CN112713644B - Power supply control device and method of bearing controller and magnetic suspension system - Google Patents

Power supply control device and method of bearing controller and magnetic suspension system Download PDF

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Publication number
CN112713644B
CN112713644B CN202011458624.XA CN202011458624A CN112713644B CN 112713644 B CN112713644 B CN 112713644B CN 202011458624 A CN202011458624 A CN 202011458624A CN 112713644 B CN112713644 B CN 112713644B
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China
Prior art keywords
power supply
bearing
controller
bearing controller
power
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CN202011458624.XA
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Chinese (zh)
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CN112713644A (en
Inventor
赵子静
贺永玲
王凡
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN202011458624.XA priority Critical patent/CN112713644B/en
Publication of CN112713644A publication Critical patent/CN112713644A/en
Priority to PCT/CN2021/109007 priority patent/WO2022121332A1/en
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406—Magnetic bearings
    • F16C32/044—Active magnetic bearings
    • F16C32/0444—Details of devices to control the actuation of the electromagnets
    • F16C32/0451—Details of controllers, i.e. the units determining the power to be supplied, e.g. comparing elements, feedback arrangements with P.I.D. control
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N15/00—Holding or levitation devices using magnetic attraction or repulsion, not otherwise provided for

Abstract

The invention discloses a power supply control device and method of a bearing controller and a magnetic suspension system, wherein the device comprises the following components: the device comprises a redundant power supply, a switch module and a power management module, wherein the switch module is connected with the redundant power supply; the power management module is used for collecting output voltage and fault signals of the redundant power supply, collecting working states of the bearings controlled by the bearing controllers and collecting direct current bus voltage of the controllers of the motors corresponding to the bearing controllers; and controlling the switch of the switch module and controlling the running state of the motor corresponding to the bearing controller according to the output voltage and fault signals of the redundant power supply, the bearing suspension state of the bearing controlled by the bearing controller and the direct current bus voltage of the controller of the motor corresponding to the bearing controller. According to the scheme, the redundant power supply modes of the AC-DC power supply and the DC-DC power supply are controlled, so that the magnetic suspension bearing which normally operates can be prevented from being damaged due to falling caused by power supply faults.

Description

Power supply control device and method of bearing controller and magnetic suspension system
Technical Field
The invention belongs to the technical field of magnetic suspension systems, and particularly relates to a power supply control device and method of a bearing controller and a magnetic suspension system, in particular to a power supply control device of a magnetic suspension bearing controller, a magnetic suspension system with the power supply control device of the magnetic suspension bearing controller and a power supply control method of the bearing controller.
Background
In the power supply design of the magnetic suspension bearing system, one of the most critical reliability problems to be solved is how to prevent the magnetic suspension bearing which is normally operated from falling and being damaged due to the power supply failure.
The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.
Disclosure of Invention
The invention aims to provide a power supply control device, a method and a magnetic suspension system of a bearing controller, which are used for solving the problem that a magnetic suspension bearing in normal operation is damaged due to the failure of a power supply, and achieving the effect that the magnetic suspension bearing in normal operation is damaged due to the failure of the power supply by controlling the redundant power supply modes of an AC-DC power supply and a DC-DC power supply.
The invention provides a power supply control device of a bearing controller, comprising: the device comprises a redundant power supply, a switch module and a power management module, wherein the switch module is connected with the redundant power supply; the power management module is configured to collect output voltage and fault signals of the redundant power supply, collect working states of the bearings controlled by the bearing controller and collect direct current bus voltage output by the motor controller to the bearing controller; and controlling the switch of the switch module and controlling the running state of the motor corresponding to the bearing controller according to the output voltage and fault signals of the redundant power supply, the bearing suspension state of the bearing controlled by the bearing controller and the direct current bus voltage output to the bearing controller by the motor controller.
In some embodiments, the redundant power supply includes: an AC-DC power supply and a DC-DC power supply; the AC-DC power supply is arranged between the alternating current power supply and the bearing controller; the DC-DC power supply is arranged between a direct current bus of a controller of the motor corresponding to the bearing controller and the bearing controller; the switch module is arranged between the alternating current power supply and the AC-DC power supply and is positioned at the front end of an scram switch in a controller of the motor corresponding to the bearing controller.
In some embodiments, the power management module is capable of communicating with the AC-DC power source, a controller of a motor to which the bearing controller corresponds, the DC-DC power source, and the bearing controller.
In some embodiments, further comprising: a first unidirectional module and a second unidirectional module; the first unidirectional module is arranged between the AC-DC power supply and the bearing controller to limit the AC-DC power supply to supply power to the bearing controller in one direction; the second unidirectional module is arranged between the DC-DC power supply and the bearing controller to limit the DC-DC power supply to supply power to the bearing controller in a unidirectional mode.
In some embodiments, the power management module controls switching of the switching module, including: controlling the switch module to be switched on under the condition that the voltage of a direct current bus output by the motor controller to the bearing controller is in a set voltage range, so that the AC-DC power supply and the DC-DC power supply are connected in parallel to supply power to the bearing controller; under the condition that an alternating current power supply is powered down, the switch module is controlled to be kept closed, and the energy of a motor corresponding to the bearing controller is fed back and is used for supplying power to the bearing controller through the DC-DC power supply; under the condition that a motor corresponding to the bearing controller is in emergency stop, the emergency stop switch is disconnected, the energy of the motor corresponding to the bearing controller is fed back and is used for supplying power to the bearing controller through the DC-DC power supply, and the AC-DC power supply is also used for supplying power to the bearing controller so that the bearing controller can continue to work; under the condition that the control bearing of the bearing controller is a magnetic suspension bearing, the bearing controller continues to work until the control bearing of the bearing controller stops floating; and under the condition that the bearing controlled by the bearing controller is a magnetic suspension bearing, if the magnetic suspension bearing stops floating and a sudden stop switch in a controller of a motor corresponding to the bearing controller is disconnected, the switch module is controlled to be disconnected.
