Closed-loop stepping motor

Abstract

According to the closed-loop stepping motor, a closed-loop driver is fixed to the motor, space is saved, the trouble of drag line connection is omitted, meanwhile, the driver has a closed-loop function, the motion feedback model of the motor can be received, and the motion of the motor is controlled more accurately. According to the technical scheme, the device specifically comprises a stepping motor, a closed-loop driver and a wiring terminal, the top of the closed-loop driver is fixedly connected with the stepping motor, and one side of the driver is provided with the wiring terminal; wherein the shape of the cross section of the driver is the same as that of the cross section of the stepping motor; a rotating shaft is arranged in the stepping motor, and the bottom of the rotating shaft is connected with the closed-loop driver. The closed-loop stepping motor can achieve the effects of saving space and avoiding tow line connection. And meanwhile, a closed-loop function is provided for driving, the motion feedback model of the motor can be received, and the motor motion can be controlled more accurately.

Description

Technical Field

[0001] The utility model relates to the field of machinery, in particular to a closed-loop stepper motor. Background Art

[0002] A stepper motor is an open-loop control element that converts an electrical pulse signal into an angular displacement or a linear displacement. Under non-overloading conditions, the speed and stop position of the motor only depend on the frequency and number of pulse signals, and are not affected by load changes. When the stepper driver receives a pulse signal, it drives the stepper motor to rotate a fixed angle in the set direction, called the "step angle". Its rotation runs step by step at a fixed angle. The angular displacement can be controlled by controlling the number of pulses to achieve the purpose of accurate positioning; at the same time, the speed and acceleration of the motor rotation can be controlled by controlling the pulse frequency to achieve the purpose of speed regulation.

[0003] Currently, on the market, the way to control the operation of the motor is to use a stepper motor plus an external driver. The external driver not only occupies space, but also needs to be connected to the motor by a trailing wire, which is very inconvenient and the control is inaccurate. Summary of the Utility Model

[0004] In view of the above problems, embodiments of the present utility model are proposed to provide a closed-loop stepper motor that overcomes the above problems or at least partially solves the above problems:

[0005] A closed-loop stepper motor includes a stepper motor, a closed-loop driver, and a terminal block;

[0006] The top of the closed-loop driver is fixedly connected to the stepper motor, and the terminal block is provided on one side of the driver; wherein, the cross-sectional shape of the driver is the same as the cross-sectional shape of the stepper motor;

[0007] A rotating shaft is provided inside the stepper motor, and the bottom of the rotating shaft is connected to the closed-loop driver.

[0008] Preferably, the stepper motor includes a housing and an iron core assembly;

[0009] The housing wraps the iron core assembly, and the rotating shaft is provided in the middle of the iron core assembly.

[0010] Preferably, the housing includes a front housing and a rear housing;

[0011] The front housing is arranged on the top of the iron core assembly, the rear housing is arranged on the bottom of the iron core assembly, and the bottom of the rear housing is connected to the closed-loop driver.

[0012] Preferably, the front housing includes a front end cover, an adjusting nut, and a front bearing;

[0013] The rotating shaft passes through the front bearing and the gap adjusting nut, the gap adjusting nut is arranged above the front bearing, and the front end cover wraps the front bearing and the gap adjusting nut.

[0014] Preferably, the rear housing includes a rear end cover and a rear bearing;

[0015] The rotating shaft passes through the rear bearing, the rear end cover wraps the rear bearing, and the closed-loop driver is arranged at the bottom of the rear end cover.

[0016] Preferably, the iron core assembly includes a rotor iron core and a stator iron core; the rotating shaft is connected to the rotor iron core, and the stator iron core wraps the rotor iron core; wherein, the rotor iron core includes at least two groups.

[0017] Preferably, a magnetic isolation sheet is arranged between the rotor iron cores.

[0018] Preferably, the rotor iron core includes a first rotor group and a second rotor group;

[0019] The first rotor group and the second rotor group are connected by the magnetic isolation sheet.

[0020] Preferably, internal teeth are arranged on the inner side of the stator iron core, and external teeth are arranged on the outer side of the rotor iron core; the internal teeth and the external teeth are adapted to each other.

