 is smaller than the width of the thirteenth rectangular slot. The left end of the ninth magnetic isolation air gap 37 is to the right of the center line of the second N magnetic pole. The left end of the ninth magnetic isolation air gap 37 is not connected to the right end of the eighth magnetic isolation air gap 36. The lower end of the ninth magnetic isolation air gap 37 is on the same straight line as the lower end of the eighth magnetic isolation air gap 36. Near the outer circle of the rotor lamination and on the center line of the second N magnetic pole, there is a tenth magnetic isolation air gap 38 that penetrates the thickness of the rotor lamination. The outer end of the tenth magnetic isolation air gap 38 is not connected to the outer circle of the rotor lamination. Near the outer circle of the rotor lamination and on the twelfth rectangular slot, the tenth magnetic isolation air gap 38 penetrates the thickness of the rotor lamination. A twenty-first rectangular slot, penetrating the thickness of the rotor lamination, is provided between the rectangular slot and the tenth magnetic isolation air gap 38. The centerline of the twenty-first rectangular slot along its length is parallel to the centerline of the second N magnetic pole. The outer end of the twenty-first rectangular slot is not connected to the outer circle of the rotor lamination, the outer end of the twelfth rectangular slot, or the outer end of the tenth magnetic isolation air gap 38. A seventeenth magnetic isolation air gap 45, penetrating the thickness of the rotor lamination and tangentially structured, is provided between the inner end of the twenty-first rectangular slot and the tenth magnetic isolation air gap 38. The left end of the seventeenth magnetic isolation air gap 45 is connected to the inner end of the twenty-first rectangular slot. The width of the seventeenth magnetic isolation air gap 45 is... The width is less than that of the twenty-first rectangular slot. The right end of the seventeenth magnetic air gap 45 is connected to the inner end of the tenth magnetic air gap 38. Near the outer circle of the rotor lamination and between the tenth magnetic air gap 38 and the thirteenth rectangular slot, there is a semi-circular slot that penetrates the thickness of the rotor lamination. The inner arc surface of the semi-circular slot faces the outer circle of the rotor lamination. The outer end of the semi-circular slot is not connected to the outer circle of the rotor lamination. The inner end of the semi-circular slot is not connected to the upper end of the ninth magnetic air gap 37. The left end of the semi-circular slot is not connected to the outer end of the tenth magnetic air gap 38. The right end of the semi-circular slot is not connected to the outer end of the thirteenth rectangular slot. Along a clockwise direction, near the outer circle of the rotor lamination, to the left of the center line of the second S magnetic pole and to the right of the center line at an angle of 11.25° to the center line of the second S magnetic pole, an eleventh magnetic isolation gap 39 penetrating the thickness of the rotor lamination is provided. The outer end of the eleventh magnetic isolation gap 39 is not connected to the outer circle of the rotor lamination. The inner end of the eleventh magnetic isolation gap 39 is provided, penetrating the thickness of the rotor lamination. The width of the fourteenth rectangular groove is greater than the width of the eleventh magnetic isolation gap 39. The inner end of the fourteenth rectangular groove extends inward to the left of the center line of the second S magnetic pole. The inner end of the fourteenth rectangular groove 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 second S magnetic pole and to the left of the center line at an angle of 11.25° to the center line of the second S magnetic pole, a fourteenth rectangular groove is provided. A twelfth magnetic air gap 40 penetrates the thickness of the rotor lamination. The outer end of the twelfth magnetic air gap 40 is not connected to the outer circle of the rotor lamination. A fifteenth rectangular groove penetrating the thickness of the rotor lamination is provided at the inner end of the twelfth magnetic air gap 40. The width of the fifteenth rectangular groove is greater than the width of the twelfth magnetic air gap 40. The inner end of the fifteenth rectangular groove extends inward to the right side of the center line of the second S magnetic pole. The inner end of the fifteenth rectangular groove is not connected to the inner circle of the rotor lamination. The inner end of the fifteenth rectangular groove is not connected to the inner end of the fourteenth rectangular groove. The lowest point of the inner end of the fifteenth rectangular groove is on the same straight line as the lowest point of the inner end of the fourteenth rectangular groove. A sixteenth rectangular groove with a tangential structure penetrating the thickness of the rotor lamination is provided near the outer circle of the rotor lamination, and the center line of the sixteenth rectangular groove in the length direction is... Perpendicular to the center line of the second S magnetic pole, a twenty-fourth rectangular slot penetrating the thickness of the rotor lamination is provided at the left end of the sixteenth rectangular slot. The right end of the twenty-fourth rectangular slot is connected to the left end of the sixteenth rectangular slot, and the length of the twenty-fourth rectangular slot is less than the width of the sixteenth rectangular slot. A thirteenth magnetic isolation