In some embodiments, the power management module controls an operation state of a motor corresponding to the bearing controller, including: and under the condition that at least one of the AC-DC power supply and the DC-DC power supply fails, controlling the motor corresponding to the bearing controller to stop.
In accordance with another aspect of the present invention, there is provided a magnetic levitation system comprising: the power supply control device of the bearing controller is described above.
In accordance with the present invention, there is provided a method for controlling power supply to a bearing controller, comprising: the power management module is configured to collect output voltage and fault signals of a redundant power supply of the bearing controller, collect working states of the bearing controlled by the bearing controller and collect direct current bus voltage output by the motor controller to the bearing controller; and controlling the switch of the switch module and controlling the running state of the motor corresponding to the bearing controller according to the output voltage and fault signals of the redundant power supply, the bearing suspension state of the bearing controlled by the bearing controller and the direct current bus voltage output to the bearing controller by the motor controller.
In some embodiments, the redundant power supply includes: an AC-DC power supply and a DC-DC power supply; the AC-DC power supply is arranged between the alternating current power supply and the bearing controller; the DC-DC power supply is arranged between a direct current bus of a controller of the motor corresponding to the bearing controller and the bearing controller; the switch module is arranged between the alternating current power supply and the AC-DC power supply and is positioned at the front end of an scram switch in a controller of the motor corresponding to the bearing controller.
In some embodiments, controlling, by a power management module, switching of the switching module includes: controlling the switch module to be switched on under the condition that the voltage of a direct current bus output by the motor controller to the bearing controller is in a set voltage range, so that the AC-DC power supply and the DC-DC power supply are connected in parallel to supply power to the bearing controller; under the condition that an alternating current power supply is powered down, the switch module is controlled to be kept closed, and the energy of a motor corresponding to the bearing controller is fed back and is used for supplying power to the bearing controller through the DC-DC power supply; under the condition that a motor corresponding to the bearing controller is in emergency stop, the emergency stop switch is disconnected, the energy of the motor corresponding to the bearing controller is fed back and is used for supplying power to the bearing controller through the DC-DC power supply, and the AC-DC power supply is also used for supplying power to the bearing controller so that the bearing controller can continue to work; under the condition that the control bearing of the bearing controller is a magnetic suspension bearing, the bearing controller continues to work until the control bearing of the bearing controller stops floating; and under the condition that the bearing controlled by the bearing controller is a magnetic suspension bearing, if the magnetic suspension bearing stops floating and a sudden stop switch in a controller of a motor corresponding to the bearing controller is disconnected, the switch module is controlled to be disconnected.
In some embodiments, the controlling, by the power management module, the running state of the motor corresponding to the bearing controller includes: and under the condition that at least one of the AC-DC power supply and the DC-DC power supply fails, controlling the motor corresponding to the bearing controller to stop.
Therefore, according to the scheme of the invention, the switch is arranged at the front end of the scram switch of the frequency converter so as to control the switch of the AC-DC power supply; and the AC-DC power supply, the DC-DC power supply frequency converter and the bearing controller are managed through the power supply management module, so that the redundant power supply modes of the AC-DC power supply and the DC-DC power supply are controlled, and the magnetic suspension bearing which normally operates can be prevented from falling and being damaged due to the power supply failure.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a schematic diagram of a power control device of a bearing controller according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an embodiment of a magnetic bearing power supply system;
FIG. 3 is a schematic diagram of a magnetic bearing power supply system according to an embodiment of the present invention;
FIG. 4 is a control flow diagram of an embodiment of a bearing power supply system according to the present invention;
FIG. 5 is a control flow diagram of an embodiment of a power management module according to the present invention.
FIG. 6 is a flow chart of an embodiment of a method for controlling power to a bearing controller according to the present invention;
fig. 7 is a schematic flow chart of an embodiment of controlling the switch of the switch module in the method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
According to an embodiment of the present invention, there is provided a power supply control device of a bearing controller. Referring to fig. 1, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The power supply control device of the bearing controller may include: redundant power supplies, a switch module (e.g., switch K), and a power management module. The power management module is capable of communicating with the redundant power supply, the bearing controller and the motor to which the bearing controller belongs.
The power management module is configured to collect output voltage and fault signals of the redundant power supply, collect working states of the bearing controlled by the bearing controller, and collect direct current bus voltage output by the motor controller to the bearing controller. The method comprises the steps of,
the power management module is further configured to control the switch of the switch module and control the running state of the motor corresponding to the bearing controller according to the output voltage and fault signals of the redundant power supply, the bearing suspension state of the bearing controlled by the bearing controller and the direct current bus voltage output to the bearing controller by the motor controller.
Therefore, the switch of the switch module is controlled according to the output voltage and fault signals of the redundant power supply and the bearing suspension state of the bearing controlled by the bearing controller, and the motor to which the bearing controller belongs is controlled to stop under the condition that the redundant power supply fails, so that the power supply reliability is improved, and the reliability and the safety of the power supply of the bearing controller under any conditions such as emergency stop and external power supply failure are ensured; the problems of reliability and safety of the power supply of the bearing controller under any conditions of emergency stop of the compressor, failure of external power supply and the like are solved, and the technical effect of providing the reliability of the power supply of the bearing controller is further achieved.
