Rotor magnetic steel embedded high-speed brushless motor

Abstract

The utility model relates to the technical field of brushless motors, and discloses a rotor magnetic steel embedded high-speed brushless motor, and the rotor comprises a rotor iron core, and counterweight holes and magnetic steel grooves which are radially arranged on the rotor iron core along the direction of a motor shaft at equal intervals and are circumferentially and symmetrically distributed on the rotor iron core. According to the invention, the magnetic steel is vertically inserted into the magnetic steel grooves in the radial direction, so that the air gap flux density of the motor is increased, and the torque density and the power density are improved; the balancing weight is vertically inserted into the balancing weight hole in the radial direction, so that the effects of shortening the time for dynamic balancing and improving the high-speed operation safety of the motor under cold and hot impact are achieved. And finally, the production procedures of the motor are reduced, the production efficiency of the motor is improved, the production cost of the motor is reduced, and the safety of the motor is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of brushless motors, and in particular to a high-speed brushless motor with an embedded rotor magnet. Background Art

[0002] Most of the existing wall breaking machines use series motors, which have limited speed, low efficiency, high noise, short life, and electric sparks. Brushless motors can basically solve these problems.

[0003] In order to reduce noise and vibration during operation and extend service life, existing high-speed brushless motors will add dynamic balancing rings or rotor dynamic balancing mud to the motor rotor during motor production to reduce rotor imbalance, but there are the following disadvantages:

[0004] 1. The use of dynamic balancing rings will increase the number of motor production processes, reduce production efficiency, and ultimately increase the production cost of the motor;

[0005] 2. When using dynamic balancing mud, you need to reserve enough time for the mud to dry thoroughly. In addition, when the motor runs at high speed, the motor will also heat up. The high-speed rotation of the motor and the shock of hot and cold will cause the dynamic balancing mud to fall off, which will eventually cause problems with the product. Utility Model Content

[0006] The purpose of the present application is to provide a high-speed brushless motor with an embedded rotor magnet to solve the technical problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned purpose, the present application discloses the following technical solutions: a rotor magnetic steel embedded high-speed brushless motor, comprising a front cover, a rear cover, a rotor and a stator, wherein the front cover and the rear cover are connected to form a cavity, the rotor and the stator are arranged in the cavity after being assembled, and a motor shaft is arranged on the rotor; the rotor comprises: a counterweight hole, a rotor core and a magnetic steel slot; the counterweight hole and the magnetic steel slot are arranged on the rotor core along the radial direction of the motor shaft, the counterweight block is radially vertically inserted in the counterweight hole, and the magnetic steel is radially vertically inserted in the magnetic steel slot;

[0008] The plurality of counterweight holes are equidistantly arranged on the rotor core, and the plurality of counterweight holes are symmetrically arranged based on the circumference of the motor shaft. The plurality of magnetic steel slots are equidistantly arranged on the rotor core, and the plurality of magnetic steel slots are symmetrically arranged based on the circumference of the motor shaft.

[0009] Preferably, a counterweight hole is provided between two adjacent magnetic steel slots.

[0010] Preferably, the counterweight hole is an elongated slot hole.

[0011] Preferably, the counterweight hole and the counterweight block are interference fit.

[0012] Beneficial effects: The rotor magnet embedded high-speed brushless motor of the present application achieves the effect of increasing the air gap magnetic density of the motor, improving the torque density and improving the power density (reducing the motor volume under the same power and reserving space for the counterweight hole) by inserting the magnetic steel radially and vertically into the magnetic steel slot; by inserting the counterweight block radially and vertically into the counterweight hole, the effect of shortening the time used for dynamic balancing and improving the safety of high-speed operation of the motor under cold and hot shock is achieved. Finally, the present application reduces the production process of the motor, improves the production efficiency of the motor, reduces the production cost of the motor, and ensures the safety of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 An exploded diagram of a high-speed brushless motor with embedded rotor magnets provided in an embodiment of the present application;

[0015] Figure 2 An exploded diagram of a high-speed brushless motor rotor with embedded rotor magnets provided in an embodiment of the present application;

[0016] In the figure: 1. counterweight hole; 2. rotor core; 3. magnetic steel slot; 4. front cover; 5. rear cover; 6. stator. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0018] In this article, the term "comprising" is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "comprising..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0019] The present embodiment discloses a high-speed brushless motor with embedded rotor magnet, comprising a front cover 4, a rear cover 5, a rotor and a stator 6. The front cover 4 and the rear cover 5 are connected to form a cavity. It is feasible to connect the front cover 4 and the rear cover 5 with bolts. To protect the power line, it is feasible to install a wire protection sleeve at the connection between the front cover 4 and the rear cover 5. The rotor and the stator 6 are arranged in the cavity after assembly, and a motor shaft is arranged on the rotor; the rotor comprises: a counterweight hole 1, a rotor core 2 and a magnetic steel slot 3; the counterweight hole 1 and the magnetic steel slot 3 are arranged on the rotor core 2 along the radial direction of the motor shaft, the counterweight block is radially inserted vertically in the counterweight hole 1, and the magnetic steel is radially inserted vertically in the magnetic steel slot 3 Inside; multiple counterweight holes 1 are equidistantly arranged on the rotor core 2, and the multiple counterweight holes 1 are symmetrically arranged based on the circumference of the motor shaft, and multiple magnetic steel slots 3 are equidistantly arranged on the rotor core 2, and the multiple magnetic steel slots 3 are symmetrically arranged based on the circumference of the motor shaft; wherein, the front end cover 4, the rear end cover 5, the stator 6 and the motor shaft can be any one of the existing technologies, and the connection method of the front end cover 4, the rear end cover 5, the stator 6 and the motor shaft can be any one of the existing technologies; in order to stabilize the rotation of the rotor, it is feasible to install a front end bearing at the front end of the motor shaft, install a rear end bearing at the rear end of the motor shaft, and install a crest gasket for adjusting the bearing preload at the front end of the front end bearing.

