0
You have a DC motor with no name plate details you are only aware of the Armature voltage and Field voltage the rpm of the motor is 1800 you need to find the rated kw of the motor With above details o?
Wiki User
∙ 14y ago
No can do until you can provide the current rating in Amperes.
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
What is the magnetization characteristic of the DC machine?
magnetisation characteristic of dc generator is nothing but the open circuit characteristic of dc generator where we determine the operating characteristics of dc machines.it is used to determine the open circuit armature voltage keeping armature current zero,at rated speed and after few laps of time filed current is gonig to be raised from zero.where the armature open circuit voltage is reached above its rated value. '
How do you explain the magnetic effect of an alternator?
How alternators workAn alternator is an a.c. motor in reverse; the coils of the armature (the part that rotates) cuts through the magnetic field of the stator (the part that is stationary, which is what "stator" means). A current is produced whenever a wire cuts through a magnetic field; the amount of current depends upon the strength of the field and the speed of the wire. This current is coupled out of the armature by two copper rings and a pair of brushes. For automobiles, the a.c. (alternating) current is converted to d.c. (direct current) by rectifiers (also called diodes). ERROR: A voltage is applied to the rotor winding by way of the slip rings. This creates an electro magnet who's field cuts across the stator windings. The stator winding voltage is an alternating current that is retified and regulated and is outputed out at the terminal on the back of the alternator. This is exactly the reverse of the above. If the above were true the brushes would smoke when a high current passed through them
What are v and inverted v curves?
V Curve- Excitation vs Armature currentV curve is the graph showing the relation of armature current as a function of field current in synchronous machines. The purpose of the curve is to show the variation in the magnitude of the armature current as the excitation voltage of the machine is varied.Inverted V Curve- Excitation vs Power FactorThe synchronous motor "V Curves" shown above illustrate the effect of excitation (field amps) on the armature (stator) amps and on system power factor. There are separate "V" Curves for No-Load and Full-Load and sometimes the motor manufacturer publishes curves for 25%, 50%, and 75% load. Note that the Armature Amperage and Power Factor "V" Curves are actually inverted "V's".Assume it is desired to determine the field excitation which will produce unity power factor operation at full motor load. Project across from the unity power factor (100%) operating point on the Y-Axis to the peak of the inverted Power Factor "V" Curve (blue line). From this intersection, project down (red line) from the full-load unity power factor (100%) operating point to determine the required field current on the X-Axis.In this example the required DC field current is shown to be just over 10 amps. Note at unity power factor operation the armature (stator) full-load amps is at the minimum value.Increasing the field amps above the value required for unity power factor operation will cause the machine to run with a leading power factor, while field weakening caused the motor power factor to become lagging. When the motor runs either leading or lagging, the armature (stator) amps increases above the unity power factor value.
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
Why you provide automatic voltage regulator in the DG set?
The VAR seance the EXCITER volts and them send a rated voltage that wright down on your alternator like as EXT V. 38 To Field coil to cut the field magnets. This Voltage are 180 to 250 or above V. AC. , The exciter V. are 09 to 24 V. DC.AnswerThe AVR is responsible for keeping the terminal voltage of the generator approximately constant for variations in load.
How does capacitor discharge while ac supply is on?
For part of the AC voltage wave, the capacitor will be above the source voltage, and will discharge until the AC voltage wave increases above the capacitor's stored voltage.
What is the meaning of E in electric generators?
E is normally back emf ,v is supply voltage as per machine theory ......for generator E>v for motors V>E ......................................back emf will be in armature of machine.....................................................AnswerUnfortunately, if you are referring to the symbol for voltage, then there is no standard. The above answer is correct for some texts but, often, 'E' represents 'electromotive force', which is the open-circuit potential difference of the generator.
What is lower threshold voltage?
the voltage above which any device starts conducting
How much voltage a 0v bulb need to glow?
Some small voltage above 0.
At what value of voltage you get shock?
above 28 volts..
What does positive 20mv mean?
Probably 20 millivolts above zero voltage. A really weak voltage.
How Zener diode can be used as a reference voltage source?
Zener diodes only allow reverse-biased currents of above a certain (breakdown) voltage. You can use it to test if a current has a voltage above or below a specific number of volts.