In some embodiments, the redundant power supply includes: an AC-DC power supply and a DC-DC power supply. The AC-DC power supply is arranged between an alternating current power supply and the bearing controller. The DC-DC power supply is arranged between a direct current bus of a controller of the motor corresponding to the bearing controller and the bearing controller. The switch module is arranged between the alternating current power supply and the AC-DC power supply and is positioned at the front end of the scram switch in the controller of the motor corresponding to the bearing controller (namely positioned at one end of the scram switch close to the alternating current power supply in the controller of the motor corresponding to the bearing controller). And the bearing controller corresponds to a controller of the motor, such as a frequency converter. A frequency converter, comprising: scram switch S, three-phase rectifier bridge and three-phase inverter. And the power management module is respectively connected with the AC-DC power supply, the DC-DC power supply, the bearing controller and the frequency converter. The alternating current input by the power grid is connected to the motor through the emergency stop switch S, the three-phase rectifier bridge and the three-phase inverter bridge.
Specifically, the magnetic suspension bearing controller power supply system is provided by connecting an AD-DC power supply and a DC-DC power supply in parallel, a power supply management module is added, one path of controllable switch K is positioned at the front end of a frequency converter emergency stop switch S, and the AC-DC power supply is used for taking power from the mains supply through opening and closing of the controllable switch K. The emergency stop switch S of the motor is arranged at the rear end of the controllable switch K, and the design ensures that when the motor is in high-speed running and suddenly power-off or suddenly stops braking, even if the power supply device cannot supply power to the bearing controller through energy feedback, the AC-DC power supply can also supply power to the bearing controller, so that the problem that the bearing falls and is damaged due to abnormal power supply of the bearing controller caused by DC-DC power failure is avoided.
In some embodiments, the power management module is capable of communicating with the AC-DC power source, a controller of a motor to which the bearing controller corresponds, the DC-DC power source, and the bearing controller.
Specifically, the power management module is respectively communicated with the AC-DC power supply, the DC-DC power supply, the bearing controller and the motor, wherein the power management module reads output voltages of the AC-DC power supply and the DC-DC power supply, fault signals and bearing suspension states detected by the bearing controller in real time, controls the controllable switch K on the condition of the output voltages and fault signals and the bearing suspension states, and sends a stall instruction to the motor through communication when the AC-DC power supply or the DC-DC power supply fails to stop rotating.
In some embodiments, further comprising: first unidirectional module (e.g. diode D 1 ) And a second unidirectional module (e.g. diode D 2 )。
The first unidirectional module is arranged between the AC-DC power supply and the bearing controller to limit the AC-DC power supply to supply power to the bearing controller in one direction.
The second unidirectional module is arranged between the DC-DC power supply and the bearing controller to limit the DC-DC power supply to supply power to the bearing controller in a unidirectional mode.
Specifically, the magnetic bearing switch power supply device mainly comprises a power supply management module, an AC-DC power supply, a DC-DC power supply, a frequency converter, a magnetic bearing, a controller and a rectifier diode D 1 D (D) 2 The controllable switch K, the emergency stop switch S and the like.
In some embodiments, the power management module controls the switch of the switch module according to the output voltage and fault signal of the redundant power supply, the bearing suspension state of the bearing controlled by the bearing controller, and the dc bus voltage output to the bearing controller by the motor controller, and includes:
the power management module is specifically configured to control the switch module to be turned on under the condition that the voltage of the direct current bus output by the motor controller to the bearing controller is within a set voltage range, so that the AC-DC power supply and the DC-DC power supply are connected in parallel to supply power to the bearing controller.
Specifically, an AC-DC power supply is introduced from alternating current through a normally closed controllable switch K. The switch K is turned off according to the control instruction sent by the power management module. When the voltage of the direct current bus of the frequency converter is normal: the magnetic suspension bearing system works normally, the motor controller is in a forward driving state, and the motor operates normally and stably. At the moment, the voltage of the direct current bus is stable, the voltage value Ub of the direct current bus is in the allowable input range of the DC-DC power supply, and the direct current bus voltage is directly supplied to the DC-DC power supply for controlling the magnetic suspension bearing. At the same time, the power management module ensures that switch K is closed. After the switch K is closed, the external alternating current commercial power supplies power to the AC-DC power supply. Therefore, the power supply voltage of the bearing controller is provided by the AD-DC power supply and the DC-DC power supply in parallel, so that a redundant power supply device is formed.
The power management module is specifically configured to control the switch module to be kept closed under the condition that the alternating current power supply is powered down, and the energy of the motor corresponding to the bearing controller is fed back and the bearing controller is powered through the DC-DC power supply.
Specifically, in the case where the power supply voltage of the bearing controller is supplied by the AD-DC power supply in parallel with the DC-DC power supply, when the external utility power supply is powered down: the power management module keeps the switch K closed, and the motor energy feedback supplies power to the bearing controller through a DC-DC power supply.
The power management module is specifically configured to disconnect the emergency stop switch under the condition that a motor corresponding to the bearing controller is in emergency stop, the energy of the motor corresponding to the bearing controller is fed back and is used for supplying power to the bearing controller through the DC-DC power supply, and the AC-DC power supply is also used for supplying power to the bearing controller so that the bearing controller can continue to work. And under the condition that the control bearing of the bearing controller is a magnetic suspension bearing, the bearing controller continues to work until the control bearing of the bearing controller stops floating.
Specifically, in the case where the power supply voltage of the bearing controller is supplied by the AD-DC power supply in parallel with the DC-DC power supply, when the motor is emergency-stopped: the scram switch S is turned off, and the ac input of the inverter is powered off. If the DC-DC power supply works normally at this time, the DC-DC power supply can directly take electricity from the DC bus voltage according to the energy feedback path, and can also directly take electricity from the AC-DC power supply, so as to maintain the magnetic suspension bearing to work continuously until the magnetic suspension bearing stops floating. If the DC-DC power supply fails or the energy feedback fails, the normal work of the magnetic suspension bearing is maintained through the voltage output by the AC-DC power supply. The motor can still keep the shaft suspended until the shaft stops rotating under the condition of sudden power failure when the motor runs at a high speed, and the damage of the whole system is avoided.
