CN215231215U - Breathing machine monitored control system - Google Patents
Breathing machine monitored control system Download PDFInfo
- Publication number
- CN215231215U CN215231215U CN202023308626.9U CN202023308626U CN215231215U CN 215231215 U CN215231215 U CN 215231215U CN 202023308626 U CN202023308626 U CN 202023308626U CN 215231215 U CN215231215 U CN 215231215U
- Authority
- CN
- China
- Prior art keywords
- submodule
- module
- direct current
- current motor
- brushless direct
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000029058 respiratory gaseous exchange Effects 0.000 title claims abstract description 30
- 238000001514 detection method Methods 0.000 claims abstract description 69
- 238000005265 energy consumption Methods 0.000 claims abstract description 11
- 230000003750 conditioning effect Effects 0.000 claims description 13
- 238000005070 sampling Methods 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 8
- 230000003993 interaction Effects 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 230000003321 amplification Effects 0.000 abstract description 2
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 6
- 238000004590 computer program Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 210000001331 nose Anatomy 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 210000003928 nasal cavity Anatomy 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 201000002859 sleep apnea Diseases 0.000 description 1
- 230000003860 sleep quality Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The utility model discloses a breathing machine monitored control system, set up pressure detection module and pressure differential detection module, the pressure and the pressure differential of real-time supervision gas circuit, be convenient for monitor the integrity of breathing machine gas circuit, set up brushless DC motor control module, detect brushless DC motor's operating voltage and operating temperature, and carry out the position detection to the rotor, set up power drive submodule piece, a drive signal for carrying out power amplification with brushless DC motor controller submodule piece, drive three-phase full-bridge contravariant submodule piece's commutation switches on, and then drive brushless DC motor open and stop, still set up energy consumption braking submodule piece, stop rotating brushless DC motor in-process rotor because the energy conversion that inertia produced is heat energy, the setting of above-mentioned each module, for the stability of maintaining breathing machine work, comfort level for improving the user provides hardware support.
Description
Technical Field
The utility model relates to a breathing machine technical field, concretely relates to breathing machine monitored control system.
Background
Sleep apnea sufferers mostly need to improve the sleep quality by means of a breathing machine. The breathing machine is a device for assisting the human body to ventilate, and mainly comprises a control circuit, a motor, a fan, an air passage, a corrugated pipe and a mask, wherein the control circuit is used for controlling the starting and stopping of the fan of the breathing machine, the on-off and the flow of the air passage and the like. The ventilator uses the airflow generated by the rotation of the fan as an air source, and the control circuit controls the pressure and the flow of ventilation, so that the airflow enters the corrugated pipe through the air passage and then enters the nasal cavity of a user through the mask.
The existing breathing machine has the problems of dynamic change of air flow and instant discomfort caused by stopping using in actual use, namely, the condition that the air flow in an air path is easy to be unstable, and the condition that the mechanical property is quickly reduced easily occurs in the instant that a fan stops generating air flow, so that the two conditions lead to poor working stability and low comfort degree of the breathing machine.
SUMMERY OF THE UTILITY MODEL
The utility model provides a monitoring system of breathing machine provides hardware support for solving the problem that "poor stability, comfort level are low" that prior art exists.
