Magnetic suspension bearing control system, control method and refrigeration equipment

Abstract

The invention relates to a magnetic suspension bearing control system and method and refrigeration equipment, and the system comprises a magnetic suspension bearing control module which is used for controlling a magnetic suspension bearing; the battery management module is electrically connected with the magnetic suspension bearing control module; and the master control module is respectively connected with the magnetic suspension bearing control module and the battery management module and can control the battery management module to store electric energy when the voltage of the magnetic suspension bearing control module is excessive and supply power to the magnetic suspension bearing control module when the power supply of the magnetic suspension bearing control module is insufficient. According to the technical scheme of the magnetic suspension bearing control system, through cooperative work of the battery management module and the master control module, the stability, the energy-saving performance and the response speed of the system are enhanced, the service life of equipment is effectively prolonged, and the maintenance cost is reduced. The integrated solution provides a safer, more reliable and more economical operating environment for high-performance and high-precision mechanical equipment.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, and more specifically to a magnetic levitation bearing control system, control method, and refrigeration equipment. Background Technology

[0002] Traditional refrigeration equipment based on magnetic bearings typically does not include energy storage devices, or even if a battery is present, the hardware topology of the magnetic bearing and battery is separate from the software control system. This separation leads to the following problems:

[0003] Energy waste: During system operation, especially when the compressor frequency changes, excess energy is not fully utilized and is not stored for backup.

[0004] Degradation of dynamic performance of magnetic levitation bearings: Traditional systems require time to adjust and stabilize magnetic levitation bearings during startup and shutdown. Due to the lack of effective energy distribution methods, the dynamic performance of the bearings may degrade during frequency switching.

[0005] Poor system stability: When the system suddenly loses power, there is a risk that the magnetic bearing may fall off, which may damage the magnetic bearing and cause abnormal operation of the system.

[0006] Therefore, it is necessary to improve the existing magnetic levitation bearing control system. Summary of the Invention

[0007] To address the above problems, this invention provides a magnetic levitation bearing control system, comprising:

[0008] The magnetic levitation bearing control module is configured to control the magnetic levitation bearing;

[0009] The battery management module is electrically connected to the magnetic levitation bearing control module; and

[0010] The main control module is connected to both the magnetic levitation bearing control module and the battery management module. It can control the battery management module to store the electrical energy of the magnetic levitation bearing control module when the voltage of the magnetic levitation bearing control module is excessive, and to supply power to the magnetic levitation bearing control module when the power supply is insufficient.

[0011] Its technical effects mainly include the following aspects:

[0012] Improve system reliability and stability

[0013] By coordinating the battery management module and the magnetic bearing control module, the system can automatically provide backup power when the power supply to the magnetic bearing control module fails. This ensures that the magnetic bearing (AMB) can still operate normally in the event of main power fluctuations or power outages, avoiding system failures or downtime due to insufficient power. Especially in high-speed rotating machinery, the stability of the magnetic bearing is crucial, and this technology effectively improves the system's safety and stability.

[0014] Energy saving and energy management optimization:

[0015] This technical solution uses a battery management module to store excess electrical energy when the magnetic levitation bearing's rotational speed is low, and releases the stored energy when the magnetic levitation bearing's power supply is insufficient. This energy management mechanism not only improves the system's energy utilization efficiency but also reduces unnecessary energy waste. For example, when the system is under light load or in deceleration mode, the energy demand of the magnetic levitation bearing system decreases, and the battery can effectively store this excess energy, releasing it when needed.

[0016] Improve dynamic performance and respond quickly to power supply demands:

[0017] The battery management module in this system can quickly provide power when the magnetic levitation bearing control module is underpowered, ensuring the continuous and stable operation of the magnetic levitation bearing system. This rapid response capability plays a crucial role, especially during power fluctuations, as it can promptly compensate for power shortages and prevent system performance degradation or sudden failures.

[0018] Implement modular and integrated design to reduce system costs:

[0019] The main control module is connected to the magnetic levitation bearing control module and the battery management module, realizing centralized control and coordinated operation of the system. By integrating the control logic, the hardware and software architecture of the system is simplified, reducing the required control components and cables. This not only reduces costs but also reduces the system's footprint, contributing to improved overall compactness and reliability. In some preferred embodiments, at least some circuits in the main control module, magnetic levitation bearing control module, and battery management module can be integrated into a single chip. Other peripheral circuits, or those that are not convenient to integrate into the chip, can also be rationally utilized and space-saving by being arranged in a proximate manner.

[0020] Enhance the system's fault protection capabilities:

[0021] In critical applications such as industrial compressors or turbines, sudden power outages or insufficient power supply can lead to serious malfunctions. This solution provides emergency power to the magnetic levitation bearings via batteries, ensuring continuous system operation during power failures and preventing unexpected shutdowns or equipment damage. This significantly improves the system's fault tolerance and recovery capabilities.

