CN220393033U - Low-frequency emergency dragging device of permanent magnet gear motor direct-drive elevator - Google Patents
Low-frequency emergency dragging device of permanent magnet gear motor direct-drive elevator Download PDFInfo
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- CN220393033U CN220393033U CN202322081090.9U CN202322081090U CN220393033U CN 220393033 U CN220393033 U CN 220393033U CN 202322081090 U CN202322081090 U CN 202322081090U CN 220393033 U CN220393033 U CN 220393033U
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Abstract
The utility model provides a low-frequency emergency dragging device of a permanent magnet gear motor direct-drive elevator, which comprises a permanent magnet synchronous gear motor for driving an elevator spindle to rotate, wherein the input end of the permanent magnet synchronous gear motor is connected with a switching cabinet, the inside of the switching cabinet is provided with two high-voltage switching power switches and low-voltage switching power switches which are connected in parallel, the high-voltage switching power switches are connected with a high-voltage variable-frequency dragging system, the low-voltage switching power switches are connected with the low-voltage variable-frequency dragging system, and when the high-voltage variable-frequency dragging system fails, the switching power switches with the low-voltage variable-frequency dragging system are started, so that the low-speed emergency hoisting of the mine elevator is completed; according to the utility model, when the high-voltage variable frequency dragging system fails, the low-voltage variable frequency dragging system can be timely adopted to realize low-speed emergency lifting of the mine hoist, so that the occurrence of safety accidents is reduced.
Description
Technical Field
The utility model belongs to the technical field of control of mine hoist systems, and particularly relates to a low-frequency emergency dragging device of a permanent magnet gear motor direct-drive hoist.
Background
With the development of permanent magnet materials, permanent magnet synchronous motors are increasingly used. The traditional driving method of the mine hoist adopts an asynchronous motor acceleration and deceleration device structure to drive the main shaft device of the mine hoist, and the system can achieve the aim of low-speed driving, but has a plurality of defects such as complex structure, large volume, large noise, low efficiency, high failure rate and the like, so the permanent magnet synchronous motor low-speed direct-drive mine hoist is generated.
At present, the existing driving mode of the permanent magnet synchronous speed reducing motor for the mine hoist adopts a high-power high-voltage frequency converter for driving, the topological diagram of a main loop and a control part is shown as figure 4, namely, the main loop consists of a high-voltage feed cabinet +K, a four-quadrant high-voltage frequency converter +GBP, a permanent magnet synchronous motor +M and the like, and a speed measuring closed loop adopts a-BM rotary transformer or encoder element. The dragging mode adopts a one-to-one method, namely a frequency converter drives a permanent magnet synchronous motor.
However, in the actual production and use process, the high-power high-voltage permanent magnet synchronous motor direct-drive type mine hoist driven by the high-voltage frequency converter has the following risks:
1. the high-voltage frequency converter fails to cause system shutdown;
2. the fault of the high-voltage switch cabinet causes the high-voltage frequency converter to have no main loop power supply;
3. the power supply faults such as high-voltage power failure of a user cause no power supply of the high-voltage system;
4. abnormal power supply circuit causes that the main loop system can not work normally, etc.
Since the task of mine lifting systems is to lift coal, gangue, lowering materials, lifting personnel and various mining equipment. The method is a throat link of a mine production system, the occupied position in mine production is very important, and particularly when a vertical shaft is lifted, any fault is generated once the fault is light, the production is affected, serious loss of national property is caused, and even serious casualties of human bodies are caused.
Disclosure of Invention
The utility model aims to solve the technical problems, and provides a low-frequency emergency dragging device for a permanent magnet gear motor direct-drive hoisting machine, which can timely adopt a low-voltage variable-frequency dragging system to realize low-speed emergency hoisting of a mine hoisting machine when a high-voltage variable-frequency dragging system fails so as to reduce the occurrence of safety accidents.
The technical scheme adopted by the utility model is as follows: the utility model provides a permanent magnetism gear motor directly drives emergent drive arrangement of lifting machine low frequency, including the permanent magnetism synchronous gear motor who is used for driving lifting machine main shaft pivoted, permanent magnetism synchronous gear motor's input is connected with the switch cabinet, the inside of switch cabinet has two parallelly connected high voltage switching power switch and low voltage switching power switch, high voltage switching power switch links to each other with high voltage variable frequency drive system, low voltage switching power switch links to each other with low voltage variable frequency drive system, when high voltage variable frequency drive system breaks down, will start with the switching power switch of low voltage variable frequency drive system, thereby accomplish the emergent promotion of mine lifting machine's low speed.
