CN109217774B

CN109217774B - Power-on control method and device for magnetic suspension centrifugal unit, storage medium and motor

Info

Publication number: CN109217774B
Application number: CN201811334289.5A
Authority: CN
Inventors: 张良浩; 李义丽; 靳珂珂; 徐洋
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2018-11-09
Filing date: 2018-11-09
Publication date: 2020-06-30
Anticipated expiration: 2038-11-09
Also published as: CN109217774A

Abstract

The invention discloses a power-on control method, a power-on control device, a storage medium and a motor of a magnetic suspension centrifugal unit, wherein the method comprises the following steps: acquiring a first bus voltage of a bus of the magnetic suspension centrifugal unit in the process of charging a bus capacitor through a set soft start loop; determining whether the first bus voltage rises above a set first voltage; and if the voltage of the first bus rises to be larger than the first voltage, controlling the magnetic suspension centrifugal unit to operate in a set main loop, and further detecting the reference position of a magnetic suspension bearing of the magnetic suspension centrifugal unit under the operation of the main loop. The scheme of the invention can solve the problem of high fault rate of the frequency converter caused by heating of the charging resistor due to the increase of the current flowing through the charging resistor in the soft start loop, and achieves the effect of reducing the fault rate of the frequency converter.

Description

Power-on control method and device for magnetic suspension centrifugal unit, storage medium and motor

Technical Field

The invention belongs to the technical field of motors, and particularly relates to a power-on control method, a power-on control device, a storage medium and a motor of a magnetic suspension centrifugal unit, in particular to a power-on control method of a large-cooling-ton magnetic suspension centrifugal unit, a device corresponding to the method, a motor with the device, a computer-readable storage medium storing instructions corresponding to the method, and a motor capable of executing the instructions corresponding to the method.

Background

In the large-cooling-ton magnetic suspension centrifugal unit, along with the continuous increase of the power of the large-cooling-ton magnetic suspension centrifugal unit, the magnetic suspension bearing becomes larger and larger, the electric energy consumed by the bearing controller for dragging the bearing to detect the reference position is correspondingly increased, and the current flowing through the charging resistor is also increased. This causes the charging resistor to generate heat seriously, and the life of the battery is reduced. Other devices in the frequency converter cabinet can cause the fault of the frequency converter due to the serious hot melting phenomenon caused by heating, so that the whole frequency converter can not run.

Disclosure of Invention

The invention aims to provide a power-on control method, a power-on control device, a storage medium and a motor of a magnetic suspension centrifugal unit, aiming at overcoming the defects that in the prior art, a bearing controller detects a bearing reference position to consume a large amount of electric energy in the starting process of a frequency converter, so that the current of a charging resistor flowing through a soft starting loop is increased to cause the heating of the charging resistor, and the fault rate of the frequency converter is high, and achieving the effect of reducing the fault rate of the frequency converter.

The invention provides a power-on control method of a magnetic suspension centrifugal unit, which comprises the following steps: acquiring a first bus voltage of a bus of the magnetic suspension centrifugal unit in the process of charging a bus capacitor through a set soft start loop; determining whether the first bus voltage rises above a set first voltage; and if the voltage of the first bus rises to be larger than the first voltage, controlling the magnetic suspension centrifugal unit to operate in a set main loop, and further detecting the reference position of a magnetic suspension bearing of the magnetic suspension centrifugal unit under the operation of the main loop.

Optionally, controlling the magnetic suspension centrifugal machine set to operate in a set main loop comprises: controlling a frequency converter main control board and a bearing controller of the magnetic suspension centrifugal unit to be electrified; then, controlling the magnetic suspension centrifugal unit to be switched into a set main loop from the soft start loop to operate; the method for controlling the magnetic suspension centrifugal unit to be switched into a set main loop by the soft start loop to operate comprises the following steps: and controlling a first control switch for controlling the main loop to be powered on, and controlling a second control switch for controlling the soft start loop to be powered off.

Optionally, detecting a reference position of a bearing of the magnetic levitation centrifugal unit under the operation of the main loop comprises: acquiring a second bus voltage of a bus under the operation of the main loop; determining whether the second bus voltage rises to be in a set second voltage range; the lower limit of the second voltage range is greater than the first voltage; and if the second bus voltage rises to be in the second voltage range, sending a set position detection starting instruction to a bearing controller of the magnetic suspension centrifugal unit so as to control the bearing controller to detect the reference position of the magnetic suspension bearing under the condition of receiving the position detection starting instruction.

Optionally, the bearing controller of the magnetic suspension centrifugal unit communicates with a main control board of a frequency converter of the magnetic suspension centrifugal unit through a signal line or an optical fiber; if the bearing controller is communicated with the main control panel of the frequency converter through a signal line, the position detection starting instruction comprises a first set level signal for starting position detection; or if the bearing controller is communicated with the main control board of the frequency converter through optical fibers, the position detection starting instruction comprises a first set optical signal for starting position detection; and/or, detecting the reference position of the magnetic suspension bearing, comprising: dragging the magnetic suspension bearing to more than one set position to detect the reference position of the magnetic suspension bearing.

Optionally, the method further comprises: when the magnetic suspension centrifugal unit is started, the magnetic suspension centrifugal unit is controlled to charge the bus capacitor through the set soft start loop, and then the first bus voltage of the bus in the process that the magnetic suspension centrifugal unit charges the bus capacitor through the set soft start loop is obtained.

Optionally, the method further comprises: acquiring the current bus voltage of a bus in the magnetic suspension centrifugal unit; determining whether the magnetic suspension centrifugal unit currently operates in a set main loop or a set soft start loop according to the current bus voltage; if the magnetic suspension centrifugal unit currently operates in the soft start loop, acquiring a first bus voltage of a bus of the magnetic suspension centrifugal unit in the process of charging a bus capacitor through the set soft start loop; or, if the magnetic suspension centrifugal unit is currently operated in the main loop, detecting the reference position of the magnetic suspension bearing of the magnetic suspension centrifugal unit under the operation of the main loop.

In another aspect, the present invention provides a power-on control device for a magnetic suspension centrifugal machine set, including: the acquisition unit is used for acquiring a first bus voltage of a bus in the process that the magnetic suspension centrifugal unit charges a bus capacitor through a set soft start loop; the control unit is used for determining whether the first bus voltage rises to be larger than a set first voltage or not; the control unit is further configured to control the magnetic suspension centrifugal unit to operate in a set main loop if the first bus voltage rises to be greater than the first voltage, and then detect a reference position of a magnetic suspension bearing of the magnetic suspension centrifugal unit under the operation of the main loop.

