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, the control circuit board is fixed on the circuit board support, the motor shaft is matched and positioned with the front end cover through an end face sealing head, the motor shaft is sleeved with an oil cup support, an opening in one end of the oil cup support is attached to the end face of the front end cover to form an oil storage cavity, and the end face sealing head is located in the oil cup support. The stator is fixed on the outer side of the oil cup support, and the oil cup support is internally provided with an oil bearing used for being connected with a motor shaft. According to the direct current brushless motor, the overall space occupation of equipment can be reduced; the lubricating oil is stored through the oil cup support structure, so that the frequency of adding the lubricating oil can be greatly reduced, the motor is convenient to maintain, and the use cost is reduced.

Description

Technical Field

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

[0002] Brushless DC motors have been widely used in home appliances, industrial equipment, automotive electronics, etc. due to their high efficiency, high reliability and long life. Traditional brushless DC motors usually include components such as stators, rotors and position sensors, and their control circuits are responsible for adjusting the speed and torque of the motor to meet different working requirements.

[0003] In traditional designs, the motor control circuit is installed outside the motor and connected to the motor through wires. Although this layout can simplify the manufacture and maintenance of the motor, it also has some problems: (1) Space occupation: The external control circuit requires additional space, which increases the overall size and weight for space-constrained application scenarios such as portable devices or precision instruments; (2) Electromagnetic interference: The wiring of the external circuit may increase electromagnetic interference (EMI), affecting the performance of the motor and other electronic devices; (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 life of the motor.

[0004] In addition, although brushless DC motors are designed to reduce maintenance requirements, they still require regular maintenance to maintain optimal performance. A common problem is the friction between the motor shaft and the end seal head, which usually requires regular addition of lubricating oil to reduce. However, due to the lack of an effective structure to store lubricating oil, this leads to frequent maintenance of the motor, increasing the complexity and cost of operation. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a brushless DC motor, which can combine a control circuit into the motor to reduce space occupation and improve the working stability and life of the motor; moreover, it has a structure for storing lubricating oil, so that the motor is easy to maintain and the use cost is reduced.

[0006] In order to solve the above technical problems, the utility model provides a brushless DC motor, including a motor housing, a stator installed in the motor housing, a rotor arranged outside the stator, and the rotor connected to the motor shaft. The motor housing is composed of a front end cover and a rear end cover, the stator and the rotor are located in the front end cover, a control circuit board is arranged in the rear end cover, a circuit board bracket is arranged between the front end cover and the rear end cover, the control circuit board is fixed on the circuit board bracket, the motor shaft is positioned with the front end cover through an end face sealing head, an oil cup support is mounted on the motor shaft, one end opening of the oil cup support is fitted with the end face of the front end cover to form an oil storage cavity, the end face sealing head is located in the oil cup support, the stator is fixed to the outside of the oil cup support, and an oil-containing bearing for connecting the motor shaft is arranged in the oil cup support.

[0007] 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 have connection holes, and the circuit board bracket is provided with pipe grooves for connecting the two ends of the circuit board bracket. The design of the external protrusions and the connection holes can provide a more stable connection method, so that the connection between the front cover and the rear cover and the circuit board bracket is more firm, reducing the looseness of the structure caused by vibration or impact, and the pipe grooves connecting the two ends of the circuit board bracket can allow the wires to pass through, forming effective protection for the wires.

[0008] The inner side of the circuit board bracket is provided with a plurality of inner protrusions for fixing the control circuit board. The inner protrusions can provide accurate positioning for the control circuit board, ensure the correct relative position relationship between the circuit board and other motor components, thereby ensuring the assembly accuracy and operating performance of the motor.

[0009] The oil cup support is a step-shaped structure, the end of the oil cup support with a larger diameter is fitted with the end surface of the front cover, and the stator is fixed to the end of the oil cup support with a smaller diameter. This structure can make full use of the space inside the motor to store more lubricating oil.

[0010] The rear end cover is equipped with a commutator connected to the motor shaft, which can steer the output power of the motor to meet different working requirements.

