WHAT ARE THE PRINCIPLES OF HOW THE STARTER MOTOR WORKS?

When you turn the ignition switch, power goes to the starter solenoid. The starter solenoid closes and sends power to the starter motor. The starter motor is just that a motor. When it receives the power from starter solenoid it starts to turn very fast. On the other end of the motor shaft is a gear.

1. why does headlights dim when a starter motor is turned on

A DC motor uses current to produce torque using essentially the moment of the Lorentz force $q mathbfvwedge mathbfB$ on the conductors. When it is stationary, there is almost no resistance: if driven by a source with low source resistance, there is theoretically infinite current (in practice very big: IIRC a car's starter motor draws in the neighbourhood of 500A) and huge torques as a result. The current only decreases as the motor's rotational speed increases: the conductors moving through magnetic fields produce back voltages in accordance with Faraday's law: thus the incoming current does work against the opposing voltage as the motor's output torque $tau$ does work at a rate of $tau omega$, where $omega$ is the rotation speed (the works of course are equal). Indeed if you work out the relevant equations grounded on Faraday's law and plot torque of a series-connected DC motor (stator and rotor windings in series) you get $tau propto I propto omega^-1$, where $I$ is the current flowing. This torque inversely proportional to speed is ideal for "getting things going", which is why DC motors are so useful for lugging trains with. Or for starting cars with: the compression in an internal combustion engine means that you need big torques for starting, thus the need for huge currents. The upshot of all this is that when you start the car, you are dropping an almost dead short circuit across the battery - at least for a fleeting moment before the rotor begins to spin. This is what you want: it yields the immense current you need to start the car with. But it also means that, for a short moment, the potential difference across the motor is almost nought. This means that everything else switched on is almost shorted out as the near-zero resistance motor draws almost all the current.The potential difference across the battery output equals that through the whole circuit it supplies. Any potential drops below the battery's open circuit potential difference are owing to source resistance. Look up Thvenin equivalent circuits and source impedance. Car batteries are designed to have very low source impedance - a tiny fraction of an ohm - because this is what limits the all important current to the starter motor. Edit to be read together with Olin's answer: The following expands on Olin's answer below to show in pictures what he has done - I am only doing this now because he has put me to shame by showing what I should have done for you in the first place: Below is a circuit diagram (taken from the Wiki page for source impedance) of your battery with the total "load" $Z_L$ (it is made up of everything in the car switched on wired in parallel with the starter motor) and the battery, which here is comprises its Thvenin equivalent of an "ideal" electrochemical cell $V_S$ (an infinitely big one so that electrolysis products negligibly hinder current flow) together with an in-series source resistance $Z_S$. If you do the calculation Olin suggests, the voltage you measure at the battery terminals is $V_L$, i.e. the 12V less the current times the source resistance. I did not quite understand at first your 10V - my gut feel was that it should be lower - but Olin's calculation makes it quite realistic, although I thought that many starter motors draw more than 100A.

2. If the battery of a car is completely drained so that the starter motor cannot work, how do you start the car now without charging the battery?

In my part of the world, manual transmissions are ubiquitous. I have had several cars including mine get to the point where a self start is not possible. The battery has drained so much that it cant crank the engine over with the starter. However, its very important to understand that, when at this point, the battery can still fire the ignition. The test for this is to first turn the key to start ignition and have ll the icons on the dash come ON. So battery doesnt have the juice to crank but has the power to fire the spark. In this state, push the car in gear with the clutch depressed untill there is sufficient momentum such that when the clutch is released, the momentum of the car cranks the engine over and the battery fires the charge. Once the car starts, it will top out the battery within a few km. Its also important to note that this is easier done in reverse than in 1st gear because reverse gear has the lowest speed and hence the highest torque. This does assume that your battery has the juice to spark. In my car, after an alternator failure, the battery didnt have the juice and they had to get another battery to drive the car to service.Of course, this isint possible in auto boxesIf the battery of a car is completely drained so that the starter motor cannot work, how do you start the car now without charging the battery?.

3. WHAT IS THE STARTER CORE ON A STARTER MOTOR FOR A VEHICLE??

Autozone wants your old starter so that they can rebuild it and resell it. The core charge is their way of getting it. If you pull your old starter off and bring it in when you buy the new one, they will only charge you $119.99. Otherwise, they will charge you $161.99, and then give you a $42 refund when you bring the old one back in.