Optionally, the control unit controls the magnetic suspension centrifugal unit to operate in a set main loop, including: controlling a frequency converter main control board and a bearing controller of the magnetic suspension centrifugal unit to be electrified; then, controlling the magnetic suspension centrifugal unit to be switched into a set main loop from the soft start loop to operate; the control unit controls the magnetic suspension centrifugal unit to be switched into a set main loop by the soft start loop to operate, and the control method comprises the following steps: and controlling a first control switch for controlling the main loop to be powered on, and controlling a second control switch for controlling the soft start loop to be powered off.

Optionally, the detecting, by the control unit, a reference position of a bearing of the magnetic levitation centrifugal unit under the operation of the main loop includes: acquiring a second bus voltage of a bus under the operation of the main loop; determining whether the second bus voltage rises to be in a set second voltage range; the lower limit of the second voltage range is greater than the first voltage; and if the second bus voltage rises to be in the second voltage range, sending a set position detection starting instruction to a bearing controller of the magnetic suspension centrifugal unit so as to control the bearing controller to detect the reference position of the magnetic suspension bearing under the condition of receiving the position detection starting instruction.

Optionally, the bearing controller of the magnetic suspension centrifugal unit communicates with a main control board of a frequency converter of the magnetic suspension centrifugal unit through a signal line or an optical fiber; if the bearing controller is communicated with the main control panel of the frequency converter through a signal line, the position detection starting instruction comprises a first set level signal for starting position detection; or if the bearing controller is communicated with the main control board of the frequency converter through optical fibers, the position detection starting instruction comprises a first set optical signal for starting position detection; and/or the control unit detects the reference position of the magnetic suspension bearing, and comprises the following steps: dragging the magnetic suspension bearing to more than one set position to detect the reference position of the magnetic suspension bearing.

Optionally, the method further comprises: the control unit is further used for controlling the magnetic suspension centrifugal unit to charge the bus capacitor through a set soft start loop when the magnetic suspension centrifugal unit is started, and then obtaining a first bus voltage of the bus in the process that the magnetic suspension centrifugal unit charges the bus capacitor through the set soft start loop.

Optionally, the method further comprises: the acquisition unit is also used for acquiring the current bus voltage of a bus in the magnetic suspension centrifugal unit; the control unit is also used for determining whether the magnetic suspension centrifugal unit operates in a set main loop or a set soft start loop currently according to the current bus voltage; the control unit is further configured to obtain a first bus voltage of a bus of the magnetic suspension centrifugal unit in a process of charging a bus capacitor through a set soft start loop if the magnetic suspension centrifugal unit currently operates in the soft start loop; or, the control unit is further configured to detect a reference position of a magnetic suspension bearing of the magnetic suspension centrifugal unit under operation of the main loop if the magnetic suspension centrifugal unit is currently operating in the main loop.

In accordance with the above apparatus, another aspect of the present invention provides a frequency converter, including: the power-on control device of the magnetic suspension centrifugal unit is provided.

In accordance with the above method, a further aspect of the present invention provides a storage medium comprising: the storage medium has stored therein a plurality of instructions; the instructions are used for loading and executing the power-on control method of the magnetic suspension centrifugal unit by the processor.

In accordance with the above method, a further aspect of the present invention provides a frequency converter, comprising: a processor for executing a plurality of instructions; a memory to store a plurality of instructions; the instructions are stored in the memory, and loaded and executed by the processor to perform the power-on control method of the magnetic suspension centrifugal unit.

According to the scheme provided by the invention, the heating value of the charging resistor can be reduced by reducing the current flowing through the charging resistor, the problem that the fault rate of the unit is high due to the fact that the current flowing through the charging resistor (namely the charging resistor in the large-cooling-ton magnetic suspension centrifugal unit) is increased along with the continuous increase of the power of the large-cooling-ton magnetic suspension centrifugal unit in the prior art can be solved, the fault rate of the unit is reduced, and the reliability and the safety of the operation of the unit are improved.

Furthermore, according to the scheme of the invention, when the magnetic suspension centrifugal unit is electrified and enters the soft start loop, the bearing reference position is not detected, so that the current flowing through the charging resistor is reduced, and the reliability of the frequency converter is improved; the bearing controller can reduce the consumption of a large amount of electric energy when the bearing controller detects the bearing reference position in the starting process of the frequency converter, avoid the heating of the charging resistor and reduce the fault rate of the unit.

Furthermore, the scheme of the invention can improve the reliability and the safety of the operation of the unit by disconnecting the soft start loop and then starting to detect the bearing reference position after the unit enters the main loop to operate.

Furthermore, according to the scheme of the invention, when the magnetic suspension centrifugal unit is electrified and enters the soft start loop, the bearing reference position is not detected, so that the current flowing through the charging resistor is reduced, and the reliability of the frequency converter is improved; when the unit enters the main loop to operate, the soft start loop is disconnected, and then the bearing reference position starts to be detected; the bearing controller can reduce the consumption of a large amount of electric energy for detecting the bearing reference position in the starting process of the frequency converter, avoid the heating of the charging resistor, reduce the fault rate of the unit and improve the reliability and the safety of the operation of the unit.

Furthermore, according to the scheme of the invention, the control logic of the frequency converter is improved from software by aiming at the power-on control method of the large-cooling-ton magnetic suspension centrifugal unit, and when the magnetic suspension centrifugal unit is powered on and enters a soft start loop, the detection of the bearing reference position is not carried out, so that the consumption of a large amount of electric energy by the bearing controller for detecting the bearing reference position in the starting process of the frequency converter can be reduced, the heating of a charging resistor is avoided, the service lives of the charging resistor and other components are prolonged, and the reliability and the safety of the operation of the unit are improved.

Therefore, according to the scheme of the invention, the bearing reference position is not detected when the magnetic suspension centrifugal unit is electrified and enters the soft start loop, and the bearing reference position is detected under the condition that the soft start loop is disconnected after the magnetic suspension centrifugal unit enters the main loop to operate; the problem of among the prior art in the converter start-up process bearing controller detect bearing reference position consume a large amount of electric energy for charging resistor current increase in the soft start return circuit of flowing through arouses that charging resistor generates heat, leads to the converter fault rate high is solved, thereby, overcome among the prior art charging resistor easily generate heat, the unit fault rate is high and shorten life's defect, realize that charging resistor is difficult for generating heat, the unit fault rate is low and be favorable to increase of service life's beneficial effect.

