Self-generating magnetic suspension blower system and control method thereof

Abstract

The invention relates to the technical field of magnetic suspension blowers, in particular to a self-power-generation magnetic suspension blower system and a control method thereof. In response to a starting instruction, suspension operation of a magnetic suspension bearing is driven so as to support main shaft suspension of a motor; the rated rotating speed of the magnetic suspension air blower is obtained; under the condition that the real-time rotating speed of the magnetic suspension blower reaches the rated rotating speed and the magnetic suspension blower operates normally, if the magnetic suspension blower reaches the rated working condition point, power supply of an external power supply is cut off; working voltage is obtained, and when the working voltage is in a descending trend, the motor is used for self-generating power to be supplied to a rotor part of the motor; judging whether the rotor part is completely stopped or not, and if yes, sending out a fault alarm; if not, the main shaft falls off after the rotating speed of the rotor is reduced to the preset safety speed. Under the condition of accidental power failure, by means of inertia rotation of the motor, the motor serves as a generator to be supplied to the magnetic suspension bearing in a short time, so that the main shaft can fall down after the rotating speed of the main shaft of the motor is reduced below the safe rotating speed, and the magnetic suspension bearing and the main shaft are protected.

Description

Technical Field

[0001] The present disclosure relates to the technical field of magnetic levitation blowers, and in particular to a self-generated electromagnetic levitation blower system and a control method thereof. Background Art

[0002] In the event of an unexpected power outage (such as a sudden grid trip), if the magnetic bearings and their controllers are not continuously powered, the rotor, which can exceed 30,000 rpm, may lose control. Due to gravity, inertia, and high-speed rotation, the rotor may fall directly onto the protective bearing, causing damage to the protective bearing and the main shaft.

[0003] To address this issue, a high-power uninterruptible power supply (UPS) is currently used to provide uninterruptible power to the magnetic bearings and controllers. However, using a UPS to address sudden power outages has some drawbacks: First, high-power UPSs are expensive and take up a lot of space; second, regardless of the external power supply, the UPS must power the weak-current control system and the magnetic bearing controller. Over time, the battery life and capacity of the UPS decrease, potentially causing the UPS to malfunction during a grid outage, disrupting the entire weak-current system. This can cause the wind turbine to malfunction and, in severe cases, even cause irreparable damage to the mechanical components. Summary of the Invention

[0004] The present disclosure provides a self-generated electromagnetic levitation blower system and a control method thereof, which are used to address the shortcomings of the traditional UPS method and avoid damage to the blower and bearings by maintaining the stable operation of the magnetic levitation bearing and the weak current system.

[0005] In a first aspect, the present disclosure provides a self-generating electromagnetic levitation blower system, comprising: a controller electrically connected to an external power supply and a magnetic levitation bearing; the controller electrically connected to a frequency converter; the frequency converter electrically connected to a motor; the magnetic levitation bearings located on both sides of the motor; the motor electrically connected to an isolated DC-DC power supply; a first isolating switch connected between the frequency converter and the isolated DC-DC power supply; and a second isolating switch electrically connected between the external power supply and the magnetic levitation bearing. The frequency converter is used to adjust the input voltage and frequency of the motor under the control of the controller to adjust the operating speed of the motor; The motor is configured to generate mechanical energy by rotating under the control of the controller to drive the suspension operation of the magnetic bearing; and to convert part of the mechanical energy into electrical energy under the control of the controller; The magnetic bearing is used to support the rotor part of the motor under the control of the controller; The isolated DC-DC power supply is used to convert the electric energy generated by the magnetic bearing into a DC voltage; The first isolating switch is used to provide electrical isolation between the motor and the frequency converter; The second isolating switch is used to control the connection and disconnection between the external power supply and the inverter.

[0006] In an exemplary embodiment, the present invention further comprises: a sensor assembly connected to the controller; the sensor assembly comprises: a temperature sensor, a pressure sensor, a speed sensor, a displacement sensor, a current sensor and a voltage sensor; The temperature sensor is used to monitor the real-time temperature of the motor, the magnetic bearing and the inverter; The pressure sensor is used to monitor the system pressure and airflow pressure; The speed sensor is used to monitor the real-time speed of the motor; The displacement sensor is used to monitor the position change of the magnetic bearing; The current sensor is used to monitor the real-time current value; The voltage sensor is used to monitor the real-time voltage value.

