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Why are 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 are field loss detectors necessary in large dc motor?
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Why are the field loss detectors necessary in the large dc motors?
Field loss detectors are essential in large DC motors because they monitor the integrity of the field winding, ensuring that the motor operates safely and efficiently. If the field winding fails or experiences a loss of excitation, the motor can run at dangerously high speeds, leading to mechanical failure or damage. By detecting field loss promptly, these devices can trigger protective measures, such as shutting down the motor or reducing its load, thereby preventing accidents and extending the motor's lifespan. Overall, field loss detectors enhance the reliability and safety of large DC motor operations.
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.
Why is a permanent magnet necessary for an electric motor to function effectively?
A permanent magnet is necessary for an electric motor to function effectively because it creates a magnetic field that interacts with the electric current flowing through the motor's coils, causing the motor to generate rotational motion. This interaction between the magnetic field of the permanent magnet and the electric current is essential for the motor to convert electrical energy into mechanical energy efficiently.
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
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.
Why current is supplied to DC motor?
What supplies a dc motor is not current, but voltage. Current is what flows in the circuit formed by the dc motor and for the charge. That current varies according to the resistance of the circuit.
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..
what is the torque angle in synchronous motor?
The torque angle in a synchronous motor, also known as the power angle, is the angle between the rotor's magnetic field and the stator's magnetic field. It indicates the extent to which the rotor is lagging behind the stator field due to the load on the motor. As the load increases, the torque angle increases, which can lead to stability issues if it becomes too large. Maintaining an optimal torque angle is crucial for efficient operation and stability of the motor.
