CN212115050U

CN212115050U - Rotor structure of small brushless direct current motor

Info

Publication number: CN212115050U
Application number: CN202022025780.9U
Authority: CN
Inventors: 封东莲
Original assignee: GUANGZHOU SUN EMPEROR INTELLIGENT TECHNOLOGY CO LTD
Current assignee: GUANGZHOU SUN EMPEROR INTELLIGENT TECHNOLOGY CO LTD
Priority date: 2020-09-16
Filing date: 2020-09-16
Publication date: 2020-12-08
Anticipated expiration: 2030-09-16

Abstract

The utility model discloses a rotor structure of a small brushless DC motor, which comprises a rotor shaft corresponding to a stator winding position, a magnet component which can be detachably arranged is matched and arranged outside the rotor shaft, a first positioning shaft is coaxially arranged at the right end of the rotor shaft, a first transmission shaft is coaxially arranged at the right end of the first positioning shaft, a second positioning shaft is coaxially arranged at the left end of the rotor shaft, a second transmission shaft is coaxially arranged at the left end of the second positioning shaft, a second cavity for air intake is arranged at the left end of the second transmission shaft, the second cavity extends into the rotor shaft, a plurality of cold air discharge ports communicated with the second cavity are arranged on the left side surface of the rotor shaft, the utility model is designed aiming at the defects of the prior device, a detachable magnet component is arranged, the later maintenance of the device is convenient, and a heat dissipation component for promoting the quick replacement of the inside and outside air is arranged, the heat dissipation effect of the device is effectively improved, the working performance of the device is guaranteed, and the practicability is high.

Description

Rotor structure of small brushless direct current motor

Technical Field

The utility model relates to a brushless motor technical field specifically is a small-size brushless DC motor's rotor structure.

Background

The brushless direct current motor is composed of a motor main body and a driver, and is a typical electromechanical integration product. Because the brushless DC motor is operated in a self-control mode, a starting winding is not additionally arranged on a rotor like a synchronous motor which is started under the condition of heavy load under the condition of frequency conversion and speed regulation, and oscillation and step-out can not be generated when the load suddenly changes. The permanent magnet of the brushless DC motor with medium and small capacity is mostly made of rare earth neodymium iron boron (Nd-Fe-B) material with high magnetic energy level. Therefore, the volume of the rare earth permanent magnet brushless motor is reduced by one machine seat number compared with that of a same-capacity three-phase asynchronous motor.

Brushless DC motor is the important component of electric tool, and in this field, present motor rotor subtracts heavy allowance when subtracting heavy balanced technology little, and the balanced degree of difficulty of the permanent magnet on the motor rotor is big to the motor has produced very big vibration and noise when moving, and the setting of this kind of rotor leads to the inside heat of motor can't get rid of, is unfavorable for improving the life of device, and to above-mentioned problem, provides a small-size brushless DC motor's rotor structure now.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a small-size brushless DC motor's rotor structure to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

a rotor structure of a small brushless direct current motor comprises a rotor shaft corresponding to a stator winding position, a magnet component which can be detachably arranged is arranged on the outer side of the rotor shaft in a matched mode, a first positioning shaft is coaxially arranged at the right end of the rotor shaft, a first transmission shaft is coaxially arranged at the right end of the first positioning shaft, a second positioning shaft is coaxially arranged at the left end of the rotor shaft, a second transmission shaft is coaxially arranged at the left end of the second positioning shaft, a second cavity used for air intake is arranged at the left end of the second transmission shaft, the second cavity extends into the rotor shaft, a plurality of cold air discharge ports communicated with the second cavity are formed in the left side face of the rotor shaft, blades used for pushing airflow to enter are arranged at the left end of the second transmission shaft, a first cavity is arranged inside the first transmission shaft, one end of the first cavity extends into the rotor shaft, a hot air inlet communicated with the first cavity is formed in the right side of the rotor shaft, an exhaust port communicated with the first cavity is formed in the outer side of the first transmission shaft.

As a further aspect of the present invention: the air inlet component for assisting air flow entering is further arranged at the end part of the second transmission shaft, the air inlet component comprises a guide cover which is arranged at the outer end of the second transmission shaft in a sliding mode, a blocking ring used for abutting against the guide cover is arranged at the left end of the second transmission shaft, a threaded area is arranged on the left side of the second transmission shaft, a threaded positioning ring used for abutting against the guide cover and the blocking ring is arranged on the threaded area in a rotating mode, and the air flow pushing plate used for driving air flow to enter is distributed at the left end opening of the guide cover in an array mode.

As a further aspect of the present invention: the magnet part comprises mounting grooves distributed on the outer side of the rotor shaft in an array mode, a permanent magnet is arranged in each mounting groove in a matched mode, a threaded area is arranged on the rotor shaft on one side of each mounting groove, a fixing ring is arranged at the position of the threaded area in a matched mode, a pressing inclined plane is arranged at the left end of the fixing ring, and a slope surface matched with the pressing inclined plane is arranged at the corner position of the right end of each permanent magnet.

