CN110768415A

CN110768415A - Ultra-high speed motor

Info

Publication number: CN110768415A
Application number: CN201910956681.1A
Authority: CN
Inventors: 张国华; 张琪
Original assignee: Shenzhen Hengdriver Motor Co Ltd
Current assignee: Shenzhen Hengdriver Motor Co Ltd
Priority date: 2019-10-10
Filing date: 2019-10-10
Publication date: 2020-02-07

Abstract

The invention discloses an ultra-high speed motor, which comprises a motor body, a stator assembly and a rotor assembly, wherein the stator assembly is arranged on the motor body; the stator assembly comprises a circular four-slot stator core and an injection molding integrated insulating support or an upper and lower insulating support; the motor body comprises a stator chamber, a bearing chamber and a shell, wherein the stator chamber is used for fixing a stator assembly, the bearing chamber is used for fixing a rotor assembly, a stator ventilation groove is formed in the stator chamber, the rotor assembly comprises a shaft, a magnet, a bearing, a gasket, a spring and a fan blade, and a Z-shaped sealing cavity is formed by a concave part at the bottom end of the fan blade and a convex part of the motor body. The device air outlet department does not have any and blocks, has improved the unobstructed in motor wind channel, and this when making the motor operation, furthest's reduction vibration and noise to improve the life-span, can improve magnet under the rotational speed of superelevation, can not break and drop because of centrifugal force, block foreign matter such as dust, hair that the air current carried and get into the bearing, cause the dead damage of bearing card, thereby improve the motor life-span.

Description

Ultra-high speed motor

Technical Field

The invention relates to an ultra-high speed motor, and belongs to the technical field of high-rotating-speed brushless motors.

Background

With the advent of intelligent society, people have a higher pursuit for quality of life. In the field of consumer products, people increasingly expect that products are more miniaturized while having high performance, so that a power part motor needs to be designed in an innovative mode, the requirement for high performance is met while light weight and miniaturization are achieved, and the service life of the motor is not reduced and the cost is not increased.

Disclosure of Invention

The invention discloses a novel ultra-high-speed motor, which comprises a stator assembly, a rotor assembly and a motor body; the motor body comprises a stator chamber, a bearing chamber and a shell, wherein the stator chamber and the bearing chamber are fixed on the shell through at least 3 reinforcing ribs. The stator chamber in the motor body is used for fixing a stator assembly, and the stator assembly comprises a circular four-slot stator core and an injection molding integrated insulating support or an upper and lower insulating support. The motor body comprises a bearing chamber concentric with the stator chamber and used for fixing the rotor assembly; the rotor assembly comprises a shaft, a magnet, a bearing, a gasket, a spring and a fan blade;

the stator assembly is fixed in the stator chamber of the motor body in one or a combination mode of interference fit and adhesive, the design ensures that the air outlet of the motor is not blocked, the smoothness of the motor air duct is improved, and the vibration and the noise are reduced to the maximum extent when the motor runs, and the service life is prolonged.

In the rotor assembly, a shaft, a magnet, a bearing, a gasket, a spring and a fan blade are assembled in sequence, wherein at least one annular groove is formed in the joint of the shaft and the magnet, more adhesive can be stored in the annular groove, the shaft and the magnet are tightly connected, and the strength and the connection fastening degree of the magnet are improved in a phase-changing manner. Therefore, the magnet can be prevented from being broken and falling off due to centrifugal force under the condition of ultrahigh rotating speed.

The fan blade comprises a hub with an inner concave part and an outer convex part and a peripheral blade, the concave part of the fan blade and the convex part of the motor body form a Z-shaped sealing cavity, when the fan blade rotates to generate airflow, foreign matters such as dust and hair carried by the airflow are prevented from entering the bearing, the bearing is prevented from being locked and damaged, and the service life of the motor is prolonged.

A stator ventilation groove is designed in a stator chamber of the motor body and is communicated with the interior of the stator chamber and the shell. The air flow generated by the rotation of the fan blades ventilates the coils on the stator from the inside of the casing through the ventilation slots and takes away the heat accumulated in the stator, thereby greatly reducing the temperature rise of the magnets in the stator and prolonging the service life of the motor.

Drawings

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. The drawings comprise:

fig. 1 is an exploded perspective view of a motor;

FIG. 2 is an exploded perspective view of a stator assembly of the electric machine;

FIG. 3 is a cross-sectional view of a motor body of the motor;

FIG. 4 is a cross-sectional view assembled through the motor of FIG. 1;

Detailed Description

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Fig. 1 is an exploded perspective view of the present motor. The motor comprises a stator assembly 16, a motor body 4 and a rotor assembly 17.

As shown in fig. 2, the scoop terminal 6, the wiring board 5, the wire bonding column 3, the insulating support 2, and the stator core 1 form a stator assembly 16. The stator core 1 in the stator assembly 16 can be integrated with the insulating support 2 through injection molding, and then the whole body is provided with the winding, so that the direct contact between the winding with high voltage and the stator core 1 can be isolated to the greatest extent. The winding head and tail end are connected with the welding wire column 3 in a winding and welding mode, then are connected with the welding wire column 3 through the wiring board 5, and finally the shovel-shaped terminal 6 is welded on the wiring board 5, so that the driver can be directly connected to the shovel-shaped terminal 6 to drive the motor. In this way, the voltage output by the drive plate can be simply and reliably input to the motor winding through the form of the terminal.

