The invention discloses a fault detection method and fault detection device for a direct-current motor drive and control circuit. The fault detection method for the direct-current motor drive and control circuit comprises the steps of sampling state information of the direct-current motor drive and control circuit, judging fault types of the direct-current motor drive and control circuit according to the state information, generating corresponding fault alarm signals according to the fault types and the preset conditions, and sending out corresponding alarm prompts according to the fault alarm signals. According to the fault detection method and fault detection device for the direct-current motor drive and control circuit, users can locate fault parts and analyze fault causes fast and conveniently in the processes of hardware development, production process and after-sale repair and the like of the direct-current motor drive and control circuit, analysis difficulty of fault problems in development and production is greatly lowered, the efficiency of dealing with the after-sale service problems is effectively improved, and the method and the device are low in cost, safe and reliable.

Fault detection method and fault detection device for direct-current motor drive and control circuit

The invention provides a control method for a motor driving a shield door and provided with a position sensor. The control method comprises the steps that a, when the motor drives the shield door, a digital signal processor carries out speed closed-loop PID control over the motor; b, if the digital processor can not obtain a position change signal detected by the position sensor, the digital signal processor compares currents of the motor with a preset threshold value, and when the currents are larger than the set threshold value, the motor is controlled to stop rotating or reversely rotate to an initial state; when the currents are not larger than the set threshold value, then whether the digital signal processor has already recorded a time and duty ratio curve of the whole door opening and closing process is judged, if no, the motor is controlled to rotate at a constant speed, and if yes, according to the recorded time and duty ratio curve, the motor is controlled according to a door opening and closing speed curve. According to the control method, when the position sensor in the motor fails, the motor can still be controlled safely to drive the shield door to be opened or closed normally.

Control method for motor driving shield door and provided with position sensor

Precise positioning system of industrial sewing machine and working method of precise positioning system

The invention discloses a permanent magnet brushless motor sensorless starting method. The permanent magnet brushless motor sensorless starting method comprises the steps that firstly, a rotor is positioned at a specific position through a rotor prepositioning device, single-step acceleration is carried out according to the given single-step acceleration current and single-step acceleration time obtained by calculation, single-step acceleration is directly switched to closed loop acceleration after being carried out, rotor position signals in a three-phase suspended state are detected every fixed period, the power-on phase sequence is determined according to the rotor position signals, whether counter potential signals are stable or not is judged through a signal comparison method while closed loop acceleration is carried out, and when stable counter potential signals can be detected within one phase conversion period, a normal counter potential method is switched to for operation, wherein the single-step acceleration and the signal comparison method can ensure that a motor is started at the highest speed, and the closed loop acceleration process can ensure that the motor supplies power accurately in the acceleration start process and step-out is avoided. By means of the method, an efficient permanent magnet brushless motor can be started accurately, rapidly and efficiently, the optimization process is simple, universality is high, the success rate of starting can be improved greatly, no sensitivity to load changes exists, and the start program does not need to be changed when loads and the working station change within a certain range.

Permanent magnet brushless motor sensorless starting method

The invention discloses a motor driving control system The system comprises a DC-DC converter control part and an inverter control part, wherein the inverter control part comprises a speed controller, a current controller and an inverter pulse width modulator (PWM) which are sequentially connected, the inverter control part also comprises a switching frequency calculation module, the switching frequency calculation module is used for calculating switching frequency information transmitted to the inverter PWM, the inverter PWM is used for outputting a PWM signal for controlling an inverter, and the DC-DC converter control part comprises a DC voltage calculation module and a DC voltage controller which are sequentially connected According to the motor driving control system disclosed by the invention, the switching loss at a low speed is one fourth of that of the traditional system, other power loss of the system is basically kept unchanged, and the total loss of the system can be reduced by 20-40% after the switching loss is added to the other power loss

Motor driving control system and control method thereof

A position sensor-free double closed-loop speed regulation control method for a brushless DC motor comprises the following steps: (1) initializing functional modules and peripherals; (2) opening AD (Analog-Digital) interruption and protection interruption; (3) detecting the start key of the motor, judging whether to start the motor, if yes, executing the next step, and if not, continuing to execute the step; (4) starting voltage detection, judging whether the voltage of a main circuit is larger than starting voltage, if yes, executing the next step, and if not, returning to the step (3); (5) entering a motor starting subprogram and beginning operating the motor; (6) entering a double closed-loop speed regulation subprogram, and regulating the rotational speed and the current of the motor according to voltage value; and (7) detecting a motor brake key, judging whether to press the key, if yes, entering a motor brake subprogram, and if not, returning to the step (3). The method provided by the invention overcomes the defects of larger size, low rotational speed accuracy and the like of the conventional motor controller, can accurately control different rotational speeds of the motor, and can simultaneously realize counter electromotive force zero-cross comparison position sensor-free reversing and Hall position signal reversing.

Position sensor-free double closed-loop speed regulation control method for brushless DC motor

A TMS320F2812 based speed regulation controller of a brushless DC motor includes a brushless DC motor regulation controller of the brushless DC motor and a power supply used for providing power supply for a central processing unit and a signal conditioning circuit, wherein the brushless DC motor regulation controller is jointly formed by a central processing unit serving as a control panel, a signal conditioning circuit serving as a conditioning board and a three-phase inverter bridge module serving as a driving board, which are connected through sensors and a bridge rectification and filtering circuit and are connected from the upper layer to the lower layer sequentially through contact pins, wherein the sensors are the current sensor and the voltage sensor connected to the central processing unit respectively. According to the invention, the design manner of a layered circuit that the controller is divided in three circuit boards from top to bottom is adopted, namely the lower layer is the main circuit inversion module driving board, the middle layer is the signal conditioning board, and the upper layer is the core control panel; the structure is simple and easy, the reliability is high, the replacement is easy, and the generality is stronger; and the TMS320F2812 based speed regulation controller can realize the counter electromotive force zero passage balancing un-position sensor steering and the Hall position signal steering simultaneously.

TMS320F2812 based speed regulation controller of brushless DC motor

Popular Tasks used by Researchers

How can I help with your research?

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

We encountered an error while loading the panel. Please try refreshing the page.

Something went wrong

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

Anyone with the link can view this chat. You can switch it back to private anytime.

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

Wu Aiguo

Author Tools

Chat about Author

Papers

Position sensor-free double closed-loop speed regulation control method for brushless DC motor

TMS320F2812 based speed regulation controller of brushless DC motor