CN111884373A - Claw pole, permanent magnet motor and mounting method of rotor assembly of permanent magnet motor - Google Patents

Abstract

The invention discloses a claw pole, a permanent magnet motor and a mounting method of a rotor assembly of the permanent magnet motor, wherein the claw pole comprises a magnet yoke part and a plurality of claw-shaped magnetic poles; the claw-shaped magnetic poles are uniformly arranged along the circumferential direction of the axis of the magnetic yoke part; the claw-shaped magnetic pole is connected with the magnetic yoke part through a connecting part; the left side surface and the right side surface of the claw-shaped magnetic pole are provided with the same groove edges; when the two claw poles are installed in a matched mode, a permanent magnet installation groove is formed between the side faces of the two adjacent claw-shaped magnetic poles. The claw pole is convenient for installing the permanent magnet by arranging the groove edge, can ensure the stability of the permanent magnet and is not easy to fall off. The embodiment of the invention further obtains reasonable installation size data by optimizing the width, the thickness and the length of the groove of the claw pole, and the claw pole is integrally cast or forged; a reliable installation step of a permanent magnet motor is adopted; the installation size, the reasonability and the manufacturability in the installation process can improve the stability and the service life of the motor, and expand the application range and the service life cycle of the motor.

Description

Claw pole, permanent magnet motor and mounting method of rotor assembly of permanent magnet motor

Technical Field

The invention relates to the technical field of motors, in particular to a claw pole and permanent magnet motor and a mounting method of a rotor assembly of the claw pole and permanent magnet motor.

Background

At present, a claw pole is one of core components of a claw pole motor, and the claw pole structure is relatively simple; as a part of the rotor core, in order to increase the magnetic flux of the motor and increase the output power of the motor, one method is to arrange permanent magnets between front and rear claw-shaped magnetic poles. The magnetic flux leakage is prevented, a reverse magnetic field is provided, the magnetic flux passing through the armature winding of the motor can be effectively improved, and the output power of the motor is improved; the permanent magnet installation groove between the two claw-shaped magnetic poles is used for positioning the permanent magnet blocks, and a positioning part is usually additionally arranged.

However, because the rotating speed range of the motor is wide, the stability, reliability and service life of the motor are directly influenced by the installation size, rationality and manufacturability of the production process, and the use range and service life cycle of the motor are severely limited by unreasonable installation size data and the production process.

Disclosure of Invention

In view of the above, the present invention provides a claw pole and a permanent magnet motor and a method for mounting a rotor assembly thereof, which at least solve some of the above technical problems.

In a first aspect, embodiments of the present invention provide a claw pole, comprising a yoke portion and a plurality of claw-shaped magnetic poles;

the claw-shaped magnetic poles are uniformly arranged along the circumferential direction of the axis of the magnetic yoke part; the claw-shaped magnetic pole is connected with the magnetic yoke part through a connecting part;

the left side surface and the right side surface of the claw-shaped magnetic pole are provided with the same groove edges; when the two claw poles are installed in a matching mode, a permanent magnet installation groove is formed between the side faces of the two adjacent claw-shaped magnetic poles; the width W of the groove edge is 0.5-6 mm.

Further, the thickness H of the groove edge is 0.5-5 mm.

Further, the cross section of the outer side surface of the claw-shaped magnetic pole is formed by a rectangle and an isosceles trapezoid; the length L of the groove edge is the same as the length of the waist of the isosceles trapezoid.

Furthermore, the assembly gap between the permanent magnet installation groove and the permanent magnet is 0.02-4 mm.

Further, the yoke portion, the plurality of claw-shaped magnetic poles, and the connecting portion are integrally cast or forged.

Furthermore, a magnet exciting wire slot is arranged on the magnet yoke part; the excitation wire slots are uniformly distributed on the circumference of the yoke part; the bottom of the excitation wire slot is a concave curved surface, and the radius of the concave curved surface is R1.

Further, two adjacent connecting parts are in circular arc transition.

In a second aspect, an embodiment of the present invention provides a permanent magnet motor, which sequentially includes, from inside to outside: the rotor comprises a rotor shaft, an excitation winding, claw pole parts, an armature winding and an armature core;

the claw pole part comprises a front claw pole and a rear claw pole which are installed in a buckled mode; the front claw pole and the rear claw pole are claw poles as in any one embodiment;

and after the front claw pole and the rear claw pole are buckled, a permanent magnet mounting groove is formed between the adjacent claw-shaped magnetic poles and is used for mounting a permanent magnet.

