CN109687395A - A kind of magnetic suspension motor power-off protection apparatus and method based on electric energy feedback - Google Patents
A kind of magnetic suspension motor power-off protection apparatus and method based on electric energy feedback Download PDFInfo
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- CN109687395A CN109687395A CN201811424629.3A CN201811424629A CN109687395A CN 109687395 A CN109687395 A CN 109687395A CN 201811424629 A CN201811424629 A CN 201811424629A CN 109687395 A CN109687395 A CN 109687395A
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- magnetic suspension
- direct current
- motor
- electric energy
- current bus
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption
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- Magnetic Bearings And Hydrostatic Bearings (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The present invention relates to a kind of magnetic suspension motor power-off protection apparatus based on electric energy feedback; including motor inverter and the automatically controlled system of magnetic suspension bearing; the motor inverter includes rectifier and inverter; frequency changer direct current bus is connected between the rectifier and inverter; the automatically controlled system of magnetic suspension bearing includes magnetic suspension power amplifier and magnetic suspension controller; the magnetic suspension power amplifier includes magnetic suspension DC bus, it is characterised in that: the frequency changer direct current bus is in parallel with the magnetic suspension DC bus.The invention further relates to a kind of magnetic suspension motor power-off protection method based on electric energy feedback.Effect of the invention is can to extract rotor kinetic energy when magnetic suspension motor encounters power blackout situation and be converted to electric energy maintenance magnetic suspension bearing and its control system normal work, so that rotor caused by avoiding because of magnetic suspension bearing power loss falls the accident of leading.
Description
Technical field
The present invention relates to magnetic suspension motor systems technology field more particularly to a kind of magnetic suspension motors based on electric energy feedback
Power-off protection apparatus and method.
Background technique
Magnetic suspension motor, which refers to, is suspended rotor using magnetic suspension bearing, thus without the novel of contactless rotation that rub
Motor.Due to absolutely not being contacted between rotor and stator, it has the advantage that (1) is without abrasion, long service life；(2) turn
Sub- peripheral velocity is high；(3) it does not need to lubricate and seal；(4) calorific value very little, it is low in energy consumption；(5) environmental suitability is strong, can be
It works in vacuum and corrosive medium.In view of these advantages, magnetic suspension motor, especially magnetic suspension high speed motor are in high speed air blast
Machine/compressor, accumulated energy flywheel, vacuum molecular pump and high fast-burn booster distributed power generation field, which have, to be more and more widely used.
However magnetic suspension bearing (Active Magnetic Suspending Bearing) works by electric energy, once equipment encounters power-off at work
Situation, magnetic suspension bearing will be out of hand, and high-speed rotating rotor is caused to fall, the loss of damaging property.This is asked
Topic, a scheme configure auxiliary mechanical bearing to magnetic suspension system, carry out when control system powers off or fails to rotor interim
Property support, but rotor high speed has huge kinetic energy when falling, and shock and vibration are very likely to cause auxiliary bearing damage.
Another solution is to be equipped with a UPS(uninterruptible power system to magnetic suspension system), magnetic suspension can be made after a loss of power
Bearing works on a period of time until rotor speed falls to zero, but UPS price itself is higher, increases electric-control system
Cost.It is therefore desirable to develop a kind of economical and effective technological means to cope with possible power blackout situation to magnetic suspension motor
Potential threat.
Summary of the invention
The present invention overcomes the deficiencies in the prior art, provide a kind of magnetic suspension motor power-off protection dress based on electric energy feedback
It sets and method, the kinetic energy of rotor can be converted into electric energy rapidly when power is off, on the one hand make its dimension to magnetic suspension bearing power supply
Work is held, on the other hand can apply braking moment to rotor makes it quickly stop.
In order to achieve the above objectives, the technical solution adopted by the present invention are as follows: a kind of magnetic suspension motor based on electric energy feedback is disconnected
Electrical protective device, including motor inverter and the automatically controlled system of magnetic suspension bearing, the motor inverter include rectifier and inversion
Device is connected with frequency changer direct current bus between the rectifier and inverter, the automatically controlled system of magnetic suspension bearing includes magnetcisuspension
Floating power amplifier and magnetic suspension controller, the magnetic suspension power amplifier include magnetic suspension DC bus, the frequency converter
DC bus and the magnetic suspension DC bus are directly in parallel or the frequency changer direct current bus is become by DC/DC converter
It is in parallel after changing voltage with the magnetic suspension DC bus.