[0007] In an exemplary embodiment, the further comprising: a pressure relief valve connected to the controller; The pressure relief valve is used to adjust the opening and closing degree under the control of the controller to adjust the system pressure and / or the airflow pressure when the system pressure exceeds a preset system pressure value and / or the airflow pressure exceeds a preset airflow pressure value.

[0008] In an exemplary embodiment, the invention further comprises: a magnetic bearing controller connected via the second isolating switch, the magnetic bearing controller being connected to the magnetic bearing; The magnetic bearing controller is used to adjust the magnetic force of the magnetic bearing according to the position change of the magnetic bearing.

[0009] In an exemplary embodiment, a touch screen connected to the external power supply and the controller is further included.

[0010] In a second aspect, the present disclosure provides a control method for a self-generated electromagnetic levitation blower system, which is applied to the self-generated electromagnetic levitation blower system of the first aspect, and the method includes: In response to a start instruction, driving the magnetic bearing to perform a suspension operation to support the main shaft of the motor; Get the rated speed of the magnetic levitation blower; When the real-time speed of the magnetic levitation blower reaches the rated speed and operates normally, if the magnetic levitation blower reaches the rated operating point, cutting off the power supply of the external power supply; obtaining an operating voltage, and when the operating voltage shows a downward trend, utilizing the motor to generate self-generated electricity to supply the rotor portion of the motor; Determine whether the rotor part has completely stopped. If so, issue a fault alarm; if not, wait until the rotor speed drops to a preset safe speed before dropping the main shaft.

[0011] In an exemplary embodiment, after responding to the start instruction, the method further includes: Check whether the sensor assembly is in normal operation; if not, issue the fault alarm; Before obtaining the rated speed of the magnetic levitation blower, it also includes: The components of the spontaneous electromagnetic suspension blower system are inspected according to a preset inspection process.

[0012] In an exemplary embodiment, the components of the self-generating electromagnetic levitation blower system are tested according to a preset testing process, including: Detecting whether the current signal is stable; if not, issuing the fault alarm; detecting whether the pressure relief valve can adjust the opening and closing degree based on the adjustment instruction of the controller; if not, issuing the fault alarm; detecting whether the frequency converter can be started based on the start instruction of the controller; if not, issuing the fault alarm; When the real-time speed of the magnetic levitation blower reaches the rated speed and operates normally, if the magnetic levitation blower reaches the rated operating point, before cutting off the power supply of the external power supply, the method further includes: Close the pressure relief valve and detect whether the system pressure and / or air flow pressure is within a preset normal range; if not, issue the fault alarm.

[0013] In a third aspect, the present disclosure provides a storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, runs the steps of the method provided in the second aspect above.

[0014] In a fourth aspect, the present disclosure provides a computer program product, comprising a computer program, which, when executed by a processor, runs the steps of the method provided in the second aspect.

[0015] It can be seen from the above technical solutions that the present disclosure has the following advantages: The present disclosure provides a self-generated electromagnetic levitation blower system and a control method thereof, the system comprising: a controller electrically connected to an external power supply and a magnetic levitation bearing; the controller electrically connected to a frequency converter; the frequency converter electrically connected to a motor; the magnetic levitation bearings located on both sides of the motor; the motor electrically connected to an isolated DC-DC power supply; a first isolating switch connected between the frequency converter and the isolated DC-DC power supply; a second isolating switch electrically connected between the external power supply and the magnetic levitation bearing; the frequency converter is used to adjust the input voltage and frequency of the motor under the control of the controller to adjust the running speed of the motor The motor is used to generate mechanical energy by rotating under the control of the controller to drive the suspension operation of the magnetic bearing; and to convert part of the mechanical energy into electrical energy under the control of the controller; the magnetic bearing is used to support the rotor part of the motor under the control of the controller; the isolated DC-DC power supply is used to convert the electrical energy generated by the magnetic bearing into a DC voltage; the first isolating switch is used to provide electrical isolation between the motor and the inverter; the second isolating switch is used to control the connection and disconnection between the external power supply and the inverter. In the event of an unexpected power outage, the motor rotates by inertia and acts as a generator for a short time to supply power to the magnetic bearing, so that the motor can drop the main shaft after the main shaft speed drops below a safe speed, thereby protecting the magnetic bearing and the main shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 The following is a schematic diagram showing the composition of the self-generated electromagnetic levitation blower system provided in the first embodiment of the present disclosure; Figure 2 The following is a flowchart showing the steps of the control method of the spontaneous electromagnetic levitation blower system provided in the second embodiment of the present disclosure. DETAILED DESCRIPTION