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 solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

FIG. 1 is a schematic flow chart of an embodiment of a power-on control method of a magnetic suspension centrifugal unit according to the present invention;

FIG. 2 is a schematic flow chart illustrating an embodiment of a method for controlling the magnetic levitation centrifugal unit to operate in a set main loop;

FIG. 3 is a schematic flow chart illustrating an embodiment of the method of the present invention for detecting a reference position of a bearing of the magnetic levitation centrifugal machine set under operation of the main loop;

FIG. 4 is a schematic flow chart illustrating an embodiment of a reference position detection method for selecting a corresponding magnetic bearing according to an operation loop of the magnetic suspension centrifugal unit in the method of the present invention;

FIG. 5 is a schematic structural diagram of an embodiment of a power-on control device of the magnetic levitation centrifugal unit of the present invention;

FIG. 6 is an electrical schematic diagram of an embodiment of a magnetic levitation centrifugal unit in the motor of the present invention;

FIG. 7 is a schematic flow chart of a conventional power-on control method of a magnetic levitation centrifugal machine set, specifically a schematic flow chart of a power-on control method of a magnetic levitation centrifugal machine set before improvement;

fig. 8 is a schematic diagram of a power-on control flow of an embodiment of a magnetic suspension centrifugal unit in a motor according to the present invention, specifically a power-on control method of an improved magnetic suspension centrifugal unit.

The reference numbers in the embodiments of the present invention are as follows, in combination with the accompanying drawings:

102-an obtaining unit; 104-control unit.

K1 — first circuit breaker; k2 — second breaker; r1, R2, R3-charging resistor; c1, C2-bus capacitance.

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 the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the power-on control method of the large-cooling-ton magnetic suspension centrifugal unit, a hardware structure of the magnetic suspension centrifugal unit mainly comprises a main loop, a soft start loop, a frequency converter main control board, a rectification module, an inversion module, a motor, a bearing controller and a bearing, and a schematic diagram of the hardware structure can refer to an example shown in fig. 6. The soft start circuit may be composed of three charging resistors (e.g., charging resistors R1, R2, and R3). Referring to the example shown in fig. 7, when the power is on, the second circuit breaker K2 of the soft start loop is closed, the bus of the frequency converter is charged through the charging resistor, and when the voltage of the bus is greater than 400V, the main control board of the frequency converter and the bearing controller are powered on. The bearing controller is used for controlling the bearing detection reference position to realize stable suspension of the bearing. After the bearing controller is electrified, the bearing is controlled to detect the reference position, and a part of electric energy is consumed, so that the current flowing through the charging resistor is increased, and the heating of the charging resistor is intensified. The second breaker K2 of the soft start circuit is opened manually, the first breaker K1 of the main circuit is closed, and the main circuit is cut. After the motor enters the main loop to operate, the main control board of the frequency converter controls the on-off of the IGBT in the rectification module, converts input 380V three-phase power into 650V direct current, and inverts the direct current into alternating current required by a three-phase motor by controlling the on-off of the IGBT in the inversion module to drive the motor to operate.

According to an embodiment of the present invention, a method for controlling power-on of a magnetic suspension centrifugal machine set is provided, as shown in fig. 1, which is a schematic flow chart of an embodiment of the method of the present invention. The power-on control method of the magnetic suspension centrifugal unit can comprise the following steps: step S110 to step S130.

In step S110, a first bus voltage of the bus during the process of charging the bus capacitor (e.g., the bus capacitor of the magnetic suspension centrifugal unit) by the magnetic suspension centrifugal unit through a set soft start circuit (e.g., the soft start circuit of the magnetic suspension centrifugal unit itself) is obtained.

At step S120, it is determined whether the first bus voltage rises above a set first voltage (e.g., 400V).

In step S130, if the first bus voltage rises to be greater than the first voltage, the magnetic levitation centrifugal machine set is controlled to operate in a set main loop (such as a main loop of the magnetic levitation centrifugal machine set itself), and then a reference position of a magnetic levitation bearing of the magnetic levitation centrifugal machine set is detected under the operation of the main loop (for example, a reference position of a magnetic levitation bearing of the magnetic levitation centrifugal machine set is detected according to a second bus voltage of a bus under the operation of the main loop). In a specific use process, if the voltage of the second bus is not increased to be larger than the first voltage, the magnetic suspension centrifugal unit is controlled to continuously operate in the soft start loop.

For example: when the bus voltage is greater than 400V, the frequency converter main control board and the bearing controller are powered on to detect the bus voltage, when the bus voltage reaches a set value, the main loop operation state of the unit is judged, the frequency converter main control board sends an instruction to the bearing controller to control the bearing controller to start detecting the bearing reference position.

For example: when the unit starts, the frequency converter firstly enters a soft start loop to charge the bus capacitor. When the bus voltage is greater than 400V, the frequency converter main control board and the bearing controller are powered on, and if the command sent by the frequency converter main control board is not received, the bearing controller does not detect the bearing reference position. And only when the frequency converter main control board detects that the bus voltage reaches a set value, the operation state of the unit switched into the main loop is judged, the frequency converter main control board sends an instruction to the bearing controller, and the bearing controller is controlled to start detecting the reference position of the bearing.

For example: when the magnetic suspension centrifugal unit is electrified and enters a soft start loop, the bearing reference position is not detected, so that the current flowing through the charging resistor is reduced, and the reliability of the frequency converter is improved; when the unit enters the main loop to operate, the soft start loop is disconnected, and then the bearing reference position starts to be detected; the problem that in the starting process of the frequency converter, a bearing controller detects that a large amount of electric energy is consumed by a bearing reference position, so that the current of the charging resistor in a soft starting loop is increased to cause resistance heating and the like can be effectively solved.

Therefore, the magnetic suspension centrifugal unit is controlled to operate in the main loop under the condition that the first bus voltage in the process of charging the bus capacitor through the soft start loop is increased to be larger than the set first voltage, and then the reference position of the magnetic suspension bearing is detected under the operation of the main loop, so that the consumption of a large amount of electric energy for detecting the reference position of the bearing by the bearing controller in the starting process of the frequency converter can be reduced, the heating of a charging resistor is avoided, and the fault rate of the frequency converter is reduced.

Optionally, in conjunction with a schematic flowchart of an embodiment of the method shown in fig. 2, which is used to control the magnetic suspension centrifugal unit to operate in the set main loop, a specific process of controlling the magnetic suspension centrifugal unit to operate in the set main loop in step S130 may further include: step S210 and step S220.

And S210, controlling a frequency converter main control board and a bearing controller of the magnetic suspension centrifugal unit to be electrified.

After that time, the user can use the device,

and step S220, controlling the magnetic suspension centrifugal unit to be switched into a set main loop (such as the main loop of the magnetic suspension centrifugal unit) from the soft start loop to operate.

Wherein, controlling the magnetic suspension centrifugal unit to switch into a set main loop (such as the main loop of the magnetic suspension centrifugal unit) from the soft start loop to operate may include: control may be used to control the energizing of a first control switch (e.g., first circuit breaker K1) of the main circuit and to control the de-energizing of a second control switch (e.g., second circuit breaker K2) that may be used to control the soft start circuit.

