How do you determine the direction of a DC motor?
To check the direction of rotation of this armature, you should use the right-hand rule for motors. Hold your thumb, forefinger, and middle finger at right angles. Point your forefinger in the direction of field flux; in this case, from left to right.
Which of the following rule is used to determine the direction of rotation of DC motor Examveda?
Fleming’s right hand rule is used to find the direction of the.
Which of the following rule is used to determine direction?
Whenever a current carrying conductor is placed in a magnetic field, it experiences a force due to the magnetic field. The direction of force acting on the conductor can be found using Fleming’s Left Hand Rule.
How do you determine the polarity of a DC motor?
1 Answer. DC motors can usually run with either polarity but direction of rotation will be reversed. Read the data sheet or the label on the motor if you need to be sure it will turn the right direction on start. The armature draws more current than the field so needs a heavier wire.
What are the application of DC series motor?
In portable applications using battery power, DC motors are a natural choice. DC machines are also used in applications where high starting torque and accurate speed control over a wide range are important. Major applications for DC motors are: elevators, steel mills, rolling mills, locomotives, and excavators.
Which rule is used in DC motor?
In a simplified way, Fleming’s left-hand rule can describe motion in any of the multitude of different types of electric motors. DC, AC, Brushed, Brushless, Induction – all of these use the same concepts (1 electromagnetic field, 1 field that is either magnetic or electromagnetic, 1 force generated) to generate motion.
What is the efficiency of a DC motor?
The value of the efficiency of a DC motor could typically be in the range of 70 to 85%. Larger the machine higher will be the efficiency. Losses consist of Armature and field copper losses, core loss, friction and windage loss.
What is the speed of DC motor?
DC controls adjust speed by varying the voltage sent to the motor (this differs from AC motor controls which adjust the line frequency to the motor). Typical no load or synchronous speeds for an AC fractional horsepower motor are 1800 or 3600 rpm, and 1000-5000 rpm for DC fractional hp motors.
What gives the direction of induced current?
This rule states that if the thumb, index finger and middle finger of the right hand are outstretched in a mutually perpendicular fashion such that the thumb points towards the direction of the relative motion of the conductor and the index finger points towards the magnetic field, then the direction of the induced …
Which rule is used to determine the direction of the magnetic field?
The right hand rule states that, to find the direction of the magnetic force on a positive moving charge, the thumb of the right hand point in the direction of v, the fingers in the direction of B, and the force (F) is directed perpendicular to the right hand palm.
Which rule is used to determine the direction of the magnetic field in this case?
The Maxwell right-hand thumb rule indicates the direction of the magnetic field in the direction of the current. If the thumb of the right-hand points along the direction of the current, then the remaining curled fingers of the same hand give the magnetic field direction due to the current.