[0018] The embodiments of the present disclosure provide a self-generated electromagnetic levitation blower system and a control method thereof, which are used to address the shortcomings of the traditional UPS method and avoid damage to the blower and bearings by maintaining the stable operation of the magnetic levitation bearings and the weak current system.

[0019] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] For example 1, please refer to Figure 1 , Figure 1 This is a schematic diagram of the composition of the self-generated electromagnetic levitation blower system provided in Example 1 of the present disclosure. The system includes: A controller 102 and a magnetic bearing 110 electrically connected to an external power supply 101; the controller 102 is electrically connected to a frequency converter 104; the frequency converter 104 is electrically connected to a motor 109; the magnetic bearing 110 is located on both sides of the motor 109; the motor 109 is electrically connected to an isolated DC-DC power supply 112; a first isolating switch 108 is connected between the frequency converter 104 and the isolated DC-DC power supply 112; a second isolating switch 111 is electrically connected between the external power supply 101 and the magnetic bearing 110; The frequency converter 104 is used to adjust the input voltage and frequency of the motor 109 under the control of the controller 102 to adjust the operating speed of the motor 109; The motor 109 is configured to generate mechanical energy by rotating under the control of the controller 102 to drive the suspension operation of the magnetic bearing 110; and to convert part of the mechanical energy into electrical energy under the control of the controller 102; The magnetic bearing 110 is used to support the rotor part of the motor 109 under the control of the controller 102; The isolated DC-DC power supply 112 is used to convert the electric energy generated by the magnetic bearing 110 into a DC voltage; The first isolating switch 108 is used to provide electrical isolation between the motor 109 and the inverter 104; The second isolating switch 111 is used to control the connection and disconnection between the external power supply 101 and the inverter 104 .

[0021] In the disclosed embodiment, during normal operation of the self-generating electromagnetic levitation blower system, the external power supply 101, after thyristor rectification, is supplied to the inverter through the DC bus to drive the permanent magnet motor to rotate at high speed. It also supplies DC-DC power to the controller 102 after conversion. Once the external power supply 101 is disconnected and the controller 102 detects a drop in the operating voltage of the DC bus of the inverter 104, the motor 109 enters a self-generating mode, converting part of the mechanical energy into electrical energy to power the DC bus. At this time, the operating voltage of the DC bus rises rapidly after a brief drop and stabilizes at the original operating voltage. After the high-speed rotor speed drops to a preset safe speed, the main shaft drops, and the machine is shut down.

[0022] Specifically, during the operation of the motor 109, the controller 102 needs to adjust the input voltage and frequency of the motor 109 according to the rated load electromotive force to ensure that the motor 109 operates in the optimal state. The calculation expression of the rated load electromotive force is: ; in, is the rated load electromotive force, is the frequency, is the actual number of series turns per phase in the motor parameters, is the winding factor in the motor parameters, is the permanent magnet flux, is the magnetic field waveform coefficient in the motor parameters.

[0023] In the self-generating mode, the self-generating principle of the magnetic bearing 110 involves the phenomenon of electromagnetic induction, in which when a conductor moves in a magnetic field, it cuts the magnetic lines of force. According to Faraday's law of electromagnetic induction, an induced electromotive force will be generated at both ends of a conductor. The expression of Faraday's law of electromagnetic induction is: ; in, is the electromotive force, is the number of coil turns, is the magnetic flux, For time.

