External Hall brushless direct current motor

Abstract

An external Hall brushless direct current motor comprises a motor body, a motor shaft and a rotor, the motor shaft and the rotor are arranged in the motor body, a data acquisition groove is formed in the rear end face of the motor body, the inner end of the motor shaft extends towards the rear end face of the motor to form an extension shaft, and the extension shaft penetrates through the rear end face of the motor and extends into the data acquisition groove; the data acquisition board is fixedly connected in the data acquisition groove, a through hole is formed in the data acquisition board, the extension shaft extends into the through hole, the extension shaft is sleeved with a Hall magnetic ring, and the data acquisition board is connected with a Hall component matched with the Hall magnetic ring. The data acquisition groove is formed in the middle of the outer end face of the motor rear cover, and the Hall element is arranged in the data acquisition groove, so that the Hall element is far away from the motor stator, and interference of stator magnetic leakage is avoided.

Description

Technical Field

[0001] The utility model relates to the field of direct current motors, in particular to an external Hall brushless direct current motor. Background Art

[0002] The existing DC motors mainly include brushed DC motors and brushless DC motors. Brushed DC motors require mechanical commutation such as a commutator to operate the motor, and long-term operation will cause the commutator to be worn out. Brushless DC motors use electronic commutation instead of mechanical commutation, and electronic commutation is divided into two types: inductive and non-inductive.

[0003] The inductive motor senses the state and position of the rotor through the Hall element inside the motor, while the inductive motor determines the rotor position and commutation phase through the electrically regulated back electromotive force signal. The inductive motor can know the position of the rotor when it is stationary, while the inductive motor can only determine it when it is rotating. The inductive motor will shake when it just starts, and it is more difficult to control at low speed. The inductive motor uses Hall element sensing, which can accurately determine the commutation position. Most of the Hall elements are assembled on the motor stator. There may be an angle deviation between the Hall commutation point and the three-phase zero crossing point of the motor. When the motor runs at high speed, the Hall element is easily disturbed by the stator leakage magnetic field, which affects the accuracy of the commutation. When the Hall is damaged, the entire motor needs to be disassembled and replaced, which is time-consuming and laborious. Utility Model Content

[0004] The utility model aims to reduce the interference of the motor stator on the Hall element, facilitate the adjustment of the Hall signal position, and ensure that the Hall signal is consistent with the three-phase zero-crossing signal. Therefore, an external Hall brushless DC motor is proposed. The specific technical solution is as follows:

[0005] An external Hall brushless DC motor comprises a motor body, a motor shaft and a rotor arranged in the motor body, and is characterized in that:

[0006] The rear end face of the motor body is provided with a data collection slot, the inner end of the motor shaft extends toward the rear end face of the motor to form an extension shaft, and the extension shaft passes through the rear end face of the motor and extends into the data collection slot;

[0007] The data acquisition board is fixedly connected in the data acquisition slot, the data acquisition board is provided with a through hole, the extension shaft extends into the through hole, a Hall magnetic ring is sleeved on the extension shaft, and a Hall component matching the Hall magnetic ring is connected to the data acquisition board.

[0008] In order to better implement the utility model, it can be further provided that: a sealing cover is fixedly connected to the notch of the data acquisition slot, and the sealing cover forms a closed dustproof space in the data acquisition slot.

[0009] Furthermore: the sealing cover is detachably connected to the notch of the data acquisition slot.

[0010] Furthermore, the motor body comprises a motor rear cover, the outer side surface of the motor rear cover is the rear end surface of the motor body, and the data acquisition slot is arranged in the middle of the outer end surface of the motor rear cover.

[0011] Furthermore: the data acquisition board is a circular ring structure, and the data acquisition slot is consistent with the structure of the data acquisition board.

[0012] Further:

[0013] The data acquisition board is evenly provided with four arc-shaped through grooves in a circumferential direction, each of which is provided with a locking piece, and the data acquisition board is fixedly connected in the data acquisition groove through the four locking pieces.