[0022] The technical solution of this magnetic levitation bearing control system enhances system stability, energy efficiency, and response speed through the coordinated operation of the battery management module and the main control module, effectively extending equipment life and reducing maintenance costs. This integrated solution provides a safer, more reliable, and economical operating environment for high-performance, high-precision mechanical equipment.

[0023] Optionally, the main control module includes a charge / discharge signal generation module connected to the control terminal of the battery management module, which can send a corresponding control signal to control the charging / discharging of the battery management module based on a signal characterizing the input voltage excess / insufficient of the magnetic levitation bearing control module.

[0024] Optionally, the main control module further includes a voltage judgment module, which is connected to the magnetic levitation bearing control module and the charge / discharge signal generation module, and is capable of determining whether the input voltage of the magnetic levitation bearing control module is excessive or insufficient based on an electrical signal characterizing the input voltage of the magnetic levitation bearing control module.

[0025] Optionally, the main control module further includes a magnetic levitation bearing control signal generation module, which is connected to the magnetic levitation bearing control module and can send corresponding control signals based on the operating status of the magnetic levitation bearing.

[0026] Optionally, the battery management module includes: a rechargeable battery; and a DC-DC converter unit connected to the magnetic levitation bearing control module, the main control module, and the rechargeable battery. The converter unit is capable of responding to control signals from the main control module to convert the charging voltage input from the magnetic levitation bearing control module to the rechargeable battery and the discharging voltage of the rechargeable battery, so that the charging voltage and the discharging voltage are adapted to the battery management module and the magnetic levitation bearing control module.

[0027] Optionally, the DC-DC conversion unit includes: an energy storage unit capable of temporarily storing the charging energy of the magnetic levitation bearing control module and the discharging energy of the rechargeable battery; and

[0028] The logic switch unit, connected to the main control module and the energy storage unit, is capable of storing energy in the energy storage unit by means of a switch control when the main control module sends a signal indicating that the voltage of the magnetic levitation bearing control module is excessive, and releasing the energy stored in the energy storage unit by means of a switch control when the main control module sends a signal indicating that the voltage of the magnetic levitation bearing control module is insufficient.

[0029] Optionally, the logic switching unit includes:

[0030] The first power switching unit has its drain connected to the positive terminal of the power supply of the magnetic levitation bearing control module, its gate connected to the first terminal of the energy storage unit, and its source connected to the main control module.

[0031] The second power switching unit has its drain connected to the first terminal of the energy storage unit, its gate connected to the negative terminal of the power supply of the rechargeable battery and the magnetic levitation bearing control module, and its source connected to the output terminal of the logic inverter; and

[0032] The input terminal of the logic inverter is connected to the main control module.

[0033] In this application, the logic switch unit has a relatively simple structure, achieving DC-DC conversion at a low hardware cost.

[0034] Optionally, the energy storage unit is an inductor.

[0035] To achieve the above-mentioned objectives, this application provides a refrigeration device, including the magnetic levitation bearing control system described above.

[0036] When applied to refrigeration equipment, the compressor can start more quickly because the battery management module and the power supply can simultaneously power the magnetic levitation bearing. Furthermore, the compressor's operating frequency adjusts according to current refrigeration demand, and the rotational speed of the magnetic levitation bearing changes accordingly. The magnetic levitation bearing control system provided in this application can charge the battery management module when the bearing decelerates and discharge it when the bearing accelerates, thereby assisting the power supply in controlling the magnetic levitation bearing. This design not only makes the refrigeration equipment respond faster but also makes full use of energy and reduces energy loss.

[0037] To achieve the above-mentioned objectives, this application provides a control method for a magnetic levitation bearing, comprising the following steps:

[0038] Detect the power supply voltage of the magnetic levitation bearing;

[0039] If the supply voltage is excessive, then use the supply voltage to charge the UPS power supply; and

[0040] If the supply voltage is insufficient, the UPS power supply will be used.

[0041] This magnetic levitation bearing control method, through intelligent power management combined with power supply voltage detection and the use of a UPS (uninterruptible power supply), brings the following technical benefits:

[0042] Improve system stability and reliability:

[0043] By monitoring the power supply voltage of the magnetic levitation bearing and switching to the UPS power supply in a timely manner when the voltage is insufficient, the system can continue to operate stably even when there are voltage fluctuations or external power failures. This redundant power supply scheme effectively avoids equipment downtime or failure due to power interruptions, thus improving the reliability of the system.