In a third aspect, an embodiment of the present invention further provides an installation method of a permanent magnet motor rotor assembly, including:

step (1), pores are arranged on the side wall of the excitation framework, a high-temperature adhesive is coated on an enameled wire in the excitation framework through the pores arranged on the side wall of the excitation framework, and excitation windings are placed in the front claw pole and the rear claw pole;

step (2) pressing a rotor shaft into the shaft holes of the front claw pole and the rear claw pole, and mounting a slip ring;

connecting the slip ring with a lead of an excitation winding, packaging the lead of the excitation winding in an excitation wire slot by using an adhesive, and correcting a permanent magnet mounting groove between the front claw pole and the rear claw pole by using a milling cutter after the adhesive is dried;

step (4) finely turning and processing the excircle, the shaft and the slip ring of the rotor; coating a high-temperature-resistant adhesive in the permanent magnet or the permanent magnet mounting groove, and mounting the permanent magnet;

welding fans at two ends of the rotor, dynamically balancing the rotor, preheating, dipping paint and baking the rotor;

and (6) removing redundant paint marks after paint dipping, performing dynamic balance, spraying antirust paint and antirust oil, and warehousing for packaging.

The claw pole provided by the embodiment of the invention comprises a magnetic yoke part and a plurality of claw-shaped magnetic poles; the claw-shaped magnetic poles are uniformly arranged along the circumferential direction of the axis of the magnetic yoke part; the claw-shaped magnetic pole is connected with the magnetic yoke part through a connecting part; the left side surface and the right side surface of the claw-shaped magnetic pole are provided with the same groove edges; the width W of the groove edge is 0.5-6 mm; when the two claw poles are installed in a matched mode, a permanent magnet installation groove is formed between the side faces of the two adjacent claw-shaped magnetic poles. The claw pole is convenient for installing the permanent magnet by arranging the groove edge and the width thereof, can ensure the stability of the permanent magnet and is not easy to fall off.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural diagram of a 6-claw pole provided by an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the left side view of the structure of FIG. 1 taken along line A-A;

FIG. 3 is a schematic perspective view of a claw pole according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an 8-claw pole provided by an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of the left side view structure of FIG. 4 taken along line B-B;

fig. 6 is a schematic cross-sectional view of a permanent magnet motor according to an embodiment of the present invention;

FIG. 7 is a schematic view of the front and rear claw pole mounting provided by an embodiment of the present invention;

fig. 8 is a schematic diagram of an excitation skeleton structure.

In the drawings: 1-a yoke portion; 2-claw-shaped magnetic poles; 3-a connecting part; 21-left and right side; 22-groove edge; 23-lateral side; 11-excitation wire slot; 12-arc; 51-a rotor shaft; 52-excitation winding; 53-claw pole part; 54-armature winding; 55-armature core; 531-front claw pole; 532-rear claw pole; 56-permanent magnet.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

Example 1:

referring to fig. 1, a claw pole according to an embodiment of the present invention includes a yoke portion 1 and a plurality of claw-shaped magnetic poles 2; as shown, the number is 6; the 6 claw-shaped magnetic poles are uniformly arranged along the axial direction of the magnetic yoke part 1, and the claw-shaped magnetic poles 2 are connected with the magnetic yoke part 1 through the connecting parts 3; the left and right side surfaces 21 of the claw-shaped magnetic pole 2 are provided with the same groove edges 22; when the two claw poles are installed in a matching mode, a permanent magnet installation groove is formed between the side faces of the two adjacent claw-shaped magnetic poles 2. The permanent magnet mounting groove is used for mounting a permanent magnet, and the stability of the permanent magnet can be ensured. When the rotor provided with the claw pole rotates at a high speed, the permanent magnet is ensured not to be loosened.

As shown in fig. 1-2, the groove may be 0.5-6 mm in width W, and 1-3 mm may be preferably used, and more preferably 1.25-2.5 mm. When the width of the groove edge is less than 0.5 mm, the contact surface with the permanent magnet is too small, and the permanent magnet is easy to fall off; when the two claw poles are assembled as the front and rear claw poles, if the distance between the groove edge parts of the claw pole N and the claw pole S is too small, the magnetic flux leakage is serious.

The grooves have a thickness of 0.5 to 5mm, preferably 1.5 to 4 mm, more preferably 2 to 3.5mm, can be used. When the thickness of the groove edge is less than 0.5 mm, the mechanical strength is insufficient, and the permanent magnet is easy to fall off; when the two claw poles are assembled as the front and rear claw poles, and the distance between the two claw poles is larger than 5mm, the available space is limited, the installation of the permanent magnet is influenced, the contact surface between the permanent magnet and the claw poles is insufficient, and the using effect is influenced.

After the width and the thickness of the groove are optimized according to the parameters, the width of the permanent magnet to be installed is slightly smaller than that of the permanent magnet installation groove; the assembly clearance between the permanent magnet and the permanent magnet mounting groove is ensured to be between 0.02 and 4 mm, preferably between 0.1 and 1 mm, and more preferably between 0.2 and 0.5 mm. When the assembling clearance is too small, the assembling is difficult, and when the assembling clearance is too large, the magnetic resistance is larger, so that the performance is influenced.

