Table of Contents
What is diverter What is the function of diverter in DC generator?
The parallel resistor is called a Diverter. A portion of the main current is diverted through a variable resistance Rd. Thus, the function of a diverter is to reduce the current flowing through the field winding. The reduction in field current reduces the amount of flux and as a result the speed of the motor increases.
How field control is used in series DC motor?
Field Controlled DC Motor. Voltage can be applied to the terminals of the DC motor or external resistance can be applied in the armature. Another method is to vary the flux per pole of the motor. The first two methods involve adjusting the motor’s armature while the latter method involves adjusting the motor field.
What would happen if a series resistance is inserted in the field circuit of a DC shunt motor at a constant supply voltage?
For a constant supply voltage, what are the effects of inserting a series resistance in the field circuit of a dc shunt motor, on its speed and torque? (a) Speed will decrease and the torque will decrease.
What is a diverter in a circuit?
A diverter is a circuit which is used to divert some of the armature current that will be normally in series-field coils. A diverter is used to the generators which are subjected to sudden heavy load swings, as the series-field coil is unable to over-come rapid changes in the load.
What is armature diverter?
Armature diverter: Diverter is connected across the armature as shown in fig (b). For a given constant load torque, if armature current is reduced then the flux must increase, as Ta ∝ ØIa.
What is diverter in generator?
6 Diverter: A diverter is a variable resistance shunting the series field of compound generator to adjust the degree of compounding to produce a desired voltage regulation. A diverter is used to control and produce a sufficient voltage rise at the generator to compensate for the voltage drop in the lines at full load.
What is an armature and field?
The armature is the winding to which the load is connected. In small generators, the field windings are often on the stator, and the armature windings are on the rotor. A synchronous motor is virtually identical to a synchronous generator. Thus, the armature is the stator and the field is the rotor.
What are the 3 ways of field control in DC series motor?
Thus, there are three general methods of speed control of D.C. Motors.
- Resistance variation in the armature circuit: This method is called armature resistance control or Rheostat control.
- Variation of field flux Ф This method is called field flux control.
- Variation of the applied voltage.
What would happen if a series resistance is inserted in the field?
If a resistance is added in series with field winding of d.c. shunt motor, then its speed increases, torque decreases.
Why is a surge diverter needed across the DC CB?
Installed in the switchboard, the surge diverter will help protect against most excess energy spikes. Any electricity over 260 volts will automatically be diverted to the ground. This then renders the excess power harmless and prevents a damaging surge in your home.