Electrical MotorsLaajuus (3 ECTS)

Objective

The student understands the electrical motor operation principle and is able to make the motor selection according to the load torque requirements. He/she is familiar with the essential electrical motor terminology and ratings.

The student knows the most common induction motor direct and controlled drive types. The student can evaluate how the duty type and ambient conditions affect the motor loading capacity.

Content

1. Structure and operation, equivalent circuit
2. Motor types and applications
3. Loading capacity and torque curve
4. Ratings and standards
5. Induction motor DOL and controlled drives
6. Motor selection

Qualifications

Electromagnetism
DC Circuits

Assessment criteria, satisfactory (1)

1. The student is able to explain the operating principle of an electrical motor as a torque source.
2. The student can name the most common motor types and their applications.
3. The student knows the significance of the torque in motor selection and is able to use torque curves for motor application requirement evaluation.
4. The student can use rating plate values to define the motor power, speed, torque and electrical rated values, efficiency, duty type and shaft direction.
5. The student knows the most common induction motor DOL and controlled drive types and understands the reasons for their usage.
6. The student can make the preliminary motor selection according to the loading torque and knows the need for a more detailed analysis before the final selection.

Assessment criteria, good (3)

In addition to the previous ones:
1. The student knows the most common motor types and is able to justify the use of different motors with different applications.
2. By using the torque curves the student is able to evaluate the suitability of the motor and estimate acceleration times.
3. By using the motion data/profile the student is able to determine graphically rotation, angular velocity and angular acceleration of the motor and the relation to the torque required by the motor.
4. The student can make the preliminary motor selection based on the torque and motion requirements and he or she can take into consideration other factors with an impact to the motor dimensioning

Assessment criteria, excellent (5)

In addition to the previous ones:
1. By using the motion data/ profile the student is able to calculate numerically/ analytically rotation, angular velocity and angular acceleration of the motor and the relation to the torque required by the motor.
2. The student can make the motor selection based on the torque and motion requirements taking into consideration other factors with an impact to the motor dimensioning.