CN209948921U

CN209948921U - Three-phase asynchronous motor

Info

Publication number: CN209948921U
Application number: CN201920930718.9U
Authority: CN
Inventors: 林星江; 陈石香; 陈启县
Original assignee: Constant Speed Holding Co Ltd
Current assignee: Constant Speed Holding Co Ltd
Priority date: 2019-06-19
Filing date: 2019-06-19
Publication date: 2020-01-14
Anticipated expiration: 2029-06-19

Abstract

The utility model discloses a three-phase asynchronous motor, which comprises a rotor, wherein the rotor comprises a rotor core formed by overlapping rotor core punching sheets and end rings arranged at two ends of the rotor core; a group of blades distributed along the radial direction are uniformly arranged on the end face of the end ring along the circumferential direction, and a balance column is arranged between every two adjacent blades; the fan blades are divided into large fan blades and small fan blades which are arranged at intervals; the large fan blade is hung out relative to the inner side surface of the end ring to form a hanging-out part, and the bottom of the hanging-out part is connected with the end surface of the rotor iron core; the height H of the hanging-out part is 3-5 mm; the fan blades are of a structure with a small upper part and a large lower part; and a group of fan-shaped grooves which are symmetrical relative to the large fan blade are arranged on the outer side surface of the end ring and correspond to the large fan blade one by one. The utility model discloses an adopt new end links structure, the resistance of rotor when starting is big to have great starting torque, just the utility model has the advantages of the heat dissipation is fast.

Description

Three-phase asynchronous motor

Technical Field

The utility model relates to the technical field of electric machines, concretely relates to starting torque is big, the fast three-phase asynchronous motor of heat dissipation.

Background

A three-phase asynchronous motor is one of induction motors, and is a type of motor that is powered by a 380V three-phase alternating current (120 degrees out of phase), and is widely used to drive various mechanical devices. For example, air compressors for compressing air generally use three-phase asynchronous motors as power sources.

The starting torque of a three-phase asynchronous motor is one of the important indexes for measuring the performance of the motor. The higher the starting torque of a three-phase asynchronous motor, the better its performance is generally considered. In the prior art, in order to increase the starting torque of a motor, a common method is to increase the resistance of a rotor core during starting by changing a groove-shaped structure on a rotor punching sheet and reduce the reactance of a rotor. However, the change of the groove-shaped structure of the motor rotor may cause the quality of cast aluminum to be reduced, and further, the quality and the performance of the whole motor are affected. In addition, the heat dissipation performance of the motor is also one of the aspects of measuring the performance of the motor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a three-phase asynchronous motor. The utility model discloses an adopt new end links structure, the resistance of rotor when starting is big to have great starting torque, just the utility model discloses still have the fast advantage of heat dissipation.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the three-phase asynchronous motor comprises a rotor, wherein the rotor comprises a rotor core formed by overlapping rotor core stamped sheets and end rings arranged at two ends of the rotor core; a group of blades distributed along the radial direction are uniformly arranged on the end face of the end ring along the circumferential direction, and a balance column is arranged between every two adjacent blades; the fan blades are divided into large fan blades and small fan blades which are arranged at intervals; the large fan blade is hung out relative to the inner side surface of the end ring to form a hanging-out part, and the bottom of the hanging-out part is connected with the end surface of the rotor iron core; the height H of the hanging-out part is 3-5 mm; the fan blades are of a structure with a small upper part and a large lower part; and a group of fan-shaped grooves which are symmetrical relative to the large fan blade are arranged on the outer side surface of the end ring and correspond to the large fan blade one by one.

Compared with the prior art, the utility model discloses a three-phase asynchronous motor has made following progress: 1) under the condition of not changing the groove shape of the rotor, the fan-shaped grooves are correspondingly arranged on the outer side surface of the end ring and the large fan blade, so that the current flowing area is reduced, and the resistance during starting is increased, thereby realizing the increase of the starting torque of the motor, and meanwhile, the structure that the large fan blade is hung out relative to the inner side of the end ring and is connected with the end part of the rotor iron core can compensate the reduction of the mechanical strength caused by the grooves, and the end ring is ensured to have enough mechanical strength; 2) through the non-standard design of the large fan blade and the small fan blade, the large fan blade is larger in size, the air quantity can be increased, the heat dissipation capacity is improved, meanwhile, the contact area with air is larger, the heat dissipation is also facilitated, the temperature rise of the motor during operation is reduced, the temperature of a bearing of the motor is also reduced, and the service life of the motor can be prolonged; 3) the design that the fan-shaped grooves are formed in the side portions of the end rings also increases the contact area between the end rings and air, further improves the heat dissipation capacity, and can prolong the service life of the motor.