For example: the second circuit breaker K2 of the soft start loop is closed firstly, the frequency converter is electrified, and 380V three-phase power is accessed. At the moment, the frequency converter enters a soft start loop running state, and the charging resistor starts to work to charge the bus capacitor. When the bus voltage is less than 400V, the charging resistor continuously charges the bus capacitor to increase the bus voltage. And the bus voltage is continuously increased, and when the bus voltage is more than 400V, the main control board of the frequency converter and the bearing controller are powered on. At this time, the main control board of the frequency converter sends out a control signal to manually close the first circuit breaker K1. And manually closing the first breaker K1 of the main loop, and opening the second breaker K2 of the soft start loop, so that the unit enters the running state of the main loop.

Therefore, the magnetic suspension centrifugal unit is controlled to be switched into the main loop from the soft start loop to operate after the main control board of the frequency converter and the bearing controller are controlled to be electrified, and the reliability and the safety of controlling the magnetic suspension centrifugal unit to operate in the main loop under the operation of the soft start loop can be ensured.

Optionally, referring to a schematic flow chart of an embodiment of the method of the present invention shown in fig. 3, in which the reference position of the bearing of the magnetic suspension centrifugal unit is detected under the operation of the main loop, further describing a specific process of detecting the reference position of the bearing of the magnetic suspension centrifugal unit under the operation of the main loop in step S130, the specific process may include: step S310 to step S330.

And step S310, acquiring a second bus voltage of the bus under the operation of the main loop.

And step S320, determining whether the voltage of the second bus is increased to be within a set second voltage range through a frequency converter main control board of the magnetic suspension centrifugal unit. The lower limit of the second voltage range is greater than the first voltage.

Step S330, if the second bus voltage rises to be in the second voltage range, determining that the magnetic suspension centrifugal unit has entered the main loop, and sending a set position detection starting instruction to a bearing controller of the magnetic suspension centrifugal unit through a frequency converter main control board of the magnetic suspension centrifugal unit so as to control the bearing controller to detect the reference position of the magnetic suspension bearing under the condition of receiving the position detection starting instruction.

For example: after switching to the main circuit, the bus voltage rises to about 540V because of no voltage division by the charging resistor. And if the frequency converter main control board detects that the bus voltage does not reach the set threshold (520V-560V), the frequency converter main control board maintains a low voltage signal, and the bearing controller does not detect the bearing reference position. When the main control board detects that the bus voltage is greater than the 520V threshold voltage, the unit is considered to enter the main loop, and a high level signal is sent to the IO port of the bearing controller.

Therefore, under the condition that the voltage of the second bus of the bus rises to the set second voltage range under the operation of the main loop, the set position detection starting instruction is sent to the bearing controller through the main control board of the frequency converter so as to control the bearing controller to detect the reference position of the magnetic suspension bearing under the condition of receiving the position detection starting instruction, the detection reliability is high, the safety is good, and the reliability and the safety of the operation of the frequency converter are improved.

More optionally, the bearing controller of the magnetic suspension centrifugal unit communicates with the frequency converter main control board of the magnetic suspension centrifugal unit through a signal line or an optical fiber.

For example: and the bearing controller is communicated with the main control board of the frequency converter through a signal wire.

For example: the bearing controller can also communicate with the main control board of the frequency converter through optical fibers.

If the bearing controller communicates with the main control board of the frequency converter through a signal line, the position detection start instruction may include a first set level signal (e.g., a high level signal) that may be used to start position detection.

For example: when the bearing controller receives a high level signal of a main control board of the frequency converter, the bearing controller gets power from the bus to start detecting the reference position of the bearing; otherwise, the bearing controller does not perform the detection of the reference position.

Or, if the bearing controller communicates with the main control board of the frequency converter through an optical fiber, the position detection start instruction may include a first setting optical signal that may be used to start position detection. In a specific use process, if the second bus voltage is not increased to be in the second voltage range, a second set level signal (such as a low level signal) which cannot be used for starting position detection or a second set optical signal which cannot be used for starting position detection is maintained through a frequency converter main control board of the magnetic suspension centrifugal unit, so that the bearing controller does not detect the reference position of the magnetic suspension bearing.

For example: the frequency converter main control board can send an optical signal to the bearing controller, and the bearing controller drags the bearing to detect the reference position after detecting the optical signal.

Therefore, the flexibility and the reliability of communication between the bearing controller and the main control board of the frequency converter can be improved in a plurality of communication modes.

More optionally, the detecting the reference position of the magnetic suspension bearing may include: dragging the magnetic suspension bearing to more than one set position to detect the reference position of the magnetic suspension bearing.

For example: and after receiving the high-level signal sent by the main control board of the frequency converter, the bearing controller starts to operate and drags the magnetic suspension bearing to each position detection bearing reference position.

Therefore, the reference position of the magnetic suspension bearing is detected by dragging the magnetic suspension bearing to the set position, and the detection flexibility and the detection accuracy are good.

In an alternative embodiment, the method may further include: when the magnetic suspension centrifugal unit is started, the magnetic suspension centrifugal unit is firstly controlled by a main control board of a frequency converter of the magnetic suspension centrifugal unit to charge a bus capacitor (such as the bus capacitor of the magnetic suspension centrifugal unit) through a set soft start circuit (such as the soft start circuit of the magnetic suspension centrifugal unit), and then the first bus voltage of the magnetic suspension centrifugal unit in the process of charging the bus capacitor (such as the bus capacitor of the magnetic suspension centrifugal unit) through the set soft start circuit (such as the soft start circuit of the magnetic suspension centrifugal unit) to the bus capacitor (such as the bus capacitor of the magnetic suspension centrifugal unit) is obtained in the process of charging the magnetic suspension centrifugal unit through the set soft start circuit (such as the soft start circuit of the magnetic suspension centrifugal unit).

For example: when the unit is started, the frequency converter firstly enters a soft start loop to charge the bus capacitor, and the bearing reference position is not detected at the moment.

Therefore, when the magnetic suspension centrifugal unit is started, the magnetic suspension centrifugal unit firstly runs in the soft start loop, and then the first bus voltage of the bus is obtained in the process of charging the bus capacitor through the soft start loop, so that the bearing reference position is not detected when the magnetic suspension centrifugal unit is electrified and enters the soft start loop, the current flowing through the charging resistor is reduced, and the reliability of the frequency converter is improved.

In an alternative embodiment, the method may further include: and selecting a corresponding reference position detection mode of the magnetic suspension bearing according to the operation loop of the magnetic suspension centrifugal unit.

