CN215984964U - Detection circuit and detection equipment - Google Patents
Detection circuit and detection equipment Download PDFInfo
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- CN215984964U CN215984964U CN202120697981.5U CN202120697981U CN215984964U CN 215984964 U CN215984964 U CN 215984964U CN 202120697981 U CN202120697981 U CN 202120697981U CN 215984964 U CN215984964 U CN 215984964U
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Abstract
The utility model provides a detection circuit and a detection device, wherein the detection circuit comprises: the device comprises a control module, a driving module and a current detection module; the driving module is connected with the control module, and the current detection module is connected with the control module and the driving module; the driving module is used for being connected with a motor to be detected; the control module records output characteristic data; the control module is used for outputting a driving signal to the driving module; the driving module is used for driving the motor according to the driving signal; the current detection module is used for acquiring current information of the motor; the control module is configured to determine torque information for the motor based on the output characteristic data and the current information. The embodiment of the utility model can determine the torque information of the motor according to the current information detected by the control module.
Description
Technical Field
The utility model relates to the technical field of detection, in particular to a detection circuit and detection equipment.
Background
Torque is a moment that causes an object to rotate. The torque of the motor is the torque output by the motor. Under the condition of fixed power, the torque of the motor is in inverse relation with the rotating speed of the motor, and the torque is smaller when the rotating speed is higher, and vice versa.
The motor stalling is an abnormal condition that the motor still outputs torque when the rotating speed is 0.
In the prior art, when the motor appears locked-rotor, the problem that the torque output by the motor is too small or the control signal of the motor appears cannot be known.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention has been made to provide a detection circuit and a detection device that overcome or at least partially solve the above problems.
In order to solve the above problem, the present invention discloses a detection circuit, comprising: the device comprises a control module, a driving module and a current detection module; the driving module is connected with the control module, and the current detection module is connected with the control module and the driving module; the driving module is used for being connected with a motor to be detected; the control module records output characteristic data;
the control module is used for outputting a driving signal to the driving module;
the driving module is used for driving the motor according to the driving signal;
the current detection module is used for acquiring current information of the motor;
the control module is configured to determine torque information for the motor based on the output characteristic data and the current information.
Optionally, the output characteristic data includes a corresponding relationship between an operating current and an output torque at a characteristic voltage and a characteristic rotation speed;
the control module is used for determining torque information of the motor according to preset voltage, preset rotating speed, the current information and the corresponding relation.
Optionally, the driving module comprises a motor driving component and a current control component connected with the motor driving component; the motor driving assembly is connected with the motor and the control module;
the motor driving assembly is used for controlling the upper limit value of the working current of the motor according to the current control assembly.
Optionally, the current control assembly comprises a plurality of current control loops connected in parallel with each other, and a first circuit switch;
the first circuit switch is used for controlling the conducting state of the current control loop;
the current control component is used for working a current control signal according to the conducting state of the current control loop;
and the motor driving component is used for determining the upper limit value of the working current of the motor according to the current control signal.
Optionally, the driving module further comprises a driving mode control component connected with the motor driving component;
the drive mode control assembly is used for controlling the step angle of the motor.
Optionally, the driving mode control assembly includes a plurality of mode control loops connected in parallel with each other, and a second circuit switch;
the second circuit switch is used for controlling the conduction state of the mode control loop;
the driving mode control component is used for outputting a mode control signal according to the conduction state of the mode control loop;
the drive mode control component is configured to determine a step angle of the motor in accordance with the mode control signal.
Optionally, the current detection module includes a current detection chip, and the current detection chip has a chip internal resistance and an amplification factor;
the current detection chip is used for outputting detection information;
the control module is used for determining the current detection range of the current detection chip based on the chip internal resistance, the amplification factor and the detection information.
Optionally, the device further comprises a filtering module connected with the current detection module and the control module;
the filtering module is used for filtering the electric information received from the current detection module and then sending the electric information to the control module;
the control module is used for generating current information based on the filtered electrical information.