Preferably, the distance d between the sector grooves and the rotor core is 20-30% of the thickness of the end ring. The fan-shaped groove is arranged close to the rotor core, the upper part of the end ring is thicker, and the integral mechanical strength is good.

Preferably, the depth of the fan-shaped groove is 75-80% of the ring width of the end ring at the notch. The deeper the groove, the greater the resistance of the rotor, but the mechanical strength of the end ring is weakened, which in the test surface is ensured to have a higher mechanical strength, at the same time as the rotor has a higher starting resistance.

Preferably, the distance D between two adjacent fan-shaped grooves is equal to 15-20% of the length L of a single fan-shaped groove. The smaller the spacing distance D between two adjacent fan-shaped grooves is, the larger the rotor resistance is, but the mechanical strength is reduced, and tests show that the mechanical strength of the end ring is high, and meanwhile, the starting resistance is larger.

Optimally, the center line of the balance post is positioned on the inner side of the center line of the end face of the end ring; the distance between the center line of the balance post and the center line of the end ring end face is 20-30% of the width of the end ring end face. The non-standard design that the balancing post leaned on inboard to set up can avoid when the balancing piece size is great, hangs out for the end ring lateral surface to can avoid the enameled wire on the stator to be cut bad by the balancing piece.

Furthermore, the number of the fan blades is eight, and the large fan blade and the small fan blade are four respectively. At the moment, the number of the fan blades is proper, and manufacturing and cost control are facilitated.

Furthermore, the rotor core stamped sheet is a silicon steel sheet formed by one-time stamping. The silicon steel sheet formed by one-step stamping can ensure the consistency of the size, reduce the outer circle run-out of the rotor, ensure the surface of the rotor core to be neat and smooth, and ensure that the resistance between the rotor core stamped sheets is not reduced, thereby reducing the pulsation loss and the high-frequency loss in the use process.

Drawings

Fig. 1 is a schematic structural view of a rotor of a three-phase asynchronous motor according to the present invention;

fig. 2 is a front view of the rotor of the three-phase asynchronous motor of the present invention;

fig. 3 is a plan view of a rotor of a three-phase asynchronous motor according to the present invention.

The labels in the figures are: 1-a rotor core; 2-end ring, 21-balance column, 22-large fan blade, 221-hanging part, 23-small fan blade and 24-fan-shaped groove.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments (examples), which are described herein for illustrative purposes only and are not intended to be a basis for limiting the present invention.

The utility model discloses do not relate to slot configuration, cast aluminium conducting bar and the pivot on the rotor core, do not draw slot configuration, cast aluminium conducting bar and pivot in the attached drawing.

Referring to fig. 1, 2 and 3, the three-phase asynchronous motor of the present invention includes a rotor including a rotor core 1 formed by stacking rotor core laminations and end rings 2 disposed at both ends of the rotor core 1; a group of blades distributed along the radial direction are uniformly arranged on the end face of the end ring 2 along the circumferential direction, and a balance column 21 is arranged between every two adjacent blades; the fan blades are divided into large fan blades 22 and small fan blades 23, and the large fan blades 22 and the small fan blades 23 are arranged at intervals; the large fan blade 22 is hung relative to the inner side surface of the end ring 2 to form a hanging-out part 221, and the bottom of the hanging-out part 221 is connected with the end surface of the rotor core 1; the height H of the hanging-out part 221 is 3-5 mm; the design of the hanging-out part 221 increases the heat dissipation area, accelerates the heat dissipation, and can improve the mechanical strength of the end ring 2; the fan blades are of a structure with a small top and a large bottom, and the inner end faces of the fan blades are in an isosceles trapezoid shape (the structure with the small top and the large bottom has high mechanical strength, and meanwhile, the hanging part of the large fan blade 22 relative to the end ring 2 has high resistance, so that the starting torque of the motor can be improved); a group of fan-shaped grooves 24 which are symmetrical relative to the large fan blades 22 are arranged on the outer side surface of the end ring 2 and correspond to the large fan blades 22 one by one (the fan-shaped grooves 24 can be obtained by milling).

