A protection device and method for high-speed maglev motor

Abstract

The application discloses a kind of protection device and method of high-speed magnetic suspension motor, including air pump assembly, pipeline assembly, radial magnetic suspension bearing, rotor, washer assembly, displacement sensor, axial magnetic suspension bearing and stator;Air pump assembly is communicated with pipeline assembly, radial magnetic suspension bearing is sequentially provided with rotor, washer assembly, axial magnetic suspension bearing and stator below, displacement sensor is symmetrically installed on the outer surface of rotor;Pipeline assembly includes straight pipe and ring pipe, one end of straight pipe is communicated with air pump assembly, and the other end is communicated with ring pipe, and ring pipe is installed on the inner side of magnetic suspension bearing;Magnetic suspension bearing is protected by washer assembly and ring pipe, so that the protection device has certain fault tolerance, the probability of accident is low, and the safety factor is higher;Since displacement sensor is arranged, the protection device has the ability of real-time monitoring, has real-time efficiency, and the device structure is simple, effectively reduces cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of magnetic suspension motor, in particular to a protection device and method of high-speed magnetic suspension motor. BACKGROUND

[0002] The magnetic suspension motor is a special motor with non-contact operation of stator and rotor, which uses the magnetic force of magnetic field to make the rotor suspended, and moves in the suspended state under the action of propulsion force; compared with the traditional motor, the stator and rotor of the magnetic suspension motor have no mechanical contact, have less wear and tear, can bring higher acceleration, and are convenient to maintain and repair, and can be well applied to various special occasions.

[0003] With the increasing maturity of magnetic suspension technology, the magnetic suspension motor is more and more widely applied in actual production. When the magnetic suspension motor is running at high speed, if a power failure fault occurs suddenly, the suspension magnetic field will disappear, and the rotor will directly fall, resulting in damage to the magnetic suspension bearing and the magnetic suspension motor.

[0004] The Chinese patent with publication number CN207573076 U discloses a standby power supply system of magnetic suspension motor, which includes an input end, an output end, a coil, a contactor, an uninterruptible power supply and a control and delay circuit. The above-mentioned protection method can eliminate the power failure caused by external power failure, effectively reduce the failure rate, and provide fault data for analyzing the fault reason. However, the protection circuit adopted by the above-mentioned patent is relatively complicated, the standby power supply needs to adopt uninterrupted alternating current, it is difficult to ensure that the standby power supply can supply power in time when the motor power supply is powered off, and the production cost and use cost are relatively high, and the use effect is poor. SUMMARY

[0005] In order to solve the problems that the rotor falls when the magnetic suspension motor is suddenly powered off during use, the magnetic suspension bearing is damaged, and the protection scheme in the prior art has poor use effect and high production cost, the present application provides a protection device and method of high-speed magnetic suspension motor.

[0006] The technical scheme of the present application is realized by the following scheme: a protection device of high-speed magnetic suspension motor, which comprises a gas pump assembly, a pipeline assembly, a radial magnetic suspension bearing, a rotor, a gasket assembly, a displacement sensor, an axial magnetic suspension bearing and a stator; the gas pump assembly is communicated with the pipeline assembly, the rotor, the gasket assembly, the axial magnetic suspension bearing and the stator are sequentially arranged below the radial magnetic suspension bearing, and the displacement sensor is symmetrically installed on the outer surface of the rotor; the pipeline assembly comprises a straight pipe and a ring pipe, one end of the straight pipe is communicated with the gas pump assembly, the other end is communicated with the ring pipe, the ring pipe is provided with two, and the two ring pipes are respectively installed on the inner sides of the radial magnetic suspension bearing and the axial magnetic suspension bearing.

[0007] By the above technical scheme, the displacement sensor is symmetrically installed on the outer surface of the rotor, used for monitoring the displacement distance of the rotor, when the displacement distance of the rotor exceeds the preset safe distance, the ring pipe plays a role of buffering and protecting the magnetic suspension bearing during the falling of the rotor; since the displacement sensor is arranged, the protection device has the real-time monitoring capability, has high real-time efficiency, and the device structure is simple, effectively reducing the cost.

[0008] As preferred, the air pump assembly comprises an air pump, a backup power supply and a backup power supply energizing wire, the air pump is connected with the backup power supply through the backup power supply energizing wire, and the other side of the air pump is communicated with the straight pipe.

[0009] By the above technical scheme: the air pump is connected with the backup power supply, when the motor is powered off, the backup power supply can be automatically started to inflate the straight pipe, or when the displacement sensor monitors that the displacement distance of the rotor exceeds the preset safe distance, the air pump also automatically inflates the straight pipe, the straight pipe is communicated with the ring pipe, and the ring pipe inflates to protect the magnetic suspension bearing.

