CN216625523U - Motor and electric bicycle - Google Patents

Motor and electric bicycle Download PDF

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Publication number
CN216625523U
CN216625523U CN202123195609.3U CN202123195609U CN216625523U CN 216625523 U CN216625523 U CN 216625523U CN 202123195609 U CN202123195609 U CN 202123195609U CN 216625523 U CN216625523 U CN 216625523U
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CN
China
Prior art keywords
magnetic
magnetic ring
motor
angle sensor
rotor
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Active
Application number
CN202123195609.3U
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Chinese (zh)
Inventor
黄玮
范清泉
刘海量
王洪晓
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Welling Motor Manufacturing Co Ltd
Welling Wuhu Motor Manufacturing Co Ltd
Original Assignee
Guangdong Welling Motor Manufacturing Co Ltd
Welling Wuhu Motor Manufacturing Co Ltd
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Application filed by Guangdong Welling Motor Manufacturing Co Ltd, Welling Wuhu Motor Manufacturing Co Ltd filed Critical Guangdong Welling Motor Manufacturing Co Ltd
Priority to CN202123195609.3U priority Critical patent/CN216625523U/en
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Publication of CN216625523U publication Critical patent/CN216625523U/en
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Abstract

The utility model discloses a motor and an electric bicycle, wherein the motor comprises a rotor, a magnetic ring and a magnetic angle sensor, the rotor is provided with a rotating shaft, the magnetic ring is sleeved on the rotating shaft, and magnetic poles of the magnetic ring are distributed along the circumferential direction; the position of the magnetic angle sensor is fixed and is arranged at intervals with the magnetic ring; the number of poles of the magnetic ring is the same as that of the rotor, the motor adopts the magnetic angle sensor to replace a Hall sensor, the magnetic angle sensor is fixedly installed, the magnetic ring can rotate along with the rotating shaft, the magnetic field change of the magnetic ring is detected through the magnetic angle sensor, the angle position data of the rotor can be obtained through detecting the angle position of the magnetic ring, conversion processing of the angle position of the magnetic ring and the angle position of the rotor is not needed, the detection accuracy is higher, the rotor position data can be fed back more accurately, improvement of control accuracy of the output rotating speed of the motor is facilitated, and the motor is suitable for a middle motor of an electric bicycle.