The power management module is specifically configured to control the switch module to be disconnected if the magnetic suspension bearing is stopped and a scram switch in a controller of a motor corresponding to the bearing controller is disconnected under the condition that the bearing controlled by the bearing controller is the magnetic suspension bearing.
Specifically, under the condition that the power supply voltage of the bearing controller is provided by the AD-DC power supply and the DC-DC power supply in parallel, when the power supply management module detects that the magnetic suspension bearing is stopped and the scram switch S is disconnected, a disconnection instruction is sent to control the switch K to be disconnected, so that the bearing controller is powered off, and the controller is prevented from being powered on for a long time.
In some embodiments, the power management module controls an operation state of a motor corresponding to the bearing controller (i.e. controls a motor to which the bearing controller belongs to stop when the redundant power supply fails) according to an output voltage and a fault signal of the redundant power supply, a bearing suspension state of a bearing controlled by the bearing controller, and a dc bus voltage output to the bearing controller by the motor controller, and includes: and under the condition that at least one of the AC-DC power supply and the DC-DC power supply fails, controlling the motor corresponding to the bearing controller to stop.
Specifically, when the power management module receives the fault information of the AC-DC power supply or the DC-DC power supply, a motor stopping instruction is immediately sent, so that the motor stops rotating, and the reliability of the system is further improved.
Through a large number of experiments, the technical scheme of the invention is adopted, and the switch is arranged at the front end of the scram switch of the frequency converter so as to control the switch of the AC-DC power supply; and the AC-DC power supply, the DC-DC power supply frequency converter and the bearing controller are managed through the power supply management module, so that the redundant power supply modes of the AC-DC power supply and the DC-DC power supply are controlled, and the magnetic suspension bearing which normally operates can be prevented from falling and being damaged due to the power supply failure.
According to an embodiment of the present invention, there is also provided a magnetic levitation system corresponding to the power supply control device of the bearing controller. The magnetic levitation system may include: the power supply control device of the bearing controller is described above.
In some schemes, multiple redundant power supply devices of the magnetic suspension bearing are matched with a frequency converter and a power uninterrupted switching device to realize multiple redundant power supply of the electromagnetic bearing. However, this solution has some drawbacks, such as: firstly, the uninterrupted switching state of the power supply is complex, and the control difficulty is high; secondly, the UPS power supply increases the system cost, and the battery has a limited service life and needs to be replaced regularly.
FIG. 2 is a schematic diagram of an embodiment of a magnetic bearing power supply system. As shown in fig. 2, the magnetic bearing power supply system includes: three-phase rectifier bridge, three-phase inverter bridge, DC-DC power supply, AC-DC power supply, bearing controller and diode D 1 And diode D 2 . The alternating current input by the power grid is connected to the motor after passing through the three-phase rectifier bridge and the three-phase inverter bridge. The bus voltage output by the three-phase rectifier bridge is also connected to the bearing after passing through the DC-DC power supply and the bearing controller. The alternating current input by the power grid is also connected to the bearing after passing through the AC-DC power supply and the bearing controller. Diode D 1 A diode D arranged between the anode of the AC-DC power supply and the bearing controller 2 And the bearing controller is arranged between the anode of the DC-DC power supply and the bearing controller.
In other embodiments, the bearing power supply system is composed of an AC-DC power source and a DC-DC power source, as shown in fig. 2. Although the scheme can provide redundancy protection for the magnetic suspension bearing, the scheme also has the following defects: when the external power supply is normal, the bearing controller cannot be powered off, the loss is high, certain potential safety hazards exist, and the risk is high; when the motor is in emergency stop, the AC-DC power supply is powered down, and if the energy feedback is invalid or the DC-DC power supply is damaged at the moment, the risk is high.
In some embodiments, in order to further improve the safety and reliability of the system, the invention provides a magnetic bearing power supply system and a control method, which solve the problem that the magnetic bearing falls down and is damaged due to energy feedback failure or DC-DC power failure under the emergency stop condition; the problems that the AC-DC power supply cannot be powered off under the condition of normal external power supply, loss is high and certain potential safety hazard exists are solved.
In some embodiments, the magnetic bearing switching power supply device provided by the scheme of the invention mainly comprises a power management module, an AC-DC power supply, a DC-DC power supply, a frequency converter, a magnetic bearing, a controller and a rectifier diode D 1 D (D) 2 The controllable switch K, the emergency stop switch S and the like.
The power management module is respectively communicated with the AC-DC power supply, the DC-DC power supply, the bearing controller and the motor, wherein the power management module reads output voltages of the AC-DC power supply and the DC-DC power supply, fault signals and bearing suspension states detected by the bearing controller in real time, controls the controllable switch K on the condition of the output voltages and fault signals and the bearing suspension states, and sends a stall instruction to the motor through communication when the AC-DC power supply or the DC-DC power supply fails to enable the motor to stop rotating.
In addition, in the scheme of the invention, the emergency stop switch S of the motor is arranged at the rear end of the controllable switch K, and the design ensures that when the motor is in high-speed running and suddenly power-off or suddenly stops braking, even if the power supply device cannot supply power to the bearing controller through energy feedback, the AC-DC power supply can also supply power to the bearing controller, so that the problem that the bearing falls and is damaged due to abnormal power supply of the bearing controller caused by DC-DC power supply faults is avoided.