In the following, referring to a schematic flow chart of an embodiment of selecting a corresponding reference position detection mode of the magnetic suspension bearing according to the operation loop of the magnetic suspension centrifugal unit in the method of the present invention shown in fig. 4, a specific process of selecting a corresponding reference position detection mode of the magnetic suspension bearing according to the operation loop of the magnetic suspension centrifugal unit is further described, which may include: step S410 to step S440.

Step S410, before acquiring a first bus voltage of a bus of the magnetic suspension centrifugal unit in the process of charging a bus capacitor (such as a bus capacitor of the magnetic suspension centrifugal unit) through a set soft start circuit (such as a soft start circuit of the magnetic suspension centrifugal unit), acquiring the current bus voltage of the bus in the magnetic suspension centrifugal unit.

Step S420, determining whether the magnetic suspension centrifugal machine set currently operates in a set main loop (such as the main loop of the magnetic suspension centrifugal machine set) or a set soft start loop (such as the soft start loop of the magnetic suspension centrifugal machine set) according to the current bus voltage.

Step S430, if the magnetic suspension centrifugal unit is currently operating in the soft start loop, controlling the soft start loop to charge a bus capacitor of the magnetic suspension centrifugal unit, and obtaining a first bus voltage of a bus of the magnetic suspension centrifugal unit in a process of charging the bus capacitor through a set soft start loop (e.g., the soft start loop of the magnetic suspension centrifugal unit itself) to the bus capacitor (e.g., the bus capacitor of the magnetic suspension centrifugal unit itself) in a process of controlling the soft start loop to charge the bus capacitor.

Or, in step S440, if the magnetic suspension centrifugal unit is currently operating in the main loop, detecting a reference position of a magnetic suspension bearing of the magnetic suspension centrifugal unit under the operation of the main loop (for example, detecting the reference position of the magnetic suspension bearing of the magnetic suspension centrifugal unit according to a second bus voltage of a bus under the operation of the main loop) to control a bearing controller of the magnetic suspension centrifugal unit to start detecting the reference position of the magnetic suspension bearing of the magnetic suspension centrifugal unit.

For example: and judging whether the frequency converter is in a main loop operation or a soft start loop by detecting the bus voltage, thereby controlling whether the bearing starts to detect the reference position.

Therefore, the reference position detection mode of the corresponding magnetic suspension bearing is selected according to the operation loop of the magnetic suspension centrifugal unit, the detection mode of the reference position of the magnetic suspension bearing is more flexible and reliable, a bearing controller can reduce the consumption of a large amount of electric energy for detecting the reference position of the bearing in the starting process of the frequency converter, the failure rate of the unit is reduced, and the reliability and the safety of the operation of the unit are improved.

Through a large number of tests, the technical scheme of the embodiment is adopted, the heating value of the charging resistor can be reduced by reducing the current flowing through the charging resistor, the problem that the fault rate of the unit is high due to the fact that the current flowing through the charging resistor (namely the charging resistor in the large-cooling-ton magnetic suspension centrifugal unit) is increased along with the continuous increase of the power of the large-cooling-ton magnetic suspension centrifugal unit in the prior art can be solved, the fault rate of the unit is reduced, and the reliability and the safety of the operation of the unit are improved.

According to the embodiment of the invention, the invention further provides a power-on control device of the magnetic suspension centrifugal unit, which corresponds to the power-on control method of the magnetic suspension centrifugal unit. Referring to fig. 5, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The power-on control device of the magnetic suspension centrifugal unit can comprise: an acquisition unit 102 and a control unit 104.

In an alternative example, the obtaining unit 102 may be configured to obtain a first bus voltage of the bus during the process of charging the bus capacitor (e.g., the bus capacitor of the magnetic levitation centrifugal machine set itself) through a set soft start loop (e.g., the soft start loop of the magnetic levitation centrifugal machine set itself). The specific functions and processes of the acquiring unit 102 are referred to in step S110.

In an alternative example, the control unit 104 may be configured to determine whether the first bus voltage rises above a set first voltage (e.g., 400V). The specific function and processing of the control unit 104 are referred to in step S120.

In an optional example, the control unit 104 may be further configured to control the magnetic levitation centrifugal unit to operate in a set main loop (e.g., a main loop of the magnetic levitation centrifugal unit itself) if the first bus voltage rises above the first voltage, and further detect a reference position of a magnetic levitation bearing of the magnetic levitation centrifugal unit under operation of the main loop (e.g., detect the reference position of the magnetic levitation bearing of the magnetic levitation centrifugal unit according to a second bus voltage of a bus under operation of the main loop). The control unit 104 may be further configured to, during a specific use process, control the magnetic suspension centrifugal unit to continue to operate in the soft start loop if the voltage of the second bus is not increased to be greater than the first voltage. The specific function and processing of the control unit 104 are also referred to in step S130.

Alternatively, the control unit 104 controls the magnetic suspension centrifugal machine set to operate in a set main loop (such as the main loop of the magnetic suspension centrifugal machine set itself), which may include:

the control unit 104 may be further configured to control a frequency converter main control board and a bearing controller of the magnetic suspension centrifugal unit to be powered on; the specific functions and processes of the control unit 104 are also referred to in step S210.

After that time, the user can use the device,

the control unit 104 may be further configured to control the magnetic suspension centrifugal unit to switch from the soft start circuit to a set main circuit (e.g., a main circuit of the magnetic suspension centrifugal unit itself) for operation. The specific functions and processes of the control unit 104 are also referred to in step S220.

Wherein, the control unit 104 controls the magnetic suspension centrifugal unit to switch into a set main loop (such as the main loop of the magnetic suspension centrifugal unit itself) from the soft start loop to operate, which may include: the control unit 104 may be further configured to control a first control switch (e.g., a first circuit breaker K1) that may be used to control the main circuit to be powered on, and control a second control switch (e.g., a second circuit breaker K2) that may be used to control the soft start circuit to be powered off.

Optionally, the detecting, by the control unit 104, the reference position of the bearing of the magnetic suspension centrifugal unit in the operation of the main loop may include:

the obtaining unit 102 may be further configured to obtain a second bus voltage of the bus in the main circuit operation. The specific functions and processing of the acquisition unit 102 are also referred to in step S310.

The control unit 104 may be further specifically configured to determine, by using a frequency converter main control board of the magnetic levitation centrifugal unit, whether the second bus voltage rises to be within a set second voltage range. The lower limit of the second voltage range is greater than the first voltage. The specific functions and processes of the control unit 104 are also referred to in step S320.

