Smooth brushless actuator

Abstract

The application discloses a stable brushless actuator, which comprises a rear shell, a front shell, a stator assembly and a rotor assembly. A balance rotating joint is arranged on the rotating shaft end of the rotor assembly and in the internal cavity of the rear shell. A magnet is arranged on the other end of the rotating shaft. A functional circuit board is arranged on the stator assembly and close to the magnet. A lower bearing is arranged on the rotating shaft and close to the magnet. The balance rotating joint is in a "Z" shape structure. An upper bearing is arranged on the head of the balance rotating joint. The application adopts electronic commutation and is in a brushless mode. The application has the characteristics of lower noise, lower electromagnetic interference, more accurate control, simpler installation, more convenient maintenance and the like. The balance rotating joint arranged on the rotating shaft end strengthens the balance degree and stability of the rotating shaft. Therefore, the application has a longer service life and higher working efficiency.

Description

Technical Field

[0001] This invention relates to a power drive device, specifically to an actuator. Background Technology

[0002] Power drive devices (actuators) can be divided into linear actuators, rotary actuators, etc. A linear actuator is an actuator that outputs linear motion, while a rotary actuator outputs rotary motion. An actuator (motor) consists of a rotor assembly and a stator assembly, etc. The rotor assembly is a rotating component used to convert electrical energy into mechanical energy and vice versa. Currently, actuators generally include a rear housing, a front housing (and a plug away from the front housing), a stator assembly (including magnets and stator housing), and a rotor assembly (including a shaft, rotor windings, commutator, carbon brushes, bearings, etc.). A brushed actuator is characterized by the frictional engagement between the commutator and carbon brushes (current is conducted to the rotor windings through the carbon brushes and commutator, generating a rotating magnetic field). Brushed actuators suffer from energy loss due to friction between the carbon brushes and commutator. This friction easily generates sparks and mechanical vibrations, resulting in noise and electromagnetic interference. Wear-out carbon brushes require maintenance and replacement, and the speed control accuracy is limited. The rotor assembly's shaft is equipped with upper, middle, and lower bearings (depending on their positions), and its rotational balance and stability need improvement. Furthermore, its manufacturing process is cumbersome, its structure complex, and its operation unstable with low efficiency. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a smooth brushless actuator that is easy to install, maintain, and operate stably.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a smooth brushless actuator, comprising a rear housing, a front housing, a stator assembly, and a rotor assembly, wherein a balance adapter is installed on the end of the rotor assembly's shaft and in the cavity inside the rear housing, a magnet is installed on the other end of the rotor assembly's shaft, a functional circuit board is installed on the stator assembly near the magnet, and a lower bearing is installed on the shaft near the magnet.

[0005] The balance adapter has a "Z" shaped structure, and an upper bearing is mounted on the head of the balance adapter. A plug is connected to the outer surface of the stator assembly, and the front housing, stator assembly and plug are injection molded as one piece.

[0006] A central bearing is installed on the rotating shaft and inside the rear housing. A metal cover is provided around the central bearing and the balance adapter, and the metal cover and the rear housing are an integral structure.

[0007] By employing this invention, the functional circuit board and magnetic induction structure utilize electronic commutation, resulting in a brushless operation. There is no physical contact between the carbon brushes and the commutator, eliminating mechanical wear, sparks from carbon brush friction, and mechanical vibration. This leads to lower noise, lower electromagnetic interference, more precise control, simpler installation, and easier maintenance. The balance adapter at the shaft end, along with the upper, middle, and lower bearings, enhances the balance and stability of the shaft rotation. This results in a longer service life and higher operating efficiency. The front housing, stator assembly, and plug are injection molded as a single unit; the metal cover and rear housing are also integrated, simplifying the manufacturing process, facilitating installation, optimizing assembly procedures, improving production efficiency, and ensuring actuator quality. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of the smooth brushless actuator of the present invention. Detailed Implementation

[0009] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0010] Reference Figure 1 As can be seen, the present invention's smooth brushless actuator includes a rear housing 21, a front housing 23, a stator assembly 22, and a rotor assembly 34 (including a shaft, rotor windings, etc.). A balance adapter 32 (serving as a balancer and adapter) is installed on the end of the shaft 39 of the rotor assembly 34 and in the cavity inside the rear housing 21. A magnet 37 is installed on the other end of the shaft 39 of the rotor assembly 34. A functional circuit board 36 (i.e., a PCBA board, which corresponds to the magnet but is spaced a certain distance apart to generate induction) is installed on the stator assembly 22 near the magnet. A lower bearing 35 is installed on the shaft 39 near the magnet (within the stator assembly 22). The present invention uses electronic commutation to achieve brushless operation through the induction structure of the functional circuit board 36 and the magnet 37, achieving more precise control. The magnetic induction between the stator assembly 22 and the rotor assembly 34 causes the shaft 39 to rotate, realizing the conversion of electrical energy into mechanical energy.

[0011] The balance adapter 32 has a "Z"-shaped structure, and an upper bearing 11 is mounted on the head of the balance adapter 32 to enhance the balance and stability of the rotating shaft. A plug 24 (including pins) is connected to the outer surface of the stator assembly 22, and the front housing 23, stator assembly 22, and plug 24 are injection molded as a single unit, reducing the cumbersome wiring harness interface assembly process of the plug, optimizing the assembly process, and improving production efficiency. A middle bearing 33 is mounted on the rotating shaft 39 and inside the rear housing 21. A metal cover 17 is provided around the middle bearing 33 and the balance adapter 32, and this metal cover 17 is an integral structure with the rear housing 21, providing protection, simplifying the assembly process, reducing the production cost of parts, reducing assembly errors, and improving assembly accuracy.

Claims

1. A smooth brushless actuator comprising a rear housing, a front housing, a stator assembly, a rotor assembly, characterized in that: A balance adapter is installed on the end of the rotor assembly shaft and in the cavity inside the rear housing. A magnet is installed on the other end of the rotor assembly shaft. A functional circuit board is installed on the stator assembly near the magnet. A lower bearing is installed on the shaft near the magnet.

2. The smooth-brush actuator of claim 1, wherein: The balance adapter has a "Z" shaped structure, and an upper bearing is mounted on the head of the balance adapter.

3. A smooth-brush actuator as claimed in claim 1 or 2, characterized in that: The outer surface of the stator assembly is connected to a plug, and the front housing, stator assembly and plug are injection molded as one piece.

4. A smooth-brush actuator as claimed in claim 1 or 2, characterized in that: A central bearing is installed on the rotating shaft and inside the rear housing. A metal cover is provided around the central bearing and the balance adapter, and the metal cover and the rear housing are an integral structure.

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