EE 340 Spring 2011 - Howard R. Hughes College of …

Construction of synchronous machines In a synchronous generator, a DC current is applied to the rotor winding producing a rotor magnetic field.

  2011, Spring, Ee 340 spring 2011

Magnetic Circuits - UNLV

Ampère in 1826) relates the integrated magnetic field around a closed loop to the electric current passing through the loop. where H is the magnetic field intensity (measured in At/m) • At a distance r from the wire, ³ H .dl I ³ H .dl H .( 2Sr ) I

  Loops, Magnetic

Power Semiconductor Switching Devices

Classification of power semiconductor switches ... • The MCT is a power switch with a MOS gate for turn- on and turn-off. It

  Switch, Power, Semiconductors, Power semiconductor

Power Semiconductor Switching Devices - …

Ideal controllable Power Semiconductor Switch • When turned on, current can flow only in the direction of the arrow

  Switch, Semiconductors, Semiconductor switch

EE 340 – Transmission Lines

Electrical Characteristics • Transmission lines are characterized by a series resistance, inductance, and shunt capacitance per unit length. • These values determine the power-carrying capacity of the

  Line, Transmissions, Ee 340 transmission lines

Mechanics of Materials - University of Nevada, Las Vegas

ME 302 Materials Mechanics Introduction and Overview This is a fundamental course in all Civil and Mechanical Engineering Programs. Sometimes it is called:

  Material, Mechanics, Mechanics of materials, Materials mechanics

Resonant Converters - University of Nevada, Las Vegas

9-12 ZCS Resonant-Switch Converter By controlling the switch-off time (t 4 - t 3), i.e., the switching frequency, the average value of v oi, hence the average power supplied to the load

  Converter, Resonant

PowerPoint Presentation

The Laplace Transform Theorem: Initial Value If the function f(t) and its first derivative are Laplace transformable and f(t) Has the Laplace transform F(s), and the exists, then

  Transform, Laplace, The laplace transform

Sunlight and its Properties - Howard R. Hughes College of ...

Types of Radiations • Scattered sunlight (what makes the sky blue) is responsible for the light entering the north-facing windows. It is referred to as diffuse radiation.

  Properties, Sunlight, Sunlight and its properties

Obtain the z parameters for the network in Fig. 19.65.

* Find the impedance parameter equivalent of the network in Fig. 19.66. Figure 19.66 For Prob. 19.2. * An asterisk indicates a challenging problem. Chapter 19, Solution 2. Consider the circuit in Fig. (a) to get z11 and z21. 1 Ω I2 = 0 + V1 − 1 Ω I1 (a) Io + V2 − Io' 1 Ω 1 Ω 1 Ω 1 Ω 1 Ω 1 Ω

ELECTRONICALLY COMMUTATED MOTORS Part 1: History …

motor is around 60% at its design rated speed and load. This efficiency may decrease further, depending on load and operating speed. A large factor in PSC motor efficiency is rotor loss. In PSC motors, the magnetic field (north and south poles) of the rotor is created by an inductive magnetic force from the stator.

  Motor, Magnetic, Electronically, Commutated, Electronically commutated

Electric Motors and Drives

Magnetic Circuits 7 Magnetomotive force (MMF) 9 Electric circuit analogy 10 The air-gap 11 Reluctance and air-gap flux densities 12 Saturation 14 Magnetic circuits in motors 15 Torque Production 16 Magnitude of torque 18 The beauty of slotting 19 Specific Loadings and Specific Output 21 Specific loadings 21 Torque and motor volume 23

  Motor, Magnetic

Electric propulsion components with high power densities ...

Steps to achieve a light weight E-Motor design I 1. Electromagnetic design with high performance magnetic materials to the edge of physical boarders • High electric frequency to achieve highest torque density • Flat wire windings • Smart magnetic circle using Halbach array 2. Highly performing cooling

  High, With, Electric, Power, Component, Motor, Magnetic, Propulsion, Densities, Electric propulsion components with high power densities

INDUCTION MOTOR THEORY - PDHonline.com

Typical Induction Motor Rotors The magnetic field generated in the stator induces an EMF in the rotor bars. In turn, a current is produced in the rotor bars and shorting ring and another magnetic field is induced in the rotor with an opposite polarity of …

  Motor, Induction, Magnetic, Induction motors

Brushless DC Motors

– The magnetic axis of the bs winding is displaced ½ π from that of the as winding. – Assume that the positive direction of i bs is such that the positive magnetic axis of the bs winding is at φ s = ½ π where φ s is the angular displacement about the stator referenced to the as axis. – This is the stator configuration for a two-pole ...

  Magnetic