The control unit 104 may be further specifically configured to determine that the magnetic suspension centrifugal unit has entered the main loop if the second bus voltage rises to be within the second voltage range, and send a set position detection start instruction to a bearing controller of the magnetic suspension centrifugal unit through a frequency converter main control board of the magnetic suspension centrifugal unit, so as to control the bearing controller to detect a reference position of the magnetic suspension bearing when receiving the position detection start instruction. The specific functions and processes of the control unit 104 are also referred to in step S330.

More optionally, the detecting the reference position of the magnetic bearing by the control unit 104 may include: the control unit 104 may be further configured to drag the magnetic suspension bearing to a set one or more positions to detect a reference position of the magnetic suspension bearing.

In an alternative embodiment, the method may further include: the control unit 104 may also be configured to, when the magnetic suspension centrifugal unit is started, control the magnetic suspension centrifugal unit to charge a bus capacitor (e.g., a bus capacitor of the magnetic suspension centrifugal unit) through a set soft start circuit (e.g., a soft start circuit of the magnetic suspension centrifugal unit itself) by using a main control board of a frequency converter of the magnetic suspension centrifugal unit, and then obtain a first bus voltage of the bus of the magnetic suspension centrifugal unit in a process of charging the bus capacitor (e.g., the bus capacitor of the magnetic suspension centrifugal unit) through the set soft start circuit (e.g., the soft start circuit of the magnetic suspension centrifugal unit itself) to the bus capacitor (e.g., the bus capacitor of the magnetic suspension centrifugal unit itself) by using the set soft start circuit (e.g., the soft start circuit of the magnetic suspension centrifugal unit itself).

In an alternative embodiment, the method may further include: the method comprises the following steps of selecting a corresponding reference position detection mode of the magnetic suspension bearing according to an operation loop of the magnetic suspension centrifugal unit:

the obtaining unit 102 may be further configured to obtain a current bus voltage of a bus in the magnetic suspension centrifugal unit before obtaining the first bus voltage of the bus in a process that the magnetic suspension centrifugal unit charges a bus capacitor (e.g., the bus capacitor of the magnetic suspension centrifugal unit) through a set soft start circuit (e.g., the soft start circuit of the magnetic suspension centrifugal unit itself). The specific functions and processes of the acquisition unit 102 are also referred to in step S410.

The control unit 104 may be further configured to determine, according to the current bus voltage, whether the magnetic levitation centrifugal unit is currently operating in a set main loop (e.g., the main loop of the magnetic levitation centrifugal unit) or a set soft start loop (e.g., the soft start loop of the magnetic levitation centrifugal unit). The specific function and processing of the control unit 104 are also referred to in step S420.

The control unit 104 may be further configured to, if the magnetic levitation centrifugal unit is currently operating in the soft start circuit, control the soft start circuit to charge a bus capacitor of the magnetic levitation centrifugal unit, and obtain a first bus voltage of the magnetic levitation centrifugal unit during a process of charging the bus capacitor through a set soft start circuit (e.g., the soft start circuit of the magnetic levitation centrifugal unit itself) to the bus capacitor (e.g., the bus capacitor of the magnetic levitation centrifugal unit itself). The specific functions and processes of the control unit 104 are also referred to in step S430.

Alternatively, the control unit 104 may be further configured to, if the magnetic suspension centrifugal unit is currently operating in the main loop, detect a reference position of a magnetic suspension bearing of the magnetic suspension centrifugal unit under operation of the main loop (for example, detect the reference position of the magnetic suspension bearing of the magnetic suspension centrifugal unit according to a second bus voltage of a bus under operation of the main loop), so as to control a bearing controller of the magnetic suspension centrifugal unit to start detecting the reference position of the magnetic suspension bearing of the magnetic suspension centrifugal unit. The specific functions and processes of the control unit 104 are also referred to in step S440.

Since the processes and functions implemented by the apparatus of this embodiment substantially correspond to the embodiments, principles and examples of the method shown in fig. 1 to 4, the description of this embodiment is not detailed, and reference may be made to the related descriptions in the foregoing embodiments, which are not repeated herein.

Through a large number of tests, the technical scheme of the invention is adopted, and the bearing reference position is not detected when the magnetic suspension centrifugal unit is electrified and enters a soft start loop, so that the current flowing through the charging resistor is reduced, and the reliability of the frequency converter is improved; the bearing controller can reduce the consumption of a large amount of electric energy when the bearing controller detects the bearing reference position in the starting process of the frequency converter, avoid the heating of the charging resistor and reduce the fault rate of the unit.

According to the embodiment of the invention, the motor corresponding to the power-on control device of the magnetic suspension centrifugal unit is also provided. The motor may include: the power-on control device of the magnetic suspension centrifugal unit is provided.

In an alternative embodiment, considering that in a large-cooling-ton magnetic suspension centrifugal unit, since a charging resistor in the unit is a large heat-generating source, if the current flowing through the charging resistor can be reduced, the heat generation of the charging resistor can be reduced. Therefore, the scheme of the invention provides a power-on control method of a large-cooling-ton magnetic suspension centrifugal unit, when the magnetic suspension centrifugal unit is powered on and enters a soft start loop, the detection of the reference position of a bearing is not carried out, so that the current flowing through a charging resistor is reduced, and the reliability of a frequency converter is improved; and after the unit enters the main loop to operate, the soft start loop is disconnected, and then the bearing reference position is detected. Therefore, the problems that in the starting process of the frequency converter, the bearing controller detects that a large amount of electric energy is consumed by the bearing reference position, the current of the charging resistor in the soft start loop is increased, and the caused resistance is heated are solved.

In an optional example, in the scheme of the invention, whether the frequency converter is in the main loop operation or the soft start loop is judged by detecting the bus voltage, so that whether the bearing starts to detect the reference position is controlled. When the unit is started, the frequency converter firstly enters a soft start loop to charge the bus capacitor, and the bearing reference position is not detected at the moment. When the bus voltage is greater than 400V, the frequency converter main control board and the bearing controller are powered on to detect the bus voltage, when the bus voltage reaches a set value, the main loop operation state of the unit is judged, the frequency converter main control board sends an instruction to the bearing controller to control the bearing controller to start detecting the bearing reference position.

For example: judging the running state of the frequency converter according to the bus voltage, and if the frequency converter is in the running state of the soft start loop, not detecting the reference position by the bearing controller; and if the bearing is in the main loop operation state, the bearing controller starts to detect the reference position.

For example: the control mode that whether the frequency converter is in the main loop operation or the soft start loop is judged by detecting the bus voltage, so that whether the bearing starts to detect the reference position or not is controlled, and the inconsistency does not exist between the control mode that the frequency converter firstly enters the soft start loop to charge the bus capacitor when the unit is started. Wherein, the converter starting mode does: firstly, entering a soft start loop to operate, and charging the bus voltage; when the bus voltage is fully charged to about 400V, the main loop is switched into operation.