[0014] Furthermore: the data acquisition board has three mounting holes for mounting Hall components evenly distributed along the annular direction near the through hole, and the mounting holes are a three-hole structure.

[0015] Furthermore, a plurality of lead holes for welding lead wires and temperature control wires are provided between the arc-shaped through groove and the through hole of the data acquisition board.

[0016] Furthermore: the number of poles of the Hall magnetic ring is consistent with that of the rotor.

[0017] Furthermore: the locking member is a locking bolt.

[0018] The beneficial effects of the utility model are:

[0019] The data acquisition slot is opened in the middle of the outer end surface of the motor rear cover. By arranging the Hall element in the data acquisition slot, the Hall element is kept away from the motor stator to avoid interference from stator leakage magnetic field.

[0020] The data acquisition slot is opened in the middle of the outer end surface of the rear cover of the motor, and the data acquisition slot is sealed by a sealing cover. The sealing cover is easy to disassemble, which is convenient for zeroing the Hall signal. After opening the sealing cover, the Hall signal and the three-phase zero crossing point are consistent by rotating the Hall data acquisition board. At the same time, when the Hall is damaged, it is easy to replace, without disassembling the motor body, and the Hall element can be replaced from the data acquisition slot directly after removing the sealing cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the overall structure diagram of the utility model;

[0022] Figure 2 for Figure 1 Left side view with the sealing cover removed;

[0023] Figure 3 This is the structural diagram of the data acquisition board;

[0024] Figure 4 The first structural diagram of the Hall element connected to the data acquisition board;

[0025] Figure 5 The second structural diagram of the Hall element connected to the data acquisition board;

[0026] The accompanying drawings in the figure illustrate a motor housing 1, a motor shaft 2, an extension shaft 3, a stator 4, a rotor 5, a motor back cover 6, a sealing cover 7, a data acquisition slot 8, a data acquisition board 9, a mounting hole 10, a Hall element 11, a Hall magnetic ring 12, a locking piece 13, a first mounting hole 14, a second mounting hole 15, and an arc-shaped through slot 16. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the present utility model, it should be noted that the terms "vertical", "upper", "lower", "horizontal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present utility model. In addition, "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] like Figures 1 to 5 As shown:

[0030] An external Hall brushless DC motor comprises a motor body, wherein the motor body comprises a motor housing 1, a motor shaft 2, a stator 4, a rotor 5 and a motor back cover 6.

[0031] The rear end face of the motor body is provided with a data acquisition slot 8 , and the inner end of the motor shaft 2 extends toward the rear end face of the motor to form an extension shaft 3 , which passes through the rear end face of the motor and extends into the data acquisition slot 8 .

[0032] Specifically, the motor back cover 6 is installed on the motor housing 1, and the outer end face of the motor back cover 6 is the rear end face of the motor body. A data collection slot 8 is opened in the middle of the outer end face of the motor back cover 6, and a sealing cover 7 is fixedly connected to the notch of the data collection slot 8. The sealing cover 7 forms a closed dustproof space in the data collection slot 8.

[0033] The data acquisition board 9 is fixedly connected in the data acquisition slot 8. The data acquisition board 9 is a circular ring structure. The inner end of the motor shaft 2 extends toward the motor rear cover 6 to form an extension shaft 3. The extension shaft 3 passes through the motor rear cover 6 and extends into the through hole of the data acquisition board 9. A Hall magnetic ring 12 with the same number of poles as the rotor 5 is sleeved on the extension shaft 3. A Hall component 11 matching the Hall magnetic ring 12 is connected to the data acquisition board 9.

[0034] The data acquisition board 9 has three first mounting holes 14 evenly distributed along the circumferential direction near the through hole for mounting the Hall element 11 , and the first mounting holes 14 are a three-hole structure.