[0044] Optimize energy efficiency:

[0045] When there is excess voltage, charging the UPS power supply can prevent power waste and ensure that the UPS power supply has sufficient power when needed. This dynamic power management not only saves energy but also makes rational use of resources when the grid supply is sufficient, improving overall energy efficiency.

[0046] Extend equipment life:

[0047] Because the system can automatically switch to UPS power supply in the event of unstable or low power supply, it avoids potential damage to the equipment caused by operating under low voltage conditions and extends the service life of the equipment.

[0048] The magnetic levitation bearing control system and control method provided by this invention have at least the following advantages:

[0049] Improved energy efficiency: By storing excess energy from the magnetic levitation bearings in batteries, energy waste can be reduced. This is especially beneficial during compressor frequency reduction and increase, allowing for more efficient energy allocation.

[0050] Accelerated system response time: During frequency reduction, the battery charges and absorbs excess energy, thereby accelerating the system's frequency reduction speed. During frequency ramp-up startup, the battery discharges to provide additional energy to the magnetic levitation bearing system, shortening the startup time and making the magnetic levitation bearing start-up faster and smoother.

[0051] Enhancing system reliability: The battery, acting as an uninterruptible power supply (UPS), continuously powers the system in the event of a sudden power outage, ensuring stable control of the magnetic levitation bearing and preventing system failures caused by sudden power outages. The battery also ensures that more fault data can be saved, facilitating subsequent diagnosis and maintenance.

[0052] Reduced hardware cost and size: Integrating magnetic bearing control and battery control into a unified control topology not only reduces the number of independent hardware components required by the system, but also reduces the size of the hardware, thereby reducing the overall system cost.

[0053] In summary, this technical solution integrates the magnetic levitation bearing control module and the battery management module, achieving efficient energy management and stable system operation. Furthermore, the integrated design saves space in the equipment. Attached Figure Description

[0054] Figure 1 This is a schematic diagram of the magnetic levitation bearing control system provided in an embodiment of the present invention.

[0055] Figure 2 yes Figure 1 The diagram shows the structure of the magnetic levitation bearing control module in the magnetic levitation bearing control system.

[0056] Figure 3 yes Figure 2 The diagram shows the structure of the power supply in the magnetic levitation bearing control module.

[0057] Figure 4 yes Figure 1 The diagram shows the overall control module of the magnetic levitation bearing control system.

[0058] Figure 5 yes Figure 1 The diagram shows the overall control module of the magnetic levitation bearing control system.

[0059] Figure 6 yes Figure 1 The diagram shows the overall control module of the magnetic levitation bearing control system.

[0060] Figure 7 This is a schematic diagram of the magnetic levitation bearing control system provided in an embodiment of the present invention.

[0061] Figure 8 This is a schematic diagram of the steps of the magnetic levitation bearing control method provided by the embodiments of the present invention. Detailed Implementation

[0062] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0063] This embodiment provides a magnetic levitation bearing control system, such as Figure 1 As shown, the system includes a magnetic levitation bearing control module 100 configured to control the magnetic levitation bearing; a battery management module 200 electrically connected to the magnetic levitation bearing control module 100; and a main control module 300 connected to both the magnetic levitation bearing control module 100 and the battery management module 200, and capable of controlling the battery management module 200 to store the electrical energy of the magnetic levitation bearing control module 100 when the voltage of the magnetic levitation bearing control module 100 is excessive, and to supply power to the magnetic levitation bearing control module 100 when the power supply is insufficient.

[0064] It should be noted that the voltage excess mentioned in this embodiment includes not only the excessively high voltage caused by fluctuations in the mains voltage, but also the voltage redundancy caused by the low rotational speed and current demand of the magnetic levitation bearing in specific application scenarios.

[0065] Similarly, the insufficient voltage mentioned in this embodiment includes not only extreme situations such as low voltage caused by fluctuations in the mains voltage or power outages, but also situations where the magnetic levitation bearing needs to accelerate the start-up when the system requires rapid startup. In such cases, it can also be determined that the voltage is insufficient, and the battery management module 200 is introduced to provide auxiliary power to the magnetic levitation bearing.

[0066] Its technical effects mainly include the following aspects:

[0067] Improve system reliability and stability

[0068] Through the cooperation of the battery management module 200 and the magnetic bearing control module 100, the system can automatically provide backup power when the power supply to the magnetic bearing control module 200 fails. This ensures that the magnetic bearing (AMB) can still operate normally in the event of main power fluctuations or power outages, avoiding system failures or shutdowns due to insufficient power. Especially in high-speed rotating machinery, the stability of the magnetic bearing is crucial, and this technology effectively improves the safety and stability of the system.

