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A starter or contactor is used for a couple of reasons. It allows the motor to be stopped and started from remote locations. Incorporated into the contactor is usually an overload device to protect the motor from overloading. Also a contactor is used for under voltage protection. If the power goes off when the motor is running the contactor has to be restarted manually again when the power comes on again. This is two fold protection in case someone is working on the equipment when the power is off and forgets to lock the device out and it restarts automatically. The other part of this equation is that you don't want all of the motor loads starting at once on power return. On big factories this could cause a voltage drop all the way down the power authority's line. They don't look favourably on things like that.
Wiki User
∙ 15y ago
Wiki User
∙ 12y agoThe DC motor initially before starting doesn't have a back EMF generated in the armature (which is the rotor) since the motor is stand still. Due to the absence of back emf, when the full voltage is applied to stator winding during starting ther will be heavy inrush of stator current which may damage the windings of the stator.Hence a DC starter which is basically a series of resistance is introduced in the stator winding to reduce the line current . Once the rotor starts rotating the armature generates back EMF, then gradually the resistance in the starter is cut off.
Wiki User
∙ 8y agoIf the starting current is too high it is common to switch in a series resistor to limit the current. This is most common with a series-wound motor. At normal speed the resistor can be switched out.
Wiki User
∙ 14y agoBecause if you do not have starters in a motor because it won't work properly if it doesn't have them.
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Do 1 phase electric motors need starters?
it depends on the load and size of the motor if the motor has to drive heavy loads from initial state it require more torque, for this we use star-delta starters where load on motor in permissible then we use a DOL starters DOL starters are direct supply feeders to the motor so there is no rule to use a starter. we can use anything to swith the motor. for protection we need a overload relay and you ask for a 1ph motor, i.e maximum 3hp motors are available for less than 2 hp motor you can use a 6amp switch used in household or a 6amp mcb (includes overload). for 3hp a 16 amp switch or a 10amp mcb is more than enough
What is the function of an electric motor in terms of electric power and motor?
The electric motor changes electric energy into mechanical energy.
What is the voltage tolerance of a standard electric motor?
the voltage tolerance of a standard electric motor is
What is the output of an electric motor?
An electric motor converts electrical energy to kinetic energy.
What is the circuit for reversing an electric motor?
I HAVE A SMALL ELECTRIC CLOCK MOTOR THAT I NEED TO REVERSE. WHAT IS THE CIRCUIT I NEED TO REVERSE IT?
Electric motor parts?
Electric motor parts are pieces of electric motors. Some examples of electric motor parts are: bearings, carbon brushes, gasket materials, pumps, soft starters, and terminal boxes.
How do you crank the engine on a motor boat?
There are many different ways. On an outboard motor it can be a rope, pulley or an electric motor. Inboard engines are usually bigger and have electric, pnuematic or hydraulic starters. They can also be turned over with a hand crank if not too large.
Why would you use 2 point starters instead of 3 point starters for a motor?
traditionally, 3 contact starters are for a three phase motor and two contact starters are for a single phase motor.
How do you repair starters on ATVs?
remove and take to a local electric motor shop they can rebuild most of them for a lot less than purchasing
Do 1 phase electric motors need starters?
it depends on the load and size of the motor if the motor has to drive heavy loads from initial state it require more torque, for this we use star-delta starters where load on motor in permissible then we use a DOL starters DOL starters are direct supply feeders to the motor so there is no rule to use a starter. we can use anything to swith the motor. for protection we need a overload relay and you ask for a 1ph motor, i.e maximum 3hp motors are available for less than 2 hp motor you can use a 6amp switch used in household or a 6amp mcb (includes overload). for 3hp a 16 amp switch or a 10amp mcb is more than enough
What types of dc motor starters?
3 point & 4 point starters are used
What is the function of an electric motor in terms of electric power and motor?
The electric motor changes electric energy into mechanical energy.
What changes electric energy into motion?
An electric motor
Which conversion does an electric motor make?
electric energy to mechanical energy
What is your favorite starter Pokemon?
i think piplup cause there no electric starters.
Why it is that mechanical energy is the output of an electric motor?
Because that is the purpose on an electric motor.
What is a machine that turns mechanical energy into electrical energy?
Electric motor.