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Is This Bad Starter Motor?
Sounds more like a connection problem or bad battery. Even if the starter was bad and the connections and battery were in good shape the voltage would not drop below 8 volts. Check for poor connection at the battery (both the positive and negative cables) The battery when charged up should show a static charge of 12.7 volts Hope this helps1. how does an induction motor work?The simplest of all electric motors is the squirrel-cage type of induction motor used with a three-phase supply. The armature of the squirrel-cage motor consists of three fixed coils similar to the armature of the synchronous motor. The rotating member consists of a core in which are imbedded a series of heavy conductors arranged in a circle around the shaft and parallel to it. With the core removed, the rotor conductors resemble in form the cylindrical cages once used to exercise pet squirrels. The three-phase current flowing in the stationary armature windings generates a rotating magnetic field, and this field induces a current in the conductors of the cage. The magnetic reaction between the rotating field and the current-carrying conductors of the rotor makes the rotor turn. If the rotor is revolving at exactly the same speed as the magnetic field, no currents will be induced in it, and hence the rotor should not turn at a synchronous speed. In operation the speeds of rotation of the rotor and the field differ by about 2 to 5 percent. This speed difference is known as slip. Motors with squirrel-cage rotors can be used on single-phase alternating current by means of various arrangements of inductance and capacitance that alter the characteristics of the single-phase voltage and make it resemble a two-phase voltage. Such motors are called split-phase motors or condenser motors (or capacitor motors), depending on the arrangement used. Single-phase squirrel-cage motors do not have a large starting torque, and for applications where such torque is required, repulsion-induction motors are used. A repulsion-induction motor may be of the split-phase or condenser type, but has a manual or automatic switch that allows current to flow between brushes on the commutator when the motor is starting, and short-circuits all commutator segments after the motor reaches a critical speed. Repulsion-induction motors are so named because their starting torque depends on the repulsion between the rotor and the stator, and their torque while running depends on induction. Series-wound motors with commutators, which will operate on direct or alternating current, are called universal motors. They are usually made only in small sizes and are commonly used in household appliances.2. is it bad to have a car with a lot of miles but new motor?well you got the tranny. that can go at any time. but if it is good then you will only have the odds and ends3. How does an AC motor work?Basically, an AC motor is a type of motor that is operated by an alternating current. It has two basic parts. First is a stationary stator and another is rotor.The above diagram shows the configuration of stator winding. I am giving an example for 3 phase motor. Hence, in above diagram A, B and C are the three phases. When the current is supplied to the windings, all the three windings become electromagnets. When the current reverses polarity of the winding also reverses.The stator windings are 120 degrees apart. Now, when the supply is given to the windings, only 2 phases of the supply are active and the remaining one phase is non-active or has no current flowing through it. Hence, the one phase which has no current flowing through it will have no magnetic field.Let us assume that at the start phase A has no current and no magnetic field produced. Phase B has current in negative direction and phase C has current in positive direction. Now, at some time 1, phase A has current in positive direction and phase B has in negative direction. While phase C has no current and no magnetic field. The resultant magnetic field vector has rotated 60 in the clockwise direction. Now at some time 2, phase A has current in positive direction and phase C has in negative direction while phase B has no current and magnetic field. The resultant magnetic field vector has rotated another 60.Now, after the end of 6 such cycles, the resultant magnetic filed vector would have rotated 360 or one full rotation. This is known as the Rotating Magnetic Field.Now, According to Faraday's law of induction,An emf induced in any circuit is due to the rate of change of magnetic flux linkage through the circuit.As the rotor winding in an induction motor or AC motor are either closed through an external resistance or directly shorted by end ring, and cut the stator rotating magnetic field, an emf is induced in the rotor copper bar and due to this emf a current flows through the rotor conductor. Here the relative speed between the rotating flux and static rotor conductor is the cause of current generation.As per Lenz's law,The rotor will rotate in the same direction to reduce the cause i.e. the relative velocity.The rotor speed should not reach the synchronous speed produced by the stator. If the speeds equals, there would be no such relative speed, so no emf induced in the rotor, and no current would be flowing, and therefore no torque would be generated. Consequently the rotor can not reach the synchronous speed. The difference between the stator (synchronous speed) and rotor speeds is called the slip. The rotation of the magnetic field in an induction motor has the advantage that no electrical connections need to be made to the rotor.where Ns is the Synchronous speed and Nr is the Rotor speed.THANK YOU FOR READING.Ashutosh Sharma ( )How does an AC motor work?.
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