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Motors and Generators
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Electric Machine: Motor and Generator
stator & rotor wiring types: field winding: only provide field armature: the coil carries only load current (input & output)
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Types of electric machines
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Performance Characteristics of Electric Machines
Energy Conversion efficiency: energy losses Torque-speed characteristics Starting torque To provide better performance, a three-phase power are needed
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Three-Phase Power Phase voltage Balanced:
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Three-phase power: line voltage
It does not need forth wire (neutral connection
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Three-Phase Power: constant instantaneous power
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AC Synchronous Rotary Machines
AC machines are far more general than DC machines little torque pulsation in three-phase machines. Can achieve constant torque. Rotating magnetic field instead of DC magnetic field in DC machines. f: frequency of the driving field P: the number of poles
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