Absorption circuit of stepping motor and motor device

Abstract

The utility model provides an absorption circuit of a stepping motor and a motor device, and relates to the technical field of motor safety. In the absorption circuit, a signal for conducting a controllable switch module is a signal output by a comparator under the condition that a first voltage is greater than a second voltage, the first voltage represents an actual value of a power supply end voltage of the stepping motor, and the second voltage represents a set threshold value of the power supply end voltage; and the controllable switch module is switched on under the condition that the actual value is greater than the set threshold value. As the controllable switch module and the absorption device are connected in series between the two poles of the power supply end of the stepping motor, part of electric energy of the power supply end of the stepping motor can be consumed and released in a heat energy manner when the actual value is greater than the set threshold value, namely, the voltage of the power supply end can be reduced; therefore, the absorption circuit can reduce the back electromotive force generated by the stepping motor.

Description

Technical Field

[0001] This utility model relates to the field of motor safety technology, and in particular to an absorption circuit and motor device for a stepper motor. Background Technology

[0002] Currently, in fully automated sample processing systems, if the stepper motors in the sample inlet / outlet module and centrifugation module brake or stop suddenly, the coils in the stepper motors will generate a large back electromotive force.

[0003] Measurements in actual working environments have shown that the back electromotive force generated by the coils in a stepper motor during braking and deceleration is higher than the threshold voltage, which may damage the control devices or even burn out the stepper motor.

[0004] Therefore, how to reduce the back electromotive force generated by the stepper motor is a technical problem that urgently needs to be solved. Utility Model Content

[0005] In view of this, the present invention provides an absorption circuit and motor device for a stepper motor to reduce the back electromotive force generated by the stepper motor.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] This application provides an absorption circuit for a stepper motor, comprising: a comparator, a controllable switching module, and an absorption device; wherein:

[0008] The first input terminal of the comparator receives a first voltage; the first voltage is a voltage that represents the actual value of the power supply terminal voltage of the stepper motor.

[0009] The second input terminal of the comparator receives a second voltage; the second voltage is a voltage representing a set threshold voltage of the power supply terminal.

[0010] The output of the comparator is connected to the control terminal of the controllable switch module.

[0011] The controllable switch module and the absorption device are connected in series between the two poles of the power supply terminal of the stepper motor;

[0012] The signal that turns on the controllable switch module is the signal output by the comparator when the first voltage is greater than the second voltage.

[0013] Optionally, it may also include: a step-down circuit; wherein:

[0014] The input terminal of the step-down circuit is connected to the positive terminal of the power supply terminal of the stepper motor, and the output terminal of the step-down circuit is connected to the first input terminal of the comparator.

[0015] Optionally, the step-down circuit includes: a first selection switch and at least two step-down branches; wherein:

[0016] The input and output terminals of the first selection switch correspond one-to-one; the first selection switch is a switch that can be manually controlled to determine whether its input terminal is connected to the corresponding output terminal.

[0017] The input terminal of the step-down branch is connected to the output terminal of the first selector switch in a one-to-one correspondence; the step-down branch corresponds to the voltage level of the stepper motor in a one-to-one correspondence.

[0018] The input terminals on the first selector switch that correspond one-to-one with the first target output terminals are connected to the positive terminal of the power supply terminal of the stepper motor; the first target output terminal is the output terminal on the first selector switch connected to the step-down branch;

[0019] The output of the step-down branch is connected to the first input of the comparator.

[0020] Optionally, it also includes: a voltage generation circuit; wherein:

[0021] The input terminal of the voltage generation circuit is connected to the positive terminal of the power supply terminal of the stepper motor, and the output terminal of the voltage generation circuit is connected to the second input terminal of the comparator.

[0022] Optionally, the voltage generation circuit includes: a second selection switch, a first clamping device, and at least two voltage divider branches; wherein:

[0023] The anode of the first clamping device is grounded, and the cathode of the first clamping device is connected to the second input terminal of the comparator.

[0024] Each of the voltage divider branches is connected in series, one end of the series branch is connected to the positive terminal of the power supply terminal of the stepper motor, and the other end of the series branch is connected to the cathode of the first clamping device.

[0025] The input and output terminals of the second selection switch correspond one-to-one; the second selection switch is a switch that can manually control whether its input terminal is connected to the corresponding output terminal;

[0026] The connection points of the two voltage divider branches are connected one-to-one with the output terminal of the second selector switch;

[0027] The input terminals on the second selector switch that correspond one-to-one with the second target output terminals are connected to the positive terminal of the power supply terminal of the stepper motor; the second target output terminal is the output terminal on the second selector switch connected to the voltage divider branch.

[0028] Optionally, the voltage generation circuit further includes: a first resistor and a second clamping device; wherein:

[0029] One end of the first resistor is connected to the connection point between the target voltage divider branch and the second selector switch; the target voltage divider branch is the voltage divider branch connected to the first clamping device;

[0030] The other end of the first resistor is connected to the cathode of the second clamping device, and the anode of the second clamping device is grounded.

[0031] Optionally, the output of the comparator is connected to one end of a pull-up resistor, and the other end of the pull-up resistor is connected to the cathode of the second clamping device.

[0032] Optionally, the absorption circuit of the stepper motor includes a step-down circuit, the step-down circuit including: a first selection switch;

[0033] The second selection switch and the first selection switch are integrated into a single selection switch.

[0034] Optionally, it may also include: a filter circuit, and / or an optocoupler, and / or a first prompting device, and / or a second prompting device; wherein:

[0035] One end of the filter circuit is connected to the positive terminal of the power supply of the stepper motor, and the controllable switch module is connected in series with the absorption device between the other end of the filter circuit and the negative terminal of the power supply of the stepper motor.

[0036] The input terminal of the primary side of the optocoupler is connected to the output terminal of the comparator, the output terminal of the primary side of the optocoupler is grounded, the input terminal of the secondary side of the optocoupler receives a third voltage, and the output terminal of the secondary side of the optocoupler is connected to the control terminal of the controllable switch module; the third voltage is a voltage that enables the controllable switch module to conduct.

[0037] The positive terminal of the first prompting device is connected to the positive terminal of the power supply terminal of the stepper motor, and the negative terminal of the first prompting device is connected to the negative terminal of the power supply terminal of the stepper motor.

[0038] The input terminal of the controllable switch module is connected to the positive terminal of the power supply terminal of the stepper motor through the absorption device, and the output terminal of the controllable switch module is connected to the negative terminal of the power supply terminal of the stepper motor. The positive terminal of the second prompting device receives a fourth voltage, and the negative terminal of the second prompting device is connected to the input terminal of the controllable switch module.

[0039] Another aspect of this application provides a motor device, including: a stepper motor and a snubber circuit for the stepper motor as described in any of the preceding aspects of this application.

