CN203166827U - Special frequency converter for adjusting speed of battery electrical locomotive - Google Patents

Abstract

The invention relates to a special frequency converter for speed regulation of battery-type electric locomotives, which mainly solves the technical problems of insufficient stable output of existing frequency converters, insufficient smooth start, high energy consumption and the like. The main points of its technical solution are: when receiving the instructions from the controller, the fixed-point microcomputer controller (1) generates a three-phase pulse width modulation signal through software control, and then drives the insulated gate bipolar transistor drive board (2) to drive the insulated gate bipolar transistor. The pole transistor (3) generates three-phase pulse width modulation voltage to drive the AC motor, detects the motor current through the current sensor, performs dynamic flux control and torque current closed-loop adjustment through current vector conversion, and generates voltage space vector pulse width modulation signal , to achieve motor traction, feedback braking, realize reverse running of the motor through software, and realize non-contact control of the motor. When the protection circuit detects that the motor is over-current, the hardware immediately blocks the control signal to realize system protection. It is mainly used for battery type industrial and mining electric locomotives.

Description

Special frequency converter for speed regulation of battery electric locomotive

technical field

The utility model relates to a frequency converter, in particular to a special frequency converter for speed regulation of a storage battery electric locomotive.

Background technique

At present, most of the battery electric locomotives used in coal mines in my country use DC motors as traction motors, but the starting and speed regulation of DC electric locomotives must be connected in series with resistors in the circuit, and due to the actual needs of the production process, electric locomotives must often work at Variable-speed running state, therefore, a large amount of electric energy is wasted on the resistor. In addition, DC motors must be checked and maintained frequently due to their brushes and commutators, and commutation sparks are also not suitable for the gas environment of coal mines. Although coal mines can use explosion-proof DC motor locomotives, the cost is too high. In the past few years, some people also studied the method of using thyristor pulse speed regulation to solve the problem of speed regulation of DC electric locomotive. The use of thyristor pulse speed regulation can save part of the electric energy because there is no starting resistor. However, due to the poor technical performance of the key component thyristor at that time, it was easy to turn on but could not be turned off by itself, so it would appear out of control during the speed regulation process, so this technology was not popularized and applied on battery electric locomotives. Therefore, it is very necessary to improve the speed regulation method of the battery electric locomotive. In view of the fact that AC motors are simpler in structure, cheaper in cost, more reliable in operation, easier in maintenance, smaller in inertia and higher in efficiency than DC motors, if the battery electric locomotive is changed to AC drive, it will obviously bring a lot of benefits. And with the development of power electronics technology, especially the emergence of large-scale integrated circuits and computer control, high-performance AC frequency converter speed control system came into being. Therefore, the original DC motor used on the battery electric locomotive can be replaced by an AC motor, and then the speed can be adjusted by means of a frequency converter.

Contents of the utility model

The purpose of this utility model is to provide a non-contact control, which can realize the forward, backward, starting, traction, and feedback electric braking of the locomotive through the driver controller, and has perfect over-current, current-limiting, over-voltage, and under-voltage Protection measures, can output 2 times the rated torque, start smoothly without shaking, high-efficiency and energy-saving special inverter for speed regulation of battery-type electric locomotives.

The technical solution adopted by the utility model to solve its technical problems is: it includes a controller, a current sensor, and an AC motor, and is characterized in that: the controller is connected to a microcomputer controller 1, and the microcomputer controller 1 is connected to an insulated gate bipolar transistor. The drive board 2 is connected through a rectifier, and the IGBT drive board 2 is provided with six or more IGBTs 3, and the IGBT 3 is connected to the AC motor, and the AC motor is provided with The current sensor is connected to the microcomputer controller 1.

Microcomputer controller 1 described in the utility model can adopt TMS320LF2407A model.

The current sensor described in the utility model can adopt a Hall current sensor.

The microcomputer controller 1 described in the utility model is provided with a start and stop key 4, a forward and reverse key 5, a reset key 6, a temperature switch 7, a ready light 8, a running light 9, an alarm light 10, and a delay reset box 11 , Speed given key 12 and fan 13.