[0021] The present application specifically includes the following advantages:

[0022] In the embodiment of the present application, compared with the prior art of "using a stepper motor plus an external driver to control the operation of the motor, the external driver not only occupies space, but also needs to be connected to the motor by a trailing wire, which is very inconvenient and the control is inaccurate", the present application provides a solution of "fixing the closed-loop driver on the motor, saving space and eliminating the trouble of trailing wire connection. At the same time, the driver also has a closed-loop function, can receive the motion feedback signal of the motor, and can control the motion of the motor more accurately.", specifically: including a stepper motor, a closed-loop driver and a wiring terminal; the top of the closed-loop driver is fixedly connected to the stepper motor, and the wiring terminal is arranged on one side of the driver; wherein, the cross-sectional shape of the driver is the same as the cross-sectional shape of the stepper motor; a rotating shaft is arranged inside the stepper motor, and the bottom of the rotating shaft is connected to the closed-loop driver. By using the closed-loop driver, the problems of "the prior art needs wiring and is inconvenient to use, and the control is inaccurate" are solved. The closed-loop stepper motor can save space and avoid trailing wire connection. At the same time, the driver also has a closed-loop function, can receive the motion feedback signal of the motor, and can control the motion of the motor more accurately. Description of the Drawings

[0023] To more clearly illustrate the technical solution of this application, the following will briefly introduce the attached drawings required for the description of this application. Obviously, the attached drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other attached drawings can also be obtained based on these attached drawings.

[0024] Figure 1 is a schematic cross-sectional structure diagram of a closed-loop stepper motor of the present utility model;

[0025] Figure 2 is a schematic structure diagram of a closed-loop stepper motor of the present utility model;

[0026] Figure 3 is a schematic structure diagram of the second rotor group of a closed-loop stepper motor of the present utility model;

[0027] Figure 4 is a schematic structure diagram of the stator core of a closed-loop stepper motor of the present utility model;

[0028] Figure 5 is a schematic structure diagram of the gap-adjusting nut of a closed-loop stepper motor of the present utility model;

[0029] Figure 6 is a schematic structure diagram of the stator core and the first rotor core of a closed-loop stepper motor of the present utility model;

[0030] 1. Closed-loop driver; 2. Wiring terminal; 3. Stepper motor; 31. Rotating shaft; 32. Rear bearing; 33. Rear end cover; 34. Stator core; 35. Second rotor group; 36. Magnetic isolation sheet; 37. First rotor group; 38. Front bearing; 39. Front end cover; 391. Gap-adjusting nut. Detailed implementation manners

[0031] To make the above-mentioned objects, features, and advantages of this application more obvious and understandable, the following further details this application in conjunction with the attached drawings and specific implementation manners. Obviously, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts belong to the scope of protection of this application.

[0032] The inventor found through analyzing the prior art that: A stepper motor is an open-loop control component that converts electrical pulse signals into angular displacement or linear displacement. Under non-overloaded conditions, the rotation speed and stopping position of the motor only depend on the frequency and number of pulse signals, and are not affected by load changes. When the stepper driver receives a pulse signal, it drives the stepper motor to rotate a fixed angle in the set direction, which is called the "step angle". Its rotation runs step by step at a fixed angle. The angular displacement can be controlled by controlling the number of pulses, so as to achieve the purpose of accurate positioning; at the same time, the rotation speed and acceleration of the motor can be controlled by controlling the pulse frequency, so as to achieve the purpose of speed regulation.

[0033] The stepper motor 3 is an induction motor. Its working principle is to use an electronic circuit to convert direct current into a multi-phase time-sharing power supply and multi-phase timing control current. Only by supplying this current to the stepper motor 3 can the stepper motor 3 work properly. The driver is a multi-phase timing controller that supplies power to the stepper motor 3 in a time-sharing manner.

[0034] Currently, on the market, the way to control the operation of the motor is to use a stepper motor 3 plus an external driver. The external driver not only occupies space, but also needs to be connected to the motor by a trailing wire, which is very inconvenient. The closed-loop stepper motor 3 all-in-one machine in this application adds a small driver to the rear end face of the motor and fixes it on the motor, saving space and eliminating the trouble of trailing wire connection. At the same time, the driver also has a closed-loop function and can receive the motion feedback signal of the motor to control the motion of the motor more precisely.

