CN213125650U - Power supply circuit for magnetic suspension bearing system of high-speed magnetic suspension permanent magnet synchronous motor - Google Patents
Power supply circuit for magnetic suspension bearing system of high-speed magnetic suspension permanent magnet synchronous motor Download PDFInfo
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- CN213125650U CN213125650U CN202022368129.1U CN202022368129U CN213125650U CN 213125650 U CN213125650 U CN 213125650U CN 202022368129 U CN202022368129 U CN 202022368129U CN 213125650 U CN213125650 U CN 213125650U
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- power supply
- magnetic suspension
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- permanent magnet
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Abstract
The utility model provides a power supply circuit for a magnetic bearing system of a high-speed magnetic levitation permanent magnet synchronous motor, which comprises a motor controller, a magnetic levitation bearing supporting permanent magnet synchronous motor, a rectification voltage-reducing circuit, a switching power supply, a power supply switching contactor of a magnetic bearing controller, an emergency power supply power contactor and a magnetic bearing system; the utility model has the advantages that: adopt the technical scheme of the utility model can guarantee magnetic suspension bearing life, can each equipment circuit keep apart each other again simultaneously, realize the safety and stability for the power supply of magnetic suspension bearing system.
Description
Technical Field
The utility model relates to an electrical engineering field, concretely relates to be used for high-speed magnetism to float PMSM magnetism to float bearing system supply circuit.
Background
At present, a high-speed synchronous motor is widely applied to rotating machinery, and a magnetic suspension bearing is a high-performance bearing which suspends a rotor in the air without mechanical friction by utilizing magnetic field force and has the advantages of no friction, no abrasion, no need of lubrication and sealing, low cost, less loss, long service life and the like, so that the magnetic suspension bearing is widely applied to the high-speed permanent magnet synchronous motor.
The key core component of the magnetic suspension bearing is a magnetic suspension bearing system consisting of a bearing body and a magnetic bearing controller. The bearing body suspends the rotor in the air by utilizing electromagnetic force, the suspension posture controlled by the controller is controlled and the rotor is kept stable, when the equipment rotates at high speed, the normal supply of the power supply of the bearing body and the controller must be ensured, and if the emergency power-off condition occurs, the bearing falls off to damage the magnetic suspension bearing body and the main shaft.
SUMMERY OF THE UTILITY MODEL
The utility model provides a new power supply circuit utilizes the electric energy that high-speed permanent magnet synchronous machine sent when the lazy turn as magnetism suspension bearing's emergency power. The power supply system can supply power to the magnetic bearing system under the condition of power failure and emergency power failure of a power grid, so that the bearing is prevented from falling, and a high-speed motor rotor system is protected; meanwhile, the energy consumption brake can be carried out on the high-speed motor, and the stop time of the high-speed motor is shortened. The purpose of safely and stably supplying power to the high-speed magnetic levitation permanent magnet synchronous motor is achieved. The damage to the motor is avoided when the power grid is in emergency power-off.
The utility model provides a power supply circuit for a magnetic bearing system of a high-speed magnetic levitation permanent magnet synchronous motor, which comprises a motor controller, a magnetic levitation bearing supporting permanent magnet synchronous motor, a rectification voltage-reducing circuit, a switching power supply, a power supply switching contactor of a magnetic bearing controller, an emergency power supply power contactor and a magnetic bearing system;
the second input port of the motor controller is connected with the second end of the normally open contact of the power supply switching contactor of the magnetic bearing controller;
the third input port of the motor controller is connected with the first end of the normally open contact of the power supply switching contactor of the magnetic bearing controller;
the fourth end of the normally open contact of the power supply switching contactor of the magnetic bearing controller is connected with the second input port of the switching power supply;
the third end of the normally open contact of the power supply switching contactor of the magnetic bearing controller is connected with the first input port of the switching power supply;
the positive output end of the switching power supply is connected with the positive input end of the magnetic suspension bearing system;
the negative output end of the switching power supply is connected with the negative input end of the magnetic suspension bearing system;
a first output port of the motor controller is connected with a U port of the magnetic suspension bearing support permanent magnet synchronous motor;
a second output port of the motor controller is connected with a V port of the magnetic suspension bearing support permanent magnet synchronous motor;
a third output port of the motor controller is connected with a W port of the magnetic suspension bearing support permanent magnet synchronous motor;
a second output port of the motor controller is connected with a first end of a normally closed contact of the emergency power supply power contactor;
a third output port of the motor controller is connected with a second end of the normally closed contact of the emergency power supply power contactor;
the first input port of the rectification voltage reduction circuit is connected with the fourth end of the normally closed contact of the emergency power supply power contactor;
the second input port of the rectification voltage reduction circuit is connected with the third end of the normally closed contact of the emergency power supply power contactor;
the positive output end of the rectification voltage reduction circuit is connected with the positive input end of the magnetic suspension bearing system;
and the negative output end of the rectification voltage reduction circuit is connected with the negative input end of the magnetic suspension bearing system.