The low-voltage variable frequency dragging system comprises a diesel generator, a step-up rectifier transformer, a low-frequency controller, a low-voltage frequency converter and a brake resistor, wherein the output end of the diesel generator is connected with the step-up rectifier transformer, the output end of the step-up rectifier transformer is connected with the low-frequency controller, the output end of the low-frequency controller is connected with the low-voltage frequency converter, and the low-voltage frequency converter is respectively connected with a low-voltage switching power switch and the brake resistor.
The high-voltage variable-frequency dragging system comprises a high-voltage feed cabinet and a low-voltage frequency converter, wherein the output end of the high-voltage feed cabinet is connected with the low-voltage frequency converter, and the output end of the low-voltage frequency converter is connected with a high-voltage switching power supply switch.
The speed measuring device is characterized by further comprising a speed measuring element which is respectively connected with the high-voltage variable frequency dragging system and the low-voltage variable frequency dragging system.
The hydraulic station is characterized by further comprising a low-voltage auxiliary power supply cabinet, a PLC (programmable logic controller) and an operation table, wherein the output end of the low-voltage auxiliary power supply cabinet is connected with a hydraulic station and a lubrication station of the mine hoist.
When the permanent magnet speed reducing motor direct-drive elevator low-frequency emergency dragging device works, the diesel generator provides a three-phase 380VAC power supply for the dragging system, when the conventional high-voltage variable-frequency dragging system fails, the diesel generator can be started, the diesel generator provides power for a control loop, the diesel generator supplies power for a low-frequency controller through a 380V/660V three-phase boosting rectifier transformer, then the low-frequency controller controls the low-voltage frequency converter to work, and under the condition that a low-frequency switching power supply switch is kept on, the permanent magnet synchronous speed reducing motor of the driving elevator works normally, so that the problem of safety accidents caused by the failure of the high-voltage variable-frequency dragging system is avoided.
The beneficial effects of the utility model are as follows:
according to the utility model, when the high-voltage variable frequency dragging system fails, the low-voltage variable frequency dragging system can be timely adopted to realize low-speed emergency lifting of the mine hoist, so that the occurrence of safety accidents is reduced.
Drawings
FIG. 1 is a system connection diagram of the present utility model;
FIG. 2 is a UF characteristic diagram of motor stator voltage versus frequency for control of the high frequency drag system of the present utility model;
FIG. 3 is a UF characteristic diagram of motor stator voltage versus frequency for the control of the low frequency drag system of the present utility model;
fig. 4 is a prior art system connection diagram.
The marks in the figure: 1. a high voltage feeder cabinet; 2. a high voltage frequency converter; 3. a switching cabinet; 301. a high voltage switching power switch; 302. a low voltage switching power switch; 4. a diesel generator; 5. a step-up rectifier transformer; 6. a low frequency controller; 7. a low voltage frequency converter; 8. a brake resistor; 9. a permanent magnet synchronous speed reducing motor; 10. an operation table; 11. a PLC controller; 12. a low-voltage auxiliary power supply cabinet; 13. a hydraulic station; 14. and (5) a lubrication station.
Description of the embodiments
The following describes the embodiments of the present utility model in further detail with reference to the drawings.
As shown in the figure, a permanent magnet gear motor directly drives emergent drive device of lifting machine low frequency, including being used for driving the pivoted permanent magnet synchronous gear motor 9 of lifting machine main shaft, permanent magnet synchronous gear motor 9's input is connected with switch cabinet 3, switch cabinet 3's inside has two parallelly connected high-voltage switch power switch 301 and low-voltage switch power switch 302, high-voltage switch power switch 301 links to each other with high-voltage variable frequency drive system, high-voltage variable frequency drive system includes high-voltage feed cabinet 1 and low-voltage inverter 7, the output of high-voltage feed cabinet 1 links to each other with low-voltage inverter 7, low-voltage inverter 7 output links to each other with high-voltage switch power switch 301, more specifically still include the speed measuring component that links to each other with high-voltage variable frequency drive system and low-voltage variable frequency drive system respectively, this speed measuring component can adopt-BM to revolve or encoder real-time supervision motor rotor's magnetic pole position and rotor's rotational speed, still include low-voltage auxiliary power cabinet 12, PLC controller 11 and operation panel 10, the output of low-voltage auxiliary power cabinet 12 is connected with mine lifting machine's hydraulic station 13 and lubrication station 14.
