External rotor motor with encoder

Abstract

The utility model discloses an external rotor motor with an encoder, which comprises a motor stator, an external rotor cover and a circuit board, the motor stator is fixedly connected with a circuit board, and an encoder sensing chip and an encoder wiring terminal are fixedly mounted on the circuit board; the motor stator is located in the outer rotor cover, the inner side of the outer rotor cover is fixedly connected with a magnetic ring, the magnetic ring is arranged around the motor stator, and the magnetic ring comprises multiple pairs of magnetic poles; the outer rotor cover can rotate relative to the motor stator. According to the outer rotor motor, rotation of the magnetic ring on the inner side of the outer rotor cover is sensed through the encoder sensing chip, and related electric signals are output through the encoder wiring terminal to obtain the rotating speed of the motor. According to the external rotor motor, related parts of the encoder are all integrated in the external rotor motor, and the magnetic ring on the external rotor cover is used for acquiring rotating speed data, so that compared with a traditional mode of installing the encoder on the output shaft of the motor, the space utilization rate and the integration degree are higher, and the number of transmission stages is smaller.

Description

Technical Field

[0001] The utility model relates to the field of driving parts, in particular to an outer rotor motor with an encoder. Background Art

[0002] Due to their compact design and space-saving advantages, external rotor motors are widely used in automotive, industrial control, automation, aerospace, and other fields. An encoder, a device that converts angular or linear displacement into an electrical signal, can be installed on an external rotor motor to obtain the motor's speed.

[0003] The existing technology is to install a corresponding encoder on the output shaft of the outer rotor motor. For example, the Chinese patent named "A non-hollow encoder installation structure for an outer rotor brushless motor" and application number 20202038178X discloses installing a non-hollow encoder on the output shaft of the outer rotor brushless motor. This external method occupies a large volume, and the encoder also needs other transmission structures to be connected to the motor to measure and feedback the motor. There are many transmission levels and the transmission efficiency is low. Utility Model Content

[0004] The purpose of the utility model is to provide an outer rotor motor with an encoder to solve the problems caused by the external placement of the existing encoder.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] An outer rotor motor with an encoder comprises a motor stator, an outer rotor cover and a circuit board;

[0007] The motor stator is fixedly connected to the circuit board, and the circuit board is fixedly mounted with an encoder sensor chip and encoder connection terminals;

[0008] The motor stator is located inside the outer rotor cover. A magnetic ring is fixedly connected to the inner side of the outer rotor cover. The magnetic ring is arranged around the motor stator and includes multiple pairs of magnetic poles. The outer rotor cover can rotate relative to the motor stator.

[0009] Optionally, the outer rotor motor includes a motor sleeve, and the circuit board and the motor stator are fixedly mounted on the motor sleeve; a motor output shaft is fixedly connected to the outer rotor cover, and the motor sleeve is rotatably mounted on the motor output shaft, and one end of the motor output shaft away from the outer rotor cover extends out from the motor sleeve.

[0010] Optionally, the motor sleeve includes a sleeve body and a sleeve fixing member, wherein the sleeve fixing member is arranged around the outer cylindrical surface of the sleeve body and fixedly connected to an end of the sleeve body away from the outer rotor cover;

[0011] A through hole is provided in the center of the circuit board, the sleeve body passes through the through hole so that the circuit board is sleeved on the sleeve body, the sleeve fixing member and the circuit board are fixedly connected by bolts; the circuit board is located between the sleeve fixing member and the motor stator;

[0012] A stator through hole is provided at the center of the motor stator, and the sleeve body passes through the stator through hole so that the motor stator is sleeved on the sleeve body; the stator through hole and the sleeve body are interference connected, and friction lines are provided on the inner wall of the stator through hole.

[0013] Optionally, a plurality of bearings are fixedly connected to the inner side of the sleeve body, and the motor output shaft is fixedly connected to the bearings.

[0014] Optionally, the bearing and the sleeve body are fixedly connected by a retaining spring, and the motor output shaft passes through the inner ring of the bearing and is interference-connected therewith; one bearing is fixedly connected to each of the two ends of the sleeve body.

