WO2017125072A1 - 一种用于磁悬浮离心机的停机方法及装置 - Google Patents

一种用于磁悬浮离心机的停机方法及装置 Download PDF

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Publication number
WO2017125072A1
WO2017125072A1 PCT/CN2017/071924 CN2017071924W WO2017125072A1 WO 2017125072 A1 WO2017125072 A1 WO 2017125072A1 CN 2017071924 W CN2017071924 W CN 2017071924W WO 2017125072 A1 WO2017125072 A1 WO 2017125072A1
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Prior art keywords
centrifuge
magnetic levitation
motor
shutdown
phase
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PCT/CN2017/071924
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English (en)
French (fr)
Inventor
李燕
牛高产
陈广辉
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珠海格力节能环保制冷技术研究中心有限公司
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Priority to DK17741103.0T priority Critical patent/DK3406344T3/da
Priority to US16/070,647 priority patent/US10850287B2/en
Priority to EP17741103.0A priority patent/EP3406344B1/en
Publication of WO2017125072A1 publication Critical patent/WO2017125072A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B9/00—Drives specially designed for centrifuges; Arrangement or disposition of transmission gearing; Suspending or balancing rotary bowls
    • B04B9/10—Control of the drive; Speed regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B9/00—Drives specially designed for centrifuges; Arrangement or disposition of transmission gearing; Suspending or balancing rotary bowls
    • B04B9/12—Suspending rotary bowls ; Bearings; Packings for bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/04—Periodical feeding or discharging; Control arrangements therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B13/00—Control arrangements specially designed for centrifuges; Programme control of centrifuges
    • 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
    • F16C2231/00—Running-in; Initial operation
    • 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
    • F16C2300/00—Application independent of particular apparatuses
    • F16C2300/02—General use or purpose, i.e. no use, purpose, special adaptation or modification indicated or a wide variety of uses mentioned
    • 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
    • F16C32/047—Details of housings; Mounting of active magnetic bearings

Definitions

  • the present invention relates to the field of automation control technology, and in particular to a parking method and apparatus for a magnetic suspension centrifuge.
  • Magnetic suspension centrifuge is one of the more common types of centrifuges. As the main component of magnetic suspension centrifuge, the performance of the motor is also receiving more and more attention.
  • the commonly used shutdown method is: first determine whether the input power system is normal when the centrifuge is stopped. If the three-phase input power is normal, the motor of the centrifuge can be operated in the deceleration state to stop the machine; if the three-phase electric input is abnormal, the main circuit of the frequency conversion cabinet and the charging circuit need to be disconnected, and the motor of the centrifuge is operated at the same time. A mode of generating energy feedback to power the magnetic levitation controller until the motor stalls.
  • the embodiment of the invention provides a shutdown method for a magnetic levitation centrifuge to solve the problem that the motor of the magnetic levitation centrifuge cannot be quickly switched from the running state to the stop state when the bearing or the bearing controller is abnormal.
  • the method comprises: a frequency conversion cabinet connected to a magnetic levitation centrifuge to determine a shutdown state of the magnetic levitation centrifuge; and when the determined shutdown state satisfies a preset condition, the change
  • the frequency cabinet switches an operation mode of the motor of the magnetic levitation centrifuge from an electric state mode to a power generation state mode to convert inertial mechanical energy when the motor is stopped into electric energy; the inverter converts the motor to the said Electrical energy is incorporated into the electrical grid to consume the converted electrical energy.
  • variable frequency cabinet connected to the magnetic levitation centrifuge determines that the shutdown state of the magnetic levitation centrifuge comprises: receiving, by the frequency conversion cabinet connected to the magnetic levitation centrifuge, a shutdown prompt sent by the magnetic levitation centrifuge, and The shutdown prompt extracts operating parameters of the bearing and bearing controller of the magnetic levitation centrifuge and operating parameters of the power supply system of the magnetic levitation centrifuge.
  • the stopping the state to meet the preset condition specifically includes: when the magnetic levitation centrifuge is stopped, the bearing or the bearing controller of the magnetic levitation centrifuge is faulty.
  • the inverter cabinet integrates the electrical energy converted by the motor into the power grid to consume the converted electrical energy, and specifically includes: the motor obtained by using the conversion in a power generation state mode Power is supplied to the DC bus of the inverter cabinet to generate a pumping voltage on the DC bus; the inverter cabinet converts the generated pumping voltage into a current having a first phase, and the first The phase current is input into the grid, and the second phase of the voltage in the grid is 180° out of phase with the first phase.