air gap 41 penetrating the thickness of the rotor lamination is provided at the left end of the twenty-fourth rectangular slot. The left end of the twenty-fourth rectangular slot is connected to the right end of the thirteenth magnetic isolation air gap 41, and the length of the twenty-fourth rectangular slot is equal to the width of the thirteenth magnetic isolation air gap 41. A twenty-fifth rectangular slot penetrating the thickness of the rotor lamination is provided at the upper end of the thirteenth magnetic isolation air gap 41. The inner end of the twenty-fifth rectangular slot is connected to the upper end of the thirteenth magnetic isolation air gap 41, and the length of the twenty-fifth rectangular slot is equal to the width of the thirteenth magnetic isolation air gap 41. The length of the 25th rectangular slot is such that the left end of the 25th rectangular slot is on the same straight line as the left end of the 13th magnetic gap 41. A 17th rectangular slot, penetrating the thickness of the rotor lamination and parallel to the center line of the second S magnetic pole, is located above the 25th rectangular slot. The outer end of the 17th rectangular slot is not connected to the outer circle of the rotor lamination. The inner end of the 17th rectangular slot is connected to the upper end of the 24th rectangular slot, and the width of the 17th rectangular slot is greater than the length of the 24th rectangular slot. A 26th rectangular slot, penetrating the thickness of the rotor lamination, is located at the right end of the 16th rectangular slot. The left end of the 26th rectangular slot is connected to the right end of the 16th rectangular slot, and the length of the 26th rectangular slot is less than the width of the 16th rectangular slot. A 14th magnetic gap 42, penetrating the thickness of the rotor lamination, is located at the right end of the 26th rectangular slot.The right end of the twenty-sixth rectangular slot is connected to the left end of the fourteenth magnetic air gap 42, and the length of the twenty-sixth rectangular slot is equal to the width of the fourteenth magnetic air gap 42. A twenty-seventh rectangular slot, penetrating the thickness of the rotor lamination, is provided at the upper end of the fourteenth magnetic air gap 42. The inner end of the twenty-seventh rectangular slot is connected to the upper end of the fourteenth magnetic air gap 42, and the length of the twenty-seventh rectangular slot is equal to the length of the fourteenth magnetic air gap 42. The right end of the twenty-seventh rectangular slot is on the same straight line as the right end of the fourteenth magnetic air gap 42. A through-rotor lamination is provided at the upper end of the twenty-seventh rectangular slot. An eighteenth rectangular slot, parallel to the center line of the second S magnetic pole, is provided near the outer circle of the rotor lamination. The outer end of the eighteenth rectangular slot is not connected to the outer circle of the rotor lamination. The inner end of the eighteenth rectangular slot is connected to the upper end of the twenty-seventh rectangular slot, and the width of the eighteenth rectangular slot is greater than the length of the twenty-seventh rectangular slot. A nineteenth rectangular slot, penetrating the thickness of the rotor lamination, is provided near the outer circle of the rotor lamination and between the eleventh magnetic gap 39 and the seventeenth rectangular slot. The outer end of the nineteenth rectangular slot is not connected to the outer circle of the rotor lamination, the outer end of the eleventh magnetic gap 39, or the outer end of the seventeenth rectangular slot. The inner end of the nineteenth rectangular slot is provided with a fifteenth magnetic isolation air gap 43 that penetrates the thickness of the rotor lamination. The outer end of the fifteenth magnetic isolation air gap 43 is connected to the inner end of the nineteenth rectangular slot, and the width of the fifteenth magnetic isolation air gap 43 is smaller than the width of the nineteenth rectangular slot. The inner end of the fifteenth magnetic isolation air gap 43 extends inward to the left side of the center line of the second S magnetic pole. Near the outer circle of the rotor lamination and between the twelfth magnetic isolation air gap 40 and the eighteenth rectangular slot, a sixteenth magnetic isolation air gap 44 that penetrates the thickness of the rotor lamination is provided. The outer end of the sixteenth magnetic isolation air gap 44 is connected to the outer circle of the rotor lamination. The outer ends of the twelfth magnetic air gap 40 and the eighteenth rectangular slot are not connected. A twentieth rectangular slot, tangential in structure, is provided between the inner end of the sixteenth magnetic air gap 44 and the center line of the second S magnetic pole, penetrating the thickness of the rotor lamination. The right end of the twentieth rectangular slot is connected to the inner end of the sixteenth magnetic air gap 44, and the width of the twentieth rectangular slot is greater than the width of the sixteenth magnetic air gap 44. The left end of the twentieth rectangular slot is not connected to the inner end of the fifteenth magnetic air gap 43. The lower end of the twentieth rectangular slot is on the same straight line as the lowest point of the inner end of the fifteenth magnetic air gap 43. 