[0040] As can be seen from the above technical solution, this utility model provides an absorption circuit for a stepper motor. In this absorption circuit, since the signal that turns on the controllable switch module is the signal output by the comparator when the first voltage is greater than the second voltage, the first voltage represents the actual value of the power supply terminal voltage of the stepper motor, and the second voltage represents the set threshold of the power supply terminal voltage, the controllable switch module turns on when the actual value is greater than the set threshold. Furthermore, since the controllable switch module and the absorption device are connected in series between the two poles of the stepper motor's power supply terminal, when the actual value is greater than the set threshold, part of the electrical energy of the stepper motor's power supply terminal can be consumed and released as heat, thus reducing the power supply terminal voltage. Therefore, this absorption circuit can reduce the back electromotive force generated by the stepper motor. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0042] Figures 1-6 These are schematic diagrams illustrating six different implementations of the absorption circuit for a stepper motor provided in this application. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0044] In this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0045] To reduce the back electromotive force generated by the stepper motor, embodiments of this application provide an absorption circuit for the stepper motor, the specific structure of which can be found in [reference needed]. Figure 1 ( Figure 1 (Taking only one example, where one end of the absorption device 30 is connected to the positive terminal of the power supply of the stepper motor and the output terminal of the controllable switch module 20 is connected to the negative terminal of the power supply of the stepper motor, the example includes: comparator 10, controllable switch module 20 and absorption device 30.)

[0046] The first input terminal of comparator 10 receives a first voltage V1. The first voltage V1 is a voltage that represents the actual value of the power supply terminal voltage of the stepper motor, that is, the first voltage V1 represents the aforementioned actual value. The aforementioned actual value refers to the actual voltage between the two poles of the power supply terminal of the stepper motor.

[0047] The second input terminal of comparator 10 receives a second voltage V2. The second voltage V2 is a voltage representing a set threshold voltage of the aforementioned power supply terminal voltage; that is, the second voltage V2 represents the aforementioned set threshold voltage. The aforementioned set threshold voltage refers to the set threshold voltage between the two poles of the stepper motor's power supply terminal.

[0048] It should be noted that the first voltage V1 and the second voltage V2 are both within the voltage range of comparator 10, so that comparator 10 can work normally, that is, so that comparator 10 can compare the first voltage V1 and the second voltage V2.

[0049] The output of comparator 10 is connected to the control terminal of controllable switch module 20. Normally, such as... Figure 1 As shown, the output of comparator 10 is connected to one end of pull-up resistor Rh, and the other end of pull-up resistor Rh receives the fifth voltage V5.

[0050] The controllable switch module 20 and the absorption device 30 are connected in series between the two poles of the power supply terminal of the stepper motor.

[0051] In a specific example, such as Figure 1 As shown, one end of the absorption device 30 is connected to the positive terminal of the power supply terminal of the stepper motor, the other end of the absorption device 30 is connected to the input terminal of the controllable switch module 20, and the output terminal of the controllable switch module 20 is connected to the negative terminal of the power supply terminal of the stepper motor.

[0052] Since the negative terminal of the power supply to the stepper motor is normally grounded (GND), the output terminal of the controllable switch module 20 is equivalent to grounded (GND). Figure 1 The output terminal of the controllable switch module 20 is grounded to GND for demonstration.

[0053] In another specific example, the input terminal of the controllable switch module 20 is connected to the positive terminal of the power supply terminal of the stepper motor, the output terminal of the controllable switch module 20 is connected to one end of the absorption device 30, and the other end of the absorption device 30 is connected to the negative terminal of the power supply terminal of the stepper motor.

[0054] The two examples above only illustrate two ways in which the controllable switch module 20 and the absorption device 30 are connected in series. No specific limitation is made here, and the specific method can be determined according to the specific situation. All of them are within the protection scope of this application.

[0055] In one specific example, the absorption device 30 includes at least one resistor. If the absorption device 30 includes at least two absorption resistors, the two absorption resistors can be connected in series and parallel, with the two ends of the formed branch serving as the two ends of the absorption device 30. If the absorption device 30 includes one absorption resistor, the two ends of the absorption resistor serve as the two ends of the absorption device 30, for example, as shown in... Figure 1 Rx in the text.

[0056] The above example only illustrates one specific implementation of the absorption device 30. In practical applications, it includes but is not limited to this, and is subject to specific limitations. It can be determined according to the specific circumstances, and all are within the protection scope of this application.

[0057] The signal that turns on the controllable switch module 20 is the signal output by comparator 10 when the first voltage V1 is greater than the second voltage V2.

[0058] It should be noted that the absorption device 30 is a very mature device in the prior art, and will not be described in detail here.

[0059] In this embodiment, since the signal that turns on the controllable switch module 20 is the signal output by the comparator 10 when the first voltage V1 is greater than the second voltage V2, where the first voltage V1 represents the actual value and the second voltage V2 represents the set threshold, the controllable switch module 20 turns on when the actual value is greater than the set threshold. Furthermore, since the controllable switch module 20 and the absorption device 30 are connected in series between the two poles of the stepper motor's power supply terminal, when the actual value is greater than the set threshold, part of the electrical energy at the stepper motor's power supply terminal can be consumed and released as heat, thus reducing the power supply terminal voltage. Therefore, this absorption circuit can reduce the back electromotive force generated by the stepper motor.

[0060] Another embodiment of this application provides a specific implementation of the controllable switch module 20, the specific structure of which is as follows: Figure 1 As shown, it specifically includes: switch Q, second resistor R2 and third resistor R3.

[0061] One end of the second resistor R2 is connected to the output of comparator 10. The other end of the second resistor R2, one end of the third resistor R3, and the control terminal of the switch Q are all connected. The input terminal of the switch Q serves as the input terminal of the controllable switch module 20. The output terminal of the switch Q and the other end of the third resistor R3 are both grounded to GND.

[0062] When the potential at the first input terminal of comparator 10 is greater than the potential at the second output terminal, the voltage across the third resistor R3 can turn on the switch Q. In practical applications, the second resistor R2 and the third resistor R3 are set according to the output of comparator 10 when the first voltage V1 is greater than the second voltage V1, and no specific limitation is made here.

[0063] Optionally, the switching transistor Q can be a MOSFET or a bipolar transistor. In practical applications, it includes but is not limited to either. No specific limitation is made here. It can be determined according to the specific situation, and all are within the protection scope of this application.

[0064] Since one end of the third resistor R3 is connected to the control terminal of the switch Q and the other end of the third resistor R3 is connected to the output terminal of the switch Q, and the voltage across the third resistor R3 can turn on the switch Q when the first voltage V1 is greater than the second voltage V2, if the switch Q is a MOS transistor, then the switch Q is an NMOS transistor; if the switch Q is a transistor, then the switch Q is an NPN transistor.

[0065] If the switching transistor Q is a MOSFET, then as follows Figure 1 As shown, a diode D can be added to the absorption circuit to serve as a discharge path for the switching transistor Q. Specifically, the anode of diode D is connected to the drain of the switching transistor Q, and the cathode of diode D is connected to the positive terminal of the stepper motor's power supply.

