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Lec3 - Energy Conversion - Updated

Lec3 - Energy Conversion - Updated - Lec3 Power mechanical...

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341 - Electric Machinery Fundamentals MI - 1 Lec3 Power – mechanical & dc Power – ac Power factor – ac Mahesh S. Illindala

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341 - Electric Machinery Fundamentals MI - 2 Objectives Knowledge (repeating from memory): Identify the key factors that led to preferring alternating current (ac) over direct current (dc) Comprehension (demonstrating understanding of terms and concepts): Explain the concepts of apparent power, real power, power factor and reactive power Differentiate between Y- and D -connected 3- f systems Application (apply learned information to solve a problem): Calculate the apparent power, real power, reactive power and power factor for 1- f systems
Power Relationships – Mechanical and Electrical where w is the angular velocity (in rad./s) and torque t ind (in Nm) is defined as the product of the force applied and the smallest distance between the line of action of the force and the object’s axis of rotation P mech = t ind w P mech = F ind v For the linear dc machine, the mechanical power In the case of a rotating dc machine, the mechanical power is given by A dc voltage source supplying a load with resistance R P elec = e ind i For a linear dc machine, power converted Or the power supplied to the dc load is simply the product of the voltage across the load and the current flowing through it. P elec = V I For the dc circuit shown on the right side, power generated from the voltage source V is given by (A) (V) ( W ) Torque on an object ( watts ) ( watts ) ( watts ) ( watts ) Electrical Mechanical

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341 - Electric Machinery Fundamentals MI - 4 Sinusoidal Alternating Current (AC) Systems History: Direct current (dc) held the field for a number of years for a number of reasons.
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Lec3 - Energy Conversion - Updated - Lec3 Power mechanical...

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