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What is separately excited DC motor?
The main difference between the Separately excited motor and the shunt motor is the field cct where as in the second it has its own voltage supply.AnswerI think you mean 'generator', not 'motor'. A 'self-excited' motor is one in which the output supplies the field current, as well as the load current. A 'separately-excited' motor is one in which the field current is provided from an external source.
What is over load relay?
to be protect the motor and electrical equipments.some circuit provide to protect the motor.for exm.DOL starter, OLR to protect the motors....
What is the reason for putting a voltage rating on resistors?
Due to the physical construction and size of the resistor, at a certain voltage, the insulation will break down and the applied voltage will arc over. This is generally bad. Operating the resistor within its voltage rating will prevent this failure mode.
What is the effect of armature over voltage in a dc motor?
Overvoltage on DC motor armature can be detrimental to the life of the windings. Most modern drives have voltage feedback and detect this condition. A likely cause is loss of speed feedback, voltage feedback or the load driving the motor beyond what the drive can handle. Fixes for the above: -check and mend the feedback circuits and associated hardware (cable, tachos, input cards, processor cards) -change from a single quadrant to a four quadrant drive -install a braking resistor -inspect the mechanical system to ensure there are no wild split points in the gearing
Triac break over voltage?
A: TRIAC will break over and conduct at a certain if a certain voltage is reached. That voltage depends on all different triacs devices
What is separately excited DC motor?
The main difference between the Separately excited motor and the shunt motor is the field cct where as in the second it has its own voltage supply.AnswerI think you mean 'generator', not 'motor'. A 'self-excited' motor is one in which the output supplies the field current, as well as the load current. A 'separately-excited' motor is one in which the field current is provided from an external source.
What is over load relay?
to be protect the motor and electrical equipments.some circuit provide to protect the motor.for exm.DOL starter, OLR to protect the motors....
What purpose does a capacitor serve in a single phase motor?
These are actually single-phase induction motors. There is no electrical connection to the armature itself. To make the armature turn within the windings an electric current has to be induced in the it, and this is done by making the magnetic field move in relation to the armature. (The same principle is involved as moving a magnet over a wire to get an electric current.) With an electric current flowing in the armature there is a magnetic field set up around it which pushes against the magnetic field in the windings to make the armature turn.OK, but how to make the magnetic field move? That's the purpose of the capacitor.Capacitors have the property of advancing alternating current by (if I remember correctly) 90 degrees. In the simplest case, there are two windings in one of these motors. Unaltered electric current is sent through one of the windings. Some electric current is sent through the other winding and a capacitor. Now, because the two windings are being energised by currents that are out of phase by 90 degrees it is as if the magnetic field is moving. The armature responds by moving.
Could over-current be caused by low voltage?
No, not directly. The supply voltage has to rise or the resistance has to fall to get over-current. If there was a secondary control voltage that was part of a voltage control circuit for a higher voltage, it is conceivable that a voltage drop in control circuit could cause an over-voltage in the supply. Motors are constant power devices, so this could be true for a motor. If you have a 1hp motor (loaded at 1hp), it will want to draw 1hp of power no matter the supply voltage. If the voltage dips, the motor will require more current to keep it spinning at it's normal speed.
What is the reason for putting a voltage rating on resistors?
Due to the physical construction and size of the resistor, at a certain voltage, the insulation will break down and the applied voltage will arc over. This is generally bad. Operating the resistor within its voltage rating will prevent this failure mode.
Give the 5 reasons for the preference of revolving field alternators over the revolving armature type of machine?
Give the 5 reasons for the preference of revolving field alternators over the revolving armature type of machine?
why starter motor armature over heat?
Usually caused by worn bearings.
What is the effect of armature over voltage in a dc motor?
Overvoltage on DC motor armature can be detrimental to the life of the windings. Most modern drives have voltage feedback and detect this condition. A likely cause is loss of speed feedback, voltage feedback or the load driving the motor beyond what the drive can handle. Fixes for the above: -check and mend the feedback circuits and associated hardware (cable, tachos, input cards, processor cards) -change from a single quadrant to a four quadrant drive -install a braking resistor -inspect the mechanical system to ensure there are no wild split points in the gearing
What is medium and high voltage?
Medium voltage is over 1000 v, high voltage is over 45 kV.
Who took over general motors?
No one. General Motors Owns Buick, Chevrolet, and Cadilliac.
What are General Motors demographics?
General Motors (GM) produces and sells vehicles all over the world.
What happens to the armature and the hammer when the electric bell is switched on?
When power is applied to the armature coil, the armature which has the hammer attached to it is drawn into the coil. The bell is struck by the hammer. At the end of the hammer stroke there is a N.C. (normally closed) contact which is opened. The opening of the contacts stops the current flow to the armature coil and the armature and hammer return to the off bell position. In the off bell position the N.C. contact re closes and the cycle is repeated over again. This cycling will continue until the bell circuit is turned off.
