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2. Three-phase electric power - Wikipedia

   en.wikipedia.org/wiki/Three-phase_electric_power

   An important class of three-phase load is the electric motor. A three-phase induction motor has a simple design, inherently high starting torque and high efficiency. Such motors are applied in industry for many applications. A three-phase motor is more compact and less costly than a single-phase motor of the same voltage class and rating, and ...

3. Polarity (mutual inductance) - Wikipedia

   en.wikipedia.org/wiki/Polarity_(mutual_inductance)

   Three-phase transformers used in electric power systems will have a nameplate that indicate the phase relationships between their terminals. This may be in the form of a phasor diagram, or using an alpha-numeric code to show the type of internal connection (wye or delta) for each winding. [citation needed]

4. Growler (electrical device) - Wikipedia

   en.wikipedia.org/wiki/Growler_(electrical_device)

   A growler is an electrical device primarily used for testing a motor for shorted coils. A growler consists of a coil of wire wrapped around an iron core and connected to a source of alternating current. When placed on the armature or stator core of a motor the growler acts as the primary of a transformer and the armature coils act as the ...

5. Coil winding technology - Wikipedia

   en.wikipedia.org/wiki/Coil_winding_technology

   Since the winding may block slots from further insertion of wire, it may be necessary to wind a complete phase winding at one time. Comparison of concentrated and distributed windings. Coil insertion machines insert prefabricated groups of coils into the stators of electric motors.

6. Blocked rotor test - Wikipedia

   en.wikipedia.org/wiki/Blocked_rotor_test

   It is also known as short-circuit test (because it is the mechanical analogy of a transformer short-circuit test), [1] locked rotor test or stalled torque test. [2] From this test, short-circuit current at normal voltage , power factor on short circuit, total leakage reactance , and starting torque of the motor can be found.

7. 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.

8. Linear induction motor - Wikipedia

   en.wikipedia.org/wiki/Linear_induction_motor

   The history of linear electric motors can be traced back at least as far as the 1840s to the work of Charles Wheatstone at King's College in London, [3] but Wheatstone's model was too inefficient to be practical. A feasible linear induction motor is described in US patent 782312 (1905; inventor Alfred Zehden of Frankfurt-am-Main), and is for ...

9. Dahlander pole changing motor - Wikipedia

   en.wikipedia.org/wiki/Dahlander_pole_changing_motor

   Some smaller induction motors are connected so that all the poles are identical, causing the motor to act as though there is an equal number of opposite poles in between. A Dahlander motor achieves different speeds by switching the configuration of the electrical windings, indirectly adding or removing poles and thus varying the rotor speed.