Description

Motor and electric bicycle
Technical Field
The utility model relates to the technical field of electric appliances, in particular to a motor and an electric bicycle.
Background
In the related art, the electric bicycle adopts the middle-mounted motor as a driving device, an angle sensor of the middle-mounted motor is usually a Hall sensor, the precision of the Hall sensor is not high, the position of a rotor cannot be accurately fed back to a controller, and the controller is limited to accurately control the output rotating speed of the motor.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the motor provided by the utility model can be beneficial to improving the accuracy of detecting the position of the rotor, so that the motor can be accurately controlled.
The utility model also provides an electric bicycle comprising the motor.
An electric machine according to an embodiment of the first aspect of the utility model comprises:
a rotor provided with a rotating shaft;
the magnetic ring is sleeved on the rotating shaft, and magnetic poles of the magnetic ring are distributed along the circumferential direction;
the magnetic angle sensor is fixed in position and is arranged at intervals with the magnetic ring;
the number of poles of the magnetic ring is the same as that of the rotor.
The motor provided by the embodiment of the utility model has at least the following beneficial effects:
the motor adopts magnetism angle sensor to replace hall sensor, magnetism angle sensor fixed mounting is on the control circuit board of motor, the magnetic ring can rotate along with the pivot, the magnetic field through magnetism angle sensor detection magnetic ring changes, and the number of poles of magnetic ring is the same with the number of poles of rotor, the synchronous revolution number of rotor can be reflected to the number of poles of magnetic ring, the angular position through detecting the magnetic ring can obtain the angular position data of rotor, need not to convert the angular position of magnetic ring and the angular position of rotor and handle, detection accuracy is higher, can more accurate feedback rotor position data, be favorable to improving the control accuracy to motor output speed, be applicable to electric bicycle's middle motor.
According to some embodiments of the utility model, the number of poles of the magnetic ring is P, and P is more than or equal to 10 and less than or equal to 16.
According to some embodiments of the utility model, the magnetic angle sensor is arranged radially outside the magnetic ring.
According to some embodiments of the utility model, a plane in which the magnetic angle sensor and the magnetic ring are located is perpendicular to the rotation axis.
According to some embodiments of the utility model, a center line of the magnetic angle sensor coincides with a center line of the magnetic ring or has a maximum deviation of 0.5mm in a height direction of the motor.
According to some embodiments of the utility model, the magnetic ring is annular, and the rotating shaft is provided with a shaft sleeve for fixing the magnetic ring.
According to some embodiments of the utility model, the magnetic angle sensor is a magnetoresistive angle sensor.
According to some embodiments of the present invention, the magnetic angle sensor further comprises a control circuit board, the magnetic angle sensor is disposed on the control circuit board, and the control circuit board is fixedly connected to the housing of the motor.
According to some embodiments of the utility model, the motor further comprises a stator fixed in the housing of the motor, and the rotor is rotatably disposed in the stator.
The electric bicycle according to the second aspect embodiment of the present invention includes the motor according to the first aspect embodiment.
The electric bicycle provided by the embodiment of the utility model at least has the following beneficial effects:
the electric bicycle adopts all the technical solutions of the motor of the above embodiments, and therefore has at least all the advantages brought by the technical solutions of the above embodiments.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic cross-sectional view of a motor according to an embodiment of the present invention;
FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;
FIG. 3 is a schematic structural diagram of a rotating shaft and a control circuit board according to an embodiment of the present invention;
FIG. 4 is a side view of the hinge and the control circuit board according to an embodiment of the present invention;
FIG. 5 is a schematic top view of a rotating shaft and a control circuit board according to an embodiment of the present invention;
FIG. 6 is a cross-sectional view taken along line A-A of FIG. 5;
fig. 7 is a schematic view of the magnetic poles of the magnetic ring according to an embodiment of the present invention distributed along the circumferential direction.
Reference numerals:
a motor 100; a housing 110; a stator 120; a rotor 130; a rotating shaft 131; a sleeve 132; a control circuit board 140; a magnetic angle sensor 150; a magnetic ring 160.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms upper, lower, etc. indicate orientations or positional relationships based on those shown in the drawings only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, if there are first and second described only for the purpose of distinguishing technical features, it is not understood that relative importance is indicated or implied or that the number of indicated technical features or the precedence of the indicated technical features is implicitly indicated or implied.
In the description of the present invention, it should be noted that the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the terms in the present invention by combining the specific contents of the technical solutions.
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the embodiments described below are some, but not all embodiments of the present invention.
The motor 100 according to the embodiment of the present invention is described with reference to fig. 1 to 7, the motor 100 is applied to an electric bicycle, and particularly, to a center motor of an electric bicycle, and the motor 100 is described below as a specific example.
Referring to fig. 1, an embodiment of the present invention provides a motor 100 including a housing 110, a stator 120 and a rotor 130 are installed in the housing 110, wherein the stator 120 is fixed inside the housing 110, the rotor 130 is rotatably disposed in the stator 120, the rotor 130 includes a rotor core and a rotating shaft 131 connected to the rotor core, a plurality of permanent magnets are circumferentially disposed on the rotor core, a winding is disposed on the stator 120, when the winding is energized, a magnetic field can be generated, so as to drive the rotor 130 to rotate, and the rotor 130 is supported by a bearing in the housing 110, so that the rotor 130 can stably operate in the housing 110.
