CN211405824U

CN211405824U - Brushless DC water pump motor with 4-slot 4-pole centralized winding

Info

Publication number: CN211405824U
Application number: CN202020108487.6U
Authority: CN
Inventors: 王伟清
Original assignee: Changsha Jiapu Pump Co ltd
Current assignee: Changsha Jiapu Pump Co ltd
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2020-09-01
Anticipated expiration: 2030-01-17

Abstract

The utility model provides a 4 groove 4 utmost points concentrated winding brushless DC pump motor. Comprises a stator, a rotor sleeved in the stator and a controller device used for driving a motor to work; the stator comprises a stator iron core, a coil framework and a stator coil; the coil framework is sleeved on the stator iron core, and the stator coil is wound on the coil framework; the stator core is provided with four stator pole teeth which are uniformly distributed on the circumference of the stator core; the coil framework is sleeved on the stator pole teeth; the rotor has four magnetic poles; in a natural state, an included angle of 4-25 degrees is formed between the central axis of the stator pole teeth and the normal of the rotor magnetic poles. The utility model discloses can realize effectively eliminating single-phase brushless motor's start dead zone problem, improve motor efficiency. The balance of the torque is realized by adopting a symmetrical structure and even number of stator pole teeth, so that the noise is reduced, and the unbalance of the torque in one mechanical period of the motor rotor is reduced.

Description

Brushless DC water pump motor with 4-slot 4-pole centralized winding

Technical Field

The utility model relates to a water pump motor technical field, concretely relates to 4 groove 4 utmost points concentrated winding brushless DC water pump motor.

Background

At present, a rotor of a brushless motor on the market comprises a punching sheet, the cross section of the punching sheet is a whole circle, the motor is formed by assembling the punching sheet, a uniform gap is formed between the stator and the rotor, when the motor is in a static state, a permanent magnet in the rotor attracts the stator (a starting dead zone), when the motor is started and rotates, the attraction force of a larger magnet needs to be overcome, the larger the magnetic force is, the larger the loss is, the lower the efficiency of the motor is, the common brushless motor generally has the efficiency of 85-87%, the great waste exists, and an impeller is not arranged on the rotor.

In summary, there is a need for a 4-slot 4-pole centralized winding brushless dc pump motor to solve the problems existing in the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a 4 groove 4 utmost points concentrated winding brushless DC pump motor to solve the brushless motor and start the problem in blind spot.

In order to achieve the purpose, the utility model provides a 4-slot 4-pole concentrated winding brushless DC pump motor, which comprises a stator, a rotor sleeved in the stator and a controller device used for driving the motor to work; the controller device is arranged at one end of the stator;

the stator comprises a stator iron core, a coil framework and a stator coil; the coil framework is sleeved on the stator iron core, and the stator coil is wound on the coil framework;

the stator core is provided with four stator pole teeth which are uniformly distributed on the circumference of the stator core; the coil framework is sleeved on the stator pole teeth; the rotor has four magnetic poles; in a natural state, an included angle of 4-25 degrees is formed between the central axis of the stator pole teeth and the normal line of the rotor.

Preferably, the stator pole teeth are in a Y-shaped asymmetric structure; the distance from the two sides of the stator pole teeth to the circle center of the stator core is unequal.

Preferably, the rotor is made of permanent magnet magnetic powder and plastic through injection molding.

Preferably, an impeller is connected to an end of the rotor, and the impeller rotates with the rotor.

Preferably, the air gap between the stator and the rotor is non-uniform.

Preferably, the length of the magnet on the rotor is larger than that of the stator core, and the two ends of the magnet are 1-4 mm longer than that of the stator core.

Use the technical scheme of the utility model, following beneficial effect has:

(1) the utility model discloses in, stator pole tooth axis becomes 4 ~ 25 degrees contained angles settings with the rotor normal, can realize effectively eliminating single-phase brushless motor's start blind spot problem, has improved motor efficiency.

(2) The utility model discloses in, be equipped with four stator utmost point teeth on the stator core, four stator utmost point tooth evenly distributed adopt symmetrical structure and even number stator utmost point tooth on stator core's circumference, have realized the balance of moment to reduce the noise, reduced the unbalance of moment in a mechanical cycle of electric motor rotor.

(3) The utility model discloses in, the length of magnet is greater than stator core's length on the rotor, and the magnet both ends all are 1 ~ 4mm than stator core length. The motor can bear increased current, increased magnetic flux, reduced magnetic leakage and improved heat capacity.

In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:

FIG. 1 is a schematic view of the overall structure of the motor;

FIG. 2 is a schematic view of a stator structure;

FIG. 3 is a schematic view of a stator core construction;

FIG. 4 is a schematic view of a stator and rotor assembly position;

FIG. 5 is a schematic of stator and rotor dead band positions;

the magnetic control device comprises a stator 1, a stator 11, a stator core 111, stator pole teeth 12, a coil framework 13, a stator coil 2, a rotor 21, a magnet 3, a controller device 4, an impeller, a stator pole tooth central axis A and a rotor pole normal B.

