Stepper Motor

Abstract

The utility model discloses a stepper motor, comprising: a motor assembly; a transmission gear assembly, which at least comprises a power output gear connected to the motor assembly; a circuit board, which is suitable for being electrically connected to the motor assembly; a motor control assembly, which comprises a first magnet and a second magnet arranged on the power output gear at intervals, and a sensor arranged on the circuit board for sensing the first magnet and the second magnet; the first magnet is located at the starting position when the power output gear is running, and the second magnet is located at the end position when the power output gear is running. The utility model can improve the flexibility of the overall stepper motor use process.

Description

Technical Field

[0001] The utility model relates to the field of intelligent equipment, in particular to a stepping motor. Background Art

[0002] When using a stepper motor, it is usually necessary to rely on a control system to achieve automatic control of its operating status (such as operating angle and operating direction).

[0003] In common control systems, an induction magnet is generally provided at the starting position of the output gear in the gear transmission assembly used in the stepper motor. For example, the patent with the announcement number CN207105947U discloses a reduction gearbox for a smart pen, wherein a magnet is provided in the reduction gear mechanism, and a Hall sensor is provided on the FPC circuit board. The Hall sensor is used to identify the position of the magnet when the reduction gear mechanism drives the magnet to rotate. The Hall sensor includes a first Hall switch and a second Hall switch, and the first Hall switch and the second Hall switch are arranged up and down; after the large gear rotates, the magnet can sense the first Hall switch and the second Hall switch respectively. Under this structure, a more complex control program is required when the stepper motor rotates. In the event of an emergency such as a power outage that causes the motor to be interrupted or abnormally operated, the position cannot be identified. If it stops in the stroke, an external program is required to control the motor to return to the zero position first to receive the signal difference before it can continue to work normally.

[0004] Therefore, in view of the problems existing in the use of the control system adopted by general stepper motors, from the perspective of optimizing its performance, its structure needs to be further optimized and improved. Utility Model Content

[0005] The utility model aims to provide a stepping motor to solve the technical problem of optimizing its performance.

[0006] The stepping motor of the utility model is realized as follows:

[0007] A stepping motor, comprising:

[0008] Motor components;

[0009] A transmission gear assembly, which at least includes a power output gear connected to the motor assembly;

[0010] A circuit board, which is suitable for being electrically connected to the motor assembly;

[0011] A motor control component includes a first magnet and a second magnet arranged at intervals on a power output gear, and a sensor arranged on a circuit board for sensing the first magnet and the second magnet; the first magnet is located at the starting position when the power output gear is running, and the second magnet is located at the end position when the power output gear is running.

[0012] In an optional implementation of the present invention, the sensor is a bipolar latch type magnetic sensor; and

[0013] The bipolar latch type magnetic sensor is adapted to detect N-pole magnetic properties when sensing the first magnet;

[0014] The bipolar latch type magnetic sensor is adapted to detect S-pole magnetic properties when sensing a second magnet.

[0015] In an optional implementation of the present invention, a positioning groove for assembling the first magnet and the second magnet is preset on the power output gear.

[0016] In an optional implementation of the present invention, the first magnet and the second magnet are both welded and fixed in the positioning groove.

[0017] In an optional implementation of the present invention, the first magnet and the second magnet are distributed along the circumferential direction on the power output gear, and the central angle formed between the first magnet and the second magnet is 90°.

[0018] In an optional implementation of the utility model, the stepper motor further comprises an outer housing for housing a motor assembly, a transmission gear assembly, a circuit board and a motor control assembly;

[0019] The outer shell comprises a shell body and a shell cover plate which are matched and connected.

[0020] In an optional implementation of the utility model, a positioning and mounting portion for supporting the power output gear is provided in the shell body; and

[0021] A limiting structure for limiting the rotation angle of the power output gear is also provided between the shell body and the power output gear.

[0022] In an optional implementation of the utility model, the limiting structure includes a core shaft arranged in the shell body, and an annular groove arranged on the power output gear and suitable for inserting the core shaft.

[0023] In an optional implementation of the present invention, the annular grooves are distributed along the circumferential direction on the power output gear, and the center angle of the annular grooves is 90°.

[0024] In an optional implementation of the present utility model, the power output gear is further connected with an output shaft; and

[0025] The shell cover plate is provided with a through hole suitable for the output shaft to pass through, and the circumferential side of the through hole is also provided with an angle scale mark.