It can be understood that the output rotation speed of the motor 100 is controlled by the controller during the operation of the motor 100, so as to realize the electric speed regulation of the electric bicycle. Specifically, in the embodiment, the motor 100 detects the angular position of the rotor 130 through the sensor, and feeds back the angular position data of the rotor 130 to the controller, and the controller can control the output rotation speed of the motor 100 according to the angular position data of the rotor 130, wherein the sensor is the magnetic angle sensor 150, the magnetic ring 160 corresponding to the magnetic angle sensor 150 is arranged on the rotating shaft 131, and the magnetic angle sensor 150 and the magnetic ring 160 are matched to detect the rotation angle of the rotor 130, so as to obtain the angular position data of the rotor 130.
Referring to fig. 1 and 2, the magnetic ring 160 is sleeved on the rotating shaft 131, the magnetic angle sensor 150 is fixedly installed on the control circuit board 140 of the controller, the control circuit board 140 is fixedly installed on the motor 100, so that the position of the magnetic angle sensor 150 is fixed, and the magnetic ring 160 rotates along with the rotating shaft 131. It can be understood that, as the rotor 130 rotates, the magnetic pole position of the magnetic ring 160 changes, so that the magnetic field direction also changes, and the magnetic angle sensor 150 can detect the angular position of the magnetic ring 160 according to the change of the magnetic field, so as to acquire the angular position data of the rotor 130 and feed the data back to the controller.
Referring to fig. 3, fig. 3 is a schematic view illustrating an assembly of the rotating shaft 131 and the control circuit board 140. In an embodiment, the magnetic angle sensor 150 is packaged on an integrated chip, and the chip is fixed on the control circuit board 140, so that the chip size is small, and the size of the motor 100 is reduced. The magnetic ring 160 is fixed on the rotating shaft 131, the chips are arranged close to the magnetic ring 160 at intervals, and the chips do not need to be in contact with the magnetic ring 160. That is, the magnetic angle sensor 150 can detect a change in the direction of the magnetic field of the magnetic ring 160 in a non-contact manner to obtain the angular position of the rotor 130, and the magnetic angle sensor 150 may also be understood as a non-contact type magnetic angle sensor 150.
It can be understood that, when the non-contact magnetic angle sensor 150 is used for measurement, the mechanical friction can be greatly reduced, the rotor 130 and the controller are insulated from each other, the mechanical tolerance and other problems have less influence on the measurement, the operation reliability is high, and the installation is flexible and convenient.
Referring to fig. 7, fig. 7 is a schematic diagram illustrating that the magnetic poles of the magnetic ring 160 are distributed along the circumferential direction, the magnetic ring 160 has a plurality of magnetic poles, and the number of the magnetic poles of the magnetic ring 160 is the same as the number of the magnetic poles of the rotor 130, wherein the number of the magnetic poles is understood as the number of the magnetic poles, the magnetic poles are divided into N poles and S poles, and the number of the magnetic poles is usually paired. For example, when the number of poles of the rotor 130 is 8, it means that the rotor 130 has 8 magnetic poles, and 4 pairs of magnetic poles are also understood. Since the number of poles can reflect the synchronous rotational speed of the motor 100, the magnetic angle sensor 150 can detect the angular position of the magnetic ring 160 according to the change of the magnetic field direction of the magnetic ring 160 on the rotating shaft 131 by setting the number of poles of the magnetic ring 160 to be identical to the number of poles of the rotor 130, and the relational expression n between the rotational speed of the rotating magnetic field and the number of poles is 60f/p, where n is the rotational speed of the rotating magnetic field, f is the power frequency, and p is the number of poles. It can be known that, under the condition that the power frequency f is not changed, the number of poles of the rotor 130 can be used to obtain the rotation speed of the rotating magnetic field, and the corresponding angular position can be obtained according to the rotation speed, and when the number of poles of the magnetic ring 160 is the same as the number of poles of the rotor 130, the angular position of the rotor 130 can be obtained by the magnetic angle sensor 150 detecting the angular position of the magnetic ring 160.
It can be understood that, when the number of poles of the magnetic ring 160 is different from the number of poles of the rotor 130, after the rotational speed of the rotating magnetic field of the magnetic ring 160 is detected, conversion needs to be performed according to the proportional relationship between the number of poles of the magnetic ring 160 and the number of poles of the rotor 130, and the rotational speed of the rotating magnetic field of the rotor 130 can only be obtained after the conversion, that is, the detected angular position of the magnetic ring 160 cannot be directly expressed as the angular position of the rotor 130, and corresponding conversion processing needs to be performed. The magnetic angle sensor 150 and the magnetic ring 160 of the embodiment cooperate with the detected angle position data, the conversion processing of the angle position of the magnetic ring 160 and the angle position of the rotor 130 is not needed, the detection accuracy is higher, the position data of the rotor 130 can be fed back to the controller more accurately, the improvement of the control accuracy of the controller on the output rotating speed of the motor 100 is facilitated, and the magnetic angle sensor is more practical and reliable.