[0035] In the embodiment of this application, compared with the prior art of "using a stepper motor 3 plus an external driver to control the operation of the motor, the external driver not only occupies space, but also needs to be connected to the motor by a trailing wire, which is very inconvenient and the control is inaccurate", this application provides a solution of "fixing the closed-loop driver 1 on the motor, saving space and eliminating the trouble of trailing wire connection. At the same time, the driver also has a closed-loop function and can receive the motion feedback signal of the motor to control the motion of the motor more precisely.", specifically: including a stepper motor 3, a closed-loop driver 1 and a terminal block 2; the top of the closed-loop driver 1 is fixedly connected to the stepper motor 3, and the terminal block 2 is provided on one side of the driver; wherein, the cross-sectional shape of the driver is the same as the cross-sectional shape of the stepper motor 3; a rotating shaft 31 is provided inside the stepper motor 3, and the bottom of the rotating shaft 31 is connected to the closed-loop driver 1. By the closed-loop driver 1, the problems of "the prior art requires wiring and is inconvenient to use, and the control is inaccurate" are solved. The closed-loop stepper motor 3 can save space and avoid trailing wire connection. At the same time, the driver also has a closed-loop function and can receive the motion feedback signal of the motor to control the motion of the motor more precisely.

[0036] It should be noted that the main differences between the open-loop and closed-loop of the stepper motor 3 lie in the control method and the impact on system accuracy. The open-loop stepper motor 3 is like sending a regular letter in the past. A signal is sent to the motor, and the motor will execute actions according to a preset sequence without feedback. This control method is simple and low-cost, but the accuracy is relatively low. The closed-loop stepper motor 3 is equivalent to sending a registered letter, which requires a report from the recipient and feedback. In closed-loop control, the stepper motor 3 driver will feedback corresponding action measures and signals to the PLC, and the PLC will decide the next program processing. This control method has high accuracy.

[0037] Referring to Figure 1-6 , a schematic structural diagram of the closed-loop stepper motor 3 of the present utility model is shown, which may specifically include the following structure: including a stepper motor 3, a closed-loop driver 1, and a terminal block 2; the top of the closed-loop driver 1 is fixedly connected to the stepper motor 3, and the terminal block 2 is provided on one side of the driver; wherein, the cross-sectional shape of the driver is the same as the cross-sectional shape of the stepper motor 3; a rotating shaft 31 is provided inside the stepper motor 3, and the bottom of the rotating shaft 31 is connected to the closed-loop driver 1.

[0038] Next, a closed-loop stepper motor 3 in this exemplary embodiment will be further described.

[0039] In an embodiment of the present application, the top of the closed-loop driver 1 is fixedly connected to the stepper motor 3, and the terminal block 2 is provided on one side of the driver; wherein, the cross-sectional shape of the driver is the same as the cross-sectional shape of the stepper motor 3.

[0040] As an example, the closed-loop driver 1 is fixedly connected to the stepper motor 3, and there is no gap between the closed-loop driver 1 and the stepper motor 3, thereby saving space. The terminal block 2 is connected to the side of the closed-loop driver 1 for connecting to the outside. The center of the closed-loop driver 1 is connected to the rotating shaft 31. The shape of the closed-loop driver 1 is the same as that of the stepper motor 3, and the two are integrally arranged.

[0041] In an embodiment of the present application, the stepper motor 3 includes a housing and an iron core assembly; the housing wraps the iron core assembly, and the rotating shaft 31 is provided in the middle of the iron core assembly. The rotating shaft 31 penetrates through the housing and the iron core assembly.

[0042] In an embodiment of the present application, the front housing includes a front end cover 39, an adjusting nut 391, and a front bearing 38; the rotating shaft 31 passes through the front bearing 38 and the adjusting nut 391, the adjusting nut 391 is disposed above the front bearing 38, and the front end cover 39 encloses the front bearing 38 and the adjusting nut 391. The rear housing includes a rear end cover 33 and a rear bearing 32; the rotating shaft 31 passes through the rear bearing 32, the rear end cover 33 encloses the rear bearing 32, and the closed-loop driver 1 is disposed at the bottom of the rear end cover 33. The adjusting nut 391 is used to adjust the positional relationship to make the components fit better.

[0043] In a specific embodiment, the front end cover 39 and the rear end cover 33 are respectively disposed above and below the iron core assembly.

