Direct-current brushless motor

Abstract

The utility model discloses a direct-current brushless motor, which comprises a motor casing, a stator arranged in the motor casing, a rotor arranged outside the stator, a motor shaft connected with the rotor, the motor casing consists of a front end cover and a rear end cover, the stator and the rotor are positioned in the front end cover, and a control circuit board is arranged in the rear end cover. A circuit board support is arranged between the front end cover and the rear end cover, and the control circuit board is fixed on the circuit board support. According to the direct current brushless motor, the control circuit board is installed in the motor shell through the circuit board support, the overall space occupation of equipment can be reduced, electromagnetic interference generated by motor operation is reduced, the working stability of the motor can be improved, and the service life of the motor can be prolonged.

Description

Technical Field

[0001] The utility model relates to a motor, in particular to a brushless DC motor. Background Art

[0002] Due to its advantages such as high efficiency, high reliability and long service life, brushless DC motors have been widely used in the fields of household appliances, industrial equipment, automotive electronics, etc. Traditional brushless DC motors usually include components such as a stator, a rotor and a position sensor, and its control circuit is responsible for regulating the speed and torque of the motor to meet different working requirements.

[0003] In traditional designs, the control circuit of the motor is installed outside the motor and connected to the motor through wires. Although this layout can simplify the manufacturing and maintenance of the motor, there are also some problems:

[0004] (1) Space Occupancy: The external control circuit requires additional space, which will increase the overall size and weight for space-constrained application scenarios such as portable devices or precision instruments;

[0005] (2) Electromagnetic Interference: The wiring of the external circuit may increase electromagnetic interference (EMI), affecting the performance of the motor and other electronic devices;

[0006] (3) Reliability: The connection points and wires of the external circuit may cause poor contact or damage due to factors such as vibration and temperature changes, affecting the stability and service life of the motor. Summary of the Invention

[0007] The technical problem to be solved by the utility model is to provide a brushless DC motor that can integrate the control circuit into the motor to reduce space occupancy, reduce electromagnetic interference, and improve the working stability and service life of the motor.

[0008] To solve the above technical problem, a brushless DC motor of the utility model includes a motor housing. A stator is installed inside the motor housing, a rotor is arranged outside the stator, and the rotor is connected to a motor shaft. The motor housing is composed of a front end cover and a rear end cover. The stator and the rotor are located inside the front end cover, a control circuit board is arranged inside the rear end cover, and a circuit board support is arranged between the front end cover and the rear end cover. The control circuit board is fixed on the circuit board support.

[0009] A plurality of external convex blocks for connecting the front end cover and the rear end cover are arranged on the outer side of the circuit board support. The convex block has a connection hole, and a tube slot connecting both ends of the circuit board support is arranged inside the circuit board support. The design of the external convex block and the connection hole can provide a more stable connection method, making the connection between the front end cover and the rear end cover and the circuit board support more firm, reducing structural looseness caused by vibration or impact, and the tube slot connecting both ends of the circuit board support can allow wires to pass through, providing effective protection for the wires.

[0010] A number of inner bumps for fixing the control circuit board are provided inside the circuit board bracket. The inner bumps can provide precise positioning for the control circuit board, ensuring the correct relative position relationship between the circuit board and other motor components, thereby guaranteeing the assembly accuracy and operating performance of the motor. The circuit board bracket is made of plastic or aluminum material and can be integrally formed to reduce production costs.

[0011] A commutator connected to the motor shaft is installed on the rear end cover, which can deflect the output power of the motor to meet different working requirements.

[0012] Support rods are installed at the lower part of the motor housing, which can facilitate the installation and use of the motor.

[0013] The beneficial effects of the present utility model are as follows: In this DC brushless motor, a circuit board bracket is used to install the control circuit board inside the motor housing, which can reduce the overall space occupied by the device, reduce the electromagnetic interference generated during motor operation, and is beneficial to improving the working stability and lifespan of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present utility model will be further described in detail below in conjunction with the drawings and specific embodiments.

[0015] Figure 1 is a schematic structural diagram of the present utility model;

[0016] Figure 2 is a schematic cross-sectional structural diagram of the present utility model;

[0017] Figure 3 is a schematic structural diagram of the circuit board bracket. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Referring to Figures 1 to 3 , a DC brushless motor of the present utility model includes a motor housing 1, a stator 2 is installed inside the motor housing 1, a rotor 3 is arranged outside the stator 2, the rotor 3 is connected to a motor shaft 4, the motor housing 1 is composed of a front end cover 11 and a rear end cover 12, the stator 2 and the rotor 3 are located inside the front end cover 11, a control circuit board 5 is arranged inside the rear end cover 12, and a circuit board bracket 6 is arranged between the front end cover 11 and the rear end cover 12, and the control circuit board 5 is fixed on the circuit board bracket 6.

[0019] In this embodiment, a number of outer bumps 61 for connecting the front end cover 11 and the rear end cover 12 are provided on the outer side of the circuit board bracket 6, a connection hole 62 is provided on the outer bump 61, and a pipe groove 63 connecting both ends of the circuit board bracket 6 is arranged inside the circuit board bracket 6.

[0020] A plurality of inner bumps 64 for fixing the control circuit board 5 are arranged inside the circuit board bracket 6. A commutator 7 connected to the motor shaft 4 is installed on the rear end cover 12. A support rod 8 is installed at the lower part of the motor housing 1.

[0021] The above is only the preferred implementation mode of the present utility model. As long as the technical solutions that achieve the purpose of the present utility model by basically the same means fall within the protection scope of the present utility model.

Claims

1. A brushless DC motor, comprising a motor housing, a stator installed in the motor housing, a rotor arranged outside the stator, and the rotor connected to a motor shaft, characterized in that: The motor housing is composed of a front cover and a rear cover, the stator and the rotor are located in the front cover, a control circuit board is arranged in the rear cover, a circuit board bracket is arranged between the front cover and the rear cover, and the control circuit board is fixed on the circuit board bracket.

2. The brushless DC motor according to claim 1, characterized in that: The outer side of the circuit board bracket is provided with a plurality of external protrusions for connecting the front cover and the rear cover, and the external protrusions are provided with connection holes. The circuit board bracket is provided with a pipe groove connecting the two ends of the circuit board bracket.

3. The brushless DC motor according to claim 2, characterized in that: A plurality of inner protrusions for fixing the control circuit board are arranged on the inner side of the circuit board bracket.

4. The brushless DC motor according to claim 3, characterized in that: The rear end cover is provided with a commutator connected with the motor shaft.

5. The brushless DC motor according to claim 1, characterized in that: A support rod is installed at the lower part of the motor housing.

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