CN111769710A - A brushless motor - Google Patents

Abstract

The present invention relates to a brushless motor, comprising: the stator is sleeved outside the rotor, the coil is wound on the stator, the stator is a soft magnet, and the rotor is a strong magnetic permanent magnet. The brushless motor provided by the invention overcomes the periodic torque fluctuation of the traditional brushless motor in the rotating process, does not need extra current for balancing, can be driven by constant current and sine wave current, simplifies the driving requirements of the brushless motor and widens the application field of the brushless motor.

Description

A brushless motor

technical field

The present invention relates to the technical field of brushless motors, in particular to a brushless motor.

Background technique

During the working process of the existing brushless motors on the market, the rotor magnetic pole and the stator magnetic pole are in the process of approaching and separating, and the acceleration torque and deceleration torque are periodically generated, which greatly prevents the servo drive control of the motor. Using a brushless motor controlled by three-phase sinusoidal alternating current can solve this problem, but the technology is complicated and the cost is high.

SUMMARY OF THE INVENTION

The present invention provides a brushless motor, which solves the problem of periodically generating acceleration torque and deceleration torque during the approach and separation of rotor magnetic poles and stator magnetic poles.

In order to achieve the above object, the present invention provides the following technical solutions:

A brushless motor, comprising: a stator 1, a rotor 2 and at least a pair of coils 3, the stator 1 is sleeved outside the rotor 2, the coils 3 are wound on the stator 1, and the stator 1 is Soft magnets, the rotor 2 is a strong magnetic permanent magnet.

Preferably, the rotor 2 is arranged above the stator 1 , or the rotor 2 is arranged below the stator 1 .

Preferably, it also includes a rotating shaft 4 and a bearing 5 , the rotor 2 is sleeved on the rotating shaft 4 , and the bearing 5 is sleeved on the rotating shaft 4 .

Preferably, the stator 1 is a transformer magnetic ring, and the transformer magnetic ring is made of PC40 material.

Preferably, the single pair of the coils 3 includes a first part and a second part, and the first part is connected to one end of the second part.

Preferably, the first part is wound on the stator 1 , and the second part is wound on the stator 1 by rotating the first part by 180° with the center of the stator 1 as the origin.

By implementing the above technical solutions, the following technical effects are achieved: the brushless motor provided by the present invention overcomes the periodic torque fluctuation of the traditional brushless motor during the rotation process, does not require additional current to balance, can be driven by constant current, and also It can be driven by a sine wave current, which simplifies the driving requirements of the brushless motor and broadens the application field of the brushless motor.

Description of drawings

FIG. 1 is a schematic structural diagram (a perspective view) of a brushless motor provided by the present invention.

Detailed ways

In order to better understand the technical solutions of the present invention, the embodiments provided by the present invention are described in detail below with reference to the accompanying drawings.

A brushless motor, comprising: a stator 1, a rotor 2 and at least a pair of coils 3, the stator 1 is sleeved outside the rotor 2, the coils 3 are wound on the stator 1, and the stator 1 is Soft magnets, the rotor 2 is a strong magnetic permanent magnet.

In this embodiment, the stator 1 is sleeved outside the rotor 2, the coil 3 is wound on the stator 1, and a soft magnetic body is used as the stator 1. The soft magnetic body can be an iron-silicon alloy, iron Aluminum alloy, FeSiAl alloy, preferably, the soft magnet is a transformer magnetic ring, the transformer magnetic ring is made of PC40 material (ferrite power material), and a strong magnetic permanent magnet is used as the rotor 2, and the rotor 2 is a 2-pole radially magnetized rubidium-iron-boron strong magnet. This unique structure makes the rotor 2 hardly experience the acceleration or deceleration force between the rotor 2 and the stator 1 during rotation when there is no current. , there is no interference of the acceleration or deceleration force, so that the brushless motor of this structure does not need to use a complex sine wave current drive, and only a simple constant current drive can be applied to a servo motor. At the same time, a simple constant current drive, which greatly reduces the number of current sampling times in the coil 3 for each phase of the brushless motor during operation, which enables this drive to have a higher drive speed than the existing motor on the premise of the same sampling frequency. , the number of the coils 3 can be 2, 4, 6, etc., the coils 3 are used to wrap the stator 1, so that the stator 1 forms a space magnetic field that can drive the rotor 2 to rotate, while using The coil 3 greatly reduces the inductance of the brushless motor winding, so that the coil 3 can operate at a higher frequency, because the magnetic field generated by the coil 3 is distributed in a relatively large space, so we Not only can the rotor 2 be placed inside the stator 1, but also the rotor 2 can be placed above the stator 1 or below the stator 1, which is more convenient to use.