In this way, the power supply system and the control method provided by the scheme of the invention are covered and matched with the controllable switch K and the power supply management module, so that the power supply reliability is improved, and the reliability and the safety of the power supply of the bearing controller are ensured under any conditions such as emergency stop, external power supply failure and the like; the problems of reliability and safety of the power supply of the bearing controller under any conditions of emergency stop of the compressor, failure of external power supply and the like are solved, and the technical effect of providing the reliability of the power supply of the bearing controller is further achieved.
Fig. 3 is a schematic structural diagram of an embodiment of a magnetic bearing power supply system according to the present invention. As shown in fig. 3, the frequency converter, the switch K, AC-DC power supply, the DC-DC power supply, the power management module, the diode D 1 Diode D 2 And a power management module. A frequency converter, comprising: scram switch S, three-phase rectifier bridge and three-phase inverter. And the power management module is respectively connected with the AC-DC power supply, the DC-DC power supply, the bearing controller and the frequency converter. The alternating current input by the power grid is connected to the motor through the emergency stop switch S, the three-phase rectifier bridge and the three-phase inverter bridge. The alternating current input by the power grid is also connected to the bearing after passing through the switch K, AC-DC power supply and the bearing controller. The power management module is also connected to the switch K, and the power management module is also connected to a power line between the AC-DC power supply and the bearing controller. The power line between the three-phase rectifier bridge and the three-phase inverter bridge is connected to the bearing controller through a DC-DC power supply. Diode D 1 A diode D arranged between the anode of the AC-DC power supply and the bearing controller 2 And the bearing controller is arranged between the anode of the DC-DC power supply and the bearing controller.
In the example shown in fig. 3, the magnetic bearing controller power supply system is provided by connecting an AD-DC power supply and a DC-DC power supply in parallel, adding a power management module, adding a controllable switch K, wherein the controllable switch K is positioned at the front end of the frequency converter scram switch S, and the AC-DC power supply takes power from the mains supply through the opening and closing of the controllable switch K.
In this way, by the power supply system and the control method provided by the scheme of the invention, the AC-DC power supply is powered on from the front end of the frequency converter scram switch S through the switch K, so that the problem that the bearing falls down and is damaged due to the DC-DC power supply fault under the condition of scram or sudden power failure of the high-speed operation of the motor is avoided, and the reliability of the system is improved; and the problem that the AC-DC power supply and the bearing controller cannot be powered off when the external commercial power is normal is avoided by controlling the switch K, so that the safety is improved.
Fig. 4 is a control flow diagram of an embodiment of the bearing power supply system of the present invention.
The AC-DC power is introduced from the AC power through a normally closed controllable switch K. The switch K is turned off according to the control command sent by the power management module, and the specific implementation flow is shown in FIG. 4. As shown in fig. 4, the control flow of the bearing power supply system includes:
step 1, under the condition that a magnetic suspension system is electrified, judging whether the direct current bus voltage of a frequency converter is normal, and if so, executing step 2; if not, the energy of the motor is fed back to the DC-DC power supply.
Step 2, when the voltage of the direct current bus of the frequency converter is normal (the voltage of the direct current bus of the frequency converter is about 315V and is normal): the magnetic suspension bearing system works normally, the motor controller is in a forward driving state, and the motor operates normally and stably. At the moment, the voltage of the direct current bus is stable, the voltage value Ub of the direct current bus is in the allowable input range of the DC-DC power supply, and the direct current bus voltage is directly supplied to the DC-DC power supply for controlling the magnetic suspension bearing.
At the same time, the power management module ensures that switch K is closed. As can be seen from fig. 3, the AC-DC power supply is supplied by the external AC mains after the switch K is closed. Therefore, the power supply voltage of the bearing controller is provided by the AD-DC power supply and the DC-DC power supply in parallel, so that a redundant power supply device is formed.
Step 3, when the power supply voltage of the bearing controller is provided by the AD-DC power supply and the DC-DC power supply in parallel, and the external commercial power supply is powered down: the power management module keeps the switch K closed, and the motor energy feedback supplies power to the bearing controller through a DC-DC power supply. When the external commercial power is supplied and the power is lost, the motor controller is powered off.
Step 4, in the case that the power supply voltage of the bearing controller is provided by the AD-DC power supply and the DC-DC power supply in parallel, when the motor is in emergency stop: the scram switch S is turned off, and the ac input of the inverter is powered off. When the motor is in emergency stop, an emergency stop switch can be beaten.
If the DC-DC power supply works normally at this time, the DC-DC power supply can directly take electricity from the DC bus voltage according to the energy feedback path, and can also directly take electricity from the AC-DC power supply, so as to maintain the magnetic suspension bearing to work continuously until the magnetic suspension bearing stops floating.
If the DC-DC power supply fails or the energy feedback fails, the normal work of the magnetic suspension bearing is maintained through the voltage output by the AC-DC power supply. The motor can still keep the shaft suspended until the shaft stops rotating under the condition of sudden power failure when the motor runs at a high speed, and the damage of the whole system is avoided.
And 5, under the condition that the power supply voltage of the bearing controller is provided by the AD-DC power supply and the DC-DC power supply in parallel, when the power supply management module detects that the magnetic suspension bearing is stopped and the scram switch S is disconnected, the disconnection instruction is sent to control the switch K to be disconnected, so that the bearing controller is powered off, and the controller is prevented from being powered on for a long time, and the example shown in fig. 5 can be seen. The magnetic suspension bearing controller and the motor frequency converter can respectively send the bearing suspension state and the on-off state of the scram switch S to the power management module in real time according to communication.