Optionally, the motor drive assembly comprises at least one of a unipolar stepper motor drive assembly and a bipolar stepper motor drive assembly.
The embodiment of the utility model also discloses detection equipment, which comprises the detection circuit.
The utility model has the following advantages:
according to the embodiment of the utility model, the control module can determine the torque information corresponding to the current information in the output characteristic data based on the collected current information, so that the current torque information of the motor can be measured. In the embodiment of the utility model, the output characteristic data matched with the motor is determined in advance, and the output characteristic data comprises the corresponding relation between the current and the torque of the motor when the motor works, so that when the motor is controlled to work by adopting the control module and the driving module in the detection circuit, the control module can determine the current torque information of the motor based on the current information of the motor and the output characteristic data sent by the current acquisition module.
Drawings
FIG. 1 is a block diagram of a detection circuit according to the present invention;
FIG. 2 is a block diagram of another detection circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a current control module according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a driving mode control module according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a current detection chip according to an embodiment of the present invention;
fig. 6 is a schematic diagram of an output characteristic curve according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1, a block diagram of a detection circuit according to the present invention is shown, which may specifically include: the device comprises a control module 101, a driving module 102 and a current detection module 103; the driving module 102 is connected to the control module 101, and the current detection module 103 is connected to the control module 101 and the driving module 102; the driving module 102 is used for connecting with a motor 104 to be detected; the control module 101 records output characteristic data;
the control module 101 is configured to output a driving signal to the driving module 102;
the driving module 102 is configured to drive the motor 104 according to the driving signal;
the current detection module 103 is configured to acquire current information of the motor 104;
the control module 101 is configured to determine torque information of the motor 104 based on the output characteristic data and the current information.
The control module 101 may include an MCU (micro controller Unit), and the control module 101 may be used for calculating, storing, transmitting, converting, and the like of data.
External devices may be employed, for example: the dynamometer determines output characteristic data of the motor 104, which includes a corresponding relationship between a current when the motor 104 operates and an output torque (i.e., a load torque) thereof.
The control module 101 may generate an output drive signal that is sent to the drive module 102, and the drive module 102 controls the motor 104 accordingly with the output drive signal, for example: work, stop, and one or more operating parameters while working, such as: the operating parameters may include operating time, rotational speed, etc.
The current detection module 103 may collect current information of the motor 104, i.e., an operating current. And sends the current information to the control module 101 so that the control module 101 can obtain the current information of the motor 104 in real time.
In the embodiment of the present invention, the control module 101 may determine torque information corresponding to the current information in the output characteristic data based on the collected current information, so as to measure the current torque information of the motor 104. In the embodiment of the present invention, by determining output characteristic data matched with the motor 104 in advance, the output characteristic data includes a corresponding relationship between a current when the motor 104 operates and a torque thereof, so that when the motor 104 is controlled to operate by the control module 101 and the driving module 102 in the detection circuit, the control module 101 can determine current torque information of the motor 104 based on the current information of the motor 104 and the output characteristic data sent by the current collection module.
In an optional embodiment of the utility model, the output characteristic data comprises a correspondence of operating current to output torque at a characteristic voltage and a characteristic rotational speed;
the control module 101 is configured to determine torque information of the motor 104 according to a preset voltage, a preset rotation speed, the current information, and the corresponding relationship.
