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Why is Dc shunt motor is not used to start at heavy load?
A DC shunt motor is not used to start under heavy load because it has a relatively low starting torque. At startup, the armature is stationary, leading to minimal back EMF and high armature current, which can cause excessive heating and potential damage to the windings. Additionally, the field current is constant, which does not provide the necessary torque boost needed for heavy loads. Consequently, other motor types, like series motors, are preferred for heavy load applications at startup.
Which type of motor is used for marble cutter?
dc shunt motor. it provides constant speed at all loads.
What is DC shunt motor?
A shunt DC motor connects the armature and field windings in parallel or shunt with a common D.C. power source. This type of motor has good speed regulation even as the load varies, but does not have the starting torque of a series DC motor
How are the series and shunt field windings of the compound wound dc motor connected relative to the armature?
series field in series with the armature shunt in parallel with the voltage supply the shut field increases the strength of the magnetic field with heavy loads to reverse the motors direction the fields remain the same you swap the armature leads
What happens to a shunt motor when the starting torque required is too high at start-up?
If the starting torque required is too high for a shunt motor, it could lead to stalling or jerky operation at startup. This can cause overheating and damage to the motor windings due to increased current draw. It is important to match the motor's torque capabilities with the load requirements to prevent these issues.
What is a DC shunt motor?
A DC shunt motor is a motor using DC supply with the the inductor connected parallel to the armature.
Why use maximum resistance for starting dc shunt motor?
because there is ahigh current flowing through it at the start...
Why can we start a shunt motor under no load but why can't a series motor?
The torque on a series motor is determined by the square of the armature current and, so, is very large -much larger than that of a shunt motor. Consequently, on starting, with no back-emf being generated, the torque on a series motor can be dangerously high if the machine has no mechanical load.
What are the internal and external characteristics of a DC shunt motor?
A DC shunt motor features internal characteristics such as a field winding connected in parallel (shunt) with the armature, which allows for a relatively constant speed under varying loads due to the constant field strength. Externally, it typically has a compact design, with terminals for armature and field connections, and is characterized by its ability to provide smooth speed control and high starting torque. Additionally, it usually has a simple commutation system, which is essential for efficient operation. These characteristics make it suitable for applications requiring stable speed and moderate starting torque.
Which DC motor is constant speed motor?
Dc shunt motor is constant speed motor.Its speed is constant with armature current.This shunt motor is used in paper mills and drilling machines
Precautions taking when starting a shunt motor?
When starting a shunt motor, it's essential to ensure that the motor is properly connected and that all safety measures are in place. Check that the power supply is stable and that the motor’s field winding is functioning correctly to prevent overheating. Gradually increase the voltage to avoid a sudden inrush of current, which could damage the motor or the power supply. Additionally, monitor the motor's temperature and current to ensure it operates within safe limits.
What happens if you short the shunt windings of a motor?
Answer:If the shunt winding is open the motor won't start, but if the shunt open while the motor is running, the motor will keep on running as if nothing went wrong, except if the wire of the winding get maniacally between the stator and the fields the motor can be damaged beyond repair. But normally the shunt windings is done with very thick conductors, so the chance that the shunt will go open is zero.