[0015] Optionally, the sleeve fixing member and the circuit board are located outside the outer rotor cover, and the encoder terminal is fixed to a side of the circuit board facing away from the outer rotor; the outer rotor cover includes a bottom cover and an annular side cover fixedly connected to the bottom cover, and the motor output shaft is fixedly connected to the center of a side of the bottom cover facing the motor stator;

[0016] The magnetic ring is glued to the inner wall surface of the annular side cover, and multiple pairs of magnetic poles are distributed around the motor output shaft at equal intervals and are arranged toward the circuit board. Each pair of magnetic poles includes an N pole and an S pole.

[0017] Optionally, it is characterized in that the encoder sensor chip is fixed on the side of the circuit board facing the outer rotor cover; the encoder sensor chip includes two Hall sensor chips, and the angle between the two Hall sensor chips = (360 / number of magnetic poles) / 2+K*360 / number of magnetic poles, where 0≤K≤number of magnetic poles-1.

[0018] Optionally, the circuit board is circular, and one end of each Hall sensor chip points to the center of the circuit board; and a preset distance is spaced between two Hall sensor chips.

[0019] Optionally, the Hall sensor chip includes a Hall chip body and several Hall chip pins fixedly connected to the Hall chip body, and the Hall chip pins are fixedly connected to the circuit board; the acute angle formed by the intersection of the center lines of the two Hall sensor chips is the angle between the two Hall sensor chips, and the intersection is the center of the circuit board; the Hall chip body is rectangular and the center line of the Hall chip is the long midline of the rectangle.

[0020] Optionally, the encoder terminal block is provided with a plurality of motor power supply input pins, a plurality of motor control signal input pins and two encoder signal output pins, and the two Hall sensor chips and the two encoder signal output pins are electrically connected in a one-to-one correspondence;

[0021] A pull-up resistor is also electrically connected between the electrically connected Hall sensor chip and the encoder output pin, and the pull-up resistor is fixed on the encoder output pin.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] This outer rotor motor with an encoder uses an encoder sensor chip to sense the rotation of a magnetic ring on the inner side of the outer rotor cover, and outputs a corresponding electrical signal through the encoder terminals to obtain the motor's speed. This outer rotor motor integrates all encoder-related components within the motor and uses the magnetic ring on the outer rotor cover to obtain speed data. Compared to the traditional method of mounting an encoder on the motor output shaft, this method offers greater space utilization and integration, while requiring fewer transmission stages. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] The structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in this specification so as to facilitate understanding and reading by those familiar with this technology. They are not intended to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modifications, changes in proportional relationships, or adjustments in size, without affecting the efficacy and objectives that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed in the present invention.

[0026] Figure 1 An exploded schematic diagram of an outer rotor motor with an encoder provided in an embodiment of the present utility model;

[0027] Figure 2 A schematic diagram of the overall structure of an outer rotor motor with an encoder provided in an embodiment of the present utility model;

[0028] Figure 3 A schematic structural diagram of a circuit board of an outer rotor motor with an encoder provided in an embodiment of the present utility model;

[0029] Figure 4 Another structural schematic diagram of a circuit board of an outer rotor motor with an encoder provided by an embodiment of the present utility model;

[0030] Figure 5 This is a schematic structural diagram of the outer rotor cover of an outer rotor motor with an encoder provided in an embodiment of the present utility model.

[0031] Illustration: 1. Motor stator; 2. Outer rotor cover; 3. Circuit board; 4. Hall sensor chip; 5. Encoder terminal; 6. Motor sleeve; 61. Sleeve body; 62. Sleeve fixing piece; 7. Motor output shaft; 8. Bearing; 9. Magnetic ring; 91. N pole; 92. S pole. DETAILED DESCRIPTION

[0032] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention. It should be noted that when a component is considered to be "connected / disposed on" another component, it may be connected / disposed on the other component, or there may be a centrally disposed component.