On the basis of the above embodiment, in other embodiments, more specifically, it further includes a rotating shaft 4 and a bearing 5 , the rotor 2 is sleeved on the rotating shaft 4 , and the bearing 5 is sleeved on the rotating shaft 4 superior.

In this embodiment, the rotor 2 is sleeved on the rotating shaft 4, and under the action of the stator 1 and the coil 3, the rotor 2 can rotate around the rotating shaft 4, and the bearing 5 is sleeved It is arranged on the rotating shaft 4, and is connected with the device that needs to be driven by the power using the bearing 5.

On the basis of the above embodiments, in other embodiments, more specifically, the single pair of the coils 3 includes a first part and a second part, the first part is connected to one end of the second part, and the The first part is wound on the stator 1 , and the second part is wound on the stator 1 by rotating the first part by 180° with the center of the stator 1 as the origin.

In this embodiment, each pair of the coils 3 includes a first part and a second part, and the second part is to rotate the first part by 180° with the center of the stator 1 as the origin, and then wind it around the stator 1 The number of turns of the first part and the second part are equal, the thick lines are the same, the direction is opposite, and the position is symmetrical in the center. After the power is turned on, the first part and the second part are generated on the stator 1 The magnitude of the magnetomotive force is equal, so the magnetic moment along the direction of the stator 1 is neutralized, leaving only the magnetic field outside the stator 1. Although the strength of the magnetic field is weakened, the direction is exactly to drive the rotor 2 to rotate. The magnetic field generates a magnetic field that can make the rotor rotate, so that the rotor 2 does not have the force of sudden acceleration and deceleration of the rotor 2 during the rotation of the ordinary brushless motor.

The brushless motor provided by the embodiment of the present invention has been introduced in detail above. For those skilled in the art, according to the idea of the embodiment of the present invention, there will be changes in the specific implementation and application scope. As mentioned above, the contents of this specification should not be construed as limiting the present invention.

Claims (6)

1. A brushless motor, characterized in that it comprises: a stator (1), a rotor (2) and at least one pair of coils (3), wherein the stator (1) is sleeved outside the rotor (2), so that the The coil (3) is wound on the stator (1), the stator (1) is a soft magnet, and the rotor (2) is a ferromagnetic permanent magnet. 2 . The brushless motor according to claim 1 , wherein the rotor ( 2 ) is arranged above the stator ( 1 ), or the rotor ( 2 ) is arranged below the stator ( 1 ). 3 . 3. The brushless motor according to claim 1, characterized in that it further comprises a rotating shaft (4) and a bearing (5), the rotor (2) is sleeved on the rotating shaft (4), and the bearing ( 5) is sleeved on the rotating shaft (4). 4 . The brushless motor according to claim 1 , wherein the stator ( 1 ) is a transformer magnetic ring, and the transformer magnetic ring is made of PC40 material. 5 . 5. The brushless motor according to claim 1, wherein the single pair of the coils (3) comprises a first part and a second part, and the first part is connected to one end of the second part. 6 . The brushless motor according to claim 5 , wherein the first part is wound on the stator ( 1 ), and the second part connects the first part with the center of the stator ( 1 ) as the origin. 7 . Rotate 180° and wrap around the stator (1).

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