CN101521416B - Low-noise alternating current (AC) motor - Google Patents

Abstract

A low-noise AC motor, belonging to the technical field of motor manufacturing, mainly includes a casing (6), a front end cover (16) and a rear end cover (10) with bearings (2) placed inside the two ends of the casing (6) , place the rotor core (11) with the drive shaft (5) inside the casing (6), and fix it on the inner wall of the casing (6) to the plastic-sealed stator (17) composed of the stator core (7) and the winding (12). ), the circumferential surface of the rotor core (11) is provided with a V-shaped chute (14); the stator core (7) is composed of stacked stator core punches (13), and the bottom of the stator core punches (13) There are 1 to 3 virtual grooves (15) on the pole shoe; wave springs (3) are respectively arranged between the bearing (2), the front end cover (16) and the rear end cover (10). The overall structure design is reasonable, and it provides an all-round way to reduce motor noise from the aspects of rotor, stator, stator and rotor assembly, etc., which can effectively improve the running noise of the motor and improve product quality.

Description

Low Noise AC Motor

technical field

The invention relates to a low-noise AC motor, which belongs to the technical field of motor manufacturing.

Background technique

Motors are used more and more widely in people's lives, such as air conditioner motors, washing machine motors, refrigerator motors, etc. Such a wide application and such a large amount of use make the technical upgrading of motors have considerable economic benefits. From traditional distributed winding motors Upgrading to concentrated winding motors will greatly reduce the amount of iron and copper used, which will enhance the competitiveness of the company. However, the noise problem of plastic-sealed motors has always restricted its development. How to effectively solve the noise problem of concentrated winding motors has become a major issue for concentrated winding motors. Obstacles that must be overcome for development.

Contents of the invention

The object of the present invention is to provide a low-noise AC motor with reasonable design and simple structure, which can effectively improve the running noise of the motor and improve product quality.

The invention is a low-noise AC motor, which includes a casing, a front end cover and a rear end cover with bearings at both ends of the casing, a rotor core with a drive shaft inside the casing, and a stator core fixed on the inner wall of the casing. The plastic-sealed stator composed of iron core and winding is characterized in that there is a V-shaped inclined groove on the circumferential surface of the rotor iron core, and the included angle of the V-shaped inclined groove is 83-122 degrees; the stator iron core is stacked by stator iron core punching pieces Composition, the pole shoe at the bottom of the stator iron core punching sheet is provided with a virtual slot; the bearing, the front end cover, and the rear end cover are respectively provided with wave springs.

The depth of the V-shaped chute may be 12±2mm.

The two sides of the shaft hole of the rotor core can also be provided with grooves concentric with the shaft hole respectively, the diameter of the groove is 1.2-1.8 times the diameter of the shaft hole, and the depth is 1.5-2mm.

The number of virtual slots on the pole piece can be 1-3.

The upper and lower ends of the casing can also be provided with mounting feet and mounting holes.

Aiming at the source of motor noise, the invention provides an idea of reducing motor noise in all aspects from the aspects of rotor, stator, stator-rotor assembly, etc., and can reduce the noise generated by the motor to a greater extent. Compared with the prior art, it has the following outstanding advantages and positive effects:

1. On the rotor, by setting a V-shaped chute on the circumferential surface of the rotor core, the influence of the axial force caused by the cutting magnetic induction when the rotor rotates is eliminated, the stress caused by the transverse current of the rotor winding is improved, and the motor can be effectively reduced. running noise. At the same time, grooves concentric with the shaft hole are provided on both sides of the shaft hole of the rotor core, which can effectively prevent the bad influence on the core end during the die-casting of the rotor core.

2. On the stator, by adding virtual slots on the pole pieces of the stator core, the working principle of the virtual slots is that the frequency of the tooth harmonic is low and the amplitude is high; the frequency is high and the amplitude is low, and the higher the amplitude, the greater the noise , by adding a virtual slot to make the tooth harmonic frequency higher and the amplitude lower, thereby reducing the noise.

3. From the general assembly of the motor, the noise of the motor is reduced by using wave springs to suppress the axial movement of the rotor when the motor is running. Because the wave spring gives the rolling bearing a preload, it also eliminates the noise generated during the ball clearance operation.

After the improvement in the above three aspects, the effect of the present invention is that the noise of the motor is significantly improved, and the motor runs with the lowest noise to the greatest extent.

Description of drawings

Fig. 1 is a half-sectional view of the overall structure of the present invention;

Fig. 2 is a half-sectional view of the rotor core structure of the present invention;

Fig. 3 is a schematic structural view of the stator core punching sheet according to the present invention.