Referring to fig. 3, the cross section of the outer side surface 23 of the claw-shaped magnetic pole 2 is formed by a rectangle and an isosceles trapezoid; the length L of the groove edge is the same as the length of the waist of the isosceles trapezoid. The groove edge 22 makes an angle of approximately 90 with the side 21 of the claw pole 2. The yoke portion 1, the plurality of claw-shaped magnetic poles 2, and the connecting portion 3 are integrally cast or forged.

Through the optimization of the width, the thickness and the length of the groove and the integral casting or forging molding, the claw pole can be ensured to have enough strength to resist the centrifugal force of the permanent magnet in the high-speed rotation of the rotor and ensure that the permanent magnet is not loosened when the motor rotor rotates at high speed by the magnetic force of the permanent magnet.

In addition, in order to further facilitate the installation of the permanent magnet, in the assembling process, the consistency of the sizes of all permanent magnet installation grooves formed after the front claw pole and the rear claw pole are assembled is ensured, and the automatic installation is facilitated, and the excitation wire grooves 11 are arranged on the magnetic yoke part 1; the excitation wire slots 11 are uniformly distributed on the circumference of the yoke part 1; the bottom of the excitation wire slot 11 is a concave curved surface, and the radius of the concave curved surface is R1. Two adjacent connecting parts are transited through an arc 12; the radius of arc 12 is R2. After the press mounting is completed, the exciting winding wire is connected with the slip ring through the exciting wire groove, and the wire is packaged in the exciting wire groove by using an adhesive, so that the wire is effectively prevented from being broken when the motor is excited to change speed, and meanwhile, the fan is convenient to weld and install in the later period.

Specifically, the 6-claw pole shown in fig. 1-2 is taken as an example, wherein the outer side surface 23 of the claw-shaped magnetic pole 2 is 106mm in circular diameter; the diameter of a shaft hole in the middle of the magnetic yoke part 1 is 20 mm; the diameter of the magnetic yoke part 1 is 52 mm; the thickness of the connecting part is 13.5 mm; the thickness from the bottom surface to the top surface (including the thickness of the connecting part) of the claw-shaped magnetic pole is 50 mm; the width of the groove edge is 6mm, the thickness of the groove edge is 5mm, and the permanent magnet is 4 mm smaller than the permanent magnet mounting groove.

Example 2:

the 8-claw pole provided by the embodiment of the invention is different from the 8-claw pole provided by the embodiment 1 in that: referring to fig. 4-5, the outer side 23 of the claw pole 2 is circular with a diameter of 126 mm; the diameter of a shaft hole in the middle of the magnetic yoke part 1 is 26 mm; the diameter of the magnetic yoke part 1 is 60 mm; the thickness of the connecting part is 15 mm; the thickness from the bottom surface to the top surface (including the thickness of the connecting part) of the claw-shaped magnetic pole is 53.5 mm; the width of the groove edge is 2.5 mm, the thickness of the groove edge is 3 mm, and the permanent magnet is 0.2 mm smaller than the permanent magnet installation groove.

Example 3:

an embodiment of the present invention further provides a permanent magnet motor, as shown in fig. 6, which sequentially includes, from inside to outside: a rotor shaft 51, an excitation winding 52, a claw pole portion 53, an armature winding 54, and an armature core 55; wherein, the claw pole part comprises a front claw pole and a rear claw pole which are buckled and installed; the front and rear claw poles are claw poles as in the above example 1 or 2;

after the front claw pole and the rear claw pole are fastened, referring to fig. 7, a permanent magnet installation groove is formed between adjacent claw-shaped magnetic poles for installing a permanent magnet. Reasonable installation size data is obtained by optimizing the width, the thickness and the length of the groove of the claw pole, and the claw pole is integrally cast or forged to form, so that the claw pole has enough strength, and can resist the centrifugal force of the permanent magnet in high-speed rotation of the rotor after assembly and ensure that the permanent magnet is not loosened when the motor rotor rotates at high speed. The magnetic flux passing through the armature winding of the motor can be effectively improved, and the output power of the motor is improved. Meanwhile, the motor is convenient to install, the service life of the rotor is prolonged, and further, the stability, the reliability and the service life of the motor are improved.