  • converting the pumping voltage generated by the inverter cabinet to the current having the first phase specifically includes: converting the pumping voltage generated by the inverter controller to the reactor by using a four-quadrant controller Is the current with the first phase.
  • the embodiment of the invention also provides a stopping device for a magnetic levitation centrifuge to solve the problem that the motor of the magnetic levitation centrifuge cannot be quickly switched from the running state to the stop state when the bearing or the bearing controller is abnormal.
  • the device includes: a shutdown state determining unit, configured to determine a shutdown state of the magnetic levitation centrifuge; and a working mode switching unit, configured to: when the determined shutdown state meets a preset condition, the motor of the magnetic levitation centrifuge The working mode is switched from the electric state mode to the power generation state mode to convert the inertial mechanical energy when the motor is stopped into electric energy; the electric energy consumption unit is configured to integrate the electric energy converted by the electric motor into the electric grid to consume Converting the resulting electrical energy.
  • the shutdown state determining unit specifically includes: a shutdown prompt receiving module, configured to receive a shutdown prompt sent by the magnetic levitation centrifuge; and an operating parameter extraction module, configured to extract the The operating parameters of the bearing and bearing controller of the magnetic levitation centrifuge and the operating parameters of the power supply system of the magnetic levitation centrifuge.
  • the stopping state meets a preset condition, specifically: the magnetic levitation centrifugation When the machine is shut down, the bearing or bearing controller of the magnetic levitation centrifuge malfunctions.
  • the power consumption unit specifically includes: a DC bus power supply module, configured to use the converted power to supply power to a DC bus of the frequency conversion cabinet, so that a pump voltage is generated on the DC bus; And converting the generated pumping voltage into a current having a first phase, and inputting the current having the first phase into the power grid, wherein the voltage in the power grid has a second phase and the first phase The difference is 180°.
  • the grid-connecting module specifically includes: a conversion module, configured to convert the generated pumping voltage generated by the four-quadrant controller into a current having a first phase by a reactor.
  • a shutdown method and apparatus for a magnetic levitation centrifuge can determine whether a bearing or a bearing controller of a magnetic levitation centrifuge is malfunctioning by analyzing a shutdown state of the magnetic levitation centrifuge.
  • the operating mode of the motor of the magnetic levitation centrifuge can be switched, so that the mechanical energy of the motor rotation can be converted into electrical energy.
  • the converted electrical energy can be integrated into the grid so that the generated electrical energy can be quickly consumed by the electrical grid. In this way, the motor can stop rotating in a short period of time, thereby avoiding a large damage to the bearing.
  • FIG. 1 is a flow chart of a shutdown method for a magnetic levitation centrifuge provided by an embodiment of the present application
  • FIG. 2 is a functional block diagram of a shutdown device for a magnetic suspension centrifuge according to an embodiment of the present application.
  • FIG. 1 is a flow chart of a shutdown method for a magnetic levitation centrifuge provided by an embodiment of the present application. Although the process described below includes multiple operations that occur in a particular order, it should be clear that these processes More or fewer operations may be included, which may be performed sequentially or in parallel (eg, using a parallel processor or a multi-threaded environment). As shown in FIG. 1, the method may include:
  • S1 The frequency conversion cabinet connected to the magnetic levitation centrifuge determines the shutdown state of the magnetic levitation centrifuge.
  • the magnetic levitation centrifuge may be connected to a frequency conversion cabinet, and the frequency conversion cabinet may include a rectifier and an inverter.
  • the rectifier and the inverter may be connected by a DC bus, and after the rectifier converts the input alternating current into direct current, the DC bus may supply the converted direct current to the inverter.
  • the inverter can thereby reconvert the converted direct current into alternating current having a certain frequency.
  • the alternating current having a certain frequency can be input into the magnetic levitation centrifuge, and by changing the frequency of the alternating current, the operating mode of the motor in the magnetic levitation centrifuge can be controlled.
  • the current conversion and the frequency control in the frequency conversion cabinet can be realized by the frequency conversion cabinet controller, and the frequency conversion cabinet controller can establish a remote connection with the frequency conversion cabinet, so that the Remote operation of the frequency converter cabinet.
  • the bearing of the motor in the magnetic suspension centrifuge is an important component. When the bearing of the motor fails, it is often necessary to stop the operation of the motor immediately, otherwise the bearing will continue to operate in the event of failure and cause great damage to the bearing. In addition, in practical applications, the bearings are often remotely controlled by the bearing controller, so when the bearing controller fails, the motor needs to be stopped immediately.