The specific principle is as follows:
the coil resistance of the motor 104 is R, the applied voltage is V, the working current is I, the induced electromotive force generated is E, the load torque is T (i.e., the output torque), and the rotation speed of the motor 104 is n revolutions per second, then:
the voltage equation for the motor 104 is:
V＝RI+E<1>
<1> two sides of formula are multiplied by I at the same time to obtain:
VI＝RI2+EI<2>
<2> formula left side VI is input power, and equation right RI2 is coil heating power (copper loss), ignores the magnet steel iron loss of motor 104 here, and the input power of motor 104 is copper loss + output power, and EI converts into mechanical energy output, and the structural load that we equipment motor 104 dragged promptly, and the mechanical energy of output is power:
P＝2πnT<6>
power and speed, Fv <3>
Torque arm T Fr <4>
Carrying <3> in <4>, <5> to obtain P-2 pi nT;
then EI is 2 pi nT <7>
Handle<2>Bringing in<7>To obtain: VI-RI2＝2πnT<8>；
By<8>The following can be obtained: t ═ VI-RI2)/2πn；
R is a known parameter of the motor 104, and the torque information of the motor 104 can be calculated according to the measured current information at a fixed voltage and a fixed rotation speed, so that the corresponding relationship between the operating current and the output torque at the characteristic voltage and the characteristic rotation speed can be obtained, and further, corresponding output characteristic data can be generated.
When the control module 101 obtains the preset voltage and the preset rotation speed of the motor 104, the torque information of the motor 104 may be determined based on the current information collected by the current detection module 103.
In an alternative embodiment of the present invention, the driving module 102 includes a motor driving component and a current control component connected to the motor driving component; the motor driving assembly is connected with the motor 104 and the control module 101;
the motor driving component is configured to control an upper limit value of the working current of the motor 104 according to the current control component.
The driving module 102 is provided with a motor driving component and a current control component, and the motor driving component controls the motor 104 accordingly based on the driving signal output by the control module 101.
The current control assembly is used for limiting the maximum current value of the motor 104 during operation, so that multi-gear operating current control is provided for the motor 104, current information of the motor 104 is collected when the motor 104 is at different operating current upper limit values, and accuracy of data detection is provided.
In an alternative embodiment of the present invention, the motor drive assembly includes at least one of a unipolar stepper motor drive assembly 1021 and a bipolar stepper motor drive assembly 1022.
Referring to fig. 2, which shows a block diagram of another detection circuit provided by the embodiment of the present invention, the motor driving assembly may include a unipolar stepping motor driving assembly 1021 and a bipolar stepping motor driving assembly 1022.
In an alternative embodiment of the present invention, the current control assembly includes a plurality of current control loops connected in parallel with each other, and a first circuit switch;
the first circuit switch is used for controlling the conducting state of the current control loop;
the current control component is used for working a current control signal according to the conducting state of the current control loop;
the motor driving component is configured to determine an upper limit value of the operating current of the motor 104 according to the current control signal.
Referring to fig. 3, a schematic diagram of a current control assembly circuit structure according to an embodiment of the present invention is shown.
Taking the bipolar stepping motor driving component 1022 as an example, the conducting state of each current control loop is determined according to the state of each sub-switch in the first circuit switch SW11, where the current control loop is a circuit branch where each sub-switch is located, and the sub-switches include S1 (two ends of the sub-switch S1 are respectively 1 pin and 8 pins), S2 (two ends of the sub-switch S2 are respectively 2 pin and 7 pin), S3 (two ends of the sub-switch S3 are respectively 3 pin and 6 pin), S4 (two ends of the sub-switch S4 are respectively 4 pin and 5 pin).
As shown in table 2, based on the on states of S1, S2, S3, S4, a corresponding operating current control signal (voltage of REF pin) can be obtained, as shown in table 2, the bipolar stepping motor driving component 1022 controls the operating current upper limit value of the motor 104 according to the current control signal, wherein when S4 is on, TQ is 0, i.e., low level; when S4 is turned off, TQ is 1, i.e., high.
TABLE 2 relationship table between conduction state of current control assembly and upper limit value of working current
In an optional embodiment of the present invention, the driving module 102 further comprises a driving mode control component connected to the motor driving component;
the drive mode control assembly is used to control the pitch angle of the motor 104.
The rotation speed 1PRM of the motor 104 is 1/60 (360/step angle) PPS, where PRM is the number of Revolutions Per Minute (rotations Per Minute) and PPS is the number of Pulses Per Second (Pulses Per Second), and the rotation speed of the motor 104 can be controlled by controlling the step angle of the motor 104.
