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A Dahlander motor is a type of multispeed three-phase induction motor that varies the speed by altering the number of poles. The speed can be changed by switching between delta and double star connections in the windings.
Delta Connection is a brand name for Delta Air Lines, under which a number of individually owned regional airlines operate short- and medium-haul routes. Republic Airways is one of the contractors that operate Delta Connection flights with Embraer 170 and 145 aircraft.
Learn about the history, principle, and applications of three-phase electric power, a common type of alternating current used in electricity generation, transmission, and distribution. Find out how three-phase power enables efficient and economical power transfer and rotation using transformers and motors.
Learn about different types of motor controllers, such as starters, reversing starters, and adjustable-speed drives, and how they coordinate the performance of electric motors. Find out how motor controllers are used with direct current and alternating current motors, and what protection devices they include.
Learn about the manufacture of electromagnetic coils for various electrical devices, such as motors, transformers, and generators. Compare different types and structures of coil windings, such as wild, helical, and orthocyclic, and their advantages and disadvantages.
High-leg delta is a type of electrical service connection for three-phase electric power installations that provides both single and three-phase power from a transformer. It has a center-tapped phase that creates two 120 V pairs and one 208 V phase, which is called the high leg.
The most common three-phase system will have three hot legs, 208 V to each other and 120 V each to the neutral. An older, but still widely used, high-leg delta system uses three phases with 240 volts phase-to-phase for motor loads, and 120 volts for lighting loads by use of a center-tapped transformer; two of the phases are 120 volts to neutral ...
Learn about harmonics, sinusoidal waves whose frequency is an integer multiple of the fundamental frequency, in electric power systems. Find out how harmonics are caused by non-linear loads, classified by order and phase sequence, and affect power quality and equipment.