  • the frequency conversion cabinet can monitor the working state of the magnetic levitation centrifuge in real time. Specifically, the magnetic levitation centrifuge can encapsulate its working parameters into a message and send it to the frequency conversion cabinet according to a preset period. When the magnetic levitation centrifuge is stopped, a shutdown prompt can be sent to the frequency conversion cabinet. In this way, when the inverter cabinet receives the shutdown prompt from the magnetic levitation centrifuge, the operating parameters of the bearing and the bearing controller of the magnetic levitation centrifuge and the power supply system of the magnetic levitation centrifuge can be extracted from the shutdown prompt. Working parameters. By analyzing the operating parameters of the bearing and bearing controller and the operating parameters of the power supply system, it can be judged whether the bearing, the bearing controller and the power supply system are in normal operation when the magnetic levitation centrifuge is stopped.
  • the frequency conversion cabinet switches the working mode of the motor of the magnetic levitation centrifuge from the electric state mode to the power generation state mode to inertial mechanical energy when the motor is stopped. Convert to electrical energy.
  • the shutdown state when the magnetic levitation centrifuge is stopped, the shutdown state often has the following situations:
  • the motor of the magnetic levitation centrifuge can be operated in the power generation energy feedback mode, so that the motor can generate electric energy while rotating, and the magnetic levitation centrifuge can be continuously operated for a period of time until The motor stops rotating.
  • the embodiments of the present application can take reasonable shutdown measures for the failure of the bearing or the bearing controller.
  • the inverter cabinet finds an abnormality in the bearing or the bearing controller from the extracted working parameters of the bearing and the bearing controller of the magnetic levitation centrifuge, it can be determined that the current shutdown state of the magnetic levitation centrifuge satisfies a preset condition, thereby Protection against downtime of the magnetic levitation centrifuge can be initiated.
  • the frequency conversion cabinet can switch the operating mode of the motor of the magnetic levitation centrifuge from the electric state mode to the power generation state mode to convert the inertial mechanical energy when the motor is stopped into electrical energy. Since the bearing or the bearing controller of the magnetic levitation centrifuge malfunctions at this time, it is necessary to switch the motor from the rotating state to the stopped state in the shortest time. After converting the mechanical energy of the motor rotation into electrical energy, it is necessary to find a way to quickly consume the converted electrical energy.
  • S3 The frequency conversion cabinet integrates the electric energy converted by the motor into the power grid to consume the converted electric energy.
  • the frequency conversion cabinet may integrate the electric energy converted by the motor into the power grid to consume the converted electric energy. Since the grid has a large demand for electric energy, after the converted electric energy is integrated into the grid, the electric energy can be quickly consumed. At this time, the rotating motor is actually supplying power to the power grid. When the speed of the power consumption of the power grid is greater than or equal to the power converted by the motor, the motor can quickly stop rotating in a short time.
  • the motor in the power generation state mode may use the converted electric energy to supply power to the DC bus of the frequency conversion cabinet, so that the DC voltage is generated on the DC bus.
  • the motor and the direct bus can directly establish a feedback loop. Through the feedback loop, the motor can load the converted electric energy on the DC bus. Since the power on the DC bus cannot be fed back to the input through the rectifier bridge, The capacitor itself absorbs the electrical energy provided by the motor, causing the voltage across the DC bus to rise and form a pumping voltage.
  • the inverter cabinet can convert the pumping voltage into a current, and the current is Consumption in the grid.
  • the frequency converter cabinet supplies the converted current to the grid, certain conditions must be met in order for the supplied current to be absorbed by the grid. If certain conditions are not met, the power supply to the inverter cabinet may occur, and such a situation is not conducive to quickly switching the rotation state of the motor.
  • the inverter cabinet can convert the generated pumping voltage generated by the four-quadrant controller into a current having a first phase through the reactor. The first phase and the second phase of the voltage in the power grid need to meet the condition of 180° difference.
  • the power provided by the frequency conversion cabinet can be expressed by:
  • P is the power provided by the frequency conversion cabinet
  • U is the voltage provided by the frequency conversion cabinet
  • I is the current supplied by the frequency conversion cabinet. Is the phase difference between U and I. Where U is in phase with the voltage in the grid, and I is opposite to the voltage in the grid (phase difference is 180°), then the settlement of the above equation is negative. From the end of the grid, the power provided by the inverter cabinet is negative, indicating that the grid is currently absorbing the power supplied by the inverter cabinet. In this way, the electrical energy converted by the mechanical energy of the motor rotation can be quickly consumed by the power grid to achieve the effect of quickly switching the rotational state of the motor to the stopped state.