The utility model provides a breathing machine monitored control system installs on outside breathing machine, outside suction machine mainly includes brushless DC motor, fan and gas circuit, wherein, outside breathing machine's brushless DC motor is including the rotor, be provided with the throttle plate in the gas circuit:
the system comprises a pressure detection module, a pressure difference detection module, a main controller module and a brushless direct current motor control module; the air passage of the external respirator is provided with a first pressure hole, a second pressure hole and a third pressure hole, the first pressure hole is arranged in the inflow direction of a throttle plate of the external respirator, the second pressure hole is arranged in the outflow direction of the throttle plate of the external respirator, the third pressure hole is arranged in the outflow direction of the second pressure hole, the differential pressure detection module is installed between the first pressure hole and the second pressure hole and is used for detecting the differential pressure of the air passage of the external respirator, and the output end of the differential pressure detection module is connected with the main controller module; the pressure detection module is arranged at a third pressure hole and is used for detecting the pressure of the air path of the external respirator, and the output end of the pressure detection module is connected with the main controller module; the brushless direct current motor control module mainly comprises a brushless direct current motor controller submodule, a voltage detection submodule, a temperature detection submodule, a position detection submodule, a power driving submodule, a three-phase full-bridge inversion submodule and an energy consumption braking submodule; the brushless direct current motor controller submodule is connected with the main controller module; the voltage detection submodule detects the working voltage of a brushless direct current motor of the external respirator in real time, and the output end of the voltage detection submodule is connected with the brushless direct current motor controller submodule; the temperature detection submodule detects the working temperature of a brushless direct current motor of the external respirator in real time, and the output end of the temperature detection submodule is connected with a brushless direct current motor controller submodule; the position detection submodule is arranged on a rotor of a brushless direct current motor of the external respirator, and the output end of the position detection submodule is connected with a brushless direct current motor controller submodule; the control end of the power driving submodule is connected with the brushless direct current motor controller submodule, and the output end of the power driving submodule is connected with the input end of the three-phase full-bridge inversion submodule; the three-phase full-bridge inversion sub-module drives a fan of the external respirator to operate; and the output end of the three-phase full-bridge inversion submodule is connected to the brushless direct current motor of the external respirator through the energy consumption braking submodule.
Further, the brushless direct current motor control module further comprises a current sampling sub-module, a signal conditioning sub-module and an overcurrent protection sub-module; the output end of the three-phase full-bridge inversion submodule is connected to the brushless direct current motor through the current sampling submodule, the signal conditioning submodule, the overcurrent protection submodule and the energy consumption braking submodule; and the output end of the signal conditioning submodule is also connected to the brushless direct current motor controller submodule.
Further, the system also comprises a fault alarm module; and the control end of the fault alarm module is connected with the main controller module.
Further, the system also comprises a human-computer interaction module; the man-machine interaction module is connected with the main controller module and provides a session interface for an external user.
Furthermore, the system also comprises a wireless communication module and a terminal control end; the wireless communication module is connected with the main controller module and the terminal control end.
Compared with the prior art, the method has the following characteristics:
the three pressure holes are arranged on the air path of the respirator, and the pressure detection module and the pressure difference detection module are correspondingly arranged for monitoring the pressure and the pressure difference of the air path in real time, so that the integrity of the air path of the respirator is convenient to monitor, detection data can be provided for maintaining the working stability of the respirator, and the reduction of the comfort level due to factors such as air path damage, insufficient flow and the like can be avoided; the control module of the brushless direct current motor is arranged to detect the working voltage and the working temperature of the brushless direct current motor and detect the position of the rotor, so that the working state of the brushless direct current motor can be conveniently monitored, the working stability of the respirator is maintained, and the reduction of the comfort level caused by the problems of overvoltage, undervoltage, high temperature and the like of the brushless direct current motor can be avoided; set up power drive submodule piece for carry out power amplification with brushless DC motor controller submodule piece's drive signal, drive three-phase full-bridge contravariant submodule piece's commutation switches on, and then drive opening of brushless DC motor stops to stop, and set up the dynamic braking submodule piece, stop the rotor of brushless DC motor rotation in-process because the energy conversion of inertia production is heat energy, make brushless DC motor's rotational speed descend rapidly and do not influence user's comfort level, both be convenient for maintain the stability of breathing machine work, can improve user's comfort level again.
Drawings
Fig. 1 is a schematic block diagram of the structure of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples, but the present invention is not limited to these examples.
