Introduction to Electric DrivesLaajuus (6 ECTS)

Objective

The student knows what an electric drive is and is familiar with the essential terminology and graphical symbols of electric drives. He/she knows the structure and operation principles of the most common DOL and controlled drives and is familiar with the basic drive selection and dimensioning procedures.

Content

1. Electric drive definition and applications
2. DOL motor drive components and functions, the most common main and control circuit graphical symbols
3. Frequency converter structure, operational principle and use
4. Electric drive selection and dimensioning
5. Practical training and measurements in laboratory

Assessment criteria, satisfactory (1)

1. The student can define an electric drive and knows the most common drive applications.
2. The student knows the essential functions and components in a DOL drive. The student can read simple electrical drawings to determine drive functionality.
3. The student can describe the structure and operation principle of a frequency controller with DC-voltage intermediate circuit.
4. The student knows the basic rules and procedures for electric drive selection and dimensioning.
5. The student can perform electric drive voltage, current, power and power quality measurements and make a report based on measurement results and observations.

Assessment criteria, good (3)

1. The student is able to classify the most common drive applications.
2. The student can design main and control circuit with suitable protection for a simple motor drive application.
3. The student can describe key components and operating principle of a frequency converter with DC-voltage intermediate circuit.
4. The student is able to dimension the components of a simple electric drive application.
5. The student can perform the commissioning of a frequency converter and squirrel cage motor drive.

Assessment criteria, excellent (5)

1. The student is able to estimate the dynamic behaviour of the most common drive applications for motor and brake dimensioning.
2. The student can design main and control circuit with suitable protection for different types of motor drive applications.
3. The student knows key components and operating principle of different frequency converter types.
4. The student is able to dimension the components of different kind of electric drive applications.
5. The student can independently prepare and perform the commissioning of a frequency converter and squirrel cage motor drive.