Electric device and electric push rod

Abstract

The utility model relates to the technical field of electric driving parts, in particular to an electric device and an electric push rod, and the electric push rod comprises a shell, a speed reduction module, an output shaft and the electric device, the electric device comprises a rotating shaft, a rotor, a stator and a detection module, the detection module controls the flow of current of a plurality of stator coils according to the position of a magnetic pole on the rotor, so that the coils generate a magnetic field with attractive force or repulsive force to a specific magnetic pole on the rotor, and the rotor is pushed to rotate; the end, away from the rotor, of the rotating shaft is connected with the input end of the speed reduction module, and the output end of the speed reduction module is connected with the output shaft. According to the electric device and the electric push rod, the high utilization rate of the coil is achieved through the self-control brushless motor, the torque pulsation is small, and the control precision performance of the electric push rod is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric drive components, in particular to an electric device and an electric push rod. Background Art

[0002] An electric motor is a device that converts electrical energy into mechanical energy, while an electric linear actuator is an electric drive device that converts the rotational motion of a motor into linear reciprocating motion of a linear actuator.

[0003] Generally speaking, the stator coils of the brushless motors commonly used in electric linear actuators are mostly made into a three-phase symmetrical star connection. This connection has large torque pulsation and low coil utilization, resulting in low linear reciprocating motion accuracy of the electric linear actuator, affecting the control accuracy performance of the electric linear actuator. Summary of the invention

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the utility model is to provide an electric device and an electric push rod, which achieve high utilization of the coil and small torque pulsation through an automatic brushless motor, thereby effectively improving the control accuracy performance of the electric push rod.

[0005] The utility model is realized through the following technical solutions:

[0006] An electric device, comprising:

[0007] A rotating shaft for outputting power; a rotor, which is coaxially connected to the rotating shaft; a stator, which includes a plurality of coils and the plurality of coils are respectively adjacent to the rotor, so that when an alternating current flows through the plurality of coils; and a detection module, which controls the flow of current in the plurality of coils according to the position of the magnetic poles on the rotor, so that the coils generate a magnetic field that has an attractive or repulsive force on a specific magnetic pole on the rotor, thereby driving the rotor to rotate.

[0008] Wherein, the detection module includes a circuit board and a sensor, and the sensor is electrically connected between the circuit board and the rotor.

[0009] Wherein, the rotor comprises a main body and a plurality of permanent magnets mounted on the main body, and the number of the permanent magnets corresponds to the number of coils; and the sensor is an electromagnetic sensor.

[0010] Wherein, one end of the rotating shaft close to the rotor protrudes out of the rotor and is provided with an impeller for coaxial rotation.

[0011] In addition, the utility model also discloses an electric push rod, which includes a shell, a reduction module installed in the shell, an output shaft and the electric device as described above; the end of the rotating shaft away from the rotor is connected to the input end of the reduction module, and the output end of the reduction module is connected to the output shaft.

[0012] Wherein, the reduction module includes a worm wheel and a worm, the worm is coaxially rotatably arranged at one end of the rotating shaft away from the rotor, the worm wheel is coaxially rotatably arranged on the output shaft, and the worm wheel is meshed with the worm.

[0013] Beneficial effects of the utility model:

[0014] The utility model provides an electric device and an electric push rod. The detection module on the circuit board controls the switch of the circuit board by detecting the position of the magnetic pole on the rotor, so as to control the on-off of the corresponding coil, so that the coil generates a magnetic field with an attractive or repulsive force on a specific magnetic pole, and drives the rotor to rotate continuously, so as to achieve the purpose of driving the rotating shaft to rotate continuously and do work.

[0015] Compared with the prior art, the utility model uses multiple groups of coils, and obtains an induced electromotive force close to a sinusoidal waveform by inputting a pulse voltage of space vector pulse width modulation, and generates a continuous circular magnetic field in the air gap. This self-controlled brushless motor has a higher coil utilization rate and smaller torque pulsation than ordinary brushless motors, which makes the electric linear actuator have high control accuracy and can cope with high-precision control scenarios that ordinary electric linear actuators cannot cope with. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the utility model. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0018] Figure 2 It is an exploded view of the utility model.

[0019] Reference numerals

[0020] Housing--100, shaft--101, impeller--102, rotor--103, main body--104, permanent magnet--105, stator--106, output shaft--107,

[0021] Detection module--200, circuit board--201, sensor--202,

[0022] Worm wheel--301, worm--302. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] An electric motor is a device that converts electrical energy into mechanical energy, while an electric linear actuator is an electric drive device that converts the rotational motion of a motor into linear reciprocating motion of a linear actuator.

[0027] Generally speaking, the stator coils of the brushless motors commonly used in electric linear actuators are mostly made into a three-phase symmetrical star connection. This connection has large torque pulsation and low coil utilization, resulting in low linear reciprocating motion accuracy of the electric linear actuator, affecting the control accuracy performance of the electric linear actuator.

