CN212063755U - Electric tool - Google Patents
Electric tool Download PDFInfo
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- CN212063755U CN212063755U CN202020754050.XU CN202020754050U CN212063755U CN 212063755 U CN212063755 U CN 212063755U CN 202020754050 U CN202020754050 U CN 202020754050U CN 212063755 U CN212063755 U CN 212063755U
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- magnetic bearing
- rotor
- electric tool
- motor
- bearing
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Abstract
The utility model relates to an electric tool, it includes the host computer casing, installs the motor in the host computer casing, and the rotor in the stator is included and arranged in to the motor, and the front and back end of rotor is equipped with preceding magnetic bearing and back magnetic bearing respectively, is equipped with front end sensor and rear end sensor on preceding magnetic bearing and the back magnetic bearing respectively, and one side that preceding magnetic bearing or back magnetic bearing deviate from the rotor is equipped with the axial positioning bearing. The technical scheme is that when the motor runs, the magnetic fields generated by the front magnetic bearing and the rear magnetic bearing of the motor can enable the rotor to be in a suspension state, the alternating magnetic field generated by the stator can drive the rotor to rotate at a high speed in the suspension state, and mechanical friction is not generated between the alternating magnetic field and the front magnetic bearing and between the alternating magnetic field and the rear magnetic bearing during rotation, so that the starting power is greatly reduced, the heating is reduced, the noise is reduced, the conversion efficiency is effectively improved, and the mechanical transmission with larger torque is simpler; meanwhile, the electric tool can be made into a full-sealed structure, so that the electric tool is suitable for special industries (such as chemical industry, underwater operation and the like).
Description
Technical Field
The utility model relates to an electric tool technical field, more specifically say an electric tool.
Background
The electric tool (including garden tool) is widely applied to industries such as gardens, buildings and the like, the motor is one of the most core components of the electric tool, the operation of the electric tool is realized by driving related components through mechanical transmission of the motor, the operation process of the electric tool can be found that due to the structure of the motor, the rotor needs to be supported through the bearing, the rotor generates friction with a contact surface of the bearing in a high-speed rotation process to generate heat and noise, the heat cannot be effectively utilized, the working efficiency of the electric tool is reduced, the service lives of the bearing and the rotor are influenced, the torque of the electric tool using the motor is small, the mechanical transmission is complex, in order to solve the problem of heat generation, an air duct is normally arranged on the existing electric tool, fan blades are additionally arranged at the position of the motor, and air flow near the motor is kept through the fan blades, the motor is cooled, but the liquid such as water and the like outside easily enters the electric tool from the air duct, so that the electric tool has a use fault and the use is influenced.
SUMMERY OF THE UTILITY MODEL
To above circumstances, for overcoming the defect of above prior art, the utility model aims at providing an electric tool that work efficiency is high, and the noise is little, and mechanical transmission is simple and waterproof performance is good.
In order to achieve the above object, the technical solution of the present invention is:
an electric tool is composed of a main casing, a motor in said main casing, a stator, a rotor in said stator, a front magnetic bearing and a back magnetic bearing for supporting said rotor, a front sensor and a back sensor on said front and back magnetic bearings, and an axial locating bearing on the side of said front or back magnetic bearing away from said rotor.
Preferably, the axial positioning bearing is provided on the side of the rear magnetic bearing facing away from the rotor.
Preferably, the front end sensor and the rear end sensor are mounted on a side of the front magnetic bearing and the rear magnetic bearing close to the rotor.
Preferably, the front magnetic bearing is covered with an end cap.
Preferably, the end caps are secured by pins.
Compared with the prior art, the utility model has the advantages of:
the electric tool has the technical scheme that the rotor can be in a suspension state due to the magnetic fields generated by the front magnetic bearing and the rear magnetic bearing of the motor when the electric tool operates, the alternating magnetic field generated by the stator can drive the rotor to rotate at high speed in the suspension state, and the rotor does not have a contact surface with the front magnetic bearing and the rear magnetic bearing and does not generate mechanical friction when rotating, so that the electric tool is enabled to be in a state of suspension
(1) The starting power is greatly reduced, the heat generation is reduced, the energy loss is reduced, the noise is reduced, and the working efficiency of the electric tool can be effectively improved.
(2) The air duct and the fan are not required to be arranged at the position of the motor as the common electric tool, so that the whole electric tool can be made into a totally-enclosed form, the waterproofness of the whole electric tool is greatly improved, and the electric tool is suitable for special industries (such as chemical industry, underwater operation and the like).
(3) The conversion efficiency of motor output is effectively improved, and the mechanical transmission with larger torque is simpler.
(4) The technical scheme has reasonable structural design and convenient use, can realize mass production, and has wide market prospect.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention in a cross-sectional view;
fig. 2 is a schematic view of the structure of the motor of the present invention.
As shown in the figure:
1, a main machine shell; 2, a motor; 201 a stator; 202 a rotor; 203 front magnetic bearing; 204 rear magnetic bearing; 205 front end sensor; 206 a back end sensor; 207 axially positioning the bearing; 208 end caps; 3 pins.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are usually arranged in when used, and are used for the convenience of description only, and do not indicate or imply that the orientations are required to have specific orientations and specific orientations, configurations and operations, and thus, the present invention is not to be construed as being limited.
