The different methods of speed control of DC shunt motor are, Armature control method Field control method Ward-Leonard method. Armature Control Method
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A four point starter is a protective device used in shunt and compound DC motors to limit the high starting current in the absence of back e.m.f. The construction of four point starter is similar to three point starter except the connection of NVC (No-volt coil).
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Speed-Torque Characteristics of DC Shunt Motor The speed-torque characteristics of DC shunt motor are also known as mechanical characteristics. They can be obtained from torque-current and speed-current characteristics of DC shunt motor.
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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
What are Interpoles in DC Machines? Theory, Connection Diagram & Uses Read More »
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
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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 »