[0028] In order to solve the above problems, this embodiment discloses an electric push rod, the structure of which is as follows: Figure 1 to Figure 2As shown, the electric push rod includes a housing 100, a reduction module installed in the housing 100, an output shaft 107 and an electric device; the electric device includes: a rotating shaft 101 for outputting power; a rotor 103, the rotor 103 is coaxially connected to the rotating shaft 101; a stator 106, the stator 106 includes a plurality of coils 108 and the plurality of coils 108 are respectively adjacent to the rotor 103, so that when an alternating current flows through the plurality of coils 108; and a detection module 200, the detection module 200 controls the flow of current of the plurality of coils 108 according to the position of the magnetic poles on the rotor 103, so that the coils 108 generate a magnetic field of attraction or repulsion to a specific magnetic pole on the rotor 103, thereby driving the rotor 103 to rotate; the end of the rotating shaft 101 away from the rotor 103 is connected to the input end of the reduction module, and the output end of the reduction module is connected to the output shaft 107.

[0029] In this embodiment, the rotor 103 includes a main body 104 and a plurality of permanent magnets 105 mounted on the main body 104, the number of the permanent magnets 105 corresponds to the number of the coils 108, so as to improve the accuracy of the control of the electric push rod; the reduction module of this embodiment includes a worm wheel 302 and a worm 301, the worm 301 is coaxially rotatably arranged at one end of the rotating shaft 101 away from the rotor 103, the worm wheel 302 is coaxially rotatably arranged on the output shaft 107, the worm wheel 302 is meshed with the worm 301, and the output of the rotating shaft 101 is reduced and amplified by the worm 301 and the worm wheel 302, thereby effectively improving the output stability of the electric push rod.

[0030] Specifically, in an electric device and an electric push rod of the present embodiment, the detection module 200 on the circuit board 201 controls the switch of the circuit board 201 by detecting the position of the magnetic poles on the rotor 103, so as to control the on and off of the corresponding coil 108, so that the coil 108 generates a magnetic field with an attractive or repulsive force on a specific magnetic pole, thereby driving the rotor 103 to rotate continuously, thereby achieving the purpose of driving the rotating shaft 101 to rotate continuously to do work.

[0031] Compared with the prior art, the utility model uses multiple groups of coils 108, and obtains an induced electromotive force close to a sinusoidal waveform by inputting a pulse voltage of space vector pulse width modulation, and generates a continuous circular magnetic field in the air gap. This self-controlled brushless motor has a higher utilization rate of the coils 108 and smaller torque pulsation than ordinary brushless motors, which makes the electric linear actuator have high control accuracy and can cope with high-precision control scenarios that ordinary electric linear actuators cannot cope with.

[0032] Furthermore, the detection module 200 includes a circuit board 201 and a sensor 202 . The sensor 202 is electrically connected between the circuit board 201 and the rotor 103 . Preferably, the sensor 202 is an electromagnetic sensor 202 .

[0033] In addition, an impeller 102 is protruding from the rotor 103 and coaxially rotated at one end of the rotating shaft 101 close to the rotor 103. When the rotating shaft 101 rotates, it drives the impeller 102 to rotate. The impeller 102 can dissipate heat for the rotor 103, the circuit board 201 and other components inside the housing 100 (the housing 100 is provided with corresponding vents to form convection), thereby increasing the service life of the electric linear actuator.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. An electric device, characterized in that: include: A rotating shaft for outputting power; A rotor, the rotor being coaxially rotatably connected with the rotating shaft; A stator, the stator comprising a plurality of coils, wherein the plurality of coils are respectively adjacent to the rotor, so that when an alternating current flows through the plurality of coils; and a detection module, which controls the flow of current in the plurality of coils according to the positions of the magnetic poles on the rotor, so that the coils generate a magnetic field with an attractive or repulsive force on specific magnetic poles on the rotor, thereby driving the rotor to rotate.

2. An electric device according to claim 1, characterized in that: The detection module includes a circuit board and a sensor, and the sensor is electrically connected between the circuit board and the rotor.

3. An electric device according to claim 2, characterized in that: The rotor comprises a main body and a plurality of permanent magnets mounted on the main body, wherein the number of the permanent magnets corresponds to the number of the coils; The sensor is an electromagnetic sensor.

4. An electric device according to claim 1, characterized in that: One end of the rotating shaft close to the rotor protrudes out of the rotor and is provided with an impeller for coaxial rotation.

5. An electric push rod, characterized in that: It comprises a housing, a reduction module installed in the housing, an output shaft and an electric device as claimed in any one of claims 1 to 4; One end of the rotating shaft away from the rotor is connected to the input end of the reduction module, and the output end of the reduction module is connected to the output shaft.

6. The electric push rod according to claim 5, characterized in that: The reduction module comprises a worm wheel and a worm, wherein the worm is coaxially rotatably arranged at one end of the rotating shaft away from the rotor, the worm wheel is coaxially rotatably arranged at the output shaft, and the worm wheel is meshed with the worm.

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