Furthermore, the first input end of the motor controller, the second input end of the motor controller and the third input end of the motor controller are respectively connected with the motor circuit breaker.
The utility model has the advantages that: adopt the technical scheme of the utility model can guarantee magnetic suspension bearing life, can each equipment circuit keep apart each other again simultaneously, realize the safety and stability for the power supply of magnetic suspension bearing system.
Drawings
Fig. 1 is a four-quadrant operation diagram of the motor.
FIG. 2 is a relation between voltage/current and rotation speed when the three-phase high-speed permanent magnet synchronous motor is in idle power generation.
Fig. 3 is a main circuit of a power supply circuit of a magnetic bearing system of a high-speed magnetic levitation permanent magnet synchronous motor.
In the figure, 1 is a motor circuit breaker which mainly acts as the connection and disconnection of a motor power supply; 2 is a high-speed permanent magnet synchronous motor; a normally open contact of a power supply control contactor of the KM1 magnetic bearing controller is 3; the value of 4 is KM2 normally closed contact of the emergency power supply contactor; a KM1 magnetic bearing controller normal power supply contactor coil is 5; 6 is a rectification step-down circuit; 7, a magnetic suspension bearing system which comprises a magnetic suspension bearing controller and a magnetic suspension bearing body; 8 is a conventional switching power supply; 9 is a KM1 normally open contact; 10 is KM2 emergency power supply power contactor coil.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The components of the embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
The high speed permanent magnet synchronous machine can operate in four quadrants as shown in the following figures. As shown in figure 1 below.
In the stopping stage, the inertia high-speed permanent magnet synchronous motor stops after being idled for a period of time, and at the moment, the high-speed permanent magnet synchronous motor works in the second quadrant, namely, the forward rotation feedback state, and at the moment, the high-speed permanent magnet synchronous motor can output electric energy outwards.
When the three-phase high-speed permanent magnet synchronous motor is idled to generate power, the generating frequency and the voltage of the high-speed permanent magnet synchronous motor are basically proportional to the rotating speed, and the generating voltage is about 321V when the rotating speed is measured to be 21000rmp, about 267V when the rotating speed is up to 15000 and about 124V when the rotating speed is 6000. The power generation frequency 21000rmp was 700Hz, and 200Hz was used at 6000 rmp. The relationship between voltage/current and frequency when the three-phase high-speed permanent magnet synchronous motor idles for power generation is shown in the following figure 2, and it can be known from the figure that the voltage range is 120V-330vAC and the frequency range is 200-700Hz within the range of 6000-21000 rmp. Therefore, the high-speed permanent magnet synchronous motor can be used after being subjected to rectification after idling power generation.
The existing magnetic suspension bearing is widely applied to a high-speed permanent magnet synchronous motor due to the non-contact characteristic, the normal operation of a power supply system of the magnetic suspension bearing is ensured at any stage of high-speed rotation of the motor, particularly when a power grid fails, the motor idles for a period of time, and if the magnetic suspension bearing loses power and falls, the rotor system of the high-speed permanent magnet synchronous motor is possibly damaged. The power supply system can supply power to the magnetic bearing system under the condition of power failure and emergency power failure of a power grid, so that the bearing is prevented from falling, and a high-speed motor rotor system is protected; meanwhile, the energy consumption brake can be carried out on the high-speed motor, and the stop time of the high-speed motor is shortened. The purpose of safely and stably supplying power to the high-speed magnetic levitation permanent magnet synchronous motor is achieved. The damage to the motor is avoided when the power grid is in emergency power-off.