[0024] At the same time, in the magnetic bearing 110, when the rotor rotates in the magnetic field generated by the stator coils, the relative motion between the rotor and the magnetic field causes the conductor inside the rotor (such as the rotor material of the motor) to cut these magnetic lines of force, thereby inducing currents inside the rotor. These induced currents generate a magnetic field inside the rotor, which interacts with the magnetic field generated by the stator coils. According to Lenz's law, these interacting magnetic fields generate a force that is directed to resist the movement of the rotor relative to the stator magnetic field. This force, commonly known as magnetic resistance, stabilizes the rotor in the magnetic bearing 110, preventing it from deviating from its center position due to the inertia generated by rotation. In the design of the magnetic bearing 110, the rotor's suspension state is maintained by precisely controlling the magnitude of the current. This means that the induced current inside the rotor needs to be properly managed so that it can automatically adjust and restore the suspension state if the rotor deviates from the equilibrium position.

[0025] It should be noted that the speed and performance of the motor 109 are affected by the number of pole pairs. The pole pair calculation expression in the embodiment of the present disclosure is: ; in, is the pole pair number, is the frequency, is the speed in the motor parameters.

[0026] In an exemplary embodiment, the controller 102 further includes a sensor assembly 106 connected to the controller 102; the sensor assembly 106 includes a temperature sensor, a pressure sensor, a speed sensor, a displacement sensor, a current sensor, and a voltage sensor; The temperature sensor is used to monitor the real-time temperature of the motor, the magnetic bearing and the inverter; The pressure sensor is used to monitor the system pressure and airflow pressure; The speed sensor is used to monitor the real-time speed of the motor; The displacement sensor is used to monitor the position change of the magnetic bearing; The current sensor is used to monitor the real-time current value; The voltage sensor is used to monitor the real-time voltage value.

[0027] In the embodiment of the present disclosure, the real-time operating status of the spontaneous electromagnetic suspension blower system is obtained through temperature sensors, pressure sensors, speed sensors, displacement sensors, current sensors and voltage sensors respectively.

[0028] In an exemplary embodiment, the invention further comprises: a pressure relief valve 107 connected to the controller 102; The pressure relief valve 107 is used to adjust the opening and closing degree under the control of the controller 102 to adjust the system pressure and / or the airflow pressure when the system pressure exceeds a preset system pressure value and / or the airflow pressure exceeds a preset airflow pressure value.

[0029] In the embodiment of the present disclosure, by adjusting the opening and closing degree of the pressure relief valve 107 and coordinating the drill speed, the blower can reach the rated operating point.

[0030] In an exemplary embodiment, the invention further comprises: a magnetic bearing controller 105 connected via the second isolating switch 111 , wherein the magnetic bearing controller 105 is connected to the magnetic bearing 110 ; The magnetic bearing controller 105 is configured to adjust the magnetic force of the magnetic bearing 110 according to the position change of the magnetic bearing 110 .

[0031] In order to ensure accurate control of the magnetic bearing 110 in the disclosed embodiment, it is necessary to obtain the position change of the magnetic bearing 110 in real time through the magnetic bearing controller 105, and then adjust the magnetic force. The magnetic force can be calculated by the current in the coil and the magnetic field around the coil. In general, the calculation expression of the magnetic force is: ; in, For magnetic force, is the proportionality constant, is the current, is the initial air gap distance, is the air gap variation.

[0032] In addition, in the magnetic bearing 110, the rotor is driven to levitate by the Lorentz force generated in the magnetic field, so that it does not directly contact the bearing, thereby reducing friction. The calculation expression of the Lorentz force is: ; in, is the charge, is the charge velocity, is the magnetic field strength, is the Lorentz force.

[0033] In addition, in the magnetic bearing 110, magnetic resistance affects the magnitude and distribution of the electromagnetic force and requires precise control to ensure stable suspension of the rotor. In motor design, magnetic resistance affects the distribution of magnetic flux, thereby affecting the performance of the motor 109. The calculation expression of magnetic resistance is: ; in, is the magnetic resistance, is the magnetic path length, is the magnetic permeability, is the cross-sectional area of ​​the magnetic circuit.

[0034] In an exemplary embodiment, the device further includes a touch screen 103 connected to the external power source 101 and the controller 102 respectively.

[0035] In the disclosed embodiment, the touch screen 103 serves as a human-computer interaction interface and can display the status information of the spontaneous electromagnetic levitation blower system. After intuitively obtaining the system status information, the user can perform control operations and parameter adjustments when necessary to adjust the operating status of the system.