  • a shutdown method for a magnetic levitation centrifuge can determine whether the bearing of the magnetic levitation centrifuge or the bearing controller is faulty by analyzing the shutdown state of the magnetic levitation centrifuge.
  • the operating mode of the motor of the magnetic levitation centrifuge can be switched, so that the mechanical energy of the motor rotation can be converted into electrical energy.
  • the converted electrical energy can be integrated into the grid so that the generated electrical energy can be quickly consumed by the electrical grid. In this way, the motor can stop rotating in a short period of time, thereby avoiding a large damage to the bearing.
  • the invention also provides a shutdown device for a magnetic suspension centrifuge.
  • 2 is a functional block diagram of a shutdown device for a magnetic suspension centrifuge according to an embodiment of the present application. As shown in FIG. 2, the device includes:
  • the shutdown state determining unit 100 is configured to determine a shutdown state of the magnetic levitation centrifuge
  • the working mode switching unit 200 is configured to switch the working mode of the motor of the magnetic levitation centrifuge from the electric state mode to the power generating state mode when the determined stop state meets the preset condition, to stop the motor Inertial mechanical energy is converted into electrical energy;
  • the power consumption unit 300 is configured to integrate the electrical energy converted by the motor into the power grid to consume the converted electrical energy.
  • the shutdown state determining unit 100 specifically includes:
  • a shutdown prompt receiving module configured to receive a shutdown prompt sent by the magnetic levitation centrifuge
  • a working parameter extraction module configured to extract, from the shutdown prompt, an operating parameter of the bearing and the bearing controller of the magnetic levitation centrifuge and an operating parameter of the power supply system of the magnetic levitation centrifuge.
  • the stopping state meets the preset condition specifically includes:
  • the power consumption unit 300 specifically includes:
