CN218733447U

CN218733447U - Synchronous motor

Info

Publication number: CN218733447U
Application number: CN202222174551.2U
Authority: CN
Inventors: 王奔; 王夏春
Original assignee: Wuxi Haoli Pumps Industrial Co ltd
Current assignee: Wuxi Haoli Pumps Industrial Co ltd
Priority date: 2022-08-17
Filing date: 2022-08-17
Publication date: 2023-03-24
Anticipated expiration: 2032-08-17

Abstract

The utility model discloses a synchronous motor, which comprises a stator, a cavity, an iron core, a rotor, a magnet and a clamping part, wherein the rotor is arranged in the cavity; the magnet and the clamping part are injected together, one end of the clamping part is provided with an accommodating cavity, the bottom of the accommodating cavity is provided with a starting rib, and a coupling assembly and an elastic body are arranged inside the accommodating cavity; the shaft coupling subassembly includes rotation axis and shaft coupling, and the shaft coupling includes the axle sleeve that sets up on the rotation axis and sets up in the axle sleeve lateral wall and along the radial shifting block that extends, the axial height sum of the axial height of start muscle and shifting block is less than the axial height of elastomer, and start muscle and shifting block mutually noninterfere in the axial direction, the idle running angle of magnet relative to the rotation axis when starting is 280 ~ 380. The utility model discloses make synchronous machine neither extravagant manufacturing cost, can the energy can be saved again simultaneously.

Description

Synchronous motor

Technical Field

The utility model belongs to the technical field of the motor, especially, relate to a synchronous machine.

Background

Synchronous machines on the market today generally consist mainly of two parts, a stator and a rotor, wherein the rotor is placed in the center of the stator core. The rotor can drive a certain load to rotate through the rotating shaft under the action of the alternating magnetic field of the stator, the larger the load applied to the synchronous motor is, the more difficult the starting of the synchronous motor is, the larger the rated power of the synchronous motor is required to be, and therefore the larger the width of a magnetic circuit formed by the stator iron core and the larger the radial magnetizing length of the magnet are.

Aiming at the problem that the synchronous rotating speed is difficult to obtain in the starting process of the synchronous motor, the prior art is provided with a clamping part which is injected with a magnet together; one end of the clamping part is provided with an accommodating cavity, a coupler and an elastic body are arranged in the accommodating cavity, when the synchronous motor is started, the coupler and the elastic body serve as a power transmission part, and can idle for an angle at zero load in the accommodating cavity, so that time for achieving synchronous rotating speed is provided for the motor, and when the rotor and the stator reach a synchronous state, the synchronous motor is started. In the prior art, the idle rotation angle is set to be about 200 degrees, and the unreasonable rotation angle setting results in higher input power, larger magnetic circuit width B and magnetizing length L during starting, which not only causes energy waste, but also increases the weight and volume of the whole synchronous motor and increases the manufacturing cost; for example, when the rated power of the motor in the prior art is 20W-30W, because of the limitation of the structure of the starting cavity, the idling angle of the motor with zero load can only be set to about 200 °, the width B of the magnetic circuit formed by the iron core is selected to be 20 mm-25 mm, and the radial magnetizing length L of the magnet is selected to be 30 mm-35 mm, so that the actual input power of the synchronous motor is 30W-35W and is greater than the rated power of the load carried by the motor; similarly, for a motor with larger power, when the rated power of the motor is 60W-70W, the starting angle of the motor zero-load idling is generally set to be about 200 °, the width B of the magnetic circuit formed by the iron core is selected to be between 35mm and 40mm, and the radial magnetizing length L of the magnet is selected to be between 45mm and 50mm, so that the actual input power of the synchronous motor is between 75W and 80W, which is larger than the rated power of the load carried by the motor, and the energy is wasted.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: the utility model aims at providing a low in manufacturing cost, the few synchronous machine of energy resource consumption.

The technical scheme is as follows: the utility model discloses a synchronous motor, which comprises a stator and a rotor, wherein the stator comprises a cavity and an iron core, and the rotor is arranged in the cavity; the rotor comprises a magnet and a clamping part which is injected with the magnet together, and one end of the clamping part is provided with an accommodating cavity; the bottom of the accommodating cavity is provided with a starting rib, and the inside of the accommodating cavity is provided with a coupling assembly and an elastic body; the coupler assembly comprises a rotating shaft and a coupler, the coupler comprises a shaft sleeve arranged on the rotating shaft and a shifting block which is arranged on the outer side wall of the shaft sleeve and extends along the radial direction, the sum of the axial height of the starting rib and the axial height of the shifting block is smaller than the axial height of the elastic body, the starting rib and the shifting block are not interfered with each other in the axial direction, the idling angle of the magnet relative to the rotating shaft is more than or equal to 360 degrees and less than or equal to 380 degrees, and alpha is an included angle between two side faces of the shifting block; beta is the included angle between the passive surfaces at the two sides of the elastic body; theta is the included angle between the two side surfaces of the starting rib.