[0066] The above is only one specific implementation of the controllable switch module 20. In practical applications, it includes, but is not limited to, this one. It can be determined according to the specific situation and is within the protection scope of this application.

[0067] Another embodiment of this application provides another implementation of the absorption circuit for a stepper motor, the specific structure of which can be found in [reference needed]. Figure 2 ( Figure 2 exist Figure 1 (This is based on the previous embodiment). This embodiment, based on any of the above embodiments, also includes: a step-down circuit 40.

[0068] The input terminal of the stepper circuit 40 is connected to the positive terminal of the power supply terminal of the stepper motor, and the output terminal of the stepper circuit 40 is connected to the first input terminal of the comparator 10.

[0069] The step-down circuit 40 is used to reduce the potential of the positive terminal of the power supply terminal of the stepper motor to a first voltage V1. Since the negative terminal of the power supply terminal of the stepper motor is normally grounded (GND), the potential of the positive terminal of the power supply terminal of the stepper motor is equal to the above-mentioned actual value, so the step-down circuit 40 is used to reduce the above-mentioned actual value to the first voltage V1.

[0070] The above is only one implementation of the absorption circuit of the stepper motor. In practical applications, it includes, but is not limited to, the step-down circuit 40 not included in the absorption circuit of the stepper motor. No specific limitation is made here. It can be determined according to the specific situation. All of them are within the protection scope of this application.

[0071] Another embodiment of this application provides another implementation of the absorption circuit for a stepper motor, the specific structure of which can be found in [reference needed]. Figure 2 ( Figure 2 (This example only illustrates the implementation of both a step-down circuit 40 and a voltage generation circuit 50.) Based on any of the above embodiments, this implementation further includes a voltage generation circuit 50; that is, the absorption circuit may include only the voltage generation circuit 50, or it may include both the step-down circuit 40 and the voltage generation circuit 50 simultaneously.

[0072] The input terminal of the voltage generation circuit 50 is connected to the positive terminal of the power supply terminal of the stepper motor, and the output terminal of the voltage generation circuit 50 is connected to the second input terminal of the comparator 10.

[0073] The voltage generation circuit 50 is used to generate a second voltage V2. Since the negative terminal of the stepper motor's power supply is normally grounded (GND), the positive terminal potential of the stepper motor's power supply is equal to the actual value mentioned above. Therefore, the voltage generation circuit 50 is used to generate the second voltage V2 based on the actual value mentioned above.

[0074] The above is only one implementation of the absorption circuit of the stepper motor. In practical applications, it includes, but is not limited to, the voltage generation circuit 50 not included in the absorption circuit of the stepper motor. No specific limitation is made here, and it can be determined according to the specific situation. All of them are within the protection scope of this application.

[0075] Another embodiment of this application provides a specific implementation of the step-down circuit 40, the specific structure of which can be found in [reference needed]. Figure 3 ( Figure 3 Only Figure 2 (This is illustrated using two step-down branches 42 as an example). This implementation specifically includes: a first selection switch 41 and at least two step-down branches 42.

[0076] The input and output terminals of the first selection switch 41 are in one-to-one correspondence. For example, assuming that the first selection switch 41 has two input terminals and two output terminals, then the first input terminal of the first selection switch 41 corresponds to the first output terminal, and the second input terminal of the first selection switch 41 corresponds to the second output terminal.

[0077] The first selection switch 41 is a switch that can manually control whether its input terminal is connected to the corresponding output terminal. For example, assuming that the first selection switch 41 has two input terminals and two output terminals, it can manually control whether the first input terminal of the first selection switch 41 is connected to the first output terminal, and it can manually control whether the second input terminal of the first selection switch 41 is connected to the second output terminal.

[0078] Optionally, the first selection switch 41 can be a DIP switch, such as... Figure 3 As shown, in practical applications, including but not limited to this, no specific limitation is made here, and it can be determined according to the specific circumstances, all of which are within the protection scope of this application.

[0079] The step-down branch 42 corresponds one-to-one with the voltage level of the stepper motor. That is, the step-down branch is used to reduce the actual value of the power supply terminal voltage to the first voltage V1 when the stepper motor has the corresponding voltage level. For example, assuming the stepper motor has two voltage levels, 24V and 48V, the power supply terminal voltage can be either 24V or 48V, and there are two step-down branches 42, then... Figure 3 As shown, the step-down branch 42 on the right corresponds to 24V, that is, the step-down branch 42 on the right is used to reduce the actual value of the power supply terminal voltage to the first voltage V1 when the power supply terminal voltage is 24V. The step-down branch 42 on the left corresponds to 48V, that is, the step-down branch 42 on the left is used to reduce the actual value of the power supply terminal voltage to the first voltage V1 when the power supply terminal voltage is 48V.

[0080] It should be noted that the voltage reduction requirement of the step-down branch 42, that is, the ratio of the first voltage V1 output by the step-down branch 42 to the above actual value, is set according to the actual situation and is not specifically limited here.

[0081] The input terminals of the step-down branch 42 are connected one-to-one with the output terminals of the first selector switch 41. For example, assuming there are two step-down branches 42, then... Figure 3 As shown, the step-down branch 42 on the left is connected to the first output terminal of the first selector switch 41, and the step-down branch 42 on the right is connected to the second output terminal of the first selector switch 41.

[0082] The input terminals of the first selector switch 41, corresponding one-to-one with the first target output terminal, are connected to the positive terminal of the power supply of the stepper motor. The first target output terminal is the output terminal of the first selector switch 41 connected to the step-down branch 42. For example, assuming that the first input terminal of the first selector switch 41 corresponds to the first output terminal, and the second input terminal of the first selector switch 41 corresponds to the second output terminal, the step-down branch 42 on the left is connected to the first output terminal of the first selector switch 41, and the step-down branch 42 on the right is connected to the second output terminal of the first selector switch 41, then both the first output terminal and the second output terminal of the first selector switch 41 are the first target output terminals, that is, both the first input terminal and the second input terminal of the first selector switch 41 are connected to the positive terminal of the power supply of the stepper motor.

[0083] The output of step-down branch 42 is connected to the first input of comparator 10. For example, assuming there are two step-down branches 42, then... Figure 3 As shown, the output terminals of both the left and right step-down branches 42 are connected to the first input terminal of the comparator 10.

[0084] Since the step-down branch 42 corresponds one-to-one with the voltage level of the stepper motor, the appropriate step-down branch 42 needs to be selected to step down the actual value according to the voltage level. For example, assuming that the step-down branch 42 on the right corresponds to 24V and the step-down branch 42 on the left corresponds to 48V, then when the stepper motor's supply voltage is 24V, the step-down branch 42 on the right is used to step down the actual value, and when the stepper motor's supply voltage is 48V, the step-down branch 42 on the left is used to step down the actual value.

