CN220527831U - Control circuit of stepping motor in particle counter - Google Patents
Control circuit of stepping motor in particle counter Download PDFInfo
- Publication number
- CN220527831U CN220527831U CN202321628458.2U CN202321628458U CN220527831U CN 220527831 U CN220527831 U CN 220527831U CN 202321628458 U CN202321628458 U CN 202321628458U CN 220527831 U CN220527831 U CN 220527831U
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- circuit
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- motor driving
- particle counter
- driving circuit
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- 239000002245 particle Substances 0.000 title claims abstract description 23
- 238000002955 isolation Methods 0.000 claims abstract description 14
- 238000001514 detection method Methods 0.000 claims description 9
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- 230000003287 optical effect Effects 0.000 abstract description 8
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 8
- 239000003921 oil Substances 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000013618 particulate matter Substances 0.000 description 3
- 239000010720 hydraulic oil Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000010723 turbine oil Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012208 gear oil Substances 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The utility model discloses a stepping motor control circuit in a particle counter, and belongs to the technical field of motor control. The utility model comprises a power module, an MCU circuit, a motor driving circuit, an optical coupling isolation circuit and an input port. The power module is electrically connected with the MCU circuit and the motor driving circuit and supplies power for the MCU circuit and the motor driving circuit, and supports 12-50 VDC input to drive various types of stepping motors; the input port is connected with the motor driving circuit through the optocoupler isolation circuit, and sends external enabling, direction and pulse control signals to the motor driving circuit, and the motor driving circuit is connected with the stepping motor and drives the stepping motor to operate. The utility model adopts the optocoupler isolation circuit to realize accurate anti-interference input of external input signals, ensures the stability of the control circuit, adopts the driving chip supporting 256 micro steps to improve the smoothness of the micro steps, adopts the power supply module supporting wide voltage input, and can drive various stepping motors.
Description
Technical Field
The utility model belongs to the technical field of motor control, and particularly relates to a stepping motor control circuit in a particle counter.
Background
The liquid particle counter is used for detecting the size and the quantity of various particles in the oil liquid and detecting the pollution degree of solid particles on various oil liquids. As shown in fig. 1, the particle counter disclosed in chinese patent No. CN213933521U performs oil pollution level detection by adopting a shading method principle, has the advantages of high detection speed, strong anti-interference, high precision, good repeatability and the like, can be used for online real-time monitoring of particle pollution in oil paths of hydraulic systems, and can be widely applied to solid particle pollution level detection of hydraulic oil, lubricating oil, transformer oil (insulating oil), turbine oil (turbine oil), gear oil, engine oil, aviation kerosene, water-based hydraulic oil and the like in the fields of aviation, aerospace, electric power, petroleum, chemical industry, transportation, harbor, metallurgy, machine, automobile manufacturing and the like, and also has the following disadvantages when in use: the design of a pressure reducing valve and a flow valve is adopted, the read flow value is inaccurate, and factors such as bubbles are generated to influence the measurement accuracy; the whole volume is large and the use is inconvenient. The existing partial particle counter adopts a motor to control the flow rate of liquid to be measured, but the motor vibrates due to poor anti-interference performance of a circuit in the use process, so that the measured liquid volume in unit time is not accurate enough, and the final result precision is not enough.
For this purpose, a control circuit for a stepping motor in a particle counter is proposed to solve the above-mentioned problems.
Disclosure of Invention
The utility model aims to provide a stepping motor control circuit in a particle counter, which aims to solve the problems that in the prior art, the flow accuracy measured in unit time is insufficient due to interference, vibration and the like of the existing liquid particle counter, and the unit accuracy of particle pollution degree data of unit oil is affected. In order to achieve the purpose, the utility model adopts the following technical scheme: a stepping motor control circuit in a particle counter comprises a power supply module, an MCU circuit, a motor driving circuit, an optical coupling isolation circuit and an input port. The power supply module is electrically connected with the MCU circuit and the motor driving circuit and supplies power for the MCU circuit and the motor driving circuit; the input port is connected with the motor driving circuit through the optocoupler isolation circuit and sends a control signal to the motor driving circuit, and the motor driving circuit is connected with the stepping motor and drives the stepping motor to operate. According to the technical method, an externally input signal passes through the optical coupler isolation circuit, so that the integral anti-interference capability is effectively improved, the motor is controlled with high precision, and the problem of inaccurate flow precision in unit time of liquid particle counting is solved.
