CN116085387A - Auxiliary control system and method for magnetic suspension bearing - Google Patents

Abstract

The invention provides a magnetic suspension bearing auxiliary control system which comprises a rule setting module, a control module, a timing module and a judging module. The rule setting module is operated to set a control rule having a start control parameter value, a steady state control parameter value, a start current parameter value, a steady state current parameter value, a first switching time interval and a second switching time interval. The control module, the timing module and the judging module are used for generating a starting control instruction, a starting current instruction, a lifting control instruction, a lifting current instruction, a steady-state control instruction and a steady-state current instruction according to control rules, so that the parameter value and the current value of a driving command of the applied magnetic bearing control system are stepped up.

Description

Auxiliary control system and method for magnetic suspension bearing

Technical Field

The present disclosure relates to systems and methods, and particularly to a magnetic bearing auxiliary control system and method.

Background

Magnetic bearing assemblies have been widely used in various fields, such as: the control rigidity of the magnetic bearing assembly can be adjusted upwards as much as possible, so that the magnetic bearing assembly is prevented from being out of control under high-frequency rotating speed. Referring to fig. 1 to 4, fig. 1 is a schematic diagram of a prior art magnetic bearing control system; FIG. 2 shows a schematic diagram of a prior art magnetic bearing assembly; FIG. 3 is a schematic diagram of a prior art drive command; and, FIG. 4 shows a schematic diagram of the rotor center position of a prior art magnetic bearing assembly.

As shown, a magnetic bearing control system PA1 includes a position controller PA11, a plurality of power amplifiers PA12a, PA12b, a magnetic bearing assembly PA13, and a position feedback sensor PA14. The magnetic bearing assembly PA13 at least comprises a magnetic rotor PA131, a magnetic stator PA132, a safety bearing PA133 and a sensing module PA134.

The position controller PA11 generates a driving command to drive the magnetic levitation rotor PA131 to levitate and disengage from the safety bearing PA133, wherein the driving command includes a parameter value and a current value. The parameter value is the value of the control parameter (K), the current value is the value of the bias current, and the control parameter and the bias current are commonly called as control rigidity and are common knowledge in the technical field. In practice, the driving command is also used to drive the magnetic bearing assembly PA13 through the power amplifiers PA12a, PA12 b. In order to avoid the runaway of the magnetic bearing assembly at the high frequency rotation speed, the control rigidity of the magnetic bearing assembly is set as high as possible, so that the position controller PA11 in the prior art directly generates the control rigidity of the maximum value M1 that the magnetic bearing assembly PA13 can bear, as shown in fig. 3.

However, the high control rigidity easily makes the magnetic bearing assembly PA13 unstable during the start control, and further makes the magnetic rotor PA131 float up and separate from the safety bearing PA133, and then contact or even strike the safety bearing PA133 due to the overshoot, as shown in fig. 4. Fig. 4 illustrates a rotor center position of the magnetic levitation rotor PA131 sensed by the sensing module PA134. For example, when the rotor center position is 0.4mm, it means that the magnetic levitation rotor PA131 is currently located at a balance center position between the safety bearings PA133, and 0.2mm and 0.6mm are positions where the magnetic levitation rotor PA131 contacts the safety bearings PA133, so when the rotor center position reaches 0.2mm or 0.6mm, it means that the magnetic levitation rotor PA131 contacts or even impacts the safety bearings PA133.

In practice, the position controller PA11 also receives a position command and a position feedback value generated by the position feedback sensor PA14, which are common knowledge in the art, and therefore will not be described in detail.

Disclosure of Invention

In view of the problems of the prior art that the drive command is too high, i.e. the control rigidity is too high, the magnetic levitation bearing assembly is unstable during the start control and the problems that the magnetic levitation rotor is impacted on the safety bearing are caused. A primary object of the present invention is to provide a magnetic suspension bearing auxiliary control system and a method thereof, which are used for solving at least one problem in the prior art.