[0035] The data acquisition board 9 is evenly provided with arc-shaped through grooves 16 in the circumferential direction, and a locking piece 13 is provided in each arc-shaped through groove 16. The data acquisition board 9 is fixedly connected to the data acquisition slot 8 through the locking pieces 13. In order to facilitate the signal debugging of the Hall element, the locking pieces 13 are locking bolts. The locking bolts are respectively inserted into the corresponding arc-shaped through grooves 16 to fix the data acquisition board 9 in the data acquisition slot 8. When it is necessary to loosen the locking bolts, the data acquisition board 9 can rotate relative to the locking bolts, and the Hall signal is zeroed by rotating the data acquisition board 9 to meet the consistency of the Hall signal and the three-phase zero crossing point of the Hall data acquisition board 9. After the calibration is completed, the data acquisition board 9 is tightened by the locking bolts.

[0036] A plurality of second mounting holes 15 are provided between the arc-shaped through slot 16 and the circular hole of the data acquisition board 9 , and the second mounting holes 15 are used for welding lead-out wires and temperature control wires.

[0037] The working principle of the utility model is that the data acquisition slot 8 is opened in the middle of the outer end surface of the motor rear cover 6, and the Hall element 11 is arranged in the data acquisition slot 8, so that the Hall element is far away from the motor stator 4, avoiding the interference of the stator 4 leakage magnetic field. The data acquisition board 9 is installed in the data acquisition slot 8 of the motor rear cover 6, and the four arc-shaped through slots 16 are convenient for adjusting the data acquisition board 9. During debugging, by loosening the locking piece 13, the data acquisition board 9 can be rotated relative to the locking piece 13, and the adjustment is made so that the Hall signal position is guaranteed to be consistent with the signal of the three-phase zero crossing point.

[0038] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0039] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An external Hall brushless DC motor, comprising a motor body, a motor shaft and a rotor arranged in the motor body, characterized in that: The rear end face of the motor body is provided with a data collection slot, the inner end of the motor shaft extends toward the rear end face of the motor to form an extension shaft, and the extension shaft passes through the rear end face of the motor and extends into the data collection slot; The data acquisition board is fixedly connected in the data acquisition slot, the data acquisition board is provided with a through hole, the extension shaft extends into the through hole, a Hall magnetic ring is sleeved on the extension shaft, and a Hall component matching the Hall magnetic ring is connected to the data acquisition board.

2. According to claim 1, an external Hall brushless DC motor is characterized in that: A sealing cover is fixedly connected to the notch of the data collection slot, and the sealing cover forms a closed dustproof space in the data collection slot.

3. According to claim 2, an external Hall brushless DC motor is characterized in that: The sealing cover is detachably connected to the notch of the data acquisition slot.

4. According to claim 3, an external Hall brushless DC motor is characterized in that: The motor body comprises a motor rear cover, the outer side surface of the motor rear cover is the rear end surface of the motor body, and the data acquisition slot is arranged in the middle of the outer end surface of the motor rear cover.

5. According to claim 4, an external Hall brushless DC motor is characterized in that: The data acquisition board is a circular ring structure, and the data acquisition slot is consistent with the structure of the data acquisition board.

6. The external Hall brushless DC motor according to claim 5, characterized in that: The data acquisition board is evenly provided with four arc-shaped through grooves in a circumferential direction, each of which is provided with a locking piece, and the data acquisition board is fixedly connected in the data acquisition groove through the four locking pieces.

7. The external Hall brushless DC motor according to claim 6, characterized in that: The data acquisition board is evenly distributed with three mounting holes for mounting Hall components along the circumferential direction near the through hole, and the mounting holes are a three-hole structure.

8. The external Hall brushless DC motor according to claim 7, characterized in that: A plurality of lead holes for welding lead wires and temperature control wires are provided between the arc-shaped through groove and the through hole of the data acquisition board.

9. The external Hall brushless DC motor according to claim 8, characterized in that: The number of poles of the Hall magnetic ring is consistent with that of the rotor.

10. The external Hall brushless DC motor according to claim 9, characterized in that: The locking member is a locking bolt.

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