[0069] Energy saving and energy management optimization:

[0070] This technical solution utilizes a battery management module 200 to store excess electrical energy when the magnetic levitation bearing's rotational speed demand is low, and releases the stored energy when the magnetic levitation bearing's power supply is insufficient. This energy management mechanism not only improves the system's energy utilization efficiency but also reduces unnecessary energy waste. For example, when the system is under light load or in deceleration mode, the energy demand of the magnetic levitation bearing system decreases, and the battery can effectively store this excess energy, releasing it when needed.

[0071] Improve dynamic performance and respond quickly to power supply demands:

[0072] The battery management module 200 in this system can quickly provide power when the magnetic levitation bearing control module 100 is underpowered, ensuring the continuous and stable operation of the magnetic levitation bearing system. This rapid response capability plays a crucial role, especially during power fluctuations, as it can promptly compensate for power shortages and prevent system performance degradation or sudden failures.

[0073] Implement modular and integrated design to reduce system costs:

[0074] The main control module 300 is connected to the magnetic levitation bearing control module 100 and the battery management module 200, realizing centralized control and coordinated operation of the system. By integrating the control logic, the hardware and software architecture of the system is simplified, reducing the required control components and cables. This not only reduces costs but also reduces the system's footprint, helping to improve the overall compactness and reliability of the equipment. In some preferred embodiments, at least some circuits in the main control module 300, the magnetic levitation bearing control module 100, and the battery management module 200 can be integrated into a single chip. Other peripheral circuits or peripheral circuits that are not convenient to integrate into the chip can also be rationally utilized and space-saving by being arranged in a close proximity.

[0075] Enhance the system's fault protection capabilities:

[0076] In critical applications such as industrial compressors or turbines, sudden power outages or insufficient power supply can lead to serious malfunctions. This solution provides emergency power to the magnetic levitation bearings via batteries, ensuring continuous system operation during power failures and preventing unexpected shutdowns or equipment damage. This significantly improves the system's fault tolerance and recovery capabilities.

[0077] The technical solution of this magnetic levitation bearing control system enhances system stability, energy efficiency, and response speed through the coordinated operation of the battery management module and the main control module, effectively extending equipment life and reducing maintenance costs. This integrated solution provides a safer, more reliable, and economical operating environment for high-performance, high-precision mechanical equipment.

[0078] Optionally, such as Figure 2 As shown, the magnetic levitation bearing control module 100 includes a power supply 110, a magnetic levitation bearing control unit 120, and a magnetic levitation bearing-permanent magnet synchronous motor unit 130. The power supply 110 supplies power to the magnetic levitation bearing control module 100, and its output terminal is connected to the input terminal of the magnetic levitation bearing control unit 120. The magnetic levitation bearing control unit 120 is connected to the magnetic levitation bearing-permanent magnet synchronous motor unit 130 and can control the magnetic levitation bearing-permanent magnet synchronous motor unit 130.

[0079] The magnetic levitation bearing control unit 120 enables precise control of the magnetic levitation bearing. The working principle of the magnetic levitation bearing is to levitate and support the rotating shaft through electromagnetic force, avoiding mechanical contact and friction. During operation, the magnetic levitation bearing control unit 120 adjusts the current and voltage of the electromagnetic coil in real time to control the strength and direction of the electromagnetic force, thereby keeping the rotor stably levitated. This contactless magnetic levitation reduces friction and wear, ensuring efficient operation of the rotating machinery. The magnetic levitation bearing control unit 120 can also quickly adjust the electromagnetic force based on signals from the rotating shaft's position sensor to compensate for vibrations or misalignments during high-speed operation, ensuring the shaft remains levitated in the ideal position. Through this real-time adjustment, the system can control the rotor's stability with extremely high precision.

[0080] The magnetic levitation bearing-permanent magnet synchronous motor unit 130 includes a magnetic levitation bearing: the magnetic levitation bearing is responsible for levitizing and supporting the rotating shaft, specifically by controlling the magnetic force generated by the electromagnetic coil to achieve contactless support. With the real-time adjustment of the coil current by the magnetic levitation bearing control unit 120, the levitation force can remain stable, ensuring that the rotating shaft will not undergo physical collisions when rotating at high speed.

[0081] It also includes a permanent magnet synchronous motor (PMSM) connected to a magnetic bearing, which generates rotational motion through the interaction of stator current and permanent magnets on the rotor. By adjusting the phase and amplitude of the stator current, the magnetic bearing control module can precisely control the speed and torque of the PMSM, ensuring that mechanical systems (such as compressors, turbines, etc.) operate at a predetermined speed and power.