[0085] Since the input terminals of the step-down branch 42 are connected one-to-one with the output terminals of the first selector switch 41, and the input terminals of the first selector switch 41 that correspond one-to-one with the first target output terminals are connected to the positive terminal of the power supply terminal of the stepper motor, and the first selector switch 41 is a switch that can manually control whether its input terminal is connected to the corresponding output terminal, if you want to use a certain step-down branch 42 to step down the above actual value, you need to manually control the corresponding input terminal of the first selector switch 41 to connect to the corresponding output terminal.

[0086] For example, assuming the stepper motor's supply voltage is 24V, the right-side step-down branch 42 is used to step down the actual value. If the stepper motor's supply voltage is 48V, the left-side step-down branch 42 is used to step down the actual value. The left-side step-down branch 42 is connected to the first output terminal of the first selector switch 41, and the right-side step-down branch 42 is connected to the second output terminal of the first selector switch 41. The first input terminal of the first selector switch 41 corresponds to its first output terminal, and the second input terminal of the first selector switch 41 corresponds to its second output terminal. Then, as follows... Figure 3As shown, when the power supply voltage of the stepper motor is 24V, it is necessary to manually control the second input terminal of the first selection switch 41 to connect with the second output terminal. When the power supply voltage of the stepper motor is 48V, it is necessary to manually control the first input terminal of the first selection switch 41 to connect with the first output terminal.

[0087] In a specific example, such as Figure 3 As shown, the step-down branch 42 includes at least two resistors connected in series. One end of the series branch serves as the input terminal of the step-down branch 42, and the other end is grounded to GND. The other end of the resistor with one end grounded to GND serves as the output terminal of the step-down branch 42. Furthermore, in practical applications, the resistance values ​​of each resistor are set according to the applicable voltage level and step-down ratio of the step-down branch 42; no specific limitations are made here.

[0088] It should be noted that the resistance value of the resistor in the step-down branch 42 is set according to the step-down requirement of the step-down branch 42, and no specific limitation is made here.

[0089] For example, such as Figure 3 As shown, the step-down branch 42 on the right is suitable for a voltage level of 24V. It includes two resistors: one end of the fourth resistor R4 is grounded to GND, and the other end of the fourth resistor R4 is connected to one end of the fifth resistor R5. The other end of the fifth resistor R5 serves as the input terminal of the step-down branch 42, and the connection point of the fourth resistor R4 and the fifth resistor R5 serves as the output terminal of the step-down branch 42.

[0090] For example, such as Figure 3 As shown, the step-down branch 42 on the left is suitable for a voltage level of 48V. It includes three resistors: one end of the sixth resistor R6 is grounded to GND, the other end of the sixth resistor R6 is connected to one end of the seventh resistor R7, the other end of the seventh resistor R7 is connected to one end of the eighth resistor R8, the other end of the eighth resistor R8 serves as the input terminal of the step-down branch 42, and the connection point of the sixth resistor R6 and the seventh resistor R7 serves as the output terminal of the step-down branch 42.

[0091] In addition, a capacitor is usually connected in parallel across the resistor with one end grounded (GND) to reduce AC impedance and enhance filtering effect. For example, ... Figure 3 As shown, the step-down branch 42 on the right also includes a first capacitor C1, which is connected in parallel with the fourth resistor R4. For example, as... Figure 3 As shown, the step-down branch 42 on the left also includes a second capacitor C2, which is connected in parallel with the sixth resistor R6.

[0092] It should be noted that if the resistors in multiple step-down branches 42 have the same resistance value, then these resistors can be reused in multiple step-down branches 42. Similarly, if the capacitors in multiple step-down branches 42 have the same capacitance value, then these capacitors can be reused in multiple step-down branches 42. For example, suppose... Figure 3 The fourth resistor R4 and the sixth resistor R6 have the same resistance value, and the first capacitor C1 and the second capacitor C2 have the same capacitance value. Then, as follows... Figure 4 As shown, the right-side step-down branch 42 reuses the sixth resistor R6 as the fourth resistor R4, and the right-side step-down branch 42 reuses the second capacitor C2 as the first capacitor C1.

[0093] The above example only shows one specific implementation of the step-down branch 42. In practical applications, there are other implementations, including but not limited to this one. No specific limitation is made here. The implementation can be determined according to the specific circumstances, and all of them are within the protection scope of this application.

[0094] In this embodiment, by setting a first selection switch 41 and at least two step-down branches 42, the step-down circuit 40 can be applied to different voltage levels of the stepper motor. Therefore, the absorption circuit can be applied to stepper motors with different voltage levels, thereby making the application range of the absorption circuit wider.

[0095] The above is only one specific implementation of the step-down circuit 40. In practical applications, it includes, but is not limited to, this one. It can be determined according to the specific situation and is within the protection scope of this application.

[0096] Another embodiment of this application provides a specific implementation of the voltage generation circuit 50, the specific structure of which can be found in [reference needed]. Figure 3 ( Figure 3 Only Figure 2 (This is illustrated using two voltage divider branches 53 as an example). This implementation specifically includes: a second selection switch 51, a first clamping device 52, and at least two voltage divider branches 53.

[0097] The anode of the first clamping device 52 is grounded to GND, and the cathode of the first clamping device 52 is connected to the second input terminal of the comparator 10.

[0098] Optionally, the first clamping device 52 can be a Zener diode, such as... Figure 3 As shown in Z1, in practical applications, including but not limited to this, no specific limitation is made here, depending on the specific circumstances, all of which are within the protection scope of this application.

[0099] Since the anode of the first clamping device 52 is grounded (GND), if current flows through the first clamping device 52, the potential of the cathode of the first clamping device 52 remains constant. That is, the potential of the cathode of the first clamping device 52 does not change with its own current. Therefore, no matter which input terminal of the second selection switch 51 is connected to the corresponding output terminal, the second voltage V2 generated by the voltage generation circuit 50 is equal.

[0100] Each voltage divider branch 53 is connected in series. One end of the series branch is connected to the positive terminal of the power supply of the stepper motor, and the other end of the series branch is connected to the cathode of the first clamping device 52.

[0101] It should be noted that the voltage dividing capacity of each voltage dividing branch 53 is set according to the actual situation, and no specific limit is made here.

[0102] The input and output terminals of the second selection switch 51 are in one-to-one correspondence. Assuming that the second selection switch 51 has two input terminals and two output terminals, then the first input terminal of the second selection switch 51 corresponds to the first output terminal, and the second input terminal of the second selection switch 51 corresponds to the second output terminal.

[0103] The second selection switch 51 is a switch that can manually control whether its input terminal is connected to the corresponding output terminal. For example, assuming that the second selection switch 51 has two input terminals and two output terminals, it can manually control whether the first input terminal of the second selection switch 51 is connected to the first output terminal, and it can manually control whether the second input terminal of the second selection switch 51 is connected to the second output terminal.

[0104] Optionally, the second selection switch 51 can be a DIP switch, such as... Figure 3 As shown, in practical applications, including but not limited to this, no specific limitation is made here, and it can be determined according to the specific circumstances, all of which are within the protection scope of this application.