The invention provides a magnetic bearing auxiliary control system, which is applied to a magnetic bearing control system and comprises a position controller and a magnetic bearing component, wherein the position controller is operated to generate a driving command containing a parameter value and a current value so as to drive the magnetic bearing component, and the magnetic bearing auxiliary control system comprises a rule setting module, a control module, a timing module and a judging module. The rule setting module is operated to set a control rule having a start control parameter value, a steady state control parameter value, a start current parameter value, a steady state current parameter value, a first switching time interval and a second switching time interval. The control module is electrically connected with the rule setting module and is used for generating a starting control instruction and a starting current instruction according to the starting control parameter value and the starting current parameter value, and transmitting the starting control instruction and the starting current instruction to the position controller, so that the parameter value is equal to the starting control parameter value, the current value is equal to the starting current parameter value, and the position controller drives a magnetic levitation rotor of the magnetic levitation bearing assembly to float upwards and separate from a safety bearing of the magnetic levitation bearing assembly according to the parameter value.

The timing module is electrically connected with the control module and is used for starting timing when the control module transmits a starting control instruction and a starting current instruction to the position controller and obtaining a starting time which is elapsed after starting timing. The judging module is electrically connected with the timing module, the control module and the rule setting module and is used for generating a first switching signal when judging that the starting time is longer than the first switching time interval, and generating an ascending control instruction and an ascending current instruction by utilizing the control module according to the control rule so as to adjust the ascending parameter value and the current value; when the starting time is judged to be greater than the second switching time interval, a second switching signal is generated, and a steady-state control command and a steady-state current command are generated by the control module according to the steady-state control parameter value and the steady-state current parameter value, so that the parameter value is equal to the steady-state control parameter value and the current value is equal to the steady-state current parameter value.

On the basis of the above-mentioned necessary technical means, an accessory technical means derived by the present invention is that a rule setting module in the auxiliary control system of the magnetic bearing comprises a manual setting unit, wherein the manual setting unit is operated to set a start control parameter value, a steady state control parameter value, a start current parameter value, a steady state current parameter value, a first switching time interval and a second switching time interval.

On the basis of the above-mentioned necessary technical means, an accessory technical means derived by the present invention is that a control module in a magnetic bearing auxiliary control system comprises a calculating unit, wherein the calculating unit divides a difference between a steady-state control parameter value and a start-up control parameter value by a difference between a second switching time interval and a first switching time interval to generate an up-regulation control command, and divides a difference between a steady-state current parameter value and a start-up current parameter value by a difference between the second switching time interval and the first switching time interval to generate an up-regulation current command.

On the basis of the above-mentioned necessary technical means, an accessory technical means derived by the present invention is that the rule setting module in the magnetic bearing auxiliary control system comprises a receiving unit, a comparing unit and a first setting unit. The magnetic suspension bearing control system also comprises a sensing module, wherein the sensing module is used for sensing the center position of a rotor of the magnetic suspension rotor. The receiving unit is used for receiving the rotor center position. The comparing unit is electrically connected with the receiving unit and used for comparing the central position of the rotor with a balance central position of the safety bearing and generating a balance signal when the central position of the rotor is equal to the balance central position. The first setting unit is electrically connected with the comparing unit and is used for defining the starting time at the moment as a first switching time interval when the balance signal is received.

On the basis of the above-mentioned necessary technical means, an accessory technical means derived by the present invention is a rule setting module in an auxiliary control system of a magnetic bearing, and further comprises a second setting unit, wherein the second setting unit is electrically connected with the first setting unit, and is used for defining a second switching time interval by using the first switching time interval plus twice the current starting time.

The invention aims to solve the problems in the prior art, and adopts the necessary technical means to provide an auxiliary control method for the magnetic bearing, which is implemented by using the auxiliary control system for the magnetic bearing and comprises the following steps: setting a control rule by using a rule setting module; generating a starting control instruction and a starting current instruction by using the control module, so that the parameter value is equal to the starting control parameter value, the current value is equal to the starting current parameter value, and the position controller drives the magnetic levitation rotor to float upwards and separate from the safety bearing; calculating starting time by using a timing module; when the judging module judges that the starting time is longer than the first switching time interval, a first switching signal is generated; generating an ascending control command and an ascending current command by using the control module so as to adjust the ascending parameter value and the current value; when the judging module judges that the starting time is longer than the second switching time interval, a second switching signal is generated; the control module is used for generating a steady-state control command and a steady-state current command so as to enable the parameter value to be equal to the steady-state control parameter value and enable the current value to be equal to the steady-state current parameter value.

Based on the above-mentioned necessary technical means, an accessory technical means derived by the present invention is a step in a method for assisting control of a magnetic bearing, and further comprises the following steps: a manual setting unit of the rule setting module is used for setting a starting control parameter value, a steady-state control parameter value, a starting current parameter value, a steady-state current parameter value, a first switching time interval and a second switching time interval.