A kind of magnetic suspension motor power-off protection method based on electric energy feedback, uses described device, comprising the following steps:
(1) a threshold value is set for the voltage of the frequency changer direct current bus, monitors the voltage of the frequency changer direct current bus, if
When the voltage value is lower than this threshold value, then magnetic suspension motor power down is judged, execute step (2)；
(2) rotor for adjusting the motor inverter to magnetic suspension motor applies braking moment, while rotor kinetic energy being converted to
At electric energy feedback to the frequency changer direct current bus of the motor inverter.
In a preferred embodiment of the present invention, a kind of magnetic suspension motor power-off protection method based on electric energy feedback is further
It include so that magnetic suspension motor is worked in four-quadrant by adjusting the output frequency of the motor inverter including the step (2)
Limit.
In a preferred embodiment of the present invention, a kind of magnetic suspension motor power-off protection method based on electric energy feedback is further
Including maintaining the voltage of the frequency changer direct current bus constant by adjusting the output frequency of the motor inverter.
In a preferred embodiment of the present invention, a kind of magnetic suspension motor power-off protection method based on electric energy feedback is further
Include the steps that maintaining the voltage of the frequency changer direct current bus constant are as follows: constant as mesh using the voltage of frequency changer direct current bus
The output frequency of mark control motor inverter, the voltage if frequency changer direct current bus are accelerated lower than output frequency is reduced if setting value
Braking increases output frequency if the voltage of frequency changer direct current bus is higher than setting value and slows down braking.
In a preferred embodiment of the present invention, a kind of magnetic suspension motor power-off protection method based on electric energy feedback is further
Output frequency including controlling the motor inverter using PI controller.
The invention has the following advantages:
(1) when magnetic suspension motor encounters power blackout situation, can extract rotor kinetic energy be converted to electric energy maintain magnetic suspension bearing and
Its control system works normally, so that rotor caused by avoiding because of magnetic suspension bearing power loss falls the accident of leading.
(2) when encountering power blackout situation, the kinetic energy of rotor can be consumed rapidly, motor is made quickly to stop.
(3) configuration UPS is not needed, cost is saved.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the structural schematic diagram of the preferred embodiment of the present invention；
Fig. 2 is the schematic diagram of the output frequency of the control motor inverter of the preferred embodiment of the present invention；
In figure: 10, motor inverter, 12, the automatically controlled system of magnetic suspension bearing, 14, rectifier, 16, inverter, 18, frequency converter it is straight
Stream bus, 20, magnetic suspension power amplifier, 22, magnetic suspension controller, 24, magnetic suspension DC bus, 26, DC/DC converter,
28, DC capacitor, 30, magnetic suspension motor.
Specific embodiment
Presently in connection with drawings and examples, the present invention is described in further detail, these attached drawings are simplified signal
Figure, the basic structure of the invention will be illustrated schematically only, therefore it only shows the composition relevant to the invention.
As shown in Figure 1, a kind of magnetic suspension motor power-off protection apparatus based on electric energy feedback, including 10 He of motor inverter
The automatically controlled system 12 of magnetic suspension bearing, motor inverter 10 include rectifier 14 and inverter 16, rectifier 14 and inverter 16 it
Between be connected with frequency changer direct current bus 18, the automatically controlled system 12 of magnetic suspension bearing includes magnetic suspension power amplifier 20 and magnetic suspension control
Device 22 processed, magnetic suspension power amplifier 20 includes magnetic suspension DC bus 24, if the voltage and magnetcisuspension of frequency changer direct current bus 18
The identical then direct parallel connection of voltage class of floating DC bus 24；If the voltage of frequency changer direct current bus 18 and magnetic suspension DC bus
24 voltage class is not identical, and frequency changer direct current bus 18 passes through female with magnetic suspension direct current after 26 voltage of transformation of DC/DC converter
Line 24 is in parallel.Since magnetic suspension DC bus 24 and frequency changer direct current bus 18 are in parallel, the electric energy of feedback is led to
It crosses frequency changer direct current bus 18 and is supplied to the automatically controlled system 12 of magnetic suspension bearing, while the setting of DC/DC converter 26, so that magnetcisuspension
Light current power supply needed for floating controller 22 is all converted by DC/DC converter 26 by frequency changer direct current bus 18 come purpose
As long as being to accomplish that frequency changer direct current bus 18 has electricity, the automatically controlled system 12 of magnetic suspension bearing can be worked normally.Frequency converter direct current
It is parallel with DC capacitor 28 on bus 18, is used for storage energy.
