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The poles can be varied at a ratio of 1:2 and thus the speed can be varied at 2:1. [7] [8] [9] Normally, the electrical configuration of windings is varied from a delta connection (Δ) to a double star connection (YY) configuration in order to change the speed of the motor for constant torque applications, such as the hoists in cranes.
A compensation winding in a DC shunt motor is a winding in the field pole face plate that carries armature current to reduce stator field distortion.Its purpose is to reduce brush arcing and erosion in DC motors that are operated with weak fields, variable heavy loads or reversing operation such as steel-mill motors.
Reactive filtration impedes the high frequency harmonic content but has little effect on the fundamental frequency that determines motor speed. The result is an output to the motor that is closer to an ideal sine wave. In the past, VFDs that have a capacity greater than 3 hp (2.2 kW) were costly, thus making the rotary phase converter (RPC) an ...
Bleach: Thousand-Year Blood War (BLEACH 千年血戦篇, Burīchi: Sennen Kessen-hen), also known as Bleach: The Blood Warfare, is a Japanese anime television series based on the Bleach manga series by Tite Kubo and a direct sequel to the Bleach anime series that ran from 2004 until 2012.
Cover of the 49th tankōbon volume, released in Japan by Shueisha on April 21, 2011. The chapters 424–686 of the Bleach manga series, written and illustrated by Tite Kubo, comprise two story arcs: the "Lost Agent arc" (死神代行消失篇, Shinigami Daikō Shōshitsu hen) and the "Thousand-Year Blood War arc" (千年血戦篇, Chitose Kessen Hen).
The rotating magnetic field is the key principle in the operation of induction machines.The induction motor consists of a stator and rotor.In the stator a group of fixed windings are so arranged that a two phase current, for example, produces a magnetic field which rotates at an angular velocity determined by the frequency of the alternating current.
A DC armature of a miniature motor (or generator) An example of a triple-T armature A partially-constructed DC armature, showing the (incomplete) windings In electrical engineering, the armature is the winding (or set of windings) of an electric machine which carries alternating current. [1]
By adjusting the shape of the bars in the rotor, the speed-torque characteristics of the motor can be changed, to minimize starting current or to maximize low-speed torque, for example. Squirrel-cage induction motors are very prevalent in industry, in sizes from below 1 kilowatt (1.3 hp) up to tens of megawatts (tens-of-thousand horsepower).