How do you start DC shunt motor?
How do you start DC shunt motor?
The starter can be used for starting a d.c. series motor if it is fitted with a separately-excited no-volt coil. A 110-V d.c. shunt motor has an armature resistance of 0·3 Ω. Determine the armature current (a) when the back e.m.f. is 104 V, (b) at the instant when the armature is connected to a 110-V d.c. supply.
How can the starting current of a DC shunt motor be controlled?
Thus, the speed of a DC motor can be controlled in three ways: By varying the supply voltage. By varying the flux, and by varying the current through the field winding. By varying the armature voltage, and by varying the armature resistance.
Why do the starting current in DC shunt motor is high?
Answer: The starting current is high as there is no back EMF or counter EMF present in the armature circuit because atstarting counter EMF is zero. It’s armature has very less resistance due to this it need more current at starting time. Hence DC starters are used to limit the starting current ofmotor.
Is used to start a DC shunt motor?
A 4 point starter is used to start and control the speed of a Dc shunt motor with field weakening control.
What is the principle of DC shunt motor?
Construction and Working Principle The working principle of a DC Shunt Motor is, whenever a DC motor is turned ON, then DC flows throughout stator as well as the rotor. This current flow will generate two fields namely pole as well as the armature.
Why starting current of motor is high?
This high current in the rotor will create its own magnetic field which opposes the main stator magnetic field, this weakens the stator magnetic field so the back EMF in the stator will drop and the supply voltage will be much higher than the stator back EMF and so the supply current increases to a high value.
What is shunt and its principle?
A shunt motor (known as a shunt wound DC motor) is a type of DC motor which is self-excited and has the field windings that are connected in parallel to the armature winding of the motor. As these two parts are connected in parallel, the armature and field windings are exposed to the same supply voltage.
What are the parts of a DC motor?
A simple DC Motor is made of six basic components: axle, rotor, stator, commutator, brushes and field magnets. In the commercial DC motor, a high-strength magnetic field (exterior) is created by permanent magnets. The stator is the fixed part of the DC Motor.
What are the types of DC motors?
A simple DC motor is shown below. As mentioned earlier, any motor consists of two parts viz. stator and rotor. Based on the configuration and construction, there are three types of DC motors: brushed motor, brushless motor and servo motor.
What are the characteristics of a DC series motor?
DC Motor Characteristics Permanent Magnet Motors. The permanent magnet motor uses a magnet to supply field flux. Series Motors. In a series DC motor the field is connected in series with the armature.The field is wound with a few turns of large wire because it must Shunt Motors. Compound Motors.
What is a shunt motor?
What is a Shunt Motor Definition: It is a type of motor that is used for constant load applications. Its winding is basically arranged in parallel with the armature winding. The figure that depicts the shunt type of motor is shown below.
How do you start DC shunt motor? The starter can be used for starting a d.c. series motor if it is fitted with a separately-excited no-volt coil. A 110-V d.c. shunt motor has an armature resistance of 0·3 Ω. Determine the armature current (a) when the back e.m.f. is 104 V, (b) at the instant…