Furthermore, the power supply module adopts an MP2459 single-chip buck switch converter, and a cycle-by-cycle current-limiting protection and over-temperature protection circuit is integrated inside. The monolithic buck switching converter supports a wide voltage input power supply: the peak current of the motor is up to 5A and the motor is suitable for various stepping motors with 12-50 VDC.
Further, the MCU circuit comprises a microprocessor, a reset circuit electrically connected with the microprocessor, a crystal oscillator circuit and an interface circuit. The model of the microprocessor is STM32F103CBT6, a high-performance RISC core with 72MHz running frequency and a high-speed embedded memory are integrated, and the stability of the whole control system is improved by adopting the high-speed embedded memory to independently control a driving chip.
More preferably, the motor driving circuit adopts a driving chip with the model of TMC2590, supports 256 micro-steps, improves the smoothness of the micro-steps, integrates short circuit protection, open circuit load detection, temperature sensor and undervoltage detection, and does not need to additionally build a protection circuit.
Specifically, the enabling, direction and pulse signals of the input port are electrically connected with the optical coupler isolation circuit, so that the anti-interference capability and the reliability of the system are improved.
A chopping algorithm is arranged in the microprocessor of the MCU circuit, so that vibration and noise in the operation of the motor can be reduced. The control circuit is also provided with a half-current mode, namely when the stepping motor works normally, the input control pulse PUL is disconnected, the motor is in an emergency stop state, the current of the internal coil is maximum at the moment, and then the heating of the motor coil is increased, so that the service life of the motor is influenced. The half-current mode is to enter a half-current state after the pulse signal PUL is disconnected for 0.5 seconds, and the phase current of the motor is 50% of that of the motor during operation, so that the power consumption and the heating of the motor are reduced, and the motor is automatically withdrawn from the half-current state after receiving the pulse signal again.
Compared with the prior art, the utility model mainly adopts the optocoupler isolation circuit to realize accurate anti-interference input of external input signals, ensures the stability of the control circuit and further controls the stepping motor with high precision; meanwhile, the driving chip supporting 256 micro-steps is adopted to improve the smoothness of the micro-steps, and the power module supporting wide voltage input is adopted to drive various stepping motors so as to realize high-precision extraction of oil liquid by the particle counter.
Drawings
FIG. 1 is a schematic diagram of the Chinese utility model patent CN 213933521U;
FIG. 2 is a circuit diagram provided by an embodiment of the present utility model;
fig. 3 is a schematic block diagram provided by an embodiment of the present utility model.
Detailed Description
In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the utility model. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
The technical scheme of the patent is further described in detail below with reference to the specific embodiments.
As shown in fig. 2 and 3, the present utility model provides a control circuit for a stepping motor in a particle counter, which comprises a power module, an MCU circuit, a motor driving circuit, an optocoupler isolation circuit and an input port. The power supply module is electrically connected with the MCU circuit and the motor driving circuit and supplies power for the MCU circuit and the motor driving circuit; the input port is connected with the motor driving circuit through the optocoupler isolation circuit and sends a control signal to the motor driving circuit, and the motor driving circuit is connected with the stepping motor and drives the stepping motor to operate. The power supply module adopts an MP2459 single-chip buck switch converter, and a cycle-by-cycle current-limiting protection and over-temperature protection circuit is integrated inside. The monolithic buck switching converter supports a wide voltage input power supply: the peak current of the motor is up to 5A and the motor is suitable for various stepping motors with 12-50 VDC. The MCU circuit comprises a microprocessor, a reset circuit electrically connected with the microprocessor, a crystal oscillator circuit and an interface circuit. The model of the microprocessor is STM32F103CBT6, a high-performance RISC core with 72MHz running frequency and a high-speed embedded memory are integrated, and the stability of the whole control system is improved by adopting the high-speed embedded memory to independently control a driving chip. The motor driving circuit adopts a driving chip with the model of TMC2590, supports 256 micro-steps, improves the smoothness of the micro-steps, integrates short-circuit protection, open-circuit load detection, temperature sensor and undervoltage detection, and does not need to additionally build a protection circuit. The enabling, direction and pulse signals of the input port are electrically connected with the optical coupler isolation circuit, so that the anti-interference capability and the reliability of the system are improved.