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 6 is installed in the first rectangular slot with its right side polarity as the N pole. The second rectangular ferrite permanent magnet 9 is installed in the second rectangular slot with its upper side polarity as the N pole. The third rectangular ferrite permanent magnet 16 is installed in the third rectangular slot with its left side polarity as the N pole. The fourth rectangular ferrite permanent magnet 17 is installed in the fourth rectangular slot with its upper side polarity as the N pole. The first rectangular NdFeB permanent magnet 1... 8. The first rectangular NdFeB permanent magnet 18 is installed in the fifth rectangular slot with its right side polarity as the N pole. The second rectangular NdFeB permanent magnet 19 is installed in the sixth rectangular slot with its upper side polarity as the N pole. The third rectangular NdFeB permanent magnet 7 is installed in the seventh rectangular slot with its left side polarity as the N pole, forming the first N pole of the permanent magnet rotor. The fourth rectangular NdFeB permanent magnet 8 is installed in the eighth rectangular slot with its right side polarity as the S pole. The fifth rectangular NdFeB permanent magnet 20 is installed in the ninth rectangular slot with its left side polarity as the S pole. The sixth rectangular NdFeB permanent magnet 19 is installed in the seventh rectangular slot with its upper side polarity as the N pole. The NdFeB permanent magnet 21 is installed in the tenth rectangular slot with the right side polarity of the sixth rectangular NdFeB permanent magnet 21 as the S pole. Two identical eleventh rectangular NdFeB permanent magnets 22 are installed in two eleventh rectangular slots with opposite sides having the S pole polarity, forming the first S pole of the permanent magnet rotor. The fifth rectangular ferrite permanent magnet 23 is installed in the twelfth rectangular slot with the right side polarity of the fifth rectangular ferrite permanent magnet 23 as the N pole. The sixth rectangular ferrite permanent magnet 24 is installed in the thirteenth rectangular slot with the left side polarity of the sixth rectangular ferrite permanent magnet 24 as the N pole. The eighth rectangular NdFeB permanent magnet 25 is installed in the eighth rectangular NdFeB permanent magnet... The boron permanent magnet steel 25 is installed in the twenty-first rectangular slot with the right side polarity as the N pole. The semi-circular NdFeB permanent magnet steel 11 is installed in the semi-circular slot with the inner arc surface polarity as the N pole, forming the second N pole of the permanent magnet rotor. The ninth rectangular NdFeB permanent magnet steel 12 is installed in the fourteenth rectangular slot with the right side polarity as the S pole. The tenth rectangular NdFeB permanent magnet steel 26 is installed in the fifteenth rectangular slot with the left side polarity as the S pole. The eleventh rectangular NdFeB permanent magnet steel 14 is installed in the sixteenth rectangular slot with a tangential structure with the upper side polarity as the S pole.The twelfth rectangular NdFeB permanent magnet 15 is installed in the seventeenth rectangular slot with its right side polarity as the S pole. The thirteenth rectangular NdFeB permanent magnet 27 is installed in the eighteenth rectangular slot with its left side polarity as the S pole. The fourteenth rectangular NdFeB permanent magnet 28 is installed in the nineteenth rectangular slot with its right side polarity as the S pole. The fifteenth rectangular NdFeB permanent magnet 13 is installed in the twentieth rectangular slot with a tangential structure, with its upper side polarity as the S pole, forming the second S pole of the permanent magnet rotor. This process is repeated to form a combined permanent magnet rotor with NdFeB permanent magnets and ferrite permanent magnets synergistically excited, arranged with alternating N and S poles.

Claims

1. A neodymium iron boron permanent magnet and ferrite permanent magnet co-excitation motor, comprising a front end cover (10), a rear end cover (1), a housing (5), a rotor, and a stator, characterized in that: The motor rotor is a combined permanent magnet rotor with neodymium iron boron permanent magnets and ferrite permanent magnets for synergistic excitation; The combined permanent magnet rotor with neodymium iron boron (NdFeB) permanent magnet and ferrite permanent magnet synergistic excitation includes a shaft (2), a rotor core (3), a first rectangular ferrite permanent magnet (6), a second rectangular ferrite permanent magnet (9), a third rectangular ferrite permanent magnet (16), a fourth rectangular ferrite permanent magnet (17), a fifth rectangular ferrite permanent magnet (23), a sixth rectangular ferrite permanent magnet (24), a first rectangular NdFeB permanent magnet (18), a second rectangular NdFeB permanent magnet (19), a third rectangular NdFeB permanent magnet (7), a fourth rectangular NdFeB permanent magnet (8), a fifth rectangular NdFeB permanent magnet (20), a sixth rectangular NdFeB permanent magnet (21), a seventh rectangular NdFeB permanent magnet (22), an eighth rectangular NdFeB permanent magnet (25), and a ninth rectangular NdFeB permanent magnet (25). Neodymium iron boron permanent magnet (12), tenth rectangular neodymium iron boron permanent magnet (26), eleventh rectangular neodymium iron boron permanent magnet (14), twelfth rectangular neodymium iron boron permanent magnet (15), thirteenth rectangular neodymium iron boron permanent magnet (27), fourteenth rectangular neodymium iron boron permanent magnet (28), fifteenth rectangular neodymium iron boron permanent magnet (13), semi-circular neodymium iron boron permanent magnet (11), first magnetic isolation air gap (29), second magnetic isolation air gap (30), third magnetic isolation air gap (31), fourth magnetic isolation air gap (32), fifth magnetic isolation air gap (33), sixth magnetic isolation air gap (34), seventh magnetic isolation air gap (35), eighth magnetic isolation air gap (36), ninth magnetic isolation air gap (37), tenth magnetic isolation air gap (38), eleventh magnetic isolation air gap (39), twelfth magnetic isolation air gap ( 40), the thirteenth magnetic air gap (41), the fourteenth magnetic air gap (42), the fifteenth magnetic air gap (43), the sixteenth magnetic air gap (44), and the seventeenth 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 with an angle of 11.25° with 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 groove. 