EMT 3103: Electrical Machine Drives I - Lecture Notes

Vocabulary flashcards covering the principles, definitions, components, and evaluation criteria for Electrical Machine Drives I.

EMT 3103

The course code for Electrical Machine Drives I.

EMT 2201

Circuit & Network theory I; a prerequisite for EMT 3103.

DC Machine

An electromechanical device used to convert electrical energy into mechanical energy or vice versa.

DC generator

A classification of DC machine that converts mechanical power to DC electrical power.

DC motor

A classification of DC machine that converts DC power to mechanical power.

Faraday’s first law of electromagnetic induction

States that when a conductor cuts a magnetic flux, an $EMF$ (electromotive force) is induced in that conductor.

Faraday’s second law of electromagnetic induction

States that the magnitude of generated $EMF$ in a conductor is equal to the rate of change of flux linkage.

Yoke or Frame

The outer part of the machine made of low reluctance magnetic material like iron and silicon steel that provides mechanical protection and a low reluctance path to the flux.

Pole shoe

An enlarged region of the pole that supports the field winding and spreads out the flux in the air gap uniformly.

Lamination

A technique used for poles, pole shoes, and armature cores to reduce eddy current losses.

Field Windings

Copper coils wounded on the pole core that, when energized, magnetize the poles to produce magnetic flux in the air gap.

Armature Core

A cylindrical, rotating part of the DC machine made of cast iron or cast steel with parallel slots to house the armature winding.

Armature Winding

Interconnected copper conductors placed in armature core slots; can be configured as lap winding or wave winding.

Commutator

A cylindrical drum of wedge-shaped copper segments that converts alternating current to direct current.

Mica

The insulating material used between the segments of a commutator.

Brushes

Rectangular components made of carbon (small machines) or electro-graphite (large machines) that carry current from armature conductors to the external circuit.

Shaft

The component used to transfer mechanical power from the motor to the load or from the prime mover to the generator.

Bearing

A component made of hard material like carbon steel used at the end of the shaft to reduce friction between rotating and stationary parts.

30%

The percentage weight of Assignments and CATs in the course evaluation.

70%

The percentage weight of the Final Examination in the course evaluation.