In addition, when the power management module receives the failure information of the AC-DC power supply or the DC-DC power supply, a motor stopping command is immediately sent to stop the motor from rotating, so that the reliability of the system is further improved, and the example shown in fig. 5 can also be seen. The power management module receives fault information of the AC-DC power supply or the DC-DC power supply in real time according to communication.
Since the processing and functions implemented by the magnetic levitation system of the present embodiment basically correspond to the embodiment, principle and example of the apparatus shown in fig. 1, the description of the present embodiment is not exhaustive, and reference may be made to the related description of the foregoing embodiment, which is not repeated herein.
Through a large number of experiments, the technical scheme of the invention is adopted, and the switch is arranged at the front end of the scram switch of the frequency converter so as to control the switch of the AC-DC power supply; and the AC-DC power supply, the DC-DC power supply frequency converter and the bearing controller are managed through the power supply management module, so that the redundant power supply modes of the AC-DC power supply and the DC-DC power supply are controlled, the problem that the magnetic suspension bearing is dropped and damaged due to energy feedback failure or DC-DC power supply failure under the condition of emergency stop is solved, and the power supply reliability of the magnetic suspension system is improved.
There is further provided, in accordance with an embodiment of the present invention, a method of controlling power to a bearing controller of a magnetic levitation system, as illustrated in fig. 6, which is a schematic flow chart of an embodiment of the method of the present invention. The power supply control method of the bearing controller may include: step S110 and step S120.
Step S110, through a power management module, is configured to collect output voltage and fault signals of redundant power supplies of the bearing controller, collect working states of bearings controlled by the bearing controller, and collect direct current bus voltage output by the motor controller to the bearing controller. The method comprises the steps of,
And step S120, controlling the switch of the switch module and controlling the running state of the motor corresponding to the bearing controller according to the output voltage and fault signals of the redundant power supply, the bearing suspension state of the bearing controlled by the bearing controller and the direct current bus voltage output to the bearing controller by the motor controller.
The redundant power supply, a switch module (such as a switch K) and a power management module are arranged, and the power management module can communicate with the redundant power supply, the bearing controller and a motor to which the bearing controller belongs. The switch of the switch module is controlled according to the output voltage and fault signals of the redundant power supply and the bearing suspension state of the bearing controlled by the bearing controller, and the motor to which the bearing controller belongs is controlled to stop under the condition that the redundant power supply fails, so that the power supply reliability is improved, and the reliability and the safety of the power supply of the bearing controller under any conditions such as emergency stop and external power supply failure are ensured; the problems of reliability and safety of the power supply of the bearing controller under any conditions of emergency stop of the compressor, failure of external power supply and the like are solved, and the technical effect of providing the reliability of the power supply of the bearing controller is further achieved.
In some embodiments, the redundant power supply includes: an AC-DC power supply and a DC-DC power supply. The AC-DC power supply is arranged between an alternating current power supply and the bearing controller. The DC-DC power supply is arranged between a direct current bus of a controller of the motor corresponding to the bearing controller and the bearing controller. The switch module is arranged between the alternating current power supply and the AC-DC power supply and is positioned at the front end of the scram switch in the controller of the motor corresponding to the bearing controller (namely positioned at one end of the scram switch close to the alternating current power supply in the controller of the motor corresponding to the bearing controller). And the bearing controller corresponds to a controller of the motor, such as a frequency converter. A frequency converter, comprising: scram switch S, three-phase rectifier bridge and three-phase inverter. And the power management module is respectively connected with the AC-DC power supply, the DC-DC power supply, the bearing controller and the frequency converter. The alternating current input by the power grid is connected to the motor through the emergency stop switch S, the three-phase rectifier bridge and the three-phase inverter bridge.
Specifically, the magnetic suspension bearing controller power supply system is provided by connecting an AD-DC power supply and a DC-DC power supply in parallel, a power supply management module is added, one path of controllable switch K is positioned at the front end of a frequency converter emergency stop switch S, and the AC-DC power supply is used for taking power from the mains supply through opening and closing of the controllable switch K. The emergency stop switch S of the motor is arranged at the rear end of the controllable switch K, and the design ensures that when the motor is in high-speed running and suddenly power-off or suddenly stops braking, even if a power supply method cannot supply power to the bearing controller through energy feedback, the AC-DC power supply can also supply power to the bearing controller, so that the problem that the bearing falls and is damaged due to abnormal power supply of the bearing controller caused by DC-DC power failure is avoided.
In some embodiments, the power management module in step S120 controls the switching of the switching module according to the output voltage and fault signal of the redundant power supply, the bearing suspension state of the bearing controlled by the bearing controller, and the dc bus voltage output to the bearing controller by the motor controller, which is described in the following exemplary embodiments.
The following is a schematic flow chart of an embodiment of the method of the present invention for controlling the switch of the switch module in connection with fig. 7, further describing a specific process for controlling the switch of the switch module in step S120, including: step S210 to step S240..
And step S210, when the voltage of the direct current bus outputted by the motor controller to the bearing controller is within a set voltage range, controlling the switch module to be turned on so that the AC-DC power supply and the DC-DC power supply are connected in parallel to supply power to the bearing controller.
Specifically, an AC-DC power supply is introduced from alternating current through a normally closed controllable switch K. The switch K is turned off according to the control instruction sent by the power management module. When the voltage of the direct current bus of the frequency converter is normal: the magnetic suspension bearing system works normally, the motor controller is in a forward driving state, and the motor operates normally and stably. At the moment, the voltage of the direct current bus is stable, the voltage value Ub of the direct current bus is in the allowable input range of the DC-DC power supply, and the direct current bus voltage is directly supplied to the DC-DC power supply for controlling the magnetic suspension bearing. At the same time, the power management module ensures that switch K is closed. After the switch K is closed, the external alternating current commercial power supplies power to the AC-DC power supply. Therefore, the power supply voltage of the bearing controller is provided by the AD-DC power supply and the DC-DC power supply in parallel, so that a redundant power supply method is formed.