[0010] As preferred, the gasket assembly is installed at the center position of the rotor, the gasket assembly comprises a rubber layer, an electroactive polymer layer, an energizing hole and an energizing wire, the rubber layer is located outside the electroactive polymer layer, the energizing hole is arranged on the electroactive polymer layer, the energizing wire is connected with the electroactive polymer layer through the energizing hole, and the energizing wire is connected with the motor to the same power supply.

[0011] By the above technical scheme, the energizing wire is connected with the electroactive polymer layer through the energizing hole, the electroactive polymer material has the characteristics of energizing contraction and the process is reversible, when the motor normally operates, the electroactive polymer is energized to contract, when the gasket loses electricity, the gasket will expand, buffer the impact force of the high-speed falling rotor, protect the magnetic suspension bearing, the gasket assembly and the ring pipe have a double protection effect on the magnetic suspension bearing, so that the protection device has a certain fault tolerance, the probability of accidents is low, and the safety factor is higher.

[0012] As preferred, the ring pipe is a flat hollow structure, and a flame retardant additive layer is arranged in the ring pipe.

[0013] As preferred, an automatic stop switch is arranged on the air pump, and the automatic stop switch is in communication connection with the pipeline assembly.

[0014] By the above technical scheme, the flame retardant additive layer arranged in the ring pipe effectively avoids the situation of easy fire and combustion under high-speed friction; and the automatic stop switch is arranged to automatically stop when the pressure in the pipeline assembly is too large, so as to avoid the situation of explosion due to too large pressure, so that the protection device has controllability.

[0015] The application also provides a protection method for a high-speed magnetic suspension motor, comprising the following operation steps:

[0016] A: presetting a safe offset distance of the rotor before starting the motor;

[0017] B: starting the motor and monitoring the offset distance of the rotor through the displacement sensor;

[0018] C: automatically starting the protection mode of the motor when the monitored offset distance of the rotor exceeds the set value.

[0019] 7. The protection method for the high-speed magnetic suspension motor according to claim 6, wherein the step C comprises:

[0020] c1: when the motor is powered off, the gasket assembly starts to expand under the action of the electroactive polymer, and the gasket assembly expands accordingly;

[0021] c2: the displacement sensor monitors that the offset distance of the rotor exceeds the preset safe offset distance;

[0022] c3: the air pump starts to work under the power supply of the standby power supply, inflates the ring pipe to make it expand.

[0023] 8. The protection method for the high-speed magnetic suspension motor according to claim 6, wherein after the step c3, the method further comprises automatically disconnecting the air pump and the standby power supply when an automatic stop switch on the air pump detects that the pressure in the pipe assembly reaches a stop pressure.

[0024] Through the above technical solution, the protection scheme adopts double protection and the protection process is controllable, the protection method has fault tolerance, the protection effect is good, real-time monitoring is more efficient, the structure is simple, and the cost is low.

[0025] In summary, the application has the following beneficial effects:

[0026] 1. The displacement sensor is symmetrically installed on the outer surface of the rotor, used for monitoring the offset distance of the rotor, when the offset distance of the rotor exceeds the preset safe distance, the ring pipe plays a role of buffering and protecting the magnetic suspension bearing during the falling process of the rotor; since the displacement sensor is arranged, the protection device has the ability of real-time monitoring, has real-time efficiency, and the device structure is simple, which effectively reduces the cost.

[0027] 2.The application is connected with the standby power supply by the air pump, when the motor is powered off, the standby power supply can automatically start to inflate the straight pipe, or when the displacement sensor monitors that the displacement of the rotor exceeds the preset safety distance, the air pump also automatically inflates the straight pipe, the straight pipe is connected with the ring pipe, the ring pipe inflates and expands to protect the magnetic bearing; the energized wire connects the electroactive polymer layer through the energized hole, the electroactive polymer material has the characteristics of energized contraction and the process is reversible, when the motor is running normally, the electroactive polymer is energized and contracted, the gasket expands when it loses power, buffers the impact force of the high-speed falling rotor, protects the magnetic bearing, the gasket assembly and the ring pipe double-protect the magnetic bearing, so that the protection device has a certain fault tolerance, the probability of accidents is low, and the safety factor is higher.

[0028] 3.The application effectively avoids the situation of easy fire and combustion under high-speed friction by setting a flame retardant additive layer in the ring pipe; at the same time, the automatic stop switch is set to automatically stop when the pressure in the pipeline assembly is too large to avoid the situation of explosion due to excessive pressure, so that the protection device has controllability. BRIEF DESCRIPTION OF DRAWINGS

[0029] Fig. 1 is the explosion test of the protection device structure of the high-speed magnetic suspension motor of the application;

[0030] Fig. 2 is a gasket assembly structure diagram of the application:

[0031] Fig. 3 is a connection structure diagram of the air pump assembly and the pipeline assembly of the application.