Based on the above-mentioned necessary technical means, an accessory technical means derived by the present invention is a step in a method for assisting control of a magnetic bearing, and further comprises the following steps: and generating an up-regulation control command by a calculation unit of the control module according to the difference between the steady-state control parameter value and the start control parameter value divided by the difference between the second switching time interval and the first switching time interval, and generating the up-regulation current command according to the difference between the steady-state current parameter value and the start current parameter value divided by the difference between the second switching time interval and the first switching time interval.

On the basis of the above-mentioned necessary technical means, an accessory technical means derived by the present invention is that the magnetic bearing control system further comprises a sensing module, the sensing module is used for sensing a center position of a rotor of the magnetic bearing rotor, and the magnetic bearing auxiliary control method further comprises the following steps: a receiving unit of the rule setting module is utilized to receive the center position of the rotor; a comparison unit of the rule setting module is utilized to generate a balance signal when the center position of the rotor is equal to the balance center position; when a balance signal is received, a first setting unit of the rule setting module is utilized to define the current starting time as a first switching time interval.

Based on the above-mentioned necessary technical means, an accessory technical means derived by the present invention is a step in a method for assisting control of a magnetic bearing, and further comprises the following steps: and a second setting unit of the rule setting module is utilized to define a second switching time interval by adding twice the current starting time to the first switching time interval.

In the magnetic suspension bearing auxiliary control system provided by the invention, the magnetic suspension rotor is controlled to float upwards by using the rule setting module, the control module, the timing module and the judging module to control the magnetic suspension bearing control system in an auxiliary manner. Compared with the prior art, the invention utilizes the control module to generate the starting control command and the starting current command according to the control rule, generates the lifting control command and the lifting current command at the first switching time interval, and generates the steady-state control command and the steady-state current command at the second switching time interval so as to gradually control the parameter value and the current value, thus the invention can smoothly control the floating of the magnetic levitation rotor, and can prevent the magnetic levitation bearing component from being out of control under the high-frequency rotating speed after gradually lifting the parameter value and the current value, thereby avoiding the problem that the magnetic levitation rotor is in oscillation contact or even touches the safety bearing due to the unstable starting control caused by overlarge parameter value and current value in the prior art. In addition, the rule setting module of the present invention can further automatically define the first switching time interval and the second switching time interval by using the receiving unit, the comparing unit, the first setting unit and the second setting unit.

Drawings

FIG. 1 is a schematic diagram of a prior art magnetic bearing control system;

FIG. 2 shows a schematic diagram of a prior art magnetic bearing assembly;

FIG. 3 is a schematic diagram of a prior art drive command;

FIG. 4 is a schematic diagram showing the rotor center position of a prior art magnetic bearing assembly;

FIG. 5 is a block diagram of an auxiliary control system for a magnetic bearing according to a preferred embodiment of the present invention;

FIG. 6 shows a schematic diagram of a magnetic bearing assembly;

FIG. 7 is a schematic diagram showing a driving command according to a preferred embodiment of the present invention;

FIG. 8 is a schematic diagram of the auxiliary control system for magnetic bearings according to the preferred embodiment of the present invention;

FIG. 9 is a schematic diagram of the present invention for assisting in controlling the position of the center of the rotor of a magnetic bearing assembly; and

FIG. 10 is a flowchart of an auxiliary control method for a magnetic suspension bearing according to a preferred embodiment of the invention.

Reference numerals illustrate:

PA1,2 magnetic bearing control system

PA11,21 position controller

PA12a, PA12b,22a,22b power amplifier

PA13,23 magnetic bearing assembly

PA131,231 magnetic levitation rotor

PA132,232 magnetic levitation stator

PA133,233 safety bearing

PA134,234 sense Module

PA14,24 position feedback sensor

1, auxiliary control system for magnetic suspension bearing

11 rule setting Module

111 Manual setting unit

112 receiving unit

113 comparison unit

114 first setting unit

115 second setting unit

12 control module

121 calculating unit

13 timing module

14 judgment Module

D1 moving direction

L distance

M0 start value

Maximum value M1

T1 first switching time interval

t1 first time point

T2 second switching time interval

t2 second time Point

Delta M, delta T

S101-S111 steps

Detailed Description

Specific embodiments of the present invention will be described in more detail below with reference to the drawings. The advantages and features of the present invention will become more fully apparent from the following description and appended claims. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.