A monitoring system of a breathing machine is installed on an external breathing machine, the external breathing machine mainly comprises a brushless direct current motor, a fan and a gas circuit, wherein the brushless direct current motor of the external breathing machine comprises a rotor and a pressure detection module, a pressure difference detection module, a main controller module and a brushless direct current motor control module; the air passage of the external respirator is provided with a first pressure hole, a second pressure hole and a third pressure hole, the first pressure hole is arranged in the inflow direction of a throttle plate of the external respirator, the second pressure hole is arranged in the outflow direction of the throttle plate of the external respirator, the third pressure hole is arranged in the outflow direction of the second pressure hole, the differential pressure detection module is installed between the first pressure hole and the second pressure hole and is used for detecting the differential pressure of the air passage of the external respirator, and the output end of the differential pressure detection module is connected with the main controller module; the pressure detection module is arranged at a third pressure hole and is used for detecting the pressure of the air path of the external respirator, and the output end of the pressure detection module is connected with the main controller module; the brushless direct current motor control module mainly comprises a brushless direct current motor controller submodule, a voltage detection submodule, a temperature detection submodule, a position detection submodule, a power driving submodule, a three-phase full-bridge inversion submodule and an energy consumption braking submodule; the brushless direct current motor controller submodule is connected with the main controller module; the voltage detection submodule detects the working voltage of a brushless direct current motor of the external respirator in real time, and the output end of the voltage detection submodule is connected with the brushless direct current motor controller submodule; the temperature detection submodule detects the working temperature of a brushless direct current motor of the external respirator in real time, and the output end of the temperature detection submodule is connected with a brushless direct current motor controller submodule; the position detection submodule is arranged on a rotor of a brushless direct current motor of the external respirator, and the output end of the position detection submodule is connected with a brushless direct current motor controller submodule; the control end of the power driving submodule is connected with the brushless direct current motor controller submodule, and the output end of the power driving submodule is connected with the input end of the three-phase full-bridge inversion submodule; the three-phase full-bridge inversion sub-module drives a fan of the external respirator to operate; and the output end of the three-phase full-bridge inversion submodule is connected to the brushless direct current motor of the external respirator through the energy consumption braking submodule.
The pressure difference detection module is a pressure difference sensor which detects the air flow in the air path by collecting the air flow pressure difference flowing through the two sides of the throttle plate. The throttle plate is cylindrical and comprises 7 through holes, the central aperture is 5.5-7mm, and the peripheral 6 apertures are the same and are 4.5-5.5 mm. The porous throttling plate can effectively reduce local turbulence and vortex in a gas circuit, is balanced and smooth, reduces pressure loss and prevents hollowing. The pressure difference detection is carried out on the two sides of the throttling plate, whether the air flow in the air circuit is normal or not can be effectively judged, and the stability of the work of the air circuit of the breathing machine and the comfort degree can be conveniently evaluated.
The pressure detection module is a pressure sensor which is a Hall sensor and is arranged at a third pressure hole of the air path, which is closer to the nose end of the user, and the pressure detection module is used for detecting the air pressure of the near nose end of the user.
The phenomenon of excessive pressure, undervoltage can appear often in brushless DC motor operation in-process, if fail in time to detect and carry out the troubleshooting, then can influence brushless DC motor's normal operating, and then influence the stability of whole breathing machine, consequently, the utility model discloses voltage detection submodule piece has been set up and has detected brushless DC motor's operating voltage. The voltage detection submodule is realized in a resistance voltage division mode.
Similarly, the operating process of the brushless dc motor often causes the phenomenon of over-high temperature, if the brushless dc motor fails to detect in time and perform corresponding processing, the operation of the brushless dc motor is affected, and the performance of the breathing machine is affected, so that the temperature detection submodule is arranged to detect the working temperature of the brushless dc motor. The temperature detection submodule is realized by using a negative temperature coefficient thermistor and a constant value resistor to divide voltage, when the temperature of the brushless direct current motor rises, the resistance value of the thermistor is reduced, the divided voltage value of the constant value resistor is increased, and the current working temperature of the brushless direct current motor can be obtained by later measurement and calculation.