[0032] BRIEF DESCRIPTION OF DRAWINGS: 1, air pump assembly; 11, air pump; 12, standby power supply; 13, standby power supply energized wire; 2, pipeline assembly; 21, straight pipe; 22, ring pipe; 3, radial magnetic bearing; 4, rotor; 5, gasket assembly; 51, rubber layer; 52, electroactive polymer layer; 53, energized hole; 54, energized wire; 6, displacement sensor; 7, axial magnetic bearing; 8, stator. DETAILED DESCRIPTION

[0033] In order to more clearly understand the above-mentioned purposes, features and advantages of the application, the application will be further described below in combination with the drawings and examples.

[0034] In the following description, many specific details are set forth in order to provide a thorough understanding of the application, however, the application can also be implemented in other ways different from those described herein, therefore, the application is not limited to the specific embodiments disclosed in the following description, the application will be further described in detail below in combination with the drawings.

[0035] Example 1: a protection device for a high-speed magnetic suspension motor, as shown inFigs. 1-3 As shown, including air pump assembly 1, pipeline assembly 2, radial magnetic bearing 3, rotor 4, gasket assembly 5 displacement sensor 6 axial magnetic bearing 7 and stator 8; air pump assembly 1 and pipeline assembly 2 communication, radial magnetic bearing assembly 3 below in turn provided with rotor 4, gasket assembly 5, axial magnetic bearing 7 and stator 8, on the outer surface of the rotor 4 symmetry installed with displacement sensor 6; pipeline assembly 2 includes straight pipe 21 and ring pipe 22, one end of the straight pipe 21 and air pump assembly 1 communication another end and ring pipe 22 communication, ring pipe 22 is provided with two, two ring pipe 22 is respectively installed in the inner side of radial magnetic bearing 3 and axial magnetic bearing 7.

[0036] As shown in Fig. 3 The air pump assembly 1 includes air pump 11, standby power supply 12 and standby power supply power lead 13, air pump 11 is connected with standby power supply 12 through standby power supply power lead 13, air pump 11 another side and straight pipe 21 communication, provided with automatic stop switch on the air pump 11, automatic stop switch and pipeline assembly 2 communication connection, when the motor power off through standby power supply power lead 13 will be connected with standby power supply 12 and air pump 11, make air pump 11 restore power supply, air pump 11 to the straight pipe 21 and ring pipe 22 inflation makes it swell, or when the displacement sensor 6 monitoring the offset distance of rotor 4 more than the preset safety distance, air pump 11 also automatically inflate straight pipe 21 and ring pipe 22, the falling rotor 4 play a buffering effect to prevent magnetic bearing is damaged by high speed falling rotor 4; ring pipe 22 is flat hollow structure, in the ring pipe 22 added with flame retardant additives, through the setting of flame retardant additive layer in the ring pipe 22 effectively avoid the high speed friction under the condition of easy fire burning; at the same time set up automatic stop switch in monitoring the pressure in pipeline assembly 2 is too large when automatic stop to avoid the situation of pressure explosion, so that the protection device has controllability.

[0037] The gasket assembly 5 is installed at the center of the rotor 4, and the gasket assembly 5 is composed of two layers, including a rubber layer 51 and an electroactive polymer layer 52, and the gasket assembly 5 is further provided with an energizing hole 53 and an energizing wire 54, the rubber layer 51 is located outside the electroactive polymer layer 52, the energizing hole 53 is arranged on the electroactive polymer layer 52, the energizing wire 54 is connected to the electroactive polymer layer 52 through the energizing hole 53, and the energizing wire 54 is connected to the same power supply as the motor; the electroactive polymer layer 52 is composed of electroactive polymer, and the electroactive polymer has the characteristic of shrinking after being energized; in the use process, when the motor normally operates, the gasket assembly 5 shrinks and the air pump 11 is closed, and when a sudden power failure occurs, since the electroactive polymer layer is connected to the same power supply as the motor through the energizing wire, the electroactive polymer rapidly expands after power failure, so that the gasket assembly 5 expands, effectively reduces the impact force of the rotor 4 falling at high speed on the axial magnetic suspension bearing 7, reduces the risk of damage to the axial magnetic suspension bearing 7, and through the active and passive double protection of the gasket assembly 5 and the ring pipe 22, the protection device has a certain fault tolerance, the probability of accidents is low, and the safety factor is higher.