[0082] A permanent magnet synchronous motor (PMSM) is a high-efficiency motor that uses the magnetic field generated by permanent magnets to synchronize with the rotating magnetic field in the stator windings. In a magnetic bearing control system, the PMSM drives the compressor. Through adjustment by the magnetic bearing control module, the PMSM can operate at different frequencies according to the compressor's needs. The magnetic bearing control module adjusts the motor's power supply frequency based on real-time requirements, achieving variable frequency drive for the compressor. This variable frequency drive method allows the system to respond flexibly under different operating conditions, optimizing energy efficiency.

[0083] like Figure 3 As shown, the power supply 110 includes an AC power supply 111, a rectifier circuit 112, and a filter capacitor 113.

[0084] The AC power supply 111 provides three phases of AC power with a 120-degree phase difference, and is typically used to power industrial equipment or large motor systems. Its main advantages are more stable power transmission and higher power output.

[0085] The function of rectifier circuit 112 is to convert three-phase alternating current (AC) into direct current (DC). A common rectifier is a diode rectifier bridge. Through the unidirectional conductivity of the diodes, the positive and negative half-cycles of the AC current are respectively conducted to the same polarity, thus forming pulsating DC current. Each diode conducts only during the positive half-cycle of the AC current, directing the positive voltage to the output terminal. During the negative half-cycle, the diode blocks the negative voltage and conducts the positive voltage of the adjacent phase at the corresponding time. Because the three-phase AC current is 120 degrees out of phase, the rectifier can achieve a relatively smooth DC current output.

[0086] Since the DC current output still contains ripple at this point, the power supply 110 also includes a filter capacitor 113 to filter out the ripple in the output. Specifically, the capacitor is used for filtering, i.e., smoothing the rectified DC voltage. The rectified DC voltage is usually not a perfectly straight line, but rather contains some pulsations or ripples. The charging and discharging characteristics of the capacitor can smooth these ripples, providing a relatively stable DC voltage. During the rise of the DC voltage, the capacitor charges to absorb excess energy. When the voltage drops, the capacitor discharges to replenish the insufficient energy, thus maintaining a smoother DC output. The filter capacitor 113 ensures that the rectified DC voltage is smooth and stable before being supplied to the magnetic levitation bearing control module, reducing the impact of voltage fluctuations on system operation.

[0087] The input terminal of the magnetic levitation bearing control unit 120 is connected to the power supply 110, which supplies power to it. The output terminal of the magnetic levitation bearing control unit 120 is connected to the magnetic levitation bearing-permanent magnet synchronous motor unit 130. It can adjust the speed and torque of the magnetic levitation bearing-permanent magnet synchronous motor unit 130 by adjusting the frequency and magnitude of the output electrical signal.

[0088] The magnetic levitation bearing control unit 120 can consist of a three-phase inverter or the power drive circuit shown in the figure, typically composed of power switching devices (such as MOSFETs or IGBTs) and freewheeling diodes. Its main function is to convert direct current (DC) to alternating current (AC), and it can drive a permanent magnet synchronous motor (PMSM) by adjusting the output frequency and voltage based on the control signal at the control terminal.

[0089] Specifically, in this embodiment, the power switching device achieves DC-AC conversion through rapid switching (on and off). A control signal is used to regulate the on and off states of the switch, thereby generating AC voltages of different frequencies and amplitudes.

[0090] The output terminals (A, B, C) of the three-phase driver are respectively connected to the three windings of the magnetic levitation bearing-permanent magnet synchronous motor unit 130. By controlling the voltage and current of each phase, a rotating magnetic field is generated, thereby driving the magnetic levitation bearing-permanent magnet synchronous motor unit 130 to rotate.

[0091] like Figure 4 As shown, the main control module 300 includes a charge / discharge signal generation module 310, which is connected to the control terminal of the battery management module 200. Based on the signal characterizing the input voltage of the magnetic levitation bearing control module 100 as excessive or insufficient, the charge / discharge signal generation module 310 sends a corresponding control signal to control the charging / discharging of the battery management module 200.

[0092] Optionally, such as Figure 5 As shown, the main control module 300 also includes a voltage judgment module 320, which is connected to the magnetic levitation bearing control module 100 and the charge / discharge signal generation module 310. It can determine whether the input voltage of the magnetic levitation bearing control module 100 is excessive or insufficient based on an electrical signal characterizing the input voltage of the magnetic levitation bearing control module 100. Specifically, the voltage judgment module 320 can sample the power supply voltage of the magnetic levitation bearing control module 100 and compare it with a preset threshold voltage. Based on the comparison result, it determines whether the input voltage is excessive or insufficient. If it is excessive, it sends a corresponding signal to the charge / discharge signal generation module 310, which then sends a charging signal; conversely, if the voltage is insufficient, it sends a discharging signal. Furthermore, as mentioned above, due to different application scenarios and usage requirements, this embodiment does not define the specific criteria for excessive / insufficient voltage. Those skilled in the art can, based on the spirit of this invention, use specific logic to detect and determine whether a battery management module 200 is needed for auxiliary power supply. All the above embodiments are within the protection scope of this invention.

