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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Disconnet the idler arm and it will give you more of an angle1. Is it bad for my car (perhaps starter motor?) to turn it off, doing something for one minute or less, then get back in and start it up again?you cars manual does suggest you leave your car running to run clock in your mechanic is running on the therory things are made to work so many times before it breaks he's explaining odds not your cars performance its true to a point but your starting motor should operate everytime you turn the key time has no bering2. Does the starter motor have a fuse on an Acura RSX?Take off starter and take it to a auto parts store they will test it for free, charge the battery or have some one jump you when you try to start it again. Also bleed your clutch. watch a youtube video of how to bleed a clutch for that model. Check the owners manual to see if and where the fuse is if necessary.3. what are the probable reasons for a burn out of a self starter motor in a car?Defective starter. Sounds like the starter solenoid froze up meaning that the starter was engaged while you were driving. That could be what you smelled4. i crank the key twice when the engine already started does it will damage the starter motor?Yeah, do not do that. It can not help any. Some engines run so quietly, they need a little light on the panel that lights when the engine is running5. new wiring in boat no power to starter motor any thoughts, there is power to the selinod?That would be the battery feed U need power from the Key switch to activate the solenoid.That should be the red/ Yellow wire if they used the correct wire.If a inboard6. I have to hit my starter motor with a wrench in order to start the car, what could be wrong in the starter???Not enough information. Does the starter motor not spin, or not engage? If it does nothing, the starter relay may be at fault7. 97 ranger with new starter, battery and solenoid only makes a clicking hoise. Will start easily by pushing.?I think Steven got it right- Clicking is the symptom of a bad connection somewhere between the battery, solenoid, and starter motor. Something in that chain is not doing its job, or the connection between them is interrupted somewhere. The last Ford I had, the solenoid was located on the firewall just behind the battery. I used to have to start the car with a screwdriver by shorting out the connection on 2 posts of the solenoid switch. Those were the days ('79)! :(8. how do i remove a starter motor that is stuck on?Either the starter motor is broken or there may be a problem with either the battery or the connections between the battery and the starter motor. First thing to do is turn on your head lights with the engine turned off, then try starting the engine. If the head lights go very dim then probably the battery is flat. Check the connections between the battery and the starter motor, make sure that all connections are clean and tight. Ja9. Using thermistor vs. soft starter for motorA VFD is a complex soft starter for Motors that limits acceleration and current and thus RPM rate of change with source frequency with constant V/F with high efficiency . A huge NTC must get hot to operate and thus start at reduced current. The amount of power determines the best method. There are many more examples.10. how to remove and install a starter motor on a grand marquis 93?you undo the electrical wires going into the starter but make sure you dosconnect the battery first and then should be two bolts that hold it up you take those out and the starter should come right out. and the starter is located at the rear of the engine near the tranny11. Starter motor clicks and wont turn when engageed on flywheel?Try to roll start it. It may be seized12. Can putting the car into "park" while it is still moving break the starter motor or do any other damage?Hi mate, No this has nothing to do with you putting it into park while moving as starter motors pack it in all the time. But you should not be putting it in park while moving as you can damage your transmission witch can leave you stranded! Cheers Matt
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