[0038] Embodiment 2: The embodiment also provides a protection method for the protection device of the high-speed magnetic suspension motor in embodiment 1,

[0039] A protection method for a high-speed magnetic suspension motor, comprising the following operation steps:

[0040] A: Before starting the motor, preset a safe offset distance of the rotor 4;

[0041] B: Start the motor and monitor the offset distance of the rotor 4 through the displacement sensor 6;

[0042] C: When it is monitored that the offset distance of the rotor 4 exceeds the set value, automatically start the protection mode of the motor.

[0043] Wherein step C comprises:

[0044] c1: When the motor is powered off, the electroactive polymer in the gasket assembly 5 starts to expand, and the gasket assembly 5 expands accordingly;

[0045] c2: The displacement sensor 6 monitors that the offset distance of the rotor 4 exceeds the preset safe offset distance:

[0046] c3: The air pump 11 starts to work under the power supply of the standby power supply 12, inflates the ring pipe 22 to make it expand.

[0047] c3: When the automatic stop switch of the air pump 11 detects that the pressure in the pipeline assembly 2 reaches the stop pressure, the power supply of the air pump 11 is automatically disconnected.

[0048] The above merely describes the preferred embodiments of the present application, but is not intended to limit the present application in other forms. Any person skilled in the art can make changes or modifications to the above disclosed technical contents into equivalent embodiments applied to other fields, but any simple modification or equivalent change made according to the technical essence of the present application to the above embodiments shall still fall within the protection scope of the present application.

Claims

1. A protection device for a high-speed magnetic levitation motor, characterized in that: The system includes an air pump assembly (1), a pipeline assembly (2), a radial magnetic bearing (3), a rotor (4), a washer assembly (5), a displacement sensor (6), an axial magnetic bearing (7), and a stator (8). The air pump assembly (1) is connected to the pipeline assembly (2). The rotor (4), washer assembly (5), axial magnetic bearing (7), and stator (8) are arranged sequentially below the radial magnetic bearing (3). The displacement sensor (6) is symmetrically installed on the outer surface of the rotor (4). The pipeline assembly (2) includes a straight pipe (21) and a ring pipe (22). One end of the straight pipe (21) is connected to the air pump assembly (1), and the other end is connected to the ring pipe (22). There are two ring pipes (22), which are respectively installed inside the radial magnetic bearing (3) and the axial magnetic bearing (7). The washer assembly (5) is installed at the center of the rotor (4). The washer assembly (5) includes a rubber layer (51), an electroactive polymer layer (52), an electrical hole (53), and an electrical conductor (54). The rubber layer (51) is located outside the electroactive polymer layer (52). The electrical hole (53) is provided on the electroactive polymer layer (52). The electrical conductor (54) is connected to the electroactive polymer layer (52) through the electrical hole (53). The electrical conductor (54) is connected to the motor via the same power source.

2. The protection device for the high-speed magnetic levitation motor according to claim 1, characterized in that: The air pump assembly (1) includes an air pump (11), a backup power supply (12) and a backup power supply energizing wire (13). The air pump (11) is connected to the backup power supply (12) through the backup power supply energizing wire (13), and the other side of the air pump (11) is connected to a straight pipe (21).

3. The protection device for the high-speed magnetic levitation motor according to claim 1, characterized in that: The ring tube (22) is a flat hollow structure, and a flame retardant additive layer is provided in the ring tube (22).

4. The protection device for the high-speed magnetic levitation motor according to claim 2, characterized in that: An automatic shutdown switch is provided on the air pump (11), and the automatic shutdown switch is communicatively connected to the pipeline assembly (2).

5. A protection method for a high-speed magnetic levitation motor, characterized in that, The protection device for the high-speed magnetic levitation motor described in claim 4 is used to protect the high-speed magnetic levitation motor, comprising the following steps: A: Preset the safe offset distance of the rotor (4) before starting the motor; B: Start the motor and monitor the distance of rotor (4) offset using displacement sensor (6); C: When the rotor (4) offset distance exceeds the set value, the protection mode for the motor is automatically activated; The specific construction steps in step C include: c1: When the motor is powered off, the gasket assembly (5) begins to expand under the action of the electroactive polymer, and the gasket assembly (5) expands accordingly. c2: The displacement sensor (6) detected that the offset distance of the rotor (4) exceeded the preset safe offset distance. c3: The air pump (11) starts working under the power supply of the backup power supply (12) to inflate the ring pipe (22).

6. The protection method for a high-speed magnetic levitation motor according to claim 5, characterized in that: The step c3 is followed by an automatic shutdown switch on the air pump (11) detecting that the pressure in the pipeline assembly (2) has reached the shutdown pressure and automatically disconnecting the air pump (11) from the backup power supply (12).

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