In the prior art, after the frequency converter is started, the frequency converter firstly enters a soft start loop, and the bearing controller immediately starts to detect a reference position, so that the current of the charging resistor is increased, and the heating is serious. In the invention, after the frequency converter is started, the frequency converter enters a soft start loop first, the bus voltage is detected, if the bus voltage is not more than 520V, the frequency converter is still in the soft start loop running state, and the bearing controller does not detect the reference position when the frequency converter is in the soft start loop running state. And detecting the bus voltage, wherein if the bus voltage is more than 520V, the frequency converter is in a main loop running state, and at the moment, the bearing controller starts to detect the reference position.

In an optional example, in the scheme of the invention, the control logic of the frequency converter is improved from software by a power-on control method of the large-cooling-ton magnetic suspension centrifugal unit. When the unit starts, the frequency converter firstly enters a soft start loop to charge the bus capacitor. When the bus voltage is greater than 400V, the frequency converter main control board and the bearing controller are powered on, and if the command sent by the frequency converter main control board is not received, the bearing controller does not detect the bearing reference position. And only when the frequency converter main control board detects that the bus voltage reaches a set value, the operation state of the unit switched into the main loop is judged, the frequency converter main control board sends an instruction to the bearing controller, and the bearing controller is controlled to start detecting the reference position of the bearing.

In an alternative embodiment, reference may be made to the examples shown in fig. 6 and 8 to illustrate specific implementation procedures of the scheme of the present invention.

As shown in fig. 6, the electrical structural diagram of fig. 6 is a schematic diagram of a power-on starting process of an up-converter of a large-cooling-ton magnetic suspension centrifugal unit. And the bearing controller is communicated with the main control board of the frequency converter through a signal wire. After the bearing controller receives a high-level signal of a main control board of the frequency converter, the bearing controller gets power from a bus to start detecting a bearing reference position; otherwise, the bearing controller does not perform the detection of the reference position.

In an alternative specific example, in the scheme of the present invention, the power-on control method for the large-cooling-ton magnetic suspension centrifugal unit mainly includes:

the second circuit breaker K2 of the soft start loop is closed firstly, the frequency converter is electrified, and 380V three-phase power is accessed. At the moment, the frequency converter enters a soft start loop running state, and the charging resistor starts to work to charge the bus capacitor. When the bus voltage is less than 400V, the charging resistor continuously charges the bus capacitor to increase the bus voltage. And the bus voltage is continuously increased, and when the bus voltage is more than 400V, the main control board of the frequency converter and the bearing controller are powered on. At this time, the main control board of the frequency converter sends out a control signal to manually close the first circuit breaker K1. And manually closing the first breaker K1 of the main loop, and opening the second breaker K2 of the soft start loop, so that the unit enters the running state of the main loop. After switching to the main circuit, the bus voltage rises to about 540V because of no voltage division by the charging resistor. And if the frequency converter main control board detects that the bus voltage does not reach the set threshold (520V-560V), the frequency converter main control board maintains a low voltage signal, and the bearing controller does not detect the bearing reference position. When the main control board detects that the bus voltage is greater than the 520V threshold voltage, the unit is considered to enter the main loop, and a high level signal is sent to the IO port of the bearing controller. And after receiving the high-level signal sent by the main control board of the frequency converter, the bearing controller starts to operate and drags the magnetic suspension bearing to each position detection bearing reference position.

For example: and after the bearing controller receives a high level signal sent by the main control board of the frequency converter, the bearing controller controls the bearing to float and carries out reference position detection.

In an alternative embodiment, the bearing controller may also communicate with the main control board of the frequency converter through an optical fiber, the main control board of the frequency converter may send an optical signal to the bearing controller, and the bearing controller may drag the bearing to detect the reference position after detecting the optical signal.

Since the processes and functions implemented by the motor of this embodiment substantially correspond to the embodiments, principles and examples of the apparatus shown in fig. 5, the descriptions of this embodiment are not detailed, and refer to the related descriptions in the embodiments, which are not described herein.

After a large number of tests prove that by adopting the technical scheme of the invention, the reliability and the safety of the operation of the unit can be improved by disconnecting the soft start loop and then starting to detect the bearing reference position after the unit enters the main loop to operate.

According to an embodiment of the present invention, there is also provided a storage medium corresponding to a power-on control method of a magnetic levitation centrifuge group. The storage medium may include: the storage medium has stored therein a plurality of instructions; the instructions are used for loading and executing the power-on control method of the magnetic suspension centrifugal unit by the processor.

Since the processing and functions implemented by the storage medium of this embodiment substantially correspond to the embodiments, principles, and examples of the methods shown in fig. 1 to fig. 4, details are not described in the description of this embodiment, and reference may be made to the related descriptions in the foregoing embodiments, which are not described herein again.

Through a large number of tests, the technical scheme of the invention is adopted, and the bearing reference position is not detected when the magnetic suspension centrifugal unit is electrified and enters a soft start loop, so that the current flowing through the charging resistor is reduced, and the reliability of the frequency converter is improved; when the unit enters the main loop to operate, the soft start loop is disconnected, and then the bearing reference position starts to be detected; the bearing controller can reduce the consumption of a large amount of electric energy for detecting the bearing reference position in the starting process of the frequency converter, avoid the heating of the charging resistor, reduce the fault rate of the unit and improve the reliability and the safety of the operation of the unit.

According to the embodiment of the invention, the frequency converter corresponding to the power-on control method of the magnetic suspension centrifugal unit is also provided. The frequency converter can comprise: a processor for executing a plurality of instructions; a memory to store a plurality of instructions; the instructions are stored in the memory, and loaded and executed by the processor to perform the power-on control method of the magnetic suspension centrifugal unit.

Since the processing and functions implemented by the frequency converter of this embodiment substantially correspond to the embodiments, principles and examples of the methods shown in fig. 1 to fig. 4, details are not described in the description of this embodiment, and reference may be made to the related descriptions in the foregoing embodiments, which are not described herein again.

Through a large number of tests, the technical scheme of the invention is adopted, the control logic of the frequency converter is improved from software through the power-on control method aiming at the large-cooling-ton magnetic suspension centrifugal unit, and when the magnetic suspension centrifugal unit is powered on and enters a soft start loop, the detection of the bearing reference position is not carried out, so that the consumption of a large amount of electric energy by the bearing controller for detecting the bearing reference position in the starting process of the frequency converter can be reduced, the heating of a charging resistor is avoided, the service lives of the charging resistor and other components are prolonged, and the reliability and the safety of the operation of the unit are improved.