[0011] A support rod is installed at the lower part of the motor housing, which can facilitate the installation and use of the motor.

[0012] The beneficial effects of the utility model are as follows: a circuit board bracket is used in the brushless DC motor to install the control circuit board in the motor housing, which can reduce the overall space occupied by the equipment, reduce the electromagnetic interference generated by the operation of the motor, and is beneficial to improving the working stability and life of the motor; an oil cup support is mounted on the motor shaft, and the lubricating oil is stored through the oil cup support structure, which can greatly reduce the frequency of adding lubricating oil, making the motor easy to maintain and reducing the cost of use; an oil-containing bearing is used to replace the traditional deep groove ball bearing, and the matching tolerance requirements of the motor shaft and the bearing are low, which is beneficial to improving the production efficiency and yield rate of the product, and can effectively reduce the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0014] Figure 1 It is a structural schematic diagram of the utility model;

[0015] Figure 2 It is a cross-sectional structural schematic diagram of the utility model;

[0016] Figure 3 It is a schematic diagram of the structure of the circuit board bracket;

[0017] Figure 4 It is a structural diagram of the oil cup support. DETAILED DESCRIPTION

[0018] Reference Figures 1 to 4 The brushless DC motor of the utility model comprises a motor housing 1, a stator 2 is installed in the motor housing 1, a rotor 3 is arranged outside the stator 2, the rotor 3 is connected to the 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 in the front end cover 11, a control circuit board 5 is arranged in the rear end cover 12, a circuit board bracket 6 is arranged between the front end cover 11 and the rear end cover 12, the control circuit board 5 is fixed on the circuit board bracket 6, the motor shaft 4 is positioned with the front end cover 11 through the end face sealing head 7, an oil cup support 8 is mounted on the motor shaft 4, one end opening of the oil cup support 8 is fitted with the end face of the front end cover 11 to form an oil storage cavity, the end face sealing head 7 is located in the oil cup support 8, the stator 2 is fixed to the outside of the oil cup support 8, and an oil-containing bearing for connecting the motor shaft 4 is arranged in the oil cup support 8.

[0019] In this embodiment, the circuit board bracket 6 is provided with a plurality of external protrusions 61 for connecting the front cover 11 and the rear cover 12, and the external protrusions 61 have connection holes 62, and the circuit board bracket 6 is provided with a tube groove 63 for connecting the two ends of the circuit board bracket. The circuit board bracket 6 is provided with a plurality of internal protrusions 64 for fixing the control circuit board 5 on the inner side.

[0020] The oil cup support 8 is a step-shaped structure, the end of the oil cup support 8 with a larger diameter is fitted with the end surface of the front cover 11, and the stator 2 is fixed to the end of the oil cup support 8 with a smaller diameter. The rear cover 12 is equipped with a commutator 9 connected to the motor shaft 4. A support rod 10 is installed at the lower part of the motor housing 1.

[0021] The above description is only a preferred implementation mode of the present utility model. Any technical solution that achieves the purpose of the present utility model by basically the same means belongs to the protection scope of the present utility model.

Claims

1. A brushless DC motor, comprising a motor housing, a stator mounted in the motor housing, a rotor disposed outside the stator, and a motor shaft connected to the rotor, characterized in that: The motor housing is composed of a front end cover and a rear end cover, the stator and the rotor are located in the front end cover, a control circuit board is arranged in the rear end cover, a circuit board bracket is arranged between the front end cover and the rear end cover, the control circuit board is fixed on the circuit board bracket, the motor shaft is positioned with the front end cover through an end face sealing head, an oil cup support is mounted on the motor shaft, one end opening of the oil cup support is fitted with the end face of the front end cover to form an oil storage cavity, the end face sealing head is located in the oil cup support, the stator is fixed to the outside of the oil cup support, and an oil-containing bearing for connecting the motor shaft is arranged in the oil cup support.

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 oil cup support is a step-shaped structure, the end of the oil cup support with a larger diameter is fitted with the end surface of the front end cover, and the stator is fixed to the end of the oil cup support with a smaller diameter.

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

6. 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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