Composite magnetic circuit motor

Abstract

The utility model provides a composite magnetic circuit motor. In order to solve the problem that the overall working efficiency of a current motor is difficult to improve, a conductive and magnetic metal thin strip is adopted as a winding wire, and after the winding wire is wound on a stator, the conductive requirement of a winding can be met, and meanwhile, the winding wire can be compounded with stator teeth and stator yoke magnetic circuits; and the sizes of the equivalent stator teeth and the stator yoke are increased compared with the original sizes, so that the iron loss is reduced, and the overall working efficiency of the motor is improved.

Description

Technical Field

[0001] The utility model relates to the field of motors, in particular to a composite magnetic circuit motor. Background Art

[0002] For equipment driven by motors, the performance of the motor is related to the overall energy saving of the equipment. When designing motor laminations, under the same motor structure, in order to reduce copper loss, the area of ​​the stator slot needs to be increased, but the magnetic circuit of the stator teeth and yoke becomes narrower, the magnetic density increases, and the iron loss also increases. The total loss of the motor needs to be determined based on the sum of iron loss and copper loss, but the efficiency is relatively low when applied to small torque direction motors; when designing motor laminations, under the same motor structure, in order to reduce iron loss, the size of the stator teeth and yoke is widened, but it will lead to a decrease in the stator slot area, a decrease in winding usage, and an increase in copper loss. When applied to large torque direction motors, the efficiency is relatively low.

[0003] If the copper loss is higher than the iron loss at the rated operating point, the motor silicon steel material grade is increased while increasing the stator slot area, and the iron loss is kept basically unchanged, thereby increasing the overall efficiency of the motor. However, if the motor has already adopted the highest silicon steel grade, this design measure cannot increase the overall efficiency of the motor. If the iron loss is higher than the copper loss, the rotor magnetic steel grade is increased or copper enameled wire is used while increasing the width of the stator teeth and yoke, and the copper loss is kept basically unchanged, thereby increasing the overall efficiency of the motor. However, if the motor has already adopted high-grade magnetic steel or copper enameled wire, the overall efficiency of the motor cannot be increased. The contribution to improving the motor efficiency by adjusting the size of the stator slot and the tooth yoke is small. For motors applied to multiple rated operating points, the method of only ensuring the performance of a single operating point is not compatible with other operating points, resulting in the motor application scenario being difficult to meet the needs. Utility Model Content

[0004] The purpose of the utility model is to provide a composite magnetic circuit motor in response to the defects of the prior art. The motor adopts a metal thin strip with electrical conductivity and magnetic conductivity as the winding wire. After being wound around the stator, it can meet the conductivity requirements of the winding and can be composited with the stator teeth and stator yoke magnetic circuits, so that the size of the equivalent stator teeth and stator yoke is larger than the original size, so as to reduce iron loss and improve the overall working efficiency of the motor.

[0005] In order to achieve the above purpose, the following technical solutions are adopted:

[0006] A composite magnetic circuit motor, comprising:

[0007] The stator comprises a stator yoke and stator teeth, wherein a plurality of stator teeth are distributed in the inner ring of the stator yoke in the circumferential direction, and stator slots are formed between adjacent stator teeth in the circumferential direction of the stator yoke. A metal strip is wound around the stator teeth to form a winding, and the winding is distributed in the stator slots. The winding formed by the metal strip can conduct electricity and magnetism.

[0008] The rotor is located inside the stator and rotates relative to the stator with an air gap between it and the stator teeth.

[0009] Furthermore, along the stator axis, an insulating frame is provided on the outside of the stator teeth and the stator yoke, and the winding is wound on the insulating frame corresponding to the stator teeth. Wire grooves are left on the insulating frame against which the end faces of the stator teeth abut. A lead wire is connected to one end of the metal strip inside the winding, and the lead wire is led out of the winding through the wire groove.

[0010] Furthermore, wire grooves are respectively provided on the insulating frame against which the end surfaces of both ends of the stator teeth abut.

[0011] Furthermore, the wire slots extend radially upward along the stator to an insulating frame abutting against the stator yoke.

[0012] Furthermore, the stator slots are located on both sides of the stator teeth, and the stator slot portions close to the stator teeth for accommodating the windings are winding slots, and the winding slots are in a concave shape.

[0013] Furthermore, of the two side surfaces of the winding groove, a first side surface close to the air gap is parallel to a second side surface close to the magnetic yoke, and a bottom surface of the winding groove is perpendicular to the side surfaces of the winding groove.