[0093] It should be noted that in some embodiments, the voltage judgment module 320 can also be set independently (without needing to be integrated into the main control module 300), or it can be set as an integral part of the charge and discharge signal generation module 310. In this way, the charge and discharge signal generation module 310 can directly sample the power supply voltage of the magnetic levitation bearing control module 100 and send the corresponding control signal based on the comparison relationship between the sampling result and the preset threshold.

[0094] Optionally, such as Figure 6 As shown, the main control module 300 also includes a magnetic levitation bearing control signal generation module 330, which is connected to the magnetic levitation bearing control module 200. It can send corresponding control signals G_AMB based on the operating status of the magnetic levitation bearing. More specifically, the magnetic levitation bearing control signal generation module is connected to the control terminal of the magnetic levitation bearing control unit 120.

[0095] like Figure 7As shown, the battery management module 200 includes a DC-DC converter unit 210 and a rechargeable battery 220 connected thereto. The DC-DC converter unit 210 manages the charging and discharging process of the rechargeable battery 220. During charging, it can step down the high voltage to a suitable voltage for the rechargeable battery 220, and during discharging, it can boost the voltage of the rechargeable battery 220 to the voltage required by the magnetic levitation bearing control system.

[0096] The rechargeable battery 220 can store and release electrical energy, and can be a lithium-ion battery (Li-ion), a nickel-metal hydride battery (NiMH), a lead-acid battery, or a lithium iron phosphate battery (LiFePO4).

[0097] The DC-DC conversion unit 210 is connected to the magnetic levitation bearing control module 100, the main control module 300, and the rechargeable battery 220. It can respond to the control signal G_DCDC from the main control module 300 to convert the charging voltage and the discharging voltage of the rechargeable battery 220 input from the magnetic levitation bearing control module 100, so that the charging voltage and discharging voltage are adapted to the battery management module 200 and the magnetic levitation bearing control module 100.

[0098] Optionally, the DC-DC conversion unit 210 includes: an energy storage unit 212, capable of temporarily storing the charging energy of the magnetic levitation bearing control module 100 and the discharging energy of the rechargeable battery 220; and a logic switch unit 211, which is connected to the main control module 300 and the energy storage unit 212. In response to the main control module 300 sending a signal indicating that the magnetic levitation bearing control module 100 has an excessive voltage, the logic switch unit 211 stores energy in the energy storage unit 212 through a switch control. In response to the main control module 300 sending a signal indicating that the magnetic levitation bearing control module 100 has an insufficient voltage, the logic switch unit 211 releases the energy stored in the energy storage unit 212 through a switch control.

[0099] More specifically, the logic switching unit 211 includes a first power switching unit 2111, a second power switching unit 2112, and a logic inverter 2113. The first logic switching unit 2111 is composed of a first MOSFET NM1 and a first diode D1 connected in parallel. The cathode of the first diode D1 is connected to the drain of the first MOSFET NM1, and the anode of the first diode D1 is connected to the gate of the first MOSFET NM1. The source of the first MOSFET NM1 and the input terminal of the logic inverter 2113 are connected to the charge / discharge signal generation module 310 of the main control module 300. The second power switching unit 2112 is composed of a second MOSFET NM2 and a second diode D1. The circuit consists of two parallel diodes: the cathode of the second diode D2 is connected to the drain of the second MOSFET NM2, the anode of the second diode D2 is connected to the gate of the second MOSFET NM2, the source of the second MOSFET NM2 is connected to the output of the logic inverter 2113, the gate of the first MOSFET NM1 and the drain of the second MOSFET NM2 are connected to the first terminal of the energy storage unit 212, the second terminal of the energy storage unit 212 is connected to the positive terminal of the rechargeable battery 220, the gate of the second MOSFET NM2 is connected to the negative terminal of the rechargeable battery 220 and the negative terminal of the power supply 110, and the drain of the first MOSFET NM2 is connected to the positive terminal of the power supply 110.

[0100] The working principle of the battery management module 200 is as follows: When the magnetic levitation bearing control system has excess energy (excess voltage), the DC-DC conversion unit 210 responds to the first signal (charging signal) sent by the charging and discharging signal generation module 310 of the main control module 300, turning on the first power switch unit 2111. Current flows from the power supply 110 through the energy storage unit 212, and the energy storage unit 212 begins to store energy. At this time, due to the action of the logic inverter 2113, the second power switch unit 2112 is in the off state. Therefore, the current will not flow directly from the battery 220 in reverse. When the first power switch unit 2111 is off, the energy stored in the energy storage unit 212 is released through the second diode D2 to charge the rechargeable battery 220. By adjusting the pulse width modulation (PWM) duty cycle of the first signal, the conduction time of the first power switch unit 2111 can be controlled, thereby adjusting the voltage and current output from the DC-DC conversion unit 210 to the battery 220, ensuring that the rechargeable battery 220 is charged with appropriate current and voltage.