[0034] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0035] Please refer to Figure 1-3 The present invention provides an outer rotor motor with an encoder, comprising a motor stator 1, an outer rotor cover 2, and a circuit board 3. The motor stator 1 is fixedly connected to the circuit board 3, on which an encoder sensor chip and encoder terminals 5 are fixedly mounted. The motor stator 1 is located within the outer rotor cover 2. A magnetic ring 9 is fixedly connected to the inner side of the outer rotor cover 2. The magnetic ring 9 surrounds the motor stator 1 and includes multiple pairs of magnetic poles. The outer rotor cover 2 is rotatable relative to the motor stator 1.

[0036] This outer rotor motor with an encoder uses an encoder sensor chip to sense the rotation of the magnetic ring 9 on the inner side of the outer rotor cover 2, and outputs a related electrical signal through the encoder terminal 5 to obtain the motor's speed. This outer rotor motor integrates all encoder-related components within the motor and uses the magnetic ring 9 on the outer rotor cover 2 to obtain speed data. Compared to the traditional method of mounting encoder-related components such as the magnetic ring on the protruding portion of the motor output shaft 7, this method improves space utilization and integration, reduces the number of transmission stages, and reduces transmission errors.

[0037] In this embodiment, the outer rotor motor includes a motor sleeve 6, on which the circuit board 3 and the motor stator 1 are fixedly mounted. A motor output shaft 7 is fixedly connected to the outer rotor cover 2. The motor sleeve 6 is rotatably mounted on the motor output shaft 7, and the end of the motor output shaft 7 away from the outer rotor cover 2 extends out from the motor sleeve 6.

[0038] Specifically, the motor sleeve 6 includes a sleeve body 61 and a sleeve fixing member 62 . The sleeve fixing member 62 is arranged around the outer cylinder surface of the sleeve body 61 and fixedly connected to an end of the sleeve body 61 away from the outer rotor cover 2 .

[0039] The circuit board 3 has a through hole in its center, through which the sleeve body 61 passes to allow the circuit board 3 to be sleeved on the sleeve body 61. The sleeve fixing member 62 and the circuit board 3 are fixedly connected by bolts. The circuit board 3 is located between the sleeve fixing member 62 and the motor stator 1.

[0040] The motor stator 1 has a central through-hole, through which the sleeve body 61 passes, allowing the motor stator 1 to be sleeved onto the sleeve body 61. The stator through-hole and the sleeve body 61 are fitted with an interference fit, and the inner wall of the stator through-hole is provided with friction lines. The friction lines increase the friction between the stator through-hole and the sleeve body 61, making the connection between the sleeve body 61 and the stator through-hole more secure.

[0041] Several bearings 8 are fixedly connected in the sleeve body 61, and the motor output shaft 7 is fixedly connected to the bearings 8. The bearings 8 and the sleeve body 61 are fixedly connected by a retaining spring, and the motor output shaft 7 passes through the inner ring of the bearing 8 and is interference-connected therewith.

[0042] In this embodiment, a bearing 8 is fixedly connected to both ends of the sleeve body 61. The two bearings 8 can reduce the shaking of the motor output shaft 7 when it rotates relative to the sleeve body 61, making the rotation more stable.

[0043] In this embodiment, the sleeve fixing member 62 and the circuit board 3 are located outside the outer rotor cover 2. The encoder terminal blocks 5 are fixed to the side of the circuit board 3 facing away from the outer rotor. That is, the encoder terminal blocks 5 are located outside the outer rotor cover 2. This arrangement protects the wiring from being affected by the outer rotor cover 2. Specifically, the outer rotor cover 2 includes a bottom cover and an annular side cover fixedly connected to the bottom cover. The motor output shaft 7 is fixedly connected to the center of the bottom cover on the side facing the motor stator 1.

[0044] Please refer to Figure 4-5 Magnetic ring 9 is glued to the inner wall of the annular side cover. Multiple pairs of magnetic poles are evenly spaced around the motor output shaft 7 and face the circuit board 3. Each pair of magnetic poles includes an N pole 91 and an S pole 92. Magnetic ring 9 can be sensed by the encoder sensor chip to obtain speed data and also cooperate with the motor stator 1 to drive the rotation of the outer rotor cover 2. This dual function of magnetic ring 9 saves component costs and improves the space utilization and integration of the outer rotor motor. Specifically, the magnetic ring includes five pairs of magnetic poles.