As shown in fig. 3, the present invention provides a power supply circuit for a magnetic bearing system of a high-speed magnetic levitation permanent magnet synchronous motor, which comprises a motor controller, a magnetic levitation bearing supporting permanent magnet synchronous motor, a rectification step-down circuit, a switching power supply, a magnetic bearing controller power supply switching contactor, an emergency power supply power contactor, and a magnetic levitation bearing system;
the second input port of the motor controller is connected with the second end of the normally open contact of the power supply switching contactor of the magnetic bearing controller;
the third input port of the motor controller is connected with the first end of the normally open contact of the power supply switching contactor of the magnetic bearing controller;
the fourth end of the normally open contact of the power supply switching contactor of the magnetic bearing controller is connected with the second input port of the switching power supply;
the third end of the normally open contact of the power supply switching contactor of the magnetic bearing controller is connected with the first input port of the switching power supply;
the positive output end of the switching power supply is connected with the positive input end of the magnetic suspension bearing system;
the negative output end of the switching power supply is connected with the negative input end of the magnetic suspension bearing system;
a first output port of the motor controller is connected with a U port of the magnetic suspension bearing support permanent magnet synchronous motor;
a second output port of the motor controller is connected with a V port of the magnetic suspension bearing support permanent magnet synchronous motor;
a third output port of the motor controller is connected with a W port of the magnetic suspension bearing support permanent magnet synchronous motor;
a second output port of the motor controller is connected with a first end of a normally closed contact of the emergency power supply power contactor;
a third output port of the motor controller is connected with a second end of the normally closed contact of the emergency power supply power contactor;
the first input port of the rectification voltage reduction circuit is connected with the fourth end of the normally closed contact of the emergency power supply power contactor;
the second input port of the rectification voltage reduction circuit is connected with the third end of the normally closed contact of the emergency power supply power contactor;
the positive output end of the rectification voltage reduction circuit is connected with the positive input end of the magnetic suspension bearing system;
and the negative output end of the rectification voltage reduction circuit is connected with the negative input end of the magnetic suspension bearing system.
In the normally open contact of the power supply switching contactor of the magnetic bearing controller, a second end and a fourth end are corresponding ports, a first end and a third end are corresponding ports, when the power supply switching contactor of the magnetic bearing controller is closed, the second end is communicated with the fourth end, and the first end is communicated with the third end; when the power supply switching contactor of the magnetic bearing controller is opened, the second end and the fourth end are in circuit breaking, and the first end and the third end are in circuit breaking;
in the normally closed contact of the emergency power supply power contactor, the second end and the fourth end are corresponding ports, the first end and the third end are corresponding ports, when the emergency power supply power contactor is closed, the second end is communicated with the fourth end, and the first end is communicated with the third end; when the emergency power supply contactor is opened, the second end and the fourth end are in circuit breaking, and the first end and the third end are in circuit breaking;
furthermore, the first input end of the motor controller, the second input end of the motor controller and the third input end of the motor controller are respectively connected with the motor circuit breaker.
As shown in fig. 3, the power supply switching contactor of the KM1 magnetic bearing controller mainly has the function of controlling the normal power supply of the magnetic bearing control system, a contact 3 of the KM1 contactor is connected to cables with numbers of L2 and L3 at the lower end of a motor breaker 1, and a normally closed main contact 4 of a power contactor KM2 is connected to terminals V and W of a high-speed motor.
Under the normal condition, when the motor circuit breaker 1 is closed, the coil of the bearing controller normal power supply control contactor KM1 is electrified, the KM1 magnetic bearing controller power supply switching contactor normally-open contact 3 is attracted, meanwhile, the KM1 normally-open contact 9 is closed, the KM2 coil 10 is electrified, and the KM2 normally-closed main contact 4 is disconnected. At the moment, the magnetic suspension bearing control system 7 is directly provided with power input after being converted by a power supply of a power grid through a switching power supply 8. If the power supply of the power grid fails or power is suddenly cut off, the KM1 contactor coil 5 loses power, the KM1 main contact 3 is opened, the KM1 normally-open contact 9 is opened, the KM2 coil 10 loses power, and the KM2 normally-closed main contact 4 is closed. At the moment, the high-speed permanent magnet synchronous motor 2 is also powered off and stops, the idling is started, and the high-speed permanent magnet synchronous motor works in the forward rotation feedback state of the second quadrant.
