TWM566177U - Brushless motor of electric bicycle - Google Patents

Abstract

A brushless motor for an electric bicycle, wherein the brushless motor can be disposed on a five-way electric bicycle or an axle provided on the front and rear wheels, wherein the brushless motor comprises: a casing, a certain subunit, and a rotor. The unit, a sensing magnet and a sensing module. The stator unit is fixed in the housing, the rotor unit has a rotating shaft, the rotor unit is coaxial with the stator unit and rotatably disposed in the stator unit, and the sensing magnet is fixed on one end of the driving shaft of the rotor unit and can be coupled to the driving shaft The coaxial pivoting, sensing module and the sensing magnet are disposed adjacent to the axial direction of the driving shaft but are not in contact with each other on the outer side of the housing.

Description

Brushless motor for electric bicycle

The present invention relates to a motor for an electric bicycle, and more particularly to a structure of a brushless motor for an electric bicycle.

In recent years, due to the improvement of health and environmental awareness, mobile bicycles such as electric bicycles that are both sporty and do not emit exhaust gas have been loved by many people. Most of the current electric bicycles are used to reduce the physical strength of the users through the motor-assisted output. Burden, however, the advantages and disadvantages of the motor will affect the conversion efficiency of the power, but also affect the smoothness of the riding ground, which has a very important position.

Compared with the conventional brush motor, the brushless motor has high efficiency and torque density, and is therefore widely used in electric bicycles, in order to accurately grasp the pivot position of the rotor to maintain the commutation of the magnetic pole continuity on the stator. Demand, the current practice is to install three Hall sensors between the stator teeth, through the signal obtained by the Hall sensor to infer the position of the rotor pivot. However, when the Hall sensor fails or needs to be calibrated, the user must first disassemble the motor housing and separate the stator from the rotor before replacing and repairing the Hall sensor. The components are assembled back. These processes are not only time-consuming and labor-intensive, but also because the relative positions of the Hall sensor, the sensing magnet, the stator and the rotor are quite strictly limited, so the process of reassembling back needs to be strictly Tuning, also because the traditional motor is not conducive to maintenance, so although only Hall sensor failure, but most users prefer to directly eliminate the existing motor and replace it with a brand new motor, which also causes waste of resources and motor The amount of scrapped has increased.

The reason is that the purpose of this creation is to provide a brushless motor for an electric bicycle, which has the effect of facilitating maintenance and reducing the amount of scrap.

In order to achieve the above object, the present invention provides a brushless motor for an electric bicycle, which can be disposed on a five-way of the electric bicycle or an axle provided on the front and rear wheels, and is characterized in that the brushless motor The utility model comprises a casing, a certain subunit, a rotor unit, a sensing magnet and a sensing module. The stator unit is fixed in the housing, the rotor unit has a rotating shaft, and the rotor unit is coaxially and rotatably disposed in the stator unit, and the sensing magnet is fixed to the driving of the rotor unit. One end of the shaft is coaxially pivotable with the drive shaft, and the sensing module is disposed on the outer side of the housing adjacent to the sensing magnet along the axial direction of the drive shaft but not in contact with the drive shaft.

Through the foregoing structural features, when the sensing module fails or needs to be adjusted, the user only needs to replace or adjust the sensing module disposed on the outer side of the housing without additional housing. And the components in the housing are disassembled, so that the maintenance is convenient, so that the user is more willing to choose to repair the existing motor instead of directly replacing it with a brand new motor, so that the existing motor can be reduced. Retirement opportunities to reduce the amount of scrap.

Optionally, the sensing magnet has a pair of sensing magnetic poles (N magnetic poles and S magnetic poles), the pair of sensing magnetic poles being distributed along a radial direction of the driving shaft.

Optionally, the housing is formed with a first accommodating space, and the stator unit is received in the first accommodating space.

Optionally, the housing has a through hole penetrating the housing and communicating with the first receiving space, and the sensing magnet is disposed in the through hole.

Optionally, the housing includes a first cover body, a cylindrical body and a second cover body, and the first cover body, the cylindrical body and the second cover body together form the first accommodating space, the through hole Located on the second cover.

Optionally, the sensing module can acquire the direction and the pivoting speed of the sensing magnetic pole of the sensing magnet.

Optionally, the brushless motor includes a third cover body disposed on an outer side of the housing and forming a second receiving space with the housing.

Optionally, the sensing module includes a sensing chip and a printed circuit board, and the sensing module is disposed in the second receiving space.

Optionally, the sensing module has a microprocessor and a storage unit, and the microprocessor is electrically connected to the storage unit and the sensing chip.

Optionally, the sensing module is perpendicular to an axial direction of the driving shaft and parallel to the magnetic pole.