And step S220, under the condition that the alternating current power supply is powered down, the switch module is controlled to be kept closed, and the energy of the motor corresponding to the bearing controller is fed back and the bearing controller is powered through the DC-DC power supply.
Specifically, in the case where the power supply voltage of the bearing controller is supplied by the AD-DC power supply in parallel with the DC-DC power supply, when the external utility power supply is powered down: the power management module keeps the switch K closed, and the motor energy feedback supplies power to the bearing controller through a DC-DC power supply.
Step S230, when the motor corresponding to the bearing controller is in emergency stop, the emergency stop switch is turned off, the energy of the motor corresponding to the bearing controller is fed back and is supplied to the bearing controller through the DC-DC power supply, and the AC-DC power supply also supplies power to the bearing controller, so that the bearing controller continues to work. And under the condition that the control bearing of the bearing controller is a magnetic suspension bearing, the bearing controller continues to work until the control bearing of the bearing controller stops floating.
Specifically, in the case where the power supply voltage of the bearing controller is supplied by the AD-DC power supply in parallel with the DC-DC power supply, when the motor is emergency-stopped: the scram switch S is turned off, and the ac input of the inverter is powered off. If the DC-DC power supply works normally at this time, the DC-DC power supply can directly take electricity from the DC bus voltage according to the energy feedback path, and can also directly take electricity from the AC-DC power supply, so as to maintain the magnetic suspension bearing to work continuously until the magnetic suspension bearing stops floating. If the DC-DC power supply fails or the energy feedback fails, the normal work of the magnetic suspension bearing is maintained through the voltage output by the AC-DC power supply. The motor can still keep the shaft suspended until the shaft stops rotating under the condition of sudden power failure when the motor runs at a high speed, and the damage of the whole system is avoided.
And step S240, if the bearing controlled by the bearing controller is a magnetic suspension bearing, and if the magnetic suspension bearing stops floating and a sudden stop switch in a controller of a motor corresponding to the bearing controller is disconnected, the switch module is controlled to be disconnected.
Specifically, under the condition that the power supply voltage of the bearing controller is provided by the AD-DC power supply and the DC-DC power supply in parallel, when the power supply management module detects that the magnetic suspension bearing is stopped and the scram switch S is disconnected, a disconnection instruction is sent to control the switch K to be disconnected, so that the bearing controller is powered off, and the controller is prevented from being powered on for a long time.
In some embodiments, in step S120, the controlling, by the power management module, the running state of the motor corresponding to the bearing controller (that is, controlling, in the case that the redundant power supply fails, the motor to which the bearing controller belongs to stop) according to the output voltage and the fault signal of the redundant power supply, the bearing suspension state of the bearing controlled by the bearing controller, and the dc bus voltage output by the motor controller to the bearing controller includes: and under the condition that at least one of the AC-DC power supply and the DC-DC power supply fails, controlling the motor corresponding to the bearing controller to stop.
Specifically, when the power management module receives the fault information of the AC-DC power supply or the DC-DC power supply, a motor stopping instruction is immediately sent, so that the motor stops rotating, and the reliability of the system is further improved.
Since the processes and functions implemented by the method of the present embodiment substantially correspond to the embodiments, principles and examples of the magnetic levitation system described above, the description of the present embodiment is not exhaustive, and reference may be made to the related descriptions in the foregoing embodiments, which are not repeated herein.
Through a large number of experiments, the technical scheme of the embodiment is adopted, and a switch is arranged at the front end of the scram switch of the frequency converter so as to control the switch of the AC-DC power supply; and the AC-DC power supply, the DC-DC power supply frequency converter and the bearing controller are managed through the power management module, so that the redundant power supply modes of the AC-DC power supply and the DC-DC power supply are controlled, the problems that the AC-DC power supply cannot be powered off under the condition of normal external power supply, the loss is high, certain potential safety hazards exist and the power supply reliability of the magnetic suspension system is improved are solved.
In summary, it is readily understood by those skilled in the art that the above-described advantageous ways can be freely combined and superimposed without conflict.
The above description is only an example of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims (9)

1. A power supply control device of a bearing controller, comprising: the device comprises a redundant power supply, a switch module and a power management module, wherein the switch module is connected with the redundant power supply; wherein,
the power management module is configured to collect output voltage and fault signals of the redundant power supply, collect working states of the bearings controlled by the bearing controller, and collect direct current bus voltage output by the motor controller to the bearing controller; the method comprises the steps of,
controlling the switch of the switch module and controlling the running state of a motor corresponding to the bearing controller according to the output voltage and fault signals of the redundant power supply, the bearing suspension state of the bearing controlled by the bearing controller and the direct current bus voltage output to the bearing controller by the motor controller;
The redundant power supply includes: an AC-DC power supply and a DC-DC power supply; the AC-DC power supply is arranged between the alternating current power supply and the bearing controller; the DC-DC power supply is arranged between a direct current bus of a controller of the motor corresponding to the bearing controller and the bearing controller; the switch module is arranged between the alternating current power supply and the AC-DC power supply and is positioned at the front end of an scram switch in a controller of a motor corresponding to the bearing controller;
further comprises: a first unidirectional module and a second unidirectional module; wherein,
the first unidirectional module is arranged between the AC-DC power supply and the bearing controller to limit the AC-DC power supply to supply power to the bearing controller in one direction;
the second unidirectional module is arranged between the DC-DC power supply and the bearing controller to limit the DC-DC power supply to supply power to the bearing controller in one direction;
the magnetic suspension bearing controller power supply system is provided by connecting an AD-DC power supply and a DC-DC power supply in parallel, a power supply management module is added, a controllable switch K is added, wherein the controllable switch K is positioned at the front end of a frequency converter scram switch S, and an AC-DC power supply is used for taking power from a mains supply through the opening and closing of the controllable switch K; the emergency stop switch S of the motor is arranged at the rear end of the controllable switch K, and the design ensures that the bearing controller can be powered by an AC-DC power supply even if the power supply device cannot feed back power to the bearing controller through energy when the motor is in high-speed running and suddenly cuts off power or brakes in emergency stop;
The power management module is respectively communicated with the AC-DC power supply, the DC-DC power supply, the bearing controller and the motor, wherein the power management module reads output voltages of the AC-DC power supply and the DC-DC power supply, fault signals and bearing suspension states detected by the bearing controller in real time, controls the controllable switch K on the condition of the output voltages and fault signals and the bearing suspension states, and sends a stall instruction to the motor through communication when the AC-DC power supply or the DC-DC power supply fails to enable the motor to stop rotating.
