Energy-Efficient Electric Motors and their ApplicationsIn this revised and expanded edition, Howard E. Jordan explains-in a clear manner-the technology of energy efficient electric motors including motor losses, testing, and efficiency labeling. He also discusses how to calculate the return on investment for an energy efficient motor in addition to several other subjects related to effective motor applications. New chapters explore permanent magnet synchronous motors and transistor pulse-width-modulated inverters. Engineers, purchasing managers, and executives who make decisions on motor selection will find this an invaluable reference. |
Contents
| 1 | |
SELECTION AND APPLICATION OF ENERGY | 23 |
23 | 43 |
EFFICIENCY LABELING AND VERIFICATION | 61 |
POWER FACTOR | 75 |
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Common terms and phrases
acceleration adjustable-speed drive applications armature Autotransformer auxiliary winding brushless dc motor calculated capacitance capacitors cause coil conductor material connected cost cycle cycle savings dc drives Design B motors diagram displayed in Fig electric motors energy savings energy usage energy-efficient motor equivalent circuit Figure flux frequency friction and windage full-load harmonic horsepower horsepower rating I²r loss IEEE increase induction motor inrush current inverter iron losses kilowatts kW.sec load torque machine magnetic field method motor drives motor efficiency motor losses motor terminals motor winding motors operating multispeed motor negative-sequence NEMA output overload relay phase phasor poles polyphase power factor correction pump rated load reduced rotating rotor samarium self-excitation shown in Fig single-phase motor slip solid-state speed-torque curve starter starting torque stator stator winding stray-load loss surge switching synchronous motor synchronous speed Table thermostat thyristors tion torque typical usually versus volt-amperes waveforms