Frequency ConvertersLaajuus (3 ECTS)

Objective

The aim of this course is that after completion of the course the student will be able to design an electric drive very accurately. After completion of the course the student understands the basic structures of the frequency converters, he/she knows what components the manufacturers use in net bridges, intermediate circuit and motor bridges. The student is able to select the correct bridges to be used for each application. The student will be familiar with the structures of controlled rectifiers, inverters and their operating principles and the basics of the open and closed loop controls related to frequency converters.

The contents and the assessment criteria of the course may be different depending on the teacher of the course.

Content

1. Rectifiers and inverters
2. Structures of frequency converters
3. Basics of open and closed loop controls
4. The dimensioning of an electrical drive in various applications
5. Different methods of decelerating an electric drive

Assessment criteria, satisfactory (1)

1. The student is familiar with the rectifiers and inverters (net bridges and motor bridges) used in frequency converters as well as the structure of the intermediate circuit
2. The student understands the various differences in the structures of the frequency converters
3. The student understands the differences between open and closed loop controls
4. The student can aided design controlled electric drive for simple applications
5. The student is familiar with various methods of decelerating an electric drive

Assessment criteria, good (3)

1. As level 1
2. As level 1
3. As level 1
4. The student is able to design an electric drive for various applications independently, by using the manufacturers’ material
5. The student is able to ensure the compatibility of a brake chopper and dimension a brake resistor on the basis of the application

Assessment criteria, excellent (5)

1. As level 1
2. As level 1
3. As level 1
4. As level 3
5. The student is able to make an economic comparison between the different frequency converters based on the application