The stepping motor control circuit is connected with a power supply, a stepping motor and a control input key, corresponding enabling signals, directions and pulse signals are input through the key, as shown in fig. 2, the pulse signals are connected with a 6N137 optical coupler and then input into a driving chip with the model of TMC2590, enabling signals and direction signals are connected with a GX817C optical coupler and then input into the driving chip, and the driving chip drives the stepping motor to operate. And the signals input from the outside are transmitted through the optical coupler isolation circuit, so that the integral anti-interference capability is effectively improved, and the motor is controlled with high precision. A chopping algorithm is arranged in the microprocessor of the MCU circuit, so that vibration and noise in the operation of the motor can be reduced. The control circuit is also provided with a half-current mode, namely when the stepping motor works normally, the input control pulse PUL is disconnected, the motor is in an emergency stop state, the current of the internal coil is maximum at the moment, and then the heating of the motor coil is increased, so that the service life of the motor is influenced. The half-current mode is to enter a half-current state after the pulse signal PUL is disconnected for 0.5 seconds, and the phase current of the motor is 50% of that of the motor during operation, so that the power consumption and the heating of the motor are reduced, and the motor is automatically withdrawn from the half-current state after receiving the pulse signal again.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The above embodiments are only for illustrating the present utility model, not for limiting the present utility model, and various changes and modifications may be made by one of ordinary skill in the relevant art without departing from the spirit and scope of the present utility model, and therefore, all equivalent technical solutions are also within the scope of the present utility model, and the scope of the present utility model is defined by the claims.
Claims (7)
1. A stepper motor control circuit in a particle counter, characterized by: the power supply module is electrically connected with the MCU circuit and the motor driving circuit to supply power for the MCU circuit and the motor driving circuit; the input port is connected with the motor driving circuit through the optocoupler isolation circuit and sends a control signal to the motor driving circuit, and the motor driving circuit is connected with the stepping motor and drives the stepping motor to operate.
2. A stepper motor control circuit in a particle counter as defined in claim 1, wherein: the power supply module adopts an MP2459 single-chip buck switch converter, and a cycle-by-cycle current-limiting protection and over-temperature protection circuit is integrated inside.
3. A stepper motor control circuit in a particle counter as defined in claim 1, wherein: the MCU circuit comprises a microprocessor, a reset circuit electrically connected with the microprocessor, a crystal oscillator circuit and an interface circuit.
4. A stepper motor control circuit in a particle counter as defined in claim 3, wherein: the model of the microprocessor is STM32F103CBT6.
5. A stepper motor control circuit in a particle counter as defined in claim 1, wherein: the motor driving circuit adopts a driving chip with the model of TMC2590, supports 256 micro-steps, and integrates short-circuit protection, open-circuit load detection, temperature sensor and undervoltage detection.
6. A stepper motor control circuit in a particle counter as defined in claim 1, wherein: the enabling, direction and pulse signals of the input port are electrically connected with the optocoupler isolation circuit.
7. A control circuit for a stepper motor in a particle counter according to any one of claims 1 to 6, wherein: a chopping algorithm is arranged in the microprocessor of the MCU circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321628458.2U CN220527831U (en) | 2023-06-26 | 2023-06-26 | Control circuit of stepping motor in particle counter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321628458.2U CN220527831U (en) | 2023-06-26 | 2023-06-26 | Control circuit of stepping motor in particle counter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220527831U true CN220527831U (en) | 2024-02-23 |
Family
ID=89935242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321628458.2U Active CN220527831U (en) | 2023-06-26 | 2023-06-26 | Control circuit of stepping motor in particle counter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220527831U (en) |
-
2023
- 2023-06-26 CN CN202321628458.2U patent/CN220527831U/en active Active
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