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 groove, and the diameter of the circle forming the first arc-shaped magnetic air gap is larger than the width of the first rectangular groove. A magnetic air gap penetrating the thickness of the rotor lamination is provided at the inner end of the first rectangular groove. A first magnetic isolation air gap (29) is provided, the outer end of which is connected to the inner end of a first rectangular slot. A second rectangular slot with a tangential structure, penetrating the thickness of the rotor lamination, is provided between the inner end of the first magnetic isolation air gap (29) and the center line of the first N magnetic pole. The right end of the second rectangular slot is to the left of the center line of the first N magnetic pole, and the left end of the second rectangular slot is connected to the inner end of the first magnetic isolation air gap (29). The width of the first magnetic isolation air gap (29) is smaller than the width of the first rectangular slot and the width of the second rectangular slot. A third 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 with an angle of 11.25° with 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 third 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 third rectangular slot, and the diameter of the circle of the second arc-shaped magnetic air gap is larger than the width of the third rectangular slot. A second magnetic air gap (30) penetrating the thickness of the rotor lamination is provided at the inner end of the third rectangular slot. The outer end of the second magnetic air gap (30) is connected to the inner end of the third rectangular slot. A fourth rectangular slot with a tangential structure penetrating the thickness of the rotor lamination is provided between the inner end of the second magnetic air gap (30) and the center line of the first N magnetic pole. The left end of the fourth rectangular slot is to the right of the center line of the first N magnetic pole. The left end of the fourth rectangular slot is not connected to the right end of the second rectangular slot. The right end of the fourth rectangular slot is connected to the inner end of the second magnetic air gap (30). The width of the magnetic air gap (30) is smaller than the width of the third rectangular slot and the width of the fourth rectangular slot. The lower end of the fourth rectangular slot is on the same straight line as the lower end of the second rectangular slot. A third magnetic air gap (31) is provided near the outer circle of the rotor lamination and on the center line of the first N magnetic pole, penetrating the thickness of the rotor lamination. The outer end of the third magnetic air gap (31) is not connected to the outer circle of the rotor lamination. The inner end of the third magnetic air gap (31) is not connected to the upper end of the second rectangular slot or the upper end of the fourth rectangular slot. A fifth rectangular slot is provided near the outer circle of the rotor lamination and between the third magnetic air gap (31) and the first rectangular slot, penetrating the thickness of the rotor lamination. The center line of the fifth rectangular slot in the length direction is parallel to the first N magnetic pole line. The outer end of the fifth rectangular slot is parallel to the outer circle of the rotor lamination. The circles are not connected. The inner end of the fifth rectangular slot is provided with 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 fifth rectangular slot. The length of the twenty-second rectangular slot is less than the width of the fifth rectangular slot. The lower end of the twenty-second rectangular slot is provided with a fourth magnetic isolation air gap (32) that penetrates the thickness of the rotor lamination. The length of the fourth magnetic isolation air gap (32) is greater than the length of the twenty-second rectangular slot. The left end of the fourth magnetic isolation air gap (32) is on the same straight line as the left end of the twenty-second rectangular slot. Between the fourth magnetic isolation air gap (32) and the third magnetic isolation air gap (31), there is a sixth rectangular slot with a tangential structure that penetrates the thickness of the rotor lamination. The left end of the sixth rectangular slot is connected to the right end of the fourth magnetic isolation air gap (32), and the width of the sixth rectangular slot is greater than that of the fourth magnetic isolation air gap (31). The width of the magnetic isolation air gap (32) is such that a twenty-third rectangular groove penetrating the thickness of the rotor lamination is provided at the right end of the sixth rectangular groove, the left end of the twenty-third rectangular groove is connected to the right end of the sixth rectangular groove and the length of