Example 1:
as shown in fig. 1 and 2, an electric tool includes a main housing 1, a motor 2 is installed in the main housing 1, and the electric tool is characterized in that the motor 2 includes a stator 201 and a rotor 202 disposed in the stator 201, a front magnetic bearing 203 and a rear magnetic bearing 204 for supporting the rotor 202 are respectively disposed at front and rear ends of the rotor 202, when the electric tool is operated, the front magnetic bearing 203 and the rear magnetic bearing 204 generate a magnetic field for separating the rotor 202 from a docking position, thereby suspending the rotor 202, and at the same time, a current flows through the stator 201 to cause the stator 201 to generate an alternating magnetic field, thereby driving the rotor 202 to rotate at a high speed, a front end sensor 205 and a rear end sensor 206 are respectively disposed on the front magnetic bearing 203 and the rear magnetic bearing 204, the front end sensor 205 and the rear end sensor 206 are used for detecting axial and radial positions of the rotor 202, and when the position of the rotor 202 is deviated, the front magnetic bearing 203 and the rear magnetic bearing 204 are respectively adjusted according to signals of the Magnetic field force, so that the rotor 202 returns to a correct position, an axial positioning bearing 207 is arranged on one side of the front magnetic bearing 203 or the rear magnetic bearing 204, which faces away from the rotor 202, and the axial positioning bearing 207 can improve axial stability of the rotor 202 during rotation.
As shown in fig. 2, further, an axial positioning bearing 207 is provided on a side of the rear magnetic bearing 204 facing away from the rotor 202.
As shown in fig. 2, further, a front end sensor 205 and a rear end sensor 206 are mounted on the sides of the front magnetic bearing 203 and the rear magnetic bearing 204 close to the rotor 202.
In this embodiment, when the motor 2 is operated, after the rotor 202 is suspended by the magnetic fields generated by the front magnetic bearing 203 and the rear magnetic bearing 204, the alternating magnetic field generated by the stator 201 drives the rotor 202 to rotate at a high speed, and at this time, no contact surface exists between the rotor 202 and the front magnetic bearing 203 and the rear magnetic bearing 204 during rotation, so that no friction is generated, the heating phenomenon is reduced, the energy loss is reduced, the noise is reduced, and the working efficiency of the electric tool can be effectively improved.
It should be mentioned that, need add the fan blade in motor 2 department and set up the wind channel on main frame casing 1 in general electric tool, this just leads to water to get into electric tool from the wind channel easily and influences waterproof nature, then need not to set up the wind channel and add the fan blade in this design for electric tool can make totally closed form, and waterproof nature promotes greatly, makes applicable in special trade (such as chemical industry, underwater operation etc.).
Meanwhile, the conversion efficiency of the output of the motor 2 is effectively improved, and the mechanical transmission with larger torque is simpler.
Example 2:
as shown in fig. 2, this embodiment is optimized based on the above embodiment 1, and the front magnetic bearing 203 is covered with an end cap 208.
As shown in fig. 2, further, the end cap 208 is fixed by the pin 3.
The foregoing embodiments and description have been provided to illustrate the principles and preferred embodiments of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed.
Claims (5)
1. An electric tool comprises a main machine shell (1), wherein a motor (2) is installed in the main machine shell (1), the motor (2) comprises a stator (201) and a rotor (202) arranged in the stator (201), and the electric tool is characterized in that a front magnetic bearing (203) and a rear magnetic bearing (204) which are used for supporting the rotor (202) are respectively arranged at the front end and the rear end of the rotor (202), a front end sensor (205) and a rear end sensor (206) are respectively arranged on the front magnetic bearing (203) and the rear magnetic bearing (204), and an axial positioning bearing (207) is arranged on one side of the front magnetic bearing (203) or the rear magnetic bearing (204) deviating from the rotor (202).
2. A power tool according to claim 1, characterized in that the axial positioning bearing (207) is provided on a side of the rear magnetic bearing (204) facing away from the rotor (202).
3. A power tool according to claim 1, characterized in that the front end sensor (205) and the rear end sensor (206) are mounted on the side of the front (203) and rear (204) magnetic bearings close to the rotor (202).
4. A power tool according to claim 1, wherein the front magnetic bearing (203) is covered with an end cap (208).
5. A power tool according to claim 4, characterized in that the end cap (208) is fixed by means of a pin (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020754050.XU CN212063755U (en) | 2020-05-09 | 2020-05-09 | Electric tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020754050.XU CN212063755U (en) | 2020-05-09 | 2020-05-09 | Electric tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212063755U true CN212063755U (en) | 2020-12-01 |
Family
ID=73526542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020754050.XU Active CN212063755U (en) | 2020-05-09 | 2020-05-09 | Electric tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212063755U (en) |
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2020
- 2020-05-09 CN CN202020754050.XU patent/CN212063755U/en active Active
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