In summary, it is readily understood by those skilled in the art that the advantageous modes described above 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, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A power-on control method of a magnetic suspension centrifugal unit is characterized by comprising the following steps:

acquiring a first bus voltage of a bus of the magnetic suspension centrifugal unit in the process of charging a bus capacitor through a set soft start loop;

determining whether the first bus voltage rises above a set first voltage;

if the voltage of the first bus rises to be larger than the first voltage, controlling the magnetic suspension centrifugal unit to operate in a set main loop, and further detecting the reference position of a magnetic suspension bearing of the magnetic suspension centrifugal unit under the operation of the main loop;

wherein, detecting the reference position of the bearing of the magnetic suspension centrifugal unit under the operation of the main loop comprises the following steps: acquiring a second bus voltage of a bus under the operation of the main loop; determining whether the second bus voltage rises to be in a set second voltage range; the lower limit of the second voltage range is greater than the first voltage; and if the second bus voltage rises to be in the second voltage range, sending a set position detection starting instruction to a bearing controller of the magnetic suspension centrifugal unit so as to control the bearing controller to detect the reference position of the magnetic suspension bearing under the condition of receiving the position detection starting instruction.

2. The method of claim 1, wherein controlling the magnetically levitated centrifugal machine assembly to operate in a set main loop comprises:

controlling a frequency converter main control board and a bearing controller of the magnetic suspension centrifugal unit to be electrified; after that time, the user can use the device,

controlling the magnetic suspension centrifugal unit to be switched into a set main loop from the soft start loop to operate;

the method for controlling the magnetic suspension centrifugal unit to be switched into a set main loop by the soft start loop to operate comprises the following steps:

and controlling a first control switch for controlling the main loop to be powered on, and controlling a second control switch for controlling the soft start loop to be powered off.

3. The method of claim 1, wherein,

the bearing controller of the magnetic suspension centrifugal unit is communicated with a frequency converter main control board of the magnetic suspension centrifugal unit through a signal line or an optical fiber; wherein,

if the bearing controller is communicated with the main control panel of the frequency converter through a signal line, the position detection starting instruction comprises a first set level signal for starting position detection;

or if the bearing controller is communicated with the main control board of the frequency converter through optical fibers, the position detection starting instruction comprises a first set optical signal for starting position detection;

and/or the presence of a gas in the gas,

detecting a reference position of the magnetic bearing, comprising: dragging the magnetic suspension bearing to more than one set position to detect the reference position of the magnetic suspension bearing.

4. The method of any one of claims 1-3, further comprising:

when the magnetic suspension centrifugal unit is started, the magnetic suspension centrifugal unit is controlled to charge the bus capacitor through the set soft start loop, and then the first bus voltage of the bus in the process that the magnetic suspension centrifugal unit charges the bus capacitor through the set soft start loop is obtained.

5. The method of any one of claims 1-3, further comprising:

acquiring the current bus voltage of a bus in the magnetic suspension centrifugal unit;

determining whether the magnetic suspension centrifugal unit currently operates in a set main loop or a set soft start loop according to the current bus voltage;

if the magnetic suspension centrifugal unit currently operates in the soft start loop, acquiring a first bus voltage of a bus of the magnetic suspension centrifugal unit in the process of charging a bus capacitor through the set soft start loop;

or, if the magnetic suspension centrifugal unit is currently operated in the main loop, detecting the reference position of the magnetic suspension bearing of the magnetic suspension centrifugal unit under the operation of the main loop.

6. A power-on control device of a magnetic suspension centrifugal unit is characterized by comprising:

the acquisition unit is used for acquiring a first bus voltage of a bus in the process that the magnetic suspension centrifugal unit charges a bus capacitor through a set soft start loop;

the control unit is used for determining whether the first bus voltage rises to be larger than a set first voltage or not;

the control unit is further configured to control the magnetic suspension centrifugal unit to operate in a set main loop if the first bus voltage rises to be greater than the first voltage, and further detect a reference position of a magnetic suspension bearing of the magnetic suspension centrifugal unit under the operation of the main loop;

wherein, the control unit detects the reference position of the bearing of the magnetic suspension centrifugal unit under the operation of the main loop, and the detection method comprises the following steps: acquiring a second bus voltage of a bus under the operation of the main loop; determining whether the second bus voltage rises to be in a set second voltage range; the lower limit of the second voltage range is greater than the first voltage; and if the second bus voltage rises to be in the second voltage range, sending a set position detection starting instruction to a bearing controller of the magnetic suspension centrifugal unit so as to control the bearing controller to detect the reference position of the magnetic suspension bearing under the condition of receiving the position detection starting instruction.

7. The apparatus of claim 6, wherein the control unit controls the magnetic levitation centrifugal machine set to operate in a set main loop, comprising:

the control unit controls the magnetic suspension centrifugal unit to be switched into a set main loop by the soft start loop to operate, and the control method comprises the following steps:

8. The apparatus of claim 6, wherein,

and/or the presence of a gas in the gas,

the control unit detects the reference position of the magnetic suspension bearing, and comprises: dragging the magnetic suspension bearing to more than one set position to detect the reference position of the magnetic suspension bearing.

9. The apparatus of any of claims 6-8, further comprising:

the control unit is further used for controlling the magnetic suspension centrifugal unit to charge the bus capacitor through a set soft start loop when the magnetic suspension centrifugal unit is started, and then obtaining a first bus voltage of the bus in the process that the magnetic suspension centrifugal unit charges the bus capacitor through the set soft start loop.

10. The apparatus of any of claims 6-8, further comprising:

the acquisition unit is also used for acquiring the current bus voltage of a bus in the magnetic suspension centrifugal unit;

the control unit is also used for determining whether the magnetic suspension centrifugal unit operates in a set main loop or a set soft start loop currently according to the current bus voltage;

the control unit is further configured to obtain a first bus voltage of a bus of the magnetic suspension centrifugal unit in a process of charging a bus capacitor through a set soft start loop if the magnetic suspension centrifugal unit currently operates in the soft start loop;

or, the control unit is further configured to detect a reference position of a magnetic suspension bearing of the magnetic suspension centrifugal unit under operation of the main loop if the magnetic suspension centrifugal unit is currently operating in the main loop.

11. An electric machine, comprising: a power-on control device for a magnetic levitation centrifugal chiller as claimed in any one of claims 6 to 10.

12. A storage medium having a plurality of instructions stored therein; the plurality of instructions for loading and executing by a processor the method for power-up control of a magnetic levitation centrifuge set as recited in any of claims 1-5.

13. An electric machine, comprising:

a processor for executing a plurality of instructions;

a memory to store a plurality of instructions;

wherein the instructions are used for being stored by the memory and loaded by the processor to execute the power-on control method of the magnetic suspension centrifugal machine set according to any one of claims 1-5.