The beneficial effects of the utility model are: perfect protection measures, stable output, smooth start, high efficiency and energy saving.

Description of drawings

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

Fig. 2 is a schematic diagram of the principle diagram of the main electrical appliance of the present invention.

In the figure: 1-microcomputer controller, 2-insulated gate bipolar transistor driver board, 3-insulated gate bipolar transistor, 4-stop key, 5-forward and reverse rotation key, 6-reset key, 7-temperature Switch, 8-ready light, 9-running light. 10-alarm light, 11-delay reset box, 12-speed given key, 13-fan.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail.

Embodiment 1, the utility model comprises controller, electric current sensor, alternating current motor, it is characterized in that: controller 1 is connected with microcomputer controller 1, and microcomputer controller 1 is connected with insulated gate bipolar transistor drive plate 2 through rectifier, insulated The gate bipolar transistor driver board 2 is provided with six or more insulated gate bipolar transistors 3, the insulated gate bipolar transistors 3 are connected with the AC motor, and the AC motor is provided with a current sensor, and the current sensor and the microcomputer control When receiving instructions from the controller, the microcomputer controller 1 generates a three-phase pulse width modulation signal through software control, and then drives the IGBT 3 through the IGBT drive board 2 to generate three phases. The phase pulse width modulation voltage drives the AC motor, and the current sensor is used to detect the motor current, and the current vector transformation is used to perform dynamic flux control and torque current closed-loop adjustment to generate a voltage space vector pulse width modulation signal to realize motor traction and feedback braking. At the same time, the reverse operation of the motor is realized by software, so as to realize the non-contact control of the motor. When the protection circuit detects the overcurrent of the motor, the hardware immediately blocks the control signal to realize system protection. See Figures 1 through 2.

Embodiment 2, the microcomputer controller 1 described in the utility model can adopt the TMS320LF2407A model, and the core algorithm is to combine the most advanced DTC technology and the VVVF algorithm in the frequency converter industry, which is better than the single DTC and VVVF core control technology effect of ordinary frequency converters better. See Fig. 1 to Fig. 2, all the other are with embodiment 1.

Embodiment 3, the current sensor of the present invention can use a Hall current sensor to better detect the motor current, and perform dynamic flux control and torque current closed-loop adjustment through current vector transformation. Referring to Fig. 1 to Fig. 2, all the other are the same as above-mentioned embodiment.

Embodiment 4, the microcomputer controller 1 described in the utility model is provided with a start and stop key 4, a forward and reverse key 5, a reset key 6, a temperature switch 7, a ready light 8, a running light 9, an alarm light 10, a delay The time reset box 11, the speed given key 12 and the fan 13 make the work efficiency of the microcomputer controller 1 higher and more convenient to use. Referring to Fig. 1 to Fig. 2, all the other are the same as above-mentioned embodiment.

Claims (4)

1. A special frequency converter for speed regulation of battery-type electric locomotives, which includes a controller, a current sensor, and an AC motor. The bipolar transistor drive board (2) is connected through a rectifier, six or more insulated gate bipolar transistors (3) are arranged on the insulated gate bipolar transistor drive board (2), and the insulated gate bipolar transistor ( 3) Connect with the AC motor, the AC motor is provided with a current sensor, and the current sensor is connected with the microcomputer controller (1). 2. The special frequency converter for speed regulation of battery-type electric locomotive according to claim 1, characterized in that: the microcomputer controller (1) can adopt the model TMS320LF2407A. 3. The dedicated frequency converter for speed regulation of battery-type electric locomotives according to claim 1, characterized in that: the current sensor can be a Hall current sensor. 4. The dedicated frequency converter for speed regulation of battery-type electric locomotives according to claim 1, characterized in that: the microcomputer controller (1) is provided with start and stop keys (4), forward and reverse rotation keys (5), Reset key (6), temperature switch (7), ready light (8), running light (9), alarm light (10), delay reset box (11), speed setting key (12) and fan (13) .

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