The brushless direct current motor mainly comprises a rotor and a stator, wherein the rotor is positioned on the inner side of the stator. The stator is in a three-phase star connection mode, and the number of the magnetic pole pairs of the rotor is 2. The position detection submodule is a Hall sensor, the Hall sensor comprises 3 Hall elements, the three Hall elements are separated from the rotor at a phase angle of 120 degrees and used for detecting the relative position of the rotor, and the later brushless direct current motor controller submodule can control the brushless direct current motor to timely change the phase according to the relative position of the rotor so as to obtain the maximum torque and the minimum torque ripple.
Because the output of the brushless direct current motor controller submodule is TTL level, the phase change conduction of the three-phase full-bridge inverter submodule cannot be driven, and the brushless direct current motor cannot be driven to operate, the power driving submodule is arranged to amplify power, and the phase change conduction of the three-phase full-bridge inverter submodule is driven.
The three-phase full-bridge inversion submodule mainly comprises 6 MOS (metal oxide semiconductor) tubes and is used for inverting the PWM (pulse width modulation) signal output by the power driving submodule into an alternating current signal with controllable frequency so as to drive the brushless direct current motor to run. The three-phase full-bridge inversion submodule is of 120-degree conduction type, phase change conduction is carried out at intervals of 60-degree phase, each MOS tube is continuously conducted for 120 degrees, and the MOS tubes of the upper bridge arm and the lower bridge arm of the same phase are alternately conducted at a phase difference of 60 degrees.
When the brushless direct current motor is used for speed reduction adjustment, due to the existence of mechanical inertia of a rotor load, after the PWM signal input is stopped, the rotating speed of the brushless direct current motor cannot suddenly change, the rotor continues to slide, and the comfort level of a user using the breathing machine is influenced. The coil of the stator generates induced electromotive force in the changing magnetic field of the rotor, the torque generated by the interaction of the stator coil current and the rotor magnetic field is opposite to the rotation direction of the rotor, and at the moment, the brushless direct current motor converts the inertial energy of the rotor load into electric energy to be consumed in the stator coil. The utility model discloses an energy consumption braking submodule piece carries out the deceleration, concatenates the dynamic resistance, and the stator coil produces induced-current, and brushless DC motor's inertial energy conversion is dynamic resistance's heat energy, produces and rotates opposite direction's magnetic field torque with the rotor, and motor speed just can descend rapidly, has both ensured the stability of breathing machine work, has improved user comfort level again.
Further, the brushless direct current motor control module further comprises a current sampling sub-module, a signal conditioning sub-module and an overcurrent protection sub-module; the output end of the three-phase full-bridge inversion submodule is connected to the brushless direct current motor through the current sampling submodule, the signal conditioning submodule, the overcurrent protection submodule and the energy consumption braking submodule; and the output end of the signal conditioning submodule is also connected to the brushless direct current motor controller submodule.
The current sampling submodule adopts a resistance sampling method, a high-precision resistor is connected to a lower bridge arm of the three-phase full-bridge inversion submodule to convert a current signal into a voltage signal, and the current of the three-phase full-bridge inversion submodule, namely the bus current of the brushless direct current motor, can be obtained by detecting the voltage signal.
The signal conditioning submodule is a low-pass filter and is used for absorbing high-frequency interference signals of the current sampling submodule and reducing high-frequency fluctuation. The signal conditioning submodule is also provided with an integrating capacitor for reducing high-frequency gain, stabilizing direct-current components and reducing the influence of high-frequency interference signals on output signals. The output signal of the signal conditioning submodule is also input into the brushless direct current motor controller submodule to provide a data base for later-stage control of the brushless direct current motor.
The overcurrent protection submodule mainly comprises a comparator and a D trigger, wherein the in-phase input end of the comparator receives an output signal of the signal conditioning submodule, the reverse input end of the comparator receives a current-limiting voltage, and a signal output by the D trigger controls the enabling and disabling of the brushless direct current motor. When the brushless direct current motor fails and the current is larger than the limit value, the comparator outputs high level to prompt the D trigger to close the brushless direct current motor. Because the utility model discloses be equipped with the dynamic braking submodule piece, consequently the D trigger directly will close the signal transmission and give the dynamic braking submodule piece, through the brushless DC motor of dynamic braking submodule piece quick closing.