In an alternative embodiment of the present invention, the driving mode control assembly includes a plurality of mode control loops connected in parallel with each other, and a second circuit switch;
the second circuit switch is used for controlling the conduction state of the mode control loop;
the driving mode control component is used for outputting a mode control signal according to the conduction state of the mode control loop;
the drive mode control assembly is configured to determine a step angle of the motor 104 in accordance with the mode control signal.
Referring to fig. 4, a schematic diagram of a circuit structure of a driving mode control assembly according to an embodiment of the present invention is shown.
Taking the bipolar stepping motor driving component 1022 as an example, determining the conducting state of each mode control loop according to the state of each sub-switch in the second circuit switch S12, wherein the mode control loop is a circuit branch where each sub-switch is located, the sub-switches include S5 (two ends of the sub-switch S5 are respectively 1 pin and 8 pins), S6 (two ends of the sub-switch S6 are respectively 2 pin and 7 pin), S7 (two ends of the sub-switch S7 are respectively 3 pin and 6 pin), S8 (two ends of the sub-switch S8 are respectively 4 pin and 5 pin), based on the conducting state of each sub-switch, the level states of an ENABLE terminal (ENABLE terminal), an M1 terminal, an M2 terminal and an M3 terminal in the driving mode control component can be determined (wherein M1, M2 and M3 are different pins for receiving the mode control signal in the control module), and specifically, when the ENABLE terminal S5 is on, the ble terminal is at a low level; when and only when S6 is turned on, the M1 terminal is at low level; when and only when S7 is turned on, the M2 terminal is at low level; if and only if S8 is turned on, the M3 terminal is low. And outputting the mode control signal according to the level states of the ENABLE end, the M1 end, the M2 end and the M3 end, wherein whether the motor outputs or not is controlled through the level state of the ENABLE end, and the motor is controlled to be in a closing state if and only if the ENABLE end is in a low level. As shown in table 3, the driving mode control component is configured to determine a driving mode according to the mode control signal (where L is low, H is high, and X is any level), and further determine the step angle of the motor 104.
| Mode(s) | ENABLE | M1 | M2 | M3 | |
| Output shutdown | L | X | X | X | |
| First step mode | H | L | L | L | |
| Second step mode | H | H | | L | |
| First | |||||
| 2 subdivision mode | H | L | | L | |
| Second | |||||
| 2 subdivision mode | H | | H | L | |
| 4 subdivision into | H | | L | H | |
| 8 subdivision | H | H | L | H | |
| 16 subdivision | H | L | H | H | |
| Sleep mode | H | H | H | H |
TABLE 2 relation table of level state and driving mode of driving mode control assembly
In an optional embodiment of the present invention, the current detection module 103 includes a current detection chip, and the current detection chip has a chip internal resistance and an amplification factor;
the current detection chip is used for outputting detection information;
the control module 101 is configured to determine a current detection range of the current detection chip based on the chip internal resistance, the amplification factor, and the detection information.
Referring to fig. 5, which is a schematic diagram illustrating a connection of a current detection chip according to an embodiment of the present invention, an OUT (output) terminal of the current detection chip is configured to output detection information and send the detection information to a control module, an ADC (analog-to-Digital Conversion) terminal of the control module 101 receives the detection information, and the control module 101 determines a current detection range of the current detection chip based on a voltage range of the detection information received by the ADC terminal, a chip internal resistance and an amplification factor of the current detection chip.
Further, the control module 101 may determine current information before the motor point according to a current voltage value of the detection information output by the current detection chip.
In an optional embodiment of the present invention, the embodiment of the present invention may further include a filtering module connected to the current detection module 103 and the control module 101;
the filtering module is configured to filter the electrical information received from the current detection module 103 and send the filtered electrical information to the control module 101;
the control module 101 is configured to generate current information based on the filtered electrical information.