As a further aspect of the present invention: and a plurality of pre-tightening bulges are distributed on the inner wall of the abutting inclined plane in an array manner.

As a further aspect of the present invention: and a friction ring which is in abutting contact with the surface of the air guide sleeve and is used for limiting the rotation of the air guide sleeve is arranged on the left side of the baffle ring.

As a further aspect of the present invention: a filter screen for filtering air is arranged in the air guide sleeve.

As a further aspect of the present invention: the interior of the fixing ring is provided with a metal ring which is annularly arranged.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses drawback to current device designs, has set up detachable magnet part, has made things convenient for the maintenance to the device later stage, has set up the radiating part that promotes inside and outside air quick replacement, the effectual radiating effect who improves the device has guaranteed the working property of device, and the practicality is strong.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of the internal structure of the present invention.

Fig. 3 is a schematic structural view of the middle dome of the present invention.

Fig. 4 is a schematic structural view of the middle fixing ring of the present invention.

Wherein: the rotor comprises a rotor shaft 11, a first positioning shaft 12, a first transmission shaft 13, an exhaust port 14, a first cavity 15, a hot gas inlet 16, a mounting groove 17, blades 18, a baffle ring 19, a flow guide cover 20, an airflow pushing plate 21, a threaded positioning ring 22, a second transmission shaft 23, a second positioning shaft 24, a second cavity 25, a cold air exhaust port 26, a permanent magnet block 27, a fixing ring 28, a metal ring 29, a pressing inclined surface 30 and a pre-tightening bulge 31.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-4, in an embodiment of the present invention, a rotor structure of a small brushless dc motor includes a rotor shaft 11 corresponding to a position of a stator winding, a magnet component detachably disposed outside the rotor shaft 11 is cooperatively disposed, the detachable configuration facilitates later maintenance, a first positioning shaft 12 is coaxially disposed at a right end of the rotor shaft 11, a first transmission shaft 13 is coaxially disposed at a right end of the first positioning shaft 12, a second positioning shaft 24 is coaxially disposed at a left end of the rotor shaft 11, a second transmission shaft 23 is coaxially disposed at a left end of the second positioning shaft 24, a second chamber 25 for air intake is disposed at a left end of the second transmission shaft 23, the second chamber 25 extends into the rotor shaft 11, a plurality of cold air discharge ports 26 communicated with the second chamber 25 are disposed on a left side of the rotor shaft 11, blades 18 for pushing an air flow to enter are disposed at left port of the second transmission shaft 23, a first cavity 15 is arranged inside the first transmission shaft 13, one end of the first cavity 15 extends into the rotor shaft 11, a hot air inlet 16 communicated with the first cavity 15 is formed in the right side of the rotor shaft 11, and an air outlet 14 communicated with the first cavity 15 is formed in the outer side of the first transmission shaft 13;

when the motor works, the rotor shaft 11 can rotate under the driving of the stator winding, the blade 18 positioned at the left end of the second transmission shaft 23 can rotate along with the second transmission shaft, so that external airflow is driven to enter along the second cavity 25 and then is sprayed into the motor shell from the cold air outlet 26, the interior of the motor shell is cooled, cooled air can enter the first cavity 15 along the hot air inlet 16, then flows to the right side along the first cavity 15 and finally is sprayed out from the air outlet 14, and therefore hot air in the motor is replaced quickly by the rotation of the rotor, and the working performance of the motor is effectively guaranteed;

in order to promote the flow of air current, the end part of the second transmission shaft 23 is further provided with an air inlet part for assisting air current to enter, the air inlet part comprises a guide cover 20 which is slidably sleeved at the outer end of the second transmission shaft 23, the left end of the second transmission shaft 23 is provided with a retaining ring 19 for abutting against the guide cover 20, the left side of the second transmission shaft 23 is provided with a threaded area, the threaded area is spirally provided with a threaded positioning ring 22 for abutting against the guide cover 20 and the retaining ring 19, the left side of the retaining ring 19 is provided with a friction ring which is in abutting contact with the surface of the guide cover 20 and used for limiting the rotation of the guide cover, the left port array of the guide cover 20 is distributed with an air current pushing plate 21 for driving air current to enter, a filter screen for filtering air is arranged inside the guide cover 20, and the air is filtered by the filter;