the twenty-third rectangular groove is less than the width of the sixth rectangular groove, the right end of the twenty-third rectangular groove is connected to the third magnetic isolation air gap (31), and a seventh rectangular groove penetrating the thickness of the rotor lamination is provided near the outer circle of the rotor lamination and between the third magnetic isolation air gap (31) and the third rectangular groove, the outer end of the seventh rectangular groove is not connected to the outer circle of the rotor lamination, the outer end of the third rectangular groove, or the outer end of the third magnetic isolation air gap (31), the inner end of the seventh rectangular groove is connected to the inner end of the third magnetic isolation air gap (31) and the width of the third magnetic isolation air gap (31) is less than the width of the seventh rectangular groove; Along a clockwise direction, near the outer circle of the rotor lamination, to the left of the center line of the first S magnetic pole and to the right of the center line at an angle of 11.25° to the center line of the first S magnetic pole, an eighth rectangular slot penetrating the thickness of the rotor lamination is provided. The outer end of the eighth rectangular slot is not connected to the outer circle of the rotor lamination. The inner end of the eighth rectangular slot is provided with a fifth magnetic isolation gap (33) penetrating the thickness of the rotor lamination. The outer end of the fifth magnetic isolation gap (33) is connected to the inner end of the eighth rectangular slot, and the width of the fifth magnetic isolation gap (33) is smaller than the width of the eighth rectangular slot. The inner end of the fifth magnetic isolation gap (33) extends to the left of the center line of the first S magnetic pole and is not connected to the inner circle of the rotor lamination. Near the outer circle of the rotor lamination and to the right of the center line of the first S magnetic pole, an eighth rectangular slot penetrating the thickness of the rotor lamination is provided. A ninth rectangular slot, penetrating the thickness of the rotor lamination, is provided to the right of the centerline and to the left of the centerline of the first S magnetic pole at an angle of 11.25°. The outer end of the ninth rectangular slot is not connected to the outer circle of the rotor lamination. A sixth magnetic isolation air gap (34), penetrating the thickness of the rotor lamination, is provided at the inner end of the ninth rectangular slot. The outer end of the sixth magnetic isolation air gap (34) is connected to the inner end of the ninth rectangular slot, and the width of the sixth magnetic isolation air gap (34) is smaller than the width of the ninth rectangular slot. The inner end of the sixth magnetic isolation air gap (34) extends to the right of the centerline of the first S magnetic pole and is not connected to the inner circle of the rotor lamination. The inner end of the sixth magnetic isolation air gap (34) is not connected to the inner end of the fifth magnetic isolation air gap (33). The lowest end of the fifth magnetic air gap (33) and the lowest end of the inner end of the fifth magnetic air gap (33) are on the same straight line. Near the outer circle of the rotor lamination and on the center line of the first S magnetic pole, there is a seventh magnetic air gap (35) that penetrates the thickness of the rotor lamination. The outer end of the seventh magnetic air gap (35) is not connected to the outer circle of the rotor lamination. Between the seventh magnetic air gap (35) and the eighth rectangular slot, there is a tenth rectangular slot that penetrates the thickness of the rotor lamination. The outer end of the tenth rectangular slot is not connected to the outer circle of the rotor lamination, the outer end of the eighth rectangular slot, or the outer end of the seventh magnetic air gap (35). The inner end of the tenth rectangular slot is connected to the inner end of the seventh magnetic air gap (35), and the width of the seventh magnetic air gap (35) is smaller than the width of the tenth rectangular slot. The inner end of the seventh magnetic gap (35) is not connected to the inner end of the fifth magnetic gap (33) and the inner end of the sixth magnetic gap (34). Near the outer circle of the rotor lamination and between the seventh magnetic gap (35) and the ninth rectangular slot, there are two eleventh rectangular slots with a "V" shaped structure that penetrate the thickness of the rotor lamination. The inner ends of the two eleventh rectangular slots with a "V" shaped structure are not connected. The outer end of the eleventh rectangular slot on the left side of the two eleventh rectangular slots with a "V" shaped structure is not connected to the outer circle of the rotor lamination and the outer end of the seventh magnetic gap (35). The outer end of the eleventh rectangular slot on the right side of the two eleventh rectangular slots with a "V" shaped structure is not connected to the outer circle of the rotor lamination and the outer end of the ninth rectangular 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 11.25° to the center line of the second N magnetic pole, a twelfth rectangular slot penetrating the thickness of the rotor lamination is provided. At the outer end of the twelfth 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, while the inner end of the third arc-shaped magnetic isolation gap is connected to the outer end of the twelfth rectangular slot, forming the diameter of the circle of the third arc-shaped magnetic