## How do I calculate my alternator rpm?

The number of poles is the sum of the north plus south poles. Speed(RPM) = Frequency(Hz) X 120 / Poles = 100 X 120 / 12 = 1000 RPM.

### How an alternator can be used to produce DC?

When the car is running, the alternator generates energy to feed the electrical system and charge the battery. When the alternator pulley is rotated, alternating current (AC) passes through a magnetic field and an electrical current is generated. This is then converted to DC via the rectifier.

#### At what speed does the alternator charge the battery?

Alternator charges the battery at a regulated 5 A/h. It charges at a much lower rate than specified on the batteries usually 1/10 of their capacity. This is because charging at full pin would overheat the battery, generate high levels of hydrogen gas and dramatically reduce the longevity of the battery.

How many revolutions of the alternator does it take to produce 1 Hz?

Two full sine waves are created in one complete mechanical revolution. If a two-pole alternator creates one cycle of voltage in one second (or one hertz of frequency), a four pole alternator will create two cycles of voltage in one second (or two hertz).

What is the minimum RPM of a 12V car alternator?

We can safely say, an economy car will idle around 750 rpm, a sports car around 1250 rpm and a race car around 2000 rpm. So the pulley ration between the crankshaft and alternator is kept at 3:1 for an economy car, 2:1 for a sports car and 1:1 for a race car. It can be anyways and it all depend upon the design we chose. But genera

## What’s the Max DC current for an alternator?

Click to expand… Actually field current controls output current, not output voltage. In a typical automotive alternator, the field resistance (measured at DC) is about 5 to 8Ω, so the max field current when connected to 12V is ~2A.

### When does an alternator need to be charged?

Alternator may not generate sufficient charging voltage until alternator speed is greater than about 2000 RPM. Typically, alternators have their full output rated at 6000 RPM but can continue to spin up to 12,000 RPM or more without any additional increase in output. Click to see full answer

#### What is the current gain of an alternator?

At a given RPM, the alternator acts as a current-controlled current-source; the output current is proportional to field current, so if you connect 12Vdc to the field, the field current will be about 2A, the output current will be about 50A, so the current gain is 50/2 = 25.

We can safely say, an economy car will idle around 750 rpm, a sports car around 1250 rpm and a race car around 2000 rpm. So the pulley ration between the crankshaft and alternator is kept at 3:1 for an economy car, 2:1 for a sports car and 1:1 for a race car. It can be anyways and it all depend upon the design we chose. But genera

What is the RPM of a normal 12V DC motor?

You mean using a 12v motor as a generator it will depend on the rpm on the motor when running as a motor if it runs at 10,000 rpm on 12 volts around .12 volts at 100 rpm not much use. If it is a 2,500 rpm motor 48 volts and if you gear up your 100 rpm with a 25 to 1 gear ratio you will get 12 volts.

Can a 12V generator run at 100 rpm?

If you wish to use this motor as a generator you will have to turn it faster than it runs as a motor to overcome the losses. You mean using a 12v motor as a generator it will depend on the rpm on the motor when running as a motor if it runs at 10,000 rpm on 12 volts around .12 volts at 100 rpm not much use.

## Can a car alternator generate 110V discussion thread?

This thread may give you some ideas. If the alternator is installed in a car, then the simple way to get 110VAC is with an inverter, which are available in many output levels. With these, the battery can be the power source, so the engine need not be running (but of course, you cannot run for long on the battery alone).