  • a DC bus power supply module configured to supply power to the DC bus of the frequency conversion cabinet by using the converted electric energy, so that a pumping voltage is generated on the DC bus;
  • a grid-connecting module configured to convert the generated pumping voltage into a current having a first phase, and input the current having the first phase into the power grid, wherein the voltage in the power grid has a second phase and the The first phase differs by 180°.
  • the grid-connected module specifically includes:
  • a conversion module configured to convert the generated pumping voltage generated by the four-quadrant controller into a current having a first phase through the reactor.
  • a stop device for a magnetic levitation centrifuge can determine whether the bearing of the magnetic levitation centrifuge or the bearing controller is faulty by analyzing the shutdown state of the magnetic levitation centrifuge.
  • the operating mode of the motor of the magnetic levitation centrifuge can be switched, so that the mechanical energy of the motor rotation can be converted into electrical energy.
  • the converted electrical energy can be integrated into the grid so that the generated electrical energy can be quickly consumed by the electrical grid. In this way, the motor can stop rotating in a short period of time, thereby avoiding a large damage to the bearing.

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Abstract

一种用于磁悬浮离心机的停机方法及装置，其中所述方法包括：与磁悬浮离心机相连的变频柜判断所述磁悬浮离心机的停机状态；当判断的所述停机状态满足预设条件时，所述变频柜将所述磁悬浮离心机的电机的工作模式由电动状态模式切换为发电状态模式，以将所述电机停机时的惯性机械能转换为电能；所述变频柜将所述电机转换得到的所述电能并入电网中，以消耗转换得到的所述电能。该用于磁悬浮离心机的停机方法及装置，能够解决当前在轴承或者轴承控制器发生异常状况时，无法快速地将磁悬浮离心机的电机从运行状态切换至停止状态的问题。

Description

一种用于磁悬浮离心机的停机方法及装置
本申请要求于2016年01月20日提交中国专利局、申请号为201610037499.2、发明名称为“一种用于磁悬浮离心机的停机方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及自动化控制技术领域，具体而言，涉及一种用于磁悬浮离心机的停车方法及装置。
背景技术
磁悬浮离心机是较为常见的离心机种类之一，电机作为磁悬浮离心机的主要组件，其使用性能也日益受到人们的广泛关注。
在磁悬浮离心机的停机中，常采用的停机方法为：首先判断离心机停机时输入电源系统是否正常。若三相输入电正常，则可以使得离心机的电机工作于减速状态，从而进行停机；若三相电输入异常，则需要断开变频柜主回路及充电回路，同时使得离心机的电机工作于发电能量回馈的模式，以向磁悬浮控制器供电直至电机停转。
然而采用上述停机方式时，只是考虑到供电系统异常状况时的可靠停机。若磁悬浮离心机的轴承或轴承控制器本身发生异常状况时，在上述的停机方式下，离心机的电机会因惯性继续运转。无论是使得电机工作于减速状态还是使得电机工作于发电能量回馈的状态，电机从运行到停止的时间都太长。在轴承或轴承控制器发生异常状况时，如果不能快速地将电机从运行状态切换至停止状态，则会由于电机长时间的转动而对轴承造成较大的损伤。
针对上述问题，目前尚未提出有效的解决方式。
发明内容