The high-voltage frequency converter 2 adopts vector control with a speed sensor, the magnetic pole position of the motor rotor and the rotating speed of the rotor are monitored in real time through a-BM rotary transformer or an encoder, and are fed back to the high-voltage frequency converter 2, and the high-voltage frequency converter 2 is used for control, so that the requirement of driving a low-speed direct-connection synchronous motor is met; the vector control algorithm with the speed sensor has the characteristics of large starting torque and good low-speed characteristic, and is suitable for the heavy-load starting requirement of constant-torque loads such as mine hoist and the like. When the motor is in an electric state, the high-voltage frequency converter 2 rectifies the alternating current power supply of the power grid into direct current, and the direct current is inverted into alternating current power supply with specified frequency and specified voltage by the inversion part to control the motor. When the motor is in a power generation state, the inversion part of the high-voltage frequency converter 2 can complete a rectification function, and the rectification feedback module of the high-voltage frequency converter 2 inverts according to the frequency phase of the power grid so as to feed back high-quality electric energy to the power grid. Meanwhile, the power unit also has fault protection functions of overvoltage, undervoltage, voltage equalizing, overcurrent, open-phase, overheat and the like. The +SA low-voltage auxiliary power cabinet 12 provides 380V power supply, 220V auxiliary power supply, 110V auxiliary power supply and 24VDC auxiliary power supply for the whole control system and controls auxiliary machines of the hydraulic station 13, the lubrication station 14 and other systems, the +DS PLC control cabinet completes all process control and logic control functions of the elevator, and the +PA operating console 10 is used for operation observation of drivers and monitoring and recording of a disc storage by an upper monitoring computer.
The low-voltage switching power supply switch 302 is connected with a low-voltage variable frequency dragging system, when the high-voltage variable frequency dragging system fails, the switching power supply switch of the low-voltage variable frequency dragging system is started, so that low-speed emergency lifting of the mine hoist is completed, the low-voltage variable frequency dragging system comprises a diesel generator 4, a step-up rectifier transformer 5, a low-frequency controller 6, a low-voltage frequency converter 7 and a brake resistor 8, the output end of the diesel generator 4 is connected with the step-up rectifier transformer 5, the output end of the step-up rectifier transformer 5 is connected with the low-frequency controller 6, the output end of the low-frequency controller 6 is connected with the low-voltage frequency converter 7, and the low-voltage frequency converter 7 is respectively connected with the low-voltage switching power supply switch 302 and the brake resistor 8.
When the permanent magnet speed reducing motor direct-drive elevator low-frequency emergency dragging device works, the diesel generator 4 provides a three-phase 380VAC power supply for the dragging system, when a conventional high-voltage variable-frequency dragging system fails, the diesel generator 4 can be started, the diesel generator 4 provides power for a control loop, the low-frequency controller 6 is powered by the 380V/660V three-phase boosting rectifier transformer 5, then the low-frequency controller 6 controls the low-voltage frequency converter 7 to work, and under the condition that a low-frequency switching power supply switch is kept on, the permanent magnet synchronous speed reducing motor 9 of the driving elevator works normally, so that the problem of safety accidents caused by the failure of the high-voltage variable-frequency dragging system is avoided.
The motor drag control system of the conventional high-voltage frequency converter 2 of the permanent magnet synchronous speed reducing motor 9 generally adopts FOC vector control, because the permanent magnet rotor generates a constant electromagnetic field, and when the stator is electrified with three-phase symmetrical sine wave alternating current, a rotating magnetic field is generated. The two magnetic fields interact to generate electromagnetic force to drive the rotor to rotate. If the frequency and phase of the stator three-phase power supply can be changed, the rotation speed and position of the rotor can be changed. Therefore, the control of the three-phase permanent magnet synchronous motor is similar to that of the three-phase asynchronous motor, and vector control is adopted. A position sensor BM2 is mounted on the rotor of the three-phase permanent magnet synchronous motor to measure the position of the rotor. Thus, the actual position of the rotor and the magnetic flux position of the rotor can be detected, so that the vector control of the three-phase permanent magnet synchronous motor is simpler than that of the three-phase asynchronous motor.
The permanent magnet synchronous motor 9 is generally rated at a frequency of about 50HZ, and will be described by taking 50HZ as an example. The characteristic curve of the stator voltage-frequency UF when the conventional motor drag control system of the high-voltage frequency converter 2 adopts FOC vector control is shown in fig. 2.
The permanent magnet rotor generates a constant electromagnetic field, and the magnetic flux and rated torque of the permanent magnet synchronous speed-reducing motor 9 remain unchanged in a linear relationship. At this time, the UF characteristic value c=u/F of the permanent magnet synchronous motor 9 is defined.