[0105] The connection points of the two voltage divider branches 53 are connected one-to-one with the output terminals of the second selector switch 51, and the connection points of the two voltage divider branches 53 are recorded as the target connection points. Assuming there are two voltage divider branches 53, then... Figure 3 As shown, the connection point between the lower voltage divider branch 53 and the upper voltage divider branch 53 is connected to the first output terminal of the second selector switch 51.

[0106] The input terminals on the second selector switch 51, which correspond one-to-one with the second target output terminal, are connected to the positive terminal of the power supply to the stepper motor. The second target output terminal is the output terminal on the second selector switch 51 connected to the voltage divider branch 53.

[0107] For example, assuming that the first input terminal of the second selector switch 51 corresponds to the first output terminal, and the second input terminal of the second selector switch 51 corresponds to the second output terminal, and the connection point of the lower voltage divider branch 53 and the upper voltage divider branch 53 is connected to the first output terminal of the second selector switch 51, then as follows: Figure 3 As shown, the first output terminal of the second selection switch 51 is the second target output terminal, that is, the first input terminal of the second selection switch 51 is connected to the positive terminal of the power supply terminal of the stepper motor.

[0108] Since the various voltage divider branches 53 are connected in series, one end of the series branch is connected to the positive terminal of the power supply of the stepper motor. Therefore, if the target connection point closer to the first clamping device 52 is connected to the positive terminal of the power supply of the stepper motor, the voltage divider branch 53 farther from the first clamping device 52 than this target connection point will be short-circuited. As a result, no current flows through the voltage divider branch 53 farther from the first clamping device 52 than this target connection point. Therefore, the output terminal of the second selection switch 51 connected to the target connection point closer to the first clamping device 52 will be connected to the corresponding input terminal when the voltage level of the stepper motor is lower.

[0109] For example, suppose the connection point between the lower voltage divider branch 53 and the upper voltage divider branch 53 is connected to the first output terminal of the second selector switch 51, and the first input terminal of the second selector switch 51 corresponds to the first output terminal, then as follows: Figure 3 As shown, when the stepper motor voltage level is 24V, the first input terminal of the manual control second selection switch 51 is connected to the first output terminal, that is, the voltage is generated through the lower voltage divider branch 53 and the first clamping device 52. When the stepper motor voltage level is 48V, the first input terminal of the manual control second selection switch 51 is not connected to the first output terminal, that is, the voltage is generated through the upper voltage divider branch 53, the lower voltage divider branch 53 and the first clamping device 52.

[0110] In a specific example, voltage divider branch 53 includes at least one resistor. If the number of resistors is greater than one, all resistors are connected in series, and the two ends of the series branch serve as the two ends of voltage divider branch 53. If the number of resistors is equal to one, the two ends of the resistor serve as the two ends of voltage divider branch 53.

[0111] For example, such as Figure 3 As shown, the voltage divider branch 53 below includes two resistors. One end of the ninth resistor R9 serves as one end of the voltage divider branch 53, and the other end of the ninth resistor R9 is connected to one end of the tenth resistor R10. The other end of the tenth resistor R10 serves as the other end of the voltage divider branch 53.

[0112] It should be noted that the resistance value of the resistor in voltage divider branch 53 is set according to the voltage dividing capability of voltage divider branch 53, and no specific limitation is made here.

[0113] In another specific example, the voltage divider branch 53, based on the implementation shown in the previous example, further includes a third clamping device 531, which is connected in series with a resistor, and it is necessary to ensure that the allowable current direction of the third clamping device 531 is opposite to the direction of the current flowing through the voltage divider branch 53.

[0114] Optionally, the third clamping device 531 can be a Zener diode, for example, such as... Figure 3 As shown in Z2, in practical applications, including but not limited to this, no specific limitation is made here, depending on the specific circumstances, all of which are within the protection scope of this application.

[0115] For example, such as Figure 3 As shown, the voltage divider branch 53 above includes an eleventh resistor R11 and a third clamping device 531. One end of the eleventh resistor R11 is connected to the positive terminal of the power supply of the stepper motor, and the other end of the eleventh resistor R11 is connected to the cathode of the third clamping device 531. The anode of the third clamping device 531 is connected to the cathode of the first clamping device 52 through the voltage divider branch 53 below.

[0116] It should be noted that the resistance value of the resistor in the voltage divider branch 53 and the voltage division value of the third clamping device 531 are set according to the voltage division capability of the voltage divider branch 53, and no specific limitation is made here.

[0117] The two examples above only illustrate two implementations of the voltage divider branch 53. In practical applications, there are other implementations, including but not limited to these. No specific limitation is made here. The implementation can be determined according to the specific circumstances, and all are within the protection scope of this application.

[0118] In this embodiment, by setting the second selection switch 51, the voltage generation circuit 50 can be applied to different voltage levels of the stepper motor, thus making the absorption circuit applicable to stepper motors with different voltage levels, thereby making the application range of the absorption circuit wider.

[0119] The above is only one specific implementation of the voltage generation circuit 50. In practical applications, it includes, but is not limited to, this one. It can be determined according to the specific situation and is within the protection scope of this application.

[0120] Another embodiment of this application provides another specific implementation of the voltage generation circuit 50, the specific structure of which can be found in [reference needed]. Figure 3 ( Figure 3 Only Figure 2 (This is illustrated using two voltage divider branches 53 as an example). This embodiment, based on the embodiment provided in the previous embodiment, also includes: a first resistor R1 and a second clamping device 54.

[0121] One end of the first resistor R1 is connected to the connection point between the target voltage divider branch and the second selector switch 51; the target voltage divider branch is the voltage divider branch 53 connected to the first clamping device 52. For example, as... Figure 3 As shown, the voltage divider branch 53 below is the target voltage divider branch, that is, one end of the first resistor R1 is connected to the connection point between the voltage divider branch 53 below and the second selector switch 51.

[0122] Optionally, the second clamping device 54 can be a Zener diode, for example, such as... Figure 3 As shown in Z3, in practical applications, including but not limited to this, no specific limitation is made here, depending on the specific circumstances, all of which are within the protection scope of this application.

[0123] The other end of the first resistor R1 is connected to the cathode of the second clamping device 54, and the anode of the second clamping device 54 is grounded to GND.

[0124] Since the cathode of the second clamping device 54 is connected to the first resistor R1, and the anode of the second clamping device 54 is grounded (GND), the potential of the cathode of the second clamping device 54 remains constant, meaning that the potential of the cathode of the second clamping device 54 does not change with its own current. In practical applications, both the second clamping device 54 and the first resistor R1 are set according to actual conditions, and no specific limitations are made here.

[0125] It should be noted that if the resistance value of the first resistor R1 is the same as the resistance value in the voltage divider branch 53, then the first resistor R1 can reuse the resistor in the corresponding voltage divider branch 53. For example, suppose... Figure 3 The first resistor R1 in the circuit has the same resistance value as the tenth resistor R10 in the voltage divider branch 53 below. Then, as follows... Figure 4 As shown, the tenth resistor R10 is reused as the first resistor R1.