[0014] Furthermore, one side of the metal strip is in contact with the first side surface of the winding groove, and the other side is in contact with the second side surface of the winding groove. After the metal strip forms a winding, the width is the same as the depth of the winding groove.

[0015] Furthermore, the metal strip is wound around the stator teeth in multiple turns, the metal strip is made of iron, and both sides of the metal strip are coated with an insulating layer.

[0016] Furthermore, the winding ends of the stator are connected to different windings through leads.

[0017] Furthermore, the ratio of the area of ​​the stator teeth to the area of ​​the stator slots is 1 / 4 to 1 / 6.

[0018] Compared with the prior art, the utility model has the following advantages and positive effects:

[0019] 1. In view of the problem that the overall working efficiency of the motor is difficult to improve, a thin metal strip with electrical conductivity and magnetic conductivity is used as the winding wire. After being wound around the stator, it can meet the conductive requirements of the winding and can be combined with the stator teeth and stator yoke magnetic circuits, so that the size of the equivalent stator teeth and stator yoke is larger than the original size, so as to reduce iron loss and improve the overall working efficiency of the motor.

[0020] 2. The width of the metal strip is equal to the width between the two sides of the winding slot of the stator slot, so that the metal strip can densely fill the winding slot after winding, increase the slot fill rate, thereby reducing copper loss and improving the working efficiency of the motor.

[0021] 3. The first side surface and the second side surface of the winding groove are parallel and perpendicular to the bottom of the winding groove, which is convenient for winding and limiting the metal strip, reducing the magnetic resistance of the winding magnetic circuit, and improving the winding processability, facilitating the winding operation of the winding.

[0022] 4. Improve motor efficiency, increase slot area, and further reduce copper loss. Since the metal strip used in the winding will also conduct magnetism and combine with the magnetic circuit of the stator teeth and stator yoke, the size of the equivalent stator teeth and stator yoke will increase compared with the original size. Therefore, the iron loss will also be reduced year-on-year, and the overall motor efficiency will be improved at the rated point.

[0023] 5. It has good adaptability to the application environment of multiple working points. Compared with the conventional scheme, the efficiency of the utility model at multiple rated points is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0025] Figure 1 It is a schematic end view of the composite magnetic circuit motor in the embodiment of the utility model.

[0026] Figure 2 It is a schematic diagram of the end face of the stator in the embodiment of the utility model.

[0027] Figure 3 This is a schematic diagram of the distribution of wire slots on the stator in an embodiment of the utility model.

[0028] Figure 4 It is a schematic diagram of the winding of the metal strip in the embodiment of the utility model.

[0029] In the figure, 1. rotor, 2. winding, 3. stator yoke, 4. stator, 5. stator slot, 6. air gap, 7. stator teeth, 8. first side, 9. second side, 10. winding slot, 11. wire slot, 12. metal strip, 13. insulation frame. DETAILED DESCRIPTION

[0030] In a typical implementation of the present invention, Figure 1-Figure 4 As shown, a composite magnetic circuit motor is proposed.

[0031] The current magnetic circuit motor uses the highest silicon steel grade, magnetic steel grade and copper enameled wire, but the contribution to improving the motor efficiency by adjusting the size of the stator slot 5 and the tooth yoke is relatively small. Based on this, a composite magnetic circuit motor is provided in this embodiment, which uses a metal strip 12 with conductive and magnetic properties as the winding 2 wire. Compared with traditional enameled wire, it can be magnetically composited with the stator teeth 7 and the stator yoke 3, so that the size of the equivalent stator teeth 7 and the stator yoke 3 is larger than the original size, so as to reduce iron loss and improve the overall working efficiency of the motor.

[0032] See also Figure 1 In this embodiment, a composite magnetic circuit motor includes a stator 4 and a rotor 1 that match each other. The rotor 1 is located in the inner ring of the stator 4, rotates relative to the stator 4, and leaves an air gap 6 between the rotor 1 and the stator teeth 7. The stator 4 includes a stator yoke 3 and stator teeth 7. A metal strip 12 with electrical conductivity and magnetic conductivity is used as the wire material of the winding 2. The metal strip 12 not only has the electrical conductivity required by the traditional winding 2, but also has magnetic conductivity and can participate in the magnetic circuit of the motor. The metal strip 12 is wound around the stator teeth 7 to form a winding 2. The winding 2 not only serves as a carrier of current, but also becomes a part of the magnetic circuit, and is composited with the magnetic circuit of the stator teeth 7 and the stator yoke 3.