本发明实施例提供了一种用于磁悬浮离心机的停机方法，以解决当前在轴承或者轴承控制器发生异常状况时，无法快速地将磁悬浮离心机的电机从运行状态切换至停止状态的问题，该方法包括与磁悬浮离心机相连的变频柜判断所述磁悬浮离心机的停机状态；当判断的所述停机状态满足预设条件时，所述变 频柜将所述磁悬浮离心机的电机的工作模式由电动状态模式切换为发电状态模式，以将所述电机停机时的惯性机械能转换为电能；所述变频柜将所述电机转换得到的所述电能并入电网中，以消耗转换得到的所述电能。
在一个实施例中，所述与磁悬浮离心机相连的变频柜判断所述磁悬浮离心机的停机状态具体包括：与磁悬浮离心机相连的变频柜接收所述磁悬浮离心机发来的停机提示，并从所述停机提示中提取所述磁悬浮离心机的轴承和轴承控制器的工作参数以及所述磁悬浮离心机的供电系统的工作参数。
在一个实施例中，所述停机状态满足预设条件具体包括：所述磁悬浮离心机在停机时，所述磁悬浮离心机的轴承或者轴承控制器出现故障。
在一个实施例中，所述变频柜将所述电机转换得到的所述电能并入电网中，以消耗转换得到的所述电能具体包括：处于发电状态模式的所述电机利用转换得到的所述电能向所述变频柜的直流母线供电，使得所述直流母线上产生泵升电压；所述变频柜将产生的所述泵升电压转换为具备第一相位的电流，并将所述具备第一相位的电流输入电网中，所述电网中电压具备的第二相位与所述第一相位相差180°。
在一个实施例中，所述变频柜将产生的所述泵升电压转换为具备第一相位的电流具体包括：所述变频柜利用四象限控制器将产生的所述泵升电压通过电抗器转换为具备第一相位的电流。
本发明实施例还提供了一种用于磁悬浮离心机的停机装置，以解决当前在轴承或者轴承控制器发生异常状况时，无法快速地将磁悬浮离心机的电机从运行状态切换至停止状态的问题，该装置包括：停机状态判断单元，用于判断所述磁悬浮离心机的停机状态；工作模式切换单元，用于当判断的所述停机状态满足预设条件时，将所述磁悬浮离心机的电机的工作模式由电动状态模式切换为发电状态模式，以将所述电机停机时的惯性机械能转换为电能；电能消耗单元，用于将所述电机转换得到的所述电能并入电网中，以消耗转换得到的所述电能。
在一个实施例中，所述停机状态判断单元具体包括：停机提示接收模块，用于接收所述磁悬浮离心机发来的停机提示；工作参数提取模块，用于从所述停机提示中提取所述磁悬浮离心机的轴承和轴承控制器的工作参数以及所述磁悬浮离心机的供电系统的工作参数。
在一个实施例中，所述停机状态满足预设条件具体包括：所述磁悬浮离心 机在停机时，所述磁悬浮离心机的轴承或者轴承控制器出现故障。
在一个实施例中，所述电能消耗单元具体包括：直流母线供电模块，用于利用转换得到的所述电能向变频柜的直流母线供电，使得所述直流母线上产生泵升电压；并网模块，用于将产生的所述泵升电压转换为具备第一相位的电流，并将所述具备第一相位的电流输入电网中，所述电网中电压具备的第二相位与所述第一相位相差180°。
在一个实施例中，所述并网模块具体包括：转换模块，用于利用四象限控制器将产生的所述泵升电压通过电抗器转换为具备第一相位的电流。
根据本发明的一种用于磁悬浮离心机的停机方法及装置，可以通过分析磁悬浮离心机的停机状态，从而判断出磁悬浮离心机的轴承或者轴承控制器是否出现故障。当出现故障时，便可以将磁悬浮离心机的电机的工作模式进行切换，从而可以将电机转动的机械能转换为电能。进而可以将转换后的电能并入电网中，从而可以由电网快速地消耗产生的电能。这样，电机便可以在较短的时间内停止转动，从而避免了对轴承造成较大的损伤。
附图说明
构成本申请的一部分的附图用来提供对本发明的进一步理解，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：
图1为本申请实施例提供的一种用于磁悬浮离心机的停机方法流程图；
图2为本申请实施例提供的一种用于磁悬浮离心机的停机装置功能模块图。
具体实施方式
为了使本技术领域的人员更好地理解本申请中的技术方案，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都应当属于本申请保护的范围。
图1本申请实施例提供的一种用于磁悬浮离心机的停机方法流程图。虽然下文描述流程包括以特定顺序出现的多个操作，但是应该清楚了解，这些过程 可以包括更多或更少的操作，这些操作可以顺序执行或并行执行(例如使用并行处理器或多线程环境)。如图1所示，所述方法可以包括：
S1：与磁悬浮离心机相连的变频柜判断所述磁悬浮离心机的停机状态。
在本申请实施例中，所述磁悬浮离心机可以与变频柜相连，所述变频柜中可以包括整流器和逆变器。所述整流器与逆变器之间可以通过直流母线相连，所述整流器将输入的交流电转换为直流电后，所述直流母线可以将转换得到的直流电供给所述逆变器。所述逆变器从而可以将转换得到的直流电重新转换为具备一定频率的交流电。所述具备一定频率的交流电可以输入所述磁悬浮离心机中，通过改变该交流电的频率，从而可以控制所述磁悬浮离心机中电机的工作模式。在实际应用场景中，所述变频柜中电流的转换以及频率的控制均可以通过变频柜控制器来实现，所述变频柜控制器可以与所述变频柜建立远程连接，从而可以实现对所述变频柜的远程操作。
所述磁悬浮离心机中电机的轴承为重要组件，在电机的轴承发生故障时，往往需要立即停止电机的运转，否则让轴承在发生故障的情况下持续运转会对轴承造成较大的损伤。此外，在实际应用场景中，所述轴承往往通过轴承控制器进行远程控制，因此当轴承控制器出现故障时，也需要立即停止电机的运转。