[0036] An embodiment of the present invention provides a spontaneous electromagnetic suspension blower system, comprising: a controller 102 and a magnetic suspension bearing 110 electrically connected to an external power supply 101; the controller 102 is electrically connected to a frequency converter 104; the frequency converter 104 is electrically connected to a motor 109; the magnetic suspension bearing 110 is located on both sides of the motor 109; the motor 109 is electrically connected to an isolated DC-DC power supply 112; a first isolation switch 108 is connected between the frequency converter 104 and the isolated DC-DC power supply 112; a second isolation switch 111 is electrically connected between the external power supply 101 and the magnetic suspension bearing 110; the frequency converter 104 is used to adjust the input voltage and frequency of the motor 109 under the control of the controller 102 to adjust the motor 1 09's operating speed; the motor 109, under the control of the controller 102, is configured to generate mechanical energy through rotation to drive the levitation operation of the magnetic bearing 110; and, under the control of the controller 102, to convert part of the mechanical energy into electrical energy; the magnetic bearing 110, under the control of the controller 102, is configured to support the rotor portion of the motor 109; the isolated DC-DC power supply 112 is configured to convert the electrical energy generated by the magnetic bearing 110 into a DC voltage; the first isolating switch 108 is configured to provide electrical isolation between the motor 109 and the inverter 104; and the second isolating switch 111 is configured to control the connection and disconnection between the external power supply 101 and the inverter 104. In the event of an unexpected power outage, the motor 109, due to its inertial rotation, briefly acts as a generator, supplying power to the magnetic bearing 110, allowing it to drop the main shaft after the motor 109's main shaft speed drops below a safe speed, thereby protecting the magnetic bearing 110 and the main shaft.

[0037] For example 2, please refer to Figure 2 , Figure 2 The flowchart of the control steps of the self-generated electromagnetic levitation blower system provided in the second embodiment of the present disclosure is applied to the self-generated electromagnetic levitation blower system mentioned in the first embodiment; the steps include: S201, in response to the start instruction, checking whether the sensor assembly is in a normal operating state; if not, issuing the fault alarm; In the embodiment of the present disclosure, after the external power supply and the controller are started, the controller will respond to the start-up instruction and enter the self-test mode to detect whether the various sensor components in the spontaneous electromagnetic levitation blower system can operate normally.

[0038] S202, driving the magnetic suspension bearing to suspend the main shaft of the motor; In the embodiment of the present disclosure, after completing the self-test, the controller drives the magnetic bearing to suspend, thereby supporting the main shaft of the motor to suspend.

[0039] S203, testing the components of the self-generated electromagnetic suspension blower system according to a preset testing process; In the embodiment of the present disclosure, before triggering the self-generating mode of the spontaneous electromagnetic levitation blower system, the components of the system need to be tested according to a preset testing process.

[0040] In an exemplary embodiment, the components of the self-generating electromagnetic levitation blower system are tested according to a preset testing process, including: Detecting whether the current signal is stable; if not, issuing the fault alarm; detecting whether the pressure relief valve can adjust the opening and closing degree based on the adjustment instruction of the controller; if not, issuing the fault alarm; Detecting whether the frequency converter can be started based on the start instruction of the controller; if not, issuing the fault alarm.

[0041] In the embodiment of the present disclosure, the preset detection process includes: current signal detection, pressure relief valve detection and inverter detection.

[0042] In specific implementation, the operator can check whether the current signal is stable through the touch screen or the host computer. Abnormal current may mean that there is a fault in the motor or the load is abnormal, and a fault alarm needs to be issued; when the current is stable and the current value is within the normal range, open the pressure relief valve and open and close it several times to check whether the valve is working properly. If the pressure relief valve cannot respond normally to the controller's adjustment instructions, it means that the system may not be able to effectively protect the equipment when the pressure is abnormal, and a fault alarm needs to be issued; when the pressure relief valve is normal, start the inverter and check whether the inverter is working properly. If the inverter cannot start normally, the motor will not be able to obtain correct power control, the system will not be able to operate normally, and a fault alarm needs to be issued.

[0043] S204, obtaining the rated speed of the magnetic levitation blower; In the embodiment of the present disclosure, the rated speed set by the user is received while ensuring that the spontaneous electromagnetic levitation blower system is operating normally.