Referring to fig. 5, 6 and 10, fig. 5 is a block diagram showing a supplementary control system for a magnetic bearing according to a preferred embodiment of the invention; FIG. 6 shows a schematic diagram of a magnetic bearing assembly; FIG. 10 is a flowchart of an auxiliary control method for a magnetic suspension bearing according to a preferred embodiment of the invention. As shown in the figure, a magnetic bearing auxiliary control system 1 is applied to a magnetic bearing control system 2, and comprises a rule setting module 11, a control module 12, a timing module 13 and a judging module 14.

The magnetic bearing control system 2 comprises a position controller 21, a plurality of power amplifiers 22a,22b, a magnetic bearing assembly 23 and a position feedback sensor 24. The magnetic bearing assembly 23 at least comprises a magnetic rotor 231, a magnetic stator 232, a safety bearing 233 and a sensing module 234. The architecture of the magnetic suspension bearing control system 2 is the same as that of the magnetic suspension bearing control system PA1 in the prior art, so that redundant description is omitted.

A magnetic bearing auxiliary control method is implemented by using a magnetic bearing auxiliary control system 1 and comprises the following steps S101 to S111.

Step S101: and setting a control rule by using a rule setting module.

The rule setting module 11 is operable to set a control rule having a start control parameter value, a steady state control parameter value, a start current parameter value, a steady state current parameter value, a first switching time interval, and a second switching time interval.

Step S102: the control module is used for generating a starting control instruction and a starting current instruction, and transmitting the starting control instruction and the starting current instruction to the position controller so that the parameter value and the current value are respectively equal to the starting control parameter value and the starting current parameter value, and the position controller drives the magnetic levitation rotor to float upwards.

The control module 12 is electrically connected to the rule setting module 11, and is configured to generate a start control command and a start current command according to the start control parameter value and the start current parameter value, and transmit the start control command and the start current command to the position controller 21, so that the parameter value is equal to the start control parameter value and the current value is equal to the start current parameter value, and the position controller 21 drives a magnetic levitation rotor 231 of the magnetic levitation bearing assembly 23 to float upwards and separate from a safety bearing 233 of the magnetic levitation bearing assembly 23 according to the start control parameter value and the start current parameter value.

Step S103: and timing by using a timing module.

The timing module 13 is electrically connected to the control module 12, and is configured to start timing when the control module 12 transmits the start control command and the start current command to the position controller 21, and obtain a start time elapsed after the start timing.

Step S104: and judging the starting time and the first switching time interval by using a judging module.

Step S105: whether the start-up time is greater than the first switching interval.

If yes in step S105, the flow proceeds to step S106; and if not, repeating step S104.

Step S106: the judging module generates a first switching signal.

The determining module 14 is electrically connected to the timing module 13, the control module 12 and the rule setting module 11, and is configured to generate a first switching signal when the start time is determined to be greater than the first switching time interval.

Step S107: the control module is used for generating an ascending control command and an ascending current command so as to adjust the ascending parameter value and the current value.

Then, the control module 12 generates an up-regulation control command and an up-regulation current command according to the control rule, so as to adjust the parameter value and the current value in the driving command of the position controller 21.

Step S108: and judging the starting time and the second switching time interval by utilizing a judging module.

Step S109: whether the start time is greater than the second switching time interval.

If yes in step S109, the flow proceeds to step S110; and if not, repeating step S108.

Step S110: the judging module generates a second switching signal.

The determining module 14 further determines whether the start time is greater than the second switching time interval, and generates a second switching signal when the start time is greater than the second switching time interval.

Step S111: the control module is used for generating a steady-state control command and a steady-state current command so that the parameter value and the current value are respectively equal to the steady-state control parameter value and the steady-state current parameter value.

The control module 12 generates a steady-state control command and a steady-state current command according to the steady-state control parameter value and the steady-state current parameter value of the control rule, so that the parameter value and the current value are respectively equal to the steady-state control parameter value and the steady-state current parameter value.

Next, please refer to fig. 5-9, wherein fig. 7 is a schematic diagram illustrating a driving command provided by a preferred embodiment of the present invention; FIG. 8 is a schematic diagram of the auxiliary control system for magnetic bearings according to the preferred embodiment of the present invention; FIG. 9 is a schematic diagram of the auxiliary control of the rotor center position of the magnetic bearing assembly according to the present invention. As shown in the figure, in the present embodiment, the rule setting module 11 further includes a manual setting unit 111, and the control module 12 further includes a calculating unit 121.

