阅读说明：本技术 无刷直流电机霍尔传感器的安装结构 (Mounting structure of brushless direct current motor hall sensor ) 是由 项乐宏 赵宏江 郭伟群 于 2021-08-06 设计创作，主要内容包括：本发明公开了一种无刷直流电机霍尔传感器的安装结构,底面有贴片式的霍尔传感器的霍尔板安装在电机定子线圈边缘的绝缘骨架上,霍尔传感器与电机转子铁芯上端面的磁钢之间有间隙,霍尔传感器位于电机转子铁芯的磁钢的上方；霍尔板为扇形,三个贴片式的霍尔传感器在扇形的霍尔板外圆弧边缘的底面；霍尔板的上表面的水平位置低于电机定子线圈顶端面的水平位置；绝缘骨架的霍尔板安装处上端面有轴向限位台阶；绝缘骨架上有多个向上的凸柱,霍尔板上有多个与凸柱一一对应的通孔,多个通孔套合在各自凸柱上后,热压凸柱顶端将霍尔板与绝缘骨架固定。本安装结构能防止电机定子对霍尔传感器传导热、轴向占用空间小、结构简单和安装工艺简单。(The invention discloses a mounting structure of a brushless direct current motor Hall sensor.A Hall plate with a surface mount type Hall sensor on the bottom surface is mounted on an insulating framework at the edge of a motor stator coil, a gap is reserved between the Hall sensor and magnetic steel on the upper end surface of a motor rotor core, and the Hall sensor is positioned above the magnetic steel of the motor rotor core; the Hall plate is fan-shaped, and the three surface-mounted Hall sensors are arranged on the bottom surface of the outer circular arc edge of the fan-shaped Hall plate; the horizontal position of the upper surface of the Hall plate is lower than that of the top end surface of the stator coil of the motor; an axial limiting step is arranged on the upper end face of the Hall plate mounting position of the insulating framework; the insulating framework is provided with a plurality of upward convex columns, the Hall plate is provided with a plurality of through holes which are in one-to-one correspondence with the convex columns, the Hall plate and the insulating framework are fixed at the top ends of the hot-pressing convex columns after the through holes are sleeved on the convex columns respectively. The mounting structure can prevent the motor stator from conducting heat to the Hall sensor, and has the advantages of small axial occupied space, simple structure and simple mounting process.)

1. The utility model provides a brushless DC motor hall sensor's mounting structure which characterized in that: the Hall plate with the surface mounted Hall sensor on the bottom surface is arranged on an insulating framework at the edge of a motor stator coil, a gap is reserved between the Hall sensor and the magnetic steel on the upper end surface of the motor rotor core, and the Hall sensor is positioned above the magnetic steel of the motor rotor core.

2. The mounting structure of the hall sensor of the brushless dc motor according to claim 1, wherein: the Hall plate is fan-shaped, and three SMD Hall sensors are arranged on the bottom surface of the outer circular arc edge of the fan-shaped Hall plate.

3. The mounting structure of the hall sensor of the brushless dc motor according to claim 1, wherein: the horizontal position of the upper surface of the Hall plate is lower than the horizontal position of the top end surface of the stator coil of the motor.

4. The mounting structure of the hall sensor of the brushless dc motor according to claim 3, wherein: an axial limiting step is arranged on the upper end face of the Hall plate mounting position of the insulating framework.

5. The mounting structure of the hall sensor of the brushless dc motor according to claim 1, wherein: the insulating framework is provided with a plurality of upward convex columns, the Hall plate is provided with a plurality of through holes which are in one-to-one correspondence with the convex columns, the Hall plate and the insulating framework are fixed at the top ends of the hot-pressing convex columns after the through holes are sleeved on the convex columns respectively.

6. The mounting structure of the hall sensor of the brushless dc motor according to claim 1, wherein: the insulating framework is provided with a plurality of inward lugs which are limited in radial direction and circumferential direction, the outer arc edge of the Hall plate is provided with a plurality of notches which are matched with the lugs, and the notches are matched with the lugs to limit the Hall plate in radial direction and circumferential direction.

7. The mounting structure of the hall sensor of the brushless dc motor according to claim 1, wherein: the upper surface of the Hall plate is provided with a female socket which is used for being plugged with a male plug to be connected with a Hall wiring rapidly.

Technical Field

The invention relates to the technical field of brushless direct current motors, in particular to a mounting structure of a hall sensor of a brushless direct current motor.

Background

The mounting structure of the hall sensor of the brushless direct current motor in the prior art generally welds the hall sensor on a hall plate, and then installs the hall plate in a tooth slot of a stator core, or on a stator coil, or on a motor end cover.

However, the above prior art mounting structures still have their respective disadvantages:

the Hall plate is installed in the tooth's socket of stator core, and easy conduction heat gives Hall sensor, and the tooth's socket fuel factor leads to Hall sensor inefficacy easily, and influences the stability and the reliability of motor work, and this structure can only use contact pin formula Hall sensor, and plug-in Hall sensor's Hall plate needs manual installation, and the mounting process is complicated, and the installation effectiveness is low, is easy to be punctured by the static during the installation and causes the trouble.