The detailed construction, characteristics, assembly or use of the brushless motor for the electric bicycle provided by this creation will be described in the following description. However, those of ordinary skill in the art should understand that the detailed description and specific embodiments of the present invention are merely used to illustrate the present invention and are not intended to limit the scope of the patent application.

It should be noted that the terms used in the description provided by the present application are all illustrative terms that can be understood by those of ordinary skill in the art, and the "front", "upper", Directional descriptions such as "down", "back", "left", "right", "top", "bottom", "inside", and "outside" are merely illustrative examples based on normal usage directions. The term is not intended to limit the scope of the claim.

In addition, the singular forms "a", "the" and "the" Thus, for example, reference to "a" or "an" or "an" All conjunctions used in similar instances should also be understood in the broadest sense, and the particular shapes and structural features or technical terms described in the description should also be understood to include the function of the particular structure or technical term. Equivalent to a replacement structure or technical term.

Please refer to the drawings first. FIG. 1 is a schematic structural view of the brushless motor 1 of the electric bicycle of the present embodiment. A brushless motor 1 for an electric bicycle according to the embodiment of the present invention, the brushless motor 1 can be disposed on a five-way of the electric bicycle or an axle (not shown) provided on the front and rear wheels, and transmits the The brush motor 1 drives the chain or the wheel to assist the user in riding.

The brushless motor 1 includes a housing 10, a certain subunit 22, a rotor unit 30, a sensing magnet 40, a sensing module 50, and a control unit (not shown).

The housing 10 is formed with a first accommodating space 12 . The housing 10 has a through hole 14 extending through the housing 10 and communicating with the first accommodating space 12 . The housing 10 can be made of, but not limited to, plastic, metal, composite materials, or combinations thereof. In the embodiment, the housing 10 includes a first cover 102, a cylinder 104 and a second cover 106. The first cover 102, the cylinder 104 and the second cover 106 are formed together. The first accommodating space 12 is located on the second cover 106, but the practical application is not limited thereto, and the housing may also be a bowl-shaped body (not shown) and an end cover (Fig. The hole is formed on the end cover.

The stator unit 22 is received in the first accommodating space 12 of the housing 10. The stator unit 22 has a plurality of stator teeth (not shown), and the number of the stator teeth can be but not Limited to a multiple of 3, coils are wound around each of the stator teeth, and the coils constitute a U-phase winding, a V-phase winding and a W-phase winding.

The rotor unit 30 includes a drive shaft 32 and a plurality of permanent magnets 34 spaced apart from the drive shaft 32. The rotor unit 30 is coaxially and rotatably disposed in the stator unit 22. In this embodiment, the housing 10 further includes a first bearing 16 and a second bearing 18. The first bearing 16 is disposed on the first cover 102, and the second bearing 18 is disposed on the second cover. The rotor unit 30 is rotatably disposed in the housing 10 through the first bearing 16 and the second bearing 18. The rotor unit 30 is also accommodated in the first accommodating space. 12 in.

Referring to FIG. 2 together, the sensing magnet 40 is fixed to an end surface of the driving shaft 32 of the rotor unit 30 and can be coaxially pivoted with the driving shaft 32. The sensing magnet 40 has a relative sensing magnetic pole. (As shown in FIG. 3), the sensing magnetic pole includes an N magnetic pole and an S magnetic pole, and the extending direction from the S magnetic pole to the N magnetic pole is defined as the direction 42 of the sensing magnetic pole of the sensing magnet 40 (eg, In the third embodiment, the pair of sensing magnets are distributed along the radial direction of the driving shaft 32. In this embodiment, the sensing magnet 40 is disposed in the through hole 14 of the second cover 106. In other possible embodiments, the sensing magnet 40 may protrude outside the through hole 14 or may not be protruded into the first receiving space 12 .

The sensing module 50 is disposed on the outer side of the second cover 106 of the housing 10 adjacent to the axial direction of the drive shaft 32 of the rotor unit 30 but not in contact with the sensing magnet 40. The test module 50 is perpendicular to the axial direction of the drive shaft 32 and is parallel to the sensing magnetic pole. The sensing module 50 and the second cover 106 can be used by, but not limited to, soldering, screwing, plugging, and the like. The sensing module 50 includes a sensing chip 52, a printed circuit board 54, a microprocessor (not shown), and a storage unit (not shown) electrically connected to the sensing chip. The sensing module 50 can obtain the direction 42 and the pivoting speed of the sensing magnetic pole of the sensing magnet 40 through the sensing module 52. In this embodiment, the sensing module 50 is selected. AsahiKASEI's AK7451 model, which can sense information such as the position and pivoting state of the magnet 40, but users can also choose other products with similar functions.