The coupler is made of plastics, and the axial height of the coupler is smaller than the axial depth of the accommodating cavity; the shifting block on the coupler is sector-shaped, and discs are arranged on the axial end faces of the shaft sleeve and the shifting block.

Wherein, the ratio of the inner diameter of the accommodating cavity to the outer diameter of the magnet is 0.75-0.85; the ratio of the outer diameter of the shaft sleeve to the outer diameter of the rotating shaft is 1.4-2.

The rotor is characterized in that an end cover is installed on the outer wall of one side of the opening of the accommodating cavity, the end cover comprises a center hole and bosses protruding towards the two sides of the center hole along the axial direction, rubber rings are arranged at the center hole of each boss, and one end, close to the shaft sleeve, of the rotating shaft penetrates through the rubber rings to be installed on the rotor.

The iron core is U-shaped, a through hole is formed in the position, close to the opening, of the iron core, and the iron core is made of silicon steel or cold-rolled steel plates.

The magnet penetrates through the through hole in the iron core, and the manufacturing material of the magnet is ferrite magnetic material.

Has the beneficial effects that: compared with the prior art, the utility model has the advantages of it is following: the utility model determines the rated power according to the actual required load, and sets the idle rotation angle at 280-380 degrees through the optimization design of the idle rotation angle when the motor is started; compare with the idle rotation angle of prior art about 200, the utility model discloses reduce the actual input power of motor, reduced the radial length of magnetizing of the magnetic circuit width that stator core constitutes and magnet for synchronous machine has still reduceed manufacturing cost in the energy can be saved and has reduced the volume of complete machine.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of a portion of I in FIG. 1;

FIG. 3 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 1;

FIG. 4 is a schematic view of the start rib, the elastic body and the included angle between two side surfaces of the shifting block;

fig. 5 is a schematic view of an assembly structure of the stator and the rotor according to the present invention.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings.

As shown in fig. 1 to 5, the synchronous machine of the present invention includes a stator 1 and a rotor 2, the stator 1 includes a cavity 11 and an iron core 12 enclosed by the stator 1, and further includes an electromagnetic coil 13 located on the periphery of the iron core 12, when an external power supply supplies power to the electromagnetic coil 13, a magnetic line of force generated by the electromagnetic coil 13 passes through the iron core 12, at this time, the iron core 12 forms a working magnetic circuit of the synchronous machine, where a width of the magnetic circuit formed by the iron core 12 is set to be B, because a magnetic field generated by the stator 1 is rotating, a magnet 21 in the rotor 2 will start under an alternating magnetic field generated by the magnetic line of force, the rotor can drive a certain load to rotate under the alternating magnetic field of the stator through a rotating shaft, it should be noted that the larger the load applied to the synchronous machine is, the more difficult the starting thereof is, and the problem that it is difficult to obtain a synchronous rotating speed in the starting process of the synchronous machine is solved, therefore, the rotor 2 includes a magnet 21 and a clamping portion 22 injection-molded with the magnet 21; one end of the clamping part 22 is provided with an accommodating cavity 23, a starting rib 24 which is injected at the bottom of the accommodating cavity 23, a coupling injection molding assembly 25 and an elastic body 26, the rotor 2 is placed in the cavity 11 which is surrounded by the stator 1, the magnet 21 needs to be magnetized in the radial direction, the magnetizing length is set to be L, when the synchronous motor is started, the coupling and the elastic body are used as power transmission parts, zero load idling is carried out in the accommodating cavity 23 for an angle, so that time for achieving synchronous rotating speed is provided for the motor, when the rotor and the stator reach a synchronous state, the synchronous motor is started, the starting is difficult when the angle is too small, the impact of the elastic body 26 on the shifting block 2522 is too large when the angle is too large, and the service life of the motor is shortened.

As shown in fig. 4, the above coupling injection molding assembly 25 includes a rotating shaft 251 and a coupling 252, the coupling 252 includes a sleeve 2521 injection-molded on the rotating shaft 251, and a shifting block 2522 fixed on an outer side wall of the sleeve 2521 and extending in a radial direction, the sleeve 2521 and the shifting block 2522 are integrally injection-molded, the coupling 252 is used as a part of power transmission, the rotating shaft 251 is used as power output and connected to a load, and the motor drives the load to rotate after synchronous start.