The Hall plate is installed on a stator coil, the stator coil is easy to damage, heat is also easy to conduct to the Hall sensor, the Hall sensor is easy to lose efficacy, the working stability and reliability of the motor are affected, the structure can only use the contact pin type Hall sensor, the Hall plate of the plug-in Hall sensor needs to be installed manually, the installation process is complex, the installation efficiency is low, and faults are caused by electrostatic breakdown easily during installation. The mounting structure has the defect that the Hall sensor can sense the magnetic field only by being inserted into the slot of the stator core, the requirement on the mounting space of the motor is high, the size of the Hall plate can be large, the axial size of the motor is increased, the material cost is increased, and the reversing precision of the motor is also influenced.

The Hall plate is installed on the end cover of the motor, a special containing space and a connecting structure are needed, the installation structure is complex, the installation process is complex, the installation efficiency is low, the requirement on the installation space of the motor is high, the size of the Hall plate can be large, the axial size of the motor is increased, the material cost is increased, the axial distance between the Hall plate and rotor magnetic steel is large, and the reversing precision of the motor is difficult to guarantee.

Disclosure of Invention

The invention aims to solve the technical problem of providing the installation structure of the brushless direct current motor Hall sensor, which can prevent the motor stator from conducting heat to the Hall sensor, has small axial occupied space, simple structure and simple installation process.

The technical scheme includes that the mounting structure of the Hall sensor of the brushless direct current motor is provided, a Hall plate with a surface-mounted Hall sensor on the bottom surface is mounted on an insulating framework at the edge of a stator coil of the motor, a gap is reserved between the Hall sensor and magnetic steel on the upper end surface of a rotor core of the motor, and the Hall sensor is positioned above the magnetic steel of the rotor core of the motor.

After the structure is adopted, the mounting structure of the brushless direct current motor Hall sensor has the following advantages: the Hall plate is arranged on an insulating framework, namely a non-metal framework such as a plastic framework, so that the heat conduction of the motor stator to the Hall sensor is effectively prevented, the good working environment and the stable and reliable working state of the Hall sensor are effectively ensured, and the working stability and reliability of the brushless direct current motor are ensured. The stator coil is not easy to be damaged or injured. A gap is reserved between the Hall sensor and the upper end face of the rotor core, the Hall sensor is located right above the rotor core of the motor, the requirement on the installation space of the motor is low, the axial occupied space is small, the size of the Hall plate can be relatively reduced, the axial size of the motor is reduced, and the material cost is reduced. Meanwhile, the axial distance is short, the response is sensitive and accurate, and the reversing precision of the motor is greatly improved. The mounting structure of the invention has simple structure and simple mounting process, overcomes the defect that the fault is easily caused by electrostatic breakdown during mounting, and greatly improves the mounting efficiency.

Furthermore, the Hall plate is fan-shaped, and the three SMD Hall sensors are arranged on the bottom surface of the outer circular arc edge of the fan-shaped Hall plate. After the structure is adopted, for the arc edge in the Hall plate, the bottom surface magnetic field induction of the three surface-mounted Hall sensors at the arc edge outside the fan-shaped Hall plate is relatively good, the three-phase brushless direct current motor can satisfactorily achieve the function of detecting six phase change positions by using the three Hall sensors, the phase change precision of the motor is further improved, the Hall plate is small in size, the cost is saved, and the structure is simple and convenient to install.

Further, the horizontal position of the upper surface of the Hall plate is lower than the horizontal position of the top end surface of the stator coil of the motor. After the structure is adopted, the axial space occupied by the Hall sensor mounting structure is reduced, the axial volume of the motor is reduced, the Hall sensor is less influenced by the heat of a stator coil of the motor, and the sensor and the motor work more stably and reliably.

Furthermore, an axial limiting step is arranged on the upper end face of the Hall plate mounting position of the insulating framework. After the structure above is adopted, when the Hall plate is installed, as long as the Hall plate is attached to the axial limiting step, the axial position of the Hall plate is determined, the installation process is simpler and more convenient, the universality and the consistency of the installation structure are good, the detection precision of the Hall sensor is further improved, and the commutation precision of the motor is further improved.

Furthermore, a plurality of upward convex columns are arranged on the insulating framework, a plurality of through holes which are in one-to-one correspondence with the convex columns are arranged on the Hall plate, after the through holes are sleeved on the convex columns, the top ends of the hot-pressing convex columns fix the Hall plate and the insulating framework. After the structure is adopted, when the Hall plate is installed, the Hall plate and the insulating framework are fixed simply, quickly and conveniently, the installation efficiency is high, the universality and consistency of the installation structure are better, the Hall plate is positioned more accurately relative to the radial position and the circumferential position of the insulating framework, the detection precision of the Hall sensor is further improved, and the commutation precision of the motor is further improved.