2. The power supply control device of a bearing controller according to claim 1, wherein the power management module is capable of communicating with the AC-DC power supply, a controller of a motor to which the bearing controller corresponds, the DC-DC power supply, and the bearing controller.
3. The power supply control device of a bearing controller according to any one of claims 1 to 2, wherein the power management module controls switching of the switching module, comprising:
controlling the switch module to be switched on under the condition that the voltage of a direct current bus output by the motor controller to the bearing controller is in a set voltage range, so that the AC-DC power supply and the DC-DC power supply are connected in parallel to supply power to the bearing controller;
Under the condition that an alternating current power supply is powered down, the switch module is controlled to be kept closed, and the energy of a motor corresponding to the bearing controller is fed back and is used for supplying power to the bearing controller through the DC-DC power supply;
under the condition that a motor corresponding to the bearing controller is in emergency stop, the emergency stop switch is disconnected, the energy of the motor corresponding to the bearing controller is fed back and is used for supplying power to the bearing controller through the DC-DC power supply, and the AC-DC power supply is also used for supplying power to the bearing controller so that the bearing controller can continue to work; under the condition that the control bearing of the bearing controller is a magnetic suspension bearing, the bearing controller continues to work until the control bearing of the bearing controller stops floating;
and under the condition that the bearing controlled by the bearing controller is a magnetic suspension bearing, if the magnetic suspension bearing stops floating and a sudden stop switch in a controller of a motor corresponding to the bearing controller is disconnected, the switch module is controlled to be disconnected.
4. The power supply control device of a bearing controller according to any one of claims 1 to 2, wherein the power management module controls an operation state of a motor corresponding to the bearing controller, comprising:
And under the condition that at least one of the AC-DC power supply and the DC-DC power supply fails, controlling the motor corresponding to the bearing controller to stop.
5. A magnetic levitation system, comprising: a power supply control device of a bearing controller as claimed in any one of claims 1 to 4.
6. A method of controlling power to a bearing controller of a magnetic levitation system as defined in claim 5, comprising:
the power management module is configured to collect output voltage and fault signals of a redundant power supply of the bearing controller, collect working states of the bearing controlled by the bearing controller and collect direct current bus voltage output by the motor controller to the bearing controller; the method comprises the steps of,
and controlling the switch of the switch module and controlling the running state of a motor corresponding to the bearing controller according to the output voltage and fault signals of the redundant power supply, the bearing suspension state of the bearing controlled by the bearing controller and the direct current bus voltage output to the bearing controller by the motor controller.
7. The power supply control method of a bearing controller according to claim 6, wherein the redundant power supply includes: an AC-DC power supply and a DC-DC power supply; the AC-DC power supply is arranged between the alternating current power supply and the bearing controller; the DC-DC power supply is arranged between a direct current bus of a controller of the motor corresponding to the bearing controller and the bearing controller; the switch module is arranged between the alternating current power supply and the AC-DC power supply and is positioned at the front end of an scram switch in a controller of the motor corresponding to the bearing controller.
8. The power supply control method of a bearing controller according to claim 6 or 7, wherein controlling the switching of the switching module by a power management module includes:
controlling the switch module to be switched on under the condition that the voltage of a direct current bus output by the motor controller to the bearing controller is in a set voltage range, so that the AC-DC power supply and the DC-DC power supply are connected in parallel to supply power to the bearing controller;
under the condition that an alternating current power supply is powered down, the switch module is controlled to be kept closed, and the energy of a motor corresponding to the bearing controller is fed back and is used for supplying power to the bearing controller through the DC-DC power supply;
under the condition that a motor corresponding to the bearing controller is in emergency stop, the emergency stop switch is disconnected, the energy of the motor corresponding to the bearing controller is fed back and is used for supplying power to the bearing controller through the DC-DC power supply, and the AC-DC power supply is also used for supplying power to the bearing controller so that the bearing controller can continue to work; under the condition that the control bearing of the bearing controller is a magnetic suspension bearing, the bearing controller continues to work until the control bearing of the bearing controller stops floating;
And under the condition that the bearing controlled by the bearing controller is a magnetic suspension bearing, if the magnetic suspension bearing stops floating and a sudden stop switch in a controller of a motor corresponding to the bearing controller is disconnected, the switch module is controlled to be disconnected.
9. The power supply control method of a bearing controller according to claim 6 or 7, wherein controlling, by a power management module, an operation state of a motor corresponding to the bearing controller includes:
and under the condition that at least one of the AC-DC power supply and the DC-DC power supply fails, controlling the motor corresponding to the bearing controller to stop.
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