The filtering module can filter the detection information output by the current detection module 103, and obtain the smooth current information from the transient current information.
The control module 101 may obtain torque information of the motor 104 according to the obtained filtered current information according to a preset voltage and a preset rotation speed.
For example: as shown in table 1, the output characteristic data may be torque information corresponding to each current information when the rotation speed is 459RPM (revolutions per minute) under the rated voltage of the motor 104.
TABLE 1 table of correspondence between current information and torque information
Referring to fig. 6, a schematic diagram of an output characteristic curve provided by the embodiment of the utility model is shown. Further, as shown in fig. 6, a characteristic curve of the current information and the torque information may be obtained based on the torque information corresponding to the obtained current information.
The embodiment of the utility model also discloses detection equipment, which comprises the detection circuit.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The above detailed description of the detection circuit and the detection device provided by the present invention, and the specific examples applied herein have been provided to explain the principles and embodiments of the present invention, and the above descriptions of the embodiments are only used to help understand the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A detection circuit, comprising: the device comprises a control module, a driving module and a current detection module; the driving module is connected with the control module, and the current detection module is connected with the control module and the driving module; the driving module is used for being connected with a motor to be detected; the control module records output characteristic data;
the control module is used for outputting a driving signal to the driving module;
the driving module is used for driving the motor according to the driving signal;
the current detection module is used for acquiring current information of the motor;
the control module is configured to determine torque information for the motor based on the output characteristic data and the current information.
2. The circuit of claim 1, wherein the output characteristic data includes a correspondence of operating current to output torque at a characteristic voltage and a characteristic rotational speed;
the control module is used for determining torque information of the motor according to preset voltage, preset rotating speed, the current information and the corresponding relation.
3. The circuit of claim 1 or 2, wherein the driving module comprises a motor driving component and a current control component connected with the motor driving component; the motor driving assembly is connected with the motor and the control module;
the motor driving assembly is used for controlling the upper limit value of the working current of the motor according to the current control assembly.
4. The circuit of claim 3,
the current control assembly comprises a plurality of current control loops connected in parallel and a first circuit switch;
the first circuit switch is used for controlling the conducting state of the current control loop;
the current control component is used for working a current control signal according to the conducting state of the current control loop;
and the motor driving component is used for determining the upper limit value of the working current of the motor according to the current control signal.
5. The circuit of claim 4, wherein the drive module further comprises a drive mode control component coupled to the motor drive component;
the drive mode control assembly is used for controlling the step angle of the motor.
6. The circuit of claim 5,
the driving mode control assembly comprises a plurality of mode control loops connected in parallel and a second circuit switch;
the second circuit switch is used for controlling the conduction state of the mode control loop;
the driving mode control component is used for outputting a mode control signal according to the conduction state of the mode control loop;
the drive mode control component is configured to determine a step angle of the motor in accordance with the mode control signal.
7. The circuit of claim 1,
the current detection module comprises a current detection chip, and the current detection chip is provided with chip internal resistance and an amplification factor;
the current detection chip is used for outputting detection information;
the control module is used for determining the current detection range of the current detection chip based on the chip internal resistance, the amplification factor and the detection information.
8. The circuit of claim 1, further comprising a filtering module connected to the current detection module and the control module;
the filtering module is used for filtering the electric information received from the current detection module and then sending the electric information to the control module;
the control module is used for generating current information based on the filtered electrical information.
9. The circuit of claim 2, wherein the motor drive assembly comprises at least one of a unipolar stepper motor drive assembly and a bipolar stepper motor drive assembly.
10. A detection device, characterized in that the device comprises a detection circuit according to any of claims 1-9.
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| CN202120697981.5U CN215984964U (en) | 2021-04-06 | 2021-04-06 | Detection circuit and detection equipment |
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| CN202120697981.5U CN215984964U (en) | 2021-04-06 | 2021-04-06 | Detection circuit and detection equipment |
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