[0101] When the magnetic levitation bearing control system requires the rechargeable battery 220 to provide power, the DC-DC conversion unit 210 responds to the second signal (discharge signal) sent by the charge / discharge signal generation module 310 of the main control module 300, causing the second power switch unit 2112 to turn on. Current flows from the rechargeable battery 220 to the energy storage unit 212, which stores the energy of the rechargeable battery 220. Under the action of the second signal, the first power switch unit 2111 closes to prevent the current from flowing directly back to the rechargeable battery 220. When the second power switch unit 2112 turns off, the energy stored in the energy storage unit 212 is released through the first diode D1, and the current flows to the system load (magnetic levitation bearing control module 100). The energy of the rechargeable battery 220 is boosted and supplied to the magnetic levitation bearing control module 100.

[0102] With this configuration, the battery management module 200 can provide power to the system when needed and store electrical energy when the system voltage is excessive. This not only improves the system's energy management efficiency but also avoids the economic loss that might result from the magnetic levitation bearing falling off if the power supply 110 suddenly loses power.

[0103] The magnetic levitation bearing control system provided in this embodiment has at least the following advantages:

[0104] Improved energy efficiency: By storing excess energy from the magnetic levitation bearings in batteries, energy waste can be reduced. This is especially beneficial during compressor frequency reduction and increase, allowing for more efficient energy allocation.

[0105] Accelerated system response time: During frequency reduction, the battery charges and absorbs excess energy, thereby accelerating the system's frequency reduction speed. During frequency ramp-up startup, the battery discharges to provide additional energy to the magnetic levitation bearing system, shortening the startup time and making the magnetic levitation bearing start-up faster and smoother.

[0106] Enhancing system reliability: The battery, acting as an uninterruptible power supply (UPS), continuously powers the system in the event of a sudden power outage, ensuring stable control of the magnetic levitation bearing and preventing system failures caused by sudden power outages. The battery also ensures that more fault data can be saved, facilitating subsequent diagnosis and maintenance.

[0107] Reduced hardware cost and size: Integrating magnetic bearing control and battery control into a unified control topology not only reduces the number of independent hardware components required by the system, but also reduces the size of the hardware, thereby reducing the overall system cost.

[0108] In summary, this technical solution achieves efficient energy management by integrating the magnetic levitation bearing control module and the battery management module.

[0109] Optionally, this embodiment also provides a refrigeration device (not shown), which includes the magnetic levitation bearing control system provided in this embodiment, improving the dynamic performance and reliability of the refrigeration device while reducing the hardware cost and energy consumption of the system.

[0110] When applied to refrigeration equipment, the compressor can start more quickly because the battery management module and the power supply can simultaneously power the magnetic levitation bearing. Furthermore, the compressor's operating frequency adjusts according to current refrigeration demand, and the rotational speed of the magnetic levitation bearing changes accordingly. The magnetic levitation bearing control system provided in this application can charge the battery management module when the bearing decelerates and discharge it when the bearing accelerates, thereby assisting the power supply in controlling the magnetic levitation bearing. This design not only makes the refrigeration equipment respond faster but also makes full use of energy and reduces energy loss.

[0111] Optionally, such as Figure 8 As shown, this embodiment also provides a control method for a magnetic levitation bearing, including the following steps:

[0112] Detect the power supply voltage of the magnetic levitation bearing;

[0113] If the supply voltage is excessive, use the supply voltage to charge the UPS power supply; and

[0114] If the power supply voltage is insufficient, use a UPS power supply.

[0115] This magnetic levitation bearing control method, through intelligent power management combined with power supply voltage detection and the use of a UPS (uninterruptible power supply), brings the following technical benefits:

[0116] Improve system stability and reliability:

[0117] By monitoring the power supply voltage of the magnetic levitation bearing and switching to the UPS power supply in a timely manner when the voltage is insufficient, the system can continue to operate stably even when there are voltage fluctuations or external power failures. This redundant power supply scheme effectively avoids equipment downtime or failure due to power interruptions, thus improving the reliability of the system.

[0118] Optimize energy efficiency:

[0119] When there is excess voltage, charging the UPS power supply can prevent power waste and ensure that the UPS power supply has sufficient power when needed. This dynamic power management not only saves energy but also makes rational use of resources when the grid supply is sufficient, improving overall energy efficiency.