isolation gap. The width of the eighth magnetic air gap (36) is greater than that of the twelfth rectangular slot. A tangentially oriented eighth magnetic air gap (36) is provided between the inner end of the twelfth rectangular slot and the center line of the second N magnetic pole. The left end of the eighth magnetic air gap (36) is connected to the inner end of the twelfth rectangular slot and the width of the eighth magnetic air gap (36) is less than that of the twelfth rectangular slot. The right end of the eighth magnetic air gap (36) is to the left of the center line of the second N magnetic pole, near the outer circle of the rotor lamination and to the right of the center line of the second N magnetic pole, and the angle between the eighth magnetic air gap (36) and the center line of the second N magnetic pole is 11.A thirteenth rectangular slot penetrating the thickness of the rotor lamination is provided on the left side of the 25° center line. A fourth arc-shaped magnetic air gap penetrating the thickness of the rotor lamination is provided at the outer end of the thirteenth 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 thirteenth rectangular slot, and the diameter of the circle of the fourth arc-shaped magnetic air gap is larger than the width of the thirteenth rectangular slot. A ninth magnetic air gap (37) with a tangential structure is provided between the inner end of the thirteenth rectangular slot and the center line of the second N magnetic pole. The right end of the ninth magnetic air gap (37) is connected to the inner end of the thirteenth rectangular slot. Furthermore, the width of the ninth magnetic gap (37) is smaller than the width of the thirteenth rectangular slot. The left end of the ninth magnetic gap (37) is to the right of the center line of the second N magnetic pole. The left end of the ninth magnetic gap (37) is not connected to the right end of the eighth magnetic gap (36). The lower end of the ninth magnetic gap (37) is on the same straight line as the lower end of the eighth magnetic gap (36). Near the outer circle of the rotor lamination and on the center line of the second N magnetic pole, there is a tenth magnetic gap (38) that penetrates the thickness of the rotor lamination. The outer end of the tenth magnetic gap (38) is not connected to the outer circle of the rotor lamination. Near the outer circle of the rotor lamination and on the center line of the twelfth rectangular slot, there is a tenth magnetic gap (38) that penetrates the thickness of the rotor lamination. A 21st rectangular slot, penetrating the thickness of the rotor lamination, is provided between the shaped slot and the 12th rectangular slot (38). The centerline of the 21st rectangular slot along its length is parallel to the centerline of the 2nd N magnetic pole. The outer end of the 21st rectangular slot is not connected to the outer circle of the rotor lamination, the outer end of the 12th rectangular slot, or the outer end of the 10th magnetic gap (38). A 17th magnetic gap (45), penetrating the thickness of the rotor lamination and tangentially structured, is provided between the inner end of the 21st rectangular slot and the 10th magnetic gap (38). The left end of the 17th magnetic gap (45) is connected to the inner end of the 21st rectangular slot. The width of the 17th magnetic gap (45) is... The width is less than that of the twenty-first rectangular slot. The right end of the seventeenth magnetic air gap (45) is connected to the inner end of the tenth magnetic air gap (38). A semi-circular slot penetrating the thickness of the rotor lamination is provided near the outer circle of the rotor lamination and between the tenth magnetic air gap (38) and the thirteenth rectangular slot. The inner arc surface of the semi-circular slot faces the outer circle of the rotor lamination. The outer end of the semi-circular slot is not connected to the outer circle of the rotor lamination. The inner end of the semi-circular slot is not connected to the upper end of the ninth magnetic air gap (37). The left end of the semi-circular slot is not connected to the outer end of the tenth magnetic air gap (38). The right end of the semi-circular slot is not connected to the outer end of the thirteenth rectangular slot. An eleventh magnetic air gap (39) penetrating the thickness of the rotor lamination is provided near the outer circle of the rotor lamination, to the left of the center line of the second S magnetic pole, and to the right of the center line at an angle of 11.25° to the center line of the second S magnetic pole. The outer end of the eleventh magnetic air gap (39) is not connected to the outer circle of the rotor lamination. The inner end of the eleventh magnetic air gap (39) is provided with a fourteenth rectangular groove penetrating the thickness of the rotor lamination. The width of the fourteenth rectangular groove is greater than the width of the eleventh magnetic air gap (39). The inner end of the fourteenth rectangular groove extends inward to the left of the center line of the second S magnetic pole. The inner end of the fourteenth rectangular groove 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 second S magnetic pole, and at an angle of 11.25° to the center line of the second S magnetic pole. A twelfth magnetic air gap (40) penetrating the thickness of the rotor lamination is provided on the left side of the center line. The outer end of the twelfth magnetic air gap (40) is not connected to the outer circle of the rotor lamination. A fifteenth rectangular groove penetrating the thickness of the rotor lamination is