Frequency converter for 380V/50Hz motor

Contents

CONTENTS

Introduction

1 Overview of frequency converter analogues

2 Schematic Engineering

3 Calculation and selection of schematic elements

3.1 Calculation of frequency converter inverter

3.2 Calculation of power supply of control unit

4 Microcontroller Software Development

5 PCB Design

Conclusion

List of sources used

Appendix A (Mandatory) Microcontroller Program Listing

Graphic material (on individual sheets):

VKR FDO. 435221.182 E1 Frequency converter

for 380 V/50 Hz motor

Electrical structural diagram

VKR FDO. 435221.182 E2 Frequency converter

for 380 V/50 Hz motor

Electrical functional diagram

VKR FDO. 435221.182 E3 Frequency converter

for 380 V/50 Hz motor

Electrical schematic diagram

VKR FDO. 435221.182 Frequency converter

for 380 V/50 Hz motor

PCB Drawing

Paper

Graduation qualification work 47 pages, 10 drawings,

11 sources, 4 sheets of graphic material.

FREQUENCY CONVERTER, ASYNCHRONOUS MOTOR, MICROCONTROLLER, PRINTED CIRCUIT BOARD, POWER SUPPLY, INVERTER.

The design object is a frequency converter for a 380 V/50 Hz motor.

The purpose of the work is to develop a device based on a modern element base using a microcontroller.

During the work, an analysis of existing similar technologies and devices was carried out, structural, functional and schematic electrical diagrams, a printed circuit board were developed, and technical calculations were carried out.

The work was done in the text editor Microsoft Office World 2016 and is presented on a CD (in an envelope on the back of the cover).

Task

for graduation qualification work

1. Operating mode: Frequency converter for 380 V/50Hz motor

2. Purpose and application (devices: Asynchronous motor speed control for automated drive systems.

4. OPERATING REQUIREMENTS

4.1. Technical parameters:

- Input current 5.5 A;

- Output current 5.3 A;

- Output power 2.2 kW;

- Rated input voltage - 3-phase 380 V 50 Hz;

- Output frequency range 1400 Hz.

4.2. Operating conditions:

- Temperature 10 ° C... + 50 ° C;

- Air humidity 50 ± 5%.

4.3. Additional Conditions:

- Control method - pulse width modulation (PWM);

- Overall dimensions - no more than 250 × 150 × 100 mm;

- Filling factor by volume - not less than Kz = 0.5.

5. LIST OF SECTIONS TO BE DEVELOPED

5.1. For special part:

- Overview of frequency converter analogues.

- Schematic design.

- Calculation and selection of circuit elements and structure of the device.

- Development of software for the microcontroller.

- PCB design.

6. TO BE DEVELOPED IN OPERATION AS FOLLOWS

DOCUMENTATION:

6.1. Drawings:

(performed in accordance with GOST and ESKD)

Electrical structural diagram

Electrical functional diagram

Electrical schematic diagram

Printed circuit board

Introduction

VKR develops frequency converter for electric motor

380 V/50 Hz with RPM control. Control is implemented using pulse width modulation (PWM). The circuit is designed on the basis of a microcontroller.

With the increasing complexity of technological processes, it requires electric drives to adjust speed, position or moment. To this end, new methods for controlling the speed of DC and AC motors are being created. The control process is carried out according to a nonlinear algorithm, and for this it requires high computational power of the motor RPM control device. Designing frequency converters for asynchronous three-phase motors is an urgent task. Now there is a large selection of electronic components designed for use in automated drive control devices. It is possible for developers to design frequency converters designed for specific tasks with certain functions. Control via digital interfaces (RS485, RS-232, Ethernet) is possible.

The purpose of the graduation qualification work is to develop the hardware and software components of the device. To achieve this goal, the following objectives are being achieved:

review of existing analogues;

schematic design;

technical calculations and selection of the element base;

development of a microcontroller program;

development of a printed circuit board.

Conclusion

As a result, a frequency converter for a 380 V/50 Hz motor was designed to perform WCR. During the work, an analysis of existing similar devices was carried out, structural, functional and schematic electrical diagrams, a printed circuit board were developed, and technical calculations were carried out. Based on the results of the calculations, the selection of power IGBTtransistors and diodes of the inverter circuit of the frequency converter was made. The elements of the stabilized power supply unit of the microcontroller control board are calculated. As part of the software implementation, the control program algorithm is described and the microcontroller program itself is written in the MPLAB IDE. A distinctive advantage of the designed device is the simplicity of the circuit design, which is achieved through the use of a specialized PIC18F4331 microcontroller and the IR2130 chip.