0
The only explanation to that is given by the presence of back emf Eb, which plays a critical role in governing the operation of the motor. The back emf, develops as the motor armature starts to rotate in presence of the magnetic field, by generating action and counters the supply voltage. This also essentially means, that the back emf at the starting is zero, and develops gradually as the motor gathers speed.
The general motor emf equation E = Eb + Ia.Ra,
at starting is modified to E = Ia.Ra as at starting Eb = 0.
What else can I help you with?
How can Swinburne's test be adopted for series motor?
the method can not be used in the case of a d.c series motor
What device may be wired into the starting circuit of a motor to improve the starting torque?
I assume a 3 phase, AC induction motor. A star delta starter or a soft starter can be used. A soft starter is better compared to a star delta starter, but it is more expensive.
How can a relay be used to run a 9V electric motor?
A relay cannot be used to power a motor. It can be used to control the motor by wiring the motor circuit in series with the relay contacts.
Which type of motor is used in wet grinders?
A universal motor is used to operate a food mixer.
How much KW range can be use star-delta starter?
The use of a star delta starter is for motor control only and not resistive heating loads. This type of starter is used to dampen the inrush current by using a lower voltage to start the motor.
What is use of two point starter in electrical machines?
A two-point starter is used to control the starting of electrical machines, such as DC motors. It helps limit the initial current surge during the starting process by gradually increasing the voltage applied to the motor through the use of resistance. This protects the motor's windings and prevents damage due to high inrush current.
Why a DC motor starter is called 3 point starter?
Because it has three terminals L , F and A L - Line (connected to Supply) F - Field (connected to field of dc motor) A - Armature (connected to armature of DC motor) that's y it is called 3 point starter :)
Is 4 point starter used to start and control the speed of dc shunt motor with armature resistance control?
yes
Which motor is used for starting engine?
Er... a Starter Motor?
Can a starter used for 5 hp 3 phase motor be used for 7.5 hp 3 phase motor?
No, you cannot use a starter rated for a 5 hp motor with a 7.5 hp motor. The starter needs to be matched to the motor's horsepower rating to ensure proper protection and operation. Using an undersized starter can lead to overheating and premature failure of the motor. It is recommended to use a starter specifically designed for a 7.5 hp motor.
Can a voltmeter be used to measure voltage in and out of a starter motor?
Voltage flow into a starter motor, never out of it. Use the voltmeter to measure the voltage at the starter motor before starting to crank and then whilst it is cranking. (Before cranking, the voltage appears across the starter motor relay only.)
A motor starter will have a set of auxiliary contacts which is used to provide a?
Feedback to a control circuit that the motor starter has closed or opened its contacts as commanded.
Why use link in star contactor?
The link in the star contactor is used to form the star point of three of the motor leads. On most star wound motors the star point is inside the motor windings. On a motor that can be used for star delta starting it is a six wire motor. The star point winding depends on the contactor to tie the coil ends together externally in the control panel of the star delta starter.
What DC motor is used for traction?
dc series motor is used for traction...
Where on a motor vehicle would brass be used?
Brass bushings inside the electric starter motor.
How can Swinburne's test be adopted for series motor?
the method can not be used in the case of a d.c series motor
How can swinburn's test be adopted for series motor?
the method can not be used in the case of a d.c series motor