The manual setting unit 111 is used for a user to manually set the start control parameter value, the steady-state control parameter value, the start current parameter value, the steady-state current parameter value, the first switching time interval T1 and the second switching time interval T2, so as to form a control rule. Generally, the user can set the values according to rules of thumb, big data analysis, product specifications, etc.

The control module 12 generates a start control command and a start current command according to the start control parameter value and the start current parameter value, and transmits the start control command and the start current command to the position controller 21, so that the parameter value is equal to the start control parameter value and the current value is equal to the start current parameter value. Referring to fig. 7, the start value M0 indicates that the start control parameter value and the start current parameter value are equal to each other.

At this time, the position controller 21 drives and controls the magnetic levitation rotor 231 to float up along a moving direction D1 and separate from the safety bearing 233, as shown in fig. 6 and 8. In addition, referring to fig. 9, the center position of the magnetic levitation rotor 231 sensed by the sensing module 234 also gradually rises. Compared to the prior art, referring to fig. 4, the present invention utilizes smaller values of the start control parameter and the start current parameter to generate the start control command and the start current command, so that the rising amplitude of the rotor center position of the magnetic levitation rotor 231 is smoother and smoother, and no oscillation condition as in the prior art is generated. The center position of the rotor is indicated by a distance L between the central axis of the magnetic levitation rotor 231 and the sensing module 234, but not limited thereto. The sensing module 234 can also sense a first gap distance between the boundary of the magnetic levitation rotor 231 and the sensing module 234, and match a radius of the magnetic levitation rotor 231, a second gap distance between the safety bearing 233 and the magnetic levitation rotor 231, etc., so as to sense a parameter that can represent the position of the magnetic levitation rotor 231.

When the judging module 14 judges that the starting time is greater than the first switching time interval T1, a first switching signal is generated. At this time, the control module 12 generates a current-raising control command and a current-raising control command according to the control rule. In this embodiment, the calculating unit 121 may divide the difference between the steady-state control parameter value and the start-up control parameter value by the difference Δt between the second switching time interval T2 and the first switching time interval T1 to generate the step-up control command, and divide the difference between the steady-state current parameter value and the start-up current parameter value by the difference Δt between the second switching time interval T2 and the first switching time interval T1 to generate the step-up current command.

For example, in the present embodiment, when the parameter value and the current value are the start value M0, the start value M0 is the start control parameter value and the start current parameter value; when the parameter value and the current value are the maximum value M1, the maximum value M1 is the steady-state control parameter value and the steady-state current parameter value. Therefore, the calculating unit 121 can be regarded as dividing the difference Δm between the maximum value M1 and the start value M0 by the difference Δt to generate the ramp-up control command and the ramp-up current command, respectively.

Therefore, the step-up control command and the step-up current command will adjust the parameter value and the current value, as shown in fig. 7, between the first time point T1 represented by the first switching time interval T1 and the second time point T2 represented by the second switching time interval T2, the parameter value and the current value are gradually adjusted.

When the judging module 14 judges that the starting time is greater than the second switching time interval T2, a second switching signal is generated. At this time, the control module 12 generates a steady-state control command and a steady-state current command according to the steady-state control parameter value and the steady-state current parameter value, so that the parameter value is equal to the steady-state control parameter value and the current value is equal to the steady-state current parameter value, i.e. the maximum value M1 in the present embodiment. It should be noted that, the maximum value M1 in the present embodiment is the maximum value M1 in the prior art.

Compared with the prior art, which directly adopts the maximum value M1 as the driving command for increasing the rigidity, the present invention gradually increases the parameter value and the current value of the driving command from the start value M0 (the start control parameter value and the start current parameter value) to the maximum value M1 (the steady state control parameter value and the steady state current parameter value) according to the first switching time interval T1 and the second switching time interval T2. Next, fig. 4 and fig. 9 can be compared together, and the rising amplitude of the rotor center position is gentle and stable through the gradual control of the parameter value and the current value, so that the problem of the prior art oscillation is avoided, and the problem that the magnetic levitation rotor 231 contacts and impacts the safety bearing 233 is naturally avoided.