Detailed Description

The embodiments of the invention will be described in detail hereinafter with reference to the accompanying drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.

Example 1:

referring to fig. 1 to 5, a 4-slot 4-pole centralized winding brushless dc pump motor includes a stator 1, a rotor 2 sleeved in the stator 1, and a controller device 3 for driving the motor to work; the controller device 3 is arranged at one end of the stator 1;

the stator 1 comprises a stator iron core 11, a coil framework 12 and a stator coil 13; the coil framework 12 is sleeved on the stator iron core 11, and the stator coil 13 is wound on the coil framework 12;

the stator core 11 is provided with four stator pole teeth 111, and the four stator pole teeth 111 are uniformly distributed on the circumference of the stator core 11; the coil framework 12 is sleeved on the stator pole teeth 111; the rotor 2 has four magnetic poles. The balance of the torque is realized by adopting a symmetrical structure and even number of stator pole teeth, so that the noise is reduced, and the unbalance of the torque in one mechanical period of the motor rotor is reduced.

As shown in fig. 4, in a natural state, an included angle of 4-25 degrees is formed between a central axis a of a stator pole tooth and a normal B of a rotor magnetic pole (an angular bisector of a connecting line between two boundaries of the magnetic pole and an axis of the rotor), so that the problem of a starting dead zone of the single-phase brushless motor can be effectively solved, and the efficiency of the motor is improved.

As shown in fig. 3, the stator teeth 111 have a Y-shaped asymmetric structure; the distances from the two sides of the stator pole teeth 111 to the circle center of the stator core are unequal, namely R1 is not equal to R2.

The rotor 2 is integrally formed by injection molding by taking permanent magnet magnetic powder and plastic as raw materials. The end of the rotor 2 is connected with an impeller 4, and the impeller 4 rotates along with the rotor 2. The air gap between the stator 1 and the rotor 2 is not uniform.

The length of magnet 21 is greater than stator core 11's length on the rotor, and magnet 21 both ends all are longer than stator core 111 ~ 4 mm. The motor can bear increased current, increased magnetic flux, reduced magnetic leakage and improved heat capacity.

Principle of eliminating dead zone: after being magnetized, the permanent magnet rotors are all provided with magnetism, namely N, S poles. In a natural state, the pole teeth of the stator and the rotor magnetic poles attract each other in the largest area, that is, the central axis a of the pole teeth of the stator coincides with the normal B of the rotor magnetic poles, that is, the area where the N pole and the S pole attract each other is the largest, which is also called a dead point, as shown in fig. 5. When the rotor is started, the attraction force between the rotor and the rotor needs to be overcome so as to enable the rotor to rotate. I.e. to overcome the starting torque, more pulsating torque than itself, i.e. to overcome their previous mutual attraction. The larger the attraction area is, the larger the attraction between the N-pole and the S-pole is. In order to reduce the attraction area between the two, the design is that the gap is enlarged, namely the air gap is enlarged, and the attraction force is reduced. In the natural state, the center of the rotor magnetic pole and the center of the stator pole tooth do not coincide on a central axis, i.e., are offset by an angle α (as shown in fig. 4). When the motor is electrified and started, the starting torque of the rotor is easier to overcome the pulse vibration torque of the rotor, so that the rotor of the motor rotates to output the torque.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A4-slot 4-pole centralized winding brushless direct-current water pump motor is characterized by comprising a stator (1), a rotor (2) sleeved in the stator (1) and a controller device (3) used for driving the motor to work; the controller device (3) is arranged at one end of the stator (1);

the stator (1) comprises a stator iron core (11), a coil framework (12) and a stator coil (13); the coil framework (12) is sleeved on the stator iron core (11), and the stator coil (13) is wound on the coil framework (12);

the stator core (11) is provided with four stator pole teeth (111), and the four stator pole teeth (111) are uniformly distributed on the circumference of the stator core (11); the coil framework (12) is sleeved on the stator pole teeth (111); the rotor (2) has four magnetic poles; in a natural state, an included angle of 4-25 degrees is formed between the central axis of the stator pole teeth (111) and the normal of the magnetic pole of the rotor (2).

2. A 4-slot 4-pole concentrated winding brushless dc pump motor according to claim 1, wherein the stator pole teeth (111) are Y-shaped asymmetric structures; the distances from the two sides of the stator pole teeth (111) to the circle centers of the stator iron cores are unequal.

3. A 4-slot 4-pole concentrated winding brushless dc pump motor according to claim 1, characterized in that the end of the rotor (2) is connected with an impeller (4), and the impeller (4) rotates with the rotor (2).

4. A 4-slot 4-pole concentrated winding brushless dc pump motor according to claim 1, characterized in that the air gap between the stator (1) and the rotor (2) is not uniform.

5. The brushless DC water pump motor with 4-slot and 4-pole centralized winding as claimed in claim 1, wherein the length of the magnet (21) on the rotor is greater than that of the stator core (11), and both ends of the magnet (21) are 1-4 mm longer than the stator core (11).