阅读说明：本技术 一种实现尖峰电磁转矩的超导感应加热装置电气传动控制方法 (Electric transmission control method for superconducting induction heating device for realizing peak electromagnetic torque ) 是由 杨平 周呈劼 黄建民 谭云海 吴启峰 饶志文 倪国华 李芳昕 于 2019-08-08 设计创作，主要内容包括：本发明涉及超导感应加热装置技术领域,且公开了一种实现尖峰电磁转矩的超导感应加热装置电气传动控制方法,具体包括以下步骤:S1:离合器结合,选择630kW变频器100rpm以下,并启动该变频器；S2:主异步电机及辅助异步电机同时启动,100rpm以上辅助电机通过离合器脱开,100rpm以下,主电机提供9000Nm转矩；S3:进行负载锭胚转动,并查看转速是否到100r/min；S4:离合器分离,保障其达到额定转速。该实现尖峰电磁转矩的超导感应加热装置电气传动控制方法,提出的主辅电机电气传动方法,辅助电机和主电机共同工作,主电机额定运行,无需过载,辅助电机负责提供大启动转矩,防止了负载电磁转矩峰值超出驱动电机的转矩过载能力而造成起动障碍,有效解决尖峰电磁转矩的问题。(The invention relates to the technical field of superconducting induction heating devices, and discloses an electric transmission control method of a superconducting induction heating device for realizing peak electromagnetic torque, which specifically comprises the following steps of S1, combining a clutch, selecting a frequency converter of 630kW below 100rpm, and starting the frequency converter; s2, starting the main asynchronous motor and the auxiliary asynchronous motor simultaneously, wherein the auxiliary motor is disengaged by the clutch above 100rpm, and the main motor provides 9000Nm torque below 100 rpm; s3, rotating the loaded ingot blank and checking whether the rotating speed reaches 100 r/min; and S4, separating the clutch to ensure that the clutch reaches the rated rotating speed. According to the electric transmission control method of the superconducting induction heating device for realizing the peak electromagnetic torque, the auxiliary motor and the main motor work together, the main motor runs at a rated speed and does not need to be overloaded, the auxiliary motor is responsible for providing large starting torque, starting obstacles caused by the fact that the peak value of load electromagnetic torque exceeds the torque overload capacity of the driving motor are prevented, and the problem of the peak electromagnetic torque is effectively solved.)

1. an electric transmission control method of a superconducting induction heating device for realizing peak electromagnetic torque is characterized by comprising the following steps:

S1, combining the clutch, selecting a frequency converter of 630kW below 100rpm, and starting the frequency converter;

s2, starting the main asynchronous motor and the auxiliary asynchronous motor simultaneously, disengaging the auxiliary motor above 100rpm through a clutch, providing 9000Nm torque by the main motor below 100rpm, and providing 16000Nm torque by the auxiliary motor through a reduction gearbox clutch;

S3, rotating the loaded ingot blank and checking whether the rotating speed reaches 100 r/min;

And S4, separating the clutch to ensure that the clutch reaches the rated rotating speed.

2. the method as claimed in claim 1, wherein the main motor is rated for operation without overload, and the motor is selected to 560kW in consideration of a certain margin.

3. The method as claimed in claim 1, wherein the auxiliary motor is used for providing large starting torque, and the motor is 185kW and the frequency converter is 215 kW.

4. The method for controlling the electric transmission of the superconducting induction heating device for realizing the peak electromagnetic torque according to claim 1, wherein when the rotating speed does not reach 100r/min, the rotating speed needs to be adjusted again, and when the rotating speed reaches 100r/min, the clutch is disengaged.

Technical Field

the invention relates to the technical field of superconducting induction heating devices, in particular to an electric transmission control method of a superconducting induction heating device for realizing peak electromagnetic torque.

Background

the electric transmission means that electric energy is converted into mechanical energy through a motor to drive various production machines, transportation vehicles and articles needing to move in life, in actual life, the peak value of load electromagnetic torque of a large-diameter aluminum ingot exceeds the torque overload capacity of a driving motor, which is a new problem in research and development of a superconducting direct current induction heater, and calculation shows that for an aluminum ingot with the diameter of 446mm, when a working magnetic field is more than 0.5T, a peak value point of the load electromagnetic torque appears when the aluminum ingot is started at a low rotating speed of about 20r/min, and the peak value point is about 3.6 times of rated load electromagnetic torque.

The peak point of the load electromagnetic torque is a great challenge for the design of a device driving system, the output torque overload capacity of a driving motor is usually only 2 times of the rated torque of the driving motor at most and cannot meet the design requirement of a megawatt superconducting direct current induction heater, according to the conventional motor model selection method and principle, the rated power of the motor is more than 3.6 times of the load power, for industrial grade superconducting induction heaters (which typically have heating powers above 300 kW), the drive motor and frequency converter power needs to be greater than 1MW, which increases the cost of the drive motor, frequency converter and drive system mechanical components, in the application field of the high-temperature superconducting induction heating device, the peak value of the load electromagnetic torque exceeds the torque overload capacity of the driving motor, therefore, the starting obstacle is caused, and therefore an electric transmission control method of the superconducting induction heating device for realizing the peak electromagnetic torque is provided.