The sensing unit (not shown) is electrically connected to the sensing module 50 for receiving the sensing data and the operation result of the sensing module 50, and is combined with the sensing module 50 to sense The real-time information of the position of the sensing magnet 40 controls the operation of the brushless motor 1, in particular, the phase switching point of the U-phase winding, the V-phase winding and the W-phase winding.

It should be noted that, in order to reduce the risk of damage caused by the impact of the external force of the sensing module 50, the brushless motor 1 of the present invention may further include a third cover 20, the third cover 20 is detachably The second cover body 20 and the second cover body 106 form a second accommodating space 202, and the sensing module 50 is received in the outer cover 106. In the second accommodating space 202, the protection of the third cover 20 reduces the chance of damage to the sensing module 50.

In summary, the above-mentioned structural features, when the sensing module 50 fails or needs to be adjusted, the user only needs to disassemble the third cover 20, and the sensing module 50 can be used for the sensing module 50. Replacement or repair, so the steps of disassembling and separating the components such as the housing, the stator unit and the rotor unit can be omitted. It is obvious that the creation has the effect of convenient maintenance, and the user is more willing to choose because of the convenience of maintenance. Repairing existing motors instead of directly replacing them with new ones can also reduce the chances of existing motors being scrapped and reduce the amount of scrap.

Finally, it must be re-arranged that the constituent elements disclosed in the foregoing embodiments are merely illustrative and are not intended to limit the scope of the patents of the present invention, and any simple structural retouching or variation that has not been removed from the spirit of the present invention, or Replacement with other equivalent components is still within the scope of this patent application.

1‧‧‧Brushless motor
10‧‧‧shell
102‧‧‧First cover
104‧‧‧Cylinder
106‧‧‧Second cover
12‧‧‧First accommodation space
14‧‧‧Perforation
16‧‧‧First bearing
18‧‧‧second bearing
20‧‧‧ third cover
202‧‧‧Second accommodating space
22‧‧‧STAR unit
30‧‧‧Rotor unit
32‧‧‧Drive shaft
34‧‧‧ permanent magnet
40‧‧‧Sensing magnet
42‧‧‧Sensing the direction of the magnetic pole
50‧‧‧Sensor module
52‧‧‧Inductive Wafer
54‧‧‧Printed circuit board

The brushless motor of the electric bicycle provided by the present invention will be further described below with reference to the embodiments and the drawings. FIG. 1 is a schematic structural view of the brushless motor of the electric bicycle according to the illustrated embodiment. Fig. 2 is a partial side elevational view of the brushless motor of the electric bicycle of the illustrated embodiment, mainly showing the structure of the drive shaft and the sensing magnet. Fig. 3 is a side view taken along the plane shown by the line 3-3 of Fig. 2.

Claims (10)

A brushless motor for an electric bicycle, the brushless motor being disposed on the five-way of the electric bicycle or the axle provided on the front and rear wheels, wherein the brushless motor comprises: a casing; a certain subunit Fixed in the housing; a rotor unit having a drive shaft coaxial with the stator unit and rotatably disposed in the stator unit; a sensing magnet fixed to the drive of the rotor unit An end surface of the shaft is coaxially pivotable with the drive shaft; and a sensing module is disposed on an outer side of the housing adjacent to the sensing magnet adjacent to the axial direction of the drive shaft. The brushless motor of claim 1, wherein the sensing magnet has an opposite sensing magnetic pole (N magnetic pole and S magnetic pole), and the pair of sensing magnetic poles are distributed along a radial direction of the driving shaft. The brushless motor of claim 1, wherein the housing is formed with a first accommodating space, and the stator unit is received in the first accommodating space. The brushless motor of claim 3, wherein the housing has a through hole penetrating the housing and communicating with the first receiving space, and the sensing magnet is disposed in the through hole. The brushless motor of claim 4, wherein the housing comprises a first cover body, a cylinder body and a second cover body, the first cover body, the cylinder body and the second cover body The first accommodating space is formed together, and the through hole is located on the second cover. The brushless motor of claim 2, wherein the sensing module obtains a direction and a pivoting speed of the sensing magnetic pole of the sensing magnet. The brushless motor of claim 1, wherein the brushless motor comprises a third cover body disposed on an outer side of the housing and forming a second receiving space with the housing. . The brushless motor of claim 7, wherein the sensing module comprises a sensing chip and a printed circuit board, and the sensing module is disposed in the second receiving space. The brushless motor of claim 8, wherein the sensing module has a microprocessor and a storage unit, and the microprocessor is electrically connected to the storage unit and the sensing chip. The brushless motor of claim 2, wherein the sensing module is perpendicular to an axial direction of the driving shaft and parallel to the sensing magnetic pole.