在本申请实施例中，所述变频柜可以实时监测磁悬浮离心机的工作状态。具体地，所述磁悬浮离心机可以按照预设的周期，将自身的工作参数封装成报文发送给变频柜。当所述磁悬浮离心机停机时，可以将停机提示发送给所述变频柜。这样，当变频柜接收到所述磁悬浮离心机发来的停机提示时，可以从所述停机提示中提取所述磁悬浮离心机的轴承和轴承控制器的工作参数以及所述磁悬浮离心机的供电系统的工作参数。通过对轴承和轴承控制器的工作参数以及供电系统的工作参数进行分析，从而可以判断出在磁悬浮离心机停机时，轴承、轴承控制器以及供电系统是否处于正常运转状态。
S2：当判断的所述停机状态满足预设条件时，所述变频柜将所述磁悬浮离心机的电机的工作模式由电动状态模式切换为发电状态模式，以将所述电机停机时的惯性机械能转换为电能。
在本申请实施例中，所述磁悬浮离心机停机时，其停机状态往往存在以下几种情况：
1)轴承和轴承控制器正常，没有出现故障，同时供电系统也正常。
在这种情况下，磁悬浮离心机在停机后，其电机可以工作于减速状态，并 逐渐停止运转。
2)轴承和轴承控制器正常，没有出现故障，但供电系统出现故障。
在这种情况下，由于供电系统无法对磁悬浮离心机进行供电，那么在磁悬浮离心机停机后，需要断开变频柜的主回路以及充电回路，防止供电系统对磁悬浮离心机带来影响。同时，为了避免磁悬浮离心机在停机时立刻断电，可以将磁悬浮离心机的电机工作于发电能量回馈模式中，从而可以使得电机在转动的同时产生电能，供磁悬浮离心机持续运行一段时间，直至电机停止转动为止。
上述的两个情况在现有技术中均有对应的停机措施，本申请实施例可以针对轴承或者轴承控制器出现故障的情况来采取合理的停机措施。具体地，当变频柜从提取的所述磁悬浮离心机的轴承和轴承控制器的工作参数中发现轴承或者轴承控制器出现异常时，则可以确定磁悬浮离心机当前的停机状态满足预设条件，从而可以启动对磁悬浮离心机进行停机的保护措施。
在实际应用场景中，所述变频柜可以将所述磁悬浮离心机的电机的工作模式由电动状态模式切换为发电状态模式，以将所述电机停机时的惯性机械能转换为电能。由于此时磁悬浮离心机的轴承或者轴承控制器发生故障，因此需要将电机在最短的时间内由转动状态切换至停止状态。将电机转动的机械能转换为电能后，则需要寻找将转换的电能快速消耗的方式。
S3：所述变频柜将所述电机转换得到的所述电能并入电网中，以消耗转换得到的所述电能。
在本申请实施例中，所述变频柜可以将所述电机转换得到的所述电能并入电网中，以消耗转换得到的所述电能。由于电网对于电能的需求较大，因此将转换得到的电能并入电网后，可以快速地将电能消耗掉。此时，转动的电机实际上就是在向电网供电，当电网消耗电量的速度大于或者等于电机转换的电能时，电机便可以在短时间内迅速停止转动。
具体地，在本申请实施例中，处于发电状态模式的所述电机可以利用转换得到的所述电能向所述变频柜的直流母线供电，使得所述直流母线上产生泵升电压。所述电机与所述直接母线直接可以建立反馈回路，通过所述反馈回路，电机可以将转换的电能加载于直流母线上，由于直流母线上的电能无法通过整流桥回馈至输入端，只能靠本身的电容来吸收电机提供的电能，从而使得直流母线两端的电压升高，形成泵升电压。
在形成泵升电压后，变频柜可以将该泵升电压转换为电流，并将该电流并 入电网中进行消耗。在变频柜向电网提供转换后的电流时，需要满足一定的条件才能使得提供的电流能够被电网吸收。如果不满足一定的条件，可能会出现电网向变频柜供电的情况，而这样的情况则不利于快速切换电机的转动状态。具体地，变频柜可以利用四象限控制器将产生的所述泵升电压通过电抗器转换为具备第一相位的电流。所述第一相位与电网中电压具备的第二相位需要满足相差180°的条件，这样，从电网这一端看来，变频柜提供的功率可以通过下式表示：
Figure PCTCN2017071924-appb-000001
其中，P为变频柜提供的功率，U为变频柜提供的电压，I为变频柜提供的电流，
Figure PCTCN2017071924-appb-000002
为U和I之间的相位差。其中U与电网中的电压是同相位的，而I与电网中的电压是反向的(相位差为180°)，那么上式计算的结算就是负数。从电网这一端看变频柜提供的功率是负值，则说明电网目前在吸收变频柜提供的电能。这样，电机转动的机械能转换得到的电能便可以被电网快速地消耗，以达到快速地将电机的转动状态切换为停止状态的效果。
由上可见，根据本发明的一种用于磁悬浮离心机的停机方法，可以通过分析磁悬浮离心机的停机状态，从而判断出磁悬浮离心机的轴承或者轴承控制器是否出现故障。当出现故障时，便可以将磁悬浮离心机的电机的工作模式进行切换，从而可以将电机转动的机械能转换为电能。进而可以将转换后的电能并入电网中，从而可以由电网快速地消耗产生的电能。这样，电机便可以在较短的时间内停止转动，从而避免了对轴承造成较大的损伤。
本发明还提供一种用于磁悬浮离心机的停机装置。图2为本申请实施例提供的一种用于磁悬浮离心机的停机装置功能模块图。如图2所示，所述装置包括：
停机状态判断单元100，用于判断所述磁悬浮离心机的停机状态；
工作模式切换单元200，用于当判断的所述停机状态满足预设条件时，将所述磁悬浮离心机的电机的工作模式由电动状态模式切换为发电状态模式，以将所述电机停机时的惯性机械能转换为电能；