Furthermore, a plurality of radial and circumferential limiting and inward lugs are arranged on the insulating framework, a plurality of notches matched with the lugs are arranged on the edge of the outer arc of the Hall plate, and the notches are matched with the lugs to limit the Hall plate in the radial direction and the circumferential direction. After the structure more than adopting, when the hall plate is installed, the hall plate is more simply and conveniently fixed with the insulating framework, the installation efficiency is higher, the universality and the consistency of the installation structure are better, the hall plate is more accurately positioned relative to the radial position and the circumferential position of the insulating framework, the detection precision of the hall sensor is further improved, and further the commutation precision of the motor is further improved.

Furthermore, the upper surface of the Hall plate is provided with a female socket which is used for being plugged with a male plug to be quickly connected with the Hall wiring. By adopting the structure, the mounting structure is convenient and quick in wiring, so that the mounting process is simpler and the mounting efficiency is higher.

Drawings

Fig. 1 is a schematic longitudinal sectional view of a brushless dc motor to which the mounting structure of the present invention is attached.

Fig. 2 is a schematic diagram showing a part of an explosion structure of a brushless dc motor with the mounting structure of the present invention.

Fig. 3 is a schematic diagram showing a part of an explosion structure of a brushless dc motor with the mounting structure of the present invention.

Fig. 4 is a schematic structural diagram of the hall plate in fig. 3 after being turned by 90 °.

Fig. 5 is a schematic structural diagram of the hall plate in fig. 3 after being turned by 180 °.

Shown in the figure: 1. the motor business turn over connecting wire, 2, hall board, 3, motor upper end cover, 4, motor stator coil, 5, motor lower end cover, 6, motor rotor iron core, 7, lug, 8, projection, 9, insulating skeleton, 10, breach, 11, female socket, 12, through-hole, 13, magnet steel, 14, the spacing step of axial, 15, hall sensor.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings. It is to be noted that the description of the embodiments is provided to aid understanding of the present invention, and is not intended to limit the present invention. In addition, the technical features involved in the respective embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in fig. 1, 2, 3, 4 and 5.

The brushless direct current motor such as a flat brushless direct current motor provided with the Hall sensor mounting structure comprises a motor inlet and outlet connecting wire 1, a motor upper end cover 3, a motor lower end cover 5, a motor stator coil 4 positioned on the excircle of a motor body, a motor rotor core 6 positioned in the center of the motor body and a plurality of magnetic steels 13 which are fixed on the edge of the upper end of the motor rotor core 6 and are uniformly arranged along the circumference. The brushless dc motor is also called a brushless dc motor, and is called a brushless motor for short. The motor stator coil 4 is also called an electronic stator coil.

The invention relates to a mounting structure of a brushless direct current motor Hall sensor.A Hall plate 2 with a surface mount type Hall sensor 15 on the bottom surface is mounted on an insulating framework 9 at the edge of a motor stator coil 4, a gap is arranged between the Hall sensor 15 and a magnetic steel 13 on the upper end surface of a motor rotor iron core 6, and the Hall sensor 15 is positioned above the magnetic steel 13 of the motor rotor iron core 6. The hall sensor 15 is also called a hall element. The hall plate 2 is also called a circuit board, or called a PCB, or called a hall circuit board, or called a mounting circuit board, or called a hall mounting board, or called a hall bracket, or called a hall mounting bracket, or the like. It will be appreciated that the patches are welded by an automatic welding device, and the insulating frame 9 is made of a non-metallic material such as plastic, so that it has heat insulating properties and does not conduct heat.

The hall plate 2 is preferably fan-shaped, and three patch type hall sensors 15 are arranged on the bottom surface of the outer arc edge of the fan-shaped hall plate 2. The length dimension of the segment of the sector-shaped hall plate 2 is preferably shorter than the dimension of the radial arc length of the outer circumference of the rotor core.

The horizontal position of the upper surface of the Hall plate 2 is lower than the horizontal position of the top end surface of the motor stator coil 4.

An axial limiting step 14 is arranged on the upper end face of the installation position of the Hall plate 2 of the insulating framework 9. It is understood that the plurality of limiting steps 14 at the plurality of top ends of the insulating skeleton 9 are on the same horizontal plane.

The insulating framework 9 is provided with a plurality of upward convex columns 8, the Hall plate 2 is provided with a plurality of through holes 12 which are in one-to-one correspondence with the convex columns 8, after the through holes 12 are sleeved on the convex columns 8 respectively, the top end of the hot-pressing convex column 8 fixes the Hall plate 2 and the insulating framework 9.

A plurality of radial and circumferential limiting and inward lugs 7 are arranged on the insulating framework 9, a plurality of notches 10 matched with the lugs 7 are arranged on the outer arc edge of the Hall plate 2, and the notches 10 are matched on the respective lugs 7 to limit the Hall plate 2 in the radial direction and the circumferential direction.

The upper surface of the Hall plate 2 is provided with a female socket 11 which is used for being plugged with a male plug to be quickly connected with a Hall wire.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.