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A Field Loss Relay protects the motor or connected machinery from damage that could be caused by a sudden loss of power to the motor field. In a DC motor, reducing the field current causes an increase in rotor speed (Field Weakening control utilises this to run motors above their base speed). However, if the field current suddenly drops off, the armature will try to accellerate to infinite speed. Sometimes this will just blow the fuses on the drive, but I have witnessed a DC motor self-destruct because of field loss - the armature accellerated to such a speed that the centrefugal force ripped apart the rotor. The motor was only good for a boat anchor afterwards.
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What else can I help you with?
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 :)
What are the two main types of starter motor?
I think one is conventional starter motors and the other is Gear-reduction starter motor.
How do you start a DC motor if there is no 3 point starter?
By the use of auto transformer and bridge rectifier we can start dc motor.
What is the combination starter?
A combination starter usually applies to Motors.It is a Motor Starter that has some sort of motor protection within its circuitry, i.e. fuses, or circuit breakers.They typically contain Fuses, or Circuit Breakers, contactors, motor protection (in the form of Overload Heater-similar to circuit breakers, but may specifically for devices that draw a lot of current for a brief period).Combo starters may also feature Forward or reverse starting configurations, and push buttons for On/Off Control.Combo starters can be contained in a single enclosure, and combo starters can usually be found within MCCs (Motor Control Centers).
How do you work Dol starter?
A DOL or direct on line starter works by connecting the motor terminals directly to the power supply when they are energized. A DOL starter is the simplest type of motor starter.
What are magnetic shading coils and what do they do in a magnetic motor Starter?
Shading coils provide a phase shift between the magnetic field of the rotor and stator, which is necessary to get the motor spinning.
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 :)
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.
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.
Why motor protection circuit breaker is not used in star delta starter?
please you give me reply to answer.
Is a starter is necessary for three phase induction motor?
A starter is unnecessary because the stator produces a rotating magnetic field.
How do you remove the starter on 1994 Mazda RX7?
here are the steps to remove your starterDisarm radio coded theft protection as outlined in Technician Safety Information .Disconnect battery ground cable.Raise and support vehicle.Disconnect starter motor electrical connectors.Remove starter motor bolts and starter motor from vehicle.Reverse procedure to install, noting the following:Torque starter motor attaching bolts to 28 - 38 ft.lb.
Why 3 point 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 :)
What does an eletromagnet do in a motor?
Provide amoving magnetic force field.
What is the necessity of the starter.Can a single pole switch replace it?
A motor starter usually has an overload heater incorporated into it. A single pole switch does not have that type of protection. There are many brands of fractional motor starter switches. These types of switches are sized by the motors full load amperage. These types are dual purpose being that they can be used as the motors isolation switch and also they can be used as motor protection for the connected motor.
What is the use of 4-point starter in motors?
The four-point starter eliminates the drawback of the three-point starter. In addition to the same three points that were in use with the three-point starter, the other side of the line, L1, is the fourth point brought to the starter when the arm is moved from the "Off" position. The coil of the holding magnet is connected across the line. The holding magnet and starting resistors function identical as in the three-point starter. * The possibility of accidentally opening the field circuit is quite remote. The four-point starter provides the no-voltage protection to the motor. If the power fails, the motor is disconnected from the line.
FCMA starter principle and working during starting induction motor?
The FCMA (Field Control Motor Arrangement) starter principle involves controlling the field current to manage the starting torque and speed of an induction motor. During startup, the motor is initially supplied with reduced voltage to limit the inrush current, and the field current is adjusted to ensure smooth acceleration. As the motor approaches its rated speed, the field current is gradually increased to optimize performance. This method enhances efficiency and prolongs the motor's lifespan by preventing mechanical and electrical stress during startup.