In the figure, 1 is the mounting foot, 2 is the bearing, 3 is the wave spring, 4 is the E-ring, 5 is the transmission shaft, 6 is the casing, 7 is the stator core, 8 is the installation hole, 9 is the lead wire hole, 10 is the rear end cover, 11 is the rotor core, 12 is the winding, 13 is the stamped stator core, 14 is the V-shaped chute, 15 is the virtual slot, 16 is the front cover, 17 is the plastic stator, 18 is the rotor concave groove.

Detailed ways

The present invention mainly comprises a casing 6 with lead-out wire holes 9, a front end cover 16 and a rear end cover 10 with bearings 2 placed inside the two ends of the casing 6, and a rotor core 11 with a drive shaft 5 placed inside the casing 6. , and fixed on the inner wall of the casing 6 is a plastic-encapsulated stator 17 composed of a stator core 7 and a winding 12, and a V-shaped chute 14 with an included angle a of 83 to 122 degrees is opened on the circumferential surface of the rotor core 11; the stator core 7 is composed of stacked stator core punches 13. There are 1 to 3 dummy slots 15 on the pole shoes at the bottom of the stator core punches 13; play 3. The upper and lower ends of the casing 6 are also provided with mounting feet 1 and mounting holes 8 . The depth of the V-shaped chute 14 is 12 ± 2 mm; the two sides of the shaft hole of the rotor core 11 are respectively provided with grooves 18 concentric with the shaft hole, the diameter of the groove 18 is 1.2 to 1.8 times the diameter of the shaft hole, and the depth is 1.5 ~ 2mm.

Determine the height of the rotor core 11 on the high-speed punching machine according to the needs. Because it is a V-shaped chute 14, it is necessary to use two sets of chute controllers to determine the V-shaped shape. The V-shaped size can be selected according to the performance of the motor parameters, and then the The molten aluminum is poured into the aluminum injection hole for die-casting, and the mold is removed, that is, the production of the cast aluminum rotor is completed, and the next operation is carried out. After the cast aluminum rotor is polished, a V-shaped chute 14 is opened, and the transmission shaft 5 with the E-shaped ring 4 is pressed into it to form the rotor core 11 .

Determine the height of the stator core 7 as required, die-cast the stator core punching piece 13, and align it with the fastening point. After stamping, ensure that the virtual slot 15 remains neat, and then assemble the iron core into a circle. Install the bushing, wind the main and auxiliary wires, form a circle, press the hoop in, lead out, connect with the bridge wire, and finally make the stator core 7, and then plastic seal the stator core 7 to form a plastic package, that is, the plastic packaged stator is completed 17 productions.

Finally, the motor is assembled. First, install the rotor core 11 on the bearing 2, and then put it into the plastic-sealed stator 17; then use a high-speed air gun to wash the wave bomb 3 to remove the sticking dust, put it outside the bearing 2, make sure it is flat, and put it on. Front and rear end caps 16,10 are pressed in with a press-in machine, that is, the low-noise AC motor described in the present invention is assembled.

Claims (4)

1. low noise alternating current machine, comprise casing (6), place front end housing (16) and the rear end cap (10) of establishing bearing (2) in casing (6) two ends, place the rotor core (11) of band power transmission shaft (5) in the casing (6), be fixed in the plastic packaging stator (17) that constitutes by stator core (7) and winding (12) on casing (6) inwall, it is characterized in that offering V-arrangement skewed slot (14) on the periphery of rotor core (11), the angle a of V-arrangement skewed slot (14) is 83～122 degree; Stator core (7) is made of stator core stamping sheet (13) closed assembly, offers virtual groove (15) on the pole shoe of stator core stamping sheet (13) bottom; Be respectively equipped with ripple bullet (3) between bearing (2) and front end housing (16), the rear end cap (10); The axis hole both sides of described rotor core (11) also offer the groove concentric with axis hole (18) respectively, and the diameter of groove (18) is 1.2～1.8 times of shaft hole diameter, and the degree of depth is 1.5～2mm.

2. by the described low noise alternating current machine of claim 1, the degree of depth that it is characterized in that described V-arrangement skewed slot (14) is 12 native 2mm.

3. by the described low noise alternating current machine of claim 1, it is characterized in that the offer quantity of described virtual groove (15) on pole shoe is 1～3.

4. by the described low noise alternating current machine of claim 1, it is characterized in that the two ends up and down of described casing (6) also are provided with installation foot (1) and installing hole (8).

Images