The utility model also comprises a fault alarm module; and the control end of the fault alarm module is connected with the main controller module. The fault alarm module is an audible and visual alarm, and when the detection data of the pressure difference detection module, the pressure detection module, the voltage detection submodule, the temperature detection submodule and the position detection submodule are abnormal, the main controller module sends a control signal to the fault alarm module and starts the audible and visual alarm to give an alarm.
The utility model also comprises a man-machine interaction module; the man-machine interaction module is connected with the main controller module and provides a session interface for an external user. The man-machine interaction module comprises an input submodule and an output submodule. The input sub-module comprises at least 2 keys, 1 orthogonal encoder with keys and 1 touch screen, and the output sub-module is a liquid crystal display screen. The orthogonal encoder is used for realizing the selection and determination of a function menu, and the touch screen is used as an input mode selectable by a user.
The utility model also comprises a wireless communication module and a terminal control end; the wireless communication module is connected with the main controller module and the terminal control end. The main controller module sends detection data and parameters of the brushless direct current motor control module to the terminal control end through the wireless communication module, the terminal control end sends control signals to the main controller module through the wireless communication module, and then the main controller sends the control signals to the corresponding execution module.
In the electrical field, the complete technical solution related to detection and execution inevitably includes a hardware structure and a software structure, the present invention only provides hardware support for solving the problem of "poor stability and low comfort" existing in the prior art, that is, the present technical solution only makes a contribution of hardware part for solving the technical problem, although the introduction of the inventive content makes it easier for those skilled in the art to understand the technical solution by means of the description of software content, the related software program is only simple detection data reception, value comparison, control signal issue, is a simple computer program, does not relate to value optimization, data fusion, etc., does not relate to the improvement of the computer program, and the protection scope of the claims is only a hardware structure, does not relate to the computer program, therefore, the present invention does not relate to the improvement of the computer program, belongs to a protection object of the utility model.
Claims (5)
1. The utility model provides a breathing machine monitored control system installs on outside breathing machine, outside breathing machine includes brushless DC motor, fan and gas circuit, wherein, outside breathing machine's brushless DC motor is including the rotor, be provided with throttle plate, its characterized in that in the gas circuit:
the system comprises a pressure detection module, a pressure difference detection module, a main controller module and a brushless direct current motor control module;
the air passage of the external respirator is provided with a first pressure hole, a second pressure hole and a third pressure hole, the first pressure hole is arranged in the inflow direction of a throttle plate of the external respirator, the second pressure hole is arranged in the outflow direction of the throttle plate of the external respirator, the third pressure hole is arranged in the outflow direction of the second pressure hole, the differential pressure detection module is installed between the first pressure hole and the second pressure hole and is used for detecting the differential pressure of the air passage of the external respirator, and the output end of the differential pressure detection module is connected with the main controller module; the pressure detection module is arranged at a third pressure hole and is used for detecting the pressure of the air path of the external respirator, and the output end of the pressure detection module is connected with the main controller module;
the brushless direct current motor control module comprises a brushless direct current motor controller submodule, a voltage detection submodule, a temperature detection submodule, a position detection submodule, a power driving submodule, a three-phase full-bridge inversion submodule and an energy consumption braking submodule;
the brushless direct current motor controller submodule is connected with the main controller module; the voltage detection submodule detects the working voltage of a brushless direct current motor of the external respirator in real time, and the output end of the voltage detection submodule is connected with the brushless direct current motor controller submodule; the temperature detection submodule detects the working temperature of a brushless direct current motor of the external respirator in real time, and the output end of the temperature detection submodule is connected with a brushless direct current motor controller submodule; the position detection submodule is arranged on a rotor of a brushless direct current motor of the external respirator, and the output end of the position detection submodule is connected with a brushless direct current motor controller submodule; the control end of the power driving submodule is connected with the brushless direct current motor controller submodule, and the output end of the power driving submodule is connected with the input end of the three-phase full-bridge inversion submodule; the three-phase full-bridge inversion sub-module drives a fan of the external respirator to operate; and the output end of the three-phase full-bridge inversion submodule is connected to the brushless direct current motor of the external respirator through the energy consumption braking submodule.