[0044] S205, closing the pressure relief valve and detecting whether the system pressure and / or air flow pressure are within a preset normal range; if not, issuing the fault alarm; In the disclosed embodiments, before the system reaches its rated operating point and prepares to disconnect the external power supply, it is essential to ensure that the system pressure and airflow pressure are within a safe range. If the pressure is too high or too low, the device may not operate safely. After closing the pressure relief valve, sensors monitor the system pressure and airflow pressure to ensure that these parameters are within the normal range, thereby preventing damage to the device or performance degradation caused by abnormal pressure during the self-generated power generation process.

[0045] S206, when the real-time speed of the magnetic levitation blower reaches the rated speed and operates normally, if the magnetic levitation blower reaches the rated operating point, cutting off the power supply of the external power supply; In the disclosed embodiments, rated speed is a prerequisite for achieving rated operating conditions. In a self-generating electromagnetic levitation blower system, the motor speed directly affects the gas flow rate and pressure. Therefore, to achieve the rated operating point (such as rated flow and pressure), the motor must operate at the rated speed.

[0046] S207, obtaining the operating voltage, and when the operating voltage shows a downward trend, utilizing the motor to generate self-generated electricity to supply the rotor portion of the motor; In the embodiment of the present disclosure, once the controller detects that the operating voltage of the inverter DC bus shows a downward trend, it will trigger the self-generation mode of the motor, convert part of the mechanical energy into electrical energy to power the DC bus. At this time, the operating voltage of the DC bus will rise rapidly after a short period of time and stabilize at an operating voltage within the normal range.

[0047] S208, determining whether the rotor part has completely stopped, if so, issuing a fault alarm; if not, waiting for the rotor speed to drop to a preset safety speed before dropping the main shaft.

[0048] In the disclosed embodiment, once the high-speed rotor speed has dropped to a preset safe speed, the main shaft is lowered, completing the shutdown process. Furthermore, in the disclosed embodiment, any abnormality triggering a fault alarm will display the fault point on the touch screen and the host computer, and the blower will enter the shutdown process.

[0049] The disclosed embodiment provides a control method for a self-generated electromagnetic levitation blower system, the method comprising: in response to a start command, driving the suspension operation of a magnetic levitation bearing to support the suspension of a motor main shaft; obtaining the rated speed of the magnetic levitation blower; when the real-time speed of the magnetic levitation blower reaches the rated speed and operates normally, if the magnetic levitation blower reaches the rated operating point, cutting off the power supply of an external power supply; obtaining the operating voltage, and when the operating voltage shows a downward trend, using the motor to generate self-generated electricity to supply the rotor portion of the motor; determining whether the rotor portion has completely stopped, and if so, issuing a fault alarm; if not, waiting for the rotor speed to drop to a preset safe speed before dropping the main shaft. In the event of an unexpected power outage, the motor rotates by inertia, acting as a generator for a short time to supply power to the magnetic levitation bearing, so that the motor can drop the main shaft after the motor main shaft speed drops below the safe speed, thereby protecting the magnetic levitation bearing and the main shaft.

[0050] In a third embodiment, the present invention further provides a computer storage medium having a computer program stored thereon. When the computer program is executed by the processor, the steps of the control method of a spontaneous electromagnetic levitation blower system in the second embodiment are implemented.

[0051] In a fourth embodiment, the present invention further provides a computer program product having a computer program stored thereon. When the computer program is executed by the processor, the steps of the control method of a spontaneous electromagnetic levitation blower system in the second embodiment are implemented.

[0052] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0053] In the several embodiments provided in this application, it should be understood that the methods, devices, electronic devices and storage media disclosed in the present invention can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0054] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0055] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0056] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a readable storage medium and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned readable storage medium includes various media that can store program code, such as a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0057] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A spontaneous electromagnetic suspension blower system, characterized in that: include: A controller and a magnetic bearing electrically connected to an external power supply; the controller is electrically connected to a frequency converter; the frequency converter is electrically connected to a motor; the magnetic bearing is located on both sides of the motor; the motor is electrically connected to an isolated DC-DC power supply; a first isolating switch is connected between the frequency converter and the isolated DC-DC power supply; a second isolating switch is electrically connected between the external power supply and the magnetic bearing; The frequency converter is used to adjust the input voltage and frequency of the motor under the control of the controller to adjust the running speed of the motor; The motor is used to generate mechanical energy by rotating under the control of the controller to drive the suspension operation of the magnetic suspension bearing; and converting part of the mechanical energy into electrical energy under the control of the controller; The magnetic bearing is used to support the rotor part of the motor under the control of the controller; The isolated DC-DC power supply is used to convert the electric energy generated by the magnetic bearing to obtain a DC voltage; The first isolating switch is used to provide electrical isolation between the motor and the frequency converter; The second isolating switch is used to control the connection and disconnection between the external power supply and the inverter.

