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Why field loss detectors necessary in large dc motor?
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What is difference between stab shunt dc motor and shunt dc motor?
A series motor respond by decreasing its speed with small increase in current for a given load torque. A shunt motor holds its speed nearly constant with large increase in input current for same amount of load torque
Why electromagnets over permanent magnets for a large dc machine?
The flux density of an electromagnet can be easily controlled. It's also easy and cheap to produce a large flux density with an electromagnet which is necessary for such large dc motors. Permanent magnets are generally expensive. For such a large motor,a very large permanent magnet will be needed for that motor which will not be ideal.AnswerElectromagnets are more powerful than temporary magnets, and -as pointed out above- their flux density can be controlled.
What field setting for a dc shunt motor wired in series on high voltage?
A shunt dc motor has quite different characteristics from a series motor. Wired in series, the same current passes through the armature and the field winding and it is most unlikely that a shunt motor would have a field winding that is suitable for this. Therefore a shunt motor cannot be wired as a series motor in general because its field winding is designed for only a small current.
How does a wiper motor work?
A wiper motor is a DC motor with two permanent magnets that serves as a field for the motor, arranged around the armature where the power is connected to the commentator of the armature with two brushes, the armature is a set of electro magnetic coils that is each connected to its own two segments in the commentator so that the power is connected to only one coil at a time to generate a magnetic field in the armature, this field will appose the field of the permanent magnet field, where the one field will push the other away and make the motor to turn.
Why field loss detectors necessary in large dc motor?
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What is field coils?
field coils generally refer to the electromagnetic coils on the stator ( the stationary part of an electric motor ). these generate the magnetic field(s) necessary to put the rotor ( the rotating part of the motor ) into motion.
What are magnetic shading coils and what do they do in a magnetic motor Starter?
Shading coils provide a phase shift between the magnetic field of the rotor and stator, which is necessary to get the motor spinning.
Is a starter is necessary for three phase induction motor?
A starter is unnecessary because the stator produces a rotating magnetic field.
What has the author Russell E Griffin written?
Russell E. Griffin has written: 'In-mine evaluation of underground fire and smoke detectors' -- subject(s): Equipment and supplies, Fire detectors, Mine safety 'Anticollision systems for large mine-haulage trucks' -- subject(s): Automatic location systems, Mine haulage, Motor vehicles, Proximity detectors, Safety measures
Why current is supplied to DC motor?
Current is supplied to a DC motor to create a magnetic field that interacts with the stationary magnetic field in the motor, resulting in a force that causes the motor to rotate. The current flowing through the motor's coils generates the electromagnetic force necessary for the motor to convert electrical energy into mechanical energy.
Where is a motor field magnet located?
The field of a motor is set up by the non-rotating part of the motor, and we call that the stator.
What does a field magnet do in a motor?
A field magnet in a motor generates a constant magnetic field that interacts with the magnetic field produced by the armature, causing it to rotate. This rotation creates mechanical energy that drives the motor. The field magnet helps establish the direction of the magnetic field within the motor, ensuring proper operation.
What is the effect of field current on dc motor?
The field current of a dc motor provides the magnetic field that allows the motor to develop a torque when current flows through the armature..
Why does the wire on an electric motor have to be coiled?
The wire in an electric motor is coiled to create a magnetic field when an electric current flows through it. This magnetic field interacts with other magnetic fields in the motor, causing the motor to rotate. Coiling the wire helps increase the strength of the magnetic field and improves the motor's efficiency.
Why is it necessary to keep the speed of a generator or motor to the rated value?
I'm not entirely positive, but increasing or changing the conserved rated speed of a generator or motor might generate high and intense heating, waste large amounts of power, and possibly will cease to produce the necessary torque to keep running.
What is the purpose of field coil in a electric motor?
The field coil in an electric motor creates a magnetic field when electricity flows through it. This magnetic field interacts with the armature, causing it to rotate and generate mechanical motion. The field coil determines the strength and direction of the magnetic field, influencing the motor's efficiency and performance.