Besides, in addition to the manual setting unit 111, in the present embodiment, the rule setting module 11 may also include a receiving unit 112, a comparing unit 113 and a first setting unit 114.

The receiving unit 112 is configured to receive the rotor center position sensed by the sensing module 234. The comparing unit 113 is electrically connected to the receiving unit 112, and is configured to compare the rotor center position with a balance center position of the safety bearing 233, and generate a balance signal when the rotor center position is equal to the balance center position. The first setting unit 114 is electrically connected to the comparing unit 113, and is configured to define a current start time as a first switching time interval when the balance signal is received.

For example, when the comparing unit 113 determines that the rotor center position is 0.4mm, the balancing signal is generated, and the first setting unit 114 defines the start time at this time as the first switching time interval T1. Therefore, after defining the first switching interval T1, the start time is longer than the first switching interval T1, and the control module 12 generates the step-up control command and the step-up current command.

In addition, the rule setting module 11 further includes a second setting unit 115, and the second setting unit 115 is electrically connected to the first setting unit 114, so as to define a second switching time interval T2 by using the first switching time interval T1 plus twice the current start time. The second switching time interval T2 may also be regarded as three times the first switching time interval T1. When the start time is longer than the second switching time interval T2, the control module 12 generates a steady-state control command and a steady-state current command.

The purpose of using the first switching time interval T1 plus twice the current start time is that the first switching time interval T1 is the time taken for the magnetic levitation rotor 231 to move half the movable distance (the distance between the safety bearings 233) from the safety bearings 233, so that the time interval (which can be considered as the interval where the difference Δt is located) between the value of the lifting parameter and the value of the current is recommended to be greater than the first switching time interval T1, even twice the first switching time interval T1, so as to avoid unstable oscillation of the whole system.

In summary, the magnetic suspension bearing auxiliary control system provided by the invention utilizes the rule setting module, the control module, the timing module and the judging module to control the magnetic suspension bearing control system to control the magnetic suspension rotor to float upwards. Compared with the prior art, the invention utilizes the control module to generate the starting control command and the starting current command according to the control rule, generates the lifting control command and the lifting current command at the first switching time interval, and generates the steady-state control command and the steady-state current command at the second switching time interval so as to gradually control the parameter value and the current value, thus the invention can smoothly control the floating of the magnetic levitation rotor, and can prevent the magnetic levitation bearing component from being out of control under the high-frequency rotating speed after gradually lifting the parameter value and the current value, thereby avoiding the problem that the magnetic levitation rotor is in oscillation contact or even touches the safety bearing due to the unstable starting control caused by overlarge parameter value and current value in the prior art. In addition, the rule setting module of the present invention can further automatically define the first switching time interval and the second switching time interval by using the receiving unit, the comparing unit, the first setting unit and the second setting unit.

In view of the foregoing detailed description of the preferred embodiments, it is intended that the features and spirit of the invention be more clearly described rather than limiting the scope of the invention as defined by the foregoing description of the preferred embodiments. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the scope of the invention as defined by the appended claims.

Claims (10)

1. A magnetic bearing auxiliary control system for a magnetic bearing control system, the magnetic bearing control system comprising a position controller and a magnetic bearing assembly, the position controller being operable to generate drive commands comprising parameter values and current values to drive the magnetic bearing assembly, the magnetic bearing auxiliary control system comprising:

the rule setting module is used for setting a control rule in an operation mode, wherein the control rule is provided with a starting control parameter value, a steady-state control parameter value, a starting current parameter value, a steady-state current parameter value, a first switching time interval and a second switching time interval;

the control module is electrically connected with the rule setting module and is used for generating a starting control instruction and a starting current instruction according to the starting control parameter value and the starting current parameter value, and transmitting the starting control instruction and the starting current instruction to the position controller so as to enable the parameter value to be equal to the starting control parameter value and the current value to be equal to the starting current parameter value, and enabling the position controller to drive a magnetic levitation rotor of the magnetic levitation bearing assembly to float upwards and separate from a safety bearing of the magnetic levitation bearing assembly according to the starting control instruction and the starting current instruction;

the timing module is electrically connected with the control module and is used for starting timing when the control module transmits the starting control instruction and the starting current instruction to the position controller and obtaining starting time which is elapsed after starting timing; and

the judging module is electrically connected with the timing module, the control module and the rule setting module and is used for generating a first switching signal when judging that the starting time is longer than the first switching time interval, and generating an ascending control instruction and an ascending current instruction by utilizing the control module according to the control rule so as to ascend the parameter value and the current value; and when the starting time is judged to be greater than the second switching time interval, generating a second switching signal, and generating a steady-state control instruction and a steady-state current instruction by utilizing the control module according to the steady-state control parameter value and the steady-state current parameter value, so that the parameter value is equal to the steady-state control parameter value and the current value is equal to the steady-state current parameter value.