The distance d of the sector grooves 24 from the rotor core 1 may be 20-30% of the thickness of the end ring 2. The sector grooves 24 are arranged close to the rotor core 1, the upper part of the end ring 2 is thick, and the overall mechanical strength is good.

The depth of the sector grooves 24 may be 75-80% of the ring width of the end ring 2 at the grooving. The deeper the sector grooves 24, the greater the resistance of the rotor, but the mechanical strength of the end ring 2 is weakened, the test surface, which guarantees a high mechanical strength and at the same time a high starting resistance of the rotor.

The distance D separating two adjacent sectors 24 may correspond to 15-20% of the length L of a single sector 24. The smaller the distance D between two adjacent segments 24, the greater the rotor resistance, but the lower the mechanical strength, and tests have shown that the end ring 2 is mechanically strong and has a higher starting resistance.

The center line of the balance post 21 can be positioned inside the center line of the end face of the end ring 2; the distance between the center line of the balance post 21 and the center line of the end face of the end ring 2 is 20-30% of the width of the end face of the end ring 2. The non-standard design that the stabilizer 21 leaned on the inboard to set up compares in the standard design of locating the middle part, can avoid when the stabilizer size is great, hangs out for end ring 2 lateral surface to can avoid the enameled wire on the stator to be cut bad by the stabilizer.

As a specific example: the number of the fan blades is eight, and the large fan blade 22 and the small fan blade 23 are four respectively. The rotor core stamped sheet is a silicon steel sheet formed by one-time stamping.

The above general description of the invention and the description of its specific embodiments in this application should not be construed as limiting the scope of the invention. Those skilled in the art can add, reduce or combine the technical features disclosed in the general description and/or the specific embodiments (including the examples) to form other technical solutions within the scope of the present application according to the disclosure of the present application without departing from the components of the present invention.

Claims

1. The three-phase asynchronous motor comprises a rotor, wherein the rotor comprises a rotor core (1) formed by overlapping rotor core stamped sheets and end rings (2) arranged at two ends of the rotor core (1); a group of blades distributed along the radial direction are uniformly arranged on the end surface of the end ring (2) along the circumferential direction, and a balance column (21) is arranged between every two adjacent blades; the method is characterized in that:

the fan blades are divided into large fan blades (22) and small fan blades (23), and the large fan blades (22) and the small fan blades (23) are arranged at intervals; the large fan blade (22) is hung relative to the inner side surface of the end ring (2) to form a hanging-out part (221), and the bottom of the hanging-out part (221) is connected with the end surface of the rotor core (1); the height H of the hanging-out part (221) is 3-5 mm; the fan blades are of a structure with a small upper part and a large lower part;

and a group of fan-shaped grooves (24) which are symmetrical relative to the large fan blades (22) are arranged on the outer side surface of the end ring (2) and correspond to the large fan blades (22) one by one.

2. Three-phase asynchronous motor according to claim 1, characterized in that: the distance d between the fan-shaped grooves (24) and the rotor core (1) is equal to 20-30% of the thickness of the end ring (2).

3. Three-phase asynchronous motor according to claim 2, characterized in that: the depth of the fan-shaped groove (24) is 75-80% of the ring width of the end ring (2) at the notch.

4. A three-phase asynchronous motor according to claim 3, characterized in that: the spacing distance D between two adjacent fan-shaped grooves (24) is equal to 15-20% of the length L of the single fan-shaped groove (24).

5. A three-phase asynchronous motor, according to any of the claims from 1 to 4, characterized in that: the center line of the balance post (21) is positioned at the inner side of the center line of the end face of the end ring (2); the distance between the center line of the balance post (21) and the center line of the end face of the end ring (2) is 20-30% of the width of the end face of the end ring (2).

6. A three-phase asynchronous motor, according to any of the claims from 1 to 4, characterized in that: the number of the fan blades is eight, and the number of the large fan blades (22) and the number of the small fan blades (23) are four respectively.

7. A three-phase asynchronous motor, according to any of the claims from 1 to 4, characterized in that: the rotor core stamped sheet is a silicon steel sheet formed by one-time stamping.