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2. Dahlander pole changing motor - Wikipedia

   en.wikipedia.org/wiki/Dahlander_pole_changing_motor

   A Dahlander motor (also known as a pole changing motor, dual- or two speed-motor) is a type of multispeed three-phase induction motor, in which the speed of the motor is varied by altering the number of poles; this is achieved by altering the wiring connections inside the motor.

3. Two-phase electric power - Wikipedia

   en.wikipedia.org/wiki/Two-phase_electric_power

   A simplified diagram of a two-phase alternator [1] Two-phase electrical power was an early 20th-century polyphase alternating current electric power distribution system. Two circuits were used, with voltage phases differing by one-quarter of a cycle, 90°. Usually circuits used four wires, two for each phase.

4. Induction motor - Wikipedia

   en.wikipedia.org/wiki/Induction_motor

   For example; a single-phase motor with 3 north and 3 south poles, having 6 poles per phase, is a 6-pole motor. A three-phase motor with 18 north and 18 south poles, having 6 poles per phase, is also a 6-pole motor. This industry standard method of counting poles results in the same synchronous speed for a given frequency regardless of polarity.

5. Synchronous motor - Wikipedia

   en.wikipedia.org/wiki/Synchronous_motor

   The number of pole-pairs is 2, so the synchronous speed is: = = A three-phase, 12-pole (6-pole-pair) synchronous motor is operating at an AC supply frequency of 60 Hz. The number of pole-pairs is 6, so the synchronous speed is:

6. Resolver (electrical) - Wikipedia

   en.wikipedia.org/wiki/Resolver_(electrical)

   Some types of resolvers include both types, with the 2-pole windings used for absolute position and the multipole windings for accurate position. Two-pole resolvers can usually reach angular accuracy up to about ±5 ′, whereas a multipole resolver can provide better accuracy, up to 10″ for 16-pole resolvers, to even 1″ for 128-pole resolvers.

7. Stepper motor - Wikipedia

   en.wikipedia.org/wiki/Stepper_motor

   Typically, given a phase, the center tap of each winding is made common: three leads per phase and six leads for a typical two phase motor. Often, these two phase commons are internally joined, so the motor has only five leads. The 28BYJ-48, accompanied by a ULN2003 driver, is one of the most popular stepper motors among hobbyists.