[0045] In this embodiment, the encoder sensor chip is fixed to the side of the circuit board 3 facing the outer rotor cover 2 to facilitate the rotation of the sensing magnetic ring 9. The encoder sensor chip includes two Hall effect sensor chips 4. The angle X between the two Hall effect sensor chips 4 is (360° / number of magnetic poles) / 2+K*360° / number of magnetic poles, where 0≤K≤number of magnetic poles-1. Each pair of magnetic poles includes an north pole 91 and an south pole 92, meaning the number of magnetic poles per pair is two.

[0046] The output signals of the two Hall sensor chips 4 are the encoder A-phase signal and the encoder B-phase signal, respectively. When the outer rotor cover 2 rotates, the north pole 91 on the outer rotor cover 2 passes the Hall sensor chip 4, which outputs a corresponding high-level signal. The south pole 92 on the outer rotor cover 2 passes the Hall sensor chip 4, which outputs a corresponding low-level signal. By obtaining the periods of the A-phase and B-phase signals, the actual speed and direction of the outer rotor motor can be calculated by reverse calculation. The angle between the two Hall sensor chips 4 creates a 1 / 4 cycle time difference between the encoder A-phase and encoder B-phase signals, facilitating detection and identification of the output signals.

[0047] Specifically, the circuit board 3 is circular, and one end of each Hall sensor chip 4 points to the center of the circuit board 3. The two Hall sensor chips 4 are spaced apart by a preset distance.

[0048] like Figure 4As shown, the Hall sensor chip 4 includes a Hall chip body and several Hall chip pins fixedly connected to the Hall chip body. The Hall chip pins are fixedly connected to the circuit board 3. The acute angle formed by the intersection of the centerlines of two Hall sensor chips 4 is the angle X between the two Hall sensor chips 4, and the intersection is the center of the circuit board 3. The Hall chip body is rectangular, and the centerline of the Hall chip is the long midline of the rectangle. This placement of the Hall chip 4 allows it to more accurately sense the magnetic ring on the outer rotor.

[0049] In this embodiment, the encoder terminal 5 is provided with several motor power supply input pins, several motor control signal input pins and two encoder signal output pins. The two Hall sensor chips 4 and the two encoder signal output pins are electrically connected one-to-one. A pull-up resistor is also electrically connected between the electrically connected Hall sensor chip 4 and the encoder signal output pin, and the pull-up resistor is specifically fixed on the output pin of the encoder.

[0050] The pull-up resistor stabilizes the signal level output by Hall sensor chip 4, making the encoder signal more reliable. Encoder terminal 5 simultaneously serves as the power input and control signal input for the outer rotor motor, as well as the encoder signal output, further improving the outer rotor motor's space utilization and integration.

[0051] The outer rotor motor with encoder provided in this embodiment has the following advantages:

[0052] 1. The encoder-related components are integrated into the outer rotor motor and the magnetic ring 9 on the outer rotor cover 2 is used to obtain the speed data, which has high space utilization and integration.

[0053] 2. By setting the positions of the two Hall sensor chips 4, the rotation of the magnetic ring 9 is more accurately sensed and the output signal of the Hall sensor chip 4 is easy to detect and identify, thereby making the motor speed data more accurate.

[0054] In this document, "several" and "at least one" refer to one or more, while "multiple" and "at least two" refer to two or more. "And / or" describes the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0055] The above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may be modified or some of the technical features thereof may be replaced by equivalents; and such modifications or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An outer rotor motor with an encoder, comprising a motor stator, characterized in that: Also included are the outer rotor cover and circuit board; The motor stator is fixedly connected to the circuit board, and the circuit board is fixedly mounted with an encoder sensor chip and encoder connection terminals; The motor stator is located inside the outer rotor cover. A magnetic ring is fixedly connected to the inner side of the outer rotor cover. The magnetic ring is arranged around the motor stator and includes multiple pairs of magnetic poles. The outer rotor cover can rotate relative to the motor stator.