In some embodiments, referring to fig. 7, the number P of poles of the magnetic ring 160 is 14, that is, the magnetic ring 160 has 7 pairs of magnetic poles, the magnetic poles are uniformly distributed along the circumferential direction of the magnetic ring 160, the number of poles of the rotor 130 is also 14, and when the number of poles of the magnetic ring 160 is the same as the number of poles of the rotor 130 and is 14, the design is more reasonable, the detection accuracy is higher, and the control accuracy of the controller on the output rotation speed of the motor 100 is further improved. Specifically, the number of poles of the magnetic ring 160 can be set according to the requirements of the actual application scene, and the range of the number of poles of the magnetic ring 160 can satisfy that P is more than or equal to 10 and less than or equal to 16, so as to satisfy the requirement of detection accuracy.
It should be noted that, the hall sensor is adopted to detect the angular position of the rotor 130 in the traditional mid-motor, the hall sensor is composed of a magnetic drum and a hall element, the hall sensor needs to be installed perpendicular to the magnetic field direction, and the occupied internal space of the mid-motor is large. The magnetic angle sensor 150 adopted in the embodiment of the utility model is specifically a magnetic resistance type angle sensor, compared with a Hall sensor, the magnetic resistance type angle sensor has higher detection accuracy and more flexible installation, can operate in a wide temperature range, has detection accuracy which is not influenced by mechanism errors and deflection of a magnetic field caused by temperature or service time, and is stable and reliable in operation.
Referring to fig. 3 and 4, the chip is located on the radial outer side of the magnetic ring 160, that is, in the radial direction of the rotating shaft 131, the magnetic angle sensor 150 corresponds to the magnetic ring 160, and the magnetic angle sensor 150 is close to the outer side surface of the magnetic ring 160, which is beneficial to reducing the space occupied by the magnetic angle sensor 150 in the axial direction and reducing the axial size of the motor 100.
Referring to fig. 4, fig. 4 is a side view of the rotating shaft 131 and the control circuit board 140, wherein the control circuit board 140 is parallel to the horizontal direction, the chip is located on the upper surface of the control circuit board 140, the height of the magnetic ring 160 is greater than the height of the chip, and the chip can be disposed at the center of the magnetic ring 160 along the height direction. It can be understood that the magnetic angle sensor 150 and the magnetic ring 160 are both arranged along the horizontal direction, the upper surface of the control circuit board 140 is used as a reference surface, the chip and the magnetic ring 160 are both located at the reference surface, and the reference surface is perpendicular to the axial direction of the rotating shaft 131, so that the design is more reasonable, the magnetic angle sensor 150 can accurately detect the change of the magnetic field, and the accuracy is higher.
Referring to fig. 1 and 2, a control circuit board 140 is installed in the motor 100 and fixedly connected to the housing 110, and the embodiment shown in fig. 1 is taken as an example to illustrate that the control circuit board 140 is located above the rotor core and the stator 120, and the magnetic angle sensor 150 is located on the upper surface of the control circuit board 140.
It can be understood that, in the height direction of the motor 100, the magnetic angle sensor 150 and the magnetic ring 160 both have a central point, and a line passing through the central point along the radial direction of the rotating shaft 131 is a central line, that is, the magnetic angle sensor 150 and the magnetic ring 160 both have a central line, in the embodiment, the central line of the magnetic angle sensor 150 and the central line of the magnetic ring 160 may be coincident, and the line B-B in fig. 6 is a coincident central line, so that the magnetic angle sensor 150 and the magnetic ring 160 form a centering installation structure, the structural design is more reasonable, and the magnetic angle sensor 150 can accurately detect the magnetic field variation of the magnetic ring 160, thereby achieving more accurate measurement.
In some embodiments, the centerline of magnetic angle sensor 150 and the centerline of magnetic ring 160 may have a certain deviation in the height direction, i.e., the centerline of magnetic angle sensor 150 and the centerline of magnetic ring 160 do not coincide, and in an embodiment, the maximum deviation is 0.5mm, for example, the centerline of magnetic ring 160 may be above or below the centerline of magnetic angle sensor 150 in the height direction of electric machine 100, with the centerline of magnetic angle sensor 150 being taken as a reference line, and the maximum distance between the two centerlines is 0.5 mm. It is appreciated that the deviation may be in the range of 0.5mm, for example, the deviation of the centerline of the magnetic angle sensor 150 from the centerline of the magnetic loop 160 may be 0.1mm, 0.2mm, etc.
Referring to fig. 5 and 6, fig. 5 is a top view of the rotating shaft 131 and the control circuit board 140, fig. 6 is a cross-sectional view of the rotating shaft 131 and the control circuit board 140, a shaft sleeve 132 is sleeved on the rotating shaft 131, and the magnetic ring 160 is annular and sleeved on the shaft sleeve 132, so that the magnetic ring 160 can be fixed on the rotating shaft 131. The shaft sleeve 132 and the rotating shaft 131 can be connected in a manner of interference fit, bonding, and the like, and the magnetic ring 160 can be bonded or clamped on the shaft sleeve 132, so that the magnetic ring 160 and the rotating shaft 131 can synchronously rotate, and the structure is stable and reliable.
The electric bicycle (not shown in the drawings) provided by the embodiment of the present invention adopts the motor 100 of the above embodiment as a middle motor, and compared with the conventional method that the middle motor adopts a hall sensor to detect the position of the rotor 130, the embodiment adopts a reluctance type angle sensor to replace the hall sensor, which has higher detection precision, the reluctance type angle sensor cooperates with the magnetic ring 160 to detect the angle position data, under the condition that the number of poles of the magnetic ring 160 is the same as that of the rotor 130, the reluctance type angle sensor detects the angular position of the magnetic ring 160 to obtain the angular position of the rotor 130, conversion processing of the angular position of the magnetic ring 160 and the angular position of the rotor 130 is not needed, position data of the rotor 130 can be fed back to the controller more accurately, control accuracy of the controller on the output rotating speed of the motor 100 can be improved, and therefore the electric bicycle can be driven to run more accurately.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims (10)