电能消耗单元300，用于将所述电机转换得到的所述电能并入电网中，以消耗转换得到的所述电能。
在本申请一优选实施例中，所述停机状态判断单元100具体包括：
停机提示接收模块，用于接收所述磁悬浮离心机发来的停机提示；
工作参数提取模块，用于从所述停机提示中提取所述磁悬浮离心机的轴承和轴承控制器的工作参数以及所述磁悬浮离心机的供电系统的工作参数。
其中，所述停机状态满足预设条件具体包括：
所述磁悬浮离心机在停机时，所述磁悬浮离心机的轴承或者轴承控制器出现故障。
在本申请一优选实施例中，所述电能消耗单元300具体包括：
直流母线供电模块，用于利用转换得到的所述电能向变频柜的直流母线供电，使得所述直流母线上产生泵升电压；
并网模块，用于将产生的所述泵升电压转换为具备第一相位的电流，并将所述具备第一相位的电流输入电网中，所述电网中电压具备的第二相位与所述第一相位相差180°。
其中，所述并网模块具体包括：
转换模块，用于利用四象限控制器将产生的所述泵升电压通过电抗器转换为具备第一相位的电流。
需要说明的是，上述各个功能模块的具体实现过程与步骤S1至S3一致，这里便不再赘述。
由上可见，根据本发明的一种用于磁悬浮离心机的停机装置，可以通过分析磁悬浮离心机的停机状态，从而判断出磁悬浮离心机的轴承或者轴承控制器是否出现故障。当出现故障时，便可以将磁悬浮离心机的电机的工作模式进行切换，从而可以将电机转动的机械能转换为电能。进而可以将转换后的电能并入电网中，从而可以由电网快速地消耗产生的电能。这样，电机便可以在较短的时间内停止转动，从而避免了对轴承造成较大的损伤。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明实施例可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (10)

  1. 一种用于磁悬浮离心机的停机方法，其特征在于，包括：
    与磁悬浮离心机相连的变频柜判断所述磁悬浮离心机的停机状态；
    当判断的所述停机状态满足预设条件时，所述变频柜将所述磁悬浮离心机的电机的工作模式由电动状态模式切换为发电状态模式，以将所述电机停机时的惯性机械能转换为电能；
    所述变频柜将所述电机转换得到的所述电能并入电网中，以消耗转换得到的所述电能。
  2. 根据权利要求1所述的方法，其特征在于，所述与磁悬浮离心机相连的变频柜判断所述磁悬浮离心机的停机状态具体包括：
    与磁悬浮离心机相连的变频柜接收所述磁悬浮离心机发来的停机提示，并从所述停机提示中提取所述磁悬浮离心机的轴承和轴承控制器的工作参数以及所述磁悬浮离心机的供电系统的工作参数。
  3. 根据权利要求1所述的方法，其特征在于，所述停机状态满足预设条件具体包括：
    所述磁悬浮离心机在停机时，所述磁悬浮离心机的轴承或者轴承控制器出现故障。
  4. 根据权利要求1所述的方法，其特征在于，所述变频柜将所述电机转换得到的所述电能并入电网中，以消耗转换得到的所述电能具体包括：
    处于发电状态模式的所述电机利用转换得到的所述电能向所述变频柜的直流母线供电，使得所述直流母线上产生泵升电压；
    所述变频柜将产生的所述泵升电压转换为具备第一相位的电流，并将所述具备第一相位的电流输入电网中，所述电网中电压具备的第二相位与所述第一相位相差180°。
  5. 根据权利要求4所述的方法，其特征在于，所述变频柜将产生的所述泵升电压转换为具备第一相位的电流具体包括：
    所述变频柜利用四象限控制器将产生的所述泵升电压通过电抗器转换为具备第一相位的电流。
  6. 一种用于磁悬浮离心机的停机装置，其特征在于，包括：
    停机状态判断单元，用于判断所述磁悬浮离心机的停机状态；
    工作模式切换单元，用于当判断的所述停机状态满足预设条件时，将所述磁悬浮离心机的电机的工作模式由电动状态模式切换为发电状态模式，以将所述电机停机时的惯性机械能转换为电能；
    电能消耗单元，用于将所述电机转换得到的所述电能并入电网中，以消耗转换得到的所述电能。
  7. 根据权利要求6所述的装置，其特征在于，所述停机状态判断单元具体包括：
    停机提示接收模块，用于接收所述磁悬浮离心机发来的停机提示；
    工作参数提取模块，用于从所述停机提示中提取所述磁悬浮离心机的轴承和轴承控制器的工作参数以及所述磁悬浮离心机的供电系统的工作参数。
  8. 根据权利要求6所述的装置，其特征在于，所述停机状态满足预设条件具体包括：
    所述磁悬浮离心机在停机时，所述磁悬浮离心机的轴承或者轴承控制器出现故障。
  9. 根据权利要求6所述的装置，其特征在于，所述电能消耗单元具体包括：
    直流母线供电模块，用于利用转换得到的所述电能向变频柜的直流母线供电，使得所述直流母线上产生泵升电压；
    并网模块，用于将产生的所述泵升电压转换为具备第一相位的电流，并将所述具备第一相位的电流输入电网中，所述电网中电压具备的第二相位与所述第一相位相差180°。
  10. 根据权利要求9所述的装置，其特征在于，所述并网模块具体包括：
    转换模块，用于利用四象限控制器将产生的所述泵升电压通过电抗器转换为具备第一相位的电流。
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