[0044] In an embodiment of the present application, the front housing includes a front end cover 39, an adjusting nut 391, and a front bearing 38;

[0045] The rotating shaft 31 passes through the front bearing 38 and the adjusting nut 391, the adjusting nut 391 is disposed above the front bearing 38, and the front end cover 39 encloses the front bearing 38 and the adjusting nut 391. The rear housing includes a rear end cover 33 and a rear bearing 32; the rotating shaft 31 passes through the rear bearing 32, the rear end cover 33 encloses the rear bearing 32, and the closed-loop driver 1 is disposed at the bottom of the rear end cover 33.

[0046] As an example, the front bearing 38 and the rear bearing 32 both have balls inside. A bearing is an important component in contemporary mechanical equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotational accuracy. A rolling bearing generally consists of an outer ring, an inner ring, rolling elements, and a cage. According to the shape of the rolling elements, rolling bearings are divided into two categories: ball bearings and roller bearings.

[0047] In an embodiment of the present application, the iron core assembly includes a rotor iron core and a stator iron core 34; the rotating shaft 31 is connected to the rotor iron core, and the stator iron core 34 encloses the rotor iron core; wherein, the rotor iron core includes at least two groups. A magnetic isolation sheet 36 is provided between the rotor iron cores. The rotor iron core includes a first rotor group 37 and a second rotor group 35; the first rotor group 37 and the second rotor group 35 are connected by the magnetic isolation sheet 36.

[0048] In an embodiment of the present application, the inner side of the stator iron core 34 is provided with inner teeth, and the outer side of the rotor iron core is provided with outer teeth; the inner teeth and the outer teeth are adapted to each other. The innermost circle of the inner teeth is flush with the outermost circle of the outer teeth.

[0049] In a specific embodiment, the integrated closed-loop stepper motor 3 has a small driver added to the rear end face of the motor and is fixed to the motor, saving space and eliminating the trouble of drag-line connection. At the same time, the driver also has a closed-loop function and can receive the motion feedback signal of the motor to control the motor motion more precisely.

[0050] Although the preferred embodiments of the embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concepts. Therefore, the appended claims are intended to be construed to include the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present invention.

[0051] Finally, it should also be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or terminal device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or terminal device comprising the element.

[0052] The above provides a detailed introduction to a closed-loop stepper motor provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A closed-loop stepper motor, characterized in that: Including stepper motor, closed-loop driver and wiring terminals; The top of the closed-loop driver is fixedly connected to the stepper motor, and the wiring terminal is provided on one side of the driver; wherein the cross-sectional shape of the driver is the same as the cross-sectional shape of the stepper motor; A rotating shaft is arranged inside the stepping motor, and the bottom of the rotating shaft is connected to the closed-loop driver.

2. The closed-loop stepper motor according to claim 1, characterized in that: The stepper motor comprises a housing and an iron core assembly; The shell wraps the core assembly, and the rotating shaft is arranged in the middle of the core assembly.

3. The closed-loop stepper motor according to claim 2, characterized in that: The housing comprises a front housing and a rear housing; The front housing is arranged on the top of the core assembly, the rear housing is arranged on the bottom of the core assembly, and the bottom of the rear housing is connected to the closed-loop driver.

4. The closed-loop stepper motor according to claim 3, characterized in that: The front housing includes a front end cover, a clearance adjustment nut and a front bearing; The rotating shaft passes through the front bearing and the adjustment nut, the adjustment nut is arranged above the front bearing, and the front end cover wraps the front bearing and the adjustment nut.

5. The closed-loop stepper motor according to claim 3, characterized in that: The rear housing includes a rear end cover and a rear bearing; The rotating shaft passes through the rear bearing, the rear end cover wraps the rear bearing, and the closed-loop driver is arranged at the bottom of the rear end cover.

6. The closed-loop stepper motor according to claim 2, characterized in that: The core assembly includes a rotor core and a stator core; the rotating shaft is connected to the rotor core, and the stator core wraps the rotor core; wherein the rotor core includes at least two groups.

7. The closed-loop stepper motor according to claim 6, characterized in that: Magnetic isolation sheets are arranged between the rotor cores.

8. The closed-loop stepper motor according to claim 7, characterized in that: The rotor core includes a first rotor group and a second rotor group; The first rotor group and the second rotor group are connected via the magnetic isolation sheet.

9. The closed-loop stepper motor according to claim 6, characterized in that: The inner side of the stator core is provided with inner teeth, and the outer side of the rotor core is provided with outer teeth; the inner teeth are matched with the outer teeth.

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