[0126] In a specific example, such as Figure 4 As shown, the potential of the cathode of the second clamping device 54 is equal to the fifth voltage V5, that is, the output terminal of the comparator 10 is connected to one end of the pull-up resistor Rh, and the other end of the pull-up resistor Rh is connected to the cathode of the second clamping device 54.

[0127] It should be noted that, under normal circumstances, in order to ensure the stability of the cathode potential of the second clamping device 54, a capacitor C3 is provided between the cathode of the second clamping device 54 and ground GND, such as... Figure 4 As shown.

[0128] The above example only shows one connection method for the cathode potential of the second clamping device 54. In practical applications, there are other methods, including but not limited to this one. No specific limitation is made here. It can be determined according to the specific situation, and all are within the protection scope of this application.

[0129] In this embodiment, the potential of the cathode of the second clamping device 54 remains constant, that is, the potential of the cathode of the second clamping device 54 does not change with its own current. Therefore, this embodiment can provide a constant voltage, thereby eliminating the need for an additional voltage source and reducing costs.

[0130] The above is only one specific implementation of the voltage generation circuit 50. In practical applications, it includes, but is not limited to, this one. It can be determined according to the specific situation and is within the protection scope of this application.

[0131] Another embodiment of this application provides another specific implementation of the absorption circuit for a stepper motor, which is applicable to the following situations: the voltage generation circuit 50 adopts the implementation method provided in any of the above embodiments; the absorption circuit of the stepper motor includes a step-down circuit 40; and the step-down circuit 40 adopts an implementation method including a first selection switch 41. The difference between this implementation method and the implementation method provided in any of the above embodiments is that:

[0132] In this embodiment, the second selection switch 51 and the first selection switch 41 are integrated into a single selection switch, such as... Figure 5 60 shown.

[0133] In this embodiment, the first selection switch 41 and the second selection switch 51 are integrated together, so that the absorption circuit of the stepper motor only needs to be equipped with one selection switch, thereby reducing the overall cost of the absorption circuit of the stepper motor.

[0134] The above is only one specific implementation of the absorption circuit of the stepper motor. In practical applications, there are other implementations, including but not limited to this one. No specific limitation is made here. The implementation can be determined according to the specific situation, and all of them are within the protection scope of this application.

[0135] The following explanation uses the example of integrating the second selector switch 51 and the first selector switch 41 into a single selector switch, where the integrated selector switch is a DIP switch:

[0136] Assuming the step-down circuit 40 includes two step-down branches 42, and the voltage generation circuit 50 includes two voltage divider branches, the three output terminals of the DIP switch from left to right are connected sequentially to: the input terminal of the left step-down branch 42, the input terminal of the right step-down branch 42, and the connection point of the two voltage divider branches 42. The rightmost output terminal of the DIP switch is unconnected. The three input terminals of the DIP switch from left to right are all connected to the positive terminal of the stepper motor's power supply. The rightmost input terminal of the DIP switch is unconnected. Then, when the stepper motor's voltage level is 24V, the DIP switch is switched to 011X, i.e., the step-down branch on the left. The input terminal of the step-down branch 42 is not connected to the positive terminal of the stepper motor's power supply. The input terminal of the step-down branch 42 on the right is connected to the positive terminal of the stepper motor's power supply. The connection point of the two voltage divider branches 42 is connected to the positive terminal of the stepper motor's power supply. When the stepper motor's voltage level is 48V, the DIP switch is switched to 100X, that is, the input terminal of the step-down branch 42 on the left is connected to the positive terminal of the stepper motor's power supply, the input terminal of the step-down branch 42 on the right is not connected to the positive terminal of the stepper motor's power supply, and the connection point of the two voltage divider branches 42 is not connected to the positive terminal of the stepper motor's power supply.

[0137] Another embodiment of this application provides another implementation of the absorption circuit for a stepper motor, the specific structure of which can be found in [reference needed]. Figure 6 ( Figure 6 Only Figure 5 (This is based on the above embodiments). This embodiment, based on any of the above embodiments, also includes: a filter circuit 70, that is, the absorption circuit may only include the filter circuit 70, or it may include both the filter circuit 70 and at least one of the following: a step-down circuit 40 and a voltage generation circuit 50.

[0138] One end of the filter circuit 70 is connected to the positive terminal of the stepper motor's power supply. The controllable switch module 20 and the absorption device 30 are connected in series between the other end of the filter circuit 70 and the negative terminal of the stepper motor's power supply. The filter circuit 70 is used to absorb transient voltage spikes, smooth voltage fluctuations, and suppress low-frequency noise.

[0139] In a specific example, the first end of the filter circuit 70 is connected to the positive terminal of the power supply of the stepper motor, one end of the absorption device 30 is connected to the second end of the filter circuit 70, the other end of the absorption device 30 is connected to the input terminal of the controllable switch module 20, and the output terminal of the controllable switch module 20 is connected to the negative terminal of the power supply of the stepper motor.

[0140] In another specific example, the first end of the filter circuit 70 is connected to the positive terminal of the power supply terminal of the stepper motor, the input terminal of the controllable switch module 20 is connected to the second end of the filter circuit 70, the output terminal of the controllable switch module 20 is connected to one end of the absorption device 30, and the other end of the absorption device 30 is connected to the negative terminal of the power supply terminal of the stepper motor.

[0141] The two examples above illustrate two connection methods for the filter circuit 70. No specific limitation is made here, and the method can be determined according to the specific situation. Both are within the protection scope of this application.

[0142] In a specific example, the filter circuit includes multiple capacitors connected in parallel, such as Figure 6 As shown in C4, C5, C6, and C7.

[0143] The above is only one specific implementation of the filter circuit 70. In practical applications, there are other implementations, including but not limited to this one. No specific limitation is made here. The implementation can be determined according to the specific circumstances, and all of them are within the protection scope of this application.

[0144] In this embodiment, since a filter circuit 70 is added, transient voltage spikes can be absorbed, voltage fluctuations can be smoothed, and low-frequency noise can be suppressed. Therefore, the possibility of comparator 10 misjudging is reduced, thereby reducing the possibility of the controllable switch module 20 being frequently turned on due to comparator 10 misjudgment, and thus reducing the failure rate of the stepper motor's absorption circuit.

[0145] The above is only one implementation of the absorption circuit of the stepper motor. In practical applications, there are other implementations, including but not limited to this one. No specific limitation is made here. The implementation can be determined according to the specific situation, and all of them are within the protection scope of this application.

[0146] Another embodiment of this application provides another implementation of the absorption circuit for a stepper motor, the specific structure of which can be found in [reference needed]. Figure 6 ( Figure 6 Only Figure 5 (This is based on the above embodiments). This embodiment, based on any of the above embodiments, also includes: an optocoupler 80, that is, the absorption circuit may only include the optocoupler 80, or it may include both the optocoupler 80 and at least one of the following: a step-down circuit 40, a voltage generation circuit 50, and a filter circuit 70.