[0026] By adopting the above technical solution, the utility model has the following beneficial effects: the stepper motor of the utility model cooperates with the sensor on the circuit board by means of the first magnet and the second magnet provided on the power output gear. As the power output gear runs, the sensor will sense the first magnet and the second magnet respectively, so that the signal difference can be sensed at the starting position and the end position of the power output gear. When encountering emergencies such as power failures that cause the motor to be interrupted or run abnormally, the position can also be identified. If it stops in the stroke, there is no need for an external program to control the motor to return to the starting position first to receive the signal difference before it can continue to work normally. Therefore, the utility model can improve the flexibility of the use process of the stepper motor through the coordinated cooperation of the above-mentioned multiple components, so that the patented technology of the utility model can be applied to the field of servo motor drive and control integrated systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the stepping motor of the utility model;

[0028] Figure 2 This is a schematic diagram of the exploded structure of the stepping motor of the utility model;

[0029] Figure 3 It is a schematic diagram of the internal structure of the shell body of the stepping motor of the utility model;

[0030] Figure 4 It is a structural schematic diagram of a shell cover plate of a stepping motor of the utility model;

[0031] Figure 5 It is a structural schematic diagram of the power output gear of the stepping motor of the utility model;

[0032] Figure 6 It is a schematic diagram of the structure of the first state of the power output gear of the stepping motor of the utility model during operation;

[0033] Figure 7 It is a schematic diagram of the second state structure of the power output gear of the stepping motor of the utility model during operation.

[0034] In the figure: shell body 1, core shaft 15, slot 16, positioning column 17, positioning mounting part 18, fixing plate 19, motor assembly 11, transmission gear assembly 12, power output gear 121, annular groove 122, connecting part 123, circuit board 13, shell cover 2, angle scale mark 21, through hole 22, first magnet 31, second magnet 32, sensor 4, output shaft 5, starting position A, end position B. DETAILED DESCRIPTION

[0035] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0036] See also Figures 1 to 7 As shown, this embodiment provides a stepper motor, including: an outer shell and a motor assembly 11, a transmission gear assembly 12, a circuit board 13 and a motor control assembly loaded in the outer shell. The outer shell includes a shell body 1 and a shell cover 2 which are connected to each other.

[0037] The motor assembly 11 is used to provide power. As for the specific structure and implementation principle of the motor assembly 11, any mature means in the prior art can be selected, and this embodiment does not make an absolute limitation on this. The circuit board 13 is electrically connected to the motor assembly 11, and a flexible circuit board 13 is preferably used here. A positioning column 17 is provided on the shell body 1, which is convenient for cooperating with the fixing plate 19 to position and fix the circuit board 13 to prevent the sensor 4 on the circuit board 13 from shifting and affecting the normal operation of the motor. The output port on the shell body 1 is provided with a card slot 16 that cooperates with the connecting line.

[0038] The transmission gear assembly 12 is used to transmit motion and torque, and at least includes a power output gear 121 connected to the motor assembly 11. Of course, it can be understood that the transmission gear assembly 12 here can also include a transition gear for connecting the power output gear 121 to the motor assembly 11. The specific number of transition gears is not absolutely limited in this embodiment. A positioning mounting portion 18 for supporting the power output gear 121 is provided in the shell body 1, and a connection portion 123 adapted to the positioning mounting portion 18 is preset on the corresponding power output gear 121.

[0039] On the basis of the above structure, in order to facilitate the circuit board 13 to accurately control the operating state of the motor assembly 11, such as the operating angle and direction, the motor control assembly is used to achieve:

[0040] In conjunction with the accompanying drawings, an optional motor control component is exemplified, including a first magnet 31 and a second magnet 32 ​​arranged at intervals on the power output gear 121, and a sensor 4 for sensing the first magnet 31 and the second magnet 32 ​​arranged on the circuit board 13. The first magnet 31 is located at the starting position A when the power output gear 121 is running, and the second magnet 32 ​​is located at the end position B when the power output gear 121 is running. Under this structure, the first magnet 31 and the second magnet 32 ​​are sensed by the sensor 4, and the corresponding signal is output, and the rotation position of the motor component 11 is identified by the signal.

[0041] Based on the above situation, in combination with a specific optional implementation, the first magnet 31 and the second magnet 32 ​​are distributed along the circumferential direction on the power output gear 121, and the central angle formed between the first magnet 31 and the second magnet 32 ​​is 90°.

[0042] Here, in an optional implementation, in order to improve the accuracy of the running direction and running track of the power output gear 121, a limiting structure for limiting the rotation angle of the power output gear 121 is further provided between the shell body 1 and the power output gear 121 in this embodiment. For the limiting structure, one example is given in conjunction with the accompanying drawings. The limiting structure includes a mandrel 15 provided in the shell body 1, and an annular groove 122 provided on the power output gear 121 for inserting the mandrel 15. And the annular groove 122 is distributed along the circumferential direction on the power output gear 121, and the center angle of the annular groove 122 is 90°. Of course, it is also possible to set the mandrel 15 on the power output gear 121 and design the annular groove 122 on the shell body 1. That is to say, as long as the power output gear 121 is assembled in place with the shell body 1, the annular groove 122 and the mandrel 15 are also assembled in place, so that it is convenient to limit the angle range of the power output gear 121 by the range of the center angle of the annular groove 122.