2. The spontaneous electromagnetic suspension blower system according to claim 1, characterized in that: Also includes: a sensor assembly connected to the controller; The sensor assembly includes: a temperature sensor, a pressure sensor, a speed sensor, a displacement sensor, a current sensor and a voltage sensor; The temperature sensor is used to monitor the real-time temperature of the motor, the magnetic bearing and the inverter; The pressure sensor is used to monitor the system pressure and the airflow pressure; The speed sensor is used to monitor the real-time rotation speed of the motor; The displacement sensor is used to monitor the position change of the magnetic bearing; The current sensor is used to monitor the real-time current value; The voltage sensor is used to monitor the real-time voltage value.

3. The self-generated electromagnetic suspension blower system according to claim 2, characterized in that: Also includes: a pressure relief valve connected to the controller; The pressure relief valve is used to adjust the opening and closing degree under the control of the controller to adjust the system pressure and / or the airflow pressure when the system pressure exceeds a preset system pressure value and / or the airflow pressure exceeds a preset airflow pressure value.

4. The self-generated electromagnetic suspension blower system according to claim 2, characterized in that: Also includes: A magnetic bearing controller connected via the second isolating switch, wherein the magnetic bearing controller is connected to the magnetic suspension bearing; The magnetic bearing controller is used to adjust the magnetic force of the magnetic bearing according to the position change of the magnetic bearing.

5. The self-generated electromagnetic suspension blower system according to claim 1, characterized in that: It also includes a touch screen connected to the external power supply and the controller respectively.

6. A control method for a spontaneous electromagnetic suspension blower system, characterized in that: Applied to the self-generated electromagnetic suspension blower system as claimed in claims 1 to 5, the method comprises: In response to a start command, driving the magnetic suspension bearing to perform a suspension operation to support the main shaft of the motor to suspend; Get the rated speed of the magnetic levitation blower; When the real-time speed of the magnetic levitation blower reaches the rated speed and operates normally, if the magnetic levitation blower reaches the rated operating point, the power supply of the external power supply is cut off; Obtaining a working voltage, and when the working voltage shows a downward trend, using the motor to generate self-powered electricity to supply the rotor part of the motor; It is determined whether the rotor part is completely stopped. If so, a fault alarm is issued; if not, the main shaft is dropped after the rotor speed drops to a preset safety speed.

7. The control method of the spontaneous electromagnetic suspension blower system according to claim 6, characterized in that: After responding to the start instruction, the method further includes: Check whether the sensor assembly is in normal operation; if not, issue the fault alarm; Before obtaining the rated speed of the magnetic levitation blower, it also includes: The components of the spontaneous electromagnetic suspension blower system are inspected according to a preset inspection process.

8. The control method of the spontaneous electromagnetic suspension blower system according to claim 7, characterized in that: The components of the self-generated electromagnetic suspension blower system are tested according to a preset testing process, including: Detect whether the current signal is stable; if not, issue the fault alarm; Detecting whether the pressure relief valve can adjust the opening and closing degree based on the adjustment instruction of the controller; if not, issuing the fault alarm; Detecting whether the frequency converter can be started based on the start-up instruction of the controller; if not, issuing the fault alarm; When the real-time speed of the magnetic suspension blower reaches the rated speed and operates normally, if the magnetic suspension blower reaches the rated operating point, before cutting off the power supply of the external power supply, the method further includes: The pressure relief valve is closed, and the system pressure and / or the air flow pressure are detected to see whether they are within a preset normal range; if not, the fault alarm is issued.

9. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 6 to 8 is executed.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method according to any one of claims 6 to 8 is implemented.

Images