provided at the inner end of the twelfth magnetic air gap (40). The width of the fifteenth rectangular groove is greater than the width of the twelfth magnetic air gap (40). The inner end of the fifteenth rectangular groove extends inward to the right side of the center line of the second S magnetic pole. The inner end of the fifteenth rectangular groove is not connected to the inner circle of the rotor lamination. The inner end of the fifteenth rectangular groove is not connected to the inner end of the fourteenth rectangular groove. The lowest point of the inner end of the fifteenth rectangular groove is on the same straight line as the lowest point of the inner end of the fourteenth rectangular groove. A sixteenth rectangular groove with a tangential structure penetrating the thickness of the rotor lamination is provided near the outer circle of the rotor lamination. The centerline of the sixteenth rectangular slot along its length is perpendicular to the centerline of the second S magnetic pole. A twenty-fourth rectangular slot, penetrating the thickness of the rotor lamination, is provided at the left end of the sixteenth rectangular slot. The right end of the twenty-fourth rectangular slot is connected to the left end of the sixteenth rectangular slot, and the length of the twenty-fourth rectangular slot is less than the width of the sixteenth rectangular slot. A thirteenth magnetic air gap (41), penetrating the thickness of the rotor lamination, is provided at the left end of the twenty-fourth rectangular slot. The left end of the twenty-fourth rectangular slot is connected to the right end of the thirteenth magnetic air gap (41), and the length of the twenty-fourth rectangular slot is equal to the width of the thirteenth magnetic air gap (41). A twenty-fifth rectangular slot, penetrating the thickness of the rotor lamination, is provided at the upper end of the thirteenth magnetic air gap (41). The inner end of the twenty-fifth rectangular slot is connected to the right end of the thirteenth magnetic air gap (41). The upper end of the 25th rectangular slot is connected to the 13th magnetic gap (41), and the length of the 25th rectangular slot is equal to the length of the 13th magnetic gap (41). The left end of the 25th rectangular slot is on the same straight line as the left end of the 13th magnetic gap (41). The upper end of the 25th rectangular slot is provided with a 17th rectangular slot that penetrates the thickness of the rotor lamination and is parallel to the center line of the second S magnetic pole. The outer end of the 17th rectangular slot is not connected to the outer circle of the rotor lamination. The inner end of the 17th rectangular slot is connected to the upper end of the 24th rectangular slot, and the width of the 17th rectangular slot is greater than the length of the 24th rectangular slot. The right end of the 16th rectangular slot is provided with a 26th rectangular slot that penetrates the thickness of the rotor lamination. The left end of the 26th rectangular slot is connected to the right end of the 16th rectangular slot, and the length of the 26th rectangular slot is less than the width of the 16th rectangular slot.A fourteenth magnetic air gap (42) penetrating the thickness of the rotor lamination is provided at the right end of the twenty-sixth rectangular slot. The right end of the twenty-sixth rectangular slot is connected to the left end of the fourteenth magnetic air gap (42), and the length of the twenty-sixth rectangular slot is equal to the width of the fourteenth magnetic air gap (42). A twenty-seventh rectangular slot penetrating the thickness of the rotor lamination is provided at the upper end of the fourteenth magnetic air gap (42). The inner end of the twenty-seventh rectangular slot is connected to the upper end of the fourteenth magnetic air gap (42), and the length of the twenty-seventh rectangular slot is equal to the length of the fourteenth magnetic air gap (42). The right end of the twenty-seventh rectangular slot is connected to the left end of the fourteenth magnetic air gap (42). On the right end, on the same straight line, an eighteenth rectangular slot is provided above the twenty-seventh rectangular slot, penetrating the thickness of the rotor lamination and parallel to the center line of the second S magnetic pole. The outer end of the eighteenth rectangular slot is not connected to the outer circle of the rotor lamination, and the inner end of the eighteenth rectangular slot is connected to the upper end of the twenty-seventh rectangular slot. The width of the eighteenth rectangular slot is greater than the length of the twenty-seventh rectangular slot. Near the outer circle of the rotor lamination and between the eleventh magnetic gap (39) and the seventeenth rectangular slot, a nineteenth rectangular slot is provided, penetrating the thickness of the rotor lamination. The outer end of the nineteenth rectangular slot is connected to the outer circle of the rotor lamination, the outer end of the eleventh magnetic gap (39), and the outer end of the eleventh magnetic gap (39). The outer ends of the seventeenth rectangular slot are not connected. The inner end of the nineteenth rectangular slot is provided with a fifteenth magnetic air gap (43) that penetrates the thickness of the rotor lamination. The outer end of the fifteenth magnetic air gap (43) is connected to the inner end of the nineteenth rectangular slot, and the width of the fifteenth magnetic air gap (43) is smaller than the width of the nineteenth rectangular slot. The inner end of the fifteenth magnetic air gap (43) extends