CN212162977U

CN212162977U - Brushless DC motor with enclosed stator

Info

Publication number: CN212162977U
Application number: CN202021095774.4U
Authority: CN
Inventors: 强余春; 范维英; 吴韶伟; 王毅杰; 陆晶
Original assignee: SHANGHAI LIUSHENG MOTOR CO Ltd
Current assignee: SHANGHAI LIUSHENG MOTOR CO Ltd
Priority date: 2020-06-15
Filing date: 2020-06-15
Publication date: 2020-12-15
Anticipated expiration: 2030-06-15

Abstract

The utility model provides a stator confined brushless DC motor, includes the casing, is provided with stator and circuit board in the casing, and stator and circuit board are wrapped up completely by rust-resistant isolation layer and are sealed, and the clearance packing between stator and the circuit board has rust-resistant isolation filler, and the cooperation is provided with the rotor in the stator, and one side of casing is provided with the front end housing, and the opposite side of casing is provided with the rear end cap, and front end housing and rear end cap all with casing sealing connection. The utility model discloses a brushless DC motor that stator confined adopts unsaturated polyester bulk membrane plastics die-casting casing. The gaps between the stator and the circuit board are filled with the bulk film plastic, so that the moisture resistance and the corrosion resistance are good, and in the same salt spray test environment, the structure of the fully-closed stator made of the bulk film plastic material can be used for 500 hours without generating any rust, thereby greatly reducing the influence of an extremely humid environment on the normal operation of the motor.

Description

Brushless DC motor with enclosed stator

Technical Field

The utility model relates to the field of electric machines, especially, relate to micro motor technique, specifically a stator confined brushless DC motor.

Background

The miniature DC motor applied to the air conditioner draining pump and the convection fan of the refrigerator and freezer uses stator components formed by stamping and laminating silicon steel sheets. Among the prior art, stator magnetic induction part exposes outside, if stator module does not do surface treatment, micro motor uses under humid environment, and in the short time, rust point and rust spot just appear on the stator surface, and the rust spot can enlarge gradually and the thickening along with time, not only can appear the rust and spill over, more can make the rust touch the rotor and produce the rotation and interfere, makes the motor appear unusual noise and hinders the motor even and move.

In order to prevent the motor stator from rusting, the method of the common miniature direct current motor is to perform surface treatment on the stator component, and the most common surface treatment is to spray surface anti-rust paint or make surface electrophoretic paint of the stator.

The surface treatment method has the defects that the processing of the anti-rust paint and the electrophoretic paint seriously pollutes the environment, and the anti-rust paint and the electrophoretic paint cannot completely prevent rust in a severe environment and a long-time salt spray test.

Salt spray test results show that rust spots and rusty spots of different degrees can appear in the stator assembly which is subjected to standard surface treatment after 72 hours of the salt spray test. If the surface treatment has defects such as thickness difference, pinholes, surface peeling and the like, rust spots and rusty spots can appear after 24 hours of the salt spray test.

In practical applications, surface treatment imperfections are difficult to detect visually at low cost. When the surface treatment process is applied to a central air-conditioning drainage pump and a convection fan of a refrigerator freezer, the service performance and the service life of the electrical appliances are actually directly influenced due to the fact that the electrical appliances are operated for a long time and the service life is expected.

Disclosure of Invention

An object of the utility model is to provide a stator confined brushless DC motor, this kind of stator confined brushless DC motor solve among the prior art motor and use the stator of motor under the humid environment rust point and rust spot influence the technical problem of motor normal operating easily appear.

The utility model discloses a stator confined brushless DC motor, which comprises a housing, the casing in be provided with stator and circuit board, stator and circuit board electric connection, stator and circuit board wrap up completely by rust-resistant isolation layer and seal, stator and circuit board between the clearance packing have rust-resistant isolation filler, the stator in the cooperation be provided with the rotor, one side of casing be provided with the front end housing, the opposite side of casing be provided with the rear end cap, front end housing and rear end cap all with casing sealing connection, the both ends of rotor set up respectively in front end housing and rear end cap through the bearing, the one end of rotor extend to the front end housing outside.

Preferably, the casing is made of unsaturated polyester bulk film plastic.

Preferably, the antirust isolation layer and the antirust isolation filler are both made of unsaturated polyester bulk film plastic.

Preferably, the front end cover and the rear end cover are both made of SPCC cold rolled steel, and the surface of the front end cover and the rear end cover is provided with a zinc-nickel alloy coating.

Preferably, front end housing and rear end housing all include first lid shell and second lid shell respectively, the bearing establish between first lid shell and second lid shell by the pressure spring card, the bearing be oil-retaining bearing, the bearing on the cover be equipped with the oil storage felt, bearing and second lid shell between be provided with wear-resisting gasket.

Preferably, the rotor is a plastic magnetic steel rotor.

Preferably, a wear-resistant gasket is arranged between the rotor and the front end cover.

Compared with the prior art, the utility model, its effect is positive and obvious. The utility model discloses a brushless DC motor that stator confined adopts unsaturated polyester bulk membrane plastics die-casting casing. The gaps between the stator and the circuit board are filled with the bulk film plastic, so that the moisture resistance and the corrosion resistance are good, the motor is not easy to generate rusty spots and rusty spots when being applied to the stator in a humid environment, and in the same salt spray test environment, the structure of the stator is completely closed by using the bulk film plastic material, so that the motor can continuously generate 500 hours without generating any rusty spots. Thereby greatly reducing the influence of the extreme humid environment on the normal operation of the motor.

Drawings

Fig. 1 is a schematic structural diagram of a stator-enclosed brushless dc motor according to the present invention.

Fig. 2 is an exploded schematic view of a stator-enclosed brushless dc motor according to the present invention.

