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Sabryna Dooley
Nguyen Emily
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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
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.
Is it necessary to have three phase rotor windings for the transmitter and motor in selsyn motor?
is it necessary to have three phase rotor
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 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 size motor needed for a 22 ft sailboat?
NO motor is necessary on a sailboat.
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
What happens if field winding of a running dc shunt motor suddenly breaks open?
when the field winding of a running dc shunt motor suddenly breaks open the motor fails to run because in the motor the stationary winding is armature and rotatory is field winding