[0043] In more detail, in order to facilitate the reliable assembly of the first magnet 31 and the second magnet 32 ​​on the power output gear 121, a positioning groove for fixing the first magnet 31 and the second magnet 32 ​​is optionally provided on the power output gear 121. To this end, the first magnet 31 and the second magnet 32 ​​are fixed in the positioning groove of the power output gear 121 by, for example but not limited to, ultrasonic welding.

[0044] Based on the above situation, it should be noted that the sensor 4 in this embodiment is a bipolar latch type magnetic sensor 4; and when the bipolar latch type magnetic sensor 4 senses the first magnet 31, it is suitable for detecting the N-pole magnetic property; when the bipolar latch type magnetic sensor 4 senses the second magnet 32, it is suitable for detecting the S-pole magnetic property. Under this structure, magnets with opposite magnetic properties are provided at the starting position A and the end position B. When the bipolar latch type magnetic sensor 4 senses the first magnet 31, it is suitable for detecting the N-pole magnetic property and outputs a high level. When the bipolar latch type magnetic sensor 4 senses the second magnet 32, it is suitable for detecting the S-pole magnetic property and continuously outputs a low level. In this case, the corresponding external program can detect the specific position of the power output gear 121 in real time according to the signal fluctuations of the continuous output. The external program under this scheme can detect the specific position of the power output gear 121 in real time according to the signal fluctuations of the continuous output.

[0045] In addition, regarding the stepper motor of this embodiment, in order to be able to observe the operating state of the power output gear 121 under the action of the motor assembly 11, this embodiment also makes the following design:

[0046] The power output gear 121 is also connected to the output shaft 5 ; and the shell cover plate 2 is provided with a through hole 22 suitable for the output shaft 5 to pass through, and the circumferential side of the through hole 22 is also provided with an angle scale mark 21 .

[0047] In summary, for the stepper motor of this embodiment, the first magnet 31 and the second magnet 32 ​​provided on the power output gear 121 are used to cooperate with the sensor 4 on the circuit board 13. As the power output gear 121 runs, the sensor 4 will sense the first magnet 31 and the second magnet 32 ​​respectively, so that the signal difference can be sensed at the starting position and the end position of the power output gear 121. When encountering emergencies such as power failures that cause the motor to be interrupted or run abnormally, the position can also be identified. If it stops in the stroke, there is no need for an external program to control the motor to return to the starting position first to receive the signal difference before it can continue to work normally. Therefore, the utility model can improve the flexibility of the use process of the stepper motor through the coordinated cooperation of the above-mentioned multiple components.

[0048] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0049] In the description of the present invention, it is necessary to understand that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0052] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0053] In the present utility model, unless otherwise clearly specified and limited, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Claims

1. A stepping motor, characterized in that: include: Motor components; A transmission gear assembly, which at least includes a power output gear connected to the motor assembly; A circuit board, which is suitable for being electrically connected to the motor assembly; A motor control component includes a first magnet and a second magnet arranged at intervals on a power output gear, and a sensor arranged on a circuit board for sensing the first magnet and the second magnet; the first magnet is located at the starting position when the power output gear is running, and the second magnet is located at the end position when the power output gear is running.

2. The stepper motor according to claim 1, characterized in that: The sensor is a bipolar latch type magnetic sensor; and The bipolar latch type magnetic sensor is adapted to detect N-pole magnetic properties when sensing the first magnet; The bipolar latch type magnetic sensor is adapted to detect S-pole magnetic properties when sensing a second magnet.

3. The stepper motor according to claim 1 or 2, characterized in that: The power output gear is preset with a positioning groove for assembling the first magnet and the second magnet.

4. The stepper motor according to claim 3, characterized in that: The first magnet and the second magnet are both welded and fixed in the positioning groove.

5. The stepping motor according to claim 1 or 2, characterized in that: The first magnet and the second magnet are distributed along the circumferential direction on the power output gear, and the central angle formed between the first magnet and the second magnet is 90°.

6. The stepper motor according to claim 1, characterized in that: The stepper motor also includes an outer housing for housing a motor assembly, a transmission gear assembly, a circuit board and a motor control assembly; The outer shell comprises a shell body and a shell cover plate which are matched and connected.

7. The stepper motor according to claim 6, characterized in that: The housing body is provided with a positioning and mounting portion for supporting the power output gear; and A limiting structure for limiting the rotation angle of the power output gear is also provided between the shell body and the power output gear.

8. The stepper motor according to claim 7, characterized in that: The limiting structure comprises a core shaft arranged in the shell body, and an annular groove arranged on the power output gear and suitable for the core shaft to be inserted.

9. The stepper motor according to claim 8, characterized in that: The annular grooves are distributed along the circumferential direction on the power output gear, and the central angle of the annular grooves is 90°.

10. The stepper motor according to claim 6, characterized in that: The power output gear is also connected with an output shaft; and The shell cover plate is provided with a through hole suitable for the output shaft to pass through, and the circumferential side of the through hole is also provided with an angle scale mark.

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