[0033] Specifically, Figure 2 As shown, the stator 4 includes a stator yoke 3 and a plurality of stator teeth 7 distributed in the circumferential direction, and stator slots 5 are formed between adjacent stator teeth 7. After the metal strip 12 winding 2 is wound around the stator teeth 7, it is distributed in the stator slots 5 to ensure the compactness of the structure and the stability of the winding 2. By introducing the metal strip 12, the equivalent size of the stator teeth 7 and the stator yoke 3 is increased in the magnetic circuit. The metal strip 12 not only participates in the magnetic circuit itself, but also enhances the magnetic effect of the stator teeth 7 and the stator yoke 3 through its electrical conductivity and magnetic conductivity.

[0034] In a conventional motor, the iron loss of the stator teeth 7 and the stator yoke 3 is an important source of energy loss. In this embodiment, under the inconvenience of the existing structure, a metal thin strip 12 of a dual-conductive material that is both conductive and magnetic is used to replace the original enameled wire, thereby increasing the size of the equivalent magnetic circuit, reducing the magnetic flux density, thereby reducing the iron loss and improving the efficiency of the motor.

[0035] The stator teeth 7 and the stator yoke 3 are covered with an insulating frame 13, and the winding 2 is wound on the insulating frame 13 corresponding to the stator teeth 7. The traditional winding 2 lead-out method needs to occupy additional space or lead to a complex structure. In this embodiment, Figure 1and Figure 3 As shown, along the axial direction of the stator 4, a wire slot 11 is left on the insulating frame 13 area where the end surface of the stator tooth 7 abuts, and a lead wire is connected to one end of the metal strip 12 located inside the winding 2, and the lead wire is led out of the winding 2 through the wire slot 11. The wire slot 11 provides a compact and orderly lead-out method, and the wire slot 11 can also provide a certain insulation and protection effect to prevent the lead wire from directly contacting other components and causing short circuit or damage. The space occupied by the lead-out of the winding 2 is reduced, making the overall structure of the motor more compact.

[0036] A wire slot 11 is provided on the insulating frame 13 region where the end face of each stator tooth 7 of the stator 4 abuts. The wire slots 11 are distributed on the insulating frame 13 regions corresponding to the two ends of the stator teeth 7. The insulating frame 13 where the end faces of the two ends of the stator teeth 7 abut is provided with wire slots. The design of multiple wire slots 11 makes the lead-out of the winding 2 more flexible and convenient for later maintenance and overhaul. The wire slots 11 are not only provided on the stator teeth 7, but also extend radially to the stator yoke 3 region, that is, the wire slots 11 extend radially along the stator 4 to the insulating frame 13 where the stator yoke 3 abuts. A longer path is provided for the lead arrangement, so that the lead can be led out of the winding 2 to facilitate the establishment of a connection with other windings 2. The flexibility and insulation performance of the lead are enhanced.

[0037] like Figure 2 As shown, the stator slot 5 is located on both sides of the stator teeth 7, and the part of the stator slot 5 near the stator teeth 7 to accommodate the winding 2 is a winding slot 10, which is in a concave shape. The winding slot 10 is adapted to the shape of the winding 2 formed by winding the metal strip 12. Among the two sides of the winding slot 10, the first side 8 close to the air gap 6 is parallel to the second side 9 close to the yoke, and the bottom surface of the winding slot 10 is perpendicular to the side of the winding slot 10. The concave design can better fix the metal strip 12 to prevent it from loosening or shifting during operation. The space utilization of the stator slot 5 is improved, so that the winding 2 can be arranged more closely.

[0038] One side of the metal strip 12 is in contact with the first side surface 8 of the winding groove 10 , and the other side is in contact with the second side surface 9 of the winding groove 10 . After the metal strip 12 forms the winding 2 , the thickness is the same as the depth of the winding groove 10 .

[0039] The metal strip 12 may be a strip made of an iron alloy, i.e., an iron strip, and the iron alloy may be an alloy of iron, cobalt, and nickel. Figure 4 As shown, the width of the metal strip 12 is equal to the width between the two sides of the winding slot 10 of the stator slot 5, so that the metal strip 12 can densely fill the winding slot 10 after winding, increase the slot fill rate, thereby reducing copper loss and improving the working efficiency of the motor. The metal strip 12 can be a thin strip with a thickness of less than 0.25 mm.