Example 4:

the embodiment of the invention also provides an installation method of the permanent magnet motor rotor assembly, which comprises the following steps:

step (1), pores are arranged on the side wall of the excitation framework, a high-temperature adhesive is coated on an enameled wire in the excitation framework through the pores arranged on the side wall of the excitation framework, and excitation windings are placed in the front claw pole and the rear claw pole;

step (2) pressing a rotor shaft into the shaft holes of the front claw pole and the rear claw pole, and mounting a slip ring;

connecting the slip ring with a lead of an excitation winding, packaging the lead of the excitation winding in an excitation wire slot by using an adhesive, and correcting a permanent magnet mounting groove between the front claw pole and the rear claw pole by using a milling cutter after the adhesive is dried;

step (4) finely turning and processing the excircle, the shaft and the slip ring of the rotor; coating a high-temperature-resistant adhesive in the permanent magnet or the permanent magnet mounting groove, and mounting the permanent magnet;

welding fans at two ends of the rotor, dynamically balancing the rotor, preheating, dipping paint and baking the rotor;

and (6) removing redundant paint marks after paint dipping, performing dynamic balance, spraying antirust paint and antirust oil, and warehousing for packaging.

Wherein the excitation skeleton is shown in figure 8.

The mounting step is simple to operate, and the permanent magnet can be clamped and positioned, so that the processing time is shortened, the processing efficiency is improved, and the manufacturing cost is saved.

According to the 4 embodiments, reasonable installation size data is obtained through the optimization of the width, the thickness and the length of the grooves of the claw poles, and the claw poles are integrally cast or forged; further adopting the reliable installation step of the permanent magnet motor; the installation size, the reasonability and the manufacturability in the installation process can improve the stability, the reliability and the service life of the motor, and expand the application range and the service life cycle of the motor.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (9)

1. A claw pole, characterized by comprising a yoke part (1) and a plurality of claw-shaped magnetic poles (2);

the claw-shaped magnetic poles (2) are uniformly arranged along the axial direction of the magnetic yoke part (1); the claw-shaped magnetic pole (2) is connected with the yoke part (1) through a connecting part (3);

wherein the left side surface (21) and the right side surface (21) of the claw-shaped magnetic pole (2) are both provided with the same groove edge (22); when the two claw poles are installed in a matching mode, a permanent magnet installation groove is formed between the side surfaces (21) of the two adjacent claw-shaped magnetic poles (2); the width W of the groove edge (22) is 0.5-6 mm.

2. A claw pole according to claim 1, characterised in that the thickness H of the groove edge (22) is 0.5-5 mm.

3. A claw pole according to claim 1, characterised in that the cross section of the outer side (23) of the claw pole (2) is made up of rectangles and isosceles trapezoids; the length L of the groove edge (22) is the same as the length of the waist of the isosceles trapezoid.

4. A claw pole as claimed in claim 1, wherein the assembly gap between the permanent magnet mounting groove and the permanent magnet is 0.02-4 mm.

5. A claw pole according to claim 1, characterized in that the yoke part (1) is cast or forged in one piece with the plurality of claw poles (2) and the connecting part (3).

6. A claw pole according to claim 1, characterized in that the yoke part (1) is provided with excitation wire slots (11); the excitation wire slots (11) are uniformly distributed on the circumference of the yoke part (1); the bottom of the excitation wire slot (11) is a concave curved surface, and the radius of the concave curved surface is R1.

7. A claw pole according to claim 1, characterised in that the transition between two adjacent connection parts (3) is via a circular arc (12).

8. A permanent magnet motor is characterized by comprising the following components in sequence from inside to outside: a rotor shaft (51), an excitation winding (52), a claw pole part (53), an armature winding (54) and an armature core (55);

wherein the claw pole part (53) comprises a front claw pole (531) and a rear claw pole (532) which are installed in a buckling way; the front claw pole (531) and the rear claw pole (532) are claw poles according to any one of claims 1 to 8;

and after the front claw pole (531) and the rear claw pole (532) are buckled, a permanent magnet mounting groove is formed between the adjacent claw-shaped magnetic poles (2) and is used for mounting the permanent magnet (56).

9. A method for mounting a permanent magnet motor rotor assembly is characterized by comprising the following steps:

step (1), pores are arranged on the side wall of the excitation framework, a high-temperature adhesive is coated on an enameled wire in the excitation framework through the pores arranged on the side wall of the excitation framework, and excitation windings are placed in the front claw pole and the rear claw pole;

step (2) pressing a rotor shaft into the shaft holes of the front claw pole and the rear claw pole, and mounting a slip ring;

connecting the slip ring with a lead of an excitation winding, packaging the lead of the excitation winding in an excitation wire slot by using an adhesive, and correcting a permanent magnet mounting groove between the front claw pole and the rear claw pole by using a milling cutter after the adhesive is dried;

step (4) finely turning and processing the excircle, the shaft and the slip ring of the rotor; coating a high-temperature-resistant adhesive in the permanent magnet or the permanent magnet mounting groove, and mounting the permanent magnet;

welding fans at two ends of the rotor, dynamically balancing the rotor, preheating, dipping paint and baking the rotor;

and (6) removing redundant paint marks after paint dipping, performing dynamic balance, spraying antirust paint and antirust oil, and warehousing for packaging.

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