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Motor is running at its rated speed what wiil effects of armature?
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What are the disadvantages of armature speed control method for a dc motor?
In armature speed control, speed can be varied only below the rated speed. Also in it voltage drops will be high.
What is motor rated torque?
It is the twisting force that a motor can produce when it is running.
What is base speed?
The base speed of a DC motor is the speed at which it operates while delivering rated torque with rated armature voltage and field current applied.
Is four point starter is applicable to compound motor?
Yes! · To accelerate the motor to the rated speed · To limit the starting current in the armature to a safe value · To disconnect the motor in case of a supply failure or overload
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?
No can do until you can provide the current rating in Amperes.
In what condition does a motor gets burnt out when running at rated load?
If overload is not the cause, then high temperature could be caused by blocking the cooling of the motor.
The armature of 225kW 1200RPM motor has a diameter of 559mm and an axial length of 235mm. What is it moment of inertia knowing iron has a density of 7900kg per meter cube?
1.73, the square root of 3.Motors are rated in horsepower, not KW.
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. '
What does LRA mean in electrical terms?
Locked rotor amperage is the amperage the motor draws when the voltage is first applied to the motor and the rotor has not started to turn. This amperage is usually up to 300% of the motors running amperage. Once the rotor starts to turn the motor generates a back EMF (electro motive force) that opposes the high inrush current. This back EMF drives the amperage down until the motor gets up to its rated speed at which time the motor amperage will be at its run amperage.
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 solution for running three phase induction motor at voltage less than its rated voltage to drive full load?
The solution to this problem is to get the same size motor in HP at the correct voltage. This way the motor can correctly drive the connected full load without tripping the motor protection.
What happens at the rated value of the voltage of the generator?
The rated voltage of a generator decreases due to many causes such as armature reaction, overloading of the generator and AVR failure/ weak excitation voltage.