2. The magnetic levitation bearing auxiliary control system of claim 1, wherein the rule setting module comprises a manual setting unit operable to set the start control parameter value, the steady state control parameter value, the start current parameter value, the steady state current parameter value, the first switching time interval, and the second switching time interval.

3. The magnetic levitation bearing auxiliary control system of claim 2, wherein the control module comprises a calculation unit that divides a difference between the steady-state control parameter value and the start control parameter value by a difference between the second switching time interval and the first switching time interval to generate the step-up control command, and divides a difference between the steady-state current parameter value and the start current parameter value by a difference between the second switching time interval and the first switching time interval to generate the step-up current command.

4. The magnetic levitation bearing auxiliary control system of claim 1, wherein the magnetic levitation bearing control system further comprises a sensing module to sense a rotor center position of the magnetic levitation rotor, the rule setting module comprising:

a receiving unit for receiving the rotor center position;

the comparing unit is electrically connected with the receiving unit and used for comparing the central position of the rotor with the balance central position of the safety bearing and generating a balance signal when the central position of the rotor is equal to the balance central position; and

the first setting unit is electrically connected with the comparing unit and is used for defining the starting time at the moment as the first switching time interval when the balance signal is received.

5. The auxiliary control system of claim 4, wherein the rule setting module further comprises a second setting unit electrically connected to the first setting unit for defining the second switching time interval by using the first switching time interval plus twice the current start time.

6. A magnetic bearing auxiliary control method implemented by the magnetic bearing auxiliary control system as claimed in claim 1, comprising the steps of:

(a) Setting the control rule by using the rule setting module;

(b) Generating the starting control command and the starting current command by using the control module, so that the parameter value is equal to the starting control parameter value, the current value is equal to the starting current parameter value, and the position controller drives the magnetic levitation rotor to float upwards and separate from the safety bearing according to the starting control command and the starting current command;

(c) Timing by using the timing module;

(d) When the judging module judges that the starting time is longer than the first switching time interval, the first switching signal is generated;

(e) Generating the rise-regulating control command and the rise-regulating current command by utilizing the control module so as to rise the parameter value and the current value;

(f) When the judging module judges that the starting time is longer than the second switching time interval, generating a second switching signal;

(g) And generating the steady-state control command and the steady-state current command by using the control module, so that the parameter value is equal to the steady-state control parameter value and the current value is equal to the steady-state current parameter value.

7. The supplementary control method for a magnetic bearing according to claim 6, wherein the step (a) further comprises the steps of:

(a1) And setting the starting control parameter value, the steady-state control parameter value, the starting current parameter value, the steady-state current parameter value, the first switching time interval and the second switching time interval by using a manual setting unit of the rule setting module.

8. The supplementary control method for a magnetic bearing according to claim 7, wherein the step (e) further comprises the steps of:

(e1) And generating the step-up control command by using a calculation unit of the control module according to the difference between the steady-state control parameter value and the starting control parameter value divided by the difference between the second switching time interval and the first switching time interval, and generating the step-up current command according to the difference between the steady-state current parameter value and the starting current parameter value divided by the difference between the second switching time interval and the first switching time interval.

9. The magnetic levitation bearing auxiliary control method of claim 6, wherein the magnetic levitation bearing control system further comprises a sensing module for sensing a rotor center position of the magnetic levitation rotor, the step (a) further comprising the steps of:

(a1) Receiving the rotor center position by using a receiving unit of the rule setting module;

(a2) Generating a balance signal when comparing that the rotor center position is equal to the balance center position of the safety bearing by using the comparison unit of the rule setting module;

(a3) And when the first setting unit of the rule setting module receives the balance signal, defining the starting time at that time as the first switching time interval.

10. The supplementary control method for a magnetic bearing according to claim 9, wherein the step (a) further comprises the steps of:

(a4) And a second setting unit of the rule setting module is utilized to define the second switching time interval by adding twice of the starting time of the first switching time interval.

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