As shown in fig. 1, 3 and 4, the coupling injection-molded component 25 and the elastic body 26 are placed in the receiving cavity 23, when the magnet 21 rotates, the actuating rib 24 pushes the elastic body 26 to slide axially in the receiving cavity 23, and the elastic body 26 pushes the shifting block 2522 so that the rotating shaft 251 rotates, and the maximum angle that the actuating rib 24 rotates from its initial position to when the elastic body 26 pushes the shifting block 2522 is the zero-load idle angle of the motor. As shown in fig. 3, an included angle between two side surfaces of the sector shifting block 2522 in the accommodating cavity is α, an included angle between the left and right driven surfaces 261 of the elastic body 26 is β, an angle θ corresponding to the two side surfaces 241 of the actuating rib 24 is θ, and an idling angle of the motor with zero load is 360 ° +360 ° - α -2 β - θ. The utility model can lead the motor to have a zero-load idle angle of 330-380 degrees, when the rated power of the motor is 20-30W, the width B of the magnetic circuit formed by the iron core is 10-15 mm, and the radial magnetizing length L of the magnet is 25-30 mm; the motor zero load idling angle is (360-alpha-beta) + (360-beta-theta), when the included angle alpha between the two side surfaces of the sector shifting block 2522 is preferably 40-50 degrees, the included angle beta between the left and right driven surfaces 261 of the elastic body 26 is preferably 105-120 degrees, the corresponding angle theta of the two side surfaces 241 of the starting rib 24 is preferably 90-100 degrees, so that the motor zero load idling angle is 330 degrees or more and 360-alpha-2 beta-theta or less and 380 degrees, and in the range of the motor zero load idling angle, the purposes of reducing the motor manufacturing cost and saving energy can be achieved by optimally taking the magnetic circuit width B and the radial magnetizing length L of the magnet.

For a high-power synchronous motor, the rated power of the motor is 60W-70W, the three angles of alpha, beta and theta are reasonably set, so that when the idling angle of the motor with zero load meets the conditions that the idling angle is more than or equal to 280 degrees and less than or equal to 360 degrees and the idling angle is more than or equal to 360 degrees and less than or equal to 330 degrees, the width B of a magnetic circuit formed by the iron core 12 is 25 mm-30 mm, and the radial magnetizing length L of the magnet 21 is 30 mm-40 mm, and the aims of reducing the manufacturing cost of the motor and saving energy can be achieved.

The coupling 252 is a plastic coupling, the dials 2522 on the coupling 252 are fan-shaped, and the axial end faces of the sleeve 2521 and the dials 2522 are provided with a disc 2523, the disc 2523 can further enhance the injection molding strength of the coupling 252 on the one hand, and on the other hand, the disc 2523 can position the elastic body 26 in the axial direction to prevent the elastic body 26 from shifting too much in the axial direction and being more prone to wear.

The elastic body 26 is a rubber elastic body, the elastic body 26 is in a fan shape, the sum of the axial height of the starting rib 24 and the axial height of the shifting block 2522 is smaller than the axial height of the elastic body 26, the starting rib 24 and the shifting block 2522 do not interfere with each other in the axial direction, on one hand, damage caused by rigid collision between the starting rib 24 and the shifting block 2522 due to axial movement is eliminated, on the other hand, a larger idling angle of zero-load idling of the motor is obtained, so that the idling angle is 360 degrees +360 degrees-alpha-2 beta-theta degrees, and the axial height of the coupling 252 is smaller than the axial depth of the accommodating cavity 23, so that a sliding space of the coupling 252 and the elastic body 26 in the accommodating cavity 23 is provided.

The starting rib 24 is arc-shaped, an interference preventing gap is formed between the inner wall of the starting rib 24 and the outer side wall of the shaft sleeve 2521, the end part of the starting rib 24 is injected on the inner wall of the accommodating cavity 23 and is integrated with the magnet 21 and the clamping part 22 through injection molding, and the magnet 21 and the starting rib 24 synchronously rotate.

The ratio of the inner diameter of the accommodating cavity 23 to the outer diameter of the magnet 31 is 0.75-0.85, so that the magnetic field intensity required by the magnet 31 can be ensured in the range, and the injection molding intensity of the accommodating cavity 23 can be ensured; the ratio of the outer diameter of the shaft sleeve 2521 to the outer diameter of the rotating shaft 251 is 1.4-2, so that the injection molding bonding force strength of the shaft sleeve 2521 and the rotating shaft 251 is ensured; the axial height of the elastic body 26 is smaller than that of the shaft sleeve 2521, so that the starting rib 24 and the shifting block 2522 are prevented from being rigidly collided and damaged due to axial movement, and the service life of the rotor is prevented from being influenced.

