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Series motors have the highest starting torque. The torque is proportional to the square of the current, and the starting current is so high it has to be limited by a resistor called a rheostat.
Series motos are used mainly on trams and trolley buses.
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Why you use DOL starter in starting of motor?
because of starting current of induction motor is very high and it damages the insulation of motor
What type of motor is used in centrifugal pump?
3 Phase induction motor because it produce high torque at starting
Why it is dangerous to supply power to an unloaded series connected DC motor?
Starting torque becomes very high due to which motor can attain very high speed and can damage its body and connected equipments.
What is the major advantage of a compound DC generator?
The compound DC motor has the advantage of both, constant speed feature of the shunt motor and the capability to handle high starting torque feature of series motor.
Why the armature rheostat of dc is motor kept at maximum resistance position?
It isn't. It is only kept at maximum resistance when the motor is not running. That is done to limit the starting current.
Why you use DOL starter in starting of motor?
because of starting current of induction motor is very high and it damages the insulation of motor
Why is the starting current high in DC motor?
The starting current is high because when the motor is not rotating no back-emf is generated, leaving the starting current to be determined by the armature resistance, which should be low.
Which of the following Dc motor is suitable for high starting torque?
capacitor start motor
What will be the starting current of a 335hp Sqcage motor on no load?
Across the line starting of a motor can be as high as 300% of the full load amps.
Why ac motors are not used in railways?
Ac motor has a low starting torque so that DC series motor used in railways cause DC motor has high starting torque
What are the advantages of induction motor?
1. Induction motor has high starting torque, therefore use for operate pump which need high starting torque. 2. Induction motor operate on variable speed. 3. It can be used as generator when speed of motor is higher than synchronous speed.
What type of motor is used in centrifugal pump?
3 Phase induction motor because it produce high torque at starting
Why the series motor is started with some initial load?
In dc motors Speed is directly proportional to back emf and inversely proportional to flux i.e N∝(Eb/φ) In series motor back emf is practically constant. So if we start motor without any load Flux will be small and so speed will be very high. if we start motor without any load it will gain very high speed and may get damaged due to centrifugal forces. Series motor have very high starting torque and used where high starting torque is required.
What are components of a DC motor starter that can be affected by a high starting current if it is not limited?
armature
What is the use of double cage rotor in induction motor?
to obtain high starting torque
What causes the lights in your house to be turned on by turning on the washer machine?
Because at the start and stop of motor it will take high current on starting of motor.
Why dc series motor are use in train?
due to high starting torque and droping charactristics