A kind of magnetic suspension motor power-off protection method based on electric energy feedback, uses above-mentioned apparatus, comprising the following steps:
(1) a threshold value is set for the voltage of frequency changer direct current bus 18, the voltage of frequency changer direct current bus 18 is monitored, if the electricity
When pressure value is lower than this threshold value, then 30 power down of magnetic suspension motor is judged, execute step (2)；
(2) adjustment motor inverter 10 applies braking moment to the rotor of magnetic suspension motor 30, while rotor kinetic energy being converted to
At electric energy feedback to the frequency changer direct current bus 18 of motor inverter 10.
Specifically, step (2) includes so that the work of magnetic suspension motor 30 is existed by adjusting the output frequency of motor inverter 10
Fourth quadrant, i.e. revolving speed are positive, and torque is negative, and energy back flowing, rotor is changed into electricity by braking moment, mechanical energy at this time
Can, energy is flowed back to the DC side of motor inverter 10 by magnetic suspension motor 30, and is stored on DC capacitor 28, due to magnetic suspension
DC bus 24 is in parallel with frequency changer direct current bus 18, and therefore, the electric energy of feedback is capable of providing the automatically controlled system of magnetic suspension bearing
12 energy can support rotor, avoid falling for rotor the short time.
Further, maintain the voltage of frequency changer direct current bus 18 permanent by adjusting the output frequency of motor inverter 10
It is fixed.Specifically, as shown in Fig. 2, the step for maintaining the voltage of frequency changer direct current bus 18 constant are as follows: with frequency changer direct current bus 18
Voltage UDCThe constant output frequency as target control motor inverter 10, if the voltage U of frequency changer direct current bus 18DCIt is low
In setting value UrefIt then reduces output frequency and accelerates braking, if the voltage U of frequency changer direct current bus 18DCHigher than setting value UrefThen increase
Output frequency is added to slow down braking.In this way, making the energy of feedback just maintain the consumption of magnetic suspension bearing, to keep frequency converter
The voltage stabilization of DC bus 18 keeps rotor stability to suspend, and until rotor speed falls to zero, kinetic energy is exhausted, at this time
Rotor noenergy, falling will not damage.It is preferred that controlling the output frequency of motor inverter 10 using PI controller.
Based on the above description of the preferred embodiments of the present invention, through the above description, related personnel completely can be with
Without departing from the scope of the technological thought of the present invention', various changes and amendments are carried out.The technical scope of this invention
It is not limited to the contents of the specification, it is necessary to determine the technical scope according to the scope of the claims.
Claims (6)
1. a kind of magnetic suspension motor power-off protection apparatus based on electric energy feedback, including motor inverter and magnetic suspension bearing it is automatically controlled
System, the motor inverter include rectifier and inverter, and frequency converter direct current is connected between the rectifier and inverter
Bus, the automatically controlled system of magnetic suspension bearing include magnetic suspension power amplifier and magnetic suspension controller, the magnetic suspension power
Amplifier includes magnetic suspension DC bus, it is characterised in that: the frequency changer direct current bus and the magnetic suspension DC bus are straight
Connect parallel connection or the frequency changer direct current bus by after DC/DC converter voltage of transformation with the magnetic suspension DC bus phase
It is in parallel.