An end cover 27 is arranged on one side of the opening of the accommodating cavity 23, and the end cover 27 is sleeved on the outer wall of the accommodating cavity 23 and fixed, so that the magnet 21 and the end cover 27 are integrated.

The end cap 27 includes a central hole 271 and bosses 272 protruding in the axial direction toward both sides of the central hole 271, the bosses 272 are provided with the rubber ring 28 at the central hole 271, the rotating shaft 251 passes through the rubber ring 28, the bosses 272 are provided for reducing the friction loss caused by the movement of the end cap 27 and the disc 2523 of the coupling 252 in the axial direction, and the rubber ring 28 plays a role of a flexible support for the rotating shaft 251.

The iron core 12 is a silicon steel or cold-rolled steel plate iron core, and is in a U shape, the iron core in the U shape is easier to start the synchronous motor, the structure is simple, the production is convenient, the through hole 121 is formed in the position, close to the opening, of the iron core 12, the magnet 21 is a ferrite magnetic material magnet, and the magnet 21 penetrates through the hole 121 in the iron core 12, so that the magnet 21 obtains an alternating magnetic field transmitted from a magnetic circuit formed by the iron core 12, and the magnet 21 rotates around the rotating shaft 251.

Claims

1. A synchronous motor comprises a stator (1) and a rotor (2), wherein the stator (1) comprises a cavity (11) and an iron core (12), and the rotor (2) is arranged in the cavity (11); the rotor (2) comprises a magnet (21) and a clamping part (22) which is injected with the magnet (21), and one end of the clamping part (22) is provided with an accommodating cavity (23); the bottom of the accommodating cavity (23) is provided with a starting rib (24), and a coupling component (25) and an elastic body (26) are arranged inside the accommodating cavity; the coupling assembly (25) comprises a rotating shaft (251) and a coupling (252), the coupling (252) comprises a shaft sleeve (2521) arranged on the rotating shaft (251) and a shifting block (2522) arranged on the outer side wall of the shaft sleeve (2521) and extending along the radial direction, the sum of the axial height of the starting rib (24) and the axial height of the shifting block (2522) is smaller than the axial height of the elastic body (26), and the starting rib (24) and the shifting block (2522) have an interference prevention gap in the axial direction, and the coupling assembly is characterized in that: when the magnet (21) is started, the idle rotation angle of the magnet relative to the rotating shaft (251) is more than or equal to 280 degrees and less than or equal to 360 degrees and more than or equal to 360 degrees and less than or equal to 380 degrees of alpha-2 beta-theta, wherein alpha is the included angle between two side surfaces of the shifting block (2522); beta is the included angle between the passive surfaces at the two sides of the elastic body (26); theta is an included angle between two side surfaces of the starting rib (24).

2. The synchronous machine of claim 1, wherein: the axial height of the coupling (252) is smaller than the axial depth of the accommodating cavity (23); the shifting block (2522) on the coupling (252) is fan-shaped, and the axial end surfaces of the shaft sleeve (2521) and the shifting block (2522) are provided with a disc (2523).

3. The synchronous machine of claim 1, wherein: the elastic body (26) is a rubber elastic body (26), and the elastic body (26) is in a fan shape; an interference preventing gap is formed between the outer arc wall surface of the elastic body (26) and the inner wall of the accommodating cavity (23), an interference preventing gap is formed between the inner arc wall surface and the outer side wall of the shaft sleeve (2521), and the axial height of the elastic body (26) is smaller than that of the shaft sleeve (2521).

4. The synchronous machine of claim 1, wherein: the ratio of the inner diameter of the accommodating cavity (23) to the outer diameter of the magnet (21) is 0.75-0.85; the ratio of the outer diameter of the sleeve (2521) to the outer diameter of the rotating shaft (251) is 1.4 to 2.

5. The synchronous machine of claim 1, wherein: an end cover (27) is installed on the outer wall of one side of an opening of the accommodating cavity (23), the end cover (27) comprises a central hole (271) and bosses (272) protruding towards the two sides of the central hole (271) along the axial direction, rubber rings (28) are arranged on the bosses (272) at the central hole (271), and one end, close to a shaft sleeve (2521), of the rotating shaft (251) penetrates through the rubber rings (28) to be installed on the rotor (2).

6. The synchronous machine of claim 1, wherein: the iron core (12) is U-shaped, a through hole (121) is formed in the position, close to the opening, of the iron core (12), and the iron core (12) is made of silicon steel or cold-rolled steel plate.

7. The synchronous machine of claim 6, wherein: the magnet (21) penetrates through a through hole (121) in the iron core (12), and the magnet (21) is a ferrite magnet.