Fig. 3 is a schematic view of an exploded structure of a stator-enclosed brushless dc motor according to the present invention.

Fig. 4 is an exploded schematic view of a front end cover of a brushless dc motor with a closed stator according to the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and embodiments, but the present invention is not limited to this embodiment, and the protection scope of the present invention should be included in all similar structures and similar variations thereof.

Example 1

As shown in fig. 1, fig. 2, fig. 3 and fig. 4, the utility model discloses a stator confined brushless dc motor, including casing 1, casing 1 in be provided with stator 2 and circuit board 3, stator 2 and circuit board 3 electric connection, stator 2 and circuit board 3 wrap up totally by rust-resistant isolation layer and seal, stator 2 and circuit board 3 between the clearance packing have rust-resistant isolation filler, stator 2 in the cooperation be provided with rotor 4, one side of casing 1 be provided with front end housing 5, the opposite side of casing 1 be provided with rear end housing 6, front end housing 5 and rear end housing 6 all with casing 1 sealing connection, the both ends of rotor 4 set up respectively in front end housing 5 and rear end housing 6 through bearing 7, the one end of rotor 4 extend to the front end housing 5 outside.

Preferably, the housing 1 is made of unsaturated polyester bulk film plastic.

Preferably, the front end cover 5 and the rear end cover 6 are both made of SPCC cold rolled steel, and the surface of the front end cover and the rear end cover is provided with a zinc-nickel alloy coating.

Preferably, the front end cover 5 and the rear end cover 6 respectively comprise a first cover shell 51 and a second cover shell 52, the bearing 7 is clamped between the first cover shell 51 and the second cover shell 52 by a pressure spring 8, the bearing 7 is an oil-containing bearing, the bearing 7 is sleeved with an oil storage felt 9, and a wear-resistant gasket 10 is arranged between the bearing 7 and the second cover shell 52.

Preferably, the rotor 4 is a plastic magnetic steel rotor 4.

Preferably, a wear-resistant gasket 11 is arranged between the rotor 4 and the front end cover 5.

The working principle of the embodiment is as follows:

the unsaturated polyester bulk film plastic is adopted to die-cast the shell 1, the front end cover 5, the rear end cover 6, the circuit board 3 and the rotor 4, and the shell, the front end cover 5, the rear end cover 6, the circuit board 3 and the rotor are assembled, clamped, fastened and hermetically connected, the circuit board 3 is the inverter circuit board 3, and gaps between the stator 2 and the inverter circuit board 3 are filled with bulk film plastic, so that the moisture resistance and the corrosion resistance are good. In the same salt spray test environment, the structure of the stator 2 is completely closed by the bulk film plastic material, and the rust can be continuously generated for 500 hours without any rust. The inverter circuit board 3 carries a driving chip of a high-performance three-phase sine wave technology, and compared with the traditional trapezoidal wave driving technology, the running efficiency of the micro motor can be improved by 10% -20%, and the efficiency lost due to the increase of the magnetic gap distance is compensated. The fractional-slot concentrated winding stator 2 is 9 slots and 10 poles, the number of slots of each pole per phase is =1/2, and three-phase Y-shaped winding distribution wiring is achieved. The circuit board 3 is provided with a three-phase brushless motor driving chip BD63281A based on sine wave technology from ROHM corporation. The front end cover 5 and the rear end cover 6 are of a closed structure with an oil-retaining bearing 7, have the functions of sound absorption and vibration reduction and are low in noise; the reasonable fractional slot concentrated stator 2 matched with the pole slot is combined with the inverter circuit board 3 provided with the three-phase brushless motor driving chip of the sine wave technology to form a motor control system, so that the motor control system has good controllability and high efficiency.

Claims

1. A stator-enclosed brushless DC motor, characterized in that: comprises a casing (1), a stator (2) and a circuit board (3) are arranged in the casing (1), the stator (2) is electrically connected with the circuit board (3), the stator (2) and the circuit board (3) are completely wrapped and sealed by an antirust isolation layer, the gap between the stator (2) and the circuit board (3) is filled with antirust isolation filler, a rotor (4) is arranged in the stator (2) in a matching way, a front end cover (5) is arranged at one side of the casing (1), the other side of the shell (1) is provided with a rear end cover (6), the front end cover (5) and the rear end cover (6) are both connected with the shell (1) in a sealing way, two ends of the rotor (4) are respectively arranged in the front end cover (5) and the rear end cover (6) through bearings (7), one end of the rotor (4) extends to the outer side of the front end cover (5).

2. A stator enclosed brushless dc motor according to claim 1, wherein: the shell (1) is made of unsaturated polyester bulk film plastic.

3. A stator enclosed brushless dc motor according to claim 1, wherein: the antirust isolation layer and the antirust isolation filler are both made of unsaturated polyester bulk film plastic.

4. A stator enclosed brushless dc motor according to claim 1, wherein: the front end cover (5) and the rear end cover (6) are both made of SPCC cold rolled steel, and a zinc-nickel alloy coating is arranged on the surface of the front end cover and the rear end cover.

5. A stator enclosed brushless dc motor according to claim 1, wherein: front end housing (5) and rear end housing (6) all include first lid shell (51) and second lid shell (52) respectively, bearing (7) establish between first lid shell (51) and second lid shell (52) by pressure spring leaf (8) card, bearing (7) be oil bearing, bearing (7) go up the cover and be equipped with oil storage felt (9), bearing (7) and second lid shell (52) between be provided with wear pad (10).

6. A stator enclosed brushless dc motor according to claim 1, wherein: the rotor (4) is a plastic magnetic steel rotor (4).

7. A stator enclosed brushless dc motor according to claim 1, wherein: and a wear-resistant gasket (11) is arranged between one end of the rotor (4) and the front end cover (5).