阅读说明：本技术 一种电机车调速变频器 (Speed-regulating frequency converter for electric locomotive ) 是由 陈燕珊 于 2019-11-28 设计创作，主要内容包括：一种电机车调速变频器,它主要是解决现有的变频器输出不够稳定,启动不够平滑,能耗较高等技术问题。其技术方案要点是：当接到司控器指令时,定点微机控制器(1)通过软件控制产生三相脉宽调制信号,再经绝缘栅双极型晶体管驱动板(2)驱动绝缘栅双极型晶体管(3),产生三相脉宽调制电压驱动交流电机,通过电流传感器,检测电机电流,通过电流矢量变换,进行动态磁通控制和力矩电流闭环调节,产生电压空间矢量脉宽调制信号,实现电机牵引,回馈制动,通过软件方式实现电机反向运行,实现电机无触点控制,当保护电路检测到电机过流时,立刻硬件封锁控制信号,实现系统保护。(The utility model provides an electric locomotive speed governing converter, it mainly solves current converter output not stable enough, starts not level and smooth enough, technical problem such as energy consumption is higher. The key points of the technical scheme are as follows: when receiving an instruction of a driver controller, a fixed point microcomputer controller (1) generates a three-phase pulse width modulation signal through software control, drives an insulated gate bipolar transistor (3) through an insulated gate bipolar transistor drive board (2), generates three-phase pulse width modulation voltage to drive an alternating current motor, detects motor current through a current sensor, performs dynamic magnetic flux control and torque current closed-loop regulation through current vector transformation, generates a voltage space vector pulse width modulation signal, realizes motor traction and feedback braking, realizes reverse operation of the motor through a software mode, realizes contactless control of the motor, and immediately blocks a control signal through hardware when a protection circuit detects overcurrent of the motor, so that system protection is realized.)

1. The utility model provides an electric locomotive speed governing converter, it includes driver's accuse ware, current sensor, AC motor, characterized by: the driver controller is connected with the microcomputer controller (1), the microcomputer controller (1) is connected with the insulated gate bipolar transistor driving board (2) through the rectifier, six or more insulated gate bipolar transistors (3) are arranged on the insulated gate bipolar transistor driving board (2), the insulated gate bipolar transistors (3) are connected with the alternating current motor, a current sensor is arranged on the alternating current motor, and the current sensor is connected with the microcomputer controller (1).

2. The electric locomotive speed regulation frequency converter of claim 1, wherein: the microcomputer controller (1) can adopt a model TMS320LF 2407A.

3. The electric locomotive speed regulation frequency converter of claim 1, wherein: the current sensor can adopt a Hall current sensor.

4. The electric locomotive speed regulation frequency converter of claim 1, wherein: the microcomputer controller (1) is provided with a starting stop key (4), a forward rotation and reverse rotation key (5), a reset key (6), a temperature switch (7), a preparation lamp (8), an operation lamp (9), an alarm lamp (10), a delay reset box (11), a speed setting key (12) and a fan (13).

Technical Field

The invention relates to a frequency converter, in particular to a speed-regulating frequency converter of an electric locomotive.

Background

At present, most storage battery electric locomotives used in coal mines in China adopt direct current motors as traction motors, but the direct current locomotives are started and speed-regulated by connecting resistors in series in a loop, and the electric locomotives are required to be operated in a variable speed running state frequently due to the actual requirement of a production process, so that a large amount of electric energy is consumed on the resistors and is wasted. In addition, the DC motor has the electric brush and the commutator which must be checked and maintained frequently, and the commutation spark is not suitable for the gas environment of the coal mine, although the coal mine can adopt an explosion-proof DC locomotive, the cost is high. In the last years, the speed regulation problem of the direct current electric locomotive is solved by a silicon controlled pulse speed regulation method. The pulse speed regulation by adopting the controllable silicon can save a part of electric energy because no starting resistor is arranged. However, the thyristor, which is a key element at that time, has poor technical performance, is easy to conduct but cannot be automatically turned off, so that the phenomenon of runaway can occur in the speed regulation process, and the technology cannot be popularized and applied to storage battery electric locomotives. Therefore, improvement of the speed regulation mode of the storage battery electric locomotive is very necessary. In view of the fact that the alternating current motor has simple structure, low cost, reliable work, convenient maintenance, small inertia and high efficiency compared with the direct current motor, if the storage battery electric locomotive is changed into alternating current dragging, the alternating current motor obviously can bring about a plurality of benefits. And with the development of power electronic technology, especially the appearance of large-scale integrated circuits and computer control, high-performance alternating-current frequency converter speed regulating systems are in operation. Therefore, the original direct current motor on the storage battery electric locomotive can be replaced by the alternating current motor, and the speed is regulated by adopting a method of regulating the speed by a frequency converter.

Disclosure of Invention

The invention aims to provide a contactless control, which can realize the forward and backward, starting, traction and feedback electric braking of a locomotive by a driver controller, has perfect over-current, current-limiting, over-voltage and under-voltage protection measures, can output rated 2-time torque, starts a smooth and jitter-free high-efficiency and energy-saving speed regulation frequency converter of an electric locomotive.

The technical scheme adopted by the invention for solving the technical problems is as follows: it includes driver's accuse ware, current sensor, AC motor, characterized by: the driver controller is connected with the microcomputer controller 1, the microcomputer controller 1 is connected with the insulated gate bipolar transistor driving board 2 through a rectifier, six or more than six insulated gate bipolar transistors 3 are arranged on the insulated gate bipolar transistor driving board 2, the insulated gate bipolar transistors 3 are connected with the alternating current motor, a current sensor is arranged on the alternating current motor, and the current sensor is connected with the microcomputer controller 1.

The microcomputer controller 1 of the invention can adopt model TMS320LF 2407A.

The current sensor can adopt a Hall current sensor.

The microcomputer controller 1 of the invention is provided with a start stop key 4, a forward and reverse rotation key 5, a reset key 6, a temperature switch 7, a ready lamp 8, an operation lamp 9, an alarm lamp 10, a delay reset box 11, a speed setting key 12 and a fan 13. The invention has the beneficial effects that: perfect protection measures, stable output, smooth start, high efficiency and energy conservation.

Drawings

Fig. 1 is a schematic diagram of a main control board of the present invention.

Figure 2 is a schematic illustration of the principle of the master electrical appliance of the present invention.

In the figure: 1-a microcomputer controller, 2-an insulated gate bipolar transistor driving board, 3-an insulated gate bipolar transistor, 4-a stop key, 5-a forward/reverse rotation key, 6-a reset key, 7-a temperature switch, 8-a preparation lamp and 9-an operation lamp. 10-alarm lamp, 11-time delay reset box, 12-speed setting key and 13-fan.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.