the magnetic component comprises mounting grooves 17 distributed on the outer side of the rotor shaft 11 in an array manner, a permanent magnet 27 is arranged in each mounting groove 17 in a matching manner, a threaded area is arranged on the rotor shaft 11 on one side of the mounting groove 17, a fixing ring 28 is arranged at the threaded area in a matching manner, a pressing inclined plane 30 is arranged at the left end of the fixing ring 28, a slope surface matched with the pressing inclined plane 30 is arranged at the corner position of the right end of the permanent magnet 27, a plurality of pre-tightening protrusions 31 are distributed on the inner wall of the pressing inclined plane 30 in an array manner, during mounting, the permanent magnet 27 is inserted into the mounting groove 17, then the fixing ring 28 is rotated to extrude the permanent magnet 27 through the fixing ring 28, so that the pressing inclined plane 30 is in pressing contact with the slope surface of the permanent magnet 27, the pre-tightening protrusions 31 can be;

the fixing ring 28 is internally provided with a metal ring 29 which is annularly arranged, and the adsorption force between the metal ring 29 and the permanent magnet block 27 is utilized, so that the compressing effect is improved.

The utility model discloses a theory of operation is: during the in-service use, run through motor housing with rotor shaft 11 inside, all rotate with motor housing through the bearing on rotor shaft 11 and the second location axle 24 and be connected, under stator winding's effect, rotor shaft 11 can rotate inside motor housing, the blade 18 that is located the 23 left ends of second transmission shaft can rotate thereupon, thereby drive external air current and get into along second cavity 25, then spout motor housing inside from air conditioning row mouth 26, thereby to motor housing inside cooling operation, air after the cooling can get into first cavity 15 along hot gas inlet 16, then flow to the right side along first cavity 15, spout in last follow gas vent 14, just so utilize the rotor to rotate and come the inside hot-air of quick replacement motor, can change permanent magnet 27 through the magnet part at later stage, thereby improve rotor shaft 11's balanced degree.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A rotor structure of a small brushless direct current motor comprises a rotor shaft (11) corresponding to a stator winding, wherein a magnet component which is detachably arranged is arranged on the outer side of the rotor shaft (11) in a matched mode, a first positioning shaft (12) is coaxially arranged at the right end of the rotor shaft (11), and a first transmission shaft (13) is coaxially arranged at the right end of the first positioning shaft (12);

it is characterized in that the left end of the rotor shaft (11) is coaxially provided with a second positioning shaft (24), a second transmission shaft (23) is coaxially arranged at the left end of the second positioning shaft (24), a second chamber (25) for air inlet is arranged at the left end of the second transmission shaft (23), the second chamber (25) extends to the inside of the rotor shaft (11), the left side surface of the rotor shaft (11) is provided with a plurality of cold air discharge openings (26) communicated with the second chamber (25), a left port of the second transmission shaft (23) is provided with a blade (18) for pushing airflow to enter, a first chamber (15) is arranged in the first transmission shaft (13), one end of the first chamber (15) extends into the rotor shaft (11), the right side of the rotor shaft (11) is provided with a hot air inlet (16) communicated with the first cavity (15), an exhaust port (14) communicated with the first cavity (15) is formed in the outer side of the first transmission shaft (13).

2. The rotor structure of the small brushless DC motor according to claim 1, wherein the end of the second transmission shaft (23) is further provided with an air inlet component for assisting air flow to enter, the air inlet component comprises a guide cover (20) slidably sleeved at the outer end of the second transmission shaft (23), the left end of the second transmission shaft (23) is provided with a retaining ring (19) for pressing against the guide cover (20), the left side of the second transmission shaft (23) is provided with a threaded area, the threaded area is provided with a threaded positioning ring (22) for pressing the guide cover (20) against the retaining ring (19) in a rotating manner, and the left port array of the guide cover (20) is distributed with an air flow pushing plate (21) for driving air flow to enter.

3. The rotor structure of small brushless DC motor according to claim 1, wherein the magnet member comprises mounting slots (17) distributed in an array on the outer side of the rotor shaft (11), each mounting slot (17) is provided with a permanent magnet (27) in a matching manner, the rotor shaft (11) on one side of the mounting slot (17) is provided with a threaded area where a fixing ring (28) is arranged in a matching manner, the left end of the fixing ring (28) is provided with a pressing inclined plane (30), and the right end corner of the permanent magnet (27) is provided with a slope surface matching with the pressing inclined plane (30).

4. The rotor structure of small brushless DC motor according to claim 3, characterized in that the inner wall of the pressing slope (30) is further distributed with a plurality of pre-tightening protrusions (31) in array.

5. The rotor structure of a small brushless dc motor according to claim 2, wherein the baffle ring (19) is provided at its left side with a friction ring in press contact with the surface of the air guide sleeve (20) for restricting its rotation.

6. The rotor structure of a small brushless dc motor according to claim 2, wherein a filter screen for filtering air is provided inside the air guide sleeve (20).

7. The rotor structure of a small brushless dc motor according to claim 3, characterized in that the stationary ring (28) is internally provided with a metal ring (29) arranged annularly.