The above UF characteristic value is also followed when the permanent magnet synchronous reducing motor 9 adopts low frequency emergency dragging, and only if the characteristic value C is ensured to be unchanged, the selected frequency converter can drive the motor to run under various load conditions, namely c=u1/F1.
The rated voltage of the low-frequency emergency dragging frequency converter is generally selected to be 7.5% -12% of the rated voltage of the permanent magnet synchronous speed reducing motor 9, and the rated voltage of the low-frequency emergency dragging frequency converter can be 450V-690V by taking the permanent magnet synchronous speed reducing motor 9 with the rated voltage of 6KV as an example, and C is a constant value according to C=U1/F1, so that the higher the selected voltage is, the higher the corresponding low-frequency operating frequency and operating speed are relatively.
As shown in FIG. 3, the rated voltage of 6KV, 660V is selected at low frequency, and the operating frequency corresponds to 0-5.5HZ. When parameters of the frequency converter are debugged, rated voltage is 660V, rated frequency is 5.5HZ, rated power of the motor is 660Pe/6000, namely 11% of power of the permanent magnet synchronous speed reduction motor 9, and other parameters of the motor are unchanged.
Claims (5)
1. A permanent magnet gear motor directly drives emergent drive device of lifting machine low frequency which characterized in that: the low-speed emergency lifting device comprises a permanent magnet synchronous gear motor for driving a main shaft of a lifting machine to rotate, wherein the input end of the permanent magnet synchronous gear motor is connected with a switching cabinet, the inside of the switching cabinet is provided with two high-voltage switching power switches and low-voltage switching power switches which are connected in parallel, the high-voltage switching power switches are connected with a high-voltage variable frequency dragging system, the low-voltage switching power switches are connected with the low-voltage variable frequency dragging system, and when the high-voltage variable frequency dragging system breaks down, the switching power switches of the low-voltage variable frequency dragging system are started, so that the low-speed emergency lifting of the mine lifting machine is completed.
2. The low-frequency emergency dragging device of the permanent magnet gear motor direct-drive elevator according to claim 1, wherein the low-frequency emergency dragging device is characterized in that: the low-voltage variable frequency dragging system comprises a diesel generator, a step-up rectifier transformer, a low-frequency controller, a low-voltage frequency converter and a brake resistor, wherein the output end of the diesel generator is connected with the step-up rectifier transformer, the output end of the step-up rectifier transformer is connected with the low-frequency controller, the output end of the low-frequency controller is connected with the low-voltage frequency converter, and the low-voltage frequency converter is respectively connected with a low-voltage switching power switch and the brake resistor.
3. The low-frequency emergency dragging device of the permanent magnet gear motor direct-drive elevator according to claim 1, wherein the low-frequency emergency dragging device is characterized in that: the high-voltage variable-frequency dragging system comprises a high-voltage feed cabinet and a low-voltage frequency converter, wherein the output end of the high-voltage feed cabinet is connected with the low-voltage frequency converter, and the output end of the low-voltage frequency converter is connected with the high-voltage switching power supply switch.
4. The low-frequency emergency dragging device of the permanent magnet gear motor direct-drive elevator according to claim 1, wherein the low-frequency emergency dragging device is characterized in that: the speed measuring device also comprises a speed measuring element which is respectively connected with the high-voltage variable frequency dragging system and the low-voltage variable frequency dragging system.
5. The low-frequency emergency dragging device of the permanent magnet gear motor direct-drive elevator according to claim 1, wherein the low-frequency emergency dragging device is characterized in that: the hydraulic station and the lubrication station of the mine hoist are connected to the output end of the low-voltage auxiliary power supply cabinet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322081090.9U CN220393033U (en) | 2023-08-04 | 2023-08-04 | Low-frequency emergency dragging device of permanent magnet gear motor direct-drive elevator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322081090.9U CN220393033U (en) | 2023-08-04 | 2023-08-04 | Low-frequency emergency dragging device of permanent magnet gear motor direct-drive elevator |
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| CN220393033U true CN220393033U (en) | 2024-01-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118017902A (en) * | 2024-04-09 | 2024-05-10 | 洛阳九亿重工集团有限公司 | Low-frequency emergency dragging device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118017902A (en) * | 2024-04-09 | 2024-05-10 | 洛阳九亿重工集团有限公司 | Low-frequency emergency dragging device |
| CN118017902B (en) * | 2024-04-09 | 2024-06-18 | 洛阳九亿重工集团有限公司 | Low-frequency emergency dragging device |
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