Torque Production in DC Motor Consider a DC motor with stator and rotor. When the stator coils are energized, a stator magnetic flux is set up and follows the path as shown in figure (a) with no current in the rotor conductor.
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Figure 1: Interpoles. Interpoles are small poles placed in between the main poles of a D.C generator as shown in figure (1). Interpoles are also known as commutating poles or com poles. In generators, the polarity of the inter pole is same as the main pole which is ahead of it in the direction of
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Figure 1: Compensating Winding. Compensating winding is an extra winding placed in the slots of pole shoes of field winding as shown in figure 1. The armature and compensating winding both are connected in series. In any pole shoe the direction of current in compensating winding is opposite to the direction of current flow through
What is Compensating Winding in DC Machines? Theory, Connection Diagram & Uses Read More »
No-load Test No-load Test is conducted on the 3-phase induction motor to determine no-load current I0, no-load power factor windage and friction losses, no-load copper loss (I02R), no-load power input P0, no-load resistance R0 and magnetizing reactance X0 etc.
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The armature windings are the conductor coils placed in the slots of armature core mounted on the shaft of the rotor of a D.C machine. As the e.m.f induced for one turn is very small, each coil of the winding consists of many turns to get the required e.m.f.
Figure 1: Torque-speed characteristics of an induction motor.
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Figure 1: Torque-slip characteristics of an induction motor.
Torque Slip Characteristics of Induction Motor Read More »
A three phase induction motor is an AC motor consisting of a three-phase winding and are used for applications like exhaust fans, lathes, etc.
When the slip of induction motor is negative i.e. , when the induction motor runs at a speed greater than synchronous speed, the induction motor runs as a generator called induction generator. Working of Induction Generator When a 3-ϕ induction motor is given A.C supply and is mechanically coupled to a prime mover then it
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A double cage rotor induction motor gives excellent starting and running characteristics than a deep-bar cage rotor induction motor. It also provides a high starting torque with a low starting current. Therefore it is also known as low-starting current, high starting torque, low slip-motor. The rotor is well designed in order to have high resistance
What is Double Cage Induction Motor? Working, Construction, Diagram & Characteristics Read More »