[0020] In this embodiment, a counterweight hole 1 is provided between two adjacent magnetic steel slots 3, and the counterweight hole 1 is a long strip slot; the counterweight hole 1 is interference fit with the counterweight block, and the size of the counterweight hole 1 is slightly smaller than the diameter of the counterweight block.

[0021] In this embodiment, the installation process of the rotor magnet embedded high-speed brushless motor includes:

[0022] S1: Press the rotor into the stator and connect it. The connection method is any one of the prior art.

[0023] S2: Install the front cover at the front end of the assembled stator and rotor, install the rear cover at the rear end of the assembled stator and rotor, and fix the front cover and the rear cover. The fixing method is any one of the prior art.

[0024] The rotor installation process includes:

[0025] D1: After the magnetic steel is coated with glue, it is radially inserted vertically into the magnetic steel slot 3 and waits for the glue to dry completely; the glue can be any one of the existing technologies;

[0026] D2: Dynamic balancing of rotor components, including:

[0027] D21: Measure the unbalance of the original rotor parts and the position that needs to be weighted;

[0028] D22: Cut the counterweight block and vertically insert it into the counterweight hole 1 in radial direction; in this embodiment, copper wire with high specific gravity and small volume is selected as the counterweight block, and correspondingly, the counterweight hole 1 is the corresponding copper wire hole; that is, in the dynamic balancing of the rotor component, copper wire is used for counterweight;

[0029] D23: Test the dynamic balance of the rotor component again to check whether the dynamic balance of the rotor component meets the requirements. If yes, proceed to D3, otherwise proceed to D22-D23, wherein when repeating D22, the counterweight block can be radially inserted vertically into other reserved counterweight holes 1; the dynamic balance requirements in this embodiment are technical indicators well known to technicians in the relevant technical field, and are not described in detail here;

[0030] D3: Use high temperature resistant glue to bond the place where the counterweight is placed to the iron core to further fix the counterweight; the high temperature resistant glue can be any one of the existing technologies.

[0031] In summary, the rotor magnet embedded high-speed brushless motor of this embodiment achieves the effect of increasing the air gap magnetic density of the motor, improving the torque density and improving the power density (reducing the motor volume under the same power and reserving space for the counterweight hole) by inserting the magnetic steel radially and vertically into the magnetic steel slot; by inserting the counterweight block radially and vertically into the counterweight hole, the effect of shortening the time used for dynamic balancing and improving the safety of high-speed operation of the motor under cold and hot shock is achieved. Finally, this embodiment reduces the production process of the motor, improves the production efficiency of the motor, reduces the production cost of the motor, and ensures the safety of the motor.

[0032] Finally, it should be noted that the above is only a preferred embodiment of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A high-speed brushless motor with an embedded rotor magnet, comprising a front cover (4), a rear cover (5), a rotor and a stator (6), wherein the front cover (4) and the rear cover (5) are connected to form a cavity, the rotor and the stator (6) are arranged in the cavity after being assembled, and a motor shaft is arranged on the rotor; characterized in that: The rotor comprises: a counterweight hole (1), a rotor core (2) and a magnetic steel slot (3); the counterweight hole (1) and the magnetic steel slot (3) are arranged on the rotor core (2) along the radial direction of the motor shaft, the counterweight block is radially and vertically inserted in the counterweight hole (1), and the magnetic steel is radially and vertically inserted in the magnetic steel slot (3); a plurality of the counterweight holes (1) are arranged on the rotor core (2) at equal intervals, and the plurality of the counterweight holes (1) are symmetrically arranged based on the circumference of the motor shaft; a plurality of the magnetic steel slots (3) are arranged on the rotor core (2) at equal intervals, and the plurality of the magnetic steel slots (3) are symmetrically arranged based on the circumference of the motor shaft.

2. The high-speed brushless motor with embedded rotor magnet according to claim 1, characterized in that: A counterweight hole (1) is provided between two adjacent magnetic steel slots (3).

3. The high-speed brushless motor with embedded rotor magnet according to claim 1, characterized in that: The counterweight hole (1) is a long strip-shaped slot hole.

4. The high-speed brushless motor with embedded rotor magnet according to claim 1, characterized in that: The counterweight hole (1) is interference fit with the counterweight block.

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