[0040] like Figure 4As shown, both sides of the metal strip 12 are coated with an insulating layer and are wound multiple turns on the stator teeth 7. The insulating layer prevents short circuits between the metal strips 12, thereby improving the safety of the motor. Multiple turns of winding increase the number of turns of the winding 2, thereby improving the electromagnetic performance of the motor.

[0041] In this embodiment, the area ratio of the stator teeth 7 to the stator slots 5 is set to 1 / 4 to 1 / 6. By adjusting the area ratio, the magnetic circuit and electrical performance of the motor can be optimized to achieve better operating results.

[0042] The use of metal strip 12 as the wire material of winding 2 enables winding 2 to fit closely on stator teeth 7, reducing the volume and weight of winding 2. Under the premise of ensuring the mechanical strength of the motor tooth yoke, compared with the traditional 1 / 2 area ratio of stator teeth 7 to stator slots 5, the area of ​​stator slots 5 is increased in this embodiment, iron loss is also reduced year-on-year, and it is conducive to the overall compact design of the motor. Due to the combined effect of winding 2 and magnetic circuit, the electromagnetic performance of the motor is improved.

[0043] During the operation of a conventional motor, the magnetic field is emitted through the rotor 1 magnetic steel, passes through the stator teeth 7, the stator yoke 3, and the other stator teeth 7, and then returns to the other polarity magnetic steel to form a magnetic circuit, and so on. In this embodiment, in addition to the above magnetic circuit, after the magnetic field reaches the stator teeth 7, a part of the magnetic field passes through the first side 8 and reaches the second side 9 through the magnetic conductivity of the winding 2, and then reaches the winding 2 of another stator tooth 7 through the stator yoke 3, and finally returns to the other polarity magnetic steel of the rotor 1 through the stator teeth 7, forming another magnetic circuit, thereby forming a composite magnetic circuit structure that meets the magnetic circuit motor in this embodiment.

[0044] The utility model has good adaptability to application environments with multiple working points. Compared with conventional solutions, the utility model has improved efficiency at multiple rated points.

[0045] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A composite magnetic circuit motor, characterized in that: include: The stator comprises a stator yoke and stator teeth, wherein a plurality of stator teeth are distributed in the inner ring of the stator yoke in the circumferential direction, and stator slots are formed between adjacent stator teeth in the circumferential direction of the stator yoke. A metal strip is wound around the stator teeth to form a winding, and the winding is distributed in the stator slots. The winding formed by the metal strip can conduct electricity and magnetism. The rotor is located inside the stator and rotates relative to the stator with an air gap between it and the stator teeth.

2. The composite magnetic circuit motor according to claim 1, characterized in that: Along the stator axis, the stator teeth and the stator yoke are covered with an insulating frame, the winding is wound on the insulating frame corresponding to the stator teeth, and wire grooves are left on the insulating frame abutting the end faces of the stator teeth. One end of the metal strip inside the winding is connected to a lead wire, and the lead wire is led out of the winding through the wire groove.

3. The composite magnetic circuit motor according to claim 2, characterized in that: Wire grooves are respectively provided on the insulating frame to which the end surfaces of both ends of the stator teeth abut.

4. The composite magnetic circuit motor according to claim 2 or 3, characterized in that: The wire slots extend radially upward along the stator to an insulating frame abutting against the stator yoke.

5. The composite magnetic circuit motor according to claim 1, characterized in that: The stator slots are located on both sides of the stator teeth, and the stator slot parts close to the stator teeth for accommodating the windings are winding slots, which are in a concave shape.

6. The composite magnetic circuit motor according to claim 5, characterized in that: Of the two side surfaces of the winding groove, a first side surface close to the air gap is parallel to a second side surface close to the magnetic yoke, and a bottom surface of the winding groove is perpendicular to the side surfaces of the winding groove.

7. The composite magnetic circuit motor according to claim 6, characterized in that: One side of the metal strip is in contact with the first side surface of the winding groove, and the other side is in contact with the second side surface of the winding groove. After the metal strip forms a winding, its width is the same as the depth of the winding groove.

8. The composite magnetic circuit motor according to any one of claims 1 to 7, characterized in that: The metal strip is wound around the stator teeth with multiple turns. The metal strip is made of iron and both sides of the metal strip are coated with an insulating layer.

9. The composite magnetic circuit motor according to claim 8, characterized in that: The winding ends of the stator are connected to different windings through lead wires.

10. The composite magnetic circuit motor according to claim 1, characterized in that: The ratio of the area of ​​the stator teeth to the area of ​​the stator slots is 1 / 4 to 1 / 6.

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