[0147] The primary input of optocoupler 80 is connected to the output of comparator 10, and the primary output of optocoupler 80 is grounded to GND. The secondary input of optocoupler 80 receives a third voltage V3, and the secondary output of optocoupler 80 is connected to the control terminal of controllable switch module 20. The third voltage V3 is the voltage that enables controllable switch module 20 to conduct. The third voltage V3 may or may not be equal to the fifth voltage V5. If the third voltage V3 is equal to the fifth voltage V5, and the voltage generation circuit 50 can provide the fifth voltage V5, then the cathode of the second clamping device 54 is connected to the secondary input of optocoupler 80.

[0148] It should be noted that the optocoupler 80 is a very mature device in existing technology, and will not be described in detail here. Additionally, under normal circumstances, such as... Figure 6As shown, the input terminal of the primary side of the optocoupler 80 is connected to the output terminal of the comparator 10 through the twelfth resistor R12.

[0149] In this embodiment, the addition of optocoupler 80 achieves electrical isolation between comparator 10 and controllable switch module 20, thereby reducing the impact of the power supply voltage on comparator 10 and improving the safety of comparator 10.

[0150] The above is only one implementation of the absorption circuit of the stepper motor. In practical applications, there are other implementations, including but not limited to this one. No specific limitation is made here. The implementation can be determined according to the specific situation, and all of them are within the protection scope of this application.

[0151] Another embodiment of this application provides another implementation of the absorption circuit for a stepper motor, the specific structure of which can be found in [reference needed]. Figure 6 ( Figure 6 Only Figure 5 (This is based on the above embodiments). This embodiment, based on any of the above embodiments, also includes: a first prompting device 90, that is, the absorption circuit may only include the first prompting device 90, or it may include both the first prompting device 90 and at least one of the following: a step-down circuit 40, a voltage generation circuit 50, a filter circuit 70, and an optocoupler 80.

[0152] The positive terminal of the first prompting device 90 is connected to the positive terminal of the power supply of the stepper motor, and the negative terminal of the first prompting device 90 is connected to the negative terminal of the power supply of the stepper motor. If a filter circuit 70 is also included, the first terminal of the filter circuit 70 is connected to the positive terminal of the power supply of the stepper motor, and the positive terminal of the first prompting device 90 is connected to the second terminal of the filter circuit 70.

[0153] Since the negative terminal of the stepper motor's power supply is usually grounded (GND), if the above actual value is not equal to zero, meaning the stepper motor's power supply is energized, the first alerting device 90 will be powered on and function normally, issuing an alert. Conversely, if the above actual value is equal to zero, meaning the stepper motor's power supply is de-energized, the first alerting device 90 will be de-energized and will not issue an alert. Therefore, by checking whether the first alerting device 90 issues an alert, the operator can determine whether the stepper motor's power supply is energized.

[0154] In a specific example, such as Figure 6 As shown, the first prompting device 90 is an LED, and the prompts emitted by the first prompting device 90 are light. The prompts emitted by the first prompting device 90 can even be different colors of light, such as green.

[0155] Because the aforementioned actual value is relatively high, in order to reduce the possibility of damage to the first alerting device 90, such as Figure 6As shown, a thirteenth resistor R13 is connected in series in the branch where the first prompting device 90 is located. In practical applications, the resistance value of the thirteenth resistor R13 is determined based on the actual value mentioned above and the voltage rating of the first prompting device 90, and is not specifically limited here.

[0156] The above example only shows one specific implementation of the first prompting device 90. In practical applications, it includes, but is not limited to, this example. It is not specifically limited here and can be determined according to the specific circumstances. All of them are within the protection scope of this application.

[0157] In this embodiment, since a first prompting device 90 is added, the operator can know whether the power supply terminal of the stepper motor has power by observing whether the first prompting device 90 issues a prompt, thus making it easier for the operator to determine whether the power supply terminal of the stepper motor has power.

[0158] The above is only one implementation of the absorption circuit of the stepper motor. In practical applications, there are other implementations, including but not limited to this one. No specific limitation is made here. The implementation can be determined according to the specific situation, and all of them are within the protection scope of this application.

[0159] Another embodiment of this application provides another implementation of the absorption circuit for a stepper motor, applicable to the following situation: the input terminal of the controllable switch module 20 is connected to the positive terminal of the power supply of the stepper motor through the absorption device 30, and the output terminal of the controllable switch module 20 is connected to the negative terminal of the power supply of the stepper motor. For the specific structure of this embodiment, please refer to... Figure 6 ( Figure 6 Only Figure 5 (This is based on the above embodiments). This embodiment, based on any of the above embodiments, also includes: a second prompting device 100, that is, the absorption circuit may only include the second prompting device 100, or it may include both the second prompting device 100 and at least one of the following: a step-down circuit 40, a voltage generation circuit 50, a filter circuit 70, an optocoupler 80, and a first prompting device 90.

[0160] The positive terminal of the second prompting device 100 receives a fourth voltage V4, and the negative terminal of the second prompting device 100 is connected to the input terminal of the controllable switch module 20. The fourth voltage V4 may or may not be equal to the fifth voltage V5. If the fourth voltage V4 is equal to the fifth voltage V5, and the voltage generation circuit 50 is able to provide the fifth voltage V5, then the cathode of the second clamping device 54 is connected to the positive terminal of the second prompting device 100.

[0161] Since the negative terminal of the stepper motor's power supply is usually grounded (GND), the output terminal of the controllable switch module 20 is also grounded (GND). Therefore, when the controllable switch module 20 is in the ON state, the negative terminal of the second indicator device 100 is grounded (GND), and when the controllable switch module 20 is in the OFF state, the negative terminal of the second indicator device 100 is not grounded (GND). Thus, when the controllable switch module 20 is in the ON state, the second indicator device 100 is powered on and works normally, i.e., it issues an indicator; when the controllable switch module 20 is in the OFF state, the second indicator device 100 is powered off and does not work, i.e., it does not issue an indicator. By checking whether the second indicator device 100 issues an indicator, the operator can determine whether the absorption circuit consumes some of the power supply energy of the stepper motor. In other words, the operator can determine whether the absorption circuit protects the stepper motor.

[0162] In a specific example, such as Figure 6 As shown, the second prompting device 100 is an LED, and the prompts emitted by the second prompting device 100 are light. The prompts emitted by the second prompting device 100 can even be different colors of light, such as red.

[0163] The above example only illustrates one specific implementation of the second prompting device 100. In practical applications, it includes, but is not limited to, this example. It can be determined according to the specific circumstances and is within the protection scope of this application.

[0164] If the stepper motor's absorption circuit includes both an optocoupler 80 and a second indicating device 100, then the fourth voltage V4 can be equal to the third voltage V3. Alternatively, the fourth voltage V4 can also be equal to the fifth voltage V5.