Disclosure of Invention

The invention provides an electric transmission control method of a superconducting induction heating device for realizing peak electromagnetic torque, which has the advantages of realizing the peak electromagnetic torque, along with simple and reliable method and low cost, and solves the problems in the background art.

In order to achieve the aim, the invention provides the following technical scheme for realizing the electric transmission control method of the superconducting induction heating device for realizing the peak electromagnetic torque, which specifically comprises the following steps:

s1, combining the clutch, selecting a frequency converter of 630kW below 100rpm, and starting the frequency converter;

s2, starting the main asynchronous motor and the auxiliary asynchronous motor simultaneously, disengaging the auxiliary motor above 100rpm through a clutch, providing 9000Nm torque by the main motor below 100rpm, and providing 16000Nm torque by the auxiliary motor through a reduction gearbox clutch;

S3, rotating the loaded ingot blank and checking whether the rotating speed reaches 100 r/min;

And S4, separating the clutch to ensure that the clutch reaches the rated rotating speed.

Optionally, the main motor runs in a rated mode, overload is not needed, and a certain margin is considered, so that the selected motor is 560kW, for an industrial superconducting induction heater, the heating power is usually above 300kW, and when a main motor and an auxiliary motor are adopted for electric transmission, the power of a driving motor and the power of a frequency converter are both greater than 1 MW.

Optionally, the auxiliary motor is responsible for providing a large starting torque, and the motor is selected to be a 185kW motor, and the frequency converter is 215 kW.

optionally, if the rotating speed does not reach 100r/min, the rotating speed needs to be adjusted again, and if the rotating speed reaches 100r/min, the clutch is disengaged.

The invention provides an electric transmission control method of a superconducting induction heating device for realizing peak electromagnetic torque, which has the following beneficial effects:

1. according to the electric transmission control method of the superconducting induction heating device for realizing the peak electromagnetic torque, the auxiliary motor and the main motor work together, the main motor runs at a rated speed and does not need to be overloaded, the auxiliary motor is responsible for providing large starting torque, starting obstacles caused by the fact that the peak value of load electromagnetic torque exceeds the torque overload capacity of the driving motor are prevented, and the problem of the peak electromagnetic torque is effectively solved.

2. according to the electric transmission control method for the superconducting induction heating device for realizing the peak electromagnetic torque, a main motor and auxiliary motor electric transmission method is adopted, so that the operation steps of increasing the cost of a driving motor, a frequency converter and a driving system mechanical part when the power of the driving motor and the frequency converter is more than 1MW are avoided, and the production cost is reduced; when the rpm is more than 100, the auxiliary motor is disengaged through the clutch, when the rpm is less than 100, 9000Nm of torque is provided by the main motor, and 16000Nm of torque is provided by the auxiliary motor through the speed reduction box clutch.

drawings

FIG. 1 is a schematic flow chart of the present invention;

FIG. 2 is a schematic diagram of the working principle of the present invention;

fig. 3 is a schematic diagram of the process of the load electromagnetic torque and the load power changing with the rotating speed.

Detailed Description

the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-3, an electric transmission control method for a superconducting induction heating device for realizing a peak electromagnetic torque includes the following steps:

S1, combining the clutch, selecting a frequency converter of 630kW below 100rpm, and starting the frequency converter;

S2, a main asynchronous motor and an auxiliary asynchronous motor are started simultaneously, for an aluminum ingot with the diameter of 446mm, the electric transmission method of the main and auxiliary motors is provided, the auxiliary motor and the main motor work together, the main motor runs in a rated mode and does not need to be overloaded, the auxiliary motor is responsible for providing large starting torque, the problem that the peak value of load electromagnetic torque exceeds the torque overload capacity of a driving motor to cause starting obstacle is prevented, the problem of peak electromagnetic torque is effectively solved, the auxiliary motor above 100rpm is disengaged through a clutch, the main motor provides 9000Nm torque below 100rpm, the auxiliary motor provides 16000Nm torque through a reduction box clutch, and in the application field of the high-temperature superconducting induction heating device, the problem that the peak value of load electromagnetic torque exceeds the torque overload capacity of the driving motor to cause air-entraining starting obstacle can be effectively avoided;

S3, rotating the loaded ingot blank and checking whether the rotating speed reaches 100 r/min;

And S4, separating the clutch to ensure that the clutch reaches the rated rotating speed.

The method is characterized in that a main motor runs in a rated mode, overload is not needed, certain redundancy is considered, the selected motor is 560kW, the heating power of an industrial superconducting induction heater is generally more than 300kW, a main motor and auxiliary motor electric transmission method is adopted, when the power of a driving motor and the power of a frequency converter are both more than 1MW, the operation steps of increasing the cost of the driving motor, the frequency converter and mechanical parts of a driving system are avoided, the production cost is reduced, the method has the effects of simplicity in operation, reliability and low cost, and is suitable for large-scale popularization and application.

the auxiliary motor is responsible for providing large starting torque, the motor is 185kW, and the frequency converter is 215 kW.

And if the rotating speed does not reach 100r/min, the rotating speed needs to be adjusted again, and if the rotating speed reaches 100r/min, the clutch is separated.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.