2. The outer rotor motor with encoder according to claim 1, characterized in that: The outer rotor motor includes a motor sleeve, and the circuit board and the motor stator are fixedly sleeved on the motor sleeve; a motor output shaft is fixedly connected to the outer rotor cover, and the motor sleeve is rotatably sleeved on the motor output shaft, and the end of the motor output shaft away from the outer rotor cover extends out from the motor sleeve.

3. The outer rotor motor with encoder according to claim 2, characterized in that: The motor sleeve comprises a sleeve body and a sleeve fixing member, wherein the sleeve fixing member is arranged around the outer cylindrical surface of the sleeve body and is fixedly connected to an end of the sleeve body away from the outer rotor cover; A through hole is provided in the center of the circuit board, the sleeve body passes through the through hole so that the circuit board is sleeved on the sleeve body, the sleeve fixing member and the circuit board are fixedly connected by bolts; the circuit board is located between the sleeve fixing member and the motor stator; A stator through hole is provided at the center of the motor stator, and the sleeve body passes through the stator through hole so that the motor stator is sleeved on the sleeve body; the stator through hole and the sleeve body are interference connected, and friction lines are provided on the inner wall of the stator through hole.

4. The outer rotor motor with encoder according to claim 3, characterized in that: A plurality of bearings are fixedly connected inside the sleeve body, and the motor output shaft is fixedly connected to the bearings.

5. The outer rotor motor with encoder according to claim 4, characterized in that: The bearing and the sleeve body are fixedly connected by a retaining spring, and the motor output shaft passes through the inner ring of the bearing and is interference-connected therewith; one bearing is fixedly connected to each of the two ends of the sleeve body.

6. The outer rotor motor with encoder according to claim 3, characterized in that: The sleeve fixing member and the circuit board are located outside the outer rotor cover, and the encoder terminal is fixed to the side of the circuit board facing away from the outer rotor; the outer rotor cover includes a bottom cover and an annular side cover fixedly connected to the bottom cover, and the motor output shaft is fixedly connected to the center of the bottom cover facing the motor stator; The magnetic ring is glued to the inner wall surface of the annular side cover, and multiple pairs of magnetic poles are distributed around the motor output shaft at equal intervals and are arranged toward the circuit board. Each pair of magnetic poles includes an N pole and an S pole.

7. The outer rotor motor with encoder according to claim 1, characterized in that: The encoder sensor chip is fixed on the side of the circuit board facing the outer rotor cover; the encoder sensor chip includes two Hall sensor chips, and the angle between the two Hall sensor chips is (360 / number of magnetic poles) / 2+K*360 / number of magnetic poles, where 0≤K≤number of magnetic poles-1.

8. The outer rotor motor with encoder according to claim 7, characterized in that: The circuit board is circular, and one end of each Hall sensor chip points to the center of the circuit board; and a preset distance is spaced between two Hall sensor chips.

9. The outer rotor motor with encoder according to claim 8, characterized in that: The Hall sensor chip includes a Hall chip body and a plurality of Hall chip pins fixedly connected to the Hall chip body, and the Hall chip pins are fixedly connected to the circuit board; the acute angle formed by the intersection of the center lines of the two Hall sensor chips is the angle between the two Hall sensor chips, and the intersection is the center of the circuit board; the Hall chip body is rectangular and the center line of the Hall chip is the long midline of the rectangle.

10. The outer rotor motor with encoder according to claim 7, characterized in that: The encoder terminal block is provided with a plurality of motor power supply input pins, a plurality of motor control signal input pins and two encoder signal output pins, and the two Hall sensor chips are electrically connected to the two encoder signal output pins in a one-to-one correspondence; A pull-up resistor is also electrically connected between the electrically connected Hall sensor chip and the encoder output pin, and the pull-up resistor is fixed on the encoder output pin.

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