[0165] Since the fifth voltage V5 may be high, in order to reduce the possibility of damage to the second indicator device 100, such as Figure 6 As shown, a fourteenth resistor R14 is connected in series in the branch where the second prompting device 100 is located. In practical applications, the resistance value of the fourteenth resistor R14 is determined according to the fourth voltage V4 and the voltage rating of the second prompting device 100, and is not specifically limited here.

[0166] In this embodiment, since a second prompting device 100 is added, the operator can know whether the absorption circuit protects the stepper motor by observing whether the second prompting device issues a prompt. This makes it easier for the operator to determine whether the absorption circuit protects the stepper motor.

[0167] The above is only one implementation of the absorption circuit of the stepper motor. In practical applications, there are other implementations, including but not limited to this one. No specific limitation is made here. The implementation can be determined according to the specific situation, and all of them are within the protection scope of this application.

[0168] Another embodiment of this application provides a motor device, which specifically includes: a stepper motor and a snubber circuit for the stepper motor as provided in any of the above embodiments.

[0169] It should be noted that the connection between the stepper motor's absorption circuit and the stepper motor has been described in detail in the above embodiments, and is not specifically limited here, depending on the specific situation.

[0170] In this embodiment, since the motor device includes the absorption circuit of the stepper motor as provided in the above embodiment, the motor device can consume part of the electrical energy of the power supply terminal of the stepper motor and release it as heat, that is, it can reduce the voltage of the power supply terminal. Therefore, the absorption circuit can reduce the back electromotive force generated by the stepper motor.

[0171] The features described above in the disclosed embodiments can be substituted or combined with each other, enabling those skilled in the art to implement or use this application. The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present utility model using the disclosed methods and techniques, or modify it into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of the present utility model. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A snubber circuit for a stepper motor, characterized by include: Comparator, controllable switching module, and absorption device; wherein: The first input terminal of the comparator receives a first voltage; The first voltage is the actual value of the power supply terminal voltage of the stepper motor; The second input terminal of the comparator receives a second voltage; the second voltage is a voltage representing a set threshold voltage of the power supply terminal. The output of the comparator is connected to the control terminal of the controllable switch module. The controllable switch module and the absorption device are connected in series between the two poles of the power supply terminal of the stepper motor; The signal that turns on the controllable switch module is the signal output by the comparator when the first voltage is greater than the second voltage.

2. The snubber circuit for a stepper motor as set forth in claim 1, wherein Also includes: Step-down circuit; where: The input terminal of the step-down circuit is connected to the positive terminal of the power supply terminal of the stepper motor, and the output terminal of the step-down circuit is connected to the first input terminal of the comparator.

3. The snubber circuit for a stepper motor as set forth in claim 2, wherein The step-down circuit includes: a first selection switch and at least two step-down branches; wherein: The input and output terminals of the first selection switch correspond one-to-one; the first selection switch is a switch that can be manually controlled to determine whether its input terminal is connected to the corresponding output terminal. The input terminal of the step-down branch is connected to the output terminal of the first selector switch in a one-to-one correspondence; the step-down branch corresponds to the voltage level of the stepper motor in a one-to-one correspondence. The input terminals on the first selector switch that correspond one-to-one with the first target output terminals are connected to the positive terminal of the power supply terminal of the stepper motor; the first target output terminal is the output terminal on the first selector switch connected to the step-down branch; The output of the step-down branch is connected to the first input of the comparator.

4. The snubber circuit for a stepper motor as set forth in claim 1, wherein Also includes: Voltage generation circuit; wherein: The input terminal of the voltage generation circuit is connected to the positive terminal of the power supply terminal of the stepper motor, and the output terminal of the voltage generation circuit is connected to the second input terminal of the comparator.

5. The snubber circuit for a stepper motor as set forth in claim 4, wherein The voltage generation circuit includes: a second selection switch, a first clamping device, and at least two voltage divider branches; wherein: The anode of the first clamping device is grounded, and the cathode of the first clamping device is connected to the second input terminal of the comparator. Each of the voltage divider branches is connected in series, one end of the series branch is connected to the positive terminal of the power supply terminal of the stepper motor, and the other end of the series branch is connected to the cathode of the first clamping device. The input and output terminals of the second selection switch correspond one-to-one; the second selection switch is a switch that can manually control whether its input terminal is connected to the corresponding output terminal; The connection points of the two voltage divider branches are connected one-to-one with the output terminal of the second selector switch; The input terminals on the second selector switch that correspond one-to-one with the second target output terminals are connected to the positive terminal of the power supply terminal of the stepper motor; the second target output terminal is the output terminal on the second selector switch connected to the voltage divider branch.

6. The snubber circuit for a stepper motor as set forth in claim 5, wherein The voltage generation circuit further includes: a first resistor and a second clamping device; wherein: One end of the first resistor is connected to the connection point between the target voltage divider branch and the second selector switch; the target voltage divider branch is the voltage divider branch connected to the first clamping device; The other end of the first resistor is connected to the cathode of the second clamping device, and the anode of the second clamping device is grounded.

7. The snubber circuit for a stepper motor as set forth in claim 6, wherein The output of the comparator is connected to one end of a pull-up resistor, and the other end of the pull-up resistor is connected to the cathode of the second clamping device.

8. The snubber circuit for a stepper motor as set forth in claim 5, wherein The absorption circuit of the stepper motor includes a step-down circuit, which includes a first selection switch; The second selection switch and the first selection switch are integrated into a single selection switch.

9. The snubber circuit for a stepper motor as claimed in any one of claims 1 to 8, wherein Also includes: A filter circuit, and / or an optocoupler, and / or a first prompting device, and / or a second prompting device; wherein: One end of the filter circuit is connected to the positive terminal of the power supply of the stepper motor, and the controllable switch module is connected in series with the absorption device between the other end of the filter circuit and the negative terminal of the power supply of the stepper motor. The input terminal of the primary side of the optocoupler is connected to the output terminal of the comparator, the output terminal of the primary side of the optocoupler is grounded, the input terminal of the secondary side of the optocoupler receives a third voltage, and the output terminal of the secondary side of the optocoupler is connected to the control terminal of the controllable switch module; the third voltage is a voltage that enables the controllable switch module to conduct. The positive terminal of the first prompting device is connected to the positive terminal of the power supply terminal of the stepper motor, and the negative terminal of the first prompting device is connected to the negative terminal of the power supply terminal of the stepper motor. The input terminal of the controllable switch module is connected to the positive terminal of the power supply terminal of the stepper motor through the absorption device, and the output terminal of the controllable switch module is connected to the negative terminal of the power supply terminal of the stepper motor. The positive terminal of the second prompting device receives a fourth voltage, and the negative terminal of the second prompting device is connected to the input terminal of the controllable switch module.

10. An electric machine arrangement, characterized in that include: A stepper motor and a snubber circuit for the stepper motor as described in any one of claims 1 to 9.

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