inward to the left side of the center line of the second S magnetic pole. Near the outer circle of the rotor lamination and between the twelfth magnetic air gap (40) and the eighteenth rectangular slot, there is a sixteenth magnetic air gap (44) that penetrates the thickness of the rotor lamination. The outer end of the sixteenth magnetic air gap (44) The outer circle of the rotor lamination, the outer end of the twelfth magnetic air gap (40), and the outer end of the eighteenth rectangular slot are not connected. A twentieth rectangular slot, tangential in structure, is provided between the inner end of the sixteenth magnetic air gap (44) and the center line of the second S magnetic pole, penetrating the thickness of the rotor lamination. The right end of the twentieth rectangular slot is connected to the inner end of the sixteenth magnetic air gap (44), and the width of the twentieth rectangular slot is greater than the width of the sixteenth magnetic air gap (44). The left end of the twentieth rectangular slot is not connected to the inner end of the fifteenth magnetic air gap (43). The lower end of the twentieth rectangular slot is on the same straight line as the lowest end of the inner end of the fifteenth magnetic air gap (43). 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 (6) is installed in the first rectangular slot with the right side polarity of the first rectangular ferrite permanent magnet (6) being the N pole. The second rectangular ferrite permanent magnet (9) is installed in the second rectangular slot with the upper side polarity of the second rectangular ferrite permanent magnet (9) being the N pole. The third rectangular ferrite permanent magnet (16) is installed in the third rectangular slot with the left side polarity of the third rectangular ferrite permanent magnet (16) being the N pole. The fourth rectangular ferrite permanent magnet (17) is installed in the fourth rectangular slot with the upper side polarity of the fourth rectangular ferrite permanent magnet (17) being the N pole. Inside, the first rectangular NdFeB permanent magnet (18) is installed in the fifth rectangular slot with the right side of the first rectangular NdFeB permanent magnet (18) having the N pole polarity. The second rectangular NdFeB permanent magnet (19) is installed in the sixth rectangular slot with the upper side of the second rectangular NdFeB permanent magnet (19) having the N pole polarity. The third rectangular NdFeB permanent magnet (7) is installed in the seventh rectangular slot with the left side of the third rectangular NdFeB permanent magnet (7) having the N pole polarity, forming the first N pole of the permanent magnet rotor. The fourth rectangular NdFeB permanent magnet (8) is installed in the eighth rectangular slot with the right side of the fourth rectangular NdFeB permanent magnet (8) having the S pole polarity. The fifth rectangular NdFeB permanent magnet (20) is installed in the fifth rectangular NdFeB permanent magnet (20) with the right side of the fifth rectangular NdFeB permanent magnet (20) having the S pole polarity. 20) Install the sixth rectangular NdFeB permanent magnet (21) with the left side polarity as S pole in the ninth rectangular slot. Install the sixth rectangular NdFeB permanent magnet (21) with the right side polarity as S pole in the tenth rectangular slot. Install two identical eleventh rectangular NdFeB permanent magnets (22) with opposite sides polarity as S pole in the two eleventh rectangular slots forming a "V" shape to form the first S pole of the permanent magnet rotor. Install the fifth rectangular ferrite permanent magnet (23) with the right side polarity as N pole in the twelfth rectangular slot. Install the sixth rectangular ferrite permanent magnet (24) with the sixth rectangular ferrite permanent magnet (24) as the sixth rectangular ferrite permanent magnet (24) The N-pole magnets are installed in the thirteenth rectangular slot with the left side polarity as N. The eighth rectangular NdFeB permanent magnet (25) is installed in the twenty-first rectangular slot with the right side polarity as N. The semi-circular NdFeB permanent magnet (11) is installed in the semi-circular slot with the inner arc surface polarity as N, forming the second N pole of the permanent magnet rotor. The ninth rectangular NdFeB permanent magnet (12) is installed in the fourteenth rectangular slot with the right side polarity as S. The tenth rectangular NdFeB permanent magnet (26) is installed in the fifteenth rectangular slot with the left side polarity as S.The eleventh rectangular NdFeB permanent magnet (14) is installed in the sixteenth rectangular slot with the polarity of its upper side being S-pole. The twelfth rectangular NdFeB permanent magnet (15) is installed in the seventeenth rectangular slot with the polarity of its right side being S-pole. The thirteenth rectangular NdFeB permanent magnet (27) is installed in the eighteenth rectangular slot with the polarity of its left side being S-pole. The fourteenth rectangular NdFeB permanent magnet (28) is installed in the nineteenth rectangular slot with its right side polarity as the S pole. The fifteenth rectangular NdFeB permanent magnet (13) is installed in the twentieth rectangular slot with a tangential structure, with its upper side polarity as the S pole, forming the second S pole of the permanent magnet rotor. This process is repeated to form a combined permanent magnet rotor with NdFeB permanent magnets and ferrite permanent magnets synergistically excited by alternating N and S poles.

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