1. An electric machine, comprising:
a rotor provided with a rotating shaft;
the magnetic ring is sleeved on the rotating shaft, and magnetic poles of the magnetic ring are distributed along the circumferential direction;
the magnetic angle sensor is fixed in position and is arranged at intervals with the magnetic ring;
the number of poles of the magnetic ring is the same as that of the rotor.
2. The motor as claimed in claim 1, wherein the number of poles of the magnetic ring is P, and P is 10-16.
3. The electric machine of claim 1, wherein the magnetic angle sensor is disposed radially outward of the magnetic ring.
4. The electric machine of claim 1, wherein a plane in which the magnetic angle sensor and the magnetic ring are located is perpendicular to the rotating shaft.
5. An electric machine as claimed in claim 4, characterized in that, in the height direction of the electric machine, the center line of the magnetic angle sensor coincides with the center line of the magnetic ring or has a maximum deviation of 0.5 mm.
6. The motor as claimed in claim 1, wherein the magnetic ring is annular, and the rotation shaft is provided with a bushing for fixing the magnetic ring.
7. The machine according to claim 1, characterized in that said magnetic angle sensor is a magnetoresistive angle sensor.
8. The motor of claim 1, further comprising a control circuit board, wherein the magnetic angle sensor is disposed on the control circuit board, and the control circuit board is fixedly connected to a housing of the motor.
9. The electric motor of claim 1, further comprising a stator, wherein the stator is secured within a housing of the electric motor, and wherein the rotor is rotatably disposed within the stator.
10. An electric bicycle comprising a built-in motor according to any one of claims 1 to 9.
CN202123195609.3U 2021-12-16 2021-12-16 Motor and electric bicycle Active CN216625523U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202123195609.3U CN216625523U (en) 2021-12-16 2021-12-16 Motor and electric bicycle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202123195609.3U CN216625523U (en) 2021-12-16 2021-12-16 Motor and electric bicycle

Publications (1)

Publication Number Publication Date
CN216625523U true CN216625523U (en) 2022-05-27

Family

ID=81705161

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202123195609.3U Active CN216625523U (en) 2021-12-16 2021-12-16 Motor and electric bicycle

Country Status (1)

Country Link
CN (1) CN216625523U (en)

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