2. a kind of magnetic suspension motor power-off protection method based on electric energy feedback, which is characterized in that using as described in claim 1
Device, comprising the following steps:
(1) a threshold value is set for the voltage of the frequency changer direct current bus, monitors the voltage of the frequency changer direct current bus, if
When the voltage value is lower than this threshold value, then magnetic suspension motor power down is judged, execute step (2)；
(2) rotor for adjusting the motor inverter to magnetic suspension motor applies braking moment, while rotor kinetic energy being converted to
At electric energy feedback to the frequency changer direct current bus of the motor inverter.
3. a kind of magnetic suspension motor power-off protection method based on electric energy feedback according to claim 2, which is characterized in that
The step (2) includes so that magnetic suspension motor is worked in fourth quadrant by adjusting the output frequency of the motor inverter.
4. a kind of magnetic suspension motor power-off protection method based on electric energy feedback according to claim 3, which is characterized in that
Maintain the voltage of the frequency changer direct current bus constant by adjusting the output frequency of the motor inverter.
5. a kind of magnetic suspension motor power-off protection method based on electric energy feedback according to claim 4, which is characterized in that
The step for maintaining the voltage of the frequency changer direct current bus constant are as follows: constant as target control using the voltage of frequency changer direct current bus
The output frequency of motor inverter processed, the voltage if frequency changer direct current bus accelerate system lower than output frequency is reduced if setting value
It is dynamic, increase output frequency if the voltage of frequency changer direct current bus is higher than setting value and slows down braking.
6. a kind of magnetic suspension motor power-off protection method based on electric energy feedback according to claim 5, which is characterized in that
The output frequency of the motor inverter is controlled using PI controller.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811424629.3A CN109687395A (en) | 2018-11-27 | 2018-11-27 | A kind of magnetic suspension motor power-off protection apparatus and method based on electric energy feedback |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811424629.3A CN109687395A (en) | 2018-11-27 | 2018-11-27 | A kind of magnetic suspension motor power-off protection apparatus and method based on electric energy feedback |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109936324A (en) * | 2019-04-18 | 2019-06-25 | 佛山格尼斯磁悬浮技术有限公司 | Magnetic levitation apparatus |
| CN110224481A (en) * | 2019-06-12 | 2019-09-10 | 天津飞旋科技有限公司 | A kind of magnetic suspension bearing multiple redundancy power supply unit |
| CN111814211A (en) * | 2020-07-17 | 2020-10-23 | 深圳市易驱电气有限公司 | Frequency converter processing method and device |
| CN112039190A (en) * | 2020-07-27 | 2020-12-04 | 珠海格力电器股份有限公司 | Power supply control device and method of magnetic suspension system and magnetic suspension system |
| CN112152185A (en) * | 2020-10-20 | 2020-12-29 | 珠海格力电器股份有限公司 | Power supply control device and method of magnetic suspension system and magnetic suspension system |
| CN115264976A (en) * | 2022-07-13 | 2022-11-01 | 珠海格力电器股份有限公司 | Magnetic suspension centrifuge, control method and device thereof and storage medium |
| CN117526815A (en) * | 2024-01-04 | 2024-02-06 | 天津飞旋科技股份有限公司 | Power-down protection method and device for magnetic levitation motor and magnetic levitation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109936324A (en) * | 2019-04-18 | 2019-06-25 | 佛山格尼斯磁悬浮技术有限公司 | Magnetic levitation apparatus |
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| CN112039190A (en) * | 2020-07-27 | 2020-12-04 | 珠海格力电器股份有限公司 | Power supply control device and method of magnetic suspension system and magnetic suspension system |
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| CN115264976A (en) * | 2022-07-13 | 2022-11-01 | 珠海格力电器股份有限公司 | Magnetic suspension centrifuge, control method and device thereof and storage medium |
| CN115264976B (en) * | 2022-07-13 | 2023-09-29 | 珠海格力电器股份有限公司 | Magnetic suspension centrifuge, control method and device thereof and storage medium |
| CN117526815A (en) * | 2024-01-04 | 2024-02-06 | 天津飞旋科技股份有限公司 | Power-down protection method and device for magnetic levitation motor and magnetic levitation system |
| CN117526815B (en) * | 2024-01-04 | 2024-04-02 | 天津飞旋科技股份有限公司 | Power-down protection method and device for magnetic levitation motor and magnetic levitation system |
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