After the electricity generated by the idling of the high-speed permanent magnet synchronous motor 2 enters the rectification voltage reduction circuit 6 through the KM2 normally closed contact 4, the electricity is converted and output to the magnetic suspension bearing control system 7, so that the magnetic suspension bearing control system can continue to work normally, when the rotating speed of the high-speed permanent magnet synchronous motor is less than 6000rmp, the rotating speed reaches the safety protection rotating speed of the protection bearing, and the rotor of the high-speed permanent magnet synchronous motor can fall down to avoid damaging equipment and parts.
Although the present invention has been described in detail with reference to the general description and the specific embodiments, the present invention can ensure the service life of the magnetic suspension bearing, and can also isolate the circuits of each device from each other, so as to realize the safety and stability of the power supply for the magnetic suspension bearing system. Therefore, the modification or improvement on the basis of the spirit of the present invention is not left in the protection scope of the present invention.
Claims (2)
1. A power supply circuit for a magnetic bearing system of a high-speed magnetic suspension permanent magnet synchronous motor is characterized by comprising a motor controller, a magnetic suspension bearing supporting permanent magnet synchronous motor, a rectification voltage-reducing circuit, a switching power supply, a magnetic bearing controller power supply switching contactor, an emergency power supply power contactor and a magnetic suspension bearing system;
the second input port of the motor controller is connected with the second end of the normally open contact of the power supply switching contactor of the magnetic bearing controller;
the third input port of the motor controller is connected with the first end of the normally open contact of the power supply switching contactor of the magnetic bearing controller;
the fourth end of the normally open contact of the power supply switching contactor of the magnetic bearing controller is connected with the second input port of the switching power supply;
the third end of the normally open contact of the power supply switching contactor of the magnetic bearing controller is connected with the first input port of the switching power supply;
the positive output end of the switching power supply is connected with the positive input end of the magnetic suspension bearing system;
the negative output end of the switching power supply is connected with the negative input end of the magnetic suspension bearing system;
a first output port of the motor controller is connected with a U port of the magnetic suspension bearing support permanent magnet synchronous motor;
a second output port of the motor controller is connected with a V port of the magnetic suspension bearing support permanent magnet synchronous motor;
a third output port of the motor controller is connected with a W port of the magnetic suspension bearing support permanent magnet synchronous motor;
a second output port of the motor controller is connected with a first end of a normally closed contact of the emergency power supply power contactor;
a third output port of the motor controller is connected with a second end of the normally closed contact of the emergency power supply power contactor;
the first input port of the rectification voltage reduction circuit is connected with the fourth end of the normally closed contact of the emergency power supply power contactor;
the second input port of the rectification voltage reduction circuit is connected with the third end of the normally closed contact of the emergency power supply power contactor;
the positive output end of the rectification voltage reduction circuit is connected with the positive input end of the magnetic suspension bearing system;
and the negative output end of the rectification voltage reduction circuit is connected with the negative input end of the magnetic suspension bearing system.
2. The power supply circuit for a magnetic bearing system of a high-speed magnetic levitation permanent magnet synchronous motor as claimed in claim 1, wherein the first input terminal of the motor controller, the second input terminal of the motor controller and the third input terminal of the motor controller are respectively connected to a motor circuit breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022368129.1U CN213125650U (en) | 2020-10-22 | 2020-10-22 | Power supply circuit for magnetic suspension bearing system of high-speed magnetic suspension permanent magnet synchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022368129.1U CN213125650U (en) | 2020-10-22 | 2020-10-22 | Power supply circuit for magnetic suspension bearing system of high-speed magnetic suspension permanent magnet synchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213125650U true CN213125650U (en) | 2021-05-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022368129.1U Active CN213125650U (en) | 2020-10-22 | 2020-10-22 | Power supply circuit for magnetic suspension bearing system of high-speed magnetic suspension permanent magnet synchronous motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213125650U (en) |
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2020
- 2020-10-22 CN CN202022368129.1U patent/CN213125650U/en active Active
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