The stator core 1 of the stator assembly 16 is secured in the stator chamber 20 of the motor body 4 using one or more of an adhesive or an interference fit. Together with the stator chamber 20, the bearing chamber 21, once turned, is used to secure the rotor assembly 17, again using one or more of an adhesive or an interference fit. The innovation of the assembly mode is that the stator chamber 15 and the bearing chamber 16 are machined by one-time turning, which greatly improves the concentricity of the rotor and the stator of the motor. Reduce the running noise of motor, improve the life of motor.

As shown in fig. 3, in the embodiment, the stator chamber 20 and the bearing chamber 21 are supported by the reinforcing ribs 19 and fixed on the casing 22, and are integrated into the motor body 4. Meanwhile, not only the structure is limited, in this embodiment, the stator chamber 20, the bearing chamber 21 and the reinforcing ribs 19 may be constructed as a whole, and then the stator chamber, the bearing chamber and the reinforcing ribs are fixedly connected with the casing 22 by interference fit to form the motor body 4.

At least one annular ventilation groove 15 is formed in the stator chamber 20 in the motor body 4, and the annular ventilation groove 15 is communicated with the stator chamber 20 and the interior of the machine shell 22. When the motor is running, the fan blades 12 rotate to generate airflow, the airflow flows along the interior of the casing 22 and ventilates the coils on the stator 16 through the annular ventilating slots 15, and heat accumulated in the interior of the stator 16 is taken away, so that the temperature rise of the magnet 7 is greatly reduced. Therefore, the defect that the magnet 7 is made of a permanent magnet material and is easy to demagnetize at high temperature is overcome, the running stability of the motor is improved, and the service life of the motor is prolonged.

The motor body 4 is made of zinc alloy, so that the requirement of motor strength is met, and the noise of the motor is weakened by utilizing the characteristic that the zinc alloy transmits sound passivity.

The rotor assembly 17 is formed by fixing the magnet 7, the two bearings 10, the two gaskets 8, the spring 11 and the fan blade 12 on the rotating shaft 9 in sequence by using an adhesive or in an interference fit mode.

In the rotor assembly 17, two deep groove ball bearings 10 are fixed in a bearing chamber 21 of the motor body 4 by one of adhesive or interference fit and combination thereof.

In the rotor assembly 17, the connection part of the shaft 9 and the magnet 7 is provided with at least one annular groove 14, more adhesive can be stored in the annular groove 14, the shaft 9 and the magnet 7 are tightly connected, and the strength and the connection fastening degree of the magnet 7 are improved in a phase change manner. Therefore, the magnet 7 can be prevented from being broken or falling off due to centrifugal force under the condition of ultrahigh rotating speed.

The function of the washer 8 and the spring 11 is to apply the elastic force of the spring 11 to the outer rings of the two bearings 10, so as to apply a pre-tightening force to the two bearings 10. As is known, the ball bearing is applied with proper pretightening force in use, so that the service life of the bearing can be prolonged, and the rotation noise of the bearing can be reduced.

The magnet 7 is made of bonded neodymium iron boron, and the number of poles of the magnet 7 is 4, but the material and the number of poles are not limited thereto.

The fan blades 12 are made of aluminum alloy, and have the advantages of higher strength and lighter weight compared with aluminum. The fan blade is provided with a hub which is concave and convex and peripheral blades, wherein the peripheral blades comprise 13 blades which are processed by CNC.

Fig. 4 shows that the concave part of the hub in the fan blade 12 and the convex part of the motor body form a Z-shaped sealing cavity 18, when the fan blade rotates to generate airflow, foreign matters such as dust and hair carried by the airflow are prevented from entering the bearing, so that the bearing is blocked and damaged, and the service life of the motor is prolonged.

Claims

1. An ultra high speed motor comprising a stator assembly (16), a rotor assembly (17) and a motor body (4), characterized in that: the stator assembly (16) comprises a circular four-slot stator core (1) and an injection molding integrated insulation support (2), wherein the circular four-slot stator core (1) is connected with the injection molding integrated insulation support (2) in an injection molding mode;

the rotor assembly (17) comprises a shaft (9), a magnet (7), a bearing (10), a gasket (8), a spring (11) and fan blades (12), wherein the shaft (9) is used as a main body, and the rest rotor components are fixed on the shaft (9) in sequence through one or the combination of interference fit and adhesive;

the motor body (4) comprises a stator chamber (20), a bearing chamber (21) and a machine shell (22), the stator chamber (20) is fixedly connected with a stator assembly (16), the bearing chamber (21) is fixedly connected with a rotor assembly (17), reinforcing ribs (19) are arranged among the stator chamber (20), the bearing chamber (21) and the machine shell (22), at least one annular ventilating groove (15) is arranged inside the stator chamber (20), the annular ventilating groove (15) is communicated with the stator chamber (20) and the machine shell (22) inside, the fan blade (12) is provided with a hub and peripheral blades (13) which are concave and convex, and a Z-shaped sealing cavity (18) is formed by a concave part of the hub and a convex part of the motor body.

2. An ultra high speed motor according to claim 1, wherein: the stator assembly (16) is embedded in a stator chamber (20) of the motor body (4).

3. An ultra high speed motor according to claim 1, wherein: the circular four-slot iron core (1) is assembled in the stator chamber (20) through one or a combination of interference fit and adhesive.

4. An ultra high speed motor according to claim 1, wherein: the stator chamber (20) and the bearing chamber (21) in the motor body (4) are fixed on the casing (22) through at least 3 reinforcing ribs (19).

5. An ultra high speed motor according to claim 1, wherein: the annular ventilation groove (15) in the stator chamber (20) is arranged at the bottom of the stator chamber (20).

6. An ultra high speed motor according to claim 1, wherein: the fan blade (12) is made of aluminum alloy T6061, and the peripheral blade of the fan blade comprises 13 blades and is formed by CNC machining.