2. A ventilator monitoring system according to claim 1 wherein:
the brushless direct current motor control module also comprises a current sampling submodule, a signal conditioning submodule and an overcurrent protection submodule;
the output end of the three-phase full-bridge inversion submodule is connected to the brushless direct current motor through the current sampling submodule, the signal conditioning submodule, the overcurrent protection submodule and the energy consumption braking submodule; and the output end of the signal conditioning submodule is also connected to the brushless direct current motor controller submodule.
3. A ventilator monitoring system according to claim 1 wherein:
the system also comprises a fault warning module; and the control end of the fault alarm module is connected with the main controller module.
4. A ventilator monitoring system according to claim 1 wherein:
the system also comprises a human-computer interaction module; the man-machine interaction module is connected with the main controller module and provides a session interface for an external user.
5. A ventilator monitoring system according to claim 1 wherein:
the system also comprises a wireless communication module and a terminal control end; the wireless communication module is connected with the main controller module and the terminal control end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023308626.9U CN215231215U (en) | 2020-12-31 | 2020-12-31 | Breathing machine monitored control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023308626.9U CN215231215U (en) | 2020-12-31 | 2020-12-31 | Breathing machine monitored control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215231215U true CN215231215U (en) | 2021-12-21 |
Family
ID=79489019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023308626.9U Expired - Fee Related CN215231215U (en) | 2020-12-31 | 2020-12-31 | Breathing machine monitored control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215231215U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116357604A (en) * | 2023-04-11 | 2023-06-30 | 沃杰(北京)科技有限公司 | High-performance turbine fan control method, system and medium |
-
2020
- 2020-12-31 CN CN202023308626.9U patent/CN215231215U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116357604A (en) * | 2023-04-11 | 2023-06-30 | 沃杰(北京)科技有限公司 | High-performance turbine fan control method, system and medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2937558C (en) | Electrical device with filter mesh blockage detection function | |
| EP3104094B1 (en) | Method for providing constant airflow with a variable speed motor and apparatus comprising a variable speed motor and a motor controller applying same method | |
| CN105952684A (en) | New energy automobile electronic water pump and control system and method | |
| CA2934585C (en) | Air volume measurement method for fan motor | |
| CN103312245B (en) | Electric machine controller and motor control method | |
| WO2015106385A1 (en) | Constant air volume control method applied to ecm in hvac system | |
| CN205304653U (en) | Two plane type leads to fan control system based on brushless DC motor | |
| CN215231215U (en) | Breathing machine monitored control system | |
| CN104110775A (en) | Frequency-conversion air conditioner operation control method and device | |
| WO2014019128A1 (en) | Method for staring permanent magnet synchronous motor | |
| JP2017500470A5 (en) | ||
| CN102223059B (en) | Control method and control device for voltage source inverter brake circuit | |
| CN109631226A (en) | Two fans control system of air purifier and its control method | |
| CN114123884B (en) | Control method and control system of range hood | |
| CN105276651A (en) | Low-static-pressure resisting constant-air-volume control method and device and constant-air-volume kitchen ventilator | |
| JP2015142403A (en) | Ventilation device | |
| CN107421056B (en) | Variable frequency air conditioner, shutdown control method and computer readable storage medium | |
| CN106382662A (en) | Range hood provided with position-sensorless brushless direct-current motor and control method thereof | |
| CN102102681B (en) | Fan control system | |
| CN110212823B (en) | Bus voltage control method, fan bus control circuit and air conditioner | |
| CN112994534B (en) | Brushless direct current motor control method and device, brushless direct current motor and electric appliance | |
| CN110061679B (en) | Intelligent variable-frequency speed regulation device suitable for pulse type load and control method thereof | |
| CN102136731B (en) | Blower control system | |
| JP5902532B2 (en) | Power converter | |
| CN111969901A (en) | Brushless direct current motor fault-tolerant control method considering faults of Hall position sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211221 |