[0120] Extend equipment life:

[0121] Because the system can automatically switch to UPS power supply in the event of unstable or low power supply, it avoids potential damage to the equipment caused by operating under low voltage conditions and extends the service life of the equipment.

[0122] Improve the system's emergency response capabilities:

[0123] The automatic switching of UPS power supplies enables magnetic levitation bearing systems to continue operating normally during power outages or voltage fluctuations, providing emergency handling capabilities. This is especially important in critical systems or continuously operating refrigeration equipment, preventing system paralysis due to sudden power outages.

[0124] Reduce maintenance and downtime:

[0125] The system does not require manual switching or shutdown for repairs when there is a power supply failure, which reduces downtime and maintenance work caused by power problems, thereby improving the system's operating efficiency.

[0126] In summary, this control method ensures the stable and efficient operation of the magnetic levitation bearing system through reasonable power management and power switching, thereby improving the system's reliability, energy efficiency, and service life.

[0127] The technical solution of the present invention has now been described in conjunction with the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to the specific embodiments described above. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions resulting from such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A magnetic levitation bearing control system, characterized in that, include: A magnetic levitation bearing control module is configured to control the magnetic levitation bearing; The battery management module is electrically connected to the magnetic levitation bearing control module; as well as The main control module is connected to both the magnetic levitation bearing control module and the battery management module. It can control the battery management module to store the electrical energy of the magnetic levitation bearing control module when the voltage of the magnetic levitation bearing control module is excessive, and to supply power to the magnetic levitation bearing control module when the power supply is insufficient.

2. The magnetic levitation bearing control system according to claim 1, characterized in that, The overall control module includes: The charge / discharge signal generation module is connected to the control terminal of the battery management module. It can send corresponding control signals to control the charging / discharging of the battery management module based on the signal characterizing the input voltage of the magnetic levitation bearing control module as excessive / insufficient.

3. The magnetic levitation bearing control system according to claim 2, characterized in that, The overall control module also includes: The voltage judgment module is connected to the magnetic levitation bearing control module and the charge / discharge signal generation module. It can determine whether the input voltage of the magnetic levitation bearing control module is excessive or insufficient based on the electrical signal characterizing the input voltage of the magnetic levitation bearing control module.

4. The magnetic levitation bearing control system according to any one of claims 1-3, characterized in that, The overall control module also includes: A magnetic levitation bearing control signal generation module is connected to the magnetic levitation bearing control module, and it can send corresponding control signals based on the operating status of the magnetic levitation bearing.

5. The magnetic levitation bearing control system according to any one of claims 1-3, characterized in that, The battery management module includes: Rechargeable batteries; and The DC-DC conversion unit is connected to the magnetic levitation bearing control module, the main control module, and the rechargeable battery. It can respond to the control signal of the main control module and convert the charging voltage and the discharging voltage of the rechargeable battery input from the magnetic levitation bearing control module to the rechargeable battery, so that the charging voltage and the discharging voltage are adapted to the battery management module and the magnetic levitation bearing control module.

6. The magnetic levitation bearing control system according to claim 5, characterized in that, The DC-DC conversion unit includes: An energy storage unit is capable of temporarily storing the charging energy of the magnetic levitation bearing control module and the discharging energy of the rechargeable battery; and The logic switch unit, connected to the main control module and the energy storage unit, is capable of storing energy in the energy storage unit by means of a switch control when the main control module sends a signal indicating that the voltage of the magnetic levitation bearing control module is excessive, and releasing the energy stored in the energy storage unit by means of a switch control when the main control module sends a signal indicating that the voltage of the magnetic levitation bearing control module is insufficient.

7. The magnetic levitation bearing control system according to claim 6, characterized in that, The logic switching unit includes: The first power switching unit has its drain connected to the positive terminal of the power supply of the magnetic levitation bearing control module, its gate connected to the first terminal of the energy storage unit, and its source connected to the main control module. The second power switching unit has its drain connected to the first terminal of the energy storage unit, its gate connected to the negative terminal of the power supply of the rechargeable battery and the magnetic levitation bearing control module, and its source connected to the output terminal of the logic inverter; and The input terminal of the logic inverter is connected to the main control module.

8. The magnetic levitation bearing control system according to claim 6, characterized in that, The energy storage unit is an inductor.

9. A refrigeration device, characterized in that, The magnetic levitation bearing control system includes any one of claims 1-8.

10. A control method for a magnetic levitation bearing, characterized in that, Including the following steps: Detect the power supply voltage of the magnetic levitation bearing; If the supply voltage is excessive, then use the supply voltage to charge the UPS power supply; and If the supply voltage is insufficient, the UPS power supply will be used.

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